CN101142012A - Mixed fluid homogenizing device and mixed fluid supply apparatus - Google Patents

Abstract

A mixed fluid supply device (1) provided in a mixed state in which a mixed fluid is further homogenized is provided with a mixed gas pipe (4) for supplying an auxiliary gas to a main gas pipe and mixing the auxiliary gas, and a mixed fluid homogenizing device (6) disposed in the mixed gas pipe (4); the mixed fluid homogenizing device (6) is provided with a fixed perforated plate (8) and a movable perforated plate (9) which are overlapped and jointed with each other, and a driving cylinder (11) which is used for moving the movable perforated plate (9) relative to the fixed perforated plate in the in-plane direction; a plurality of through holes (10) are formed in each perforated plate (8, 9), and the degree of overlap between the through holes (10) of two perforated plates (8, 9) can be changed by the movement of the movable perforated plate (9), thereby changing the aperture ratio of all the through holes (10).

Description

Mixed fluid homogenizer and mixed fluid supply facility

technical field

The invention relates to a homogenizing device for a mixed fluid and a mixed fluid supply device. More specifically, it relates to a mixed fluid supply facility provided with such a mixed fluid homogenizing device for further uniformizing the degree of mixing of a mixed fluid obtained by mixing a plurality of fluids.

Background technique

In the field of ironmaking, for example, when pig iron is produced by the blast furnace method, blast furnace gas (Blast Furnace Gas; hereinafter referred to as BFG) is generated from the blast furnace as a by-product gas with relatively low calorific value (low calorific value). Such BFGs are used in various ways in ironworks. As a by-product gas with low calorific value, it is not limited to blast furnace gas, but also includes various gases such as converter gas (LDG) and coal bed gas (Coal mane gas; CMG) and their mixed gases. On the other hand, in recent years, new ironmaking processes other than the blast furnace method (such as direct reduction ironmaking methods such as FINEX and COREX) have been researched, and research and development of combustion methods that can be used to effectively utilize by-product gases generated by such new processes pending.

The characteristics (gas composition and calorific value) of the by-product gas generated in any ironmaking process are different depending on the equipment and operation content. Even if it is the same equipment, the characteristics will change from time to time according to the characteristics of each raw material and the reaction process. Not necessarily. When using this by-product gas as a fuel for combustion equipment such as a gas turbine, it is necessary to mix the gas for calorific value reduction so that the fluctuating calorific value does not exceed the upper limit of the allowable calorific value of the gas turbine, and to avoid combustion in the gas turbine combustor. A sharp rise in temperature. On the contrary, mix the gas for increasing the calorific value so that it is not lower than the lower limit of the allowable calorific value, and avoid flameout in the gas turbine combustor. In addition, the mixed gas obtained by mixing the calorific value increasing gas or the calorific reducing gas (hereinafter referred to as auxiliary gas) in the main gas (for example, BFG) must be uniformly distributed in the cross section of the fuel gas supply pipe. That is, it is necessary to mix thoroughly.

If the mixed gas is not uniform on the cross-section inside the piping, the uneven part may reach the burner of the gas turbine in its original state, so the combustion state may occur in each of the multiple burners installed in the combustion chamber. uneven.

Furthermore, when multiple types of combustible gases with different properties are used together as fuel for the purpose of not increasing or decreasing the calorific value (for example, mixing LDG and CMG with BFG), it is also necessary to mix these gases well.

Conventionally, in order to uniformly mix gases having different properties such as calorific value, a mixer including stator vanes that rotate the gas in a flow path has been used (see, for example, Patent Document 1). The function of the mixer is to realize the predetermined mixing of the main gas and the different gases that can be mixed with the main gas as the auxiliary gas in the entire range of calorific value and flow rate. The mixer is designed according to the mixing conditions. As its conditions, there are (1) the flow rate, gas specific gravity and gas composition of the main gas, (2) the specific gravity and gas composition of the gas to be mixed, (3) the main gas and the gas to be mixed The magnitude of the mixing ratio.

In existing mixers, the mixing ratio of the main gas and the auxiliary gas, that is, the mixing ratio, is predetermined based on the calorific value of the main gas and the auxiliary gas, and the originally scheduled auxiliary gas is changed to another type of gas for increasing the calorific value. In the case where the calorific value of the main gas changes and the mixing ratio of the main gas and the auxiliary gas has to be greatly changed, it is necessary to ensure the mixing on the cross section of the fuel supply pipe on the downstream side of the mixer. Uniformity within a certain tolerance is extremely difficult.

For example, if the auxiliary gas of 800kcal/Nm ³ increases the calorific value to 1000kcal/Nm ³ , coke oven gas (denoted as COG, calorific value of about 4000kcal/Nm ³ ), converter can be selected as the gas for increasing calorific value. In gas (referred to as LDG, calorific value is about 2000kcal/Nm ³ ), natural gas (represented as NG, calorific value is about 9000kcal/Nm ³ ), the mixing ratio of each with the main gas (the by-product gas) is different from each other. same. For example, if the ratio of the main gas BFG is expressed as 1, the mixing ratio of the auxiliary gas is 0.05 for COG, 0.1 for LDG, or 0.022 for NG. Therefore, when the supply of COG, which is a gas that increases the calorific value, is reduced, when LDG and NG are used as substitutes, the mixing ratio in the main gas is greatly different from that of COG, so the existing mixer designed exclusively for COG The effect of sufficient mixing cannot be obtained, and when LDG with a relatively low calorific value is used as the gas for increasing the calorific value as described above, it is mainly the case where the main gas is a gas with a lower calorific value such as BFG.

Even if the mixing ratio of the main gas and the auxiliary gas is the same, the flow pattern in the mixer will change due to the change of the flow rate of the main gas, so even if the mixed auxiliary gas is one, after mixing, ensure that the main gas has a large range of It is difficult to have specified uniformity over the range of flow variation.

Patent Document 1: Japanese Patent Application Laid-Open No. 10-337458

Contents of the invention

The present invention is made to solve the above-mentioned existing problems, and its purpose is to provide adaptation to various mixing conditions including different flow rates and compositions to improve the uniformity of mixing, regardless of whether a prior art mixer is provided (no relation to the mixer) , A mixed fluid homogenizing device for improving the uniformity of fluid mixing and a mixed fluid supply device equipped with the mixed fluid homogenizing device.

The homogenizing device for mixed fluid of the present invention is equipped with a plurality of perforated plates that are arranged in the fluid flow path and are overlapped and joined to each other and can be displaced relatively.

A plurality of through-holes are formed on each perforated plate, and the plurality of perforated plates are displaced relative to each other in a mutual surface direction in a state of overlapping each other, so as to change the overlapping degree of the through-holes of each perforated plate and change the thickness of all the through-holes. The structure of the aperture ratio.

With such a structure, the auxiliary fluid for adjusting the properties of the main fluid is mixed with the main fluid upstream of the perforated plate that forms a resistance to fluid flow, and is further mixed immediately after passing through the through holes to promote mixing. This promotes homogenization of the mixing. Furthermore, by changing the aperture ratio of the through-holes according to the mixing conditions, it is possible to select the most suitable aperture ratio for the mixing conditions.

It is also possible to form a structure as follows, that is, include a perforated plate moving device arranged outside the flow path to move the perforated plate, and the multi-piece perforated plate has a fixed perforated plate and a fixed perforated plate fixed inside the flow path. A movable perforated plate that is movable without being fixed forms a structure capable of reciprocating movement by means of the perforated plate moving device.

If constituted in this way, only one perforated plate needs to move, and the fixed perforated plate contributes to the guidance of the movable perforated plate.

Preferably, the opening area when the opening ratio of all the through holes is the maximum is equal to or greater than the cross-sectional area of the flow path. Because the resistance of the flow path can be reduced as much as possible.

The perforated plate may be arranged obliquely away from the vertical direction of the central axis of the flow path. In this case, the actual area of the perforated plate is increased, and the opening area formed by the entire through-hole is also increased, so that the resistance of the flow path can be reduced as much as possible.

A moving guide member is installed on the fixed perforated plate, and the movable guide member forms a structure that cooperates with the two side parts in the direction perpendicular to the reciprocating movement direction of the movable perforated plate, and can guide its movement.

The following structure can be formed, that is, a movable perforated plate is disposed between two fixed perforated plates, and a liner capable of maintaining a sliding gap between the two fixed perforated plates is arranged, The two fixed perforated plates and the liner have a structure that guides the movement of the movable perforated plate.

According to this configuration, the movement of the movable perforated plate is guided by the fixed perforated plates at the front and rear and the pads on both sides, for example, so the thickness and weight of the movable perforated plate can be reduced, enabling faster operation.

The through hole is formed in a long hole shape extending in a direction perpendicular to a moving direction of the movable perforated plate. By doing so, the area ratio of the through-holes on one perforated plate can be relatively large, so that the opening area when the through-holes are fully opened can be increased.

Preferably, a cleaning device for cleaning the through-hole is arranged in the flow path, and the cleaning device has a plurality of nozzles for ejecting a cleaning liquid. Because of this structure, the staff can clean the perforated plate without entering into the flow path, or greatly reducing the frequency of entering into the interior.

A structure may be formed in which all the through holes are closed by moving the movable perforated plate.

Another device for homogenizing a mixed fluid according to the present invention is provided with a perforated plate arranged in a fluid flow path and formed with a plurality of through holes, and the perforated plate forms an imaginary straight line that can surround the center of the perforated plate passing through the plane of the perforated plate. The structure can be rotated to any angular position.

With such a structure, the mixing of the mixed fluid can be further promoted. And even if the fluid flow on the downstream side of the flow path is suddenly cut off and the positively changing pressure fluctuation propagates to the upstream side, the rotatable perforated plate can be rotated to block the flow path to increase the flow rate. Because of the resistance of the road, it is possible to suppress the above-mentioned pressure fluctuation from propagating to the upstream side.

The perforated plate is configured to be rotatable between a fully open position in which the surface is along a direction along the central axis of the flow path, and a fully closed position in which the flow path is closed. In addition, the fully closed position that closes the flow path means a position where the flow of fluid in the flow path will be blocked if no through hole is formed in the perforated plate. It does not actually mean that fluid flow is completely cut off.

The mixed fluid supply device of the present invention is provided with a fluid flow path and a mixed fluid homogenizing device arranged in the flow path, and the mixed fluid homogenizing device is the mixed fluid described in any one of the above. For the homogenizing device, the cross-sectional area of the part of the flow path where the mixed fluid homogenizing device is arranged is larger than the cross-sectional area of the upstream side and the downstream side of the cross-sectional area respectively.

According to such a mixed fluid supply device, the actual area of the perforated plate increases, and the overall opening area of the formed through-holes also increases, so that the resistance of the flow path can be reduced as much as possible.

Another mixed fluid supply device of the present invention is provided with a fluid flow path and a mixed fluid homogenization device arranged in the flow path, and the mixed fluid homogenization device is described in any one of the above-mentioned In the homogenizing device for mixed fluid, the cross-sectional area on the downstream side of the part of the flow path where the mixed fluid homogenizing device is arranged is larger than the cross-sectional area on the upstream side.

By doing so, the mixed fluid expands and spreads immediately after passing through the homogenizing device, so further improvement of the mixing effect can be expected.

Another mixed fluid supply device of the present invention is provided with a fluid flow path and a mixed fluid homogenizing device arranged in the flow path, and the mixed fluid homogenizing device is described in any one of the above-mentioned The homogenization device for the mixed fluid further includes a gas property detection device for detecting the properties of the gas arranged on the downstream side of the mixed fluid homogenization device of the flow path, and the gas property detection device is formed to be able to detect the cross section of the flow path The structure of the distribution of gas components.

If such a mixed fluid supply device is used, the aperture ratio of the through holes of the above-mentioned perforated plate can be changed according to the mixed state of the mixed gas detected by the gas property detection device, so as to select an appropriate aperture ratio to improve the uniformity of the mixture. degree. As the gas property detection device, for example, a calorific value measuring device or the like is used.

According to the present invention, the uniformity of mixing can be improved under a wide range of mixing conditions, and the uniformity of fluid mixing can be improved even if the flow rate and composition of the main fluid and the auxiliary fluid to be mixed change.

Description of drawings

FIG. 1 is a piping diagram schematically showing a mixed fluid supply facility including a mixed fluid homogenizing device according to an embodiment of the present invention.

Fig. 2 is a longitudinal sectional view schematically showing an embodiment of a mixed fluid homogenizing device in the mixed fluid supply facility of Fig. 1 .

3( a ) is a front view schematically showing another embodiment of the mixed fluid homogenizing device in the mixed fluid supply facility of FIG. 1 , and FIG. 3( b ) is a side view in partial section thereof.

Fig. 4 is a perspective view showing still another embodiment of the mixed fluid homogenizing device in the mixed fluid supply facility of Fig. 1 .

Fig. 5 is a cross-sectional view taken along line V-V in Fig. 4 .

Fig. 6 is a longitudinal sectional view showing still another embodiment of the mixed fluid homogenizing device in the mixed fluid supply facility of Fig. 1 .

7( a ), ( b ), and ( c ) are cross-sectional views each showing a part of the perforated plate of the mixed fluid homogenizing device of FIG. 6 .

Fig. 8 is a perspective view of a perforated plate of the device for homogenizing mixed fluid in Fig. 6 .

Fig. 9 is a sectional view taken along line IX-IX of Fig. 8 .

Fig. 10 is a schematic longitudinal sectional view showing still another embodiment of the mixed fluid homogenizing device in the mixed fluid supply facility of Fig. 1 .

FIG. 11 is a perspective view showing a part of the mixed fluid homogenization device shown in FIG. 10 .

Fig. 12 is a cross-sectional view taken along line XII-XII in Fig. 10 .

Fig. 13 is a schematic longitudinal sectional view showing still another embodiment of the mixed fluid homogenizing device in the mixed fluid supply facility of Fig. 1 .

Fig. 14 is a schematic longitudinal sectional view showing still another embodiment of the mixed fluid homogenizing device in the mixed fluid supply facility of Fig. 1 .

Fig. 15 is a schematic longitudinal sectional view showing still another embodiment of the mixed fluid homogenizing device in the mixed fluid supply facility of Fig. 1 .

Fig. 16 is a perspective view showing an example of a perforated plate of the mixed fluid homogenizing device shown in Fig. 15 .

Fig. 17 is a perspective view showing another example of the perforated plate of the mixed fluid homogenizing device shown in Fig. 15 .

Symbol Description

1 mixed fluid supply equipment

2 main gas piping

3 Auxiliary gas piping

4 Mixed gas piping

5 mixing points

6 (mixed fluid) homogenization device

7 Uniformity detection device

8 Fixed perforated plate

9 moving perforated plate

10 through hole

11 driving cylinder

12 connecting rod

13 sealing mechanism

14 guide member

15 pads

16 (mixed fluid) homogenization device

17 cleaning device

18 Cleaning liquid supply pipe

19 nozzles

20 through holes

21 Mixed gas piping

22 rotating perforated plate

23 Piping

24 rotating perforated plate

25 axis of rotation

26 (mixed fluid) homogenization device

27 Flange joints

28 closed bushing (plug)

29 On-off valve

30 control device

31 Oil volume adjustment device

32 position detector

33 Liquid sump

34 leaks

C Combustion device

S gas supply source

Detailed ways

Next, an embodiment of a mixed fluid homogenizing device and a mixed fluid supply facility including the same according to the present invention will be described with reference to the drawings.

Fig. 1 is a mixed fluid supply device 1 according to an embodiment of the present invention. As such a supply facility, when using, for example, a by-product gas with fluctuating calorific value generated by a gas supply source S such as a blast furnace or a direct reduction ironmaking facility, as a fuel gas for a gas turbine, there are, for example, various types of by-product gas with different properties. Fuel gas supply equipment supplied after mixing, or fuel gas supply equipment that mixes inert gas as a calorific value reducing gas, or COG as a calorific value increasing gas with these fuel gases. The above-mentioned gas supply source S passes through necessary processing steps including supplying generated gas as fuel, for example, a dust removal step. The fluid supplied by such a mixed fluid supply device of the present invention is not limited to gas, and includes liquid, powder, slurry, etc., but only gas is exemplified in the embodiments described below.

This mixed fluid supply device 1 is provided with: a main gas pipe 2 for supplying the main gas generated by the gas supply source S, and a gas connected to the main gas pipe 2 to add the gas for reducing the calorific value or the gas for increasing the calorific value to the main gas. The auxiliary gas piping 3 for mixing in the middle, and the mixed gas piping for supplying the mixed gas of the main gas and the auxiliary gas, which are arranged on the downstream side of the connection point (hereinafter also referred to as the mixing point) 5 of these two pipings 2 and 3 4. And a mixed fluid homogenizing device (hereinafter referred to as a homogenizing device) 6 arranged in the mixed gas piping 4 . The above-mentioned assist gas piping 3 is a pipe for supplying assist gas in order to stabilize the fluctuating properties (for example, calorific value fluctuation) of the main gas.

The gas uniformly mixed by the homogenizing device 6 is sent to a combustion device C such as a combustion facility of a gas turbine when the gas is a fuel gas. The pipes 2 , 3 , and 4 described above are not limited to pipes with a circular cross-section, but may be pipes with an elliptical cross-section or pipes with a polygonal cross-section. The above-mentioned auxiliary gas piping 3 may be a piping in which two or more auxiliary gases are supplied and mixed at the same mixing point 5, or may be a piping in which a plurality of different auxiliary gas piping are connected to the main gas piping 2 at different positions. .

As shown in the figure, a uniformity detecting device 7 for detecting the mixing uniformity of the mixed gas flowing inside may be provided on the downstream side of the homogenizing device 6 of the mixed gas piping 4 .

FIG. 2 shows the homogenization device 6 described above. The homogenizing device 6 includes two perforated plates 8 and 9 . A plurality of through holes 10 are formed in each of the perforated plates 8 and 9 . The diameter and arrangement pitch of the through-holes 10 are not limited, but it is preferable to form them with the same diameter and the same pitch because adjustment of the aperture ratio described below will be relatively easy. A perforated plate 8 has a shape extending to the entire flow path of the mixed gas pipe 4 (if there is no through hole, the shape will block the flow path in the entire pipe), and its outer periphery is fixed to the inner surface of the mixed gas pipe 4 superior. This perforated plate 8 is referred to as a fixed perforated plate 8 . The fixed perforated plate 8 is formed in a shape corresponding to the cross-sectional shape of the flow path of the mixed gas pipe 4 . Another perforated plate 9 is connected to the upstream surface of the fixed perforated plate 8, and has a structure capable of reciprocating in the direction of the surface. This perforated plate 9 is called a movable perforated plate 9 .

A perforated plate moving device constituted by a drive cylinder 11 such as a hydraulic cylinder arranged outside the mixed gas piping 4 is connected to an end portion of the movable perforated plate 9 . The movable perforated plate 9 reciprocates by means of this drive cylinder 11 . A portion connecting the piston rod 11 a of the drive cylinder 11 and the connecting rod 12 of the movable perforated plate 9 penetrates the mixed gas pipe 4 . A sealing mechanism 13 is provided on a portion of the pipe 4 through which the connecting rod 12 penetrates. The position of the movable perforated plate 9 is not limited to the upstream side of the fixed perforated plate 8, and may be arranged on the downstream side. Furthermore, the perforated plate moving device is not limited to a hydraulic cylinder, and an electric motor or the like may also be used.

Furthermore, the position of the drive cylinder 11 is not limited to the lower part of the gas mixture pipe 4 as shown in the figure, but may be arranged above it, and the movable perforated plate 9 is suspended to move up and down. Furthermore, it may be arranged on the side of the mixed gas pipe 4, and the movable perforated plate 9 may be reciprocated in the horizontal direction, or it may be arranged at any position between the upper side and the lower side.

In addition, a portion of the mixed gas piping 4 in which the homogenizing device 6 is incorporated may be configured to be detachable from the mixed gas piping 4 . For example, the front and rear of the homogenizing device 6 of the mixed gas piping 4 may be cut off, and this part may be connected to the front and rear mixed gas piping 4 by pipe joints such as flanges. In this way, the connecting screw of the flange can be removed, and the pipe of the part containing the homogenizing device 6 can be moved outward together with the drive cylinder 11 and the like. In this way, it is easy to perform maintenance on the homogenizing device 6 when the equipment is periodically inspected or the like.

In each of the perforated plates 8 , 9 , the distance between the centers of the through holes 10 is formed larger than the diameter of the through holes 10 . In this way, the movable perforated plate 8 can reciprocate over a predetermined distance and stop at any position therebetween. By means of this, it is possible to set all the through holes 10 of the two perforated plates 8, 9 to be consistent with each other. The through holes 10 are closed at any position (arbitrary opening ratio) between the fully open position where the aperture ratio is 100%, and all the through holes 10 are closed without overlapping, and the fully closed position where the aperture ratio is 0%. This point will be clear with reference to FIG. 7( a ) and FIG. 7( c ), which show a homogenizing device 16 having three perforated plates. In this way, in order to enable the movable perforated plate 9 to move only a predetermined distance, the profile of the movable perforated plate 9 is made smaller than that of the fixed perforated plate 8, and the configurations of the through holes 10 of the two perforated plates 8, 9 are distributed in the same position. position.

The state of the maximum aperture ratio is not particularly limited to the state in which the entire area of the through-hole 10 is opened to an aperture ratio of 100%. For example, a state where the entire area of the through hole is less than 100% may be regarded as the maximum opening state. Furthermore, the minimum opening state is not particularly limited to the state in which the entire area of the through hole 10 is closed and the opening ratio is 0%. For example, a state of more than 0% of the entire area of the through hole (slightly opened state) may be regarded as the minimum opening state. If set in this way, the distance between the centers of the through-holes 10 need not be made larger than the diameter of the through-holes 10 as described above.

The purpose of changing the opening ratio of the perforated plates 8 and 9 as described above is to enable optimum mixing under the mixing conditions while changing the opening ratio according to the mixing conditions of the main gas and the auxiliary gas. Part of the mixed gas sent through the mixed gas pipe 4 is temporarily blocked by the perforated plates 8 and 9, and the gas flow component in the direction perpendicular to the central axis of the pipe is output. Due to this effect, the mixed gas is more thoroughly mixed. The mixed gas passing through the perforated plates 8 and 9 generates a diffusion vortex due to the action of the gas injected downstream from the through holes 10, and the mixing of the gas becomes more uniform. By means of such a mechanism, the mixing of the mixed gas is further homogenized.

As the uniformity detection device 7 provided downstream of the homogenization device 6 as described above, a calorific value detection device that detects gas calorific value distribution on the cross-section of the gas flow path in the mixed gas piping 4 may be used. For this purpose, the plurality of detection parts 7a of the calorific value detection device 7 should be arranged substantially evenly on the cross-section of the flow path. The arrangement of the detection part 7a is not limited to one cross section, and may be arranged on a plurality of cross sections as shown in the figure.

Here, as the calorific value detection device 7, a so-called calorimeter which directly measures the calorific value of gas, a device which measures the content rate (concentration) of a combustible component, etc. can be used. In the case where detection speed is important, it is currently preferable to use a combustible gas concentration detector (gas component detection device). It is also possible to use a concentration detector that detects the concentration of the combustible component mainly contained in the low-calorific gas used and the combustible component whose main concentration fluctuates (for example, carbon monoxide in the by-product gas of the direct reduction ironmaking method). . As the uniformity detection device, use is not limited to a calorific value detection device. Various devices may be used as long as they are suitable devices for detecting the properties of the gas, such as a density detection device for detecting the specific gravity distribution of the gas in the cross-section of the gas flow path.

The aperture ratios of the through-holes 10 of the perforated plates 8 and 9 can be changed according to the mixed state of the mixed gas detected by the calorific value detecting device 7, and an aperture ratio suitable for improving the uniformity of mixing can be selected. A control device 30 for realizing such an appropriate opening ratio, an oil quantity adjusting device 31 for adjusting the stroke of the piston rod 11a by adjusting the oil quantity of the working oil supplied to the above-mentioned drive cylinder 11, and detecting the expansion and contraction of the piston rod 11a are provided. A position detector 32 for the position.

The control device 30 stores a relationship table with the type of auxiliary gas as a parameter, indicating the mixing ratio of the auxiliary gas (the volume ratio of the auxiliary gas to the main gas) and the corresponding optimal opening ratio of the perforated plate. Furthermore, the position of the detected portion of the piston rod 11a from the fully open position of the movable perforated plate 8 to the fully closed position is stored. It also stores the oil supply amount of working oil required for the perforated plate to move between the fully open position and the fully closed position.

The control device 30 selects the gas for reducing the calorific value according to the requirement that the measured calorific value of the main gas does not exceed the allowable upper limit of the combustion device, and at the same time calculates the required mixing amount and sends it to the auxiliary gas supply device (not shown). instruction. And the control device 30 calculates the required mixing amount while selecting the gas for increasing the calorific value according to the requirement that the measured calorific value of the main gas is not lower than the allowable lower limit value, and issues instructions to the auxiliary gas supply device. When there are multiple types of gas for increasing the calorific value and gas for reducing the calorific value, an appropriate gas is selected based on a predetermined standard, and the required mixing amount of the gas is calculated.

Then, read the target aperture ratio of the perforated plate corresponding to the mixing amount of the auxiliary gas in the main gas from the table, calculate the movement amount of the movable perforated plate 9 according to the value, and control the corresponding hydraulic cylinder. The amount of oil supplied to achieve the target opening ratio of the perforated plate. For example, when the mixing ratio of the assist gas is small, the aperture ratio is made small. The cycle for measuring the deviation between the calorific value of the mixed gas and the target calorific value is preferably set to be longer than the calorific value detection time.

When the uniformity of the mixed gas is measured by the uniformity detection device 7 on the downstream side of the homogenization device 6, the detection value may be fed back and controlled. In this case, due to the frequent adjustment of the movable perforated plate, sometimes the system may be unstable. In this case, the uniformity detection device 7 can also be used mainly as a means for monitoring the uniformity.

A portion of the mixed gas piping 4 in which the uniformity detection device 7 is built can also be configured to be detachable from the mixed gas piping 4 . This is the same as the attachment and detachment mechanism of the homogenization device 6 described above, and can be realized by using pipe joints such as flanges. This makes it easy to perform maintenance and calibration of the uniformity detection device 7 .

The shape of the through hole 10 is not limited to a perfect circle, and may be an ellipse, a polygon including a square and a rectangle, and the like. The long through hole 20 shown in FIG. 3 may also be used. The long through-holes 20 extend in a direction perpendicular to the moving direction of the movable perforated plate 9 , and are formed at intervals in the moving direction of the movable perforated plate 9 . The intervals of the through-holes 20 are preferably equal intervals. In FIG. 3( a ), only the through holes 20 of the movable perforated plate 9 can be seen, but of course a plurality of through holes of the same size and shape are similarly arranged on the fixed perforated plate 8 . When the through-hole 20 is formed on a perforated plate with the same area, the opening area of the through-hole 10 is larger than that of the above-mentioned many small circular or square through-holes 10 when fully opened. In this regard, the through-hole 20 is ideal. of.

If the mixed gas pipe 4 has a constant pipe inner diameter along its length direction, even if the opening ratio of the perforated plates 8 and 9 is set to 100%, the opening area there is smaller than the cross section of the flow path of the mixed gas pipe 4. The area is small. However, it is ideal to make the opening area of the perforated plates 8 and 9 as large as possible in the fully open state to reduce the pressure loss. For this reason, as shown in FIG. 2 , the portion of the mixed gas piping 4 where the homogenizing device 6 is installed has a cross-sectional area of the flow path larger than that of the upstream and downstream portions. That is, the mixed gas piping 4 of this embodiment is a piping with a circular cross-section, and therefore its pipe diameter is enlarged. As a result, the actual area of the perforated plates 8, 9 becomes large. As it becomes larger, the opening area of the entire perforated plates 8 and 9 at the time of full opening becomes larger, and can be made equal to or larger than the cross-sectional area of the flow path of the mixed gas piping 4 on the upstream side and downstream side. area.

In the above-mentioned embodiment, the portion of the mixed gas piping 4 having an enlarged diameter has the same diameter before and after the homogenizing device 6, but the configuration is not limited to this. Alternatively, the pipe diameter of the part immediately behind (downstream side) of the homogenizing device 6 may be larger than that of the part immediately before the device (upstream side). If so, since the mixed gas expands and diffuses just after passing through the homogenizing device 6, the mixing effect can be expected to be further improved.

As shown in FIG. 2, the opening area can be further increased by forming the perforated plates 8 and 9 in a shape capable of being inclined with respect to the vertical plane of the central axis of the mixed gas pipe 4. The number of through-holes 10 formed can also be increased by increasing the actual area of the perforated plate by forming the perforated plate in a shape (ellipse) capable of filling the flow path of the mixed gas pipe 4 in an inclined state. For example, in the case of forming through-holes 10 of the same size and shape at the same pitch, if the perforated plates 8, 9 are inclined at an angle θ with respect to the plane perpendicular to the central axis of the mixed gas piping 4, the actual area of the perforated plates is 1/cosθ times, so the number of through-holes 10 is approximately 1/cosθ times, and the overall opening area is also the same.

In this case, the direction of the through-hole 10 relative to the perforated plate 8, 9, as shown in FIG. , so it is ideal. However, in this case, since the holes are perforated in a direction inclined to the vertical direction of the perforated plate surface, the processing cost increases. Therefore, in consideration of reducing the processing cost, it is also possible to perforate in a direction perpendicular to the surfaces of the perforated plates 8 and 9 .

As shown in FIGS. 4 and 5 , a guide member 14 for moving the movable perforated plate 9 is installed on the fixed perforated plate 8 . The guide members 14 are L-shaped cross-sectional members provided on both sides (both ends in the moving direction of the movable perforated plate 9 ) of the movable perforated plate 9 side of the fixed perforated plate 8 . The two sides of the movable perforated plate 9 are stuck between the guide member 14 and the fixed perforated plate 8 so as to guide its sliding. In addition, the fixed perforated plate 8 and the movable perforated plate 9 in FIG. 4 show a state in which their surfaces are arranged vertically, that is, a state in which they are arranged perpendicular to the central axis of the mixed gas pipe 4 .

Also, in the homogenizing device shown in FIG. 4 , the drive cylinder 11 is connected to the upper portion of the movable perforated plate 9 , and the movable perforated plate 9 has a structure that can move while being suspended from the drive cylinder 11 . 4 shows the details of the connecting portion between the piston rod 11a of the drive cylinder 11 and the movable perforated plate 9. As shown in FIG. The connecting rod 12 is fixed to the movable perforated plate 9 . The connecting rod 12 is connected to the piston rod 11a with a pin. This is only an example and does not exclude other linking mechanisms. In FIG. 4 , illustration of the sealing mechanism 13 is omitted.

6 to 9 show a homogenizing device 16 composed of three perforated plates. In this homogenizing device 16 , one movable perforated plate 9 is slidably arranged between two fixed perforated plates 8 arranged in parallel with a space maintained by spacers 15 . The two fixed perforated plates 8 maintain an interval approximately the same as the thickness of the movable perforated plate 9 . The through-holes 10 of the three perforated plates 8 and 9 are the same as those described above, and are formed in the same size, shape, and arrangement. The two fixed perforated plates 8 can also be as shown in the figure, and the through holes 10 thereof are arranged opposite to each other one by one. In this way, if the movable perforated plate 9 moves as shown in Figure 7 (a), and the homogenizing device 16 is in the fully open position, the through holes 10 of the movable perforated plate 9 are also aligned with the through holes of the two fixed perforated plates 8. 10, the opening ratio of the through hole 10 is 100%. Also, when the movable perforated plate 9 is moved from the fully open position by the distance d of the diameter d of the through holes 10, all the through holes 10 are fully closed ( FIG. 7( c )), and the opening ratio is 0%. Figure 7(b) shows the state of the intermediate aperture ratio.

As shown in FIGS. 8 and 9 , the pads 15 are arranged on both sides of the middle of the two fixed perforated plates 9 , and the distance between the pads 15 is roughly equal to the width of the movable perforated plate 9 . With such a structure, the spacer 15 and the two fixed perforated plates 8 function as guide members for the movable perforated plate 9 .

Also, since the movable perforated plate 9 is supported by two fixed perforated plates 8 on both sides thereof, there is no need to worry about deflection, so the plate thickness can be made thin. As a result, the weight of the perforated plate can be reduced, the drive mechanism can be simplified, and the setting accuracy of the aperture ratio can be improved.

The arrangement of the through-holes is not limited to the chessboard-like arrangement ( FIGS. 4 and 8 ) and the up-and-down multistage arrangement ( FIG. 3 ) as described above. For example, through-holes arranged on a plurality of imaginary circles concentrically and equally spaced may be used. In this case, it is only necessary to form a structure capable of rotating the movable perforated plate 8 around the center of an imaginary circle. Therefore, the through-holes are arranged at equal intervals on each virtual circle, and the closer to the center of the virtual circle, the smaller the arrangement interval of the through-holes is.

10 to 12 show a homogenizing device 26 provided with a cleaning device 17 for cleaning the surfaces between the perforated plates 8 and 9 and the through holes of both perforated plates 8 and 9 on the downstream side of the perforated plates 8 and 9 . The cleaning device 17 of the present embodiment includes a plurality of cleaning liquid supply pipes 18 extending substantially horizontally with vertical intervals substantially facing the downstream side surface of the movable perforated plate 9 . A plurality of nozzles 19 are arranged at intervals on each cleaning liquid supply pipe 18 . As shown in FIG. 11 , the cleaning liquid supply pipe 18 is branched from one branch pipe into multiple branches. Each branch pipe 18 is attached to the other mixing pipe 4 with a flange joint 27 , and its downstream end is closed with a plug 28 . An on-off valve 29 is provided on the upstream side of the cleaning liquid supply pipe 18 . The on-off valve 29 may be configured to be automatically and intermittently opened and closed while the supply of the mixed fluid is stopped. Illustration of the guide member 14 and the drive cylinder 11 in FIG. 11 is omitted.

Considering the cleaning effect, the number of the nozzles 19 is preferably the same as that of the through-holes 10 , and they are arranged in one-to-one correspondence with the through-holes 10 . However, it is not limited to such a structure. For example, the nozzles may be arranged so that the cleaning liquid can be sprayed over a relatively wide range from each nozzle 19 and the cleaning liquid can be sprayed into many through holes including the through hole 10 at the uppermost position. Even if the cleaning liquid flows downward on the perforated plates 8 and 9, the cleaning effect can be exerted. Furthermore, the plurality of cleaning liquid supply pipes 18 can be rotated around the central axis, so that the direction of the nozzle 19 can be easily changed in the vertical direction. Furthermore, an inspection window may be provided on the mixed gas piping 4 so that the cleaning device 17 and the perforated plates 8 and 9 can be visually confirmed. As a result of confirming the cleaning state in this way, the cleaning liquid supply pipe 18 can be rotated to change the direction of the nozzle 19 as necessary, and the spraying angle of the cleaning liquid can be adjusted to an optimum angle.

Moreover, the number of spray nozzles 19 provided is not limited, and one nozzle capable of spraying the cleaning liquid over a wide range may also be used. In this case, only one cleaning liquid supply pipe 18 is provided. A sump 33 for collecting the cleaned cleaning liquid is formed at the bottom of the mixed gas pipe 4 near the cleaning device 17, and a leak hole 34 for draining may be formed at the bottom of the sump 33.

The installation position of the cleaning device 17 is not limited to the downstream side of the perforated plates 8 and 9, but may be upstream, or may be installed on both the upstream side and the downstream side. The perforated plates 8 and 9 shown in the figure are erected vertically, but when the perforated plates 8 and 9 are installed obliquely as shown in FIGS. (Perforated plate right in Figure 2 and Figure 6). This improves the cleaning effect because the sprayed cleaning liquid flows over the face of the perforated plate and falls as compared to the case where it is provided on the lower surface side.

With the above-mentioned cleaning device 17, it is possible to prevent, for example, dust and the like from adhering to the perforated plate or its through-holes to increase flow resistance or to prevent so-called sticking of the perforated plate. In this way, when the operation of the mixed fluid supply device 1 is stopped, the operator does not need to enter the pipeline for cleaning the homogenizing device 6 or the number of times of entering the pipeline is greatly reduced.

The portion of the mixed gas piping 4 in which the cleaning device 17 is installed can also be configured to be detachable from other parts of the mixed gas piping 4 by using pipe joints such as flanges as described above. This makes maintenance of the cleaning device 17 easier.

FIG. 13 shows another form of mixed gas piping 21 . In the mixed gas pipe 21, the ends of the two branch pipes 21a and 21b extending in parallel are connected by a right-angled short pipe 21c. This configuration is to sufficiently enlarge the flow path area of the mixed gas piping 21c of the homogenizing device 6 with a simple structure. Moreover, the two branch pipes 21a, 21b may be arranged in parallel in the lateral direction, but in the case of being arranged in parallel up and down as shown in the figure, the above-mentioned short pipe 21c extends in the up and down direction, and the planes of the perforated plates 8, 9 are arranged approximately in parallel, so is ideal. In this way, the movable perforated plate 9 can be arranged in a state where it is placed on the upper surface of the fixed perforated plate 8 , so the movement of the movable perforated plate 9 is stabilized. And the mixed gas piping 21 is not limited to the state that the flow of the mixed fluid is upward from the bottom of the homogenizing device 6 as shown in the figure, and the upstream side piping 21a of the homogenizing device 6 may be arranged above the downstream side piping 21b, and the mixed fluid flows from the homogenizing device 6 to the top of the downstream side piping 21b. The top of the chemical device 6 flows downward.

And it is not possible to connect the two branch pipes 21a, 21b with the short pipe 21c perpendicular to it as described above, but also as shown in Figure 14, the two branch pipes 21a, 21b use the inclined short pipe 21d, that is, in the direction relative to the two branch pipes. The short pipe 21d extending in the direction in which the center axis|shaft of branch pipe 21a, 21b forms an obtuse angle is connected. Using such a method, not only the pressure loss of the pipeline is reduced, but because the perforated plates 8, 9 are arranged obliquely with respect to the central axis of the inclined short pipe 21d, the actual area of the perforated plates 8, 9 increases relative to the cross-sectional area of the pipeline, The resistance produced by the perforated plates 8, 9 has decreased.

The above-described homogenizing devices 6 and 16 have an excellent function other than homogenizing the mixed gas, and this function is exhibited by being installed on a piping for supplying fuel gas to, for example, a gas turbine. When the above-mentioned combustion device is stopped in an emergency, an emergency stop valve provided on the fuel gas supply pipe for instantaneously stopping the supply of the fuel gas is closed. In this way, a sudden change in pressure propagates to the upstream side of the fuel gas supply pipe due to a sudden change in the kinetic energy of the fuel gas flow. At this time, the above-mentioned pressure propagation can be suppressed or stopped by promptly reducing the opening ratio of the homogenizing devices 6 and 16 sharply or making it zero. As a result, a buffer tank and a discharge tower for discharging to the atmosphere can be eliminated, or at least reduced in capacity.

15 to 17 show another embodiment using a perforated plate in order to suppress and prevent such a sudden pressure change from the downstream side of the pipe to the upstream side. The perforated plate 22 is rotated. The pipe 23 shown in FIG. 15 is a pipe with a circular cross section, so the rotating perforated plate is circular as shown in FIG. 16 . Of course, it is not limited to a circular shape. For example, a square rotary perforated plate 24 shown in FIG. However, it is not necessary to form the same shape as a cross section cut along a plane perpendicular to the central axis of the pipe. The same shape as a cross-sectional shape inclined back and forth from a plane perpendicular to the central axis of the piping may be used. Furthermore, as shown in the figure, in order to increase the opening area of all the through holes 10, the diameter of the pipe 23 may be increased in the portion where the rotary perforated plate 22 is installed. The shape of the through hole 10 is the same as that of the above-mentioned homogenizing devices 6 and 16, and is not limited to a perfect circle, but may also be an ellipse, a polygon including a square or a rectangle, and the like.

On both side ends of the rotary perforated plate 22 formed in this way, a rotary shaft 25 extending in the lateral direction through the centers of the rotary perforated plates 22 and 24 protrudes through the piping. The rotating shaft 25 is connected to a not-shown rotational drive device provided outside the pipe 23 . The rotary driving device may employ, for example, an electric motor, a hydraulic cylinder, or the like. The rotary shaft 25 is driven to rotate by the rotary driving device, so that the flow paths of the rotating perforated plates 22 and 24 in the piping are expanded to the maximum position (as shown by the solid line in FIG. , that is, the so-called fully closed position) and its surface along the direction of the central axis of the pipe (the position shown by the 2-point lock line in Figure 15, that is, the so-called fully open position). Furthermore, it is also possible to form a structure capable of stopping at an arbitrary angular position between these two positions.

In the embodiments shown in FIGS. 15 to 17 , the rotary perforated plates 22 and 24 are configured to be rotatable around a horizontal axis, but the present invention is not limited thereto. For example, it can rotate around a vertical axis, or around any rotation axis between horizontal and vertical. Furthermore, a rotational position detection device for detecting the stop positions of the rotary perforated plates 22 and 24 may be provided to confirm whether the rotary perforated plates are stopped at an appropriate position.

Such rotating perforated plates 22, 24 are fully open during normal operation of the above-mentioned combustion device, so that the fuel gas flow is not subject to great resistance. However, when the emergency stop valve downstream of the piping 23 is closed and a sudden pressure change is to be propagated upstream, the rotary perforated plates 22 and 24 are suddenly turned to the fully closed position, so the flow path of the fluid is finally only through the rotary perforated plate. The hole 10, so the flow path resistance inside the pipe 23 increases sharply, the pressure fluctuation is attenuated, and its propagation is suppressed.

The rotary perforated plates 22 and 24 can also be used as a mixing and homogenizing device for mixed fluids in addition to this purpose.

In the embodiments described above, the gas turbine was used as an example of the combustion facility, but the application of the present invention is not particularly limited to the gas turbine. As combustion equipment, internal combustion engines such as thermal boilers, diesel engines, and gas engines may also be used. In other words, the present invention can be applied to combustion equipment in which combustion can be maintained as long as the input calorific value fluctuates within a certain range.

Industrial applicability

According to the device for homogenizing the mixed fluid of the present invention, the mixing uniformity of the supplied fluid can be improved irrespective of whether an existing mixer is provided. In addition, although gas is used as an example of the homogenizing device, it is not limited to such gas. Can also be used in fluid supply equipment. Furthermore, it can also be used in supply equipment for powder, slurry, etc.

Claims (14)

1. A homogenizing device for mixed fluid, characterized in that, Equipped with multiple perforated plates that are arranged in the fluid flow path and overlapped with each other, and can be displaced relative to each other. A plurality of through holes are formed on each perforated plate, and the plurality of perforated plates are displaced relative to each other in the direction of the mutual surface in the state of overlapping each other, so as to change the overlapping degree of the through holes of each perforated plate and change the overall through hole. The structure of the hole opening ratio. 2. The homogenizing device of mixed fluid according to claim 1, characterized in that, including a perforated plate moving device arranged outside the flow path for moving the perforated plate, The plurality of perforated plates include a fixed perforated plate fixed inside the flow path and a movable perforated plate that can be moved without being fixed. The movable perforated plate forms a structure that can be reciprocated by means of the perforated plate moving device. 3 . The device for homogenizing mixed fluid according to claim 1 , wherein the opening area when the opening ratio of all the through holes is at a maximum is the same as or larger than the cross-sectional area of the flow path. 4 . 4 . The homogenizing device for mixed fluid according to claim 1 , wherein the perforated plate is arranged obliquely away from the vertical direction of the central axis of the flow path. 5. The homogenizing device for mixed fluid according to claim 2, characterized in that, a moving guide member is installed on the fixed perforated plate, and the moving guide member forms a direction perpendicular to the reciprocating movement direction of the movable perforated plate. The parts on both sides cooperate to guide its movement. 6. The homogenizing device for mixed fluid according to claim 1, characterized in that, a movable perforated plate is disposed between two fixed perforated plates, and a movable perforated plate can be kept between the two fixed perforated plates. A liner for the gap where the perforated plate can slide, The two fixed perforated plates and the liner have the function of guiding the movement of the movable perforated plate. 7 . The homogenizing device for mixed fluid according to claim 1 , wherein the through hole is formed in the shape of a long hole extending in a direction perpendicular to the moving direction of the movable perforated plate. 8 . 8. The homogenizing device for mixed fluid according to claim 1, further comprising a cleaning device disposed in the flow path for cleaning the through hole, the cleaning device has a cleaning device for spraying and cleaning. multiple nozzles for liquid. 9 . The homogenizing device for mixed fluid according to claim 1 , wherein all the through holes can be closed by moving the movable perforated plate. 10. A homogenization device for mixed fluid, characterized in that, A perforated plate with a plurality of through-holes arranged in the fluid flow path is provided, The perforated plate forms a structure capable of rotating to any angular position around an imaginary straight line passing through the center of the perforated plate within the plane of the perforated plate. 11. The homogenizing device for mixed fluid according to claim 10, wherein the perforated plate is formed to be fully open on its surface along the direction of the central axis of the flow path and fully closed to close the flow path. A structure that rotates between positions. 12. A mixed fluid supply device, characterized in that, A flow path for fluid flow, and a mixed fluid homogenizing device arranged in the flow path, The mixed fluid homogenizing device is the mixed fluid homogenizing device described in any one of claims 1 to 11, The cross-sectional area of the portion of the flow path where the device for homogenizing the mixed fluid is arranged is larger than the cross-sectional area of the upstream side and the downstream side of the cross-sectional area respectively. 13. A mixed fluid supply device, characterized in that, A flow path for fluid flow, and a mixed fluid homogenizing device arranged in the flow path, The mixed fluid homogenizing device is the mixed fluid homogenizing device described in any one of claims 1 to 11, The cross-sectional area on the downstream side of the portion of the flow path where the mixed fluid homogenizing device is disposed is larger than the cross-sectional area on the upstream side. 14. A mixed fluid supply device, characterized in that, A flow path for fluid flow, and a mixed fluid homogenizing device arranged in the flow path, The homogenization device for the mixed fluid is the homogenization device for the mixed fluid described in any one of claims 1 to 11, It also includes a gas property detection device for detecting properties of the gas disposed downstream of the mixed fluid homogenizing device in the flow path, and the gas property detection device is configured to detect the distribution of gas components on the cross section of the flow path.

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