JPH10170059A - Device for applying countermeasure against deflected flow at bent duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict an occurrence of deflected flow of discharged gas at a corner part of a bent duct by a simple configuration, perform an injection of lime water in correspondence with a deviation of flow rate of discharged gas caused by the deflected flow and correct an unbalanced state of gas-liquid contact between discharged gas and lime water. SOLUTION: This device is constructed such that a cylindrical column-like deflected flow reducing device (a round bar 4) is arranged at a location of downstream side of a bent section 2a of a bent duct 2 and at the same time a partition plate 22 is arranged at a bottom surface of the duct in a front flow side of the bent section 2a of the bent duct 2. Each of a front flow side and a rear flow side of the deflected flow reducing round bar 4 applied at a discharged smoke desulfuriziation device in order to reduce the deflected flow of the discharged gas is provided with a pressure measuring opening hole. An injection amount of lime water injected from a spray nozzle is controlled in response to a flow speed calculated in response to a pressure (a dynamic pressure) at each of the pressure measuring holes. With such an arrangement as above, the most suitable amount of injection of lime water is adjusted in such a way that a gas-liquid contact between the discharged gas and the lime water (adsorption liquid) may become most suitable amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing drifting of a fluid machine having a bent duct (for example, a flue gas desulfurization device).

[0002]

2. Description of the Related Art A flue gas desulfurization apparatus utilizing gas-liquid contact will be described as an example of a fluid machine having a bent duct. The flue gas desulfurization device is an environmental device that removes sulfurous acid gas generated due to combustion of fuel used in the boiler (combustion of fossil fuel). This device is often arranged in a narrow space due to space-saving of thermal power plant equipment and restrictions on location, so that the duct shape of the device is complicated. A duct with a complicated shape refers to a bent duct, a duct that expands or turns 180 °, etc., and the exhaust gas flowing in the duct tends to flow to only one side of the duct, that is, a so-called drift is likely to occur. This is the actual situation. In the flue gas desulfurization device, when a drift occurs in the flow of the exhaust gas, the contact area between the adsorbent (lime water) and the exhaust gas is reduced, and the desulfurization efficiency is greatly reduced.

FIGS. 7 to 9 show the structure of a conventional flue gas desulfurization apparatus 300. In these figures, reference numeral 1 denotes an absorption tower, and 2 denotes an exhaust tower from which boiler exhaust gas is introduced. The exhaust gas introduction duct (bent duct) 3 is an exhaust gas discharge duct for discharging the exhaust gas from which the sulfurous acid component in the exhaust gas has been removed in the absorption tower section 1 to the outside of the absorption tower section 1. The above-mentioned exhaust gas introduction duct 2 is formed of a bent duct (hereinafter referred to as a bent duct 2), and the bent duct 2 is bent downward at a bent portion 2a and connected to an upper portion of the absorption tower portion 1. ing. 8 is curved at an angle of substantially 90 ° with respect to the absorption tower 1 at the corner indicated by the symbol α in FIG. 8, and the exhaust gas generated by the combustion of fuel in the boiler passes through the bent duct 2 in FIG. After flowing to the right as indicated by the arrow G, the direction is changed by approximately 90 °, and
It is designed to flow downward into the interior.

[0004] Further, the above-mentioned absorption tower section 1 is shown in Figs.
As shown in (1), a plurality of round bars 4 (cylindrical drift reduction devices) arranged in parallel with each other at the upper end (exhaust gas inlet), and arranged on the downstream side of the round bars 4 Lime water jetting section 7 composed of the spray pipe 5 and the spray nozzle 6 provided, a grid 8 provided on the downstream side of the lime water jetting section 7, and a bottom of the grid 8 provided at the bottom of the absorption tower. And a liquid storage tank 9. The spray nozzle 6 is attached to the spray pipe 5 as shown in FIG. 8, and the spray pipe is connected to a plurality of pipes 12 connected to the chamber 10 and supported by the flange 11 as shown in FIGS. 5 is connected. Thus, the lime water in the chamber 10 is supplied to the spray nozzle 6 via the pipe 12 and the spray pipe 5 sequentially and is injected upward, for example, whereby the injected lime water and the exhaust gas are gas-liquid mixed with each other. It is configured to be contacted. The region where the exhaust gas and the lime water come into gas-liquid contact (portion 13 shown by oblique lines in FIG. 11) is called a liquid column portion, and the top portion of the liquid column portion 13 (reference numeral 14 in FIG. 11).
Is indicated as a liquid column top.

Further, as shown in FIG. 7, a mist catcher 15 is provided in the exhaust gas outlet duct 3 following the absorption tower 1 and on the downstream side of the liquid storage tank 9. The exhaust gas that has passed through the absorption tower 1 is configured to be discharged outside from a chimney (not shown) through the mist catcher 15.

The operation of the conventional flue gas desulfurization apparatus 300 will be described as follows. First, the exhaust gas generated by the combustion in the boiler is passed through a bent duct 2 and deflected so that the flow direction is changed by approximately 90 ° at a corner (bend) α of the duct 2. The water flows downward into the absorption tower 1. At this time, the flow of the exhaust gas (exhaust gas flow G) is adjusted in resistance by a plurality of round bars 4 arranged on the upstream side of the liquid column section 13 to reduce the drift. After that, the exhaust gas flows into the liquid column 13 in the absorption tower 1.
Lime water, which is uniformly supplied to the plurality of spray pipes 5 sequentially through the chamber 10 and the pipe 12, is jetted from the spray nozzle 6, and the exhaust gas and the lime water are gas-liquid Contacted. Thereafter, gas-liquid contact between the exhaust gas and the lime water is promoted in the grid 8, and accordingly, the sulfurous acid dissolved in the lime water drops toward the storage tank 9, and the sulfurous acid contained in the exhaust gas is removed. . On the other hand, fine particles that do not fall into the liquid storage tank 9 are removed by the mist catcher 15 arranged on the downstream side of the liquid storage tank 9, and clean gas is discharged from a stack (not shown) on the downstream side. .

[0007]

However, in the conventional flue gas desulfurization apparatus 300 having the above-described structure, even if the flow of the exhaust gas is adjusted with the round bar 4 to reduce the drift, the centrifugal force of the exhaust gas and the Due to the occurrence of a separation flow at the corner α of the bent duct 2, the exhaust gas flow G at the inlet of the absorption tower 1 often becomes a flow having a distribution in the width direction of the absorption tower 1. It is.

[0008] The actual situation will be specifically described as follows. FIG. 12 shows a flow velocity distribution diagram by a model test of the absorption tower section 1 of the conventional flue gas desulfurization apparatus 300, and FIG. 13 schematically shows a practical example of the relationship between the drift reducing round bar 4 and the exhaust gas flow G. ing. The arrows shown in these figures are vector diagrams showing the magnitude and direction of the exhaust gas flow rate. The numerical values in FIG. 12 are the ratio of the gas flow rate to the average gas flow rate in the cross section of the absorption tower (the average value was 1.00). In FIG. 12, the numerical values are arranged and shown as uniform flow velocity lines.

As shown by the respective vectors V in FIGS. 12 and 13, the flow inside the bent duct 2 bent at substantially 90 ° is turned at a right angle, so that the flow is caused by the action of centrifugal force. A point where the flow is fast and a point where the flow is slow occur near the corner portion α, and there are many flows in the direction toward the outside (the right side in the figure) of the duct 2. The maximum flow velocity of the exhaust gas at this point is about 2.3 times the average flow velocity, and the minimum flow velocity is a negative value indicating a reverse flow (upward flow) just before the corner portion α, and is approximately −0.6. Doubled. As can be seen from the results of the model test, the flow velocity distribution of the exhaust gas flow G in the absorption tower section 1 is approximately -0.6 to 2.3 with respect to the average gas flow velocity.
The gas flow velocity distribution has the following ratio.

Generally, in order to obtain the desulfurization efficiency as planned, the flow velocity distribution of the exhaust gas in the absorption tower 1 is about 0.7.
It is necessary to make it within 1.3.
In fact, the conventional flue gas desulfurization apparatus 300 provided with the above cannot obtain such a gas flow velocity distribution. As described above, when there is a large difference in the gas flow velocity distribution at various points in the width direction of the absorption tower 1, uniform lime water injection is performed with respect to the flow of the exhaust gas having the distribution in the width direction of the absorption tower 1. Also causes an imbalance between gas and liquid contact with exhaust gas and lime water,
There is a possibility that the desulfurization efficiency is reduced.

Therefore, it is necessary to improve the exhaust gas flow G in the absorption tower 1 of the flue gas desulfurization apparatus 300 to a uniform flow. In addition, even when a drift occurs in the exhaust gas flow G, it is necessary to devise a method for eliminating imbalance between gas-liquid contact between the exhaust gas and the adsorbing liquid (lime water or the like).

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a first object of the present invention is to provide a simple structure for changing the shape of a bent duct at a corner portion of the bent duct. A device for preventing the drift of the bent duct, which can suppress the occurrence of the drift of the flue gas, can obtain a uniform flow of the flue gas at this corner, and can greatly improve the desulfurization efficiency. Is to provide. Further, a second object of the present invention is to provide a method for injecting lime water corresponding to the deviation of the flow rate of the exhaust gas due to the drift, even when the flow of the exhaust gas is deviated, whereby the gas between the exhaust gas and the lime water is discharged. An object of the present invention is to provide a drift prevention device having a configuration capable of correcting imbalance in liquid contact and greatly improving desulfurization efficiency.

[0013]

In order to achieve the first object, according to the present invention, a column-shaped drift reduction device is arranged at a position downstream of a bent portion of a bent duct, A partition plate is installed on the bottom of the duct on the upstream side of the bent portion of the bent duct. In addition, in order to achieve the above-mentioned second object, according to the present invention, pressure is applied to the upstream and downstream sides of a drift reducing round bar used in a flue gas desulfurization apparatus for reducing drift of an exhaust gas flow. By providing openings for measurement and controlling the amount of adsorbent injected from the spray nozzle in accordance with the flow rate determined from the pressure at the pressure measurement openings, the gas between the exhaust gas and the adsorbent (lime water, etc.) The optimal injection amount of the adsorbing liquid is adjusted so that the liquid contact is the best.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 6, the same parts as those in FIGS. 7 to 13 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIGS. 1 and 2 show a first embodiment of the present invention. FIG. 1 is a plan view of a flue gas desulfurization apparatus 100 provided with a drift prevention device according to the present invention, and FIG. It is the side view. In this example, near the inlet of the absorption tower section 1 of the flue gas desulfurization apparatus 100, the liquid column section 13 is located downstream (downstream side) from the bent section 2 a of the bent duct (90 ° bent duct) 2. Numerous cylindrical resistors (round bars) 4 on top of
In addition to arranging a cylindrical drift reduction device consisting of
One partition plate 22 is provided at a location on the duct upstream side (upstream side) of the bent portion 2a and near the inlet of the absorption tower portion 1, and a single partition plate 22 is disposed between the round bar 4 and the partition plate 22. It is provided with a drift prevention device configured as described above.

More specifically, the multiple circles
The column-shaped round bar 4 is located in the horizontal plane at the entrance of the absorption tower 1.
Parallel to each other at equal intervals,
One partition plate 22 has an arrangement surface (horizontal surface) of the cylindrical round bars 4.
Are arranged upright along a vertical plane orthogonal to. What
Note that the partition plate 22 is folded as shown in FIG.
In the width direction of the bent duct 2, that is, in the flow direction of the exhaust gas,
One direction in the horizontal plane orthogonal to₁direction)
So that it extends over the entire width of the bent duct 2
Are located in Also, as shown in FIG.
With respect to the height direction of the duct 2, ie, the flow direction of the exhaust gas
One direction in an orthogonal vertical plane (arrow W in FIG. 2) _TwoDirection)
And the height H of the partition plate 22₁Bends in the duct 2
Width H of gas passage 2b_TwoSet much lower than the partition
At the place where the plate 22 is provided,
Parts other than the part partitioned by the partition plate 22 serve as an exhaust gas passage.
It has been done.

Since the structure from the spray nozzle 6 to the mist catcher 15 on the downstream side is the same as that of the conventional one, the illustration is omitted and the explanation is omitted.

Next, a flue gas desulfurization apparatus 100 provided with a drift preventing device comprising a round bar 4 (drift reducing device) and a partition plate 22.
The operation of is described as follows. First, the exhaust gas from the boiler is discharged into the exhaust gas passage 2 in the bent duct 2.
1 and 2 flows from left to right in FIG. 1 and is turned 90 ° at the bent portion 2 a of the bent duct 2 and introduced into the inlet of the absorption tower 1. At this time,
A part of the exhaust gas flow G collides with a partition plate 22 attached to a duct bottom part 21 near the inlet of the absorption tower part 1, and a part of the colliding gas flow is accelerated, as shown by an arrow β in FIG. It flows so as to go around the corner α of the bent duct 2. Next, the exhaust gas flow G reaches the round rods 4, which are cylindrical resistive elements, and the drift of the flow velocity due to the centrifugal force generated by the bent duct 2 at this point is caused by these round rods 4.
Thus, the liquid flows into the liquid column 13 on the downstream side.

FIG. 3 shows a flow velocity distribution diagram by a model experiment using the flue gas desulfurization device 100 provided with the drift prevention device having the above-described configuration. From FIG. 3, it can be seen that the prevention of drift is satisfactorily achieved by the operation effect of the partition plate 22, that is, the control operation of the flow direction and the flow velocity of the exhaust gas resulting from the provision of the partition plate 22. That is, FIG.
As is clear from the above, the arrow vector V indicating the direction and magnitude of the gas flow has a substantially uniform length except for a part on the side of the corner portion α, and the direction is also downward as compared with the case of the conventional device. It can be seen that the flow is close. In addition, no reverse flow (upward flow) that occurred on the corner portion α side in the conventional case occurs at all, and it can be seen that the reverse flow region has disappeared. Further, the flow velocity distribution of the exhaust gas flow G has a ratio of about 0.31 to 1.36, and therefore, the flow velocity distribution is within ± 30% except for the area near the corner α. I understand. Therefore, according to the flue gas desulfurization apparatus 100 of this example, it is expected that a high desulfurization efficiency as planned is achieved.

4 to 6 show a second embodiment of the present invention. FIG. 4 is a plan view of a main part of a flue gas desulfurization apparatus 200 provided with a drift prevention device according to the present invention. FIG. 2 is an explanatory diagram of a pressure measurement opening provided in the drift reducing round bar 4, and FIG. 6 is a plan view of a main part of the flue gas desulfurization device 200. In this embodiment, as shown in FIG. 4, a pair of pressure measurement openings 31 and 32 are provided in a round bar (cylindrical resistor) 4 used for reducing the drift of the exhaust gas flow G, and these pressure measurement openings 31 and 32 are provided. Holes 31,3
The desulfurization efficiency is improved by adjusting the amount of lime water sprayed from the spray nozzle 6 according to the flow rate of the exhaust gas obtained from Step 2.

The structure of the present embodiment will be specifically described as follows. First, holes 31 and 32 for pressure measurement are formed in the round bar 4 for reducing drift, which is provided on the upstream side of the spray nozzle 6.
Is open. It is ideal that all the round bars 4 are provided with the pressure measurement openings 31 and 32, respectively, but in this example, each of the round bars 4 is arranged for every certain block (for example, every two blocks as shown in FIG. 4). Each of the round bars 4) is provided with pressure measurement openings 31 and 32.

FIGS. 5 (a) and 5 (b) show the round bar 4 and the pressure measurement holes 31 and 32. The pressure measurement hole 31 is located relatively upstream in the flow direction of the exhaust gas. The pressure measurement opening 32 is disposed relatively at the downstream side in the flow direction of the exhaust gas and serves as a downstream pressure detection hole. As shown in FIG. 5 (b), each of the openings 31 and 32 is composed of a plurality of holes, and is disposed at a position equally divided at a predetermined angle with respect to the exhaust gas flow G. Are connected to the upstream pressure extraction pipe 33 and the downstream pressure extraction pipe 34, respectively. And, each pressure extraction pipe 33, 3
4, and FIG. 5 (b) in directly facing (disposed at an angle of 180 ° to each other) before flow side pressure measuring openings A ₁ and the rear flow side pressure measuring hole B _1, similarly, the A ₂ B ₂ , A ₃ and B ₃ , A ₄ and B ₄ , A ₅ and B ₅ are a pair, respectively.

As shown in FIG.
The reference numerals 3 and 34 are connected to a digital manometer 40, and the output of the digital manometer 40 is supplied to an arithmetic processor 42 via an A / D converter 41. Further, the output signal of the arithmetic processing unit 42 is sequentially transmitted to a motor 45 disposed in the middle of a branch pipe 45 (see FIG. 6) of the chamber 10 via a lime water flow rate calculator 43 and an electric valve opening degree controller 44. It is supplied to a valve 46. In this example, as shown in FIG. 6, several branch pipes 47 are branched from the branch pipe 25 of the chamber 10, and these branch pipes 47 are spray pipes (spray nozzles) through the flange 11. Mounting pipes) 4 are respectively mounted.

Thus, in the flue gas desulfurization apparatus 200 of this embodiment, the pressure measurement is performed at the upstream and downstream sides of the round bar 4 arranged to reduce the drift generated at the bent portion of the bent duct. Openings 31 and 32 are provided, and pressure extraction pipes 33 and 34 are attached to these pressure measurement openings 31 and 32, respectively, and the pressure at the upstream and downstream sides of the round bar 4 is applied to the digital manometer 40. To detect the differential pressure (dynamic pressure).
The digital manometer 40 has an A / D converter 41.
And the arithmetic processing unit 42 are sequentially connected.
Is supplied to the lime water flow rate calculator 43 to calculate the electric valve opening, and the chamber 10 and the spray nozzle 6
An electric valve 46 (FIG. 6) provided in a branch pipe 45 between
(See (a) and (b)).

Next, the flue gas desulfurization apparatus 20 having the above-described configuration will be described.
The operation of the zero drift countermeasure device will be described below. Each pressure P of the upstream-side pressure measurement opening 31 and the downstream-side pressure measurement opening 32 facing the upstream side and downstream side of the round bar 4.
_t, the difference between P _S is measured with a digital manometer 40.
From this measurement result, the dynamic pressure of the exhaust gas is known, and the flow rate of the exhaust gas is obtained. Incidentally, the difference between the exhaust gas pressure P _S in the exhaust gas pressure P _t and the rear flow side pressure measuring aperture 32 in the upstream-side pressure measuring aperture 31 is a dynamic pressure of the apparent advance wind tunnel or the like in Compare and test as a standard pitot tube. It is known that this apparent dynamic pressure generally has a dynamic pressure value that is approximately twice the true dynamic pressure.

Based on the flow velocity value obtained by the arithmetic processing unit comprising the A / D converter 41 and the arithmetic processing unit 42 based on the dynamic pressure, the round bar 4 having the pressure measurement openings 31 and 32 attached thereto.
The flow rate of the exhaust gas in the vicinity will be known. In the present example, the round bar 4 has a plurality of pressure measurement openings 31 and 32 (the upstream-side pressure extraction holes A _{1 to} A ₅ and the downstream-side pressure extraction holes B _1.
.About.B ₅₎ it is opened, but so as to adopt the largest value of the differential pressure.

From the relationship between the flow rate of the exhaust gas and the optimum injection amount of the lime water, the flow rate of the lime water in accordance with the flow rate of the exhaust gas obtained based on the pressure measurement result is obtained in the lime water flow calculator 43. In addition, the flow rate of the lime water and the electric valve 46
The opening degree of the electric valve 46 is controlled by the electric valve opening controller 44 using this relation. Thus, that is, by controlling the electric valve 46 attached to the branch pipe 45 of the chamber 10 for each block, the lime water flow rate corresponding to the flow velocity measurement result for each block is controlled, and as a result, the lime water flow rate is adjusted according to the exhaust gas flow rate. The imbalance of gas-liquid contact is corrected by injecting the optimal amount of lime water injection.

To summarize the above operations, first,
The pressure on the upstream side and downstream side of the round bar 4 is measured by a digital manometer 4.
Measurement is made at 0, and the pressure difference (dynamic pressure) between the upstream side and the downstream side is determined. Since this dynamic pressure indicates about twice the true dynamic pressure, the A / D converter 4 connected downstream to the digital manometer 40
1 and the processor 42 determine the exhaust gas flow velocity (flow rate) at the location where the pressure measurement openings 31 and 32 are attached. Since the relationship between the exhaust gas flow rate and the optimum injection amount of lime water can be calculated in advance by theoretical calculation, the pressure measurement openings 31 and
The lime water flow rate calculator 43 can calculate the optimum lime water injection amount at the place where the lime water 32 is attached. Since the opening degree of the electric valve 46 according to the amount of lime water injection is also known in advance by a test or the like, by controlling the opening degree of the electric valve 46 provided in the piping of the spray nozzle 6 and the middle of the chamber 10, absorption is achieved. The injection amount of lime water can be controlled in accordance with the flow velocity distribution accompanying the drift near the inlet of the tower section 1, thereby enabling the optimal amount of lime water injection for gas-liquid contact (optimal injection amount). Thus, the imbalance of the gas-liquid contact is eliminated.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made based on the technical idea of the present invention. For example, the drift prevention device according to the present invention is not limited to a flue gas desulfurization device, and is applicable to various fluid machines using a bent duct. Further, the present invention is not limited to a bent duct having a bending angle of 90 °, and the present invention can be applied to a bent duct bent at an obtuse angle or an acute angle other than 90 °.

[0030]

As described above, according to the first aspect of the present invention, the following effects can be obtained. (B) The cylindrical drift reduction device is arranged at a position downstream of the bent portion of the bent duct, and a partition plate is installed at the bottom of the duct upstream of the bent portion of the bent duct. Therefore, due to the presence of the partition plate, the flow of the exhaust gas flow colliding with the partition plate is accelerated in the bent portion and flows into the downstream-side cylindrical drift reduction device, and the flow is caused by centrifugal force or the like in the bent portion. The occurrence of drift is prevented. Therefore, according to the present invention, a simple configuration in which a partition plate is simply attached without changing the shape of a bent duct (for example, a 90 ° bent duct or the like) of a newly-installed or existing flue gas desulfurization device is adopted. Thereby, drift can be prevented and the desulfurization efficiency can be greatly improved. (B) The cylindrical drift reduction device is a cylindrical resistor (cylindrical rod,
Since it is a round bar, a standard circular duct can be diverted, and the partition plate may be a simple iron plate, so that the construction is easy and the cost is low. (C) The backflow region does not occur, and in the case of a flue gas desulfurization device, the solution (lime water, etc.) from the liquid column does not scatter in the device, and no corrosion prevention measures are required. (D) The backflow region is eliminated, and the pressure loss of the device is reduced. (E) In many cases, guide vanes are attached to the bent part of a bent duct as a measure to prevent this kind of conventional drift.
In this case, maintenance is difficult due to the corrosive gas. On the other hand, according to the present invention, a round bar (cylindrical bar)
Need only be replaced, and a significant improvement in maintainability can be expected.

According to the second aspect of the present invention,
The pressure (dynamic pressure) is measured by providing pressure measurement openings at the upstream and downstream sides of the drift reducing round bar, and the amount of adsorbed liquid sprayed from the spray nozzle according to the flow rate obtained from this pressure. Is controlled so that the gas-liquid contact between the exhaust gas and the adsorbent is optimal, so that the optimal amount of the adsorbent injected can be adjusted. ) Can be performed, whereby the imbalance of gas-liquid contact can be corrected, and the desulfurization efficiency can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a flue gas desulfurization device including a drift prevention device according to a first embodiment of the present invention.

FIG. 2 is a side view of a flue gas desulfurization device including the drift prevention device according to the first embodiment of the present invention.

FIG. 3 is a flow velocity distribution diagram of a model test of the drift prevention device according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram illustrating a pressure measurement system of a main part of a flue gas desulfurization device including a drift prevention device according to a second embodiment of the present invention.

FIG. 5 is a detailed view of an opening for pressure measurement in a flue gas desulfurization apparatus provided with a drift prevention device according to a second embodiment of the present invention, wherein (a) is provided on a round bar that is a cylindrical resistor. FIG. 5B is a side view showing the obtained pressure measurement opening, and FIG. 5B is a sectional view taken along line XX in FIG.

FIG. 6 (a) is a plan view of a lime water supply system in a flue gas desulfurization apparatus having a drift prevention device according to a second embodiment of the present invention, and FIG. 6 (b) is a front view of the lime water supply system. .

FIG. 7 is a front view showing a configuration of a conventional flue gas desulfurization device.

FIG. 8 is a sectional view taken along line AA in FIG.

FIG. 9 is a sectional view taken along line BB in FIG. 8;

FIG. 10 is a plan view of a conventional flue gas desulfurization device.

FIG. 11 is a side view of a main part of a conventional flue gas desulfurization device.

FIG. 12 is a flow velocity distribution chart of a model test of a conventional flue gas desulfurization apparatus.

FIG. 13 is a view schematically showing a round bar (resistor) for reducing drift and a flow of exhaust gas in a conventional desulfurization apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Absorption tower part 2 Bend duct (duct for exhaust gas introduction) 2a Bend part 4 Round bar (cylindrical resistor) 5 Spray pipe 6 Spray nozzle 13 Liquid column part 21 Duct bottom part 22 Partition plate 23 Non-drift control device 31, 32 Opening for pressure measurement 33 Upstream pressure outlet pipe 34 Downstream side pressure outlet pipe 40 Digital manometer 41 A / D converter 42 Arithmetic processor 43 Lime water flow rate calculator 44 Motorized valve opening controller 45 Branch pipe 46 Electric Valves 100, 200 Flue gas desulfurization equipment A ₁ A ₅ Opening for upstream pressure measurement B ₁ B ₅ Opening for downstream pressure measurement G Exhaust gas flow α Corner

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshihiro Sato 5-717-1 Fukabori-cho, Nagasaki City, Nagasaki Pref.

Claims (2)

[Claims] 1. A cylinder-type drift reduction device is disposed at a position downstream of a bent portion of a bent duct, and a partition plate is installed on a bottom surface of the duct upstream of the bent portion of the bent duct. A device for preventing drifting in a bent duct, characterized in that: 2. A pressure-measuring opening is provided at each of a upstream side and a downstream side of a drift reducing round bar used in a flue gas desulfurization apparatus for reducing drift of an exhaust gas flow. By controlling the amount of liquid adsorbed from the spray nozzle in accordance with the flow rate determined from the pressure at the opening, the optimal amount of liquid adsorbed is adjusted so that the gas-liquid contact between the exhaust gas and the liquid adsorbed is best. A device for preventing drifts in a bent duct, characterized in that: