JPH0252020A - Device dispersing fine droplets into gas - Google Patents

Abstract

PURPOSE:To increase dust removing efficiency by providing concentrically a revolving shaft with its rotor blades mounted radially in a cylindrical container and also providing a liquid jetting outlet on the shaft surface and a gas feeding inlet and a gas exhaust outlet in the cylindrical container. CONSTITUTION:When a revolving shaft 3 provided concentrically in a cylindrical container 1 is revolved, gas is introduced from an intake vent 2 into the container 1 following the revolution of rotor blades 4 installed radially on the shaft 3, and droplets jetted out of a liquid jetting outlet 5 on the shaft surface are turned into fine droplets by the rotor blades 4 and dispersed into the gas to carry out dust removing. The gas exhausted out of an exhaust tube 7 of the container 1 enters into a droplet inertia separation device 12 to separate droplets and is exhausted out of an exhaust line 13.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for dispersing minute droplets in a gas used for removing dust and harmful components from exhaust gas.

[Prior Art] As devices for dispersing minute droplets in gas, the spray tower method and the pentier scrubber method are the most widely known. It is also known to carry out the above-mentioned dispersion by driving.

As a first example, as shown in FIG. 3, a rotating shaft 02 driven by a motor 05 and a transmission 06 is provided in the center of a vertical cylindrical container O1, and a plurality of circular plates are mounted on this rotating shaft 02. 03 is attached at right angles to the rotation axis, and the droplets scattered from the periphery of the circular plate 03 into the container collide with the inner surface of the outer peripheral wall and flow down to the guide plate 04 attached to the inner wall of the cylindrical container.
There is a multi-stage droplet dispersion method (hereinafter referred to as multi-stage rotating disk method) in which the liquid is caused to flow down onto a circular plate 03 provided below the circular plate 03, and then scattered as droplets again.

In addition, in Fig. 3, 07 is the liquid inlet, 08 is the gas outlet, and 0
9 is a gas inlet, and 010 is a liquid outlet.

As a second example, as shown in FIG. 4, the target liquid is sucked into a suction port 027 of a centrifugal fan consisting of rotary blades 023 attached to a rotary shaft 021 driven via a motor 025 and a transmission 026. The blown liquid is spouted from the side by the spray 024 and introduced into the centrifugal fan from the same suction port, and the speed of this blown liquid is also increased by the action of the rotation ff023, and this gaseous liquid increases in the space surrounding the rotary blade 023. When rapidly released, the strong liquid generated at the stage when the jet consisting of two phases of gas and liquid with a large difference in specific gravity turns its dynamic pressure into static pressure also causes the droplets to be finely dispersed by the dispersion action. The droplets are dispersed in the gas at the gas outlet 0.
There is a droplet dispersion method (hereinafter referred to as a fan spray method) which also has a fan function and is discharged from the fan.

(Problems to be Solved by the Invention) Problems with the above-mentioned conventional methods are that, for example, in the spray tower type or Henchley scrubber type, the dispersed fine-diameter droplets collide with dust suspended in the gas. When trying to remove dust by adsorption, it is common for the diameter of the droplets to be too large, making it difficult to obtain high dust collection efficiency. If an attempt is made to do so, a huge amount of energy loss will occur, mainly due to the frictional force when the fluid is ejected from the nozzle, and the amount of energy required for the system will rise sharply.

In order to solve the above problems in liquid dispersion using nozzles,
A two-phase flow dispersion system using a multi-stage rotary plate using the above-mentioned vertical cylinder has been proposed, and this system allows processing to be performed per hour faster than the conventional spray cooling tower system or the single Henchley scrubber system. Compared to No. 11, a considerable improvement was obtained in terms of the total size of the droplets formed.

One advantage of this multi-stage rotating disk system, compared to the above-mentioned spray tower system or single Venturi scrubber system, is that the speed increase of the liquid is changed to an intermittent acceleration force transmission instead of a capillary method. However, the problem with this method is that the liquid to be dispersed requires a rotating plate.

Since the energy of the rotational motion of the system is transmitted in a shearing manner, there is basically a large energy loss as a system. In other words, while this a-machine-driven method was recognized to be effective in removing dust of a relatively small diameter, in a comprehensive evaluation of this method compared to the conventional Hencherie scrubber method,
Is the Hencherie scrubber still the industrial method, remaining inferior in practical terms? It is used for i2.

The fan spray method mentioned above as the second example of the mechanical drive method has been practically shown to have a wide range of fineness of the dispersed droplet diameter compared to the other conventional methods mentioned above. . When attempting to increase the fineness of the dispersed liquid (1η diameter) for the purpose of improving adsorption and removal by droplets, it is required to increase the circumferential speed of the rotor blade/end of the fan. , when this is increased, the solid lfj when micro droplets of the added liquid are dispersed in the gas being processed along with this, ? As a result, the fan spray system, which aims to remove dust or absorb and remove gases, achieves its purpose.As a result of the intervention of this device with a fan function, the exhaust treatment process In many cases, the level of pressure addition that matches the pressure loss required for the entire system is exceeded. That is, in order to promote the dispersion of the liquid phase into the gas phase, it is necessary to increase the circumferential speed of the rotor blade tip, and if this is done, it is inevitable that the pressure of the entire airflow will be increased more than necessary. Another problem with the conventional method is that when removing dust from high/medium temperature gas such as Plan I thermal exhaust, the J-type multi-stage rotary plate method is difficult to remove hot exhaust gas at, for example, 300°C at the same time. When introduced into a rotating disk type dust remover, the added liquid becomes dispersed droplets in the area near the heat exhaust introduction part, and is mixed with the dust in the gas. Even if suction before suction 1] occurs, a space is created in which the water in the droplets is vaporized due to the amount of heat the gas has.

That is, in this space, even if dust collection by droplets occurs, as long as water vaporization occurs, the dust collection effect cannot be achieved as a result.

However, during this time, the temperature of the hot gas, which has been deprived of heat by the evaporation of the droplets, decreases, and after passing the region 2. The droplets come into contact with the dust in the gas, and dust removal progresses.

However, as mentioned above, in this method, there is a practical limit to the miniaturization of the droplet diameter that is formed, so although it has the ability to handle thermal 11F gas treatment, it cannot be used as a dust collection device. The evaluation remains low.

On the other hand, in the fan spray one-type, the main body of the device is required to function as a fan, and within the design constraints, as mentioned above, the hot gas introduction section There is not enough space to accomplish the two tasks of lowering the temperature of the hot gas and then generating fine droplets in the space using a gas-liquid two-phase flow to increase the dust removal effect.

Therefore, in practical use of the conventional fan spray method,
In the case of room-temperature gas treatment, the gas is directly inhaled, whereas in the case of hot gas treatment, it is passed through a spray tower or other gas cooling device before being introduced into the system, and then a one-way fan spray system is used. Usually, it is sent to a removal device. In other words, while the one-sided fan spray system, which aims to improve performance, has its advantages, when processing heat exhaust gas, the system is composed of a combination of a cooling device and a dust removal device, which reduces equipment efficiency. There was a problem from a simplification perspective.

The present invention aims to provide a device that solves the problems of the above-mentioned conventional systems.

[Means for Solving the Problems] A device for dispersing microdroplets in a gas according to the present invention includes a cylindrical container, a rotating shaft provided concentrically with the cylindrical container, and a rotating shaft whose tip is attached to the inner wall of the cylindrical container. a plurality of rotor blades radially attached to the rotating shaft located at intervals to form a gas passage between the rotary blades, a liquid spout provided on the surface of the rotating shaft, and a liquid spout provided in the cylindrical container described in It is characterized by having a gas supply port and a gas discharge port.

[Effect]

In the present invention, liquid is ejected from the surface of the rotating shaft, is atomized as the rotor blade rotates, and is then released from the blade tip of the rotor blade into the surrounding gas passage due to its circumferential velocity. dispersed in the gas.

On the other hand, the gas in the gas passage formed between the inner wall of the cylindrical container and the tip of the rotor blade is not subjected to so much interfacial pressure as in the multi-stage rotating disk system. In this way, the movement of the gas in the cylindrical container in which the microdroplets are to be dispersed is made similar to that in the conventional multi-stage rotating disk system, thereby avoiding an unnecessary increase in the pressure of the gas, and at the same time preventing the formation of microdroplets and their dispersion. In terms of capacity, it has the same capacity as the conventional fan spray type, requires less energy, and can effectively disperse minute droplets in the gas.

In addition, when handling high-temperature gas, if you follow the gas flow path inside the container, the gas temperature will drop rapidly in the first half of the gas's passage through the container due to the heat generated by the dispersed liquid NO. However, during this process, the vapor that has once emitted into the gas improves again as the temperature drops, and fine droplets are generated within the electric body. In this way, a portion of the liquid that was initially dispersed into the gas from the tip of the rotary blade and turned into minute droplets is evaporated and vaporized.
jJ IrN By performing the J conversion, the droplets dispersed in the gas become finer.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

l has a gas suction port (supply port) 2 in the tangential direction,
It is a cylindrical container arranged with its axis facing almost horizontally.A rotating shaft 3 is provided concentrically within the container 1, and a plurality of radial rotor blades 4 are attached to the rotating shaft 3. There is.

The rotor blade 4 has a length such that its tip has a sufficient distance from the inner wall of the container l, and has a gas passage spaced at −1 − intervals outside the rotation locus of the rotor blade tip. 6 is formed.

A liquid spout 5 is provided between adjacent rotations R4 and 4 on the surface of the rotating shaft 3. 7 is a gas discharge pipe that opens into the container l and is connected to the liquid tank 9; 81 is a accumulated liquid discharge pipe provided at the lower side of the container 231; the accumulated liquid discharge pipe 8 is connected to the gas discharge pipe 7; It is connected.

A droplet t1 separation device 12 is attached to the gas discharge pipe 7, and the gas that has passed through the separation device 12 is discharged into a discharge passage 13. A spray pipe 11 having a pump 11 is connected to the liquid tank 9, and the intermediate pipe 11 is connected to the rotating shaft 3 so that the liquid in the liquid tank 9 is supplied to the rotating shaft 3.

The container 1st class is on the pedestal 17! 11, and the rotating shaft 3 is
The motor 1 is connected to the motor 1 via the transmission 15 arranged on the 1 side of the coaxial 3.
4, and the other end of the rotating shaft 3 has a rotary joint 16 to which the spray pipe 11 is connected.
is provided. Further, a water supply pipe I7 for replenishment is opened in the liquid tank 7.

In this embodiment, when the rotating shaft 3 is rotated in the direction of the arrow a in FIG. The flow is as shown in . On the other hand, the droplets ejected from the liquid ejection port 5 on the surface of the rotating shaft 3 as shown by the arrows are miniaturized between adjacent rotary blades 4.4 by the rotation of the rotary blade 4, and then rotated. Due to the circumferential speed of the tip of the blade of the station 4, it is emitted toward the gas passage 6 and is dispersed into the gas within the gas passage 6. When the gas temperature is high, the temperature of the gas near the suction port 2 rapidly drops due to the evaporation of a portion of the droplets, and the evaporated sudden air due to this temperature drop condenses again to form fine droplets and become liquid. Droplet refinement is performed.

As described above, the gas in which the micro droplets are dispersed is discharged from the container 1 through the gas discharge pipe 7 as shown by the arrow d, and changes direction in the droplet inertial separator 12, at which time the droplets are separated. After that, it is discharged through the discharge passage 13. On the other hand, the separated droplets and the accumulated liquid accumulated at the bottom of the container are returned to the liquid tank 9, respectively.

In this embodiment, droplets are ejected from the liquid ejection port 5 on the surface of the rotary shaft 3, are sufficiently atomized between the adjacent rotary blades 44, and are caused by the centrifugal force generated by the rotation of the rotary blades 4. It is well dispersed within the gas within the gas passageway G.

On the other hand, the gas in the gas passage 6 flows around inside the volume R'r I as the rotor blade 4 rotates, but because it flows outside the trajectory of the rotor blade 1, it is not pressurized to a large extent and rotates. Less energy is required to drive the blades 4.

As described above, this embodiment requires less energy and can effectively disperse minute droplets in gas. Therefore, the dispersed droplets can adsorb and remove dust, harmful components, etc. in the gas.

In addition, in this embodiment, when dispersing droplets in high-temperature gas, the droplets are formed as described above, and the resulting rapid temperature drop in the gas causes the evaporated air to recondense, causing the droplets to form. When the inorganic substances in the gas are captured by the droplets while being miniaturized, the inorganic components captured in the droplets are
The droplets are concentrated by contact with the high-temperature gas, and the inorganic components can be taken out of the container along with the pocket money liquid.

[Effects of the Invention] As explained above, the present invention can achieve the following effects.

(1) The liquid 11 ejected from the liquid spout on the surface of the rotating shaft is made fine by the rotation of the rotor blade, and the fine droplets are moved along the trajectory of the rotor blade according to the circumferential speed of the tip of the rotor blade. can be dispersed in the gas in the outer gas passage in 1 minute.

(2) Since the gas passage is outside the trajectory of the rotor,
The gas in the passage is not pressurized, so less energy is required to drive the device.

(3) When the temperature of the gas introduced into the gas passage is high, the liquid droplets can be further refined by evaporation and recondensation, and the inorganic components added to the droplets can be concentrated. It can be taken out of the container together with a small amount of liquid.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a perspective view of the same embodiment, Fig. 3 is a line sectional view of a conventional multi-stage disk rotation type droplet dispersion device, and Fig. Figure 4 (A) is a cross-sectional front view of a conventional fan spray one-type droplet dispersion device, and Figure 4 (B)
) is a longitudinal section 1i 1 side view of the same device. 1 - Cylindrical container, 2 - Gas suction port, 3 - Rotating shaft, 4 - Rotating blade, 5 - Liquid spout,
6-gas passage, 7-gas discharge pipe. Agent: Patent Attorney Akigai Sakama (2 people) Figure 1 Figure 2

Claims (1)

[Claims] A cylindrical container, a rotating shaft provided concentrically with the cylindrical container,
a plurality of rotary blades radially attached to the rotating shaft, the tips of which are located at intervals such that they form a gas passage with the inner wall of the cylindrical container; a liquid jet port provided on the surface of the rotating shaft; and an apparatus for dispersing minute droplets in a gas, characterized by comprising a gas supply port and a gas discharge port provided in the cylindrical container.