WO2018103340A1

WO2018103340A1 - Water scrubber for high-efficiency removal of aerosol

Info

Publication number: WO2018103340A1
Application number: PCT/CN2017/093400
Authority: WO
Inventors: 钟璐; 胡小吐; 刘勇; 杨颖欣; 胡静龄
Original assignee: 广东佳德环保科技有限公司
Priority date: 2016-12-08
Filing date: 2017-07-18
Publication date: 2018-06-14
Also published as: CN206343056U

Abstract

A water scrubber for high-efficiency removal of aerosol is positioned inside an absorption tower, and comprises the following components arranged sequentially in a flowing direction of a flue gas: a gas cap tray (1); a padding layer (2); and a spray scrubbing layer (3). The gas cap tray (1) comprises a base plate (11) fixed to the interior of the absorption tower by means of a side plate of the absorption tower. A return water inlet (12) is arranged at one side of the base plate (11). Water sprayed for scrubbing is collected by the base plate (11) and flows through the return water inlet (12) to reach a recycling device. A plurality of swirling flow gas caps (13) are provided above the base plate (11). A flue gas flows through a central portion of the swirling flow gas cap (13) from bottom to top, and undergoes aerosol removal processing before being discharged from an upper portion of the gas cap.

Description

Water washing device with high efficiency for removing aerosol

Technical field

The utility model belongs to the technical field of flue gas dust removal, and relates to a water washing device, in particular to a water washing device with high efficiency for removing aerosol.

Background technique

With the increasing environmental pollution problems and the increasing awareness of environmental protection, governments around the world, especially the Chinese government, are gradually implementing strict standards for coal-fired flue gas emissions in terms of smoke emissions. A large amount of flue gas generated by enterprises such as thermal power plants requires procedural flue gas desulfurization and dust removal before the atmosphere is removed. The flue gas desulfurization treatment method can be generally divided into a dry method, a semi-dry method, and a wet desulfurization process. At present, most thermal power plants use a wet desulfurization process for flue gas desulfurization.

Chinese patent CN 201454393 U discloses a novel ammonia flue gas desulfurization device for purifying flue gas discharged from the top of a desulfurization tower, comprising three independent absorption liquid circulation systems, and a raw material ammonia inlet port is arranged on the lower layer and the middle layer circulation line, so that The desulfurization tower always has a deamination section for recovering ammonia. The cross section of the flue gas inlet and outlet is rectangular, the ratio of the length of the long side of the rectangle to the diameter of the tower body is 0.55-0.95, the inlet area of the flue gas is 0.20-0.40 of the tower body area; the cross section of the flue gas outlet is rectangular or round, and the flue gas outlet The area is 0.15-0.40 of the tower area. The technology also discloses that a spray pipe, a packing layer and an air bubbling pipe are arranged in the desulfurization tower. Although the technology can stabilize the gas flow to a certain extent, the effect of the flue gas treatment is still not ideal.

CN103920371A discloses an absorption tower comprising an absorption device, characterized in that a cooling humidification device is coupled to the top of the absorption device, and an electric demisting device is coupled to the top of the cooling humidification device; the absorption device and the cooling humidification device Providing a first joint interface, a second joint interface is disposed between the cooling humidification device and the electric mist eliminator; the first and second joint interfaces are flanged or welded; the absorbing device is The liquid separation device, the desulfurization absorption section and the liquid storage section are sequentially arranged, the liquid separation device is provided with a circulating absorption liquid inlet, the liquid storage section is provided with a circulating absorption liquid outlet, and the lower part of the desulfurization absorption section is provided with smoke. The gas inlet; the absorption device further comprises a defoaming layer and a packing layer; the cooling humidifying device comprises an upper gas liquid separating plate and a lower gas liquid separating plate, and a cooling liquid outlet is arranged adjacent to the upper gas liquid separating plate; a coolant inlet is disposed adjacent to the lower gas-liquid partitioning plate, and a plurality of pipes are disposed between the upper and lower gas-liquid partitioning plates, and a humidifying liquid inlet is disposed at an upper portion of the pipe, and an external humidifying liquid is externally; the electric defogging Top of the device Set flue gas outlet. Although the technology is packaged The electric demisting device and the packing layer are included, but the packing layer is disposed in the absorption tower, and the air flow of the flue gas is not adjusted.

Therefore, the prior art absorption tower spray efficiency is not high, the gas-liquid contact surface is not large enough to affect the spray washing effect, entrainment of flue gas, and there are problems such as easy scaling.

Utility model content

The utility model provides a water washing device with high efficiency for removing aerosol, which overcomes the problems of poor washing effect and easy scaling of the existing absorption tower. The utility model adopts the following technical solutions:

A high-efficiency aerosol removing water washing device is located inside the absorption tower, and includes a gas cap tray, a packing layer and a water washing spray layer in sequence along the flow direction of the flue gas, the gas cap tray including a chassis, the chassis The side plate of the absorption tower is fixed in the absorption tower; one side of the chassis is provided with a water return port, and the spray washing water collected by the chassis flows to the recovery device through the water return port; a swirling gas cap, the flue gas enters from the bottom up in the middle of the swirling gas cap, and is exhausted from the upper part of the gas cap after demisting;

The filler layer is provided with a support beam, and the support beam is arranged with a grid plate on which the ceramic filler is laid;

The water spray spray layer is provided with a spray pipe and a spray nozzle, the spray pipe is connected with a water washing pump, a filter is arranged at the front end of the water washing pump, and a regulating valve of the water supply pump outlet pipe is used for water supply to the absorption tower. In order to maintain the absorption tower level balance.

Preferably, the swirling gas cap is distributed across the central axis of the water return port of the chassis and evenly drains the chassis.

In the above preferred embodiment, the swirling gas cap comprises a sleeve, a liquid collecting bottom plate, a blade, a blind plate and a lower water tank; the upper end of the blade is connected to the sleeve, the lower end is connected to the blind plate, and the blind plate is fixed on the liquid collecting plate. The upper end of the sleeve is provided with a plurality of lower water tanks, and the lower water tank is provided with an upper cover plate, and the lower water tank is penetrated from the upper cover plate to the middle of the sleeve.

Further, the upper end of the sleeve is provided with four lower water tanks.

Further, the lower water tank is uniformly distributed along the circumferential direction of the liquid pool bottom plate.

Further, the blade has an elevation angle of 25-30° and a radial angle of 12°-18°.

Preferably, the water spray spray layer comprises a first water spray spray layer and a second water spray spray layer from top to bottom, and the first water spray spray layer is interlaced with the spray pipe of the second water spray spray layer. distributed.

Further, the spray nozzle of the second water spray layer is distributed in a cross and is located directly above the swirl gas cap.

Beneficial effects:

1. Install a set of water washing tray on the upper part of the spray tower slurry to wash the ammonia gas and ammonium sulfate entrained in the flue gas, which can greatly reduce the amount of flue gas entrainment.

2. New washing equipment and packing layer to improve the desulfurization capacity, reduce the generation of aerosol, strengthen the capture and washing of fine aerosols, increase the particle size, and improve the efficiency of aerosol removal.

3. The spray nozzle of the second water spray layer is located directly above the swirl gas cap and coincides with the distribution of the swirl gas cap. After the second water washing spray layer is in full contact with the swirling gas cap, the flue gas generates movement in a plurality of directions in the first water washing spray layer, thereby further increasing the dust removing efficiency.

DRAWINGS

Figure 1 is a schematic view showing the positional structure of the water washing device in the absorption tower of the present invention;

Figure 2 is a front elevational view showing the structure of the gas cap tray of the present invention;

3 is a top plan view showing the structure of the gas cap tray of the present invention;

Figure 4 is a schematic view showing the structure of the swirling gas cap of the present invention;

Figure 5 is a schematic cross-sectional view of the swirling gas cap of the present invention taken along the line A-A in Figure 4;

Figure 6 is a top plan view of the water spray layer of the present invention.

Reference numerals: 1, air cap tray; 11, chassis; 12, water return; 13, swirling gas cap; 131, blade; 132, sleeve; 133, blind plate; 134, liquid collecting floor; 136, upper cover; 2, filler layer; 3, water spray layer; 31, first water spray layer; 311, first water spray layer spray nozzle; 32, second water spray layer; 321, a second water spray spray nozzle; 4, an absorption tower; 5, a washing tank; 6, a water washing pump.

detailed description

The specific embodiments of the present invention are further described below:

As shown in Figures 1 and 2, a high efficiency aerosol removal water scrubber is located inside the absorber tower above the spray layer. The absorption tower further comprises a water washing pump and a water washing tank, and comprises, in order of flow direction of the flue gas, a gas cap tray 1, a packing layer 2, a water washing spray layer 3, the air cap tray 1 comprises a chassis 11, and the chassis 11 is absorbed The side plate 41 of the tower 4 is fixed in the absorption tower 4; one side of the chassis 11 is provided with a water return port 12, and the spray washing water collected by the chassis 11 flows through the water return port 12 to the water washing tank 5, and the water washing tank can be Designed as other recovery devices as needed; a plurality of swirling gas caps 13 are disposed above the chassis 11, and the flue gas enters from the bottom to the top of the swirling gas cap 13 and is vented from the upper portion of the swirling gas cap 13 after defogging. ;

The filler layer 2 is provided with a support beam as a gas-liquid mass transfer and a gas-liquid rectification, wherein the support beam is provided with a grid plate on which the ceramic filler is laid; the water spray spray layer 3 is provided with a spray pipe and a spray nozzle to which the washing pump 6 is connected, A filter is disposed at a front end of the water washing pump 6, and a regulating valve of the outlet pipe of the water washing pump 6 replenishes the absorption tower 4 for maintaining the liquid level balance of the absorption tower 4.

As shown in FIG. 3, the swirling gas cap 13 is distributed along the central axis of the water return port 12 of the chassis 11 and uniformly distributes the chassis, so that the arrangement can effectively collect the washing liquid and increase the gas-liquid contact surface. Improve dust removal efficiency.

As shown in FIG. 4 and FIG. 5, the swirling gas cap 13 includes a sleeve 132, a liquid collecting bottom plate 134, a blade 131, a blind plate 133, and a lower water tank 135. The upper end of the blade 131 is connected to the sleeve 132, and the lower end is connected blindly. a plate 133, the blind plate 133 is fixed on the liquid collecting bottom plate 134; the upper end of the sleeve 132 is provided with a plurality of lower water tanks 135, and the lower water tank 135 is provided with an upper cover plate 136, and the lower water tank 135 is provided by The upper cover 136 extends through the middle of the sleeve 132. The entire swirling gas cap 13 is uniformly distributed in the tower body of the absorption tower 4, the layout is reasonable, the airflow is uniformly passed, and no bias current is generated. In one embodiment of the present invention, the lower end of the sleeve 132 is provided with four lower water tanks 135. As a modification, in another embodiment of the present invention, the lower water tank 135 is uniformly distributed along the circumferential direction of the liquid collecting bottom plate 134.

In one embodiment of the present invention, the blade 131 has an elevation angle of 25-30° and a radial angle of 12°-18°. When the airflow passes through the blade, rotation and centrifugal motion are generated, and the absorption liquid is uniformly distributed to each through the intermediate blind plate. The blade forms a thin liquid layer, which forms a rotating and centrifugal effect with the rotating upward airflow, and is sprayed into fine droplets, which are smashed toward the tower wall. The droplets are collected by gravity to the liquid collecting bottom plate 134. The airflow and the absorbing liquid move relative to each other in the tower, and a large surface area water film is formed at the structural part of the swirling tray, thereby greatly improving the absorption.

The flue gas passes through the spray layer of the absorption tower 4 of the utility model to remove the aerosol in the flue gas, and the airflow is uniform, and the secondary de-fogging device and the spray layer can be stably and more efficiently washed twice and filtered. The flue gas which is then passed through the gas cap tray 1 is again filtered by the packing and then sprayed again, after which the flue gas enters the dust removing device of the absorption tower 4 and is discharged by the flue gas discharging device.

Referring to FIG. 3 and FIG. 6, as a preferred solution, the water spray layer 3 includes a first water spray layer 31 and a second water spray layer 32 from top to bottom, and the first water spray layer 31 and The spray nozzles of the second water spray layer 32 are alternately distributed. Further, the spray nozzle 311 of the second water spray layer 32 is distributed in a cross shape, directly above the swirl gas cap 13, and coincides with the distribution of the swirl gas cap. In this way, after the second water washing spray layer is in sufficient contact with the swirling gas cap, the flue gas generates movement in a plurality of directions in the first water washing spray layer, thereby further increasing the gas-liquid contact area and increasing the dust removing efficiency.

Specific washing tray process parameters:

(1) Flue gas volume: 270000m ³ /h (standard); 319500m ³ /h (working conditions)

(2) Flue gas temperature: 50 ° C

(3) Flue gas flow rate (in the tower): 1.86m/s

(4) Washing plate inner diameter: φ7.8m

(5) Washing spray layer: 2 layers

(6) Spray amount: 200m ³ /h×2

(7) Spray pipe: FRP

(8) Nozzle: Spiral cone, bonded. Pressure 0.1MPa, injection angle 120°

(9) Washing pump: Flow rate 200m3/h, 37kW, 2 sets

(10) Washing tank: 75m3, φ4000×6000mm, carbon steel lining glass scales

(11) Air cap: φ800mm, 2205, thickness 3mm, quantity: 44 pieces.

(12) Air cap total flow area ratio: 46%, air cap flue gas flow rate: 4m/s

(13) Resistance: 200Pa

Variations and modifications of the above-described embodiments may also be made by those skilled in the art in light of the above disclosure. Therefore, the present invention is not limited to the specific embodiments disclosed and described herein, and modifications and variations of the invention are intended to fall within the scope of the appended claims. In addition, although the specific terms are used in the specification, these terms are merely for convenience of description and do not constitute any limitation to the present invention.

Claims

The utility model relates to a water washing device with high efficiency for removing aerosol, which is located inside the absorption tower and includes a gas cap tray, a packing layer and a water washing spray layer in sequence along the flow direction of the flue gas, wherein

The gas cap tray comprises a bottom plate, wherein the bottom plate is fixed in the absorption tower through a side plate of the absorption tower; one side of the bottom plate is provided with a water return port, and the washing water collected by the bottom plate flows to the recovery device through the water return port a plurality of swirling gas caps are arranged above the chassis, and the flue gas enters from the bottom to the top from the middle of the swirling gas cap, and is exhausted from the upper part of the swirling gas cap after defogging;

The filler layer is provided with a support beam, and the support beam is arranged with a grid plate on which the ceramic filler is laid;

The water spray spray layer is provided with a spray pipe and a spray nozzle, the spray pipe is connected with a water washing pump, a filter is arranged at the front end of the water washing pump, and a regulating valve of the water supply pump outlet pipe is used for water supply to the absorption tower. In order to maintain the absorption tower level balance.
The water washing apparatus according to claim 1, wherein said swirling gas cap is distributed in a cross along a central axis of the water return opening of the chassis and uniformly fills the chassis.
The water washing device according to claim 2, wherein the swirling gas cap comprises a sleeve, a liquid collecting bottom plate, a blade, a blind plate, and a lower water tank; the upper end of the blade is connected to the sleeve, and the lower end is connected to the blind plate. The blind plate is fixed on the liquid collecting bottom plate; the upper end of the sleeve is provided with a plurality of lower water tanks, and the lower water tank is provided with an upper cover plate, and the lower water tank is penetrated from the upper cover plate to the middle of the sleeve.
The water washing apparatus according to claim 3, wherein the upper end of the sleeve is provided with four lower water tanks.
A water washing apparatus according to any one of claims 3 to 4, wherein said lower water tank is evenly distributed along the circumferential direction of the liquid pool bottom plate.
A water washing apparatus according to claim 3, wherein said blade has an elevation angle of 25 to 30 and a radial angle of 12 to 18.
The water washing device according to claim 1, wherein the water spray layer comprises a first water spray layer and a second water spray layer from top to bottom, the first water spray layer and the second The spray nozzles of the water spray layer are staggered.
The water washing device according to claim 7, wherein the spray nozzle of the second water spray layer is distributed in a cross and is located directly above the swirl gas cap.