WO2016023423A1

WO2016023423A1 - Integrated tower for dust removal, desulphurization and denitrification and integrated system for dust removal, desulphurization and denitrification

Info

Publication number: WO2016023423A1
Application number: PCT/CN2015/085906
Authority: WO
Inventors: 余钢; 余光明
Original assignee: 大丰市佳诣电力燃料有限公司
Priority date: 2014-08-15
Filing date: 2015-08-03
Publication date: 2016-02-18
Also published as: CN104117278A; CN104117278B

Abstract

Provided are an integrated tower for dust removal, desulphurization and denitrification and a system comprising the tower. The tower comprises a water film dust removal layer (A1), a denitrification layer (A2), a desulphurization layer (A3) and a steam-water separation layer (A4) successively from the bottom of the tower to the top, wherein the water film dust removal layer (A1) comprises a column (B1) fixed at the bottom of the tower, and an annular water spray pipe is provided at the top of the column (B1); the denitrification layer (A2) comprises a first tower plate (T1), a first gas ascension pipe (S1) and a first spray device; the desulphurization layer (A3) comprises a second tower plate (T2), a second gas ascension pipe (S2) and a second spray device; and a first gas outlet (Q2) is provided on the tower wall of the integrated tower for dust removal, desulphurization and denitrification close to the top of the steam-water separation layer (A4), a seventh liquid inlet (J7) is provided on the tower wall of the integrated tower for dust removal, desulphurization and denitrification close to the bottom of the steam-water separation layer (A4), and a third spray device is provided at the bottom of the steam-water separation layer (A4).

Description

Dedusting, desulfurization and denitrification integrated tower and integrated system for dust removal, desulfurization and denitrification

Technical field

The invention belongs to the field of exhaust gas treatment and purification, and particularly relates to a dust removal, desulfurization and denitrification integrated tower and an integrated system for dust removal, desulfurization and denitrification.

Background technique

In the traditional coal-fired power plants, the exhaust gas after coal combustion is close to or meets emission standards through dedusting and desulfurization and denitrification. Even if some of the exhaust gas has not reached the standard, the exhaust gas is directly discharged into the atmosphere, and the exhaust gas contains sulfur dioxide and nitrogen dioxide. A harmful gas such as nitric oxide and fine solid impurity dust such as fly ash with a small specific gravity and small particles. After the 75 tons of coal is burned in the boiler, the amount of sulfur dioxide emitted can reach 10 tons per day. These sulfur dioxide, nitrogen oxides and fine particles are the main murderers of smog, which will greatly affect the health of residents and even threaten their lives. The current tail gas treatment method can largely eliminate the harmful gases contained in coal-fired flue gas and the magazine solid particles, but it has three major problems: 1. The structure of the desulfurization and denitration device is huge, often composed of several devices. Co-finished; 2, desulfurization and denitrification reaction requires high temperature; 3, the subsequent waste is not well solved, there is still waste discharge, serious pollution; 4, tail gas treatment equipment is prone to residual impurities, resulting in equipment damage and difficult Cleaning, short service life; 5, even by providing a rotatable transmission shaft in the center of the dust removal, desulfurization and denitrification integration tower, and a stirring device fixedly connected to the transmission shaft to treat residual impurities in the equipment, although it can be achieved Easy to clean and extend the service life of the equipment, but it will bring a series of problems at the same time, such as: because the equipment has about 8 floors, the production of the transmission shaft is quite time-consuming and laborious, and due to dust removal and desulfurization The liquid in the integrated tower has certain corrosiveness, and the service shaft has a short service life and needs to be replaced frequently; Subsequent waste disposal has been solved, but due to the addition of waste, on the one hand, the production cost is increased, and on the other hand, the redundant waste is turned into new waste.

Summary of the invention

The technical problem to be solved by the invention is to provide a dust removal, desulfurization and denitrification integrated tower and an integrated system for dust removal, desulfurization and denitrification, which overcomes the above defects, and improves the structure of the dust removal, desulfurization and denitration integrated tower, and the integrated system and tube for dust removal, desulfurization and denitrification. Road improvement to solve more waste, serious pollution, equipment damage It is not easy to clean, has a short service life, and has high waste disposal costs, which is easy to waste.

In order to solve the above technical problems, the present invention provides a dust removal, desulfurization and denitration integrated tower, which comprises a water film dust removal layer, a denitrification layer, a desulfurization layer and a steam-water separation layer in this order from the bottom of the tower.

The water film dust removing layer comprises a column fixed to the bottom of the tower, and a top of the column is provided with an annular water spray pipe near a side wall of the dust removal, desulfurization and denitration integrated tower at the bottom of the water film dust removing layer. a first air inlet and a first liquid inlet are disposed, and a first overflow port is disposed on another sidewall of the dust removal, desulfurization and denitration integrated tower near the bottom of the water film dust removing layer.

The denitration layer comprises a first tray, a first riser pipe and a first spray device, wherein the first tray is fixed on a tower wall of the dust removal, desulfurization and denitration integrated tower, and the first riser pipe runs through the a first tray, the first shower device is disposed above the first tray, and a third liquid inlet is further disposed on the tower wall.

The desulfurization layer comprises a second tray, a second riser and a second spray device, wherein the second tray is fixed on the tower wall of the dust removal, desulfurization and denitration integrated tower, and the second riser penetrates a second tray, the second shower device is disposed above the second tray, and a fifth liquid inlet is further disposed on the tower wall.

a first air outlet is disposed on a tower wall of the dust removal, desulfurization and denitrification integrated tower near the top of the steam-water separation layer, and a tower wall of the dust removal, desulfurization and denitration integrated tower near the bottom of the steam-water separation layer is disposed There is a seventh liquid inlet, and a bottom of the steam-water separation layer is provided with a third spraying device.

As a dust removal, desulfurization and denitrification integrated tower according to the present invention, the positions of the denitrification layer and the desulfurization layer are interchanged.

As a dust removal, desulfurization and denitrification integrated tower according to the present invention, the denitration layer further includes a first blister and a first foam plate, and the first foam plate is disposed above the first tray. The first riser pipe extends through the first foam plate, the first shower device is disposed above the first foam plate, the first blister cover is disposed on the first riser pipe and the Above the first foam board, the cover edge of the first blister is connected to the first foam board, and the third liquid inlet is provided between the first tray and the first foam board On the wall,

The desulfurization layer further includes a second bubble cover disposed above the second tray, the second riser pipe penetrating the second foam plate, the first a second sprinkler device is disposed above the second foam panel, the second blister cover is disposed above the second chimney tube and the second foam panel, and a cover edge connection of the second blister The second foam plate, the fifth liquid inlet is disposed on a tower wall between the second tray and the second foam plate.

As one of the dust removal, desulfurization and denitrification integrated towers according to the present invention, there are several denitration layers, and there are several desulfurization layers.

As a dust removal, desulfurization and denitrification integrated tower according to the present invention, a second overflow port is arranged on the tower wall of the dust removal, desulfurization and denitrification integrated tower near the bottom of the denitration layer, and is located in the denitration layer. a fourth liquid inlet is further disposed on the tower wall of the dust removal, desulfurization and denitration integrated tower;

a third overflow port is disposed on the tower wall of the dust removal, desulfurization and denitrification integrated tower near the bottom of the desulfurization layer, and a sixth overflow wall is disposed on the tower wall of the desulfurization desulfurization and denitrification integrated tower of the desulfurization layer. Inlet port.

As a dust removal, desulfurization and denitrification integrated tower according to the present invention, the multi-layer denitration layer is provided with a first liquid, the first liquid is a dilute nitric acid solution, and the multi-layer desulfurization layer is provided with a first The second liquid is an ash emulsion, and the ash emulsion is a solution obtained by dissolving limestone powder in water or a solution obtained by dissolving limestone powder and lime powder in water and dissolving in water.

As a dust removal, desulfurization and denitrification integrated tower according to the present invention, the water film dust removing layer adopts a wear-resistant anticorrosive material, the desulfurization layer is formed by rotomolding to form an anticorrosive layer, and the denitrification layer is treated with mixed acid. material.

As a dust removal, desulfurization and denitrification integrated tower according to the present invention, the inner wall of the water film dust removing layer (A1) is affixed with granite, the inner wall of the denitrifying layer is affixed with fluoroplastic, and the inner wall of the desulfurization layer is affixed with polypropylene. The internal chamber of the desulfurization layer is protected from clogging by a fluoroplastic.

In order to solve the above technical problems, the present invention also provides a dust removal, desulfurization and denitrification integrated system, which comprises an air intake device, a purification device and a recovery device, the air intake device is connected to the purification device, and the purification device is connected to the recovery device. Device,

The air intake device includes a boiler,

The purification device comprises the dust removal, desulfurization and denitration integrated tower, and the smoke outlet of the air intake device is connected to the first air inlet of the dust removal, desulfurization and denitration integrated tower through a pipeline, and the dust removal, desulfurization and denitration integrated tower The first air outlet is connected to the chimney through a pipeline.

The recovery device includes a ash pool, a stirring tank, a first sedimentation tank and a second sedimentation tank, and the liquid inlet of the ash pool is connected to the first overflow of the dust removal, desulfurization and denitration integrated tower through a pipeline. The liquid inlet of the first precipitation tank is connected to the second overflow port of the dust removal, desulfurization and denitration integrated tower through a pipeline, and the liquid outlet of the first sedimentation tank is connected to the dust, desulfurization and denitrification through a pipeline a fourth liquid inlet of the tower and the third liquid inlet, wherein the liquid inlet of the second sedimentation tank is connected to the dust removal, desulfurization and denitration integrated tower through a pipeline a third overflow port, the liquid outlet of the second precipitation tank is connected to the second liquid inlet of the dust removal, desulfurization and denitration integrated tower through a pipeline, the first liquid inlet and the fifth liquid inlet The liquid inlet of the agitating tank is connected to the liquid outlet of the second sedimentation tank through a pipeline, and the liquid outlet of the agitating tank is connected to the sixth liquid inlet of the dust removal, desulfurization and denitration integrated tower through a pipeline .

As an integrated dust removal and desulfurization and denitration system according to the present invention, the air intake device further includes an induced draft fan, and the induced draft fan is disposed at a smoke outlet of the boiler and the first of the dust removal, desulfurization and denitration integrated tower An air inlet is also disposed on the induced draft fan on the pipeline between the air inlets.

As a dust removal, desulfurization and denitrification integrated system according to the present invention, a second increase is formed between the third inlet of the dust removal and desulfurization denitrification integrated tower and the outlet of the first precipitation tank. Pressure pump.

As a dust removal, desulfurization and denitrification integrated system according to the present invention, a centrifuge is arranged on the pipeline between the third overflow port of the dust removal and desulfurization denitration integrated tower and the liquid inlet of the second precipitation tank.

As a dust removal, desulfurization and denitrification integrated system according to the present invention, a first increase is added to the pipeline between the fifth liquid inlet of the dust removal and desulfurization denitrification integrated tower and the liquid outlet of the second precipitation tank. Pressure pump.

As a dust removal, desulfurization and denitrification integrated system according to the present invention, a milk pump is arranged on the pipeline between the sixth liquid inlet of the dust removal and desulfurization denitrification integrated tower and the liquid outlet of the agitating tank.

As a dust removal, desulfurization and denitrification integrated system according to the present invention, the liquid outlet of the ash pool is connected to the second sedimentation tank through a pipeline, and the liquid outlet of the ash pool and the second a clear liquid pump is disposed on the pipeline between the sedimentation tanks, and a bottom of the first sedimentation tank and the second sedimentation tank is provided with a discharge outlet, and the waste liquid pool is provided with a solid impurity inlet, and the first precipitation tank And the second precipitation barrel discharge outlet is connected to the solid impurity inlet of the waste liquid pool through a pipeline.

Compared with the prior art, the dust removal, desulfurization and denitrification integrated tower and the dust removal, desulfurization and denitrification integrated system proposed by the invention can solve the problems of the prior art, such as large waste, serious pollution, easy damage of equipment and difficult to clean, and short service life. The problem of high waste disposal cost and easy waste production and waste, through the structural improvement of the dust removal, desulfurization and denitrification integrated tower, the improvement of the dust removal, desulfurization and denitrification integrated system and the improvement of the pipeline, the integration of dust removal, desulfurization and denitrification is realized. The waste is processed, the pollution is reduced, the reaction raw materials are saved, and the equipment is easy to clean, the service life is prolonged, and the production cost is reduced. The beneficial technical effects include at least the following:

1. The dust removal and desulfurization denitration device is a tower structure consisting of a water film dust removal layer, a denitrification layer, a desulfurization layer and a steam-water separation layer. The integrated design not only has a simple structure but also saves space; the whole system is from top to bottom. There is liquid flow, forming a hydrocyclone working system, which can make the whole system not easy to occur If the denitrification layer, the desulfurization layer and the vapor-water separation layer are set from the top to the bottom, the liquid flow rate is set to 0.4 m/s, and the flow rate of the lower layer, that is, the intermediate layer is 1.5 of the upper layer. The multiple, that is, 0.6 m/s, the flow rate of the third layer, the lowermost layer, is twice that of the upper layer, that is, 0.8 m/s. The above flow rates are all above 0.4 m/s to ensure that impurities in the system do not sink to the bottom.

2. The denitrification layer in the dust removal, desulfurization and denitrification integrated tower is underneath, and the structure of the desulfurization layer can react the denitrated product with the ash emulsion in the desulfurization to prevent the release of nitric acid into the atmosphere;

3. The denitrification layer and the desulfurization layer are designed with foam plate and blister, which increases the reaction area of the flue gas with the liquid in the denitration layer or the desulfurization layer, improves the reaction effect, and combines the blister foam reaction to prevent the bias flow, and Improve reaction efficiency;

4. The denitration layer and the desulfurization layer in the desulfurization and denitration device are provided with a plurality of layers, which increase the reaction area and optimize the reaction effect;

5. The desulfurization and denitration device also increases the water film dust removal layer. On the one hand, it is treated by water film to preliminarily remove dust and absorb some nitrogen dioxide, sulfur dioxide and other gases which are soluble in water, which makes the desulfurization and denitration effect more remarkable. The first dust inlet and the first liquid inlet are provided in the membrane dust removing layer, and the liquid entering through the first air inlet and the liquid entering the first liquid inlet drive the liquid to rotate, preventing impurities from accumulating in the dead angle and gradually forming glue Condensed, making the equipment easy to clean and prolonged service life;

6. The desulfurization and denitration device is provided with an anti-corrosion inner wall, which avoids corrosion of the inner wall by the liquid in the integrated tower of dust removal, desulfurization and denitrification, thereby improving the service life of the device;

7. In the integrated system of dust removal, desulfurization and denitrification, the equipment of ash slag pool, agitation tank, sedimentation tank, and centrifuge and the installation of pipelines will treat the waste liquid left after the treatment of flue gas, and part of it will continue to participate in the reaction and reduce The cost of producing raw materials, and the other part for sale, increased the company's efficiency;

8. The setting of the booster pump in the integrated system of dust removal, desulfurization and denitrification provides power for the returning liquid, drives the liquid to rotate in the dust removal, desulfurization and denitrification integrated tower, prevents impurities from accumulating in the dead angle and gradually forms a gel, which makes the equipment easy to clean. The service life is extended, the booster pump is connected to the 3-layer structure at the same time, and then the water for rotating the uppermost layer of solution is completely from the water pumped by the booster pump, and then the first layer of water flows into the second layer by gravity, and is tangent The direction drives the second layer of solution to rotate, and then the second layer of water flows into the third layer by gravity, which also drives the solution to rotate in a tangential direction. The first layer is completely rotated by the booster pump, and the second and third layers are mainly rotated by gravity. The solution, booster pump acts as an auxiliary rotation and water inlet.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any inventive labor. among them,

1 is a schematic structural view of a dust removal, desulfurization and denitrification integrated tower of the present invention; and

2 is a schematic structural view of a dust removal, desulfurization and denitrification integrated system of the present invention.

Among them: A1 is the water film dust removal layer, A2 is the denitrification layer, A3 is the desulfurization layer, A4 is the steam-water separation layer, B1 is the column, Q1 is the first inlet, Q2 is the first outlet, and J1 is the first inlet. Port, J2 is the second inlet port, J3 is the third inlet port, J4 is the fourth inlet port, J5 is the fifth inlet port, J6 is the sixth inlet port, J7 is the seventh inlet port, and J7 is the seventh inlet port. Y1 is the first overflow port, Y2 is the second overflow port, Y3 is the third overflow port, T1 is the first tray, T2 is the second tray, S1 is the first riser, and S2 is the second rise. The trachea, P1 is the first blister, P2 is the second blister, M1 is the first foam board, M2 is the second foam board, G1 is the boiler, G2 is the induced draft fan, G3 is the air inlet, and L1 is the dust removal, desulfurization and denitrification. The tower, L2 is the chimney, F1 is the ash pool, F2 is the mixing tank, F3 is the first sedimentation tank, F4 is the second sedimentation tank, F5 is the centrifuge, F6 is the return water, Z1 is the first booster pump, Z2 is the second booster pump, Z3 is the ash pump, and Z4 is the clear pump.

detailed description

The dust removal, desulfurization and denitrification integrated tower of the present invention comprises a denitration layer, a desulfurization layer and a steam-water separation layer in order from the bottom of the tower, and the positions of the denitration layer and the desulfurization layer may be interchanged, that is, from the bottom of the tower The desulfurization layer, the denitration layer and the steam-water separation layer are included, but most preferred is a structure in which the denitration layer is on the lower layer and the desulfurization layer, because the product produced by the denitration layer can be combined with the gray emulsion in the desulfurization layer. The reaction is carried out to prevent substances such as nitric acid from being released from the chimney into the atmosphere. At the bottom layer of the dust removal, desulfurization and denitration integrated tower, a water film dust removing layer may be provided for preliminary dust removal and absorbing some nitrogen dioxide, sulfur dioxide and the like which are soluble in water. The number of layers of the denitration layer and the desulfurization layer may be one layer or multiple layers.

The above described objects, features and advantages of the present invention will become more apparent from the detailed description.

First, "an embodiment" or "an embodiment" as used herein refers to a particular feature, structure, or characteristic that can be included in at least one implementation of the invention. "In the different places in this manual" In an embodiment, the embodiments are not all referring to the same embodiment, and are not separate or selective embodiments that are mutually exclusive.

Next, the present invention is described in detail using a structural schematic diagram or the like. In the detailed description of the embodiments of the present invention, for the convenience of description, the schematic diagram of the dust removal, desulfurization and denitration integrated tower, the dust removal, desulfurization and denitration integrated system will not be partially enlarged according to the general ratio, and The illustrations are only examples, which should not limit the scope of the invention. In addition, the actual production should include three-dimensional space of length, width and depth.

The structure of the water-removing dust-removing layer, the denitration layer, the desulfurization layer and the steam-water separation layer is sequentially introduced from the bottom of the tower in the dust removal, desulfurization and denitrification integration tower.

Please refer to FIG. 1. FIG. 1 is a schematic structural view of a dust removal, desulfurization and denitration integrated tower according to the present invention. As shown in FIG. 1 , the present invention provides a dust removal, desulfurization and denitrification integrated tower, which comprises a water film dust removal layer A1, a denitrification layer A2, a desulfurization layer A3 and a soda separation layer A4 in this order from the bottom of the tower. . The water film dust removing layer A1 may be separately disposed outside the tower.

The water film dust removing layer A1 includes a column B1 fixed to the bottom of the tower, the column B1 disposed in the middle forms an annular passage with the tower wall, and the top of the column B1 is provided with an annular water spray pipe (not shown). The liquid sprayed from the annular spray pipe forms a liquid film, and the liquid sprayed on the tower falls onto the tower wall and flows down to the bottom to form a flush on the tower wall to prevent the impurities from condensing and accumulating on the tower wall. The liquid flowing to the bottom accumulates below the first overflow port Y1, and when the liquid accumulation height flowing to the bottom is equal to or exceeds the first overflow port Y1, the liquid flows from the first overflow port Y1 Flow out.

a first air inlet Q1 and a first liquid inlet J1 are disposed on a side wall of the dust removal, desulfurization and denitration integrated tower near the bottom of the water film dust removing layer A1, and the bottom of the water film dust removing layer A1 is adjacent to the bottom A first overflow port Y1 is disposed on the other side wall of the dust removal and desulfurization denitration integrated tower. Preferably, the first air inlet Q1 is disposed on a tower wall of a portion below the bottom liquid level of the water film dust removing layer A1, that is, the height of the first air inlet Q1 is lower than the first overflow. The height of the port Y1, the liquid flowing in from the first intake port Q1 rotates along the annular passage to drive the rotation of the entire liquid. Preferably, the first intake port Q1 partially extends below the liquid level, and the flue gas enters the water film dust removing layer A1 from the first air inlet Q1. Since the column B1 forms an annular passage with the tower wall, the flue gas enters and rotates in the same direction, and the flue gas from the first air inlet Q1 extending below the liquid surface can also drive the liquid to rotate, preventing impurities from accumulating in the pile. Dead ends and gradually form a gel. The water film dust removing layer A1 performs preliminary dust removal on the flue gas and absorbs some nitrogen dioxide, sulfur dioxide and the like which are soluble in water. In another embodiment, the water film dust removing layer A1 is near A second liquid inlet J2 is provided on the tower wall of the dust removal, desulfurization and denitrification integrated tower at the top for flowing the recovered liquid into the water film dust removing layer A1.

The denitration layer A2 is a single-layer structure, and a plurality of the denitration layers A2 may constitute a multi-layer denitration layer, and the denitration layer A2 includes a first tray T1, a first riser S1, and a first spray. a device (not shown), in order to increase the reaction area, in one embodiment, the denitrification layer A2 further includes a first blister P1, a first foam plate M1, and the first tray T1 is disposed at the first Below the foam board M1, the first tray T1 is fixed on the tower wall of the dust removal, desulfurization and denitration integrated tower, and the first riser pipe S1 runs through the first tray T1 and the first foam board M1. The first shower cover M1 is disposed above the first foam board M1, and the first bubble cover P1 is disposed above the first air lift pipe S1 and the first foam plate M1. a cover edge of the first blister P1 is connected to the first foam plate M1, and a third liquid inlet J3 is further disposed on the tower wall between the first tray T1 and the first foam plate M1. In one embodiment, a second overflow port Y2 for discharging the waste liquid is disposed on the tower wall of the dust removal and desulfurization denitration integrated tower near the bottom of the multi-layer denitration layer A2, The nitric acid is conveniently recovered, and a fourth liquid inlet J4 is further disposed on the tower wall of the dust removal, desulfurization and denitration integrated tower of the multi-layer denitration layer A2. The liquid that enters at the third liquid inlet J3 is nitric acid, and performs a one-way rotational motion around the first gas riser S1 to drive the entire liquid to rotate and to agitate. The liquid in the multi-layer denitration layer A2 is a dilute nitric acid solution because the nitric oxide contained in the flue gas after combustion is insoluble in water but soluble in the nitric acid solution. The dilute nitric acid solution flows out of the second overflow port Y2 and enters the recovery device.

The desulfurization layer A3 has a single layer structure, and a plurality of the desulfurization layers A3 may also constitute a multi-layer desulfurization layer structure, and the denitration layer A3 includes a second tray T2, a second riser tube S2, and a second spray. a device (not shown), in order to increase the reaction area, in one embodiment, the desulfurization layer A3 further includes a second blister P2, a second foam plate M2, and the second tray T2 is disposed at the second Below the foam board M2, the second tray T2 is fixed on the tower wall of the dust removal, desulfurization and denitration integrated tower, and the second riser pipe S2 runs through the second tray T2 and the second foam board M2. The second foaming device M2 is disposed above the second foaming plate M2, and the second blister P2 is disposed above the second and second foaming plates S2 and M2. The cover edge of the second bubble cover P2 is connected to the second foam plate M2, and the fifth liquid inlet J5 is further disposed on the tower wall between the second tray T2 and the second foam plate M2. In one embodiment, a third overflow port Y3 is disposed on the tower wall of the dust removal, desulfurization and denitrification integrated tower near the bottom of the multi-layer desulfurization layer A3, and the multi-layer desulfurization is located The sixth wall of the dust removal, desulfurization and denitrification integrated tower of the layer A3 is further provided with a sixth Inlet port J6. The multi-layer desulfurization layer A3 has substantially the same structure as the multi-layer denitrification layer A2, except that the liquid in the multi-layer desulfurization layer A3 is an ash emulsion, and the ash emulsion is a solution or limestone in which limestone powder is dissolved in water. A solution obtained by dissolving powder and lime powder in water. In one embodiment it is a solution of 95% limestone powder and 5% lime powder dissolved in water. The ash emulsion reacts with the sulfur-containing gas in the flue gas to form calcium sulfate, calcium sulfite, and is oxidized by oxygen to become calcium sulfate, which is combined with water to form gypsum.

Above the multi-layer desulfurization layer A3 is a layer of steam-water separation layer A4, and a wall of the dust-removing, desulfurization and denitration integrated tower near the top of the steam-water separation layer A4 is provided with a first gas outlet Q2, into which The flue gas of the steam-water separation layer A4 is discharged into the atmosphere through the first gas outlet Q2 through the first gas outlet Q2 after passing through the steam-water separation layer A4. A seventh liquid inlet J7 is provided on the tower wall of the dust removal, desulfurization and denitrification integrated tower near the bottom of the steam-water separation layer A4 for supplementing the water washing, and the bottom of the steam-water separation layer A4 is provided with a third spray. A shower device (not shown) in which the clean water is introduced through the seventh liquid inlet J7, and the lower tower wall and the flue gas are cleaned.

In order to prolong the service life of the dust removal, desulfurization and denitrification integrated tower, the structure of the dust removal, desulfurization and denitration integrated tower is protected, the water film dust removing layer A1 is made of wear-resistant anticorrosive material, and the desulfurization layer A3 is formed by rotomolding to form an anticorrosive layer. The denitration layer A2 is made of a mixed acid anticorrosive material. The inner wall of the water film dust removing layer A1 is affixed with granite, the denitrifying layer A2 is affixed with fluoroplastic, and the desulfurized layer A3 is affixed with polypropylene. The inner chamber of the desulfurization layer A3 is blocked by fluoroplastic, and the desulfurization layer A3 has calcium sulfate, which is easy to bond, and the fluoroplastic can prevent this. The denitrification layer A2 is anticorrosive, and the chamber does not need fluoroplastic, so an anticorrosive material of mixed acid, such as dilute nitric acid and dilute sulfuric acid, is used to prepare a mixed acid anticorrosive material.

Please refer to FIG. 2. FIG. 2 is a schematic structural view of a dust removal, desulfurization and denitrification integrated system according to the present invention. As shown in FIG. 2, the present invention further provides a dust removal, desulfurization and denitrification integrated system comprising an air intake device (not shown), a purification device (not shown), and a recovery device (not shown), the intake air A device is coupled to the purification device, the purification device being coupled to the recovery device.

The air intake device includes a boiler G1 into which hot air is introduced to reduce incomplete combustion of coal. The boiler G1 is connected to the dust removal and desulfurization denitration integrated tower L1 through a pipeline. In an embodiment, the air intake device further includes an induced draft fan G2, and the induced draft fan G2 is disposed at a smoke outlet of the boiler G1 and a first air inlet Q1 of the dust removal and desulfurization denitration integrated tower L1. Between the pipes. The flue gas after combustion enters the draft fan G2 from the outlet of the boiler G1, and enters the dust removal, desulfurization and denitration integrated tower L1 through the draft fan G2. In another embodiment, an air inlet G3 is further disposed on the draft fan G2, where the air enters The mouth G3 is used for introducing air to oxidize nitrogen monoxide in the nitric acid solution in the multi-layer denitrification layer A2 in the purification device to nitrogen dioxide, and forms a nitric acid solution with water.

The purifying device comprises the dust removal, desulfurization and denitration integrated tower L1, and the outlet of the boiler G1 is connected to the first air inlet Q1 of the dust removal and desulfurization denitrification integrated tower L1 through a pipeline, and the dust removal, desulfurization and denitration integration The first air outlet Q2 of the tower L1 is connected to the chimney L2 through a pipeline. The dust removal and desulfurization denitrification integrated tower L1 includes a water film dust removing layer A1, a multilayer denitrifying layer A2, a multi-layer desulfurization layer A3 and a soda water from the bottom of the tower. The separation layer A4, since the structure of each layer of the dust removal, desulfurization and denitration integrated tower L1 has been mainly described above, will not be described herein.

A ring-shaped water spray pipe (not shown) is arranged on the top of the column B1 of the water film dust removing layer A1, and the water sprayed from the water pipe forms a water film, and the water sprayed on the tower wall falls to the tower wall and flows down to At the bottom, the tower wall is flushed to prevent impurities from condensing and accumulating on the tower wall. The column B1 located in the middle forms an annular passage with the tower wall. The water flowing in the first liquid inlet J1 at the bottom of the water film dust removing layer A1 rotates along the annular passage to drive the rotation of the entire liquid. The flue gas from the draft fan G2 enters the water film dust removing layer A1 from the first air inlet Q1. Since the column B1 forms an annular passage with the tower wall, the flue gas enters and rotates in the same direction, which drives the liquid to rotate, preventing impurities from accumulating in the dead angle and gradually forming a gel. The water film dust removing layer A1 performs preliminary dust removal on the flue gas and absorbs some nitrogen dioxide, sulfur dioxide and the like which are soluble in water.

The water entering at the third inlet port J3 of the multi-layer denitrification layer A2 performs a one-way rotational movement around the first riser pipe, and drives the entire liquid to rotate, thereby stirring. The liquid in the multi-layer denitration layer A2 is a dilute nitric acid solution because the nitric oxide contained in the flue gas after combustion is insoluble in water but soluble in the nitric acid solution. Nitric oxide dissolved in the dilute nitric acid solution is oxidized to nitrogen dioxide by oxygen contained in the air introduced from the draft fan G2, and the nitrogen dioxide reacts with water to form a dilute nitric acid solution. The dilute nitric acid solution flows out of the second overflow port Y2 and enters the first precipitation tank F3, and the clarified dilute nitric acid solution partially flows back from the fourth liquid inlet J4 to the first shower device (not shown), from which Sprayed; partially pumped to the third liquid inlet J3 under the action of the second booster pump Z2 to enter the multilayer denitration layer A2; and excess portion is used for sale.

The multi-layer desulfurization layer A3 has the same structure as the multi-layer denitrification layer A2 except that the liquid in the multi-layer desulfurization layer A3 is an ash emulsion, which is a solution obtained by dissolving 95% of limestone powder and 5% of lime powder in water. The ash emulsion reacts with the sulfur-containing gas in the flue gas to form calcium sulfate, calcium sulfite, and is oxidized by oxygen to become calcium sulfate, which is combined with water to form gypsum. The wastewater mixed with gypsum is separated from the third overflow port Y3 and then separated by the centrifuge F5, and part of the gypsum is separated for sale, and the other part is entered into the second sedimentation tank F4. The clarified water portion is further mixed with limestone powder and lime powder to form an ash emulsion, and then pumped into the second shower device through the sixth liquid inlet J6 through the ash pump. The other part of the clarified water enters the multi-layer desulfurization layer A3 from the fifth liquid inlet J5 through the first booster pump Z1, and drives the liquid to rotate to achieve the stirring effect.

In the third shower device (not shown) provided at the bottom of the steam-water separation layer A4, fresh water is introduced through the seventh liquid inlet J7, and the lower tower wall and the flue gas are cleaned. The flue gas entering the steam-water separation layer A4 is discharged to the atmosphere through the vapor-water separation layer through the stack L2.

The recovery device includes a ash slag pool F1, a stirring tank F2, a first precipitation tank F3 and a second precipitation tank F4, and the liquid inlet of the ash slag pool F1 is connected to the dust removal and desulfurization and denitration integrated tower L1 through a pipeline. The first overflow port Y1, the liquid inlet of the first precipitation tank F3 is connected to the second overflow port Y2 of the dust removal and desulfurization denitrification integrated tower L1 through a pipeline, and the liquid outlet of the first precipitation tank F3 The fourth liquid inlet J4 and the third liquid inlet J3 of the dust removal and desulfurization and denitrification integrated tower L1 are connected by a pipeline, and the liquid inlet of the second sedimentation tank F4 is connected to the dust, desulfurization and denitration through a pipeline. The third overflow port Y3 of the integrated tower L1, in another embodiment, between the third overflow port Y3 of the dust removal and desulfurization denitrification integrated tower L1 and the liquid inlet of the second precipitation tank F4 A centrifuge F5 is provided on the pipeline.

The liquid outlet of the second precipitation tank F4 is connected to the second liquid inlet J2, the first liquid inlet J1 and the fifth liquid inlet J5 of the dust removal and desulfurization denitrification integrated tower L1 through a pipeline. The liquid inlet of the agitating tank F2 is connected to the liquid outlet of the second sedimentation tank F4 through a pipeline, and the liquid outlet of the agitation tank F2 is connected to the sixth of the dust removal, desulfurization and denitration integrated tower L1 through a pipeline. The liquid inlet J6, in another embodiment, is provided with a milk pump Z3 on the pipeline between the sixth inlet J6 of the dust removal and desulfurization denitrification integrated tower L1 and the outlet of the agitation tank F2.

A second booster pump Z2 is disposed on the pipeline between the third inlet port J3 of the dust removal and desulfurization denitrification integration tower L1 and the outlet port of the first precipitation tank F3. A first booster pump Z1 is disposed on the pipeline between the fifth inlet port J5 of the dust removal and desulfurization denitrification integration tower L1 and the outlet port of the second precipitation tank F4.

The liquid outlet of the ash sump F1 is connected to the second precipitation tank F4 through a pipeline, and the pipeline between the liquid outlet of the ash sump F1 and the second precipitation tank F4 is provided with clear liquid. a pump, a bottom of the first precipitation tank F3 and the second precipitation tank F4 are provided with a discharge outlet, the waste liquid pool F1 is provided with a solid impurity inlet, and the first precipitation tank F3 and the second precipitation barrel F4 are arranged The miscellaneous outlet is connected to the solid impurity inlet of the waste liquid pool F1 through a pipeline.

The wastewater flowing out from the first overflow port Y1 of the water film dust removing layer A1 directly enters the ash pool F1 for precipitation. The wastewater flowing out from the second overflow port Y2 of the multilayer denitration layer A2 enters the first precipitation tank F3, and after the precipitation, the bottom solid impurity portion enters the ash pool F1. The nitric acid solution of the upper clarification portion is partially returned to the fourth liquid inlet J4 of the multi-layer denitration layer A2, and the first shower device that enters is partially sucked to the third liquid inlet of the denitration layer by the first booster pump Z1. J3, there are extra parts to sell. The wastewater discharged from the third overflow port Y3 of the multilayer desulfurization layer A3 is first separated and sold by a centrifuge F5, and the remaining mixed solution enters the second precipitation tank F4 together with the liquid clarified from the ash sump F1. After the precipitation, the bottom solid impurity portion enters the ash slag pool F1, and a part of the upper clarification solution enters the spray device of the water film dust removal layer A1 from the second liquid inlet port J2, that is, the annular water spray pipe, and the other portion, that is, the return water F6 passes through the first The booster pump Z1 enters the first inlet J1 of the water film dust removing layer A1 and the fifth inlet port J5 of the multilayer desulfurization layer A3, and the remaining portion enters the agitation tank F2, and contains 95% of limestone powder and 5% of lime. The powder is mixed and stirred to produce an ash emulsion, and enters the sixth liquid inlet J6 of the multilayer desulfurization layer A3 through the slick pump Z3, and then enters the second shower device.

One of ordinary skill in the art should understand that one of the features or objects of the present invention is that the integrated dust removal and desulfurization denitrification tower and the dust removal, desulfurization and denitration integrated system can solve the prior art. The waste material is more polluted, the pollution is serious, the equipment is easy to be damaged and difficult to clean, the service life is short, the waste disposal cost is high, and the problem of waste production and waste is easy. The structure improvement of the dust removal, desulfurization and denitrification integrated tower, the dust removal, desulfurization and denitration integrated system device and The improvement of the pipeline, thus treating the waste, reducing the pollution and saving the reaction raw materials, and making the equipment easy to clean, prolonging the service life and reducing the production cost.

It should be noted that the above embodiments are only used to explain the technical solutions of the present invention, and the present invention is not limited thereto. Although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be Modifications or equivalents are intended to be included within the scope of the appended claims.

Claims

The utility model relates to a dust removal, desulfurization and denitration integrated tower, characterized in that: the dust removal, desulfurization and denitrification integrated tower comprises a water film dust removal layer (A1), a denitrification layer (A2), a desulfurization layer (A3) and a steam-water separation layer from the bottom of the tower. (A4),

The water film dust removing layer (A1) includes a column (B1) fixed to the bottom of the tower, and a top of the column (B1) is provided with an annular water spout pipe near the bottom of the water film dust removing layer (A1). The first air inlet (Q1) and the first liquid inlet (J1) are disposed on a side wall of the dust removal, desulfurization and denitration integrated tower, and the dust removal, desulfurization and denitration integrated near the bottom of the water film dust removal layer (A1) The first side wall of the chemical tower is provided with a first overflow port (Y1),

The denitration layer (A2) comprises a first tray (T1), a first riser (S1) and a first shower device, and the first tray (T1) is fixed to the dust removal, desulfurization and denitration integrated tower On the wall of the tower, the first riser pipe (S1) runs through the first tray (T1), and the first shower plate (T1) is provided with the first shower device on the tower wall There is also a third inlet (J3),

The desulfurization layer (A3) comprises a second tray (T2), a second riser (S2) and a second spray device, and the second tray (T2) is fixed to the dust removal, desulfurization and denitration integrated tower On the tower wall, the second riser pipe (S2) runs through the second tray (T2), and the second shower plate (T2) is provided with the second shower device on the tower wall There is also a fifth inlet (J5).

a first air outlet (Q2) is disposed on a tower wall of the dust removal, desulfurization and denitrification integrated tower near the top of the steam-water separation layer (A4), and the dust removal, desulfurization and denitrification integration near the bottom of the steam-water separation layer is A seventh liquid inlet (J7) is provided on the tower wall of the tower, and a third spray device is disposed at the bottom of the steam-water separation layer (A4).
The dust removal, desulfurization and denitrification integrated tower according to claim 1, wherein the positions of the denitration layer (A2) and the desulfurization layer (A3) are interchanged.
The dust removal, desulfurization and denitrification integrated tower according to claim 1 or 2, wherein the denitration layer (A2) further comprises a first blister (P1) and a first foam board (M1), the first foam a plate (M1) disposed above the first tray (T1), the first riser pipe (S1) penetrating the first foam plate (M1), the first shower device being disposed at the first One Above the foam board (M1), the first bubble cover (P1) is disposed above the first riser pipe (S1) and the first foam plate (M1), the first bubble cover (P1) a hood edge connecting the first foam board (M1), the third liquid inlet (J3) being disposed between the first tray (T1) and the first foam board (M1) On the wall,

The desulfurization layer further includes a second blister (P2) and a second foam board (M2), the second foam board (M2) being disposed above the second tray (T2), the second liter a gas pipe (S2) penetrating the second foam plate (M2), the second shower device is disposed above the second foam plate (M2), and the second bubble cover (P2) is disposed at the Above the second riser pipe (S2) and the second foam plate (M2), the cover edge of the second bubble cover (P2) is connected to the second foam plate (M2), the fifth liquid inlet (J5) is disposed on the tower wall between the second tray (T2) and the second foam board (M2).
The dust removal, desulfurization and denitrification integrated tower according to claim 1 or 2, wherein the denitration layer has a plurality of desulfurization layers, and the desulfurization layer has a plurality of.
The dust removal, desulfurization and denitration integrated tower according to claim 1 or 2, wherein:

a second overflow port (Y2) is disposed on the tower wall of the dust removal, desulfurization and denitrification integrated tower near the bottom of the denitration layer, and is further disposed on the tower wall of the dust removal, desulfurization and denitrification integrated tower of the denitration layer. There is a fourth inlet (J4);

a third overflow port (Y3) is disposed on the tower wall of the dust removal, desulfurization and denitrification integrated tower near the bottom of the desulfurization layer, and is further disposed on the tower wall of the dust removal, desulfurization and denitration integrated tower of the desulfurization layer. There is a sixth inlet (J6).
The dust removal, desulfurization and denitrification integrated tower according to claim 1 or 2, wherein the denitration layer is provided with a first liquid, the first liquid is a dilute nitric acid solution, and the desulfurization layer is provided with a second The liquid, the second liquid is an ash emulsion, and the ash emulsion is a solution obtained by dissolving limestone powder in water or a solution obtained by dissolving limestone powder and lime powder in water and dissolving in water.
The dust removal, desulfurization and denitrification integrated tower according to claim 1 or 2, wherein the water film dust removing layer (A1) is made of a wear-resistant anticorrosive material, and the desulfurization layer (A3) is formed by rotomolding to form an anticorrosive layer. The denitration layer (A2) is an anticorrosive material mixed with an acid.
The dust removal, desulfurization and denitrification integrated tower according to claim 7, wherein the inner wall of the water film dust removing layer (A1) is affixed with granite, and the inner wall of the denitrifying layer (A2) is affixed with fluoroplastic, the desulfurization layer ( A3) The inner wall is provided with polypropylene, and the inner chamber of the desulfurization layer (A3) is prevented from blocking by fluoroplastic.
An integrated system for dust removal, desulfurization and denitrification, comprising: an air intake device, a purification device and a recovery device, wherein the air intake device is connected to the purification device, and the purification device is connected to the recovery device,

The purification device includes the dust removal, desulfurization and denitration integrated tower according to claim 1-8, and the outlet of the air intake device is connected to the first air inlet of the dust removal, desulfurization and denitration integrated tower through a pipeline. The first air outlet of the dust removal and desulfurization denitration integrated tower is connected to the chimney through a pipeline.
The integrated system for dust removal, desulfurization and denitrification according to claim 9, wherein the recovery device comprises a ash pool, a stirring tank, a first sedimentation tank and a second sedimentation tank, and the inlet of the ash tank passes through a pipeline connecting the first overflow port of the dust removal, desulfurization and denitration integrated tower, wherein the liquid inlet of the first sedimentation tank is connected to the second overflow port of the dust removal, desulfurization and denitration integrated tower through a pipeline, the first a liquid outlet of a sedimentation tank is connected to the fourth liquid inlet of the dust removal and desulfurization denitration integrated tower and the third liquid inlet through a pipeline, and the liquid inlet of the second sedimentation tank is connected by a pipeline a third overflow port of the dust removal and desulfurization denitration integrated tower, wherein the liquid outlet of the second settling tank is connected to the second liquid inlet of the dust removal and desulfurization and denitration integrated tower through a pipeline, the first liquid inlet and The fifth liquid inlet, the liquid inlet of the agitating tank is connected to the liquid outlet of the second sedimentation tank through a pipeline, and the liquid outlet of the agitating tank is connected to the dust, desulfurization and denitrification through a pipeline The sixth inlet of the tower.
The integrated system for dust removal, desulfurization and denitrification according to claim 10, wherein the air intake device further comprises an induced draft fan, and the induced draft fan is disposed at a smoke outlet of the boiler and the dust removal, desulfurization and denitration integrated tower On the pipeline between the first air inlets, an air inlet is also disposed on the induced draft fan.
The integrated system for dust removal, desulfurization and denitrification according to claim 9, wherein: the third liquid inlet of the dust removal, desulfurization and denitrification integrated tower and the outlet of the first precipitation tank a second booster pump is disposed on the pipeline between the liquid ports; a centrifuge is disposed on the pipeline between the third overflow port of the dust removal and desulfurization denitration integrated tower and the liquid inlet of the second sedimentation tank; a first booster pump is arranged on the pipeline between the fifth liquid inlet of the dust removal and desulfurization denitrification integrated tower and the liquid outlet of the second sedimentation tank; the sixth of the dust removal, desulfurization and denitration integrated tower A milk pump is disposed on the pipeline between the liquid port and the liquid outlet of the agitation tank.
The integrated system for dust removal, desulfurization and denitrification according to claim 9, wherein the liquid outlet of the ash pool is connected to the second sedimentation tank through a pipeline, and the liquid outlet of the ash pool is a clear liquid pump is disposed on the pipeline between the second sedimentation tanks, and the bottom of the first sedimentation tank and the second sedimentation tank are provided with a discharge outlet, and the waste liquid pool is provided with a solid impurity inlet, the first A sedimentation tank and a second sedimentation tank discharge outlet are connected to the solid impurity inlet of the waste liquid tank through a pipeline.