A calcination tail gas desulfurization device

Abstract

The utility model discloses a calcination tail gas desulfurization device belongs to environmental protection equipment technical field, and this device includes venturi, box and tower body, and venturi includes first inlet pipe, first liquid inlet pipe and first outlet pipe, and the first circulating pump is connected on the box, and the first circulating pump is connected with first liquid inlet pipe, and the second outlet pipe is equipped on the box, and the second outlet pipe is communicated with tower body through intermediate pipe, and the box is equipped with the partition net board, and the partition net board divides the box into the first space of upper side and the second space of lower side, and a plurality of filling balls are equipped in the first space. The utility model discloses venturi to improve the dust removal and desulfurization effect to tail gas, reduce the subsequent processing of filling blockage and treatment liquid load, reduce the operation cost, after the preliminary treatment of venturi and box, the dust removal rate is high, reduces the filling blockage risk in the subsequent tower body, and the desulfurization efficiency is high, and the tail gas purification effect is good and prolongs the spray tower service life.

Description

Technical Field

[0001] This utility model belongs to the field of environmental protection equipment technology, specifically relating to a desulfurization device for calcination tail gas. Background Technology

[0002] Calcination tail gas refers to the exhaust gas emitted from high-temperature calcination equipment such as rotary kilns and lime kilns. The tail gas usually contains pollutants such as sulfur-containing gases and dust. Currently, calcination tail gas is usually treated for dust removal and desulfurization by alkaline spray towers. However, the dust particles in the calcination tail gas reduce the contact area between sulfur dioxide and alkaline solution and inhibit the chemical reaction, affecting the desulfurization efficiency. The dust particles can also form viscous substances with the solution, causing nozzle blockage in the spray pipeline. They can also cause wear and corrosion to the circulating pump and spray pipeline components of the spray tower, increasing operating costs and reducing equipment lifespan. Utility Model Content

[0003] The technical problem solved by this utility model is to provide a desulfurization device for calcination tail gas to improve the efficiency of removing dust particles from the tail gas.

[0004] Technical solution: To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A desulfurization device for calcination tail gas includes a venturi tube, a housing connected to the venturi tube, and a tower connected to the housing. The venturi tube includes a first inlet pipe, a first liquid inlet pipe, and a first outlet pipe. A first circulation pump is connected to the housing and is connected to the first liquid inlet pipe. A second outlet pipe is provided on the housing and communicates with the tower through an intermediate pipe. A partition mesh plate is provided inside the housing, dividing the housing into an upper first space and a lower second space. A plurality of packing balls are provided in the first space.

[0006] Furthermore, the box is provided with a guide pipe that communicates with the first air outlet pipe, and the lower end of the guide pipe is an outlet.

[0007] Furthermore, the housing is provided with a first spray pipe that is connected to the first circulating pump, and the first spray pipe is provided with a plurality of first nozzles, the first nozzles facing the packing ball.

[0008] Furthermore, the venturi tube is provided with a second air inlet pipe, which is connected to the intermediate tube through a second branch pipe, and the second branch pipe is provided with a return air valve.

[0009] Furthermore, the inlet end of the first circulating pump is connected to the housing through a first circulating pipe, and the inlet end of the first circulating pump is connected to the tower through a second circulating pipe.

[0010] Furthermore, the tower body is provided with a second spray pipe, which is connected to a second circulating pump, and the tower body is provided with a second packing layer corresponding to the second spray pipe.

[0011] Furthermore, the lower end outlet height of the guide tube is lower than that of the second air outlet tube.

[0012] Furthermore, the filling ball is a multi-faceted hollow sphere.

[0013] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0014] 1. By setting up a venturi tube, box and tower, the calcination tail gas is pretreated in the venturi tube. By setting up a first circulation pump, the solution circulating in the venturi tube improves the dust removal and desulfurization effect on the tail gas, reduces the packing blockage and the burden of treatment solution in subsequent treatment, and reduces operating costs.

[0015] 2. The chamber is equipped with a partition mesh plate and packing balls, and is also equipped with a first spray pipe to further improve the removal rate of particulate dust in the exhaust gas. At the same time, the packing balls can prolong the gas-liquid contact time and improve the desulfurization efficiency.

[0016] 3. The box body is connected to the tower body through the intermediate pipe. A second air inlet pipe is installed on the venturi tube. The second air inlet pipe is connected to the intermediate pipe through the second branch pipe. Part of the airflow in the intermediate pipe flows back to the venturi tube, so that the calcination tail gas entering through the first air inlet pipe diffuses more fully, reacts better with liquid droplets, and has higher dust removal efficiency.

[0017] 4. After preliminary treatment by the Venturi tube and the box, the dust removal rate is high, reducing the risk of packing blockage in the subsequent tower, resulting in high desulfurization efficiency, good tail gas purification effect, and extended service life of the spray tower. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the device according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the Venturi tube and box structure in the embodiment;

[0020] Figure 3 This is a schematic diagram of the box structure of the embodiment;

[0021] Figure 4 This is a schematic diagram of the tower structure in an embodiment. Detailed Implementation

[0022] The present invention will be further illustrated below with reference to specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0023] like Figure 1 and Figure 2 As shown, a desulfurization device for calcination tail gas includes a venturi tube 1, a housing 2, and a tower 3. The venturi tube 1 is vertically arranged and consists of a converging section, a throat section, and a diverging section from top to bottom. The venturi tube 1 includes a first air inlet pipe 11, a first liquid inlet pipe 12, and a first air outlet pipe 13. The first air inlet pipe 11 is connected to the side wall of the converging section. The first liquid inlet pipe 12 is connected to the converging section from the top and extends to the converging section from the bottom. The first air outlet pipe 13 is the diverging section. The external calcination tail gas enters the venturi tube 1 from the first air inlet pipe 11.

[0024] like Figure 1 , Figure 2 and Figure 3 As shown, the box 2 is a rectangular box. The lower end of the first vent pipe 13 of the Venturi tube 1 is connected to the top of the box 2. The box 2 is equipped with a partition mesh 23, which is arranged horizontally. The partition mesh 23 divides the box 2 into an upper first space 201 and a lower second space 202. The partition mesh 23 has multiple perforations, so that the first space 201 and the second space 202 are interconnected. The box 2 is equipped with a guide tube 21, which extends downward from the top of the box 2. The guide tube 21 is located in the first space 201. The upper end of the guide tube 21 is connected to the outlet of the first vent pipe 13, and the lower end of the guide tube 21 is the outlet. The lower end of the guide tube 21 is also equipped with a second outlet to facilitate gas flow. A second vent pipe 22 is provided on one side of the box 2. The second vent pipe 22 is located at the upper position of the side wall of the box 2. The lower end of the guide tube 21 is lower than the height of the second vent pipe 22. The second exhaust pipe 22 is connected to the first space 201. The second space 202 stores an alkaline solution, such as lime milk (Ca(OH)2 suspension). The first circulation pump 4 is connected to the box body 2. The inlet end of the first circulation pump 4 is connected to the box body 2 through the first circulation pipe 41. The connection point between the first circulation pipe 41 and the box body 2 is located at the lower part of the side wall of the box body 2, so that the first circulation pipe 41 can pump out the lime milk stored in the second space 202. The outlet end of the first circulation pump 4 is connected to the first inlet pipe 12 through the first discharge pipe 43. The pumped lime milk enters the venturi tube 1 from the first inlet pipe 12. Inside the venturi tube 1, the calcination tail gas is accelerated at the throat section. The calcination tail gas and the atomized droplets of lime milk come into full contact, which can remove particulate matter in the tail gas. In addition, the sulfur dioxide in the tail gas reacts fully with the lime milk, resulting in high desulfurization efficiency and reducing the temperature of the calcination tail gas.

[0025] like Figure 1 , Figure 2 and Figure 3As shown, the gas-liquid mixture of calcination tail gas and alkaline solution droplets after passing through Venturi tube 1 enters the chamber 2 through guide pipe 21. Multiple packing balls 24 are installed in the first space 201 of chamber 2. The packing balls 24 are multi-faceted hollow spheres made of polytetrafluoroethylene (PTFE), which is resistant to high temperatures and acids / alkalis. A first spray pipe 25 is installed inside chamber 2, located below the partition mesh plate 23. Multiple first nozzles 251 are installed on the first spray pipe 25, pointing upwards towards the packing balls 24. The first spray pipe 25 is connected to the first circulating pump 4 via the second discharge pipe 44. The outlet end is connected, and a second discharge valve is installed on the second discharge pipe 44. When the second discharge valve is opened, the first circulating pump 4 transports lime slurry to the first spray pipe 25 and sprays it out from the first nozzle 251. The lime slurry is sprayed onto multiple packing balls 24 above. When the calcination tail gas in the box 2 passes through the packing balls 24, it is subjected to the dual action of the droplets from the first nozzle 251 and the packing balls. On the one hand, the droplets collide with the dust in the tail gas, thereby carrying down the particulate dust in the tail gas. The liquid film on the surface of the packing balls 24 can adsorb fine particles, further improving the particulate dust removal rate. At the same time, the packing balls 24 can prolong the gas-liquid contact time and improve the desulfurization efficiency. The calcination tail gas after passing through the packing balls 24 is discharged from the box 2 through the second outlet pipe 22.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, the tower body 3 is connected to the box body 2. The tower body 3 is cylindrical in shape. A third air inlet pipe 31 is provided on the lower side wall of the tower body 3, and a third air outlet pipe 32 is provided on the top of the tower body 3. The second air outlet pipe 22 is connected to the third air inlet pipe 31 of the tower body 3 through the intermediate pipe 5. The calcination exhaust gas is discharged from the box body 2 through the second air outlet pipe 22 and then enters the tower body 3 through the intermediate pipe 5. A second air inlet pipe 14 is provided on the Venturi tube 1. The second air inlet pipe 14 is connected to the throat section. The second air inlet pipe 14 is connected to the intermediate pipe 5 through the second branch pipe 15. A return air valve 151 is provided on the second branch pipe 15. After the return air valve 151 is opened, some gas in the intermediate pipe 5 returns to the Venturi tube 1 from the second branch pipe 15 and the second air inlet pipe 14, so that the calcination exhaust gas entering through the first air inlet pipe 11 diffuses more fully, reacts better with liquid droplets, and has higher dust removal efficiency. The tower body 3 also stores an alkaline solution, such as lime milk. The inlet of the first circulation pump 4 is connected to the tower body 3 through the second circulation pipe 42. The second circulation pipe 42 is equipped with a second feed valve. When the second feed valve is opened, the first circulation pump 4 can transport the alkaline solution in the tower body 3 to the first liquid inlet pipe 12 and the first spray pipe 25. The first circulation pump 4 can choose to circulate the alkaline solution in the tank 2 or the alkaline solution in the tower body 3, and can exchange the alkaline solutions in the tank 2 and the tower body 3.

[0027] like Figure 1 and Figure 4As shown, a circulation tank 7 is connected to the tower body 3. The circulation tank 7 is located on the side of the tower body 3 and communicates with the bottom space of the tower body 3. The alkaline solution flows in the bottom of the tower body 3 and in the circulation tank 7. A second circulation pump 62 is provided on the circulation tank 7. The inlet end of the second circulation pump 62 extends into the circulation tank 7 through a pipeline. Three second spray pipes 61 are provided on the tower body 3. The three second spray pipes 61 are arranged sequentially from top to bottom in the tower body 3. The second spray pipes 61 are connected to the second circulation pump 62 through the spray main pipe 621. Multiple second nozzles 611 are provided on the second spray pipes 61. The second nozzles 611 are set downward. When the second circulation pump 62 is working, it delivers the alkaline solution to the second nozzles 611 and sprays it out. The tower body 3 has three second packing layers 63, each corresponding to a second spray pipe 61. Each second packing layer 63 is located below its corresponding second spray pipe 61. The second packing layers 63 utilize existing ceramic packing, polypropylene multi-faceted hollow spheres, or polyethylene garland packing to increase the gas-liquid contact area and promote the absorption of sulfur dioxide in the exhaust gas. After entering the tower body 3, the exhaust gas passes upward through multiple second packing layers 63 and second spray pipes 61 for spraying treatment. A demister 65 is installed at the top of the tower body 3. The demister 65 uses existing wire mesh demisters or baffle demisters. The upward airflow passes through the demister 65 and exits the tower body 3 through the third outlet pipe 32, entering subsequent treatment processes, such as re-entering an electrostatic demister.

[0028] like Figure 4 As shown, the circulation box 7 is also equipped with an air pipe 71, which extends from the circulation box 7 to the bottom of the tower body 3. The air pipe 71 is equipped with multiple air branch pipes 711, and the air branch pipes 711 are equipped with multiple air holes. The air pipe 71 is used to introduce external air into the alkaline solution, so as to realize the regeneration and circulation of alkaline desulfurization slurry through oxidation reaction, thereby maintaining the continuous desulfurization capacity of the entire device. In addition, the air agitates the solution in the tower body 1, prevents the solution from settling, and ensures the reaction effect.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A desulfurization device for calcination tail gas, characterized in that, The device includes a venturi tube (1), a housing (2) connected to the venturi tube (1), and a tower body (3) connected to the housing (2). The venturi tube (1) includes a first air inlet pipe (11), a first liquid inlet pipe (12), and a first air outlet pipe (13). A first circulation pump (4) is connected to the housing (2), and the first circulation pump (4) is connected to the first liquid inlet pipe (12). A second air outlet pipe (22) is provided on the housing (2), and the second air outlet pipe (22) is connected to the tower body (3) through an intermediate pipe (5). A partition mesh plate (23) is provided inside the housing (2), and the partition mesh plate (23) divides the housing (2) into an upper first space (201) and a lower second space (202). A plurality of packing balls (24) are provided in the first space (201).

2. The desulfurization device for calcination tail gas according to claim 1, characterized in that, The housing (2) is provided with a guide pipe (21) that communicates with the first air outlet pipe (13), and the lower end of the guide pipe (21) is the outlet.

3. The desulfurization device for calcination tail gas according to claim 2, characterized in that, The housing (2) is provided with a first spray pipe (25) that is connected to the first circulating pump (4). The first spray pipe (25) is provided with a plurality of first nozzles (251), and the first nozzles (251) face the packing ball (24).

4. The desulfurization device for calcination tail gas according to claim 1, characterized in that, The Venturi tube (1) is provided with a second air inlet pipe (14), which is connected to the intermediate pipe (5) through a second branch pipe (15). The second branch pipe (15) is provided with a return air valve (151).

5. The desulfurization device for calcination tail gas according to claim 1, characterized in that, The inlet end of the first circulating pump (4) is connected to the box (2) through the first circulating pipe (41), and the inlet end of the first circulating pump (4) is connected to the tower (3) through the second circulating pipe (42).

6. The desulfurization device for calcination tail gas according to claim 1, characterized in that, The tower body (3) is provided with a second spray pipe (61), which is connected to a second circulating pump (62). The tower body (3) is provided with a second packing layer (63) corresponding to the second spray pipe (61).

7. The desulfurization device for calcination tail gas according to claim 2, characterized in that, The lower end outlet height of the guide tube (21) is lower than that of the second air outlet tube (22).

8. The desulfurization device for calcination tail gas according to claim 1, characterized in that, The filler ball (24) is a multi-faceted hollow ball.

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