CN215311322U

CN215311322U - A chemical exhaust gas treatment device

Info

Publication number: CN215311322U
Application number: CN202121029283.4U
Authority: CN
Inventors: 于佳佳; 贺三林; 窦宝刚; 窦海雷; 胡斌; 闪小兵; 王跃进
Original assignee: JIAOZUO RUNHUA CHEMICAL INDUSTRY CO LTD
Current assignee: JIAOZUO RUNHUA CHEMICAL INDUSTRY CO LTD
Priority date: 2021-05-13
Filing date: 2021-05-13
Publication date: 2021-12-28
Anticipated expiration: 2031-05-13

Abstract

The utility model relates to the technical field of chemical tail gas treatment equipment, and discloses a chemical tail gas treatment device. The tail gas treatment device comprises an absorption tower body, a packing layer installed in the absorption tower body, and a circulating spray component; the circulating spray component includes a circulating pipe , Connect the branch pipe A and the spray assembly A; the spray assembly A includes the concentric annular pipe A and the annular pipe B. The utility model has the advantages of simple structure and convenient operation; the spray component A of the utility model can prolong the stay time of the tail gas in the absorption tower body and improve the absorption efficiency of ammonia gas; the spray component B can spray cooling water to reduce the absorption tower body The temperature inside, improve the absorption efficiency of ammonia gas.

Description

Chemical industry tail gas processing apparatus

Technical Field

The utility model relates to the technical field of chemical tail gas treatment equipment, in particular to a chemical tail gas treatment device.

Background

Urotropine is widely used in resin, plastic, rubber and other industries, synthetic resin as hardening agent, phenolphthalein plastic as curing agent, aminoplast as catalyst, rubber industry as vulcanization accelerator and textile industry as antishrinking agent. Since urotropin has a dissolving effect on uric acid, urotropin is pharmaceutically useful as a diuretic. In the food industry, urotropin is used as a disinfectant and many amino compounds can be synthesized. Can be used as raw material for preparing pesticide in agriculture. Mixing with caustic soda and phenol can be used as phosgene absorbent for gas masks.

The main raw materials for producing urotropine comprise formaldehyde and ammonia, and the production process comprises a liquid phase method and a gas phase method. The gas phase process of producing urotropine includes the direct reaction of formaldehyde gas produced through the conversion of methanol in ammoniation reactor and ammonia gas in saturated mother liquid of urotropine to produce urotropine. In the actual production process, in order to make the reaction proceed toward the direction of producing urotropine and avoid the influence of side reaction on the product quality and consumption, the reaction temperature is controlled well and the excess ammonia is ensured, namely free ammonia exists in the reaction liquid, so that the generation of reverse reaction can be prevented and the generation of trimethylamine can be resisted.

The tail gas after the production of the urotropine contains inert gas, water vapor and ammonia which is not completely reacted, most of the ammonia and the water vapor pass through an ammonia absorption tower, are absorbed by circulating liquid and enter an ammonia water liquid seal tank, and the unabsorbed ammonia and the inert gas pass through a gas cooler and then are sent into a tail gas boiler by a vacuum pump to be combusted.

In the prior art, the retention time of the tail gas in the ammonia absorption tower is short, so that the ammonia absorption tower has low ammonia absorption efficiency; and the process of ammonia absorption is an exothermic process, and when the temperature in the ammonia absorption tower rises, the solubility of ammonia in water also decreases, so that the absorption efficiency of ammonia is further reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the technical problems in the prior art and provides a chemical tail gas treatment device.

In order to achieve the purpose, the utility model is implemented according to the following technical scheme:

a chemical tail gas treatment device comprises an absorption tower body, a packing layer and a circulating spray assembly, wherein the packing layer and the circulating spray assembly are arranged in the absorption tower body; the top of the absorption tower body is provided with an exhaust port, and the lower part of the absorption tower body is communicated with a tail gas inlet pipe, a liquid discharge pipe and a water inlet pipe;

the circulating spraying assembly comprises a circulating pipe, a connecting branch pipe A and a spraying assembly A; the tail part of the circulating pipe is communicated with the lower part of the absorption tower body; the connecting branch pipe A penetrates through the side wall of the absorption tower body and extends into the absorption tower body; a spraying component A is arranged above each packing layer and is communicated with the circulating pipe through a connecting branch pipe A;

the spraying assembly A comprises a concentric annular pipe A and a concentric annular pipe B; the annular pipe A is positioned at the inner side of the ring of the annular pipe B; the annular pipe A and the annular pipe B are both communicated with the connecting branch pipe A; the lower end surfaces of the annular pipe A and the annular pipe B are communicated with a plurality of spray heads; a disc-shaped filter plate A is arranged on the inner side of the ring pipe A, an annular filter plate B is arranged between the ring pipe A and the ring pipe B, and an annular filter plate C is arranged between the ring pipe B and the side wall of the absorption tower body.

Preferably, the tail gas treatment device further comprises a cooling water spraying assembly; the cooling water spray assembly comprises a water inlet main pipe, a connecting branch pipe B and a spray assembly B; the water inlet main pipe is communicated with a cooling water source; the connecting branch pipe B penetrates through the side wall of the absorption tower body and extends into the absorption tower body; a spray component B is arranged above each spray component A and is communicated with the water inlet main pipe through a connecting branch pipe B;

the spraying component B comprises a concentric annular pipe C, an annular pipe D and an annular pipe E; the annular pipe C, the annular pipe D and the annular pipe E are communicated with the connecting branch pipe B; the lower end surfaces of the annular pipe C, the annular pipe D and the annular pipe E are communicated with a plurality of spray heads; the annular pipe C, the annular pipe D and the annular pipe E are connected through a connecting rod.

Preferably, the projection of the annular pipe E falls on the filter plate C, the projection of the annular pipe D falls on the filter plate B, and the projection of the annular pipe C does not exceed the ring outer side of the annular pipe A; the water inlet pipe is communicated with the water inlet main pipe.

Preferably, valves are arranged on the connecting branch pipe A, the connecting branch pipe B, the tail gas inlet pipe, the liquid discharge pipe and the water inlet pipe.

Utility model's principle of action:

when the absorbing tower is used, tail gas containing ammonia gas in the production process of urotropine enters the absorbing tower body from the tail gas inlet pipe, the ammonia gas is absorbed by water, the absorbed gas is discharged from the exhaust port, the ammonia water obtained after absorption is discharged from the liquid discharge pipe, and then the next step of treatment is carried out.

The circulating spraying component of the utility model mainly comprises a circulating pump which extracts the spraying liquid which is absorbed with partial ammonia gas at the bottom of the absorption tower body for circulating spraying. The spraying component A of the circulating spraying component is provided with a ring pipe A and a ring pipe B which can be used for spraying, a filter plate A, a filter plate B and a filter plate C, the filter plate plays a role in blocking, and the time of the tail gas staying in the absorption tower body can be effectively prolonged by combining the sprayed liquid and the packing layer, so that the ammonia in the tail gas is contacted with the sprayed liquid as far as possible and is absorbed by the sprayed liquid, and the absorption efficiency of the ammonia in the tail gas is improved.

The spray component B in the cooling water spray component can mainly supplement cooling water with low temperature, and the cooling water can reduce the temperature inside the absorption tower body and reduce spray liquid with raised temperature after ammonia gas is absorbed, so that the ammonia gas keeps higher solubility. Meanwhile, the spray liquid needs to be discharged after being absorbed to a certain degree, and the spray assembly B can be used for supplementing the required spray liquid. The cooling water which does not absorb ammonia is arranged above the spraying component A, so that the absorption effect on the residual ammonia in the tail gas is better. The cold water is sprayed from the top, and the spray liquid in the packing layer can be directly diluted and cooled, so that the ammonia can be absorbed more quickly and effectively, and the absorption efficiency of the ammonia is improved.

The undefined components in the present invention all adopt the conventional means in the art, for example, the absorption tower body, the ring pipe, the filter plate, the circulation pump, the valve, etc. are all selected from those commonly used in the art, and those skilled in the art can select the model and the installation mode thereof according to the actual use requirement, and clearly understand how to install and control the components, and will not be described in detail herein. The size of the filter plate pores is selected according to the actual use requirements, is well known to those skilled in the art, and is not limited herein.

The utility model has the beneficial effects that:

the utility model has simple structure and convenient operation; the spraying assembly A can prolong the retention time of the tail gas in the absorption tower body and improve the absorption efficiency of ammonia gas; the spraying component B can spray cooling water, reduce the temperature in the absorption tower body and improve the absorption efficiency of ammonia gas.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of the spray assembly A of FIG. 1;

FIG. 3 is a top view of the spray assembly B of FIG. 1;

fig. 4 is an enlarged view at E in fig. 1.

In the figure: 1. an absorption tower body; 2. a filler layer; 3. an exhaust port; 4. introducing tail gas into a pipe; 5. a liquid discharge pipe; 6. a water inlet pipe; 7. a circulation pipe; 8. connecting the branch pipe A; 9. a circulation pump; 10. an annular tube A; 11. an annular tube B; 12. a spray head; 13. a filter plate A; 14. a filter plate B; 15. a filter plate C; 16. a water inlet main pipe; 17. connecting a branch pipe B; 18. an annular tube C; 19. an annular tube D; 20. an annular tube E; 21. a connecting rod.

Detailed Description

The utility model will be further described with reference to the drawings and specific embodiments, which are illustrative of the utility model and are not to be construed as limiting the utility model.

Example 1

As shown in fig. 1 to 4, a chemical tail gas treatment device comprises an absorption tower body 1, two packing layers 2 arranged in the absorption tower body 1, and a circulating spray assembly; the top of the absorption tower body 1 is provided with an exhaust port 3, and the lower part of the absorption tower body is communicated with a tail gas inlet pipe 4, a liquid discharge pipe 5 and a water inlet pipe 6.

The circulating spray assembly comprises a circulating pipe 7, a connecting branch pipe A8 and a spray assembly A; the tail part of the circulating pipe 7 is communicated with the lower part of the absorption tower body 1; the connecting branch pipe A8 penetrates through the side wall of the absorption tower body 1 and extends into the absorption tower body 1; a spraying component A is arranged above each packing layer 2 and is communicated with the circulating pipe 7 through a connecting branch pipe A8. The circulation pipe 7 is provided with a circulation pump 9.

The spraying assembly A comprises a concentric annular pipe A10 and an annular pipe B11; annular tube a10 is located inside the ring of annular tube B11; the annular pipe A10 and the annular pipe B11 are both communicated with a connecting branch pipe A8; the lower end surfaces of the annular pipe A10 and the annular pipe B11 are communicated with a plurality of spray heads 12; a disc-shaped filter plate A13 is mounted on the inner side of the ring pipe A10, a ring-shaped filter plate B14 is mounted between the ring pipe A10 and the ring pipe B11, and a ring-shaped filter plate C15 is mounted between the ring pipe B11 and the side wall of the absorption tower body 1.

The tail gas treatment device also comprises a cooling water spraying assembly; the cooling water spray assembly comprises a water inlet main pipe 16, a connecting branch pipe B17 and a spray assembly B; the water intake manifold 16 is in communication with a source of cooling water (not shown); the connecting branch pipe B17 penetrates through the side wall of the absorption tower body 1 and extends into the absorption tower body 1; and a spray assembly B is arranged above each spray assembly A and is communicated with the water inlet main pipe 16 through a connecting branch pipe B17.

The spray assembly B comprises a concentric annular pipe C18, an annular pipe D19 and an annular pipe E20; the annular pipe C18, the annular pipe D19 and the annular pipe E20 are all communicated with the connecting branch pipe B17; the lower end surfaces of the annular pipe C18, the annular pipe D19 and the annular pipe E20 are communicated with a plurality of spray heads 12; the ring pipe C18, the ring pipe D19, and the ring pipe E20 are connected by a connecting rod 21.

The projection of the annular pipe E20 falls on the filter plate C15, the projection of the annular pipe D19 falls on the filter plate B14, and the projection of the annular pipe C18 does not exceed the ring outer side of the annular pipe A10; the inlet pipe 6 communicates with the inlet manifold 16.

Valves are arranged on the connecting branch pipe A8, the connecting branch pipe B17, the tail gas inlet pipe 4, the liquid discharge pipe 5 and the water inlet pipe 6.

The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. a chemical tail gas treatment device, the tail gas treatment device comprises an absorption tower body, a packing layer installed in the absorption tower body, a circulating spray assembly; the top of the absorption tower body has an exhaust port, and the bottom of the absorption tower body is communicated There are exhaust gas inlet pipe, liquid discharge pipe and water inlet pipe; it is characterized in that:

The circulating spray assembly includes a circulating pipe, a connecting branch pipe A, and a spraying assembly A; the tail of the circulating pipe is communicated with the lower part of the absorption tower body; the connecting branch pipe A penetrates the side wall of the absorption tower body and extends into the absorption tower body; There is a spray component A above each packing layer, and the spray component A is communicated with the circulation pipe through the connecting branch pipe A;

The spray assembly A includes a concentric annular pipe A and an annular pipe B; the annular pipe A is located inside the ring of the annular pipe B; the annular pipe A and the annular pipe B are both communicated with the connecting branch pipe A; The end faces are connected with a plurality of nozzles; a disc-shaped filter plate A is installed on the inner side of the ring of the annular pipe A, an annular filter plate B is installed between the annular pipe A and the annular pipe B, and the annular pipe B is connected to the side wall of the absorption tower body. An annular filter plate C is installed between them.

2. A chemical exhaust gas treatment device according to claim 1, characterized in that: the exhaust gas treatment device further comprises a cooling water spray assembly; the cooling water spray assembly comprises a water inlet main pipe, a connecting branch pipe B, and a spray assembly B; The inlet water main pipe is communicated with the cooling water source; the connecting branch pipe B runs through the side wall of the absorption tower body and extends into the absorption tower body; there is a spraying assembly B above each spraying assembly A, and the spraying assembly B passes through the connecting branch pipe B Connected to the inlet mains;

The spray assembly B includes concentric annular pipes C, annular pipes D, and annular pipes E; the annular pipes C, annular pipes D, and annular pipes E are all communicated with the connecting branch pipe B; The end faces are connected with a plurality of nozzles; the annular pipe C, the annular pipe D, and the annular pipe E are connected by connecting rods.

3. a kind of chemical tail gas treatment device according to claim 2 is characterized in that: the projection of annular pipe E falls on filter plate C, the projection of annular pipe D falls on filter plate B, and the projection of annular pipe C does not fall on filter plate B. Beyond the ring outside of the ring pipe A; the water inlet pipe is connected to the water inlet main pipe.

4 . A chemical exhaust gas treatment device according to claim 3 , wherein the connecting branch pipe A, the connecting branch pipe B, the exhaust gas inlet pipe, the liquid discharge pipe and the water inlet pipe have valves. 5 .