Absorption device for qualified emission of NOx in adipic acid tail gas

Abstract

The utility model discloses an absorption device for qualified discharge of NOx in adipic acid tail gas, which comprises a first absorption tower, a second absorption tower, a third absorption tower, a compressor and a discharge chimney, the first absorption tower and the second absorption tower are connected to a first inlet pipeline of the discharge chimney in parallel through a first absorption tower outlet pipeline and a second absorption tower outlet pipeline respectively, an inlet of the compressor is provided with a first compressor inlet pipeline and a second compressor inlet pipeline, an outlet of the compressor is connected with the third absorption tower, and an outlet of the third absorption tower is connected with a second inlet pipeline of the discharge chimney. A first absorption tower outlet bypass pipeline and a second absorption tower outlet bypass pipeline are respectively arranged on the first absorption tower outlet pipeline and the second absorption tower outlet pipeline in a branching manner and are connected to the first compressor inlet pipeline in parallel through pipelines. And unqualified NOx in the tail gas is discharged after being absorbed again by the absorption tower instead of being discharged by an original discharge chimney, so that the problem of unqualified tail gas discharge of the device is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tail gas emission device, specifically relates to a kind of for adipic acid tail gas NO x Absorption device of qualified emission. BACKGROUND

[0002] In the production process of adipic acid, the production process of nitric acid catalytic oxidation cyclohexanol is generally used, and a large amount of nitrous gas is inevitably generated in the production process.In the production process of adipic acid, the tail gas composition mainly includes: nitrous oxide, nitrogen, and also residual oxygen, carbon oxide, water vapor, NO x Etc. After process treatment, NO x Is recycled and used, which reduces the consumption of nitric acid to a certain extent, and the production tail gas can be discharged up to standard.But the production tail gas still contains a certain amount of nitrogen oxides, which has a certain impact on the environment, therefore, reducing the content of nitrogen oxides in adipic acid production tail gas and realizing energy saving and emission reduction are the current goals of adipic acid production process.

[0003] The tail gas absorption and emission system of adipic acid device is a relatively mature tail gas absorption and emission system, but with the increasingly severe environmental protection situation, the existing tail gas emission index has exceeded the environmental protection qualified index, and has not met the environmental protection emission requirements. CONTENT OF UTILITY MODEL

[0004] Therefore, in order to solve the above problems, the utility model provides an absorption device for qualified emission of adipic acid tail gas NO x .

[0005] Based on the above purpose, the utility model adopts the following technical scheme:

[0006] An absorption device for qualified emission of adipic acid tail gas NO x , comprising a first absorption tower, a second absorption tower, a third absorption tower, a compressor and a discharge chimney, the discharge chimney is provided with a first inlet pipeline and a second inlet pipeline, the first absorption tower and the second absorption tower are connected in parallel on the first inlet pipeline of the discharge chimney through a first absorption tower outlet pipeline and a second absorption tower outlet pipeline respectively, the inlet of the compressor is provided with a first compressor inlet pipeline and a second compressor inlet pipeline, the outlet of the compressor is connected with the third absorption tower, the outlet of the third absorption tower is connected with the second inlet pipeline of the discharge chimney, a first absorption tower outlet bypass pipeline and a second absorption tower outlet bypass pipeline are respectively arranged on the first absorption tower outlet pipeline and the second absorption tower outlet pipeline, and the first absorption tower outlet bypass pipeline and the second absorption tower outlet bypass pipeline are connected in parallel on the first compressor inlet pipeline through pipelines.

[0007] Further, two air induction fans are arranged in parallel on the first absorption tower outlet pipeline, and an air induction fan is arranged on the second absorption tower outlet pipeline.

[0008] Furthermore, the first compressor inlet pipeline is equipped with a compressor inlet valve and a compressor inlet check valve, and the second compressor inlet pipeline is connected to the existing adipic acid production exhaust gas device.

[0009] Furthermore, valves are installed on the outlet pipeline of the first absorption tower, the outlet pipeline of the second absorption tower, the outlet bypass pipeline of the first absorption tower, the outlet bypass pipeline of the second absorption tower, and the first inlet pipeline.

[0010] This invention adopts the aforementioned operating system, which is reliable and easy to operate, solving the problem of substandard exhaust gas emissions from current devices and addressing existing issues in the technology. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Wherein: 1-First absorption tower outlet pipeline, 2-First absorption tower bypass pipeline, 3-Second absorption tower bypass pipeline, 4-Second absorption tower outlet pipeline, 5-First inlet pipeline, 6-First compressor inlet pipeline, 7-First induced draft fan, 8-Second induced draft fan, 9-Third induced draft fan, 10-Emission chimney, 11-First outlet valve, 12-First bypass pipeline valve, 13-Second outlet valve, 14-Second bypass pipeline valve, 15-Entry into main chimney valve, 16-Compressor inlet valve, 17-Compressor inlet check valve, 18-Second compressor inlet pipeline, 19-First absorption tower, 20-Second absorption tower, 21-Compressor, 22-Third absorption tower, 23-Second inlet pipeline. Detailed Implementation

[0013] The following will be combined with the appendix Figure 1 The technical solutions of this utility model are described in detail below, and the technical solutions in the examples of this utility model are clearly described. The described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0014] A method for processing NO in adipic acid tail gas x Qualified emission absorption devices, such as Figure 1As shown, the system includes a first absorption tower 19, a second absorption tower 20, a third absorption tower 22, a compressor 21, and an exhaust chimney 10. The exhaust chimney 10 is equipped with a first inlet pipeline 5 and a second inlet pipeline 23. The first absorption tower 19 and the second absorption tower 20 are connected in parallel to the first inlet pipeline 5 of the exhaust chimney 10 through the first absorption tower outlet pipeline 1 and the second absorption tower outlet pipeline 4, respectively. The compressor 21 is equipped with a first compressor inlet pipeline 6 and a second compressor inlet pipeline 18. The outlet of the compressor 21 is connected to the third absorption tower 22, and the outlet of the third absorption tower 22 is connected to the second inlet pipeline 23 of the exhaust chimney 10. The first absorption tower outlet pipeline 1 has a branch line 2, and the second absorption tower outlet pipeline 4 has a branch line 3. The first absorption tower outlet bypass pipeline 2 and the second absorption tower outlet bypass pipeline 3 are connected in parallel to the first compressor inlet pipeline 6.

[0015] The first absorption tower outlet pipeline 1 is equipped with a first induced draft fan 7 and a second induced draft fan 8 connected in parallel for backup, and the second absorption tower outlet pipeline 4 is equipped with a third induced draft fan 9.

[0016] The first compressor inlet pipeline 6 is equipped with a compressor inlet valve 16 and a compressor inlet check valve 17, and the second compressor inlet pipeline 18 is connected to the original adipic acid production exhaust gas device.

[0017] The first absorption tower outlet pipeline 1 is equipped with a first outlet valve 11, the first absorption tower outlet bypass pipeline 2 is equipped with a first bypass pipeline valve 12, the second absorption tower outlet pipeline 4 is equipped with a second outlet valve 13, and the second absorption tower outlet bypass pipeline 3 is equipped with a second bypass pipeline valve 14.

[0018] During use, the NO in the gas emitted after treatment by the first absorption tower 19 and the second absorption tower 20 is... x If the gas passes inspection, the first bypass line valve 12, the second bypass line valve 14, and the compressor inlet valve 16 are closed. The first outlet valve 11, the second outlet valve 13, and the inlet chimney valve 15 are opened. The gas flows through the first absorber outlet line 1 and the second absorber outlet line 4, converges at the first inlet line 5, and is discharged through the exhaust chimney 10. If the gas discharged from the first absorber 19 and the second absorber 20 contains NO... x If the gas fails to meet the emission standards, the first outlet valve 11, the second outlet valve 13, and the inlet chimney valve 15 are closed. The first bypass pipeline valve 12, the second bypass pipeline valve 14, and the compressor inlet valve 16 are opened. The gas passes through the first absorption tower outlet bypass pipeline 2 and the second absorption tower bypass pipeline 3 and is collected at the first compressor inlet pipeline 6. It is then discharged to the compressor 21 inlet and absorbed again by the third absorption tower 22. After meeting the environmental emission requirements, the gas enters the emission chimney 10 for discharge.

[0019] A compressor inlet backflow preventer valve 17 is added to the compressor 21 inlet to prevent high-concentration NOx gas from being discharged back from the original gas phase pipeline when the compressor 21 is shut down.

[0020] The diameters of the first absorption tower outlet pipeline 1, the first absorption tower bypass pipeline 2, the second absorption tower bypass pipeline 3, and the second absorption tower outlet pipeline 4 are DN200mm, and the diameters of the first inlet pipeline 5 and the first compressor inlet pipeline 6 are DN300mm, which can increase the flow of gas in the pipeline.

[0021] This utility model provides two technical implementation schemes for achieving qualified exhaust gas emissions. By adding some pipelines and valves to the original design and process, and through partial technical modifications, it meets environmental emission requirements and reduces exhaust gas emissions. The process is simple and convenient to operate, and each scheme ensures stable system operation, achieving both qualified exhaust gas emissions and normal, stable operation of the equipment.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A method for processing NO from adipic acid tail gas x The absorption device for qualified emissions is characterized in that, The system includes a first absorption tower, a second absorption tower, a third absorption tower, a compressor, and an exhaust chimney. The exhaust chimney has first and second inlet pipelines. The first and second absorption towers are connected in parallel to the first inlet pipeline of the exhaust chimney through their respective first and second absorption tower outlet pipelines. The compressor has first and second compressor inlet pipelines. The compressor outlet is connected to the third absorption tower. The outlet of the third absorption tower is connected to the second inlet pipeline of the exhaust chimney. The first and second absorption tower outlet bypass pipelines are branched off from the first and second absorption tower outlet pipelines. The first and second absorption tower outlet bypass pipelines are connected in parallel to the first compressor inlet pipeline.

2. The method for processing adipic acid tail gas NO according to claim 1 x The absorption device for qualified emissions is characterized in that, Two induced draft fans, one for standby and one for backup, are connected in parallel on the outlet pipeline of the first absorption tower, and an induced draft fan is installed on the outlet pipeline of the second absorption tower.

3. The method for processing adipic acid tail gas NO according to claim 1 x The absorption device for qualified emissions is characterized in that, The first compressor inlet pipeline is equipped with a compressor inlet valve and a compressor inlet check valve, and the second compressor inlet pipeline is connected to the existing adipic acid production exhaust gas device.

4. The method for processing adipic acid tail gas NO according to claim 1 x The absorption device for qualified emissions is characterized in that, Valves are installed on the outlet pipeline of the first absorption tower, the outlet pipeline of the second absorption tower, the outlet bypass pipeline of the first absorption tower, the outlet bypass pipeline of the second absorption tower, and the first inlet pipeline.

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