A tail gas absorption device in a chemical reaction process

Abstract

The utility model discloses a tail gas absorption device in a chemical reaction process, which is an absorption unit composed of an absorber, an absorption liquid tank and a centrifugal pump. In the absorption unit, a tail gas inlet, a tail gas outlet, an absorption liquid inlet and an absorption liquid outlet are arranged on the absorber. Replaceable fillers are installed in the absorber. The outlet of the absorption liquid tank is connected to the absorption liquid inlet on the upper part of the absorber through a pipeline with a centrifugal pump. The absorption liquid inlet is connected to a spray head on the upper part of the absorber. The absorption liquid outlet at the bottom of the absorber is connected to the inlet of the absorption liquid tank through a pipeline. The tail gas inlet of the absorber is used to receive the tail gas, and the tail gas outlet is connected to an induced draft fan. The utility model has the characteristics of low negative pressure requirement, greater safety and higher absorption efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of tail gas treatment equipment for fine chemical production, and in particular relates to a tail gas absorption device in a chemical reaction process. Background Art

[0002] In the chemical production process, many reactions will generate a large amount of by-product gas or waste gas. These gases are usually acidic, alkaline or toxic and harmful and cannot be discharged directly, otherwise it will cause serious pollution to the environment. The commonly used absorption method in production is to add water or other absorption liquid to the absorber, connect them in series, and then pump the gas into the buffer tank under vacuum negative pressure conditions to absorb it through water or other absorption liquid. After reaching a certain concentration, it is discharged for unified treatment, and the residual gas is absorbed into the induced draft system and treated by environmental protection facilities such as spray towers to meet the standards before being discharged into the atmosphere. The disadvantages of this absorption method are: 1. Low gas absorption efficiency. 2. High requirements for negative pressure. 3. Once there is a problem with the negative pressure system or a power outage during the absorption process, the water or other absorption liquid in the absorber is easily sucked back into the reactor, thereby affecting the reaction effect and even causing danger. Utility Model Content

[0003] The utility model aims to improve the deficiencies of the prior art and provide a tail gas absorption device in a chemical reaction process which has low negative pressure requirements, is safer and has higher absorption efficiency.

[0004] The purpose of the utility model is achieved in this way. A tail gas absorption device in a chemical reaction process includes an absorber, which is characterized in that the absorber, an absorption liquid tank and a centrifugal pump form an absorption unit, the absorber in the absorption unit is provided with a tail gas inlet, a tail gas outlet, an absorption liquid inlet and an absorption liquid outlet, a replaceable filler is installed in the absorber, the outlet of the absorption liquid tank is connected to the absorption liquid inlet on the upper part of the absorber through a pipeline with a centrifugal pump, the absorption liquid inlet is connected to the spray head on the upper part of the absorber, the absorption liquid outlet at the bottom of the absorber is connected to the inlet of the absorption liquid tank through a pipeline, the tail gas inlet of the absorber is used to receive the tail gas, and the tail gas outlet is connected to the induced draft fan.

[0005] In order to further achieve the purpose of the utility model, the absorption unit can be used in series in two or more, the exhaust gas inlet of the first-stage absorber is connected to the external exhaust gas, the exhaust gas outlet is connected to the exhaust gas inlet of the next-stage absorber, and the exhaust gas outlet of the last stage is connected to the induced draft fan.

[0006] Compared with the prior art, this utility model patent has the following significant features and positive effects:

[0007] 1. The negative pressure formed by the induced draft fan during the absorption process is small, and there will be no back suction phenomenon, which prevents the absorption liquid from being sucked back into the reactor, thereby affecting the reaction effect or even causing danger.

[0008] 2. Due to the setting of the absorber, the tail gas generated by the reaction has a high absorption efficiency, and the absorption efficiency is increased from the original 60% to 90%.

[0009] 3. The negative pressure requirement is not high. The power of the induced draft fan can be adjusted according to the amount of exhaust gas generated by the reaction to ensure that all the exhaust gas generated by the reaction can be absorbed.

[0010] 4. Fillers are added into the absorber according to the properties of the gas generated by the reaction to disperse the gas and increase the absorption contact area.

[0011] 5. Use a shower-head-like spray head to spray the absorption liquid, which expands the spraying area and has a good absorption effect.

[0012] 6. Multiple absorption units can be connected in series as needed to ensure the tail gas absorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 The utility model is a structural schematic diagram of a sprinkler head.

[0015] Figure 3 The utility model is a schematic diagram of the structure of the spray surface of the spray head.

[0016] In the figure: 1. induced draft fan, 2. absorption liquid tank, 3. absorber, 4. centrifugal pump, 5. spray head, 6. packing, 7. exhaust gas inlet, 8. exhaust gas outlet, 9. absorption liquid inlet, 10. absorption liquid outlet. DETAILED DESCRIPTION

[0017] A tail gas absorption improvement device in a chemical reaction process, referring to Figure 1 , an absorber 3, an absorption liquid tank 2 and a centrifugal pump 4 are connected to form an absorption unit, in which the absorber 2 is provided with a tail gas inlet 7, a tail gas outlet 8, an absorption liquid inlet 9 and an absorption liquid outlet 10, a replaceable filler 6 is installed in the absorber 3, the outlet of the absorption liquid tank 2 is connected to the absorption liquid inlet 9 at the upper part of the absorber 3 through a pipeline with a centrifugal pump 4, the absorption liquid inlet 9 is connected to the spray head 5 at the upper part of the absorber 3, and the absorption liquid outlet 10 at the bottom of the absorber 3 is connected to the inlet of the absorption liquid tank 2 through a pipeline, the tail gas inlet 7 of the absorber 3 is used to receive unpurified tail gas, and the tail gas outlet 8 is used to connect to the induced draft fan 1. In order to ensure the purification effect, the absorption unit is used in series with more than two, the tail gas inlet 7 of the first-stage absorber 3 is connected to the external tail gas, the tail gas outlet 8 is connected to the tail gas inlet 7 of the next-stage absorber 3, and the tail gas outlet 8 of the last stage is connected to the induced draft fan 1, and the spray head 5 is in the shape of a shower head, refer to Figure 2 , Figure 3 .

[0018] When using, refer to Figure 1 In the figure, the solid line with arrows is the exhaust gas flow line, and the dotted line with arrows is the absorption liquid flow line. The exhaust gas generated by chemical production enters the absorber 3 through the exhaust gas pipeline through the slight negative pressure generated by the induced draft fan 1, and the absorption liquid is pumped into the absorber 3 through the absorption liquid pipeline by the centrifugal pump 4 to spray and absorb the exhaust gas. According to the properties of the reaction generated gas, suitable fillers 6 are added to the absorber 3 to disperse the gas and increase the absorption contact area. At the same time, a multi-stage series connection of absorption units is adopted to ensure the exhaust gas absorption effect.

Claims

1. A tail gas absorption device in a chemical reaction process, comprising an absorber, characterized in that The absorber, the absorption liquid tank and the centrifugal pump constitute an absorption unit. The absorber in the absorption unit is provided with a tail gas inlet, a tail gas outlet, an absorption liquid inlet and an absorption liquid outlet. Replaceable fillers are installed in the absorber. The outlet of the absorption liquid tank is connected to the absorption liquid inlet on the upper part of the absorber through a pipeline with a centrifugal pump. The absorption liquid inlet is connected to the spray head on the upper part of the absorber. The absorption liquid outlet at the bottom of the absorber is connected to the inlet of the absorption liquid tank through a pipeline. The tail gas inlet of the absorber is used to receive the tail gas, and the tail gas outlet is connected to the induced draft fan.

2. The tail gas absorption device in a chemical reaction process according to claim 1, characterized in that The absorption units are used in series with two or more, the tail gas inlet of the first-stage absorber is connected to the external tail gas, the tail gas outlet is connected to the tail gas inlet of the next-stage absorber, and the tail gas outlet of the last stage is connected to the induced draft fan.

3. The tail gas absorption device in a chemical reaction process according to claim 1, characterized in that The spray head is in the shape of a shower head.

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