Chemical tail gas safety treatment device

Abstract

The utility model belongs to the technical field of tail gas treatment devices, and specifically relates to a chemical tail gas safety treatment device. The chemical tail gas safety treatment device described in the utility model includes an acrylic acid waste gas buffer tank, a waste gas circulation cooler, and a waste gas washing tower. The waste gas washing tower is provided with a tank area tail gas collection pipe, the waste gas washing tower is connected to the acrylic acid waste gas buffer tank, the acrylic acid waste gas buffer tank is connected to the waste gas circulation cooler, the bottom waste gas outlet of the acrylic acid waste gas buffer tank is provided with a flame arrester a and a waste gas fan, one way of the waste gas fan is connected to the waste gas circulation cooler through the waste gas circulation pipe, and the other way is connected to the incinerator, and a circulation pipeline regulating valve is provided on the waste gas circulation pipe, the fan inlet pipeline is interlocked with the circulation pipeline regulating valve, and the fan outlet pipeline is interlocked with the vent valve. The chemical tail gas safety treatment device provided by the utility model realizes economic, environmentally friendly, safe and efficient treatment of chemical tail gas.

Description

Technical Field

[0001] The utility model belongs to the technical field of tail gas treatment devices, and in particular relates to a chemical tail gas safety treatment device. Background Art

[0002] With the rapid development of the chemical industry, the problem of tail gas treatment generated in the chemical production process has become increasingly prominent. Harmful substances contained in chemical tail gas, such as organic matter, acidic gases, heavy metals, etc., cause serious harm to the environment and human health. Therefore, it is of great significance to safely treat chemical tail gas.

[0003] Acrylonitrile is an important chemical raw material, widely used in the manufacture of nitrile rubber, acrylic fiber, ABS industrial plastics and synthetic resins, and can also be used as a reaction medium. Acrylonitrile exists in the air in the form of vapor. Acrylonitrile is highly toxic and can cause poisoning if inhaled or contacted. People are relatively sensitive to acrylonitrile. At 1g / m 3 The concentration range of 35 to 220 mg / m 3 , which can cause loss of sense of smell, headaches, chest pains, and fear.

[0004] At present, the tail gas in the tank area of ​​the chemical industry contains toxic, harmful, flammable and explosive components, which are widely present in the petrochemical industry. The presence of VOCs in the tank area has an important impact on the health of workers, plant safety, urban air pollution and the quality of stored liquids. For the treatment of VOCs in the tank area, nitrogen sealing of the storage tank and recovery of the tail gas in the tank area are often used to reduce the emission of VOCs in the tank area, greatly reducing the risk of poisoning and explosion. However, the method of absorbing tail gas in the tank area often has safety hazards and incomplete treatment. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the above-mentioned defects in the prior art and provide a chemical tail gas safety treatment device to achieve economical, environmentally friendly, safe and efficient treatment of chemical tail gas.

[0006] The chemical tail gas safety treatment device described in the utility model comprises an acrylic acid waste gas buffer tank, a waste gas circulation cooler, and a waste gas washing tower. The middle and lower part of the waste gas washing tower is provided with a tank area tail gas collection pipe. The gas phase outlet of the waste gas washing tower is connected to the acrylic acid waste gas buffer tank. The acrylic acid waste gas buffer tank is connected with a waste gas circulation cooler. The bottom waste gas outlet of the acrylic acid waste gas buffer tank is provided with a flame arrester a and a waste gas fan. The outlet of the waste gas fan is divided into two routes, one route is connected to the waste gas circulation cooler through the waste gas circulation pipe, and the other route is connected to the incinerator. The waste gas circulation pipe is provided with a circulation pipeline regulating valve. The waste gas fan is connected with a fan inlet pipeline and a fan outlet pipeline. The fan inlet pipeline is interlocked with the circulation pipeline regulating valve for control, and the fan outlet pipeline is interlocked with the vent valve for control. The waste gas fans can be provided in parallel with multiple units.

[0007] Preferably, a lean water pipeline is provided at the top of the waste gas washing tower, and the lean water pipeline is used as washing liquid.

[0008] Preferably, the bottom of the waste gas washing tower is connected to a pit tank, and the pit tank is recovered and used as the absorption liquid of the quenching tower.

[0009] Preferably, a close-packing valve is provided at the bottom of the acrylic acid waste gas buffer tank, and is connected to the close-packing tank via the close-packing valve.

[0010] Preferably, a cooling water supply pipe and a cooling water return pipe are provided on the exhaust gas circulation cooler.

[0011] Preferably, an oxygen content detection meter is provided on the blower outlet pipeline.

[0012] Preferably, a vent pipe is provided at the inlet of the incinerator, and a vent valve and a flame arrester b are provided on the vent pipe.

[0013] Preferably, a flame arrester a is provided on the fan inlet pipeline.

[0014] Preferably, a liquid level meter is provided on the exhaust gas washing tower.

[0015] The chemical tail gas safety treatment device described in the utility model, when working:

[0016] (1) This tank area contains 8 storage tanks. The tank pressure is set with a self-supporting regulating valve. When the pressure inside the tank exceeds 5KPa, the self-supporting regulating valve opens and the gas is collected to the tank area exhaust collection pipe through the discharge pipe.

[0017] (2) The tail gas from the tank area enters the middle part of the exhaust gas washing tower in reverse flow, and contacts the lean water entering from the top lean water pipeline in reverse flow in the packing layer to wash and absorb the tail gas. The absorbed condensate is discharged from the bottom of the washing tower to the pit tank for recycling.

[0018] (3) After washing and absorption, the unabsorbed tail gas is discharged from the top of the waste gas washing tower and enters the acrylic acid waste gas buffer tank. The gas phase droplets accumulate at the bottom of the tank and are discharged into the close-packed tank. The remaining tail gas passes through the middle of the acrylic acid waste gas buffer tank through the flame arrester a and enters the inlet of the waste gas fan, and then goes to the incinerator for incineration through the waste gas fan.

[0019] (4) An exhaust gas circulation pipe is provided at the outlet of the exhaust gas fan. When the inlet pressure of the exhaust gas fan is low, the regulating valve of the circulation pipeline automatically opens to increase the amount of exhaust gas returned to the acrylic acid waste gas buffer tank to maintain the inlet pressure of the exhaust gas fan and ensure the stable operation of the exhaust gas fan.

[0020] (5) An oxygen content detection meter is installed at the exhaust fan outlet. When the oxygen content exceeds the interlock value, the interlock opens the vent valve and vents the air through the flame arrester B to ensure safe operation and prevent explosion accidents due to high oxygen content.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The utility model provides a safe treatment device for chemical tail gas, realizes the centralized recovery of tail gas in the tank area, realizes the effective absorption of tail gas in the tank area, realizes the safe transportation of tail gas in the tank area, realizes the incineration and reuse of tail gas, and is environmentally friendly and energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of a chemical tail gas safety treatment device of the present utility model.

[0024] In the figure: 1. Acrylic acid waste gas buffer tank; 2. Waste gas washing tower; 3. Tank area tail gas collection pipe; 4. Lean water pipeline; 5. Pit tank; 6. Flame arrester a; 7. Closely packed tank; 8. Closely packed valve; 9. Waste gas fan; 10. Fan inlet pipeline; 11. Incinerator; 12. Vent pipe; 13. Vent valve; 14. Flame arrester b; 15. Waste gas circulation pipe; 16. Oxygen content detection meter; 17. Fan outlet pipeline; 18. Circulation pipeline regulating valve; 19. Waste gas circulation cooler; 20. Cooling water supply pipe; 21. Cooling water return pipe; 22. Liquid level meter. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with specific embodiments.

[0026] like Figure 1As shown, the chemical tail gas safety treatment device comprises an acrylic acid waste gas buffer tank 1, a waste gas circulation cooler 19, and a waste gas washing tower 2. A tank area tail gas collecting pipe 3 is arranged at the middle and lower part of the waste gas washing tower 2. The gas phase outlet of the waste gas washing tower 2 is connected to the acrylic acid waste gas buffer tank 1. The acrylic acid waste gas buffer tank 1 is connected to the waste gas circulation cooler 19. The bottom waste gas outlet of the acrylic acid waste gas buffer tank 1 is provided with a flame arrester a and a waste gas fan 9. The outlet of the waste gas fan 9 is divided into two routes, one of which is connected to the waste gas circulation cooler 19 through the waste gas circulation pipe 15, and the other is connected to the incinerator 11. The waste gas circulation pipe 15 is provided with a circulation pipeline regulating valve 18. The waste gas fan 9 is connected to a fan inlet pipeline 10 and a fan outlet pipeline 17. The fan inlet pipeline 10 is interlocked with the circulation pipeline regulating valve 18, and the fan outlet pipeline 17 is interlocked with the vent valve 13. Two waste gas fans can be arranged in parallel.

[0027] A lean water pipeline 4 is provided at the top of the exhaust gas washing tower 2 .

[0028] The bottom of the exhaust gas washing tower 2 is connected to a pit tank 5 .

[0029] A close-packing valve 8 is provided at the bottom of the acrylic acid waste gas buffer tank 1 , and is connected to the close-packing tank 7 via the close-packing valve 8 .

[0030] The exhaust gas circulation cooler 19 is provided with a cooling water supply pipe 20 and a cooling water return pipe 21 .

[0031] An oxygen content detection meter 16 is provided on the fan outlet pipeline 17 .

[0032] A vent pipe 12 is provided at the inlet of the incinerator 11, and a vent valve 13 and a flame arrester b14 are provided on the vent pipe 12.

[0033] A flame arrester a6 is provided on the fan inlet pipeline 10.

[0034] A liquid level meter 22 is provided on the exhaust gas washing tower 2 .

[0035] The chemical tail gas safety treatment device, when working:

[0036] (1) This tank area contains 8 storage tanks. The tank pressure is set with a self-supporting regulating valve. When the pressure inside the tank exceeds 5KPa, the self-supporting regulating valve opens and collects the exhaust gas to the tank area exhaust collection pipe 3 through the discharge pipe.

[0037] (2) The tail gas from the tank area enters the middle part of the exhaust gas washing tower 2 in reverse flow, and contacts the lean water entering from the top lean water pipeline 4 in reverse flow in the packing layer, washing and absorbing the tail gas. The absorbed condensate is discharged from the bottom of the washing tower to the pit tank 5 for recycling.

[0038] (3) After washing and absorption, the unabsorbed exhaust gas is discharged from the top of the exhaust gas washing tower 2 and enters the acrylic acid exhaust gas buffer tank 1. The gas phase droplets accumulate at the bottom of the tank and are discharged to the close-packed tank 7. The remaining exhaust gas passes through the middle of the acrylic acid exhaust gas buffer tank 1 through the flame arrester a6 and enters the inlet of the exhaust gas fan 9, and then goes to the incinerator 11 through the exhaust gas fan 9 for incineration treatment.

[0039] (4) An exhaust gas circulation pipe 15 is provided at the outlet of the exhaust gas fan 9. When the inlet pressure of the exhaust gas fan 9 is low, the circulation pipeline regulating valve 18 automatically opens to increase the amount of exhaust gas returned to the acrylic acid exhaust gas buffer tank 1 to maintain the inlet pressure of the exhaust gas fan 9 and ensure the stable operation of the exhaust gas fan 9.

[0040] (5) An oxygen content detection meter 16 is provided at the outlet of the exhaust fan 9. When the oxygen content exceeds the interlock value, the interlock opens the vent valve 13 and vents the air through the flame arrester b14 to ensure safe operation and prevent explosion accidents due to high oxygen content.

[0041] The utility model can improve the safety of tail gas treatment, reduce the occurrence of safety accidents and avoid pollution to the environment through the reasonable design and operation of the tail gas system in the tank area.

[0042] Of course, the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and any equivalent changes and improvements made by ordinary technicians in the technical field within the essential scope of the present invention shall fall within the scope of the patent coverage of the present invention.

Claims

1. A chemical tail gas safety treatment device, characterized in that: The invention comprises an acrylic acid waste gas buffer tank (1), a waste gas circulation cooler (19), and a waste gas washing tower (2). A tank area tail gas collecting pipe (3) is arranged at the middle and lower part of the waste gas washing tower (2). The gas phase outlet of the waste gas washing tower (2) is connected to the acrylic acid waste gas buffer tank (1). The acrylic acid waste gas buffer tank (1) is connected to the waste gas circulation cooler (19). A flame arrester A and a waste gas fan (9) are arranged at the waste gas outlet at the bottom of the acrylic acid waste gas buffer tank (1). The waste gas fan (9) The outlet is divided into two routes, one route is connected to the waste gas circulation cooler (19) through the waste gas circulation pipe (15), and the other route is connected to the incinerator (11). The waste gas circulation pipe (15) is provided with a circulation pipeline regulating valve (18). The waste gas fan (9) is connected to a fan inlet pipeline (10) and a fan outlet pipeline (17). The fan inlet pipeline (10) is interlocked with the circulation pipeline regulating valve (18) and the fan outlet pipeline (17) is interlocked with the vent valve (13).

2. The chemical tail gas safety treatment device according to claim 1 is characterized in that: A lean water pipeline (4) is arranged at the top of the exhaust gas washing tower (2).

3. The chemical tail gas safety treatment device according to claim 1 is characterized in that: The bottom of the waste gas washing tower (2) is connected to a pit tank (5).

4. The chemical tail gas safety treatment device according to claim 1 is characterized in that: A close-packing valve (8) is provided at the bottom of the acrylic acid waste gas buffer tank (1), and is connected to the close-packing tank (7) via the close-packing valve (8).

5. The chemical tail gas safety treatment device according to claim 1 is characterized in that: The exhaust gas circulation cooler (19) is provided with a cooling water supply pipe (20) and a cooling water return pipe (21).

6. The chemical tail gas safety treatment device according to claim 1 is characterized in that: An oxygen content detection meter (16) is provided on the fan outlet pipeline (17).

7. The chemical tail gas safety treatment device according to claim 1 is characterized in that: A vent pipe (12) is provided at the inlet of the incinerator (11), and a vent valve (13) and a flame arrester b (14) are provided on the vent pipe (12).

8. The chemical tail gas safety treatment device according to claim 1 is characterized in that: A flame arrester a (6) is provided on the fan inlet pipeline (10).

9. The chemical tail gas safety treatment device according to claim 1, characterized in that: The waste gas washing tower (2) is provided with a liquid level meter (22).

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