CN-224207752-U - Nitric acid tail gas recovery device

Abstract

The utility model provides a nitric acid tail gas recovery device, and belongs to the technical field of chemical industry. The utility model provides a nitric acid tail gas recovery device which comprises a nitric acid tail gas exhaust pipeline, a gas-liquid separator and a low-pressure reaction water cooler, wherein nitric acid tail gas is introduced into the nitric acid tail gas exhaust pipeline, a liquid ring compressor is arranged on the nitric acid tail gas exhaust pipeline, the nitric acid tail gas exhaust pipeline is connected with the gas-liquid separator, the gas-liquid separator is used for gas-liquid separation, a gas exhaust pipeline, a liquid exhaust pipeline and a liquid exhaust pipeline are arranged on the gas-liquid separator, NO X gas obtained by separation of the gas-liquid separator is connected with the low-pressure reaction water cooler. According to the nitric acid tail gas recovery device provided by the utility model, nitric acid tail gas is collected and enters the gas-liquid separator through the liquid ring compressor, gas-liquid separation is carried out on NO X gas carrying liquid, NO X gas enters the low-pressure reaction water cooler for pressurization and cooling, and the obtained NO X gas is returned to the nitric acid device, so that the recovery and reutilization of NO X gas are realized.

Inventors

• LIU ZENG
• LI YONGKUO
• Ban Hongsheng
• DU XIAOLING
• MENG FANJING
• Yan Kuizhang
• LIU HAIBIN
• Sun Saihua
• LIU YINGBO

Assignees

• 沧州大化股份有限公司

Dates

Publication Date

20260508

Application Date

20250530

Claims (10)

1. 1. A nitric acid tail gas recovery device, comprising: The nitric acid tail gas exhaust pipeline is provided with a liquid ring compressor; The nitric acid tail gas exhausting pipeline is connected with the gas-liquid separator, the gas-liquid separator carries out gas-liquid separation on NO X gas which is carried with liquid and is discharged by the liquid ring compressor, the gas-liquid separator is provided with a gas discharging pipeline, a liquid discharging pipeline and a liquid discharging pipeline, the NO X gas which is separated by the gas-liquid separator is discharged by the gas discharging pipeline, and The low-pressure reaction water cooler is connected with the gas exhaust pipeline and is used for carrying out pressurized cooling recovery treatment on NO X gas.
2. 2. A nitric acid tail gas recovery device according to claim 1, wherein said liquid discharge pipe is connected to a tail water tank, and said liquid discharge pipe is provided with a tail water pump.
3. 3. The nitric acid tail gas recovery device according to claim 1, wherein the liquid discharge pipeline is connected with a tail water tank, and a liquid level control valve is arranged on the liquid discharge pipeline.
4. 4. The nitric acid tail gas recovery device according to claim 1, wherein the gas-liquid separator is further provided with a liquid supply pipeline, and the liquid supply pipeline is connected with a liquid inlet of the liquid ring compressor.
5. 5. A nitric acid tail gas recovery device according to claim 4, wherein a heat exchanger is arranged on the liquid supply pipeline.
6. 6. A nitric acid tail gas recovery device according to claim 1, wherein a gas return line is provided on said gas discharge line, a first end of said gas return line being provided on said nitric acid tail gas evacuation line, and a pressure control valve being provided on said gas return line.
7. 7. A nitric acid tail gas recovery device according to claim 6, wherein said liquid ring compressor is arranged between a first end of said gas return conduit and said gas-liquid separator.
8. 8. The nitric acid tail gas recovery device according to claim 1, wherein the low-pressure reaction water cooler is connected with a dilute nitric acid absorption tower of the nitric acid device through a pipeline.
9. 9. The nitric acid tail gas recovery device according to claim 8, wherein a dilute nitrate NO X separator, a NO X compressor, a tail gas preheater and a high pressure reaction water cooler are arranged between the low pressure reaction water cooler and the dilute nitrate absorption tower.
10. 10. The nitric acid tail gas recovery device according to claim 1, wherein the gas-liquid separator is further provided with an acid liquid supplementing pipeline.

Description

Nitric acid tail gas recovery device Technical Field The utility model belongs to the technical field of chemical industry, and particularly relates to a nitric acid tail gas recovery device. Background Nitric acid is a strong acid with strong oxidizing property and corrosiveness, and is an important chemical raw material. The nitric acid device can produce a large amount of nitric acid tail gas in the nitric acid production process, the nitric acid tail gas is common industrial waste gas, a large amount of NO X gas (generally, nitrogen oxides NO X mainly comprise NO, NO 2、N2O、N2O3、N2O4、N2O5 and the like) is contained in the nitric acid tail gas, a large amount of NO X gas is easy to overflow in a tower tail water tank and a nitric acid storage tank of the nitric acid device, the discharge of the nitric acid tail gas causes serious pollution to the environment, serious threat is brought to the field environment and personnel occupational health, and particularly, the overflow phenomenon is aggravated in low-pressure high-temperature seasons in summer. The method for purifying nitrogen oxides at home and abroad is various, the nitric acid tail gas can be treated by using a liquid absorption method, the liquid absorption method mainly adopts water or aqueous solution of acid and alkali salt as an absorbent to absorb nitrogen oxides in the waste gas, so that the waste gas can be purified, in the treatment process, the nitric acid tail gas can be discharged into a nitric acid sewage pool by using a jet pump, but the absorption effect is limited, the treated nitric acid tail gas still contains NO X gas, meanwhile, the nitrate in the nitric acid sewage pool is seriously exceeded, and the discharge of the treated nitric acid tail gas and sewage still causes certain pollution to the environment, and in addition, the resource waste is also caused. Disclosure of utility model The utility model aims to provide a nitric acid tail gas recovery device, and aims to solve the problem that the nitric acid tail gas is still polluted after being treated. In order to achieve the purpose, the utility model adopts the technical scheme that the nitric acid tail gas recovery device comprises: The nitric acid tail gas exhaust pipeline is provided with a liquid ring compressor; The nitric acid tail gas exhausting pipeline is connected with the gas-liquid separator, the gas-liquid separator carries out gas-liquid separation on NO X gas which is carried with liquid and is discharged by the liquid ring compressor, the gas-liquid separator is provided with a gas discharging pipeline, a liquid discharging pipeline and a liquid discharging pipeline, the NO X gas which is separated by the gas-liquid separator is discharged by the gas discharging pipeline, and The low-pressure reaction water cooler is connected with the gas exhaust pipeline and is used for carrying out pressurized cooling recovery treatment on NO X gas. In one possible implementation, the liquid discharge pipe is connected with a tower tail water tank, and a tower tail water pump is arranged on the liquid discharge pipe. In one possible implementation, the liquid discharge pipe is connected with a tower tail water tank, and a liquid level control valve is arranged on the liquid discharge pipe. In one possible implementation manner, the gas-liquid separator is further provided with a liquid supply pipeline, and the liquid supply pipeline is connected with a liquid inlet of the liquid ring compressor. In one possible implementation, a heat exchanger is provided on the liquid supply line. In one possible implementation, the gas exhaust pipe is provided with a gas return pipe, a first end of the gas return pipe is arranged on the nitric acid tail gas emptying pipe, and the gas return pipe is provided with a pressure control valve. In one possible implementation, the liquid ring compressor is disposed between the first end of the gas return conduit and the gas-liquid separator. In one possible implementation, the low pressure reaction water cooler is connected to a dilute nitric absorber column of a nitric acid plant by a conduit. In one possible implementation, a lean nitrate NO X separator, a NO X compressor, a tail gas preheater, and a high pressure reaction water cooler are disposed between the low pressure reaction water cooler and the lean nitrate absorption column. In one possible implementation manner, the gas-liquid separator is further provided with an acid liquor supplementing pipeline. The nitric acid tail gas recovery device provided by the utility model has the beneficial effects that: Compared with the prior art, the nitric acid tail gas recovery device is provided with the nitric acid tail gas exhaust pipeline, the gas-liquid separator and the low-pressure reaction water cooler, the nitric acid tail gas exhaust pipeline is used for carrying out the transportation of nitric acid tail gas, the nitric acid tail gas exhaust pipeline can be connected to all devices wh