Inter-node external circulation low-pressure multi-stage absorption device and process for nitrogen oxide-containing waste gas

Abstract

The invention relates to an inter-node external circulation low-pressure multi-stage absorption device and process for nitrogen oxide-containing waste gas. The device comprises a nitrogen oxide-containing waste gas inlet pipe, a compressor, a liquid storage tank, a nitrogen oxide-containing waste gas absorption column assembly, an absorption liquid feeding pipe and a silencing tower, wherein the nitrogen oxide-containing waste gas inlet pipe is connected with the compressor, one end of the compressor is connected with the nitrogen oxide-containing waste gas absorption column assembly, the other end of the compressor is connected with the liquid storage tank, and the nitrogen oxide-containing waste gas absorption column assembly is connected with the liquid storage tank; the top end of thenitrogen oxide-containing waste gas absorption column assembly is connected with the silencing tower, and the nitrogen oxide-containing waste gas absorption column assembly is connected with the absorption liquid feeding pipe. Low-pressure internode external circulation multistage countercurrent absorption of the nitrogen oxide-containing waste gas is carried out under the conditions of low pressure and normal temperature and the pressure is far lower than high pressure adopted in traditional nitrogen oxide-containing waste gas absorption, energy consumption is reduced, and reliability of thedevice is improved.

Description

technical field

[0001] The invention relates to a low-pressure multi-stage gunpowder smoke absorbing device and process for internode external circulation, and belongs to the technical field of nitrogen oxide control. Background technique

[0002] Every year in my country, due to chemical processes such as nitrification reaction, nitric acid oxidation reaction, nitro compound decomposition, nitro compound synthesis, nitric acid production, and treatment of waste acid containing nitric acid, a large amount of waste gas containing high concentrations of nitrogen oxides, commonly known as gunpowder smoke, is usually used as NO X express. "High-concentration nitrogen oxides" refers to nitrogen-containing exhaust gas with a dark yellow color and a nitrogen oxide concentration hundreds to thousands of times higher than that of ordinary flue gas. Compared with ordinary flue gas containing a small amount of nitrogen oxides, this kind of gunpowder gas is more harmful. In addition to...

Examples

Embodiment 1

[0034] It can be seen from the accompanying drawings that a low-pressure multi-stage gunpowder smoke absorption device for internode external circulation includes a gunpowder smoke inlet pipe 1, a compressor 2, a liquid storage tank 3, a gunpowder smoke absorption tower assembly, an absorption liquid inlet pipe 4, and a silencer tower 5. The smoke intake pipe 1 is connected to the compressor 2, one end of the compressor 2 is connected to the smoke absorption tower assembly, the other end of the compressor 2 is connected to the liquid storage tank 3, and the smoke smoke absorption tower assembly is connected to the liquid storage tank 3; The top of the gunpowder smoke absorption tower assembly is connected to the silencer tower 5 , and the gunpowder smoke absorption tower assembly is connected to the absorption liquid inlet pipe 4 .

[0035] The gunpowder smoke absorption tower assembly includes at least two gunpowder smoke absorption towers 6, each gunpowder smoke absorption to...

Embodiment 2

[0043] Taking the waste acid concentration and nitrification tail gas absorption treatment device of a certain factory as an example, the composition of the gunpowder smoke at normal temperature and pressure is 10000-20000mg / m 3 (with NO 2 count).

[0044] Smoke absorption: Turn on the smoke compressor 2, and the pressurized smoke enters 1#, 2#, 3#, and 4# smoke absorption towers 6; #, 3#, 2#, 1# Gunpowder Smoke Absorption Tower 6, the gas-liquid two-phase is absorbed in countercurrent circulation in the absorption tower. Control the pressure of the gunpowder smoke absorption system to 0.15MPa; the liquid level of the 6 tanks of the gunpowder smoke absorption tower is 300-450mm; the circulating spray volume of each section of the absorption liquid is 8m 3 / h; 1# tower kettle, tower top temperature ≤ 30 ℃, other tower kettle, tower top temperature ≤ 15 ℃. The 1# smoke absorption tower cooler uses circulating water to remove the reaction heat in the smoke absorption process;...

Embodiment 3

[0049] Taking the waste acid concentration and nitrification tail gas absorption treatment device of a certain factory as an example, the composition of the gunpowder smoke at normal temperature and pressure is 10000-20000mg / m 3 (with NO 2 count).

[0050] Smoke absorption: Turn on the smoke compressor 2, and the pressurized smoke enters 1#, 2#, 3#, and 4# smoke absorption towers 6; #, 3#, 2#, 1# Gunpowder Smoke Absorption Tower 6, the gas-liquid two-phase is absorbed in countercurrent circulation in the absorption tower. Control the pressure of the gunpowder smoke absorption system to 0.2MPa; the liquid level of the 6 tanks of the gunpowder smoke absorption tower is 300-450mm; the circulating spray volume of the absorption liquid in each section is 6m 3 / h; 1# tower kettle, tower top temperature ≤ 30 ℃, other tower kettle, tower top temperature ≤ 20 ℃. The 1# smoke absorption tower cooler uses circulating water to remove the reaction heat in the smoke absorption process; ...

technical field

[0001] The invention relates to a low-pressure multi-stage gunpowder smoke absorbing device and process for internode external circulation, and belongs to the technical field of nitrogen oxide control. Background technique

[0002] Every year in my country, due to chemical processes such as nitrification reaction, nitric acid oxidation reaction, nitro compound decomposition, nitro compound synthesis, nitric acid production, and treatment of waste acid containing nitric acid, a large amount of waste gas containing high concentrations of nitrogen oxides, commonly known as gunpowder smoke, is usually used as NO X express. "High-concentration nitrogen oxides" refers to nitrogen-containing exhaust gas with a dark yellow color and a nitrogen oxide concentration hundreds to thousands of times higher than that of ordinary flue gas. Compared with ordinary flue gas containing a small amount of nitrogen oxides, this kind of gunpowder gas is more harmful. In addition to...

Examples

Embodiment 1

[0034] It can be seen from the accompanying drawings that a low-pressure multi-stage gunpowder smoke absorption device for internode external circulation includes a gunpowder smoke inlet pipe 1, a compressor 2, a liquid storage tank 3, a gunpowder smoke absorption tower assembly, an absorption liquid inlet pipe 4, and a silencer tower 5. The smoke intake pipe 1 is connected to the compressor 2, one end of the compressor 2 is connected to the smoke absorption tower assembly, the other end of the compressor 2 is connected to the liquid storage tank 3, and the smoke smoke absorption tower assembly is connected to the liquid storage tank 3; The top of the gunpowder smoke absorption tower assembly is connected to the silencer tower 5 , and the gunpowder smoke absorption tower assembly is connected to the absorption liquid inlet pipe 4 .

[0035] The gunpowder smoke absorption tower assembly includes at least two gunpowder smoke absorption towers 6, each gunpowder smoke absorption to...

Embodiment 2

[0043] Taking the waste acid concentration and nitrification tail gas absorption treatment device of a certain factory as an example, the composition of the gunpowder smoke at normal temperature and pressure is 10000-20000mg / m 3 (with NO 2 count).

[0044] Smoke absorption: Turn on the smoke compressor 2, and the pressurized smoke enters 1#, 2#, 3#, and 4# smoke absorption towers 6; #, 3#, 2#, 1# Gunpowder Smoke Absorption Tower 6, the gas-liquid two-phase is absorbed in countercurrent circulation in the absorption tower. Control the pressure of the gunpowder smoke absorption system to 0.15MPa; the liquid level of the 6 tanks of the gunpowder smoke absorption tower is 300-450mm; the circulating spray volume of each section of the absorption liquid is 8m 3 / h; 1# tower kettle, tower top temperature ≤ 30 ℃, other tower kettle, tower top temperature ≤ 15 ℃. The 1# smoke absorption tower cooler uses circulating water to remove the reaction heat in the smoke absorption process;...

Embodiment 3

[0049] Taking the waste acid concentration and nitrification tail gas absorption treatment device of a certain factory as an example, the composition of the gunpowder smoke at normal temperature and pressure is 10000-20000mg / m 3 (with NO 2 count).

[0050] Smoke absorption: Turn on the smoke compressor 2, and the pressurized smoke enters 1#, 2#, 3#, and 4# smoke absorption towers 6; #, 3#, 2#, 1# Gunpowder Smoke Absorption Tower 6, the gas-liquid two-phase is absorbed in countercurrent circulation in the absorption tower. Control the pressure of the gunpowder smoke absorption system to 0.2MPa; the liquid level of the 6 tanks of the gunpowder smoke absorption tower is 300-450mm; the circulating spray volume of the absorption liquid in each section is 6m 3 / h; 1# tower kettle, tower top temperature ≤ 30 ℃, other tower kettle, tower top temperature ≤ 20 ℃. The 1# smoke absorption tower cooler uses circulating water to remove the reaction heat in the smoke absorption process; ...

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