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Method and device for removing hydrogen sulphide from mixture gas containing low-concentration hydrogen sulphide

A technology of mixed gas and hydrogen sulfide, applied in chemical instruments and methods, separation methods, and separation of dispersed particles, etc., can solve the problems of waste of absorption liquid, large floor space, and low removal rate of hydrogen sulfide

Active Publication Date: 2009-07-29
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Small gas treatment capacity and low hydrogen sulfide removal rate;
[0005] 2. It is difficult to regenerate the absorption liquid;
[0006] 3. Large area;
[0007] 4. Serious waste of absorption liquid;
[0008] 5. Higher cost

Method used

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  • Method and device for removing hydrogen sulphide from mixture gas containing low-concentration hydrogen sulphide

Examples

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Embodiment

[0049] In a 2.5 million tons / year delayed coking unit cold coke water closed circulation system, according to the method of the present invention, an absorption tower is set to absorb the hydrogen sulfide gas in the mixed gas discharged from the cold coke hot water tank, and then remove the mixed gas The stench in it, its specific operation process and effect are described as follows:

[0050] 1. The nature of the gas mixture

[0051] The exhaust volume of coking hot water tank V=600m 3 / h, the outlet pipe of the coking hot water tank is DN400mm; the mixed gas is composed of air, water vapor, and a small amount of hydrogen sulfide gas, of which the content of hydrogen sulfide is not more than 100ppm, and the temperature is 80-90°C.

[0052] 2. The nature of the absorption liquid

[0053] The absorption solution used is 30% N-methylethylene glycol amine solution (MDEA), and 10% triethanolamine (TEA) is added as an additive.

[0054] 3. Device (absorption tower)

[0055] The...

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PUM

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Abstract

A method for removing hydrogen sulfide from a mixed gas containing low-concentration hydrogen sulfide gas is provided, comprising: providing an absorbing liquid, the absorbing liquid being selected from N-methylglycolamine solution, monoethanolamine solution, diethanolamine Solution, and their mixture; under the absolute pressure of 0.05-0.30MPa, the absorption liquid at 18-42°C is contacted with the mixed gas containing low-concentration hydrogen sulfide gas at 20-52°C, and the mixed gas is sequentially counter-current Absorption and swirl absorption to reduce the concentration of hydrogen sulfide in the mixed gas to 10ppm or lower; and perform swirl gas-liquid separation on the mixed gas entraining the absorption liquid. Also provided is a device for removing hydrogen sulfide from a mixed gas containing low-concentration hydrogen sulfide gas.

Description

technical field [0001] The present invention relates to a method for absorbing low-concentration hydrogen sulfide gas, in particular to a method for removing hydrogen sulfide from a mixed gas containing low-concentration hydrogen sulfide gas. The present invention also relates to a device for removing hydrogen sulfide from a mixed gas containing low-concentration hydrogen sulfide gas. Background technique [0002] Hydrogen sulfide is a highly irritating gas with a strong smell of rotten eggs. It is very toxic to the human body, and it is flammable and explosive. It is easy to corrode metals, cause catalyst poisoning, and block pipelines. Even a small amount of hydrogen sulfide in factory exhaust and natural gas will cause great pollution to the environment. Coal chemical industry, rubber regeneration, sewage sludge, and municipal waste treatment and other industrial processes will produce a lot of low-concentration hydrogen sulfide odor gas, which not only seriously affects...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/52B01D53/78B01D53/18
Inventor 杨强汪华林周萍李权炳
Owner EAST CHINA UNIV OF SCI & TECH
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