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A wet purification system suitable for coke oven gas

A technology for wet purification and coke oven gas, which is applied in the fields of combustible gas purification, combustible gas purification/transformation, and removal of gas pollutants. It can avoid secondary pollution, facilitate system maintenance, and achieve high desulfurization efficiency.

Inactive Publication Date: 2016-05-04
SICHUAN AVIATION TUBE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, coke oven gas has been widely used in fuel, chemical raw materials, etc. We know that unpurified coke oven gas contains a variety of gas components, especially tar, naphthalene, hydrogen cyanide, hydrogen sulfide and A variety of organic sulfur with complex structure, etc., when used as fuel, especially coke oven gas is often used for urban civilian use due to its high calorific value and low CO content. Coal gas is easy to produce sulfur dioxide in the combustion process, which not only pollutes the air, but is also highly toxic to the human body, and has a serious corrosive effect on gas pipelines, gas-related equipment and gas; when used as chemical raw materials, it can be used as steel Enterprises refine steel, but the content of hydrogen sulfide in coke oven gas will reduce the quality of steel. Therefore, coke oven gas must be desulfurized before use

Method used

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  • A wet purification system suitable for coke oven gas
  • A wet purification system suitable for coke oven gas
  • A wet purification system suitable for coke oven gas

Examples

Experimental program
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Effect test

Embodiment 1

[0026] figure 1 It is the process flow diagram of the wet purification system involved in this embodiment, as figure 1 As shown, the system is mainly composed of primary cooling tower, electric tar catcher, gas heat exchanger, benzene washing tower, ammonia remover and desulfurization tower which are connected with the coke oven gas pipe in sequence. The outlet is sent to the user, and the regeneration tower connected to the desulfurization tower is used to provide desulfurization liquid to the desulfurization tower to remove sulfide and cyanide in the gas.

[0027] In actual industrial production, the coke oven gas is first sent to the primary cooling tower through the coke oven gas pipe 1, then the electric tar catcher removes tar, the gas heat exchanger cools down to 60-80°C, the benzene washing tower removes naphthalene, and the ammonia remover After removing ammonia, the gas is sent to the lower section of the desulfurization tower from the gas inlet 4. Since the desulfu...

Embodiment 2

[0030] The difference between this embodiment and embodiment 1 is: as figure 2Shown, the ammonia remover that present embodiment relates to is to be provided with the spray type saturator of ammonium sulfate outlet 9, in actual industrial process, spray type saturator comes from the ammonium sulfate production section, and coal gas is sent into the ammonium sulfate workshop section Spray-type saturator, in the spray-type saturator, it is sprayed with the circulating mother liquor containing 3.5-45% free acid (sulfuric acid), and the circulating mother liquor absorbs the ammonia in the gas to form ammonium sulfate, and the ammonia is removed by the spray-type saturator The ammonia content in the final gas is generally less than 0.05g / m 3 .

[0031] Such as figure 2 As shown, the present embodiment also adds a Claus device on the basis of Embodiment 1, and the regeneration tower regenerates the washing liquid of the desulfurization tower, and the separated acid gas H 2 S, H...

Embodiment 3

[0033] The difference between this embodiment and embodiment 2 is: as figure 2 As shown, this embodiment adds a final cooling tower on the basis of Embodiment 2. The final cooling tower is arranged between the gas heat exchanger and the benzene washing tower, which can further reduce the temperature of the gas coming out of the gas heat exchanger and prevent high temperature When the coal gas passes through the benzene washing tower to remove naphthalene, it will cause blockage of the equipment, and the temperature of the gas after passing through the final cooler is usually controlled at 30-40°C.

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Abstract

A wet purification system suitable for coke oven gas is disclosed. The system comprises a primary cooling tower connected to a coke oven gas pipe, an electrical tar precipitator, a gas heat exchanger, a benzene washing tower, an ammonia remover and a desulfurizing tower which are connected in order. A purified-gas outlet is disposed in the desulfurizing tower. A regeneration tower for supplying a desulfurizing liquid is connected to the desulfurizing tower. The system is high in desulfurizing efficiency. Purified gas can be directly used for civilian uses, the metallurgical industry, and the like. After desulfurization and purification, the content of hydrogen sulfide can be lowered to 0.02 g / m3 and the content of hydrogen cyanide can be lowered to 0.1 g / m3.

Description

technical field [0001] The invention is a wet purification system suitable for coke oven gas, specifically relates to the purification treatment technology of harmful substances in coke oven gas, and belongs to the field of waste gas treatment. Background technique [0002] Coke oven gas is a by-product produced in the coking process. my country is a big country in coking, producing 320m3 per ton of dry coal 3 According to the calculation of coke oven gas, the annual emission of coke oven gas in the country can reach as much as 64 billion cubic meters. At present, coke oven gas has been widely used in fuel, chemical raw materials, etc. We know that unpurified coke oven gas contains a variety of gas components, especially tar, naphthalene, hydrogen cyanide, hydrogen sulfide and A variety of organic sulfur with complex structure, etc., when used as fuel, especially coke oven gas is often used for urban civilian use due to its high calorific value and low CO content. Coal gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/08C10K1/04C10K1/00C10K1/18C10K1/12C10K1/10
CPCC10K1/003C10K1/00C10K1/004C10K1/005C10K1/006C10K1/046C10K1/085C10K1/103C10K1/122C10K1/18
Inventor 蒲安斌
Owner SICHUAN AVIATION TUBE IND CO LTD
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