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Desulfurization and denitrification method for coke oven flue gas

A technology of desulfurization and denitrification, coke oven gas, applied in the field of desulfurization and denitrification, can solve the problems of high operating cost, secondary pollution, etc., and achieve the effect of stable operation of the device and cost reduction

Pending Publication Date: 2019-05-28
湖北申昙环保新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is the technical problem of high operating cost and secondary pollution in the coke oven flue gas treatment process of the existing coking plant. A method for low-temperature desulfurization and denitrification of coke oven flue gas is provided. The treatment method has the following advantages: The advantages of short process, low equipment investment, simple regeneration, low energy consumption and no secondary pollution

Method used

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  • Desulfurization and denitrification method for coke oven flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The coke oven gas from the coke oven enters the crude debenzene unit, and the crude debenzene forms stream I, wherein the benzene concentration in stream I is 1000-4000 mg / m 3 Between, the concentration of naphthalene is 200~500mg / m 3 Between, the concentration of hydrogen sulfide is 100~500mg / m 3 Between; stream Ⅰ enters the comprehensive purification tower, the comprehensive purification tower contains ZSM molecular sieve adsorbent, removes aromatics and sulfides in the gas at the same time, and forms stream Ⅱ, the benzene concentration in stream Ⅱ is less than 1000mg / m 3 , naphthalene concentration is less than 4 mg / m 3 , the concentration of hydrogen sulfide is less than 4mg / m 3 ;Organic sulfur concentration is less than 4mg / m 3 ; Stream II enters the coke oven for combustion.

[0054] 160,000 cubic meters of flue gas at 240°C, with a nitrogen oxide content of 500mg / m 3 , the sulfide content is 200 mg / m 3 , the flue gas enters the self-heat exchanger and excha...

Embodiment 2

[0056] The coke oven gas from the coke oven enters the crude debenzene unit, and the crude debenzene forms stream I, wherein the benzene concentration in stream I is 1000-4000 mg / m 3 Between, the concentration of naphthalene is 200~500mg / m 3 Between, the concentration of hydrogen sulfide is 100~500mg / m 3 Between; stream Ⅰ enters the comprehensive purification tower, the comprehensive purification tower contains ZSM molecular sieve adsorbent, removes aromatics and sulfides in the gas at the same time, and forms stream Ⅱ, the benzene concentration in stream Ⅱ is less than 1000mg / m 3 , naphthalene concentration is less than 4 mg / m 3 , the concentration of hydrogen sulfide is less than 4mg / m 3 ;Organic sulfur concentration is less than 4mg / m 3 ; Stream II enters the coke oven for combustion.

[0057] The specific implementation is as attached figure 1 The shown device flow, 150,000 cubic meters of flue gas at 260°C, the nitrogen oxide content is 400mg / m 3 , the sulfide conte...

Embodiment 3

[0059] The coke oven gas from the coke oven enters the crude debenzene unit, and the crude debenzene forms stream I, wherein the benzene concentration in stream I is 1000-3500 mg / m3 Between, the concentration of naphthalene is 200~500mg / m 3 Between, the concentration of hydrogen sulfide is 100~500mg / m 3 Between; stream Ⅰ enters the comprehensive purification tower, which contains zinc-modified ZSM-5 molecular sieve adsorbent, and simultaneously removes aromatics and sulfides in the gas to form stream Ⅱ, in which benzene Concentration less than 60mg / m 3 , the concentration of naphthalene is less than 1 mg / m 3 , hydrogen sulfide concentration is less than 1mg / m 3 ; Concentration in toluene, xylene, ethylbenzene, trimethylbenzene, naphthalene, anthracene, and fennel is less than 1 mg / m 3 ;The concentration of sulfide is hydrogen sulfide, sulfur dioxide, mercaptan, thioether, thiophene, methyl mercaptan, methyl sulfide is less than 1 mg / m 3 , logistics II enters the coke oven ...

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Abstract

The invention relates to a desulfurization and denitrification method for coke oven flue gas, and aims to solve the problems of high running cost and generation of secondary pollution in an existing desulfurization and denitrification process of the coke oven flue gas. The method involved in the invention is characterized by comprising the following steps: removing sulfide from coke oven gas or blast furnace gas to be burned in a coke oven before the coke oven gas or blast furnace gas enters the coke oven, and then enabling the coke oven gas or blast furnace gas to burn; recording the coke oven flue gas containing the sulfide and nitrogen oxides educed from a coke oven flue channel as logistics A, wherein the temperature of the logistics A is 120-320 DEG C; enabling the logistics A to enter a heat exchanger and form a logistics B after flue gas heat exchange with a chimney, wherein the temperature of the logistics B is 100-180 DEG C; enabling the logistics B to enter a cooling tower and form a logistics C after spraying, cooling and dust removal, wherein the temperature of the logistics C is 30-100 DEG C; enabling the logistics C to enter an adsorption tower containing a microcrystalline adsorbent and form a logistics D after adsorption of the sulfide and the nitrogen oxides; and enabling the logistics D to enter the chimney so as to be discharged after heat exchange with the logistics A and warming. Therefore, the above technical problems are well solved. The method can be applied to the industrial production of desulfurization and denitrification of the coke oven flue gas.

Description

technical field [0001] The invention belongs to the technical field of desulfurization and denitrification, and in particular relates to a method for desulfurization and denitrification of coke oven flue gas. Background technique [0002] SO 2 and NO X Both are important air pollutants in my country. Excessive emissions will cause smog, acid rain and photochemical smog, which seriously endanger the ecological environment and human health. The combustion of fossil fuels is SO 2 and NO X main source of . Coal is the most important natural energy in my country. As the second largest coal-consuming field in China, coal coking is one of the main pollution sources in the field of industrial coal use, and coke oven flue gas is an important pollution source of the atmosphere. [0003] At present, wet desulfurization technology and semi-dry desulfurization technology represented by ammonia method, lime / limestone method, double alkali method and magnesium oxide method are widely ...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/60B01D53/72B01D47/06F23J15/06F23J15/02F23J15/04B01D53/04
CPCY02A50/20Y02E20/30
Inventor 马广伟宋晶孙广亿
Owner 湖北申昙环保新材料有限公司
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