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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

Inactive Publication Date: 2019-03-15
铜陵泰富特种材料有限公司 +1
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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

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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 , the concentration of naphthalene 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 , into the waste heat boiler to generate steam, ...

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 , the concentration of naphthalene 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 device process shown, 150,000 cubic meters of flue gas at 260°C, the nitrogen oxide content is 400mg / m 3 , the sul...

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 / 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, 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. The invention mainly aims at solving the problems of high operating cost and secondary pollution of conventional desulfurization and denitrification of the coke oven flue gas. The desulfurization and denitrification method disclosed by the invention adopts the technical scheme that sulfide is removed before the coke oven gas or blast furnace gas enters a coke oven and then the coke oven gas is burnt; the method comprises the following steps: the coke oven gas containing the sulfide and nitrogen oxide,induced from the coke oven flue, is marked as a material flow A; the material flow A is subjected to waste heat utilization to produce steam, and the cooled flue gas forms a material flow B; the material flow B enters a heat exchanger, and is subjected to heat exchange with flue gas from a chimney to form a material flow C; the material flow C enters the cooling tower for cooling and dedusting toform a material flow D; the material flow D enters the adsorption tower containing a microcrystalline adsorbent for adsorbing the sulfide and the nitrogen oxide to form a material flow E; the material flow E is subjected to heat exchange with the material flow C, is heated up and then enters the chimney for emission, the problems are better solved; the method can be used in the industrial production of desulfurization and denitrification of the coking 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): B01D53/86B01D53/78B01D49/00B01D53/56
CPCB01D49/00B01D53/04B01D53/78B01D53/8625B01D2257/302
Inventor 孙广亿虞文胜袁本雄周稳华马广伟汪银叶青保李腾姣
Owner 铜陵泰富特种材料有限公司
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