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Boiler flue gas desulfurization and denitrification method

A technology for boiler flue gas, desulfurization and denitrification, applied in the field of desulfurization and denitrification, can solve the problems of secondary pollution and high operation cost, 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 existing coking plant boiler flue gas treatment process. A method for desulfurization and denitrification of boiler flue gas is provided. The processing method has a short process, The advantages of low equipment investment, simple regeneration, low energy consumption, and no secondary pollution

Method used

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  • Boiler flue gas desulfurization and denitrification method

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Experimental program
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Effect test

Embodiment 1

[0047] 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 ; Logistics II enters the boiler for combustion.

[0048] 160,000 cubic meters of boiler flue gas at 145°C, with a nitrogen oxide content of 500mg / m 3 , the sulfide content is 200 mg / m 3 , the flue gas enters the cooling tower and is c...

Embodiment 2

[0050] 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 ; Logistics II enters the boiler for combustion.

[0051] The specific implementation is as attached figure 1 The device process shown, 150,000 cubic meters of flue gas at 180°C, the nitrogen oxide content is 400mg / m 3 , the sulfide co...

Embodiment 3

[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 1000-3500 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 Between, 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 b...

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Abstract

The invention relates to a boiler flue gas desulfurization and denitrification method and mainly aims to solve the problems that conventional boiler flue gas desulfurization and denitrification operation cost is high and secondary pollution can be caused. By adopting the technical scheme that before a coke oven gas or a blast furnace gas is fed into a boiler, sulfide is firstly removed from the coke oven gas or the blast furnace gas which is combusted in the boiler, nitric oxides and sulfide in a boiler gas are removed by using an adsorption method after combustion, and the nitric oxides and the sulfide in a regenerated flue gas are subjected to salt production treatment, the problems are well solved, and the method can be applied to industrial production of boiler flue gas desulfurizationand denitrification.

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 boiler 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 boiler 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 used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/78B01D49/00B01D53/56
CPCB01D53/8625B01D49/00B01D53/04B01D53/78B01D2257/302
Inventor 周稳华马广伟江年
Owner 铜陵泰富特种材料有限公司
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