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Low-temperature desulfurization and denitrification method of boiler smoke

A boiler flue gas, desulfurization and denitrification technology, applied in the field of desulfurization and denitrification, can solve the problems of secondary pollution and high operating costs, and achieve the effect of stable operation of the device and cost reduction

Inactive Publication Date: 2019-03-12
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 boiler flue gas treatment process of existing power plants, steel mills, and coking plants. A method for low-temperature desulfurization and denitrification of boiler flue gas is provided. The treatment method has the advantages of short process, low equipment investment, simple regeneration, low energy consumption, and no secondary pollution

Method used

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  • Low-temperature desulfurization and denitrification method of boiler smoke

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 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.

[0056] 160,000 cubic meters of boiler 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 denitrification tower,...

Embodiment 2

[0058] 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.

[0059] 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

[0061] 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 boiler f...

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Abstract

The invention relates to a desulfurization and denitrification method of boiler smoke. The problems that existing boiler smoke desulfurization and denitrification are high in running cost, and generate secondary pollution are mainly solved. According to the desulfurization and denitrification method of the boiler smoke, for coke oven gas or blast furnace gas which enters a boiler for burning, before the coke oven gas or the blast furnace gas enters the boiler, sulfide is removed at first, then burning is conducted, nitric oxide and the sulfide in the boiler smoke are removed through an adsorption method, and nitric oxide and sulfide in regenerated smoke are subjected to salt manufacturing treatment. According to the technical scheme, by adopting the desulfurization and denitrification method of the boiler smoke, the problems are well solved, and the method can be used for industrial production of desulfurization and denitrification of the boiler smoke.

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
CPCB01D49/00B01D53/04B01D53/78B01D53/8625B01D2257/302
Inventor 虞文胜周稳华马广伟
Owner 铜陵泰富特种材料有限公司
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