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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

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 existing coking plant boiler flue gas treatment process. It provides a low-temperature desulfurization and denitrification method for boiler flue gas. 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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  • Low-temperature desulfurization and denitrification method of boiler smoke

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Experimental program
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Effect test

Embodiment 1

[0048] 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 denitrification tower, and at 240°C, under the action of the ZSM-5 molecular sieve catalyst, the nitrogen oxides are reduced to nitrogen, and the flue gas after the reaction enters the waste heat boiler to generate steam, and the flue gas temperature drops to about 180°C; then the flue gas The gas enters the self-heat exchanger and exchanges heat with the cold flue gas entering the chimney, and the temperature drops to about 110°C; the flue gas at 110°C is cooled to 50°C by spraying, and the spray water is recycled, and part of the waste water is neutralized. Biochemical removal system; the cooled flue gas passes through the demisting equipment and enters the adsorption tower; three 200m 3 The adsorption tower, two open and one standby, each adsorption tower is filled with 120m 3 Microcrystalline material, total 360 m 3 M...

Embodiment 2

[0050] 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 content is 100 mg / m 3 , the flue gas enters the denitrification tower, at 240°C, under the action of ZSM-5 molecular sieve catalyst, nitrogen oxides are reduced to nitrogen, and the flue gas after the reaction enters the waste heat boiler to generate 150°C steam, and the flue gas temperature drops to about 140°C; Then the flue gas enters the spray and cools down to 40°C, the spray water is recycled, and part of the wastewater is neutralized before going to the biochemical system; the cooled flue gas passes through the demisting equipment and enters the adsorption tower; three 200m 3 The adsorption tower, two open and one standby, each adsorption tower is filled with 120m 3 Microcrystalline material, total 360 m 3 Microcrystalline material ZSM-5 molecular sieve; the specification of the adsorption t...

Embodiment 3

[0052] The specific implementation is as attached figure 1 The device process shown, 140,000 cubic meters of flue gas at 300°C, the nitrogen oxide content is 450mg / m 3 , the sulfide content is 200 mg / m 3 , the flue gas enters the denitrification tower, and at 300°C, under the action of the copper-loaded ZSM-5 molecular sieve catalyst, the nitrogen oxides are reduced to nitrogen, and the flue gas after the reaction enters the waste heat boiler to generate steam at 160°C, and the flue gas enters the self-exchange The heater exchanges heat with the cold flue gas entering the chimney, and the temperature drops to about 110°C; the temperature of the flue gas at 110°C is reduced to about 110°C through the flue gas; the temperature of the flue gas at 110°C is cooled to 50°C by spraying, and the spraying The water is recycled, part of the waste water is neutralized, and then goes to the biochemical system; the cooled flue gas passes through the demisting equipment and enters the adso...

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Abstract

The invention relates to a low-temperature 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 low-temperature desulfurization and denitrification method of the boiler smoke, the boiler smoke which is led out of a boilerflue and contains sulfide and nitric oxide enters a denitrification tower containing a denitrification catalyst, enters a heat exchanger after being subjected to catalytic reduction, enters adsorptiontowers which contain micro-crystal adsorption agents after exchanging heat with smoke which goes to a chimney to enable the sulfide and the nitric oxide to be adsorbed, and then enters the chimney for discharge; nitric oxide and sulfide in regenerated smoke are subjected to salt manufacturing treatment. According to the technical scheme, by adopting the low-temperature 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 low-temperature 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 a...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/78B01D49/00B01D53/56
CPCB01D53/8625B01D49/00B01D53/04B01D53/78B01D2257/302
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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