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Comprehensive desulfurization and denitration method for boiler flue gas

A technology for boiler flue gas, desulfurization and denitrification, applied in the field of desulfurization and denitrification, can solve the problems of high operating cost and secondary pollution.

Pending Publication Date: 2019-03-22
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 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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  • Comprehensive desulfurization and denitration method for boiler flue gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 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

[0051] 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

[0053] 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 desulfurization and denitration method for boiler flue gas. The method is mainly used for solving the problem that the existing boiler flue gas desulfurization and denitration are high in operating cost and secondary pollution is caused. According to the method, through adopting the technical scheme that nitrogen oxides and sulfides are removed from the boiler flue gas by an adsorption method, and the nitrogen oxides and the sulfides in the regenerated flue gas are subjected to salt making treatment, the above problem is better solved; the method can be applied to industrial production of desulfurization and denitration of the boiler 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 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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IPC IPC(8): B01D53/75B01D53/60B01D53/72B01D47/06B01D53/04
CPCB01D47/06B01D53/04B01D53/60B01D53/72B01D53/75B01D2253/106B01D2258/0283B01D2259/4009Y02A50/20
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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