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Desulfurization and denitrification method for pelletizing flue gas

A technology of desulfurization, denitrification and pelletizing, applied in the field of desulfurization and denitrification, can solve the problems of secondary pollution and high operating costs

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 process of pelletizing sintering flue gas treatment in existing iron and steel plants. A method for low-temperature desulfurization and denitrification of pelletizing sintering flue gas is provided. The 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1.06 million cubic meters of flue gas at 140°C, with a nitrogen oxide content of 500mg / m 3 , the sulfide content is 2000 mg / m 3 , the flue gas enters the spray tower, sprays and cools down to 50°C, and enters the adsorption tower; six 200m 3 The adsorption tower, 5 openings and 1 standby, each adsorption tower is filled with 150m 3 Microcrystalline materials, a total of 900m 3 The microcrystalline material is mordenite; the adsorption tower has a diameter of 4.8 meters and a height of 12.0 meters; after the flue gas removes sulfide and nitrogen oxides, it is discharged into the chimney. The nitrogen oxide content in flue gas is 50mg / m 3 , the sulfide content is 20 mg / m 3 .

[0042] The adsorption tower is filled with microcrystalline adsorbents for dechlorination, desulfurization, denitrification, and dust removal. After the adsorption is saturated, it automatically switches to cycle regeneration; every 7 days, it automatically switches to a tower for regeneration....

Embodiment 2

[0044] 1.16 million cubic meters of flue gas at 120°C, with a nitrogen oxide content of 450mg / m 3 , the sulfide content is 1500 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 pellets to generate steam, and the flue gas temperature drops to about 180°C; then The flue 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 spraying water is recycled, and part of the waste water is neutralized , 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...

Embodiment 3

[0048] 1.14 million cubic meters of flue gas at 130°C, with a nitrogen oxide content of 450mg / m 3 , the sulfide content is 200 mg / m 3 , the flue gas enters the denitrification tower, at 200°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 pellets to generate steam at 160°C, and the flue gas enters the automatic The heat exchanger exchanges heat with the cold flue gas entering the chimney, and the temperature is reduced to about 110°C; the temperature of the flue gas at 110°C is reduced to about 110°C through the flue gas; The spraying water is recycled, part of the waste water is neutralized, and goes 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, to...

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Abstract

The invention relates to a desulfurization and denitrification method for pelletizing sintering flue gas, and mainly aims to solve the problems of high running cost and generation of secondary pollution in an existing desulfurization and denitrification process of the pelletizing sintering flue gas. The method is characterized by removing nitrogen oxide and sulfide in the pelletizing sintering flue gas by adopting an adsorption method, and performing salt-making treatment on the nitrogen oxide and sulfide in regenerated flue gas, so that the above problems are solved well. The method can be applied to the industrial production of desulfurization and denitrification of flue gas in iron and steel plants.

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 flue gas from pellet sintering. 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 pellet sintering 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...

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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