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Low-temperature desulfurization and denitrification method for sintering flue gas

A technology for sintering flue gas, desulfurization and denitrification, applied in the field of desulfurization and denitrification, can solve the problems of high operation 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 during the sintering flue gas treatment process of the sintering machine in the existing iron and steel plant. A method for low-temperature desulfurization and denitrification of sintering flue gas is provided. 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

[0044] 1.16 million cubic meters of flue gas at 140°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 sintering 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 36...

Embodiment 2

[0046] 1.5 million cubic meters of flue gas at 130°C, with a nitrogen oxide content of 400mg / m 3 , the sulfide content is 100 mg / m 3 , 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 tower is 4.8 meters in diameter and 12.0 meters in height; after the flue gas removes sulfide and nitrogen oxides, it enters the self-heat exchanger, and after heat exchange with hot flue gas, it reaches above 100°C. Into the chimney, the nitrogen oxide content in the flue gas is 50mg / m3 3 , the sulfide content is 20 mg / m 3 . The adsorption tower is filled with...

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, and at 300°C, under the action of the copper-supported ZSM-5 molecular sieve catalyst, the nitrogen oxides are reduced to nitrogen, and the flue gas after the reaction enters the waste heat sintering 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 adsorption tower; three 200m 3 The adsorption tower, two open and on...

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Abstract

The invention discloses a low-temperature desulfurization and denitrification method for sintering flue gas, relates to a desulfurization and denitrification method for the 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 sintering flue gas. The desulfurization anddenitrification method is characterized by removing nitrogen oxide and sulfide in the 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 desulfurization and denitrification method can be applied to the industrial production of desulfurization and denitrification of the sintering 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 sintering 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 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 method are widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/60B01D53/72B01D47/06B01D53/04
CPCB01D47/06B01D53/04B01D53/60B01D53/72B01D53/75B01D2253/106B01D2258/0283B01D2259/4009Y02A50/20
Inventor 马广伟孙广亿宋晶周稳华
Owner 湖北申昙环保新材料有限公司
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