Low-temperature desulfurization and denitrification method for sintering exhaust 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.

Inactive Publication Date: 2019-03-26
山东洲蓝环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 sintering flue gas treatment in existing iron and ste

Method used

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  • Low-temperature desulfurization and denitrification method for sintering exhaust gas

Examples

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Example Embodiment

[0050] [Example 1]

[0051] 160,000 cubic meters of 240℃ flue gas, nitrogen oxide content is 500mg / m 3 , The sulfide content is 200 mg / m 3 , The flue gas enters the denitrification tower, at 240 ℃, under the action of the ZSM-5 molecular sieve catalyst, nitrogen oxides are reduced to nitrogen, the flue gas after the reaction enters the waste heat sintering, steam is generated, and the flue gas temperature is reduced to about 180 ℃; The gas enters the self-heat exchanger and exchanges heat with the cold flue gas entering the chimney, and the temperature is reduced to about 110°C; the flue gas at 110°C is cooled to 50°C by spraying, and the spray water is recycled. After part of the wastewater is neutralized, De-biochemical system; the cooled flue gas enters the adsorption tower after passing through the demister; using three 200m 3 Adsorption tower, two open and one ready, each adsorption tower is filled with 120m 3 Microcrystalline material, total 360 m 3 The microcrystalline mate...

Example Embodiment

[0052] [Example 2]

[0053] The specific implementation is as attached figure 1 The device process shown is 150,000 cubic meters of flue gas at 260°C, and 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 ℃, under the action of the ZSM-5 molecular sieve catalyst, nitrogen oxides are reduced to nitrogen, the flue gas after the reaction enters the waste heat sintering, and steam is generated at 150 ℃, and the flue gas temperature is reduced to about 140 ℃; Then the flue gas enters the spray to cool down to 40℃, the spray water is recycled, and part of the wastewater is neutralized, and the biochemical system is removed; the cooled flue gas enters the adsorption tower after passing through the demister; using three 200m 3 Adsorption tower, two open and one ready, each adsorption tower is filled with 120m 3 Microcrystalline material, total 360 m 3 Microcrystalline material ZSM-5 molecular sieve; the size...

Example Embodiment

[0054] [Example 3]

[0055] The specific implementation is as attached figure 1 The device process shown, 140,000 cubic meters of flue gas at 300°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 300°C, under the action of the copper-supported ZSM-5 molecular sieve catalyst, nitrogen oxides are reduced to nitrogen. The reacted flue gas enters the waste heat sintering to produce 160°C steam, and the flue gas enters the self-exchange The heat exchanger exchanges heat with the cold flue gas entering the chimney, and the temperature is reduced to about 110°C; the flue gas temperature of 110°C is reduced to about 110°C by the flue gas; the flue gas temperature of 110°C is cooled to 50°C by spraying. After the water is recycled, part of the wastewater is neutralized, and the biochemical system is removed; the cooled flue gas enters the adsorption tower after passing through the demister; using three 200...

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Abstract

The invention relates to a method for desulfurization and denitrification of sintering exhaust gas. The method is mainly adopted for solving the problems of high running cost and secondary pollution of present desulfurization and denitrification for sintering exhaust gas. According to the invention, the technical scheme of adopting an absorbing method for removing nitric oxide and sulfide from sintering exhaust gas and then performing salt-production treatment on nitric oxide and sulfide in the regenerated exhaust gas is adopted for solving the problems. The method can be applied to industrialproduction of exhaust gas desulfurization and denitrification in steelworks.

Description

Technical field [0001] The invention belongs to the technical field of desulfurization and denitration, and specifically relates to a method for desulfurization and denitration of sintering flue gas. Background technique [0002] SO 2 And NO X They are all important air pollutants in my country. Excessive emissions will cause haze, acid rain and photochemical smog, which will seriously harm the ecological environment and human health. The burning of fossil fuels is SO 2 And NO X Main source. Coal is the most important natural energy source in my country. As the second largest coal-using field in China, coal coking is one of the main pollution sources in the industrial coal field, and sintering flue gas is an important source of atmospheric pollution. [0003] At present, wet desulfurization technology and semi-dry desulfurization technology represented by ammonia method, lime / limestone method, two-alkali method, magnesium oxide method, etc. are widely used in the field of sinterin...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56B01D53/48B01D53/50B01D53/78B01D53/02B01D46/00F23J15/06F23J15/04
CPCB01D46/0036B01D53/02B01D53/48B01D53/502B01D53/78B01D53/8628B01D2251/102B01D2251/104B01D2251/106B01D2255/104B01D2255/2061B01D2255/2063B01D2255/2065B01D2255/20761B01D2255/502B01D2255/504B01D2257/30B01D2257/40B01D2258/0283B01D2259/4009F23J15/04F23J15/06
Inventor 张燎原梁军杜军
Owner 山东洲蓝环保科技有限公司
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