Method for desulfurization and denitration of sintering flue gas

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

Pending Publication Date: 2019-04-02
马广伟
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  • 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 steel plants. It provides a method for low-temperature desulfurization and denitrification of sintering flue gas. , low equipment investment, simple regeneration, low energy consumption, and no secondary pollution

Method used

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  • Method for desulfurization and denitration of sintering flue gas

Examples

Experimental program
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Effect test

Embodiment 1

[0050] 1.6 million 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 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 360...

Embodiment 2

[0052] The specific implementation is as attached figure 1 The shown device flow, 1.5 million 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 denitration tower, at 240°C, under the action of 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 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 adsor...

Embodiment 3

[0054] The specific implementation is as attached figure 1 The shown device process, 1.4 million 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-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 enter...

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Abstract

The invention relates to a method for desulfurization and denitration of sintering flue gas. The problems that an existing technique for desulfurization and denitration of sintering flue gas has highoperation cost and secondary pollution are solved mainly. According to the technical scheme, an adsorption method is adopted to remove nitrogen oxides and sulfides in the sintering flue gas, and saltmanufacturing treatment is performed on nitrogen oxides and sulfides in regenerated flue gas, so that the problems are solved well; and the method can be applied to industrial production of desulfurization and denitration of flue gas in 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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IPC IPC(8): B01D53/86B01D53/56B01D53/48B01D53/50B01D53/78B01D53/02B01D46/00F23J15/06F23J15/04
CPCB01D46/0036B01D53/02B01D53/48B01D53/502B01D53/78B01D53/8628B01D2251/102B01D2251/104B01D2251/106B01D2253/108B01D2255/104B01D2255/2045B01D2255/2047B01D2255/2061B01D2255/2063B01D2255/2065B01D2255/20761B01D2255/50B01D2255/502B01D2255/504B01D2257/2064B01D2257/30B01D2257/40B01D2258/0283B01D2259/4009F23J15/04F23J15/06
Inventor 张胜全张燎原杜军
Owner 马广伟
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