Sintering smoke gas low-temperature desulfurization and denitrification method

Abstract

The invention relates to a sintering smoke gas low-temperature desulfurization and denitrification method, which mainly solves the problems of high operation cost and secondary pollution generation ofthe existing sintering smoke gas desulfurization and denitrification. The method has the technical scheme that a microcrystalline material adsorption method is used for eliminating nitric oxides andsulfides in the sintering smoke gas; the nitric oxides and sulfides in the regenerated smoke gas are oxidized to be used as resources. The problems are well solved. The method can be used in the industrial production of steel and iron factory smoke gas desulfurization and denitrification.

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 ...

Examples

Embodiment 1

[0045] 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 , enter waste heat sintering, generate steam, and the flue gas temperature is reduced to about 180°C; the flue gas at 180°C is cooled to 50°C by spraying, and the spray water is recycled, and part of the waste water is neutralized and removed to the biochemical system; After the flue gas passes through the demisting equipment, it 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 mordenite; the adsorption tower has a diameter of 4.8 meters and a height of 12.0 meters; after the flue gas removes sulfides and nitrogen oxides, it enters the self-heat exchanger, and after heat exchange with the hot flue gas, it reaches above 100°C and enters the chimney emission, the nitrogen oxide content in the flu...

Embodiment 2

[0047] 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 , enter waste heat sintering, generate steam at 150°C, and the temperature of flue gas is reduced to about 120°C; the flue gas at 120°C is cooled to 40°C by spraying, and the spray water is recycled, and part of the waste water is neutralized and then removed to the biochemical system; cooling The final flue gas enters the adsorption tower after passing through the demisting equipment; 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 hea...

Embodiment 3

[0049] The specific implementation is as attached figure 1 The shown device flow, 1.4 million cubic meters of flue gas at 140°C, the nitrogen oxide content is 450mg / m 3 , the sulfide content is 200 mg / m 3 , enter waste heat sintering, generate steam at 160°C, and the temperature of flue gas 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, and part of the waste water is neutralized and removed to the biochemical system; cooling The final flue gas enters the adsorption tower after passing through the demisting equipment; 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 sulfides and nitrogen oxides, it enters the self-heat exchanger, and after heat ex...

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 ...

Examples

Embodiment 1

[0045] 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 , enter waste heat sintering, generate steam, and the flue gas temperature is reduced to about 180°C; the flue gas at 180°C is cooled to 50°C by spraying, and the spray water is recycled, and part of the waste water is neutralized and removed to the biochemical system; After the flue gas passes through the demisting equipment, it 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 mordenite; the adsorption tower has a diameter of 4.8 meters and a height of 12.0 meters; after the flue gas removes sulfides and nitrogen oxides, it enters the self-heat exchanger, and after heat exchange with the hot flue gas, it reaches above 100°C and enters the chimney emission, the nitrogen oxide content in the flu...

Embodiment 2

[0047] 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 , enter waste heat sintering, generate steam at 150°C, and the temperature of flue gas is reduced to about 120°C; the flue gas at 120°C is cooled to 40°C by spraying, and the spray water is recycled, and part of the waste water is neutralized and then removed to the biochemical system; cooling The final flue gas enters the adsorption tower after passing through the demisting equipment; 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 hea...

Embodiment 3

[0049] The specific implementation is as attached figure 1 The shown device flow, 1.4 million cubic meters of flue gas at 140°C, the nitrogen oxide content is 450mg / m 3 , the sulfide content is 200 mg / m 3 , enter waste heat sintering, generate steam at 160°C, and the temperature of flue gas 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, and part of the waste water is neutralized and removed to the biochemical system; cooling The final flue gas enters the adsorption tower after passing through the demisting equipment; 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 sulfides and nitrogen oxides, it enters the self-heat exchanger, and after heat ex...

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