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Pelletizing smoke gas low-temperature desulfurization and denitrification method

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

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 pelletizing flue gas treatment in existing iron and steel plants. It provides a method for low-temperature desulfurization and denitrification of pelletizing flue gas. The treatment method has Short process, low equipment investment, simple regeneration, low energy consumption, and no secondary pollution

Method used

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  • Pelletizing smoke gas low-temperature desulfurization and denitrification method

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Effect test

Embodiment 1

[0047] 1.6 million cubic meters of flue gas at 240°C with a nitrogen oxide content of 500mg / m 3 , with a sulfide content of 200 mg / m 3 , the flue gas enters the denitrification tower, at 240 °C, under the action of ZSM-5 molecular sieve catalyst, nitrogen oxides are reduced to nitrogen gas, the reacted flue gas enters the cooling tower, and is cooled to 50 °C by spraying, and the spray water is recycled through the use of , after neutralization of part of the wastewater, go to the biochemical system; the cooled flue gas enters the adsorption tower after passing through the defogging equipment; three 200m 3 Two adsorption towers are opened and one prepared, and each adsorption tower is filled with 120m 3 Microcrystalline material, total 360 m 3 Microcrystalline material mordenite; the adsorption tower is 4.8 meters in diameter and 12.0 meters high; after the flue gas is removed sulfide and nitrogen oxides, it enters the chimney for discharge, and the nitrogen oxide content in...

Embodiment 2

[0049] The specific implementation is as attached figure 1 The shown device flow, 1.5 million cubic meters of flue gas at 260°C, nitrogen oxide content of 400mg / m 3 , with a sulfide content of 100 mg / m 3 , the flue gas enters the denitrification tower, at 240 °C, under the action of ZSM-5 molecular sieve catalyst, nitrogen oxides are reduced to nitrogen, the reacted flue gas enters the cooling tower, sprayed to cool down to 40 °C, and the spray water is recycled for use, Part of the wastewater is neutralized, and then goes to the biochemical system; the cooled flue gas passes through the demisting equipment and then enters the adsorption tower; three 200m 3 Two adsorption towers are opened and one prepared, and each adsorption tower is filled with 120m 3 Microcrystalline material, total 360 m 3 Microcrystalline material ZSM-5 molecular sieve; the size of the adsorption tower is 4.8 meters in diameter and 12.0 meters in height; after removing sulfide and nitrogen oxides from...

Embodiment 3

[0051] The specific implementation is as attached figure 1 The shown device process, 1.4 million cubic meters of flue gas at 300 ° C, nitrogen oxide content of 450 mg / m 3 , with a sulfide content of 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, and the reacted flue gas enters the waste heat pellet to generate 160 °C steam, and the flue gas enters the 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 temperature; the flue gas of 110 °C is cooled to 50 °C by spraying, spraying The water spray is recycled, and some waste water is neutralized before going to the biochemical system; the cooled flue gas enters the adsorption tower after passing through the defogging equipment; three 200m 3 Tw...

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Abstract

The invention relates to a pelletizing smoke gas desulfurization and denitrification method, which mainly solves the problems of high operation cost and secondary pollution generation of the existingpelletizing smoke gas desulfurization and denitrification. The method has the technical scheme that an adsorption method is used for eliminating nitric oxides and sulfides in pelletizing smoke gas; the nitric oxides and sulfides in the regenerated smoke gas are subjected to salt preparation treatment. 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 pelletized flue gas. Background technique [0002] SO 2 and NO X They are all 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. 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 sources of pollution in the field of industrial coal use, and pellet flue gas is an important source of air pollution. [0003] At present, the wet desulfurization technology and semi-dry desulfurization technology represented by ammonia method, lime / limestone method, double alkali method, and magnesium oxide method are widely us...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56B01D53/48B01D53/50B01D53/78B01D53/02B01D46/00F23J15/06F23J15/04
CPCB01D46/0036B01D53/02B01D53/48B01D53/502B01D53/78B01D53/8628B01D2251/102B01D2251/104B01D2251/106B01D2253/108B01D2255/104B01D2255/2061B01D2255/2063B01D2255/2065B01D2255/20761B01D2255/50B01D2255/502B01D2255/504B01D2257/30B01D2257/40B01D2258/0283B01D2259/4009F23J15/04F23J15/06
Inventor 梁军张燎原杜军
Owner 山东洲蓝环保科技有限公司
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