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A system and process for comprehensive emission reduction of sintering flue gas pollutants

A technology of sintering flue gas and sintering machine, which is applied in the field of metallurgical industry, can solve the problems of large operating load of desulfurization and denitrification devices, and cannot process CO at the same time, and achieve great promotion value, small transformation and simple realization

Active Publication Date: 2020-01-17
钢研晟华科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a system and process for comprehensive emission reduction of sintering flue gas pollutants, to solve the problem that the desulfurization and denitrification devices have a large operating load and cannot simultaneously process CO during sintering flue gas treatment

Method used

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  • A system and process for comprehensive emission reduction of sintering flue gas pollutants

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A sintering machine 1 has a total of 24 bellows. The 14 bellows for denitrification flue gas near the machine head are connected to flue A 2, and the remaining 10 bellows for flue gas requiring desulfurization are connected to flue B 11. The flue gas volume of flue gas to be denitrated in flue A 2 is 1 million Nm 3 , the particle concentration is 5g / m 3 , SO 2 The concentration is 95mg / m 3 , NOx concentration is 500mg / m 3 , CO concentration is 11000mg / m 3 , the flue gas temperature is 80°C.

[0043] The flue gas to be denitrated in flue A 2 first passes through the first dust collector 3 to reduce the concentration of particulate matter in the flue gas to 45mg / m 3 , and then through the first induced draft fan 4, then the denitrification flue gas in A flue 2 is used as the boiler fuel gas to replace all or part of the air, and the oxygen in the denitrification flue gas is used as a combustion gas, The flue gas is mixed with the pulverized coal injected by the boil...

Embodiment 2

[0047] A sintering machine 1 has a total of 28 bellows. The 17 bellows for flue gas requiring denitrification near the machine head are connected to flue A 2, and the remaining 11 bellows for flue gas requiring desulfurization are connected to flue B 11 through the desulfurization outlet. The amount of flue gas that needs to be denitrated in flue 2 of A is 1.2 million Nm 3 , the particle concentration is 5.5g / m 3 , SO 2 The concentration is 96mg / m 3 , NOx concentration is 360mg / m 3 , CO concentration is 9500mg / m 3 , the flue gas temperature is 85°C.

[0048] The flue gas to be denitrated in flue A 2 first passes through the first dust collector 3, and the concentration of particulate matter in the flue gas to be denitrated will be reduced to 46mg / m 3 , and then through the first induced draft fan 4, then the denitrification flue gas in A flue 2 is used as the boiler fuel gas to replace all or part of the air, and the oxygen in the denitrification flue gas is used as a com...

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Abstract

The invention relates to the field of metallurgy and particularly provides a system and process for comprehensive treatment of sintering fume. The system comprises a sintering machine (1), a flue A (2), a denitration device, a boiler (5), a flue B (13) and a flue B desulfuration device (16), wherein one end of the flue A (2) is connected with a front half of a draught distributing box of the sintering machine (1), and one end of the flue B (13) is connected with a rear half of the draught distributing box of the sintering machine (1); the other end of the flue A (2) is connected with the boiler (5), and the boiler (5) is connected with the denitration device; and the other end of the flue B (13) is connected with the flue B desulfuration device (16). According to the system and the process, one part of the sintering fume is directly subjected to desulfuration, and the other part of the sintering fume is subjected to denitration and CO removal treatment, so that the volume of desulfurated and denitrated fume is greatly reduced; and meanwhile, the fume needing denitration and CO removal are separately subjected to CO removal and denitration treatment by using a combustion system and a denitration device of the existing boiler, so that the aim of removing multiple pollutants by low cost is achieved.

Description

technical field [0001] The invention relates to the field of metallurgical industry, in particular to a system and process for comprehensive emission reduction of sintering flue gas pollutants. Background technique [0002] The biggest source of pollution in iron and steel enterprises comes from the sintering process, and the average SO in the sintering flue gas produced by the sintering process 2 Concentration at 1000mg / m 3 Above, NOx concentration is 400mg / m 3 above. In the latest flue gas emission standard for sintering machines promulgated in 2012, the flue gas emission standard for general new sintering machines is that the particle concentration is 50mg / m 3 Within, SO 2 Concentration≤200mg / m 3 , NOx concentration≤300mg / m 3 , and in June 2017, the Ministry of Environmental Protection issued the "Letter on Soliciting Opinions on 20 National Pollutant Discharge Standard Amendments (Draft for Comment)" including "Steel Sintering and Pellet Industry Air Pollutant Emis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/50B01D53/56F23G7/06F27D17/00
CPCB01D53/50B01D53/56B01D53/75B01D2258/0283F23G7/06F27D17/008Y02P10/25
Inventor 王锋沈朋飞何鹏齐渊洪严定鎏林万舟
Owner 钢研晟华科技股份有限公司