Coke oven flue gas low-temperature SCR denitration and waste heat recycling integrated device and process

A coke oven flue gas and waste heat recovery technology, applied in gas treatment, lighting and heating equipment, process efficiency improvement and other directions, can solve problems such as blockage of heat exchangers, anticorrosion of original chimneys, deactivation of catalysts, etc. , avoid anti-corrosion transformation, the effect of low flue gas leakage rate

Pending Publication Date: 2018-10-23
南京东大能源工程设计院有限公司
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Problems solved by technology

[0008] Aiming at the existing technical problems in the coke oven flue gas denitrification technology, such as catalyst deactivation, heat exchanger blockage, original chimney anti-corrosion and technical defects that need to be shut down for maintenance

Method used

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  • Coke oven flue gas low-temperature SCR denitration and waste heat recycling integrated device and process
  • Coke oven flue gas low-temperature SCR denitration and waste heat recycling integrated device and process

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Embodiment

[0039] This embodiment provides a sub-bin type low-temperature SCR denitration process in which coke oven flue gas is returned to the original chimney and discharged. The coke oven flue gas removes the tar in the flue gas before entering the low-temperature SCR denitration catalyst, removes the nitrogen oxides in the flue gas through the SCR reaction, reduces the temperature through the flue gas heat exchanger, and enters the subsequent desulfurization and dust removal system. The final purification process The flue gas enters the flue gas heat exchanger and is heated to above 140°C, enters the original chimney and is discharged, and finally meets the ultra-low emission transformation requirements of the iron and steel enterprise, including the underground flue 2, ammonia gasification device, and denitration reaction connected to the coke oven chimney 1 in sequence The ammonia gasification device includes the ammonia gasifier 3 and the burner 4 arranged in the main flue, and the...

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Abstract

The invention relates to the field of coke oven low-temperature SCR denitration, in particular to a coke oven flue gas low-temperature SCR denitration and waste heat recycling integrated device and process. The device comprises an underground flue, an ammonia water gasification device, a denitration reactor, an induced draft fan, a desulfurization tower and a dust remover which are sequentially connected with a coke oven chimney. By the device, the technological defects of catalyst deactivation, heat exchanger blocking, poor chimney corrosion resistance and shutdown-required maintenance in theexisting coke oven flue gas denitration technology are overcome. The device is high in denitration efficiency, low in ammonia escape rate, free of catalyst blocking, long in catalyst service life, good in chimney corrosion resistance, simple in structure and low in cost.

Description

Technical field [0001] The invention relates to the field of low-temperature SCR denitration of coke oven flue gas, in particular to an integrated device and process for low-temperature SCR denitration and waste heat recovery of coke oven flue gas. Background technique [0002] The emission concentration index of SO2, NOx and dust particulate matter in the coke oven flue gas of the coking industry, when the baseline oxygen content is 8%, the particulate matter concentration is 10mg / Nm3, the SO2 concentration is 30mg / Nm3, the NOx concentration is 150mg / Nm3, and The flue gas after purification is required to be discharged back to the original chimney. The current low-temperature SCR denitrification technology used in coke oven flue gas is derived from the mature SCR denitrification technology used in coal-fired power plants, using catalysts with a lower active temperature range. [0003] The SO2 in the coke oven flue gas is produced by the combustion of the sulfide contained in the ...

Claims

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Application Information

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IPC IPC(8): B01D53/90B01D53/56F27D17/00
CPCB01D53/8631B01D53/90F27D17/004F27D17/008B01D2258/0283B01D2251/2062Y02P10/25
Inventor 吴林虎许建国王逸文张雷杨琨
Owner 南京东大能源工程设计院有限公司
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