Coke oven flue gas desulfurization, denitration and waste heat recovery integrated method

A waste heat recovery and waste heat recovery device technology, applied in chemical instruments and methods, separation methods, chemical industry, etc., can solve the problems of low desulfurization, denitrification efficiency, and inability to meet the optimal temperature for desulfurization, so as to reduce costs and reduce operation Cost, the effect of simplifying the process

Inactive Publication Date: 2015-09-23
JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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Problems solved by technology

The optimal temperature for denitrification is between 300-400°C, the optimum reaction temperature for wet desulfurization is between 100-150°C, and the temperature of coke oven flue gas is generally between 160-210°C, which cannot meet the requirements of desulfurization and denitrification. Optimum temperature, resulting in low desulfurization and denitrification efficiency

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  • Coke oven flue gas desulfurization, denitration and waste heat recovery integrated method

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Embodiment Construction

[0021] 1. The flue gas temperature from the coke oven is about 100-210℃, and the sulfur dioxide content is 100-3500mg / Nm 3 , the content of nitrogen oxides is 100-1500mg / Nm 3 . The flue gas first enters the heating furnace and heats up to 300-400°C. This temperature is most conducive to denitrification to achieve a higher denitrification efficiency.

[0022] 2. The flue gas from the heating furnace enters the flue gas denitration device, and the 300-400 ℃ flue gas from the heating furnace enters the denitrification device to remove nitrogen oxides. The flue gas denitrification device uses ammonia as a reducing agent to remove nitrogen in the flue gas oxides, the denitrification efficiency can reach 83-90%. Ammonia comes from the ammonia supply system.

[0023] 3. The flue gas temperature from the flue gas denitrification device is still 300-400°C, and the flue gas has a lot of residual heat, which enters the waste heat recovery device (waste heat boiler) to recover the heat...

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Abstract

The invention relates to a coke oven flue gas desulfurization, denitration and waste heat recovery integrated method. Flue gas from a coke oven firstly enters a heating furnace to be heated to 300 to 400 DEG C, and then the flue gas enters a denitration device for removing nitrogen oxide in the flue gas through a denitration reducer and a denitration catalyst, wherein the denitration reducer is ammonia; and the flue gas discharged from the denitration device is subjected to heat recovery through a waste heat recovery device and cooled to 100 to 150 DEG C, and then the flue gas enters an ammonia desulfurization device for removing sulfur dioxide in the flue gas. Both a desulfurization absorbent and the denitration reducer in the method are ammonia, and public ammonia is supplied to a system, so that operation and maintenance work is reduced. The heating furnace for heating and the waste heat recovery device are arranged, so that the flue gas temperature reaches the optimal denitration and desulfurization reaction temperatures respectively, relatively high denitration and desulfurization efficiency can be achieved, and flue gas waste heat can be recycled for greatly reducing the operation cost of coke oven flue gas treatment.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a process method and a device for the removal of gaseous pollutants sulfur dioxide and nitrogen oxides in coke oven flue gas and the integrated recovery and utilization of coke oven flue gas heat. Background technique [0002] The main gaseous pollutants of coke oven flue gas are sulfur dioxide and nitrogen oxides. At present, the main process for the treatment of gaseous pollutants in coke oven flue gas is: the flue gas from the coke oven combustion chamber first enters the selective catalytic reduction denitrification device to remove nitrogen oxides, and the coke oven flue gas from the denitrification device enters the wet desulfurization The device removes sulfur dioxide from the flue gas and discharges it into the chimney. The optimal temperature for denitrification is between 300-400°C, the optimum reaction temperature for wet desulfurization is between 100-150°C, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/56B01D53/50B01D53/73C01C1/24
CPCY02P20/10Y02P20/129Y02P20/50
Inventor 罗静陈海峰徐长香祁丽昉
Owner JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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