Special single-bin heating regeneration denitration system for low-temperature flue gas, and denitration method

Abstract

The invention discloses a special single-bin heating regeneration denitration system for low-temperature flue gas. The system comprises a low-temperature denitration system, a reheating system and an online ash removal system. In the system, a denitration catalyst has very high low-temperature denitration capacity; the reheating system is capable of heating every independent bin separately alone so as to enable the catalyst to recover activity; the online ash removal system has the advantages of being simple in structure, less in investment, convenient to operate, etc. After the low-temperature flue gas passes through the system, nitrogen oxides are reduced into nitrogen and water. The system is simple to operate, small in floor space, high in efficiency and low in cost.

Description

Technical field: [0001] The invention relates to a special single chamber heating regeneration denitrification system and a denitrification method for low-temperature flue gas, belonging to the field of air pollution control of coking ovens. Background technique: [0002] Coke is formed by heating coal in the carbonization chamber of a coke oven under air-isolated conditions and undergoing a series of complex processes of physical changes and chemical reactions. The coke oven gas produced during coke carbonization contains pollutants such as sulfur dioxide and nitrogen oxides, which will generate new pollution in the subsequent use process. These sulfur dioxide and nitrogen oxides are important components of PM2.5 particulate matter, and are also the main cause of acid rain and smog. Its production mechanism is: the heat source of the carbonization chamber is provided by a certain proportion of coke oven gas and blast furnace gas heating the vertical fire channel, and the w...

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Problems solved by technology

[0003] The exhaust gas temperature of the existing coke oven flue is relatively low, generally around 160-320°C; the common denitrification catalysts currently on the market cannot meet the existing conditions, and the operating cost will be too high if the flue gas heating method is used, so this system uses a Low temperature denitrification catalyst

Because the catalyst will generate viscous substances such as ammonium bisulfate under the condition of low temperature and sulfur content to block the catalyst, the operating cost will be too high if the flue gas is heated

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