Heat accumulating type steel rolling heating furnace low-temperature flue gas desulfurization and denitrification system and method

Abstract

The invention provides a heat accumulating type steel rolling heating furnace low-temperature flue gas desulfurization and denitrification system and method. The heat accumulating type steel rolling heating furnace low-temperature flue gas desulfurization and denitrification system comprises a soot flue gas desulfurization and denitrification device and an air-smoke flue gas desulfurization device; the soot flue gas desulfurization and denitrification device comprises a soot dry type desulfurization and dust removal mechanism, a soot secondary heat exchanger and a soot SCR (Selective Catalytic Reduction) denitrification reactor which are communicated in sequence; and the air-smoke flue gas desulfurization device comprises an air-smoke heating mixer, an air-smoke dry-type desulfurization and dust removal mechanism and an air-smoke SCR (Selective Catalytic Reduction) denitration reactor which are communicated in sequence. According to the heat accumulating type steel rolling heating furnace low-temperature flue gas desulfurization and denitrification system, the soot flue gas and the air-smoke flue gas are subjected to desulfurization and denitrification treatment respectively, the problem that the soot flue gas and the air-smoke flue gas are inflammable and explosive after being mixed is avoided, the treated flue gas meets the environmental protection requirement, the soot flue gas and theair-smoke flue gas are heated by utilizing flue gas waste heat, a the effects of energy conservation, consumption reduction, safety and environmental protection are achieved, the occupied area is reduced, and the one-time investment cost and the operation cost are saved.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment of a regenerative steel rolling heating furnace, in particular to a low-temperature flue gas desulfurization and denitrification system and method of a regenerative steel rolling heating furnace. Background technique [0002] The regenerative steel rolling heating furnace is the key equipment required in the steel rolling process, and the production process will produce particulate matter, SO 2 , NO X and other harmful substances. With the increasingly stringent environmental protection emission standards, the country's efforts to control pollution continue to increase. At present, the treatment of flue gas emissions from steel rolling heating furnaces has gradually begun. To achieve: when the benchmark oxygen content is 8% , the particle emission concentration is less than or equal to 10mg / m 3 , the emission concentration of sulfur dioxide is less than or equal to 50mg / m 3 , nitroge...

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Problems solved by technology

[0008] 5. The oxygen content in the flue gas of the heating furnace is low, usually about 2-6%, and the oxygen content may be as high as 6-10% due to production load or improper operation;

[0011] At present, flue gas desulfurization and denitrification processes such as sintering, pelletizing, and coke ovens in the domestic iron and steel industry are relatively mature, but the flue gas temperature of the regenerative steel rolling heating furnace is relatively low, and NOX, SO 2 The content is relatively high, the water content is high, and the dew point temperature is low. If the flue gas desulfurization and denitrification process is adopted, it must be restricted by the flue gas conditions and affect the use and effect of desulfurization and denitrification.

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