Residual heat utilization and simultaneous desulfurization and denitrification system for tower type coke oven flue gas

Abstract

The invention discloses a residual heat utilization and simultaneous desulfurization and denitrification system for tower type coke oven flue gas. The residual heat utilization and simultaneous desulfurization and denitrification system comprises a draught fan and a flue gas purification tower, wherein the draught fan is connected with a coke oven flue and the flue gas purification tower; the flue gas purification tower comprises a hot pipe type wastewater evaporator, a crystallization tank, a flue gas oxidization reactor and a flue gas washing tower; the hot pipe type wastewater evaporator is connected with a wastewater circulating pump and a waste water tank; the hot pipe type wastewater evaporator is connected with an ammonia evaporation wastewater pump and a wastewater heat exchanger; the hot pipe type wastewater evaporator is connected with an alkali liquid metering pump and a complete condenser; the complete condenser is connected with an ammonia water cooler, an ammonia water cooler and an ammonia water pump; the ammonia water pump is connected with the flue gas washing tower; the complete condenser and the ammonia water cooler are connected with technical cooling water; the hot pipe type wastewater evaporator is connected with a flue gas heat exchanger and a light generator; the light generator is connected with the flue gas oxidization reactor; flue gas is subjected to heat exchange by the flue gas heat exchanger and then enters a main flue to be evacuated by a chimney; and the crystallization tank lifts a crystallization pump to be connected with a coke oven coal gas ammonium sulfate production system.

Description

technical field [0001] The invention relates to the technical field of coke oven flue gas waste heat utilization and desulfurization and denitrification equipment, in particular to a tower-type coke oven flue gas waste heat utilization and simultaneous desulfurization and denitrification system, which is widely used in coking equipment. Background technique [0002] In 2012, issued by the Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, the "Emission Standards for Pollutants in the Coking Chemical Industry" (GBl6171-2012) stipulated that coke oven chimneys should be SO2 from January 1, 2015. 2 and nitrogen oxide emission limits are 50mg / m 3 and 500mg / m 3 . After the promulgation and implementation of this standard, a large number of coking enterprises that use coal as processing raw material and coke oven gas as heating fuel, as well as various research institutions, are...

AI Technical Summary

Problems solved by technology

The main process route of coke oven flue gas desulfurization and denitrification that has been industrialized and is being tested is: waste heat utilization → flue gas denitrification → flue gas desulfurization, low desulfurization and denitrification efficiency, high investment, new industrial waste that is difficult to handle, and High energy consumption, demanding process conditions and other issues

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