Coke oven flue gas desulfurization, dust removal and denitrification integrated system

Abstract

The invention belongs to the technical field of environmental protection for flue gas purification and resource utilization and particularly relates to a coke oven flue gas desulfurization, dust removal and denitrification integrated system. The system has a wide application range, high safety and reliability, strong feasibility, high desulfurization and denitrification efficiency, low ammonia slip rate, no waste liquid emission, a high heat utilization rate and low operating cost. The desulfurization, dust removal and denitrification integrated system realizes integration of a bag dedusting technology and a selective catalytic reduction denitrification technology. The desulfurized flue gas enters the dust removal and denitrification integrated system, is subjected to bag dedusting and then is fully mixed with ammonia fed through an ammonia injection device, and the mixed flue gas enters a denitrification catalyst layer and undergoes a denitrification reaction under the action of the denitrification catalyst so that NOX is removed. The system is widely used in the technical field of coke oven flue gas desulfurization and denitrification.

Description

technical field [0001] The invention belongs to the environmental protection technical field of flue gas purification and resource utilization, and in particular relates to an integrated system for desulfurization, dust removal and denitrification of coke oven flue gas. Background technique [0002] The air pollutants emitted by coke oven chimneys are the waste gas produced after the combustion of coke oven gas, mainly including SO2, NOx and soot. As the country pays more and more attention to air pollution control, the control of coke oven flue gas pollutants is imminent. According to the "Coking Chemical Industry Pollutant Discharge Standard (GB16171-2012)", from January 1, 2015, the existing coking enterprises need to implement a particle concentration of 30mg / m 3 , sulfur dioxide 50mg / m 3 , nitrogen oxides 500mg / m 3 According to this standard, only a few enterprises can meet the emission limit value. Usually after desulfurization and dust removal, particulate matter ...

AI Technical Summary

Problems solved by technology

The dust in the coking flue gas is mainly coal dust and coke dust, which are high in content and complex in composition. If the high dust arrangement is adopted, it will easily cause catalyst blockage, wear and alkali metal poisoning. In severe cases, it will cause shutdown of the furnace and cause heavy losses.

Images