System for guaranteeing smoke ultra-clean emission through boiler ventilation air methane

Abstract

The invention particularly relates to a system for guaranteeing smoke ultra-clean emission through boiler ventilation air methane. The system is composed of a ventilation air methane extraction device, a ventilation air methane automatic distribution device, an anti-backflow device, a primary fan, a sulfur and nitrogen pollutant on-line monitoring device, an on-line metering device, an oxygen quantity monitoring and analyzing device, a coal feeding quantity adjusting and controlling device and a central data analyzing and processing system. By extracting the boiler ventilation air methane withthe oxygen quantity being 14% or so, the boiler oxygen quantity of 21% or so is controlled to be decreased, oxygen-enriched combustion of a boiler turns into micro-oxygen-debt combustion, generationof SO2 and NOx is suppressed or reduced in the combustion process, the whole system is analyzed and integrated through the central data analyzing and processing system, cloud platform integration of the ventilation air methane, the boiler combustion working condition, the oxygen quantity and desulfurization and denitrification data is achieved, highly automatic control is achieved, the emission total amount of atmospheric pollutants is greatly decreased, environmental pollution is reduced, and low-carbon harmonious development of enterprises is effectively promoted.

Description

technical field [0001] The invention belongs to a boiler exhaust air utilization and distribution system, in particular to a system for utilizing boiler exhaust air to ensure ultra-clean discharge of flue gas. Background technique [0002] The main processes adopted for desulfurization of coal-fired boilers are wet desulfurization, double-alkali desulfurization, and semi-dry desulfurization. At present, the most widely used desulfurization process with mature technology is wet desulfurization, which is widely used in China. This process mainly consumes a large amount of desulfurization agent limestone and water resources, through the reaction of limestone slurry with sulfur in the flue gas, SO 2 Converted to calcium sulfate and calcium sulfite, so as to achieve the purpose of flue gas desulfurization purification. [0003] The denitrification process is mainly SCR selective catalytic reduction method and SNCR non-selective catalytic reduction method. A large amount of denit...

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Problems solved by technology

[0004] The above desulfurization process needs to consume a large amount of limestone resources and water resources. The high chloride ion sewage generated in the desulfurization process needs to be treated and discharged after reaching the standard.

The denitrification process requires a large amount of ammonia water and consumes a large amount of water resources

This kind of desulfurization and denitrification process has high construction investment and operating costs, large area, high energy consumption, long construction period and consumes a large amount of non-renewable resources, which affects the sustainable development of the country and society.

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