Reburning denitration biogas treatment system of garbage incineration grate furnace

Abstract

The invention is suitable for the field of household garbage incineration, and relates to a reburning denitration biogas treatment system of a garbage incineration grate furnace. The reburning denitration biogas treatment system is composed of hearth biogas back-spraying nozzles, a secondary air nozzle, a biogas conveying device, a pneumatic control valve, a pressure switch, a flame retardant device, a grate and a flue; the biogas back-spraying nozzles are arranged in front and back arch areas, and the inclination angles of the nozzles are arranged according to a hearth structure, so that flue gas is fully mixed, and the flue gas retention time is prolonged; the secondary air nozzle is arranged at the upper part of the biogas back-spraying nozzles so as to supplement oxygen to enable the combustible gas to be completely combusted; and biogas is taken from a leachate anaerobic fermentation system and is conveyed into the furnace through the biogas conveying device. According to the reburning denitration biogas treatment system, the biogas can be treated by spraying the biogas into the high-temperature oxygen-deficient area of the hearth, and meanwhile, NOx is reduced into N2; the system has the functions of adjusting the amount of biogas entering the furnace and protecting the safety of the whole system through a biogas system protection device; and according to the reburning denitration biogas treatment system, combustible substances can be completely combusted by supplementing secondary air.

Description

Technical field [0001] The present invention is suitable for the field of domestic waste incineration, especially a waste incinerator, re-burning dermal treatment biogas system. Background technique [0002] The leachate treatment station is a routine configuration facility of the waste incineration plant, and the leachate will produce a large amount of biogas such as a large amount of biogas, which can reach 24MJ / NM by anaerobic fermentation. 3 However, the general incinerator will burn the biogas through the torch, resulting in energy waste. In recent years, most waste incineration plants will set biogas burners, biogas into incinerate through the burner, so that the heat of biogas is fully utilized, but the boggle into the furnace will cause increase in the furnace, resulting in furnace coking and NOx emissions Risk of concentration increases. Inventive content [0003] Re-combustion reintegration is produced by mixing with NOx mixed with NOx in a regenerative atmosphere. 2...

AI Technical Summary

Problems solved by technology

[0002] The leachate treatment station is a conventional facility for waste incineration plants. The leachate will produce a large amount of biogas and other flammable gases after anaerobic fermentation. The biogas has a high calorific value, which can reach 24MJ / Nm 3 , but the general incineration plant will burn the biogas through the torch, resulting in energy waste

In recent years, most waste incineration plants have installed biogas burners, through which the biogas is incinerated into the furnace, so that the heat of the biogas can be fully utilized, but the combustion of biogas into the furnace will cause the temperature in the furnace to rise, resulting in coking and NOx emissions in the furnace Increased risk of elevated concentrations

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