Garbage incinerator with small NOx pollutants

Abstract

The invention provides a garbage incinerator with small NOx pollutants. The garbage incinerator comprises an incineration fire grate which is used for incinerating garbage located on an incineration fire grate, wherein burning flue gas generated by incineration is discharged from an incinerator opening through an incinerator throat area, a primary air device which is used for feeding primary air below the incineration fire grate to provide oxygen for incineration, a secondary air device which is used for providing secondary air into the incinerator through a secondary air nozzle located in theincinerator throat area so as to adjust the oxygen amount in the garbage incinerator, a first recirculating flue gas nozzle which is arranged with a secondary air nozzle in a staggered manner, and isused for feeding recirculating flue gas into the incinerator to be mixed with combustion flue gas in the incinerator, and a second recirculating flue gas nozzle which is located on a rear arch abovethe incineration fire grate and used for feeding recirculating flue gas into the combustion area to be mixed with the combustion flue gas so as to reduce the oxygen content in the incinerator. According to the garbage incinerator, the generation amount of NOx pollutants is low, stable and reliable operation is achieved, the performance of the incinerator is fundamentally improved, and the SCR denitration pressure is reduced.

Description

technical field [0001] The present application relates to the technical field of environmental protection, and more specifically relates to waste incineration. Background technique [0002] At present, there are few researches and applications of low NOx pollutants based on waste incinerators, especially the research on flue gas recirculation technology is not deep enough. It is easy to cause condensation corrosion; or only select a certain position to install the recirculation nozzle, which does not fully exert the effect of the flue gas recirculation technology. Waste incineration mostly relies on post-furnace denitrification technologies such as SNCR, SCR, etc. The SNCR denitrification process has limited efficiency, and the SCR denitrification process has high investment and operating costs, especially in terms of catalyst regeneration. Contents of the invention [0003] The present application has been made in consideration of the above-mentioned problems. The prese...

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Problems solved by technology

[0002] At present, there are few researches and applications of low NOx pollutants based on waste incinerators, especially the research on flue gas recirculation technology is not deep enough. It is easy to cause condensation corrosion; or only select a certain position to install the recirculation nozzle, which does not give full play to the effect of the flue gas recirculation technology

Waste incineration mostly relies on post-furnace denitrification technologies such as SNCR, SCR, etc. The efficiency of SNCR denitrification process is limited, and the investment cost and operation cost of SCR denitrification process are high, especially in terms of catalyst regeneration

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