Downstream low-nitrogen combustion waste incinerator and combustion method thereof

Abstract

The invention relates to a downstream low-nitrogen combustion waste incinerator and a combustion method thereof. The front end of the incinerator is covered with a furnace arch of the combustion furnace. A flue is arranged on the tail of the incinerator. The downstream low-nitrogen combustion waste incinerator is characterized in that the waste incinerator further comprises a first air extraction port and an air duct main pipe, wherein the first air extraction port is arranged above the furnace arch at the front end of the incinerator; the two ends of the air duct main pipe are communicated with the first air extraction port and the flue respectively; a draught fan is further arranged on the air duct main pipe so that smoke, containing reducing gas, at the front end of the incinerator can be extracted at the first air extraction port and be sprayed into the flue. The downstream low-nitrogen combustion waste incinerator and the combustion method thereof have the advantages that (1) NOX in the smoke at an outlet of the incinerator is reduced by extracting the reducing gas in the incinerator, and no extra reducing agent consumption is needed compared with selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR); and (2) the incinerator and the combustion method thereof are suitable for the working condition that the heat value of waste is high, extracted gas in the incinerator is located in a drying section of the incinerator, the smoke temperature of the area is low, and thus the situation that the system stops due to the fact that the air extraction temperature is too high is prevented.

Description

technical field [0001] The invention relates to the field of garbage incineration, in particular to a downstream low-nitrogen combustion garbage incinerator and a combustion method thereof. Background technique [0002] During the use of domestic waste incineration grate, the function of feeding grate is very critical, and its reliability directly affects the reliability of the entire incinerator and even the entire incineration power plant, thus affecting the domestic waste treatment capacity and economic benefits. [0003] Most of the existing waste incinerators use mechanical waste incinerators. figure 1 The shown garbage incinerator is just one of them. Such as figure 1 As shown, the waste incinerator includes a feed inlet 101, a feed grate 102, a fire grate 103 for waste incineration located in the furnace, a primary air supply system 104 located at the lower part of the incinerator grate, and a The secondary air supply system 105 and the slag discharger 106. In ad...

AI Technical Summary

Problems solved by technology

In the field of waste incineration, the existing low-nitrogen combustion technology is mainly flue gas recirculation technology, that is, a certain amount of flue gas is extracted from the waste heat boiler or the flue gas purification system, and the extracted flue gas is recycled through the nozzles in the furnace. Denitrification is put into the furnace again to reduce the oxygen content in the furnace, thereby suppressing the NOx produced during the combustion process, but this technology has high equipment costs and high operation and maintenance costs

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