Smoke air preheater for increasing garbage incineration primary combustion supporting air temperature

Abstract

The invention relates to a smoke air preheater for increasing the garbage incineration primary combustion supporting air temperature. A primary draught fan sucking primary air is included and connected with an air suction port above a garbage bin, pipeline communication with a steam air preheater is conducted, the primary air sequentially passes through a primary air pipe inlet and a smoke air preheater inlet header, and passes through a heat exchange pipe, communicates with a smoke air preheater outlet header and finally communicates with various primary air chambers of an incinerator througha primary air pipe outlet. After primary combustion supporting air is heated to 180-200 DEG C through the steam air preheater, the primary combustion supporting air is conveyed to the smoke air preheater at the front end of an economizer through an air pipe for continuous air temperature increasing, and the smoke air preheater can be placed between a medium-temperature overheater and a low-temperature overheater so that the primary air temperature increasing requirement can be met. By means of the smoke air preheater, high-temperature corrosion caused to the smoke air preheater from high-temperature smoke sections of 600 DEG C or above can be avoided, and meanwhile it is guaranteed that the primary air temperature can be heated to the high temperature section.

Description

technical field [0001] The invention relates to a combustion air system for waste incineration, which is a device applied to a waste incinerator to heat the temperature of primary combustion-supporting air, also known as a primary air device. Background technique [0002] Air preheater is a device used to heat combustion air for combustion, usually including: primary air preheater, secondary air preheater, etc. [0003] In traditional coal-fired power plants, the air preheater adopts flue gas-air heat exchange, and is usually placed at the end of the flue at the boiler tail, that is, the rear end of the economizer, and usually one or more groups of air preheaters are placed. However, in a waste incineration power plant, due to the diversity and complexity of waste components, the instability of combustion conditions, and the large amount of impurities and particulate matter contained in the flue gas generated by waste incineration, the air preheating of waste incineration po...

AI Technical Summary

Problems solved by technology

However, in actual operation, the working conditions of the high-temperature flue gas air preheater are far worse than the design requirements, and the actual inlet flue temperature will exceed 650°C, reach 700°C, or even higher

Although the heat exchange tubes are protected by refractory castables, due to the difference in expansion coefficient between the heat exchange tubes and refractory castables, the refractory castables are prone to peeling off when exposed to high-temperature flue gas for a long time, causing the heat exchange tubes Pipe explosion accident caused by direct exposure to smoke environment

And with the implementation of waste classification and the increase of the calorific value of waste, this type of high-temperature flue gas air preheater is less and less used in waste incineration projects

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