Smoke waste heat recovery system and method for biomass circulating fluidized bed boiler

Abstract

The invention discloses a smoke waste heat recovery system and method for a biomass circulating fluidized bed boiler. The smoke waste heat recovery system for the biomass circulating fluidized bed boiler comprises a high-temperature economizer, a low-temperature economizer and an air preheater. The smoke waste heat recovery system for the biomass circulating fluidized bed boiler is characterized in that the air preheater is independently arranged below a horizontal flue of the boiler; primary air and secondary air are guided in from the space below the air preheater through cold air ducts correspondingly and exchange heat with supplied water flowing in the air preheater, and hot air obtained after heat exchange is guided out from the upper portion of the air preheater and enters a hearth. The smoke waste heat recovery system and method for the biomass circulating fluidized bed boiler have the beneficial effects that the problems of collision and ash blockage of the air preheater and the economizers are solved while the exhaust smoke temperature and the exhaust smoke loss are not increased, the service life of the air preheater on the tail is prolonged, the continuous operating capacity of the biomass boiler is improved, heat pollution is reduced, and the environment is protected.

Description

technical field [0001] The invention relates to the technical field of waste heat utilization of biomass circulating fluidized bed boiler flue gas, in particular to a biomass circulating fluidized bed boiler flue gas waste heat recovery system and method. Background technique [0002] As we all know, biomass has become one of the most potential new energy fuels for power plants due to its rich raw materials, clean environmental protection and substitution advantages. Due to the low calorific value of biomass fuel, short combustion time, and high moisture content, the content of water vapor and fly ash in the flue gas is high, which leads to the air preheater working in the low temperature flue gas area at the tail of the biomass boiler and the coal saving The working condition of the device is relatively harsh, and it is prone to low-temperature corrosion and dust blocking. Once low-temperature corrosion and ash blockage occur, the flue gas channel will be blocked, the resi...

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Problems solved by technology

[0004] Aiming at the corrosion and ash blocking problems of the tail air preheater and economizer of the biomass fluidized bed boiler, the present invention proposes a biomass circulating fluidized bed boiler flue gas waste heat recovery system and method. While improving the flue gas temperature and increasing the loss of exhaust gas, it solves the problems of corrosion and ash blocking of the air preheater and economizer, prolongs the service life of the tail air preheater, improves the continuous operation ability of the biomass boiler, reduces thermal pollution, and protects the environment

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