Flue gas waste heat recovery system of biomass boiler

Abstract

The invention discloses a flue gas waste heat recovery system of a biomass boiler, and belongs to the technical field of energy recycling. The system comprises an economizer communicating with a flue gas pipeline, a smoke cooler communicating with the economizer, an air preheater communicating with an air pipeline, and a high-pressure water supply pipeline from a deaerator. According to the system, the smoke cooler is additionally arranged between the economizer and the air preheater, and air is preheated by high-pressure feed water from the deaerator other than flue gas; the feed water for heating the air preheater is directly led out from the high-pressure water supply pipeline to preheat the air entering the air preheater, and used for preheating the air entering the air preheater; then, the feed water enters the smoke cooler to absorb the flue gas heat; and finally, the feed water returns to the high-pressure water supply pipeline, enters the economizer and finally enters a steam pocket. According to the flue gas waste heat recovery system, the air preheater can be prevented from being corroded, safe operation of the air preheater is guaranteed, and meanwhile the problem of corrosion of the heating surface at the tail of the boiler can be further solved.

Description

technical field [0001] The invention relates to the technical field of energy recovery and utilization, in particular to a biomass boiler flue gas waste heat recovery system, which is used for thermal power generation biomass boiler flue gas waste heat recovery. Background technique [0002] In the process of thermal power generation, in the existing biomass combustion boilers, steam is generated by fully burning biomass combustion particles. During the combustion process, a large amount of high-temperature flue gas released will be discharged naturally, which not only pollutes the environment, but also It causes waste and cannot meet the requirements for boiler energy saving; at present, the waste heat utilization system of flue gas at the tail of conventional biomass boilers is as follows: figure 2 As shown, the flue gas enters the economizer to heat the feed water, and after cooling down, enters the air preheater to heat the cold air. [0003] Due to the chlorine element...

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Problems solved by technology

[0002] In the process of thermal power generation, in the existing biomass combustion boilers, steam is generated by fully burning biomass combustion particles. During the combustion process, a large amount of high-temperature flue gas released will be discharged naturally, which not only pollutes the environment, but also It causes waste and cannot meet the requirements for boiler energy saving; at present, the waste heat utilization system of flue gas at the tail of conventional biomass boilers is as follows: figure 2 As shown, the flue gas enters the economizer to heat the feed water, and after cooling down, enters the air preheater to heat the cold air

[0003] Due to the chlorine element contained in the biomass, the flue gas is highly corrosive, such as figure 2 In the conventional flue gas waste heat recovery system shown, the temperature of the cold air entering the air preheater is between -10°C and 30°C. If the temperature is too low, it will easily cause condensation of the flue gas, which will further cause corrosion at the cold end of the air preheater and affect the safe operation of the equipment.

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