Biomass boiler with flue gas recirculation function

Abstract

The invention is applicable to the field of boilers, and provides a biomass boiler with a flue gas recirculation function, the biomass boiler comprises a material cavity, a hearth for heating the material cavity, an air inlet assembly, a separator, a flow control assembly and the like. An air inlet fan is used for filling air into a first hearth through the air inlet assembly and feeding flue gas around the air inlet assembly into biomass fuel for secondary combustion, so that the flue gas is subjected to secondary circulating combustion; the flue gas subjected to combustion enters a second hearth from the first hearth through a flue gas passage, so that the flue gas is combusted for the third time, and the flow control assembly controls the amount of air entering the second hearth along with the change of the flue gas amount. The distribution range of a high-temperature area is narrowed, the mixing proportion of fuel and air is optimized, the temperature in the hearth is reduced, and the purpose of reducing the content of nitric oxide is further achieved.

Description

technical field [0001] The invention belongs to the field of boilers, in particular to a biomass boiler with flue gas recirculation. Background technique [0002] As thermal energy equipment, boilers have been widely used in various industries. Biomass boiler is a type of boiler, which uses biomass energy as fuel. It is divided into biomass steam boiler, biomass hot water boiler, biomass hot air stove, biomass heat conduction oil furnace, vertical biomass boiler, Horizontal biomass boiler, etc. [0003] With the transformation of the national energy structure and industrial upgrading, low nitrogen emissions from gas-fired boilers have become a new requirement in the new era. One of the methods to control the emission of nitrogen oxides is to control the generation of nitrogen oxides from the combustion stage. By reducing the temperature of the high-temperature combustion zone, narrowing the distribution range of the high-temperature zone, rationally optimizing the mixture ...

AI Technical Summary

Problems solved by technology

[0004] The flue gas produced by combustion in the traditional boiler furnace is directly discharged after being filtered, but excess combustible components will be precipitated during the combustion process of the biomass fuel. If it is directly discharged, it will cause waste of fuel and result in a low utilization rate of the biomass fuel. However, if the amount of air charged into the furnace is increased, the temperature in the furnace will increase, and the amount of nitrogen oxides generated by the combustion of nitrogen will increase, causing more air pollution

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