The invention discloses an air preheating
biomass boiler, belongs to the technical field of boilers, and aims to solve the problems of low
combustion efficiency, insufficient
flue gas
waste heat utilization and particulate matter emission of a traditional
biomass boiler.
Function optimization is achieved through a main body structure composed of a furnace body, a charging
barrel and a rotating
pipe, a double-spiral-disc heat exchange
assembly is arranged in the charging
barrel,
biomass fuel is preheated through boiler exhaust
smoke waste heat, meanwhile,
smoke is discharged through exhaust holes after being distributed through spiral disc gas storage cavities, and unburned particles are filtered by a biomass layer and carried to a
hearth to be subjected to secondary
combustion; an air inlet cavity is formed in the rotating
pipe, and air is preheated through the fixed
pipe and the first connecting pipe and then input into the
hearth. The exhaust
assembly adopts a sliding rod and sealing block matched structure, and a convex block mechanism driven by a rotating pipe drives the sealing block to periodically move, so that gas in the charging
barrel is intermittently exhausted through a double-layer filter screen. According to the boiler, the heat efficiency is improved through a
smoke-air two-way preheating and particulate matter secondary
combustion mechanism, and the biomass preheating,
air heating and emission treatment process is optimized.