The invention relates to a
liquid slag tapping
biomass combustion device and a method, which belongs to the
combustion technical field of the
biomass. The device comprises a
biomass combustion furnace, a surplus heat boiler and a
flue on the
tail part of the surplus heat boiler. A secondary draught port is horizontally and obliquely arranged on the upper part of a combustion part of the
biomass combustion furnace, a
smoke outlet on the bottom part of the
combustion chamber is provided with a row of screen pipes, and the top part of each screen
pipe is provided with
slag trapping eaves to effectively screen the
slag. The method comprises the following steps that: air is sent into the
combustion chamber through the secondary draught port in a
cyclone way after being preheated to 150 to 400 DEG C, the temperature of the
combustion chamber is rapidly increased to 1300 DEG C, biomass
slag is molten, so the slag tapping is realized, heat exchange is adequately conducted between
smoke and an inner heated surface of a surplus heat boiler
hearth, the temperature of the
smoke is decreased to 500 DEG C to enter the
tail flue, and the exhausted smoke is pumped by a draught fan after the temperature is decreased to 120 to 150 DEG C. The device has a simple and reasonable structure, the
biomass combustion slag tapping can be adequately realized through the method, the smoke is clean, and the problems such as dust accumulation, coking,
corrosion and the like inside the boiler caused by the
low melting point of the biomass dust can be solved.