The present application belongs to the field of
coupling power generation, and provides a
system and a control method for
coupling a pulverized
coal boiler low-load stable
combustion and blending
combustion. The
system comprises two paths of
cold air from a boiler primary air fan, one of which is directly transmitted to a
cold air main
pipe, and the other is transmitted to a hot air main
pipe after being preheated by a preheater; a
coal mill respectively takes
cold air and hot air from the cold air main
pipe and the hot air main pipe, mixes them to a set temperature, and then enters the
coal mill for
drying of the pulverized coal and sending the dried pulverized coal to the furnace of the pulverized coal boiler for
combustion; a
biomass gasifier respectively takes cold air and hot air from the cold air main pipe and the hot air main pipe, mixes them to a set temperature, and then enters the
biomass gasifier;
biomass material is gasified in the
biomass gasifier to generate carbonized products of biomass
charcoal and
biogas; the carbonized product of biomass
charcoal is transported to the coal mill to be ground together with raw coal, and then is blown to the pulverized coal boiler for combustion in the furnace; and the
biogas is directly introduced into the pulverized coal boiler for combustion in the furnace.