Biomass combustion system for ceramic roller kiln and biomass combustion method

A biomass combustion system for a ceramic roller kiln, comprising:

• a roller kiln;
• a biomass gasifier;
• a pentane gasification device;
• and
• a fuel manifold;
• wherein the biomass gasifier is provided with a feed port, a first gas inlet, a second gas inlet and an gas outlet;
• the feed port is configured for feeding of biomass or biomass waste;
• and the gas outlet is connected to the fuel manifold through a heat exchanger;
• the pentane gasification device is connected to the fuel manifold;
• the roller kiln is provided with a preheating section, a combustion section and a cooling section;
• the fuel manifold is communicated with the combustion section through a first pipe, and the first pipe is provided with a premixer;
• the cooling section is connected to the premixer through a second pipe;
• a first part of hot air discharged from the cooling section is transported to the premixer, and a second part of the hot air discharged from the cooling section is transported to the second gas inlet;
• the hot air discharged from the cooling section has a temperature higher than ambient temperature;
• the premixer is configured to mix the first part of the hot air discharged from the cooling section with a mixture of biomass gas and gaseous pentane transported by the fuel manifold to obtain an air-fuel mixture, and feed the air-fuel mixture to the combustion section through a plurality of burners;
• a first part of flue gas discharged from the preheating section is configured to provide heat source for the heat exchanger;
• a second part of the flue gas is configured to gasify liquid pentane in the pentane gasification device;
• and a third part of the flue gas is transported to the first gas inlet.