Circulating fluidized bed boilers designed for burning biomass fuels such as straw, wood pellets, rice and molded biomass fuel are called biomass combustion circulating fluidized bed boilers, which can be used in power plants or heating. Below are some special designs for biomass combustion CFB boilers to help you understand the product.

Special design of biomass circulating fluidized bed boiler

Furnace and secondary air: considering the low density of biomass fuel, low heat valve, high volatile content, high moisture content, biomass boilers and coal-fired boilers have some obvious differences. Therefore, the biomass boiler must have a large combustion space and enough height to ensure that the fuel has enough time to burn in the furnace, and the deployment of sufficient stratified secondary air, with the concentrated combustion of volatiles, so as to ensure that the fuel and air are fully mixed combustion in the furnace.

Superheater: Since part of the Cl in the biomass fuel must be converted to HCl and Cl2, avoiding superheater deposits or ashes is an effective measure to reduce the degree of superheater corrosion, which is caused by the interaction of alkali metal salts, Cl2 and HCl. This series of boiler adopts plate superheater as high temperature superheater, which fundamentally avoids the sediment or ash in the superheater and eliminates one of the reasons that may lead to the corrosion of high temperature superheater.

Arrangement of rear heating surface and soot blower: strong agglutination valve for residue of sediment or ash after combustion of biomass fuel. On the one hand, the heating surface should be reasonably arranged in the design process to keep the temperature of flue gas at the inlet of the high temperature superheater at a lower level. On the other hand, the tubes of the high temperature superheater are made of heat-resistant materials, and the soot blower should be reasonably arranged to prevent the deposition or ash accumulation of the high temperature superheater.