Biomass Fuel Combustion Method Selection
Biomass Fuel refers to fuel like crop straw, wood chip, sawdust, peanut shell, corn cob, rice straw, rice husk, straw bran, tree branches and leaves, hay and compressed pellet. Biomass boiler features big heating surface, high thermal effciency, little fuel leakage, separate air chamber, sufficient burning, variable frequency control and PLC automatic control, etc. The selection of combustion method for biomass fuel shall be based on moisture, size, ash and slagging property.
Biomass fuel combustion selection
(1) When the moisture as received is less than 15%, size is less than 3mm, and ash is less than 3%, suspension combustion by wind spraying shall be adopted. If slagging R2≤1.5, a cast iron fixed grate is ok; if slagging R2> 1.5, a water-cooled fixed grate is ok.
(2) When the moisture as received is less than 15%, size is 5-50mm, and ash is 4-20%, layer or utilized combustion by mechanical feeding shall be adopted. The combustion equipment can be chain grate. If slagging R2> 2.0, the reciprocating grate is a must. If biomass boiler capacity is over 14MW and slagging R2＜1.5, bubbling fluidized bed or circulating fluidized bed is ok.
(3) When the moisture as received is 20-50%, size is less than 10mm, and ash is 1-5%, wind spraying plus layer combustion
shall be adopted. The combustion equipment can be cast iron fixed grate or chain grate. If boiler capacity is over 14MW, land slagging R2＜1.5, bubbling fluidized bed or circulating fluidized bed is ok.
(4) When the size is 50~150mm, slagging R2<1.5, chain grate or inclined water-cooled grate is ok; if slagging R2>1.5, reciprocating grate is ok.
(5) Biomass fuel-like straw shall be shredded into pieces of less than 50mm in size. If slagging R2<1.5, the chain grate is ok; if slagging R2>1.5, the reciprocating grate is a must. As one of the largest biomass boiler manufacturers in the world, Taishan Group has been designing, fabricating, and installing turn-key biomass boiler systems domestically and abroad since 2007.
