Taking the CFB boiler in a biomass power generation plant as an example

the type selection of the primary secondary air fans and induced draft fans for biomass power generation system was investigated.Moreover

the economic benefit difference between constant-speed fans and variable-frequency fans and the influence of fuel moisture as received on the operation of fans were analyzed.The results showed that

all the three main fans should adopt centrifugal fans

among which the primary air fan should be driven by constant-speed motor

and the secondary air fan and induced draft fan should be driven by variable-frequency motor.Each boiler in biomass power generation system should be equipped with one primary and secondary air fans

and the flow allowance of them should be larger than 15%

and the outlet pressure allowance be larger than 20%.One induced draft fan should be equipped for each boiler below 65t/h capacity level

and two for boiler above 130 t/h level

the flow allowance should be larger than 20% and the outlet pressure allowance be larger than 25%.Design of induced draft fans should consider the influence of fuel moisture as received.