The influence of cancelling bypass duct on such equipments as electrostatic precipitator

desulfurization booster fan

gas-gas heat exchanger(GGH) and desulfurization absorption tower was presented.Taking a 350 MW unit in Huanneng Nantong Power Plant as an example

through some relative experiments

the corresponding countermeasures that must be carried out after cancelling the bypass duct were determined.Such as

the desulfurization booster fans should be put into service and the baffle plate at inlet and outlet of the FGD system should receive the opening signal when the forced and induced draft fans started;after tripping of the induced and forced draft fans in one side

the booster fans should be intertripped

and the unit can be stabilized at 50% load to run under RB condition;if all the induced and draft fans tripped

intertrip the booster.If a fault occurred in the booster fan lubricating system

intertrip the booster fans and the boiler MFT.To overcome the resistance of the whole air and gas system

the booster fans were suggested to be cancelled

and the capacity-increasing transformation should be conducted on the two induced draft fans.