"The drying out using residual heat of blow-off water from hot furnace" or the boiler shut-down conservation method using "filming amine"

all can't effectively control corrosion during the time of boiler shut-down

for this

a boiler shutdown conservation method using "ammonia spirit/hydrazine passivation drying out + vacuum drying" has been put forward.Results of practical application show that the water quality in same time section of using this conservation method is superior to that of the origenal method

during the first hour of cold-state flushing

the iron content at the time of starting separator is 125 μg/L and 310 μg/L respectively

the flushing time has reduced 50% from that of the origenal method

a large amount of desalted water and fuel has been saved.In addition

a partial header of the boiler had been detected before start-up of the unit

the water accumulation and secondary floating corrosive matters haven't been discovered

boasting remarkable effectiveness of corrosion prevention.