Recovery of latent heat and condensate water from flue gas in a large coal-fired power plant using fluorine plastic heat exchanger was introduced.The flue gas temperature at outlet of the wet desulphurization system is about 50 ℃to 55 ℃

and the flue gas is saturated or supersaturated.The water vapor concentration in flue gas is about 12%to 15%.Water vapor in flue gas carries a large amount of latent heat

which reduces the boiler efficiency.If equipped with condensing heat exchanger at outlet of the flue desulphurization system

the deep condensation of high moisture flue gas can be realized

which can recycle water of great quantities and recover the latent heat at the same time.Thus

apilot test system was constructed in a coal power plant to extract the flue gas for field test.The experimental results show that

when the flue gas temperature was reduced by 10 ℃

the condensate of 92.25t/h and latent heat of 226.97GJ/h can be obtained

by translating the results to the whole flue gas volume(2 500 000 Nm3/h

standard state

the same as follows).This system can realize zero water consumption in wet desulphurization system

which has important significance in protection of water resources in arid regions.