A zero discharge treatment system using residual heat from low-temperature flue gas to evaporate desulfurization wastewater was put into operation in Ezhou Power Plant in Hubei province in July 2019.To optimize the operating parameters of this system

a balance test was carried out during the adjustment test at the initial stage of operation. The calculation methods and results of water balance

salt balance and heat balance of the system were introduced. The test results show that

under stable operating conditions

the system's ability to treat desulfurized wastewater reaches 16.19 m~3/h

the system's flue gas heat release and slurry heat absorption basically reaches equilibrium

and the sludge discharge ratio is controlled at 0.165(mass ratio of sludge to wastewater) to maintain the system salt balance.