Principle and method process of low-temperature circulating water condensation whitening technology

After the flue gas enters the spray condensing tower, it directly contacts with the low-temperature intermediate water in it to reduce the temperature to below the dew point. The cooled flue gas returns to the chimney for direct discharge, and the heated spray water enters the water storage tank inside the tower. After multi-layer sedimentation, the settled clean water overflows to the water storage tank outside the tower. Under the action of the circulating pump, it enters the heat pump refrigeration unit for cooling treatment, and then returns to the condensing tower through the main circulating pump for cooling spray, completing a complete cycle.
The water vapor in the flue gas continuously condenses with the flue gas temperature decreasing. The condensed water actually comes from the water evaporated from the spray slurry of the desulfurization tower. This part of condensed water enters the make-up water system of the desulfurization tower after sedimentation in the reservoir, and returns to the desulfurization tower as make-up water, which can effectively relieve the make-up water pressure caused by the wet desulfurization process.
In the spray condensation tower, because the flue gas and the low-temperature spray water are in direct contact with each other to cool down, the dust concentration in the flue gas can also be effectively reduced and the pollutant emission in the final smoke can be reduced through the washing effect of the spray water on the flue gas.
The above condensation cooling technology can reduce the temperature of wet flue gas from 50 ℃~60 ℃ at the outlet of the desulfurization tower to below 30 ℃, and recover the condensate water in the flue gas as make-up water for the desulfurization tower to reduce the water loss of wet desulfurization; In addition, the flue gas is washed again and the dust content in the flue gas is significantly reduced, so as to achieve the multiple purposes of energy saving, water saving and emission reduction at the same time.