Process of using air-cooled island exhaust steam waste heat for zero-discharge treatment of thermal power plant wastewater

Abstract

A process for using the waste heat of air-cooled island exhaust steam for zero-discharge treatment of waste water in thermal power plants. Part of the exhaust steam entering the air-cooled island is introduced into the shell side of the exhaust steam condenser. After condensation, the exhaust steam condensate is reused and circulated for cooling After the water is heated by the exhaust steam condenser, it enters the shell side of the water-water heat exchanger as a heating heat source. After heat exchange and cooling, it is sent to the tube side of the exhaust steam condenser through the fresh water circulation pump to absorb heat energy, and after removing the solid suspension The waste water of the waste water first enters the waste water tank, and then enters the water-water heat exchanger through the waste water circulating pump. After absorbing heat, it passes through the ball collecting net and then divides into two routes. On the side of the heater tube, the other way enters the wastewater cooling tower water distribution system for spray evaporation, and the evaporated concentrated wastewater falls into the wastewater pool, and then is sent to the flue section in front of the electrostatic precipitator by an atomizing pump for spray evaporation, and the dried Particles enter the electric dust collector together with the flue gas, and are captured together with the dust. The invention is suitable for the treatment of waste water in thermal power plants.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a process for using waste steam waste heat of an air-cooled island for zero-discharge treatment of waste water in a thermal power plant. Background technique [0002] Power plant air cooling technology is a water-saving thermal power generation technology. The air cooling system can reduce the total water consumption of the power plant by more than 70% compared with the wet cooling system. However, the exhaust steam of the steam turbine of the air-cooled unit is led out by a large-diameter pipe, and the air is used as the direct cooling medium, and the surface heat exchange, condensation, and exhaust steam are carried out through the steel radiator, which requires a large cooling area, so the vacuum system is huge. The fan of the air-cooling unit consumes a lot of energy. According to foreign data, the self-consumption of the direct air-cooling system a...

AI Technical Summary

Problems solved by technology

The treatment process uses membrane concentration, which consumes a lot of energy and costs

[0007] To sum up, there is currently no one with reasonable structure design, low operating cost, high operating stability, which can effectively remove high salinity (salt content 15000mg / L ~ 110000mg / L), heavy metal ions and suspended solids in wastewater Desulfurization wastewater treatment device with equal pollution factors

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