A coal-fired thermal power plant flue gas pollutant zero discharge and waste recovery system

Abstract

The invention discloses a system for realizing coal-fired thermal power plant flue gas pollutant zero emission and waste recovery. The system comprises a coal-fired boiler, a denitrification device, an air pre-heater, an air blower, a dust collector, a desulfurization tower, a white smoke removing unit, a liquid storage tank, a circulating solution pump, a heat exchanger device, a spray pipe, a white smoke regenerating device and a condensate pump, wherein the denitrification device is communicated with the flue gas outlet of the coal-fired boiler in order to remove nitrogen oxide in flue gas;the air blower is used for blowing air into the coal-fired boiler through the air pre-heater; both the air blower and the denitrification device are communicated with the air pre-heater; heat is exchanged in the air pre-heater between the air blown into by the air blower and flue gas discharged by the denitrification device in order to heat the air blown into the coal-fired boiler and cool the flue gas discharged by the denitrification device. The system provided by the invention has the beneficial effects of optimizing the pollutant treatment process, lowering thermal energy consumption, effectively realizing desulfurization, denitrification, dechlorination, mercury removal and white smoke removal, and achieving the zero emission effect of no white smoke.

Description

technical field [0001] The invention relates to a system for zero discharge of flue gas pollutants in a coal-fired thermal power plant and a waste recovery system. Background technique [0002] The flue gas emitted by coal-fired boilers contains a large amount of sulfide, nitrogen oxides, solid dust, water vapor, and a small amount of chlorine and mercury. The discharge of pollutants will have a serious impact on the atmosphere. Desulfurization and denitrification are problems that coal-fired boilers must face and solve. [0003] In the prior art, a denitrification device, a dust collector, and a desulfurization tower are generally installed at the outlet of the boiler to remove nitrogen oxides, sulfides, and dust from the boiler flue gas. The final exhaust flue gas contains a large amount of water vapor, which produces white smoke visual pollution at the chimney outlet. At the same time, the desulfurization tower needs to replenish water. Generally, industrial tap water i...

AI Technical Summary

Problems solved by technology

The final exhaust flue gas contains a large amount of water vapor, which produces white smoke visual pollution at the chimney outlet. At the same time, the desulfurization tower needs to replenish water. Generally, industrial tap water is used, which contains a large amount of chloride ions. After entering the desulfurization system, it will seriously corrode the equipment. The form is discharged together with the flue gas, polluting the environment and endangering health

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