Coal-fired power plant wastewater zero-discharge combined flue evaporation system and method thereof

Abstract

The invention discloses a coal-fired power plant wastewater zero-discharge combined flue evaporation system and a method thereof. For a unit using a pure bag-type dust collector, a smoke inlet of a bypass flue evaporator is communicated with a pipeline between an SCR reactor and an air preheater through a bypass smoke inlet flue; the smoke outlet is communicated with a pipeline between the air pre-heater and the pure bag-type dust remover through a bypass smoke outlet channel; the spray buffer tank is communicated with the wastewater tank through a first double-fluid atomizer; for a unit of the electric bag dust collector, the same ends of a plurality of atomizing branch pipes with atomizing nozzles are respectively communicated with an atomizing main pipe in parallel, the atomizing main pipe is communicated with a waste water tank through a second double-fluid atomizer, a main flue is communicated between an air preheater and the electric bag dust collector, and the atomizing nozzlesare positioned in the main flue at intervals; due to the adoption of a transformation scheme of concentration decrement and combined flue evaporation, zero discharge of wastewater in the whole plant is achieved, the hidden danger of environmental protection is thoroughly eliminated, the environmental benefit is obvious, the process technology is stable and reliable, and the transformation cost iseconomic and reasonable.

Description

technical field [0001] The invention relates to the field of wastewater treatment systems and methods for coal-fired power plants, in particular to a combined flue evaporation system and method for zero discharge of wastewater from coal-fired power plants, or a combined flue evaporation system for zero-discharge of wastewater from coal-fired power plants. Emission system and method thereof. Background technique [0002] At present, most coal-fired power plants in China generally do not have a zero-discharge wastewater treatment system for the entire plant. High-salt waste water is mainly composed of desulfurization waste water after standard treatment and a small amount of regenerated high-salt waste liquid. Due to the high salt content and chloride ion content in desulphurization waste water, it has been used in coal yards, coal transport trestles and transfer stations for a long time There is bound to be a greater environmental risk in spraying. [0003] Taking a coal-fi...

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Problems solved by technology

[0004] However, according to the relevant requirements of China's environmental protection department, high-salt wastewater from coal-fired power plants cannot be discharged outside; Spraying at trestle bridges and transfer stations will inevitably have a greater environmental risk, and a large amount of chloride ions will still flow to the boiler system, which will also adversely affect the boiler

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