Chemical regeneration chlorine reduction-based high-salinity wastewater reuse reduction and zero emission system

Abstract

The invention discloses a chemical regeneration chlorine reduction-based high-salinity wastewater reuse reduction and zero emission system. An outlet of a boiler make-up water ion exchange regeneration system and an outlet of a fine treatment ion exchange regeneration system communicate with an inlet of a regenerated wastewater neutralization system; an outlet of the regenerated wastewater neutralization system communicates with an inlet of a wet slag removal system through a pretreatment system; an outlet of a #1 sulfuric acid dosing system and an outlet of a #1 sodium hydroxide dosing system communicate with a dosing port of the boiler make-up water ion exchange regeneration system; an outlet of a #2 sulfuric acid dosing system and an outlet of the #2 sodium hydroxide dosing system communicate with a dosing port of the fine treatment ion exchange regeneration system; and a dosing port of the regenerated wastewater neutralization system is connected with a #3 sulfuric acid dosing system and a #3 sodium hydroxide dosing system. According to the chemical regeneration chlorine reduction-based high-salinity wastewater reuse reduction and zero emission system, chloride ions brought by chemicals can be eliminated, and low-cost zero discharge of high-salinity wastewater is realized by reducing chlorine sources of a whole plant, reducing the water quantity of the high-salinity wastewater and completely consuming the high-salinity wastewater by a wet slag removal system.

Description

technical field [0001] The invention belongs to the field of energy conservation and environmental protection, and relates to a high-salt waste water reuse reduction and zero-emission system based on chemical regeneration and chlorine reduction. Background technique [0002] Once-through cooling thermal power plants are generally located along the Yangtze River, and the water quality is good. The desalination of boiler feed water generally adopts "reverse osmosis-positive bed-yin bed-mixed bed" or "yang bed-yin bed-mixed bed". The sources of high-salt wastewater in once-through cooling thermal power plants include desulfurization wastewater and recycled wastewater. For power plants that use the traditional "positive bed-yin bed-mixed bed" for desalination of boiler feed water, the proportion of recycled wastewater to the high-salt wastewater of the entire plant is as high as nearly 40%. . [0003] At present, once-through cooling power plants usually feed recycled wastewate...

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Problems solved by technology

[0003] At present, once-through cooling power plants usually feed recycled wastewater and other industrial wastewater into the desulfurization system. The high-salt wastewater outlet of the whole plant only has a desulfurization system. Gas evaporation”, investment and operation costs are high, evaporation crystallization has the problem of crystalline salt disposal, flue gas solidification has an impact on the main flue and flue gas treatment efficiency, and solidified product treatment has certain environmental risks

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