Method and system for zero release treatment of limestone-gypsum desulfurization wastewater

Abstract

The invention relates to a method and a system for zero release treatment of limestone-gypsum desulfurization wastewater. The method comprises steps as follows: 1) modified fly ash is added to a filtrate tank, and slurry in the filtrate tank is conveyed to an absorbing tower; 2) slurry output after desulfurization in the absorbing tower is conveyed to a hydrocyclone station, slurry with larger particle size flows to a base flow outlet and then flows to a vacuum belt machine, and slurry with smaller particle size flows to an overflow outlet and flows to the vacuum belt machine; 3) the slurry issubjected to vacuum suction filtration through the vacuum belt machine, modified fly ash and salt crystalize and stay on gypsum and are transported out together with gypsum, and slurry subjected to vacuum suction filtration flows out; 4) the slurry subjected to vacuum suction filtration flows into the filtrate tank after being filtered. Compared with the prior art, the method and the system havethe advantages that desulfurization wastewater can be very conveniently subjected to zero release treatment, a process is simple, zero release of the desulfurization wastewater can be really realized,and the method and the system have popularization value.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a zero-discharge treatment method and system for limestone gypsum desulfurization wastewater. Background technique [0002] my country is a country that uses coal as the main energy source, and coal-fired power generation is one of the most important ways of coal utilization in my country. According to my country's national conditions, coal-fired power generation will still dominate in the 21st century. Among the many air pollutants emitted by coal-fired thermal power units, SO 2 And the dust is more harmful to the environment and is the main pollutant to be controlled. With the progress of society and the development of economy, the pollution of thermal power plants to the atmospheric environment has been widely concerned by people. Therefore, it is a severe challenge for the sustainable development of my country's energy field to effectively reduce pollutant emi...

AI Technical Summary

Problems solved by technology

During the operation of the wet flue gas desulfurization system, ions in the slurry of the absorption tower continue to accumulate, such as Cl - , F - , mercury, lead, nickel, arsenic and chromium heavy metal ions, etc. When these ions reach a certain concentration, they will accelerate the corrosion of desulfurization equipment and bring serious harm to the stability of the desulfurization system, and the direct discharge of desulfurization wastewater is harmful to the ecological environment Very large, the common chemical precipitation treatment method is complicated, and needs to add chemicals continuously, and the operation cost is high

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