Steam wet-type self-condensation device and method for desulfurization wastewater zero-discharge system

Abstract

The invention discloses a steam wet-type self-condensation device and method for a desulfurization wastewater zero-discharge system. According to the invention, negative-pressure tail steam from multi-effect flash separation equipment enters a tube pass of a wet air cooler for cooling, and the wet air cooler cools a heat exchange tube through self-circulating spray water and condensed water discharged by a condensed water pump; mechanical forced ventilation is adopted for heat exchange, and condensed water is discharged from an outlet of the wet-type air cooler and flows downwards into a condensed water tank; when the condensed water collected in the condensed water tank reaches a certain liquid level, the condensed water can be discharged as supplementary water by the condensed water discharge pump to the wet air cooler for heat exchange, and part of the condensed water can also be discharged to each water consumption point; a vacuum pump exhausts air and incompletely condensed watervapor in the condensation water tank, and a negative pressure working condition in the condensation water tank is maintained, so the negative pressure working condition is provided for the wet type air cooler and a multi-effect flash evaporation separation system. The device and method of the invention has the advantages that circulating cooling water does not need to be introduced from the outside, and low-energy-consumption stable operation can be achieved at different environment temperatures.

Description

technical field [0001] The invention relates to the technical field of desulfurization wastewater treatment, in particular to a steam wet self-condensing device and method for a zero discharge system of desulfurization wastewater. Background technique [0002] In the flue gas desulfurization process of thermal power plants, limestone-gypsum wet desulfurization systems are usually used. In order to maintain the balance of chloride ions in the desulfurization system, desulfurization wastewater needs to be discharged from the desulfurization system regularly. Since this part of the wastewater contains a large amount of dissolved salts and other harmful pollutants, the multi-effect evaporation technology is currently used to recycle this part of the wastewater to achieve zero discharge of desulfurization wastewater. [0003] In the process of adopting multi-effect flash evaporation technology, the tail negative pressure steam generated in the last effect flash evaporation proces...

AI Technical Summary

Problems solved by technology

However, in most power plants, it is often impossible to provide this part of circulating water due to the difficulty of opening the pipeline or insufficient circulating water surplus, which makes it difficult to implement the multi-effect flash technology in the zero-discharge transformation project of desulfurization wastewater

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