Technology and device for zero-drainage of desulfurization wastewater

Abstract

The invention discloses a technology and a device for zero-drainage of desulfurization wastewater. The technology comprises the following steps of (1) sending the desulfurization wastewater and alkaline liquid to the top part of a deamination tower, sending an aeration fan into the deamination tower via the bottom part, and enabling the aeration fan to be in reverse contact with the desulfurization wastewater; (2) sending the ammonia-containing air after blowing into a deamination reactor, performing deamination, and sending into a deduster; sequentially sending the wastewater after deamination into an ultrafiltration device and a reverse osmosis device, recycling the fresh water of the reverse osmosis device, and sending the concentrated water into a spray-drying tower; leading the dedusted flue gas by the deduster into the spray-drying tower to exchange heat, enabling the dried crystal particles to fall into an ash hopper, and sending the flue gas after heat exchange into the deamination reactor. The technology has the advantages that the wet type desulfurization wastewater is performed with ammonia-nitrogen removal and recycling, wastewater concentration, spray-drying, evaporating and crystallizing, so as to complete the zero-drainage of the desulfurization wastewater; while the running reliability of the treatment device is improved, the recycling rate of the wastewater isimproved and the cycling utilization of the ammonia-nitrogen is realized, the investment running cost of the device for the zero-drainage of desulfurization wastewater is greatly reduced.

Description

technical field [0001] The invention relates to the field of resources and environmental protection, in particular to a low-cost zero-discharge technology for desulfurization wastewater. Background technique [0002] As a major player in water and drainage, thermal power accounts for 20% of the total industry. From the perspective of economic operation and environmental protection, it is of great significance to save water for power generation, improve the reuse rate of circulating water, and realize "zero discharge" of wastewater from thermal power plants. Traditional power plant wastewater treatment can easily implement cascade applications at various levels. Each wastewater can be solved through traditional and mature processes, but the most complicated and difficult wastewater to treat is desulfurization wastewater. Due to its particularity, complexity and strong corrosiveness , and its treatment has become a key factor restricting the zero discharge of wastewater from t...

AI Technical Summary

Problems solved by technology

The high concentration of ammonia nitrogen seriously affects the normal operation of the reverse osmosis membrane, increasing the investment and operating costs of the reverse osmosis device

At the same time, in the MVR evaporation crystallization process, the investment and operation costs of the MVR device are high, and the evaporation crystallization device is prone to fouling and corrosion

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