A zero-discharge system and method for desulfurization wastewater that is easy to clean

Abstract

The invention provides a zero-discharge system and method for desulfurization wastewater that is convenient for cleaning. The system of the present invention includes an evaporation tower, a flue gas delivery system, a waste water feeding system, a cleaning system and a control system. The waste water flow meter, waste water regulating valve and waste water switch valve are arranged on the feed pipe, and the cleaning system is connected with the waste water feeding pipe between the waste water regulating valve and the waste water switch valve through the clean water pipe, and the clean water regulating valve is set on the clean water pipe. Valve and cleaning water booster pump, the control system starts the cleaning system according to the wastewater flow signal monitored by the wastewater flowmeter and controls the cleaning water regulating valve and the cleaning water booster pump to adjust the flow and pressure of the cleaning water. The above system can realize zero discharge of desulfurization wastewater, and prevent valves, pipes and other components and equipment in the system from being blocked, providing a guarantee for the long-term stable operation of the system.

Description

technical field [0001] The invention relates to the technical field of desulfurization wastewater treatment, in particular to a zero-discharge system and method for desulfurization wastewater that are convenient for cleaning. Background technique [0002] During the production and operation of thermal power plants, a large amount of desulfurization wastewater will be generated. The salt content of this wastewater is as high as 3-7%, and the content of suspended solids is as high as 3-8%. The water quality is extremely complex, and direct discharge will cause serious pollution to the environment. In recent years, with the country's increasingly strict discharge control of industrial wastewater, the zero discharge of desulfurization wastewater from thermal power plants has become a hot spot in the industry. [0003] At present, the wastewater rotary atomization evaporation technology is one of the mainstream zero-discharge technologies for desulfurization wastewater in the ind...

AI Technical Summary

Problems solved by technology

The blockage of the valve will affect its normal opening and closing, and also affect the adjustment of the waste water flow; the blockage of the rotary atomizer will affect the atomization effect of the waste water, and then affect the evaporation effect of the waste water. Damage; clogging of waste water tanks reduces its ability to store and buffer waste water and exacerbates clogging of pipes connected to it

If valves, pipes, rotary atomizers or waste water tanks are seriously blocked, the desulfurization waste water evaporation system will have to stop running, usually about every 1-2 months (depending on the content of suspended matter in waste water), the system needs to be interrupted And check, dismantle, dredge, replace or install the blocked equipment, which is difficult, time-consuming and costly. During this period, the desulfurization wastewater cannot be treated normally, and its zero discharge cannot be achieved.

[0005] In addition, due to the Cl in the desulfurization wastewater - The content is very high (generally 15000-20000mg / L), so the relevant valves, pipes, rotary atomizers and other equipment in the system must be made of metal materials resistant to high-concentration chloride ion corrosion or adopt high-standard anti-corrosion measures, such as Titanium steel, Hastelloy, silicon carbide lining, etc., are extremely expensive

When these devices fail due to clogging with wastewater suspensions, their replacement costs are extremely high

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