Desulfurization wastewater chloride ion extraction and sodium sulfate and ammonium chloride production system

Abstract

The invention discloses a desulfurization wastewater chloride ion extraction and sodium sulfate and ammonium chloride production system. The system comprises a desulfurizing tower, a wastewater regulating tank, a reaction sedimentation tank, a tubular microfiltration device, a regulating water tank and a chloride ion extractor which are connected in sequence. The downstream of the chloride ion extractor is communicated with a buffer tank and a first extractant buffer tank; a sodium sulfate solution generated by the chloride ion extractor sequentially passes through the buffer tank, a cooling crystallizer and a solid-liquid separator, and a chlorine-rich extraction agent sequentially passes through the first extraction agent buffer tank and a chloride ion reverse extraction machine and reacts with concentrated ammonia water in the chloride ion reverse extraction machine to generate an ammonium chloride solution and a regenerated extraction agent. The ammonium chloride solution passes through an evaporation crystallizer, and the regenerated extraction agent flows back to the chloride ion extractor through a second extraction agent buffer tank. Through the arrangement, the system achieves closed circulation, and the zero emission of desulfurization wastewater can be achieved; chlorine ions are extracted and separated, and the investment and operation cost are greatly reduced compared with membrane separation and evaporation separation.

Description

technical field [0001] The invention relates to the technical field of desulfurization wastewater treatment systems, in particular to a chloride ion extraction and sodium sulfate and ammonium chloride output system from desulfurization wastewater. Background technique [0002] The existing desulfurization wastewater can be treated in the following ways: 1. Directly discharge after the coagulation treatment of the three-unit dosing reaction or first pass through the three-unit dosing reaction coagulation treatment and then be clarified by the clarifier before discharge; 2. First pass through the three-unit tank After the coagulation treatment of the dosing reaction, it is concentrated through the membrane, and then evaporated through MVR or multi-effect concentration to separate or remove miscellaneous salts; Flue evaporation technology treatment. [0003] However, the above three methods are outdated technologies, which can no longer meet the latest desulfurization wastewat...

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Problems solved by technology

[0003] However, the above three methods are outdated technologies, which can no longer meet the latest desulfurization wastewater discharge standards; the processes are complicated, the system investment is large, the energy consumption is high, and the miscellaneous salt produced is solid waste, which still needs further treatment; at the same time, the extraction of high-temperature flue gas affects the boiler Coal consumption during operation, nozzle atomization failure, carrying water droplets are easy to corrode the flue and downstream systems

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