Method and device for realizing double salt separation by using double MVR evaporation in coal chemical wastewater treatment

The dual MVR evaporation technology is used to achieve efficient separation of sodium sulfate and sodium chloride in coal chemical wastewater treatment, solving the problems of high energy consumption and large equipment investment in traditional evaporation technology, reducing operating costs, improving treatment efficiency and product recovery rate, and is suitable for industrial application.

CN116553758BActive Publication Date: 2025-10-03肖正群
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Patent Information

Application Number
CN202310436969.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-21
Publication Date
2025-10-03
Estimated Expiration
2043-04-21

AI Technical Summary

Technical Problem

Traditional evaporation technology in coal chemical wastewater treatment has the disadvantages of high steam consumption, large equipment investment, and difficult operation. In addition, the impurity salts cannot be effectively utilized, resulting in high production costs. The thermal denitrification process route is long and difficult to operate and control. The cold denitrification equipment investment and power consumption are also high, and the amount of salt burned in COD removal is too large.

Method used

The dual MVR evaporation technology is used to crystallize sodium sulfate and sodium chloride through high-temperature and low-temperature MVR evaporation respectively. Combined with the COD treatment system, dual salt separation is achieved, including high-temperature MVR evaporation crystallization, low-temperature MVR evaporation crystallization, and COD treatment, optimizing operating parameters and equipment configuration to reduce energy consumption and costs.

Benefits of technology

It achieves low energy consumption and high efficiency of double salt separation, with high product recovery rate, good purity, low overall cost, suitable for industrial promotion, good system COD balance, and the product can be used for subsequent deep processing. The device has a simple structure, simple operation and mature technology.

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Abstract

The present invention discloses a method for achieving dual salt separation in coal chemical wastewater treatment using double MVR evaporation. After the coal chemical wastewater is treated, it is subjected to double MVR evaporation to achieve thermal denitrification, and anhydrous sodium sulfate product and solid waste sodium chloride salt are obtained for deep processing in subsequent devices; during centrifugal separation, the filter cake is washed with water to reduce the COD content in the sodium sulfate and sodium chloride filter cakes, so as to maximize the overall COD removal rate; in order to maintain the COD balance of the system, the clear liquid from the partial hydrocyclone separation of the sodium chloride MVR is treated through processes such as concentration, drying, and incineration, and the miscellaneous salts after incineration are then re-entered into the system for treatment. The method as a whole has low energy consumption, low cost, high processing efficiency, energy conservation and environmental protection, and high product recovery rate and purity. The device thereof is also disclosed, including a sodium sulfate MVR system, a sodium chloride MVR system, and a COD treatment system connected in sequence. The process flow is short, the technology is advanced, the energy consumption is low, and the operation is simple.
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