Device and method for treating flue gas generated in preparation of magnesium oxide by coupling internal circulation with fused salt heat storage

Through the internal circulation coupled flue gas treatment device for molten salt heat storage, the waste heat of the kiln flue gas in the magnesium oxide preparation process is converted into electrical energy through the molten salt heat exchange and power generation circulation system, solving the problem of the inability to recover the waste heat of the flue gas, and achieving efficient energy utilization and significant improvement in the environment.

CN119713879APending Publication Date: 2025-03-28NANJING CIGU TECH CORP LTD +1
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Patent Information

Application Number
CN202411977479.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-31
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

In the existing magnesium oxide preparation process, the flue gas generated by the kiln cannot effectively recover the remaining heat, resulting in energy waste and environmental pollution.

Method used

The flue gas treatment device that is coupled to molten salt heat storage is adopted, including the internal circulation system of raw material calcined flue gas, the flue gas heat transfer and heat storage circulation system, and the organic working fluid power generation circulation system. Through the molten salt heat transfer and power generation circulation system, the waste heat of the flue gas is converted into electrical energy.

Benefits of technology

It effectively reduces energy consumption and flue gas treatment costs, significantly reduces the emissions of NOx, SO2 and CO2, improves the corrosion resistance and operating life of the equipment, and realizes efficient recycling and utilization of flue gas waste heat.

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Abstract

The invention discloses an internal circulation coupled fused salt heat storage flue gas treatment device and method for magnesium oxide preparation, and the flue gas treatment device comprises a raw material calcination flue gas internal circulation system for carrying out desulfurization and denitrification treatment on flue gas, the flue gas heat exchange and storage circulating system is used for exchanging heat with flue gas to absorb waste heat; the organic working medium power generation circulating system is used for converting the absorbed flue gas waste heat into electric energy for utilization; according to the flue gas molten salt heat exchange device, the treated flue gas meeting the emission requirement flows back and is conveyed to the air inlet of the kiln, so that the energy consumption and the flue gas treatment cost are reduced, emission of NOX, SO2 and greenhouse gas CO2 is greatly reduced, and the corrosion resistance operation life of the flue gas molten salt heat exchange device is remarkably prolonged; molten salt heat exchange equipment is used for indirect heat exchange between flue gas and an organic working medium, stability of heat transmission is guaranteed, the flue gas waste heat recycling requirement in a small-capacity environment is met, and nearby conversion and consumption of energy are achieved.
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