Biomass boiler oxygen-enriched combustion and biomass fly ash potassium extraction method

By mixing and reacting the high-concentration CO2 flue gas generated by oxygen-enriched combustion in a biomass boiler with biomass fly ash and water, the problem of complex and costly potassium extraction from biomass fly ash is solved, achieving efficient and low-cost potassium extraction and impurity removal, and achieving the effects of flue gas decarbonization and carbon fixation.

CN120922891APending Publication Date: 2025-11-11CHONGQING YUANDA FLUE GAS TREATMENT FRANCHISING
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Patent Information

Application Number
CN202511139704.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-14
Publication Date
2025-11-11

AI Technical Summary

Technical Problem

Existing biomass fly ash potassium extraction technology suffers from problems such as complex processes, high extraction costs, and low product purity.

Method used

The high-concentration CO2 flue gas generated by oxygen-enriched combustion in a biomass boiler is reacted with a mixture of biomass fly ash and water. The CO2 dissolves to generate soluble metal ions, which react with impurities to form precipitates. Combined with low-temperature flue gas heating and water vapor precipitation, potassium is efficiently extracted and impurities are removed.

Benefits of technology

It significantly reduced heat energy, water consumption, and reagent consumption, improved potassium extraction efficiency, realized the cascade utilization and resource utilization of heat energy, and achieved flue gas decarbonization and carbon fixation effects.

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Abstract

The invention relates to the technical field of environmental protection, and discloses a biomass boiler oxygen-enriched combustion and biomass fly ash potassium extraction method which comprises the following steps: step 1, high-carbon-dioxide-concentration flue gas generated after biomass is subjected to oxygen-enriched combustion in a boiler is cooled, fly ash is separated, the flue gas enters a flue gas heat exchanger, and low-temperature flue gas and hot air are obtained after heat exchange with cold air; 2, fly ash obtained through separation and water are mixed and stirred, a water-ash mixture is obtained, CO2 is introduced into the water-ash mixture, and the ash mixture and low-temperature flue gas are subjected to a contact reaction; step 3, performing solid-liquid separation on the water-ash mixture after the reaction to obtain a potassium-rich solution A and a filter residue A, dividing the solution A into a solution B and a solution C, returning the solution B to the contact reaction tank for circulation, and enabling the solution C to enter a concentration device; 4, heating and concentrating the solution C through hot air to obtain a solution D; and 5, carrying out solid-liquid separation on the solution D to obtain potassium salt and mother liquor F. The method is simple in process, low in extraction cost and high in product purity.
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