College of Low Carbon Energy and Power Engineering, China University of Mining and Technology;College of Energy Environment and Safety Engineering, China Jiliang University;
[Objective] Circulating fluidized bed(CFB) boilers can achieve desulfurization during combustion by addingcalcium-based desulfurizer to the furnace, and the original emission concentration of SO_2 at the furnace outlet is low.However, in the face of increasingly stringent emission standards for air pollutants in thermal power plants, how tooptimize the furnace desulfurization process and consolidate the advantages of low-cost pollutant emission control ofCFB boilers is a very concerned issue in engineering. It is necessary to carry out a more in-depth understanding of theSO_2 generation and furnace desulfurization characteristics of CFB boilers. [Methods] This paper summarizes theinfluence of various design or operation parameters on the desulfurization efficiency in the furnace by combing therelevant research on the desulfurization in the furnace of CFB boiler in recent years, and puts forward the correspondingcontrol measures for the desulfurization in the furnace. [Results] The research shows that under the given desulfurizerand boiler load, improving the efficiency of the separator and the performance of the material circulation system, usingultra-fine limestone matching with the high-efficiency separator, reasonably designing and regulating the furnacetemperature(800~850 ℃) and oxygen content, determining the appropriate limestone feeding position, andappropriately increasing the calcium-sulfur ratio but not higher than 3.3, can effectively improve the desulfurizationefficiency in the furnace. Even under specific working conditions, it can directly meet the SO_2 ultra-low emissionstandards without relying on the tail flue gas desulfurization system. However, in-furnace desulfurization usually leads toan increase in NO_x emissions. When the calcium-sulfur ratio exceeds 2, the increase in boiler heat loss reduces theboiler efficiency. In addition, the increase in CaO and desulfurization products in fly ash also has a certain impact on thetail dust removal performance. [Conclusion] It is necessary to optimize the desulfurization performance of CFB boiler,and pay attention to the overall operation economy of the boiler..
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Basic Information:
DOI：10.19944/j.eptep.1674-8069.2025.02.002
China Classification Code:X701
Citation Information:
[1]韩铠泽,刘方,张光学.循环流化床锅炉炉内脱硫技术研究进展[J].电力科技与环保,2025,41(02):183-193.DOI:10.19944/j.eptep.1674-8069.2025.02.002.
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国家自然科学基金项目(52306029)