新型660MW超超临界环形炉膛循环流化床锅炉技术研究

Study on New 660MW Ultra-supercritical CFB Boiler Technology With an Annular Furnace

为了解决循环流化床锅炉大型化与高参数化后带来的二次风穿透、受热面布置、多分离器优化布置等问题，提出了一种完全区别于传统矩形单炉膛与裤衩腿炉膛的环形炉膛结构，该炉型炉膛水冷壁的周界长度比常规矩形炉膛水冷壁周界长度增加30％-40％。基于冷态试验与数值计算分析，获得的环形炉膛优势炉型各循环回路间物料质量偏差不超过8％。结合炉型优化分析、炉内屏式受热面优化布置、炉型热力匹配特性及水动力安全性研究，提出了不带外置换热器、6个分离器并联H型布置的660MW超超临界环形炉膛循环流化床锅炉技术方案，锅炉结构简单紧凑，在满足炉膛传热要求的前提下，既有效降低了炉膛高度，又取消了常规的外置式换热器，提高了锅炉机组的运行可靠性与经济性，环形炉膛炉型是循环流化床锅炉大型化与高参数化发展的重要途径。

In order to solve the problems of secondary air penetration, heating surface arrangement and multi-separator optimization layout caused by large-scale and high parameterization of circulating fluidized bed （CFB） boiler, a new type annular furnace is proposed, which is completely different from traditional rectangular single-furnace and pant legs, The length of the annular fia-nace wall is longer than that of the conventional rectangular furnace wall by 30%-40%. Based on the cold test and the numerical calculation analysis, the material quality deviation of six loops for the optimized furnace type is not more than 8%. Based on the optimization analysis of the furnace type, the optimal layout of the heating surfaces in the furnace, the thermal matching characteristics and the hydrodynamic safety of the furtxace, the 660MW ultra-supercritical circulating fluidized bed boiler technology scheme, six cyclones arranged in parallel with H type, as well as with annular furnace and no external heat exchanger, is put forward, the boiler structure is simple and compact. Under the premise to meet the requirements of the furnace heat transfer, both effectively reduce the height of the furnace and abolish the conventional external heat exchanger, to improve the operational reliability and the economy of the boiler unit, the annular furnace is an important way for the large-scale and high-parameter development of the circulating fiuidized bed boiler units.