王文焕,许朋江,薛朝囡,居文平,周波,戴晓业,史琳

• 1:清华大学能源与动力工程系
• 2:西安热工研究院有限公司
• 3:华能(浙江)能源开发有限公司玉环分公司

摘要(Abstract)：

针对超超临界燃煤机组背压抽汽汽轮机（backpressure extraction steam turbine,BEST）方案的研究现状，建立了含BEST的超超临界燃煤机组的变工况计算模型和?分析模型，深入探究了主蒸汽流量、温度、压力，汽轮机背压以及BEST回热抽汽级数对机组热力性能的影响规律。结果表明：机组的?效率随主蒸汽流量先升高后降低，在主蒸汽流量为750 kg/s时达到最大值（52.42%）；机组?效率随主蒸汽温度和压力的增大而提高，随汽轮机背压的增大而降低，在低负荷时机组热力性能受背压的影响更大；此外，BEST回热抽汽级数对机组热力性能的影响十分显著，级数为4级时与系统设计方案匹配度最好，热力性能最优。所述计算方法和BEST回热抽汽级数选择方案，可为超超临界机组方案设计与运行优化提供参考。

关键词(KeyWords)： 超超临界燃煤机组;BEST技术;?分析;变工况

Abstract:

Keywords:

基金项目(Foundation): 中国华能集团有限公司总部科技项目（HNKJ20-H73）~~

作者(Author): 王文焕,许朋江,薛朝囡,居文平,周波,戴晓业,史琳

DOI: 10.19666/j.rlfd.202212237

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