Abstract When supercritical carbon dioxide (S–CO2) Brayton cycle is introduced into conventional coal-fired power plant, there exists the problems in S–CO2 boiler configurations due to the working medium physical properties’ change. This paper is taking a typical 1000 MW single reheat double-tangential circular boiler as example and investigations focus on the key issues of S–CO2 power plant with traditional boiler configuration from the thermodynamic system, combustion and heat transfer in the furnace, flow and heat transfer in tube. The results show that the studied traditional boiler configuration does not adapt for the 1000 MW S–CO2 coal-fired single reheat power plant for the mismatch heat duty. The effects of boiler size and flue gas recirculation ratio on the heat duty distribution and boiler performance are analyzed. Decreasing the boiler heat duty singly will have a negative impact on boiler performance. The newly developed “partial expansion at the upper zone + double furnace + symmetry flow mode” boiler configurations for the S–CO2 Brayton cycle are presented in order to coordinate the heat duty distribution and boiler performance. The overall net efficiency of the innovative 1000 MW single reheat S–CO2 power plant is up to 48.26%, higher ∼4% than the same-grade traditional steam power plant.

中文翻译：

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1000MW燃煤超临界二氧化碳电厂关键问题及创新双切线循环锅炉配置

摘要 在常规燃煤电厂引入超临界二氧化碳（S-CO2）布雷顿循环后，由于工质物理性质发生变化，S-CO2锅炉配置存在问题。本文以典型的1000 MW单再热双切线循环锅炉为例，从热力系统、炉内燃烧与传热、流量和热量等方面对传统锅炉配置的S-CO2电厂的关键问题进行研究。管内转移。结果表明，所研究的传统锅炉配置不适用于 1000 MW S-CO2 燃煤单次再热电厂的失配热负荷。分析了锅炉尺寸和烟气再循环比对热负荷分布和锅炉性能的影响。单独降低锅炉热负荷会对锅炉性能产生负面影响。新开发的“上区局部膨胀+双炉+对称流模式”锅炉配置用于S-CO2布雷顿循环，以协调热负荷分布和锅炉性能。创新的 1000 MW 单次再热 S-CO2 发电厂的整体净效率高达 48.26%，比同等级的传统蒸汽发电厂高出约 4%。