300MW S-CO2一次再热燃煤锅炉炉膛结构设计优化  

Furnace Structure Design Optimization of 300MW S-CO Single Reheat Coal-fired Boiler

作　　者：佟勇婧 段立强[1] 庞力平[1] TONG Yongjing;DUAN Liqiang;PANG Liping(School of Energy Power and Mechanical Engineering,North China Electric Power University,Changping District,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京市昌平区102206

出　　处：《中国电机工程学报》2020年第17期5557-5565,共9页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2017YFB0602101)。

摘　　要：基于300MW一次再热分流再压缩超临界二氧化碳(S-CO2)布雷顿循环,优化锅炉受热面布置方式,为解决工质压降大和炉膛管壁温度高问题,对S-CO2锅炉炉膛进行结构设计优化,提出S-CO2锅炉炉膛可采用单炉膛双切圆、垂直管屏的结构布置方式。建立系统性能分析模型并计算了膛侧工质压降和管壁温度并与原始方案进行了比较。结果表明:设计负荷下,优化方案过热气冷壁压降和再热气冷壁压降明显降低。优化后因工质压力损失的减小,从而使系统的发电效率上升、发电标准煤耗降低,在设计负荷下,系统标准发电煤耗减少2.8g/(kW×h)。沿炉膛高度方向,优化方案气冷壁的管外壁最高温度显著低于原始方案,优化方案有更宽的安全裕度,从而保证机组的安全运行。On the base of 300 MW split-flow recompression and single reheat supercritical CO2(S-CO2)Brayton cycle,the layout of boiler heating surface optimized.In order to solve the problems of large pressure drop of working fluid and high temperature of furnace tube wall,the furnace structure of S-CO2 boiler was optimized.In the optimization scheme,furnace of S-CO2 boiler adopts the single furnace double-tangential circle and the vertical tube structure.The system performance analysis model was built,and both the working fluid pressure drop of furnace side and the temperature of tube wall were calculated and compared with those of the original scheme.The results show that under the design load,the pressure drops of both the superheated cooling wall and the reheated cooling wall in the optimization scheme are obviously reduced.After optimization,due to the decrease of working fluid pressure loss,the power generation efficiency increases and the standard coal consumption of power generation decreases.Under the design load,the system standard coal consumption of power generation is reduced by 2.8 g/(kW×h).Along the furnace height direction,the maximum temperature of the tube outer wall in the optimization scheme is obviously lower than that of the original scheme,which shows that the optimization scheme has a wider safety margin,so as to ensure the safe operation of the unit.

关 键 词：超临界二氧化碳(S-CO2)循环 燃煤锅炉 炉膛结构设计 不均匀系数 

分 类 号：TK123[动力工程及工程热物理—工程热物理]