引入烟气再循环的超临界二氧化碳燃煤锅炉冷却壁布置及壁温特性分析  

Cooling wall arrangement and wall temperature characteristic analysis for supercritical carbon dioxide coal-fired boiler with flue gas recirculation

作　　者：杨丹蕾 唐桂华 范元鸿 李小龙 王思琦 YANG Danlei;TANG Guihua;FAN Yuanhong;LI Xiaolong;WANG Siqi(Key Laboratory of Thermo-Fluid Science and Engineering,Ministry of Education,School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学能源与动力工程学院热流科学与工程教育部重点实验室,陕西西安710049

出　　处：《热力发电》2020年第10期144-150,共7页Thermal Power Generation

基　　金：国家重点研发计划项目(2017YFB0601803)。

摘　　要：超临界二氧化碳(S-CO2)布雷顿(Brayton)动力循环由于高效、紧凑等特性被广泛关注。然而,对于大型(1000 MW等级)S-CO2燃煤电厂,较高的冷却壁入口温度以及较大的炉膛燃烧热流密度会导致冷却壁过热超温。对此,本文建立了锅侧燃烧/炉侧S-CO2传热耦合模型用于冷却壁的热安全分析。通过冷却壁一维周向平均温度计算,提出了引入烟气再循环降低冷却壁温度的方法,并进一步提出了冷却壁分区顺逆流的优化布置。此外,考察了冷却壁三维温度分布,并进一步引入了螺旋冷却壁降低炉膛周向热点温度。结果表明,本文提出的优化方法可以有效降低冷却壁温度并消除局部热点,对大容量S-CO2燃煤锅炉的工程设计具有指导意义。The supercritical carbon dioxide(S-CO2)Brayton cycle has attracted wide attentions owing to its high efficiency and compactness.However,for large scale(around 1000 MW)S-CO2 coal-fired power plants,the high S-CO2 inlet temperature coupled with high combustion heat flux will induce the cooling wall overheating.In the present work,the coupled model between the furnace combustion and the S-CO2 heat transfer is developed for the cooling wall thermal safety analysis.In one-dimensional calculation of the circumferential average cooling wall temperature,the flue gas recirculation method is introduced to reduce the cooling wall temperature,and the onedimensional cooling wall counter flow arrangement is further proposed.Moreover,the three-dimensional cooling wall temperature distribution is examined,and the spiral cooling wall is further introduced to reduce the circumferential hot spot temperature.The results show that,the optimization methods in the present work can effectively reduce the cooling wall temperature and eliminate the local hot spot,which can provide guidance for the engineering design of large scale S-CO2 boilers.

关 键 词：超临界二氧化碳 燃煤锅炉 烟气再循环 螺旋管冷却壁 壁温特性 顺逆流 优化布置 

分 类 号：TK122[动力工程及工程热物理—工程热物理]