卿浩,周妍君,宋园园,杨冬,黄中,吕俊复

• 1:西安交通大学动力工程多相流国家重点实验室
• 2:清华大学能源与动力工程系热科学与动力工程教育部重点实验室

摘要(Abstract)：

为了保证超临界循环流化床（CFB）锅炉具有良好的宽负荷运行特性及深度调峰的能力，对跨临界压力变化时工质与水冷壁间的动态特性进行试验研究。采用Φ25.0 mm×3.5 mm的垂直上升光管，在压力20.0～23.0 MPa，质量流速400～800 kg/(m2·s)试验工况范围内开展了近临界稳态传热试验和跨临界压力阶跃动态特性试验。结果表明：近临界压力下，增大质量流速、减小内壁热负荷、降低压力都能使传热恶化发生时的干度减小，对应的流体焓值增大，使传热恶化推迟发生；跨临界压力阶跃变化时，受热管内流体可能发生传热恶化导致壁温飞升，但随着质量流速的增大温度又回落到正常值；壁温飞升点与内壁面的传热随时间依次经历传热恶化阶段，过冷沸腾传热强化阶段和单液相换热阶段；各参数对跨临界压力阶跃变化时传热恶化的影响与对近临界稳态试验的传热恶化的影响相同，质量流速减小和内壁热负荷增大会使传热恶化发生的位置提前，同时壁温飞升的数值更大。

关键词(KeyWords)： CFB锅炉;深度调峰;跨临界动态特性;垂直上升管;传热恶化

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目（2022YFB4100303）~~

作者(Author): 卿浩,周妍君,宋园园,杨冬,黄中,吕俊复

DOI: 10.19666/j.rlfd.202303036

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