充气热管空气预热器的设计分析及应用

　　对充气热管空气预热器的结构进行分析和应用介绍 ,采用平界面模型 ,确定充气热管冷却段的有效长度。在原始参数相同的条件下 ,对充气和不充气的热管换热器进行试验 ,分析热管最低控制工作温度、排烟温度和换热面积之间的差异。工业试验和实际应用结果表明 :在变工况和高硫煤 (5 % - 7% )的条件下采用充气热管空气预热器具有十分优良的防腐蚀和防积灰的性能。
【作者单位】：重庆大学动力工程学院 重庆400044 (石程名;胡慧莉);重庆大学动力工程学院 重庆400044(李凌波)
【关键词】：充气热管;空气预热器;防腐蚀;防积灰
【分类号】：TK172.4
【DOI】：cnki:ISSN:1001-2060.0.2004-03-022
【正文快照】：
　　1　前　言采用热管作为换热元件实现了烟气换热在管外表面进行,且其加热段与冷却段的换热面是分开布置的,热端和冷端可以通过选用不同的肋化系数改变其两端的热阻比例,使换热面温度在一定程度上实现调节,可使壁温处于烟气酸露点腐蚀的相对安全区,避免或减轻低温烟气对金属壁的

　The structure of a gas-filled heat-pipe air preheater is analyzed along with a description of its applications. By using a flat interface model it is possible to determine the effective length of a gas-filled heat pipe cooling section. Under the condition of identical initial parameters the gas-filled heat-pipe heat exchangers and those not being gas-filled are tested and the difference among the heat-pipe minimum operating-control temperature, exhaust gas temperature and heat exchange area is analyzed. The results of industrial tests and practical use indicate that under off-design operating conditions and when firing coal of high sulfur content (5% - 7%) the gas-filled heat-pipe air preheaters excel in corrosion-prevention and ash-fouling resistance performance.
【Keyword】：gas-filled heat pipe, air preheater, corrosion prevention, ash fouling resistance