热电联供系统中烟气冷凝传热性能试验研究

针对烟气余热不能充分回收的问题,对能够充分回收烟气余热的新型热电联供系统中的烟气冷凝热回收设备进行试验研究,重点研究该工况下光滑管烟气冷凝设备的传热性能.研究结果表明,在该试验工况下,干式、冷凝段传热系数可达60 W/(m~2·K),冷凝段传热系数为90～100 W/(m~2·K),冷凝段传热系数约为干式段传热系数的1.5～1.7倍,并整理了该工况下的传热准则关系式,为该系统型式的推广应用提供设计与运行依据.

Experimental Study of the Condensation Heat Transfer Performance of Flue Gases in a Heating-and-power Cogeneration System

Concerning the problem of the inability to fully recover the waste heat in flue gases,experimentally studied was a flue gas condensation heat recovery device of an innovative heating-and-power cogeneration system that could fully recover the waste heat in flue gases.In this connection,the research emphasis was laid on the heat transfer performance of a smooth tube flue-gas condensing equipment item under the relevant operating condition.The research results indicate that under the test operating condition,the heat transfer coefficient of the dry type condensing section can be as high as 60 W/(m~2·K) with that of the condensing section being 90 to 100 W/(m~2·K).The heat transfer coefficient of the condensing section is about 1.5 to 1.7 times that of the dry type one.The authors have also worked out a heat transfer criterion-based relational expression under the operating condition,thus providing an underlying basis for popularizing the design and operation of the system in question.