本文介绍了热水锅炉复合循环概念提出的过程,及它的工作原理和运行特点,指出它同时具有自然循环热水锅炉与强制循环热水锅炉的优点,是一种适合于我国目前具体情况的,能保证热水锅炉安全运行的循环方式。本文还提出了复合循环热水锅炉水冷壁内工质流速的理论计算方法,介绍了由于将回水管直接插入下降管所增加的循环流动压头△S的计算公式。最后还介绍了本计算方法对上海星火锅炉厂120万千卡/时热水锅炉进行理论计算结果与模化试验结果的比较。 This paper introduces the process of hot water boiler compound cycle concept, and its working principle and operating characteristics, points out that it has both the advantages of natural circulation hot water boiler and forced circulation hot water boiler is a suitable for our current specific circumstances , To ensure the safe operation of hot water boiler cycle. This paper also put forward the theoretical calculation method of the working fluid velocity in the water wall of the compound circulating hot water boiler, and introduced the calculation formula of the circulating fluid pressure head △ S added by inserting the return pipe directly into the downcomer. Finally, the calculation method is also introduced to compare the theoretical calculation results of the 1.2 million kcal / hour hot water boiler in Shanghai Spark Boiler Factory with the results of the model test.