This paper introduces a type of composed water-tube boiler that is fitted with a new type of cast iron air heater instead of the common cast iron economiser.

• 本文介绍了组装式热水锅炉，采用新型铸铁空预器代替省煤器，可以克服省煤器缺点，加热空气，强化炉内燃料的燃烧，回收余热，从而达到提高锅炉热效率，增加出力的目的。