近年来我国金属热风炉技术发展迅速 ,仅茶叶机械行业就先后推出了三回程式、喷流式 (属于双回程式 )、螺旋式和直流装配式等多种型式的热风炉。本文对热风炉的国内发展现状及腐蚀机理作了分析 ,并介绍了几种防护年限的计算方法 In recent years, China’s metal hot blast furnace technology has developed rapidly, only the tea machinery industry has launched a three-stroke, jet (belonging to double-return type), spiral and DC assembly-type and other types of hot stove. In this paper, the domestic development of hot stove and corrosion mechanism were analyzed, and introduced several methods of calculation of protective life