☆多级循环燃油锅炉的研制。据报导,云南省昆明市星火节能技术研究所,最近研制出多级循环燃油无压热水锅炉,炉胆外以两组水套组成,水套之间、水套和炉胆之间有循环管连接,采用多级循环逆流换热和强制循环逆流换热相结合,使热效率高达93%,平均排烟温度172℃。同时,以夹缝冲刷加剧热传导,使水温迅速提高, ☆ multi-stage cycle of oil-fired boiler development. According to the report, Spark Technology Institute of Kunming, Yunnan Province, recently developed a multi-stage circulating oil-free pressurized hot water boiler outside the furnace with two sets of water jacket, water jacket, water jacket and the furnace between the cycle Pipe connection, using multi-stage countercurrent heat exchange and forced circulation countercurrent heat exchange, the thermal efficiency up to 93%, the average exhaust temperature of 172 ℃. At the same time, to increase the heat conduction cracks crevice, the water temperature increased rapidly,