回焰锅炉 return flame boiler ; return flue boil ; back-flame boiler ; rectum-flue boiler

回焰式火管锅炉 return fire-tube boiler ; return tube boiler ; return flame boiler

回焰蒸汽锅炉 return tabular steam boiler

立式回焰锅炉 vertical return tube boiler

回焰式锅炉 return-flue boiler

中心回焰 centrally-back flame

卧式回焰锅炉 horizontal return flue boiler

回焰废气锅炉 return flow exhaust gas boiler

火焰回火 flame tempering