退火炉管 Furnace tube ; annealing furnace tube

水火管锅炉 fire tube boiler ; DZL

直接火管锅炉 direct fire tube boiler

火管锅炉烟管锅炉 Scotch boiler ; fire-tube boiler

内火管锅炉 inside fire-tube boiler ; tube boiler

火管式锅炉 fire tube boiler ; Fire-tube Type Boilers

火管加热炉 fire tube heater

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

兰开夏式火管锅炉 lancashire boiler