... three return fire and water pipe hybrid boiler Steam boiler (DZL)Product Introduction:1, adopts cast- ... coal, fuel wood, wood scraps, etc. Can be used as fuel.2, few movement part, investment, low maintenance ... exchanger, SFP efficient floating disc heat exchangers, steam regenerator, frequency conversion water supply equipment and desulfurization ... bars ,links ,drive bars : 2t Coal-fired steam boilers