WNS Horizontal oil-fired steam boiler 1 Factory ,35 years experience in boiler field 2ISO9001-2000 ,first ... light tube optimized combinztion of horizontal new boiler,fuel gas flow length , good heat transfer.1 All pull side butt welding ,stress the ... and wet back combustion charmer ,burning a large space,complete fuel combustion,effective absorption of thermal expansion,large radiation heatong.3 ...