... smoke and fire can be revolved strongly and back, the fuel can be burned out in low oxygen, so it is ... area, also easier to be installed.4. High efficiency. The fuel is fired suspended in big furnace, the back pressure of ... . Because there are 2 reheat cycle in the furnace, the fuel can be burned enough, also the smoke dust is little ... front and back smoke box. Steam Boiler (oil, gas, coal, biomass)