| 摘要 |
PURPOSE:To decrease the amt. of waste gases by adding hydrocarbon fuel and air to the gaseous atmosphere discharged from the inside of a furnace, burning the gas to form an exothermic type gas, and causing the hydrocarbon fuel and the air mixed therewith to react with each other by the heat generated by said gas to form an endothermic type gas, and recirculating both gases at a proper ratio in the furnace. CONSTITUTION:Hydrocarbon fuel and air are added through a piping 7 to the gaseous atmosphere discharged from a heat treating furnace 1 through a piping 6 to control the air to fuel ratio within a 0.65-1 range, and the gaseous mixture blown from a burner 5 is burned in a heat radiating tube 3, whereby an exothermic type gas is formed. The heat generated by the combustion is radiated from the tube 3 into the furnance 1 to heat the objects to be heated and a reflection tube 4. On the other hand, a gaseous mixture of hydrocarbon fuel of <=0.65 air to fuel ratio is supplied through a pipe 8 into the tube 4 and is caused to decompose and react by heating, whereby an endothermic type gas is formed. Both gases are introduced at proper ratios through pipes 9, 10 into the furnace 1, and are cyclically used. The remaining gases are discharged through a pipe 12. |
