| 摘要 |
PURPOSE: To recover sensible heat of high-temperature exhaust gas efficiently without diluting it with air by a method wherein fuel gas, to which water vapor is added, is introduced onto a modification catalyst layer, heated by the exhaust gas of combustion, while the gas is preheated by effecting the heat exchange of the exhaust gas of combustion, which has heated the modification catalyst layer. CONSTITUTION: Mixture gas, produced by adding water vapor to fuel COG, is preheated in a counter-flow type heat exchange 2 by the exhaust gas 1 of a heating furnace and is introduced into a modifying device 4. The modifying reaction of the mixture gas 3 is generated while passing through a catalyst filling layer while the amount of heat, necessary for the reaction, is supplied from the exhaust gas 5 of heating furnace, flowing through the outside of a tube and having a temperature of 900 deg.C. The fuel COG and the water vapor are changed into modified gas 6, including the latent heat of combustion, at the outlet side of the modifier while heat exchange between the modified gas 6 and precombustion air 7 is effected in the heat exchanger 8 to unify the heat and supply it to a reheating furnace 9 to burn it by a burner. Exhaust gas 5, discharged out of the modifying device 4, is divided into exhaust gas 1 and exhaust gas 11 while the exhaust gas 11 preheats the normal temperature combustion air 13 for the heating furnace through an exhaust gas heat exchanger 12. |
