| 摘要 |
PURPOSE:To control the amount of heat recovered easily, to shorten the starting time and to improve the heat efficiency, by controlling the amount of the waste gas to flow through respective two branched flues of heat recovery parts of combustion with valves. CONSTITUTION:Nitrogen gas is led from the feed line 2 to the reaction tube 4, and a catalyst in the reaction tube 4 is heated by igniting the burner 8. In this step, the valve 19 of the steam overheating device 10 is closed and the valve 18 of the boiler 9 of heat recovery is wholly open so that waste gas is totally introduced into the flue of the boiler 9 for heat recovery. The set pressure of the steam drum 16 is lowered so that steam generated is discharged out of the system, and only the leaked gas from the valve 19 is made to flow in the flue of the steam overheating device 10. Steam is sent from the device 10 to the reaction tube 4 by opening the valve 21, and heated at a high temperature. Hydrogen is fed to the reaction tube 4, and the catalyst is reduced. The feed, e.g., naphtha, is led to the reaction tube 4 and reformed into methane, carbon monooxide, etc. while the steam flow being automatically controlled by the valves 18 and 19. |
