| 摘要 |
PURPOSE:A pressure-releasing valve is installed so that it is opened according to the signals from the pressure detector to maintain the pressure inside the furnace equal to the atmospheric pressure to avoid burst on start and shutdown and prevent the damage of the installation. CONSTITUTION:Melted iron 10 is introduced from the inlet 3 into the gasification furnace and all the valves are closed. Then, the rotor for cut-feeding powdery coal is stopped. The pressure-releasing valve 7 is opened, valves 19-3 is opened to introduced the carrier gas into the furnace. Then, the rotor 22 is started and simultaneously valve 19-1 is opened to introduce oxygen and powdery coal into the furnace to ignite fire. The gas produced is purged through the release valve 7 out of the furnace to burn the flare stack 16 to avoid the gasifier from being damaged. The combustion of the powdery coal in the furnace is detected with a radiation thermometer 17 and the difference in pressure between the inside of the furnace and the outside is detected with the sensor 24 to control the valves 25-1-25-3 to keep the pressure inside the furnace constant. |
