| 摘要 |
In the gasification of granular solid fossil fuel in a reactor wherein the fuel forms a fixed bed moving from top to bottom of the reactor under gravity, oxygen-containing gases and water vapor are fed into the fuel bed through nozzles in the lower portion of the reactor, molten slag at a temperature of about 1350 DEG to 1500 DEG C. is discharged through a conduit which is inclined to the horizontal, and product gas is withdrawn from the reactor above the fuel bed, the improvement which comprises feeding oxygen gas into the reactor adjacent to the inlet of the slag discharge conduit and directed from above onto the molten slag, thereby forming a leakage gas at a temperature of at least about 1500 DEG C. which leakage gas is withdrawn through the slag discharge conduit co-current with the slag. The leakage gas is separated from the slag in a lock chamber and mixed with the product gas. The temperature and/or composition of the leakage gas in the slag discharge conduit may be used to control the rate at which leakage is produced. A corresponding apparatus is described. This simplifies slag discharge and prevents clogging. |
