| 摘要 |
In a method for gasifying baking hard coal by way of a pressurized gasifier, the hard coal is introduced into a shaft-shaped gas generator and travels downward in the same in the form of a fluidized bed in the countercurrent to a gasifying agent introduced from beneath into the fluidized bed, wherein the hard coal is successively dried, carbonized, gasified, and burnt, and the majority of the obtained product gas is conducted out of the gas generator by way of an upwardly closed annular space formed by a pipe section attached in the upper section of the gas generator and the inner side of the gas generator located opposite of said pipe section, and the residual quantity of the product gas is suctioned through the segment of the fluidized bed located in the pipe section, conducted to the outside, and recirculated into the annular space. In order to improve the gas generator output, the invention proposes that the segment of the fluidized bed located in the pipe section be heated by the residual quantity of the product gas suctioned through to a temperature of 260 to 380ºC and loosened mechanically in the process, and that the ash particles contained in the residual quantity of the product gas exiting the fluidized bed toward the top and the fine grain portion of the added hard coal entrained by the product gas be separated and added to the segment of the fluidized bed located in the pipe section. |
