| 摘要 |
The subject of the invention is a new method and arrangement for converting a carbon- bearing feed material into a gas having sufficiently small contents of tars and lighter hydrocarbons for the application in question. The method employs one or more fluidized-bed processing stages and gas exiting one or more of these stages is subjected to a reforming treatment either in the presence or absence of catalyst. Gas exiting the reforming stage is mixed with a stream of solids, the main component of which is bed material and another component of which is char, the said stream of solids having been led from one or more of the fluidized-bed processing stages, preferably from that to which the carbon-bearing feed material is fed. Downstream of the mixing stage, solids are separated from the gas and then recycled or led to one or more of the fluidized-bed processing stages. The method and arrangement enable heat to be transferred from the hot reformed gas to the gasification stage(s) in an efficient and cost-effective way |
