| 摘要 |
A process is disclosed for generating burnable gas by gasifying water- and ballast-containing organic materials, be it coal or garbage. The drying, low temperature carbonisation and gasification steps are carried out separately. The heat taken from cooled gasified gas is supplied to the endothermic drying and low temperature carbonisation stages. The low temperature carbonisation gas is burned in a melting chamber furnace with air and/or oxygen or oxygen-rich flue gas and the liquid slag is evacuated, whereas the low temperature carbonisation coke is blown into the hot combustion gases that leave the melting chamber furnace at a temperature from 1200 to 2000 .degree.C. The endothermic reactions which take place and give carbon monoxide and hydrogen reduce the gasification temperature to 800-900.degree.C. Unnecessary or insufficiently reactive carbon is removed from the gasification gas, supplied to the melting chamber furnace and completely burned. The advantage of the invention is that the ashes may be transformed in to an elution-resistant granulated building material, in that a tar-free burnable gas is generated and in that oxygen consumption is strongly reduced in comparison with the fly stream gasification process.
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