| 摘要 |
PURPOSE:To remarkably improve the heat transfer from a heat-transfer tube to a coal layer, by blowing a part of a pyrolysis gas from the bottom of a vertical furnace at such a flow rate that a raw material is not fluidized. CONSTITUTION:A vertical furnace 1 is charged with a dried or preheated non- caking bituminous coal or brown coal 10 from a charging port 3 located at the top thereof. The bituminous coal or brown coal 10 is brought into contact with a heat-transfer tube 2 into which a high-temperature gas 11 is continuously fed, causing the bituminous coal or brown coal 10 to be pyrolitically decomposed. The mixture 12 of a pyrolysis gas with a tar is recovered through an extraction port 6 while a high-temperature char 13 is recovered through a discharge port 4 located at the bottom of the furnace 1. The mixture 12 is condensed using a condenser 7 to separate it into a pyrolysis gas 14 and a condensate 15. A part of the gas 14 is returned to the furnace 1 through a blowing port 5 using a blower 8. The sensible head of the high-temperature char is recovered by the gas 14 at the bottom of the furnace 1, and the heat is used for pyrolysis of the coal of the coal layer located at the top of the furnace 1.
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