| 摘要 |
PROBLEM TO BE SOLVED: To solve the difficulties of prior art that when a substance to be processed containing combustible components is heated for dry distillation, decomposition gas containing combustible components such as a tar fraction is produced, and hence on a gas conduit for guiding the produced decomposition gas to the next process (the decomposition gas is combusted in a combustion furnace) various components contained in the decomposition gas and soot are sometimes deposited, and particularly when the heating operation is interrupted and hence no decomposition gas is produced, there is no medium (gas) to be sucked existent in a thermal decomposition furnace and in the gas conduit, but there is existent therein sublimed substances and fine solid substances, which adhere to an internal wall surface of the gas conduit and is solidified to close the gas conduit and to cause local combustion. SOLUTION: A decomposition gas conduit is heated and is heat-insulated at the temperature of produced decomposition gas on above in a heat insulation pipe into which waste gas of a decomposition gas combustion furnace is introduced. When the heating of the thermal decomposition furnace is interrupted, the decomposition gas combustion furnace is interrupted after a predetermined time after the interruption of the heating of the thermal decomposition furnace.
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