PURPOSE:To generate a soot-free hot blast by a method wherein the interior of a furnace body is partitioned by a partition wall having a through-hole, and each of the partitioned chambers is provided with an air intake port and a combustibles feed port in the same and tangetial direction. CONSTITUTION:The interior of a furnace body 1 is partitioned into an upper chamber 2 and a lower chamber 3 by a partition wall 7 having a through-hole 9. The upper chamber 2 is provided with an air intake port 10 and the lower chamber 3 with an air intake port 12 and a combustibles feed port 13, all the ports being directed in the same tangential direction relative to the furnace body 1. The major portion of the soot generated from the combustion of the combustibles is trapped and burnt in the lower chamber 3 of the hot-blast generating furnace, the remainder being trapped and burnt in the upper chamber 2, so that a soot-free hot blast can be generated.
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