Incinerator

An incinerator comprising:

• a cylindrical combustion chamber;
• and
• a plurality of combustion-promoting blast pipes each of which is disposed so as to project from an inner wall of the combustion chamber and extend in a vertical direction thereof, wherein
• the combustion-promoting fluid blast pipes are of a quadruple-pipe construction, each comprising an air-supply pipe, a steam-supply pipe which is provided concentrically outside of the air-supply pipe, a combustible-gas supply pipe provided concentrically outside of the steam-supply pipe and a water pipe which is provided concentrically further outside thereof for protecting the air-supply pipe, the steam-supply pipe and the combustible-gas supply pipe from heat, and a plurality of nozzles are provided on each of the combustion-promoting fluid blast pipes, the nozzles being positioned facing in one circumferential direction of the combustion chamber so that a combustion-promoting fluid blown out from the combustion-promoting fluid blast pipes forms a swirling flow within the combustion chamber;
• and
• the air-supply pipes, the steam-supply pipes and the combustible-gas-supply pipes in the combustion-promoting fluid blast pipes are connected respectively to a high-pressure air-supply source, a steam-supply source and a combustible-gas supply source, so that steam and combustible gas can be selectively blown from each of the supply sources air into the combustion chamber as the combustion-promoting fluid via the combustion-promoting fluid blast pipes.