The multi-stage tornado generator installed in bellows of cupola and blast furnace is composed of primary effect body, secondary effect body, central effect body, end effect body, locating collar, central baffle, inner cone sleeve, vortex-proofing plug and nozzle. Said invention can make a large quantity of low-speed linear air flow of large range into an artificial tornado with large penetrating power, impact strength and stripping property, and the artificial tornado can be injected into furnace, and fed into centre of the furnace, and its air-flow can be uniformly distributed so as to make bed coke overheavy firing to raise the temp. of molten iron. |