In this technology, blast furnace off gas cleaning is performed using either a dust catcher or cyclone in conjunction with an annular gap wet scrubber. The scrubber consists of a movable cone assembly which allows the top pressure of the furnace to be controlled accurately and consistently. Increased top pressure helps good furnace operation and reduced fuel rate by decreasing velocity of the gases and by increasing retention time for the gas-solid reactions. In addition to reducing the fuel rate, this measure helps reduce the hot metal silicon variability and increases productivity.

   This technology is regarded to have a high application potential for China, India and the United States, and in particular for the new plants, as the retrofitting of existing blast furnaces may not be easy.