Pulse jet bag filter of the blast furnace gas dry raw gas (260 degrees) by the head of the raw gas to the manifold into the lower part of the bag filter box, mechanical separation, gas up through the bag filter fine dust attached to the bag brings together the outer surface of the net gas-pass filter to the upper box, net gas manifold into the hot stove use, when the filter after a certain time, with the increase of the dust filter bag surface, dust collector Yin force increased when the resistance increased to a certain value, issued by the electrical control system for the cleaning signal, export manifold pneumatic butterfly valve and ball valve automatically shut down, the pulse valve is open, the sub-cylinder nitrogen injection to the end of the precipitator following remain stationary, so that the cylinder body http://www. hjztcc.com / smaller dust about static deposition process the end of this process, export branch pneumatic butterfly valves and ball valves open, dust collector into the normal filter state, while the lower part of the ball valve to open by the impeller feeder, complete about box to clear ash process, the above process each valve to open and close, single-box test of the relative dust concentration is controlled by the PLC system, so that the cycle of work, shortage of gas to be purified.