| 摘要 |
PROBLEM TO BE SOLVED: To surely prevent dust and soot from intruding into a control panel even when the control panel is installed in an atmosphere containing large quantity of dust and soot by supplying pressurized air to the control panel and keeping the inside of the control panel under positive pressure. SOLUTION: In the case of removing dust and soot from dust-containing air sucked from a tunnel, etc., for automobile or the like to a ventilation duct 11, each dumper 81, 82 laid in a plural row is opened and an electric dust collecting part 71 and each driving drum 34, 35 are worked to remove dust from the dust-containing air by the electric dust collecting part 71 and a belt-like filter 21. The belt-like filter 21 is wound in the normal and reverse direction and constantly regenerated by blowing pressurized air to the surface from each air jetting nozzle 41, 42. On the other hand, the regeneration of the electric dust collecting part 71 is performed by blowing the pressurized air to the electrode plate surface from an air jetting nozzles 83. At this time, the inside of the control panel is kept under positive pressure. That is, air pressurized by a compressor 66 and dehumidified by a cooler 91 is fed to the control panel 92 to keep the inside of the control panel 92 under the positive pressure of, for example, 0.5-1 mmAq. |
