| 摘要 |
<p>This invention relates to carbon dioxide blast cleaning system. In the present invention, the propelling of the dry-ice pellets is provided by cryogens, namely liquid nitrogen and/or liquid oxygen supplied under high pressure. In a preferred embodiment liquid carbon dioxide pellets are placed into a pellet hopper and a portable liquid nitrogen and/or liquid air storage tank is employed. The pellet hopper and the blast unit and blast gun(s) are located at the blast site, the portable cryogenic liquid nitrogen and/or liquid air tank with an ambient air vaporizer are located at or near the blast site. In this invention, as distinguished from the prior art, all the equipment and material for cleaning is located near the blast site and there is only one hose running to the nitrogen supply, there are no cables or hoses running to a truck air compressor or generator located away from the blast site. Pellets from the hopper are fed into the blast gun(s) through a blast unit. Cryogenic liquid nitrogen and/or oxygen is caused to pass through an ambient air vaporizer to vaporize the liquid gases and build such gases up to high pressure. The cryogenic gas under high pressure is then brought into the blast gun containing the pellets as aforesaid to effect propulsion of the pellets at high velocities through the gun nozzle to blast the surface or surfaces to be cleaned. <IMAGE></p> |
