| 摘要 |
Fine grained fuel such as coal dust is gasified at an elevated pressure by passing the fuel from a supply tank which is at atmospheric pressure by a pump into a pressurized lock basin and therefrom into the gasifier, the fuel during such movement retaining its loose consistency. The pump in this case comprises an outer cylinder; a piston movable in said cylinder; an inlet opening for said fuel in the top of said cylinder; a hollow space in said piston for receiving said fuel, the said hollow space being open at the top and bottom, an opening in said top wall of the cylinder for receiving or releasing a gaseous medium under pressure; an outlet passage for said fuel in the bottom of said cylinder; valve means for introducing or discharging said pressure gas into or from said gas inlet and outlet; and means for moving said piston in said cylinder so as to bring said hollow space, in a first position, into alignment with said fuel inlet passage to receive said fuel, then, in a second position, to bring the piston into alignment with the said pressure gas inlet and outlet so as to cause the pressure gas to enter the fuel filled hollow space or be released therefrom and, in a third position, to bring the piston in alignment with said fuel outlet passage so as to discharge the fuel into the lock basin. |
