Fluidization and distribution
AssigneePaul Wurth S.A.
InventorLeon Ulveling
Life of this patent
Estimating the term…
Abstract
A pulverized material, particularly coal or lignite, is maintained in a fluidized state in a storage container and is released therefrom into a carrier gas stream. The gas for causing fluidization and maintaining a pressure in the container which is greater than the carrier gas pressure is in part obtained by recycling gas vented from the container, the vented gas being filtered and increased in pressure. The vented gas may also be employed to aid in the delivery of the pulverized material into the container.
Claims20
In a process for transportation of a pulverized material, the material being delivered to and temporarily stored in a first container and being subsequently fed from the first container to a second container, the material being thereafter withdrawn from the second container and fluidically conveyed to a consuming device, the improvement comprising:
- injecting a pressurized gas into the second container to maintain a pressure therein greater than the consuming device pressure;
- venting some of said gas from the second container;
- filtering pulverized material from the vented gas;
- increasing the pressure of the vented and filtered gas;
- re-injecting at least a portion of the vented and pressurized gas into the second container;
- selectively delivering gas to the first container at a pressure which is at least as high as the pressure within the second container;
- establishing communication between the first and second containers during the delivery of pressurized gas to the first container whereby the pressurized gas aids in feeding material from the first container into the second container;
- and
- continuing to vent gas from the second container during the time that communication is established between the containers whereby at least a portion of the gas injected into the second container is filtered, increased in pressure and thereafter delivered to the first container.
Apparatus for use in the conveying of pulverulent material comprising:
- an intermediate storage tank, said intermediate tank receiving the material from a source;
- a final storage container;
- means for selectively establishing communication between said tank and said container whereby material may be transferred from the tank into said container;
- means for withdrawing material from said container and entraining the withdrawn material in a carrier fluid;
- means for injecting a pressurized gas into said container to establish pressure therein in excess of the pressure of the carrier fluid;
- means for venting gas from said container;
- first fluid circuit means for conducting the gas passing through said venting means to said injecting means whereby the vented gas is re-injected into said container, said first fluid circuit means including means for filtering pulverized material from the vented gas and means for increasing the pressure of the filtered gas;
- and
- second fluid circuit means for supplying at least a portion of pressurized gas from said container to said tank at least during periods when said communication establishing means is permitting the transfer of material, said pressurized gas aiding in the movement of material from said tank into said container.
Dependencies are inferred from the claim text.