Mechanical pyrolysis in a shear retort
Mechanical visbreaking and pyrolysis between counter-rotating coaxial centrifugal impellers in a continuous radial counterflow process minimizes wastewater discharges. In one example, a cataclastic shear retort comminutes, shear thins, and shear heats an axial feed, such as tar sand, oil shale, coal tailings, distillation bottoms, or lignite. Pyrolyzing the feedstock in this shear retort yields a product stream of gases, naphthas, and oils which first mixes with the feedstock and then is axially extracted, while spent solids are simultaneously extruded from the periphery as coked devolatilized residue, such as char sand for upgrading soil to terra preta. Recirculation of shear-heated solids in long residence time within the shear retort brings heat from the spent solids at the periphery to the feedstock without an external heated sand loop. CO2 emissions from combustion to heat water for oil extraction are eliminated.
1. Apparatus for continuous processing to extract a product stream from a feedstock comprising unconventional oil source materials, the apparatus comprising:
opposed centrifugal impellers having a common axis of rotation and spaced apart so as to define a radial workspace between them, the workspace extending from said axis of rotation to a periphery,
one of said impellers comprising a central axial feed port for introducing the feedstock into the workspace, and
the other impeller comprising a central axial exhaust port for extracting the product stream from the workspace;
a prime mover connected to the impellers so as to cause their counter-rotation about said axis of rotation;
means for introducing the feedstock into the workspace through the axial feed port as the impellers counter-rotate; and
means for collecting solids extruded from the periphery.
2. The apparatus of claim 1 , wherein said prime mover connects to the impellers by at least one peripheral drive wheel.
3. The apparatus of claim 1 , further comprising an axial exhaust pump which communicates with the workspace through the axial exhaust port.
4. The apparatus of claim 1 , wherein the prime mover comprises a wind turbine.
5. The apparatus of claim 1 , wherein at least one impeller has a conical surface.
6. Apparatus for devolatilizing residue from extraction of oil from unconventional oil source materials so as to produce a mixture of minerals and coke, the apparatus comprising:
opposed centrifugal impellers having a common axis of rotation and spaced apart so as to define a radial workspace between them, the workspace extending from said axis of rotation to a periphery,
one of said impellers comprising a central axial feed port for introducing the feedstock into the workspace, and
the other impeller comprising a central axial exhaust port for extracting liquids and gases from the workspace;
a prime mover connected to the impellers so as to cause their counter-rotation about said axis of rotation;
means for introducing said residue into the workspace through the axial feed port as the impellers counter-rotate; and
means for collecting said mixture of minerals and coke extruded from the periphery.
7. The apparatus of claim 6 , wherein said prime mover connects to the impellers by at least one peripheral drive wheel.
8. The apparatus of claim 6 , wherein the prime mover comprises a wind turbine.
9. An apparatus for processing ore by continuous comminution and shear heating, the apparatus comprising:
opposed centrifugal impellers having a common axis of rotation and spaced apart so as to define a radial workspace between them, the workspace extending from said axis of rotation to a periphery,
one of said impellers comprising a central axial feed port for introducing the feedstock into the workspace, and
the other impeller comprising a central axial exhaust port for extracting liquids and gases from the workspace;
a prime mover connected to the impellers so as to cause their counter-rotation about said axis of rotation;
means for introducing the ore into the workspace through the axial feed port as the impellers counter-rotate; and
means for collecting the processed ore that is extruded from the periphery.
10. The apparatus of claim 9 , wherein said prime mover connects to the impellers by at least one peripheral drive wheel.
11. The apparatus of claim 9 , wherein the ore comprises a solvent.