An apparatus and method sinters or partially sinters green pellets in a selected temperature range to make proppant particles as the green pellets pass through a first central portion of the first vortex gas flow and exit the second end of the first cylindrical vessel and/or pass through a second ce
An apparatus and method sinters or partially sinters green pellets in a selected temperature range to make proppant particles as the green pellets pass through a first central portion of the first vortex gas flow and exit the second end of the first cylindrical vessel and/or pass through a second central portion of the second vortex flow and exit the fourth end of the second cylindrical vessel.
대표청구항▼
1. A method for sintering green pellets to make proppant particles comprising the steps of: providing an apparatus comprising:a first cylindrical vessel having a first end, a second end and a first longitudinal axis,a first vortex finder connected to the first end of the first cylindrical vessel and
1. A method for sintering green pellets to make proppant particles comprising the steps of: providing an apparatus comprising:a first cylindrical vessel having a first end, a second end and a first longitudinal axis,a first vortex finder connected to the first end of the first cylindrical vessel and aligned with the first longitudinal axis,a second cylindrical vessel having a third end, a fourth end and a second longitudinal axis,a second vortex finder connected to the second end of the first cylindrical vessel and aligned with the second longitudinal axis,an inlet passage disposed between the first vortex finder and the second vortex finder, connected tangentially to both the first cylindrical vessel proximate to the first end and the second cylindrical vessel proximate to the third end, and having an inlet and a third longitudinal axis, anda divider disposed within the inlet passage along the third longitudinal axis;supplying a heated gas to the inlet of the inlet passage;directing the heated gas into the first cylindrical vessel to form a first vortex gas flow and the second cylindrical vessel to form a second vortex gas flow using the divider; anddropping the green pellets into the first vortex finder or the second vortex finder or both the first vortex finder and the second vortex finder such that the green pellets are sintered or partially sintered in a selected temperature range to form the proppant particles as the green pellets pass through a first central portion of the first vortex gas flow and exit the second end of the first cylindrical vessel and/or pass through a second central portion of the second vortex flow and exit the fourth end of the second cylindrical vessel. 2. The method as recited in claim 1, further comprising the step of adding a material to the first vortex gas flow or the second vortex gas flow that coats or chemically reacts with the green pellets. 3. The method as recited in claim 1, further comprising the step of adjusting the first vortex gas flow and the second vortex gas flow by pivoting the divider. 4. The method as recited in claim 1, further comprising the step of adjusting the first vortex gas flow and the second vortex gas flow by moving the divider along the third longitudinal axis. 5. The method as recited in claim 1, the green pellets are partially sintered in the first cylindrical vessel and sintered in the second cylindrical vessel. 6. The method as recited in claim 1, the heated gas is supplied by a heated gas source comprising a high temperature blower, a high temperature compressor, an electrical heater or heated gas source, a burner, a thermal oxidizer, a jet exhaust, an oxy-fuel torch, a plasma torch, an internal combustion engine exhaust, or a combination thereof. 7. The method as recited in claim 1, the first cylindrical vessel and the second cylindrical vessel are cylinder-shaped or cone-shaped. 8. The method as recited in claim 1, the selected temperature range is between about 1,200° C. and 3,700° C. 9. The method as recited in claim 1, the selected temperature range is based on a chemical composition of the green pellets, a size of the green pellets, a resonance time of the green pellets within the first cylindrical vessel, the second cylindrical vessel or both. 10. The method as recited in claim 1, the heated gas source comprises: a third cylindrical vessel having a fifth end, a sixth end and a fourth longitudinal axis;a tangential inlet connected to or proximate to the fifth end;a tangential outlet connected to or proximate to the sixth end;an electrode housing connected to the sixth end of the third cylindrical vessel such that a first electrode is aligned with the fourth longitudinal axis of the third cylindrical vessel, extends into the third cylindrical vessel, and can be moved along the fourth longitudinal axis;a linear actuator connected to the first electrode to adjust a position of the first electrode within the third cylindrical vessel along the fourth longitudinal axis of the cylindrical vessel;a hollow electrode nozzle connected to the sixth end of the third cylindrical vessel such that a center line of the hollow electrode nozzle is aligned with the fourth longitudinal axis of the fourth cylindrical vessel; andwherein the tangential inlet and the tangential outlet create a third vortex flow within the third cylindrical vessel, and the first electrode and the hollow electrode nozzle create a plasma that discharges through the hollow electrode nozzle and into the inlet of the inlet passageway. 11. The method as recited in claim 1, the divider comprises a second electrode. 12. The method as recited in claim 11, the divider comprises a counter current feed tube containing a material that coats or chemically reacts with the green pellets. 13. The method as recited in claim 1, the heated gas is supplied by a heated gas source comprising: a first electrode proximate to inlet of the inlet passageway and aligned with the third longitudinal axis; andthe divider comprises a second electrode. 14. The method as recited in claim 13, the apparatus further comprises a power source connected to the first electrode and the second electrode. 15. The method as recited in claim 13, the first electrode or the second electrode contains a material that coats or chemically reacts with the green pellets. 16. The method as recited in claim 1, the heated gas is supplied by a heated gas source comprising: a first electrode proximate to the inlet of the inlet passageway and aligned in a plane substantially perpendicular to the third longitudinal axis; anda third electrode aligned longitudinally with the first electrode such that an electrical arc between the first and second electrodes intersects the third longitudinal axis. 17. The method as recited in claim 1, the heated gas comprises a plasma, the first vortex gas flow comprises a first vortex plasma flow, and the second vortex gas flow comprises a second vortex plasma flow. 18. The method as recited in claim 17, the apparatus further comprises a radio frequency source attached to or disposed within the first cylindrical vessel or the second cylindrical vessel or both. 19. The method as recited in claim 18, the radio frequency source comprises one or more radio frequency coils, a waveguide, or a combination thereof. 20. The method as recited in claim 1, the apparatus further comprises: a third vortex finder connected to the second end of the first cylindrical vessel and aligned with the first longitudinal axis;a first tangential outlet connected to or disposed proximate to the second end of the first cylindrical vessel such that the first vortex gas flow exits the first cylindrical vessel through the first tangential outlet. 21. The method as recited in claim 1, the apparatus further comprises: a fourth vortex finder connected to the fourth end of the second cylindrical vessel and aligned with the second longitudinal axis; anda second tangential outlet connected to or disposed proximate to the fourth end of the second cylindrical vessel such that the second vortex gas flow exits the second cylindrical vessel through the second tangential outlet. 22. The method as recited in claim 1, the apparatus further comprises: a third vortex finder connected to the second end of the first cylindrical vessel and aligned with the first longitudinal axis;a fourth vortex finder connected to the fourth end of the second cylindrical vessel and aligned with the second longitudinal axis; andan outlet passage disposed between the first vortex finder and the second vortex finder, connected tangentially to both the first cylindrical vessel proximate to second first end and the second cylindrical vessel proximate to the fourth end, and having an outlet.
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