Pyrolysis reactor system and method
A system for the pyrolysis of a pyrolysis feedstock utilizes a pyrolysis reactor for producing pyrolysis products from the pyrolysis feedstock to be pyrolyzed. An eductor condenser unit in fluid communication with the pyrolysis reactor is used to condense pyrolysis gases. The eductor condenser unit has an eductor assembly having an eductor body that defines a first flow path with a venturi restriction disposed therein for receiving a pressurized coolant fluid and a second flow path for receiving pyrolysis gases from the pyrolysis reactor The second flow path intersects the first flow path so that the received pyrolysis gases are combined with the coolant fluid. The eductor body has a discharge to allow the combined coolant fluid and pyrolysis gases to be discharged together from the eductor. A mixing chamber in fluid communication with the discharge of the eductor to facilitates mixing of the combined coolant fluid and pyrolysis gases, wherein at least a portion of the pyrolysis gases are condensed within the mixing chamber.
1. A process for the pyrolysis of a pyrolysis feedstock comprising:
introducing the pyrolysis feedstock into a pyrolysis reactor;
allowing at least a portion of the feedstock to be converted to pyrolysis gases in a pyrolysis reaction within the pyrolysis reactor;
conducting the pyrolysis gases to an eductor condenser unit in fluid communication with the pyrolysis reactor, the eductor condenser unit comprising:
an eductor assembly having an eductor body that defines a first flow path with a venturi restriction disposed therein for receiving a pressurized coolant fluid and a second flow path for receiving pyrolysis gases from the pyrolysis reactor, the second flow path intersecting the first flow path, the eductor body having a discharge to allow the discharge of fluids from the first and second flow paths to be discharged together from the eductor body; and
a mixing chamber in fluid communication with the discharge of the eductor assembly;
introducing the pyrolysis gases into the second flow path of the eductor assembly while cooling fluid is introduced into the first flow path of the eductor assembly so that the pyrolysis gases are combined with the cooling fluid to form a combined fluid stream that is discharged from the discharge of the eductor assembly; and
introducing the combined fluid stream into the mixing chamber to facilitate mixing of the combined fluid stream to form a liquid pyrolysis product; and wherein
the pyrolysis gases are initially conducted to an upstream condenser unit in fluid communication with the pyrolysis reactor; and further comprising:
condensing a portion of condensable pyrolysis gases in the upstream condenser unit to form a first liquid pyrolysis product;
separating any non-condensed pyrolysis gases from the first liquid pyrolysis product, the separated non-condensed pyrolysis gases from the first liquid pyrolysis product forming the pyrolysis gases conducted to the eductor condenser unit; and wherein
the upstream condenser unit further comprises a condenser inlet clearing assembly to facilitate clearing of pyrolysis oil and/or solids buildup from an inlet of the upstream condenser unit.
2. The method of claim 1 , wherein:
a mixing unit having a mixing housing defines the mixing chamber, the mixing housing being coupled to the discharge of the eductor body.
3. The method of claim 2 , wherein:
the mixing chamber has mixing elements or baffles stationarily mounted within the mixing housing.
4. The method of claim 3 , wherein:
the mixing elements or baffles are helical mixing elements or baffles.
5. The method of claim 1 , wherein:
the clearing assembly is configured to provide a jet or jets of a liquid or gas that is jetted into the inlet of the upstream condenser unit at a sufficient rate and pressure to remove any pyrolysis oil and/or solids buildup.
6. The method of claim 1 , wherein:
the upstream condenser unit further comprises a condenser inlet clearing assembly to facilitate clearing of pyrolysis oil and/or solids buildup from an inlet conduit of the upstream condenser unit, the condenser inlet clearing assembly including a plunger or piston that is closely received within the inlet conduit, the plunger or piston being moved within the inlet conduit to clear or push away any accumulated materials in the inlet conduit.
7. The method of claim 6 , wherein:
the plunger or piston is provided with one or more interior passages or openings that extend through the thickness of the piston or plunger and that are spaced radially inward from an outer circumference of the piston or plunger body that allow pyrolysis gases to flow through the plunger or piston through the one or more interior passages or openings.
8. The method of claim 1 , wherein:
the upstream condenser unit is a direct contact condenser.
9. The method of claim 1 , wherein:
the pyrolysis feedstock is biomass.
10. The method of claim 1 , further comprising:
separating condensed pyrolysis gases, coolant fluid, and any non-condensable gases received from the eductor condenser unit in a separating unit in fluid communication with a discharge of the mixing chamber.
11. The method of claim 1 , wherein:
the clearing assembly is actuated upon a selected monitored pressure difference or drop between the pyrolysis gases introduced into the upstream condensing unit and the internal pressure of the upstream condensing unit.