Staged biomass fractionator
View Patent ↗Various biomass reactors systems and methods of pyrolyzing biomass are disclosed. One type of biomass reactor system comprises a plurality of biomass processing stations configured in series, each station comprising an auger reactor including an auger inlet for receiving biomass and a transfer screw for conveying the biomass through the auger reactor.
1. A method of thermally decomposing biomass in a plurality of pyrolysis stations to generate biofuel and biochar in separate streams comprising:
operating each of the plurality of pyrolysis stations by adjusting temperature and/or pressure, wherein at least one of the temperature and pressure are different between stations;
transferring said biomass and/or subsequent thermal decomposition products into and out of said plurality of pyrolysis stations, the plurality of pyrolysis stations comprising:
a first pyrolysis station is operated under conditions selected to generate a vapor product comprising primarily water and acetic acid and directing the vapor product from the first pyrolysis station to a first location;
at least a second pyrolysis station operated under conditions selected to pyrolyze said biomass or the subsequent thermal decomposition products to produce a second vapor stream suitable for fuel production, and directing said fuel-producing vapor stream without condensing to a second location comprising a catalytic column for conversion to fuel; and
at least a third pyrolysis station operated under conditions selected to pyrolyze said incoming thermal decomposition products to produce a biochar and to provide a third vapor stream, and directing the third vapor stream to a third location different from the first and second locations.
2. The method of claim 1 , wherein one or more stations comprises an auger.
3. The method of claim 1 , that produces at least one solid biochar stream for soil amendment purposes.
4. The method of claim 1 , wherein the first station is preceded by one or more stations for drying of biomass.
5. The method of claim 1 , wherein renewable chemicals are synthesized from the third vapor stream.
6. The method of claim 1 , wherein a temperature within a second station in the plurality of stations is incrementally higher than a temperature within a first station in the plurality of stations, and wherein a temperature within a third station in the plurality of stations is incrementally higher than a temperature within the second station.
7. The method of claim 1 , wherein a pressure in a station is lower than the pressure within the preceding station.
8. The method of claim 2 , wherein an auger can be oriented on a slant of 0° to 85° with respect to horizontal.
9. The method of claim 1 , further comprising filters to remove heavy coke forming or particulate components from the second vapor stream, whereby catalyst coking rates are further decreased.
10. The method of claim 2 , wherein a catalyst is introduced into at least one auger station together with the biomass or its decomposition products.
11. The method of claim 2 , further comprising a heat carrier to provide the thermal energy for thermal decomposition of the biomass selected from the group: heating coils with or surrounding the at least one auger station, electrically heating within or surrounding the at least one auger station, heated particles passing through the at least one auger station, heated ferromagnetic solid particles, heated char particles, heated ash particles, and heated particles with a phase change material internal to the particle.
12. The method of claim 2 , further comprising a heat carrier comprising a hollow particle constructed of a metal or ceramic which comprises a shell and containing an internal material different than the shell such that the internal material can be heated to change phases in a temperature range of 300° C. and 1000° C. and whereby heat can be transferred to pyrolyze the biomass by the appropriate phase change temperature of the internal material.
13. The method of claim 1 , where an oxidizer is provided to a station to promote heating.
14. The method of claim 2 , wherein at least one auger station comprises a transfer screw and the transfer screw is heated by electrical means.
15. The method of claim 11 , wherein the heat carrier for each station is independent.
16. The method of claim 2 , where the stages are contained within in a single auger shell.
17. The method of claim 2 , wherein a first auger station in the plurality of auger stations includes an exit port that terminates in an auger inlet of the second auger station.
18. The method of claim 2 , wherein a last auger station in the plurality of auger stations terminates in an exit port that removes a biochar product of the system.
19. The method of claim 2 , wherein a pressure within an auger station is selectively controllable by restricting the rate that products are withdrawn from the auger station.
20. The method of claim 2 , wherein a pressure within an auger station is selectively controllable by introducing a gas or vapor stream into the auger station.
21. The method of claim 2 , comprising controlling the pressure by continuously varying screw shaft diameter in at least one auger station.
22. The method of claim 2 , wherein the dimensions of each auger station are adjustable to allow more or less residence time for the biomass at each auger station.
23. The method of claim 2 , wherein the temperature of each auger station comprises a linearly varying temperature.
24. The method of claim 1 , wherein a pressure in the third station is higher than the pressure within the second station.
25. The method of claim 1 , further comprising removing heavy coke forming or particulate components using a temperature quench of a vapor stream, whereby catalyst coking rates are further decreased.
26. The method of claim 1 , further comprising removing heavy coke forming or particulate components from a vapor stream using a cyclone, whereby catalyst coking rates are further decreased.