Biomass apparatus and method with pre-treatment and reflux condenser
A method of drying a moisture-containing or water-laden biomass material is provided that includes the steps of sending the biomass material into an apparatus having a feeding device, a rotary biomass dryer, a reflux condenser, an aftercooler, and an exit mechanism. The biomass material may be pretreated, and then heated in order to separate the moisture-containing or water laden biomass material into steam and dry biomass material. The steam is removed as the steam and the dry biomass material passes through the reflux condenser, the dry biomass is cooled in the aftercooler stage, and the dry biomass material is collected after exiting the apparatus through the exit mechanism.
1. A method of drying a moisture-containing biomass material, the method comprising:
using an apparatus comprising:
a feeding device;
a rotary biomass dryer;
a reflux condenser;
an aftercooler; and
an exit mechanism;
feeding the moisture-containing biomass material into the feeding device;
pretreating the biomass material;
heating the moisture-containing biomass material in the rotary biomass dryer to separate the moisture-containing biomass material into steam and dry biomass material at a temperature at or below 350° F.;
removing the steam from the apparatus as the steam and the dry biomass material passes through the reflux condenser;
cooling the dry biomass material in the aftercooler; and
collecting the dry biomass material after exiting the apparatus through the exit mechanism.
2. The method according to claim 1 , wherein the pretreating includes at least one of in-situ acid and basic treatment.
3. The method according to claim 2 , wherein the in-situ acid treatment utilizes at least one of acetic acid and citric acid.
4. The method according to claim 2 , wherein the pretreating further comprises inorganic sequestering through the use of one or more sequestering agents.
5. The method according to claim 1 , wherein a pretreatment is injected into the barrel of the rotary biomass dryer immediately after the feeding device.
6. The method according to claim 1 , wherein a rate at which the moisture-containing biomass material is provided to the feeding device is uniform.
7. The method according to claim 1 further comprising mixing more than one moisture-containing biomass material together at a time of or prior to entering the apparatus through the feeding device.
8. The method according to claim 1 further comprising a step of compacting the biomass materials exiting the apparatus.
9. An apparatus for drying a moisture-containing biomass material, the apparatus comprising:
a feeding device;
a rotary biomass dryer operating at a temperature at or below 350° F. such that the biomass material does not become biochar;
a reflux condenser;
an aftercooler stage; and
an exit mechanism.
10. The apparatus according to claim 9 , wherein the feeding device is selected from the group of a crammer feeder, an in-feed mixer, a preheater, and a dual-belt feeder.
11. The apparatus according to claim 9 , wherein the feeding device is a crammer feeder having a funnel configuration.
12. The apparatus according to claim 10 , wherein the feeding device is a dual-belt feeder comprising a top belt that levels an inflow of moisture-containing or water-laden biomass material by raking, and further comprising a lower belt that provides metered feed provisions to the rotary biomass dryer.
13. The apparatus according to any of claim 9 , wherein the rotary biomass dryer comprises a screw system selected from the group consisting of multiple screws and a fixed screw with a rotating barrel.
14. The apparatus according to claim 9 , wherein the rotary biomass dryer includes a screw with a compression zone having a blind aperture open to a drive end, wherein a hollow device is used to deliver cooling fluid to an opposite end of the blind aperture.
15. The apparatus according to claim 14 , wherein the blind aperture is proximate a compression zone end of the screw.
16. The apparatus according to claim 15 further comprising a liquid filter.
17. The apparatus of according to claim 1 , wherein the apparatus further comprises a mixer located upstream of the feeding device.
18. The apparatus according to claim 1 further comprising an auto acid hydrolysis zone, a hydrolysis zone, a steam explosion zone, a recapture carbonization zone, and a cooling condensation zone.