Biomass conditioning system and method for conditioning

• US 8,757,388 B2
• Filed: 02/02/2010
• Issued: 06/24/2014
• Est. Priority Date: 02/02/2010
• Status: Active Grant

• Current Assignee: Weyerhaeuser NR Company (Weyerhauser)
• Original Assignee: Weyerhaeuser NR Company (Weyerhauser)
• Inventors: Leist, James R.
• Primary Examiner(s): Karmis, Stefanos
• Assistant Examiner(s): Butler, Michael E
• Application Number:
  US12/698,315
• Publication Number:
  US 20110186481A1
• Time in Patent Office: 1,603 Days
• Field of Search: 209/163, 209/3.1
• US Class Current: 209/163
• CPC Class Codes: B03B 11/00 Feed or discharge devices integral with washing or wet-separating equipment
• CPC Class Codes: B03B 5/40 of trough type
• CPC Class Codes: C10L 5/442 Wood or forestry waste
• CPC Class Codes: F23K 1/00 Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
• CPC Class Codes: Y02E 50/10 Biofuels, e.g. bio-diesel
• CPC Class Codes: Y02E 50/30 Fuel from waste, e.g. synthetic alcohol or diesel

Abstract

The disclosure is directed generally a biomass conditioning system and methods for conditioning biomass to remove undesirable material for further processing and applications. In some embodiments, the disclosure includes a biomass conditioning system including a conditioning tank, a water input device, a biomass input device, a containment device, a spillway, and a moving separation device. In some embodiments, methods according to the disclosure include pumping water into a conditioning tank, depositing biomass into the conditioning tank, allowing the biomass to soak in the water and separate into a bark portion and a non-bark portion, allowing the bark portion to float to a water line, containing the bark portion to one side of the conditioning tank, moving the bark portion into a bark storage area, separating the non-bark portion into a biomass portion and a debris portion, and moving the conditioned biomass portion into a storage area.

Claims

1. A biomass conditioning system comprising:

a conditioning tank having a bottom portion and a wall portion;

a water input device configured to fill the conditioning tank with water to a water line;

a biomass input device configured to deposit biomass into the conditioning tank and immerse the biomass in the water, thereby causing the biomass to separate into a floating portion and a nonfloating portion, the nonfloating portion comprising nonfloating biomass and debris;

a containment device configured to;

divide the conditioning tank into a first side and a second side; and

contain the floating portion of the biomass in the first side of the conditioning tank;

a spillway located on the first side of the conditioning tank, the spillway being configured to transfer the floating portion of the biomass to a first storage area; and

a moving separation device at least partially submerged in the water, the moving separation device being configured to permit passage of the debris and to transport the nonfloating biomass out of the second side of the conditioning tank and into a second storage area.

2. The biomass conditioning system of claim 1, further comprising a suction filter configured to pull the non-floating portion of the biomass toward the bottom portion of the conditioning tank and to remove the debris from the conditioning tank.

3. The biomass conditioning system of claim 1 wherein the floating portion of the biomass comprises bark.

4. The biomass conditioning system of claim 1, further comprising a surfactant dispensing device configured to dispense a surfactant into the conditioning tank, the surfactant being effective to reduce surface tension of the water.

5. The biomass conditioning system of claim 1 wherein the moving separation device comprises a conveyor having a plurality of openings, the plurality of openings being sized to be larger than the debris and smaller than the nonfloating biomass.

6. The biomass conditioning system of claim 1 wherein the moving separation device comprises:

a first portion below the water line; and

a second portion above the water line, the second portion being located on the second side of the conditioning tank.

7. The biomass conditioning system of claim 6 wherein the first portion of the moving separation device comprises:

a horizontal section that is arranged substantially parallel to the bottom portion of the conditioning tank; and

an angled section that is at least partially submerged in the water.

8. The biomass conditioning system of claim 7 wherein the horizontal section is configured to vibrate or shake.

9. The biomass conditioning system of claim 1 wherein the containment device comprises a floating divider having one or more agitators, the one or more agitators configured to rotate, vibrate, or shake.

10. A biomass conditioning system comprising:

a conditioning tank having a bottom portion and a wall portion;

a water input device configured to fill the conditioning tank with water to a water line;

a biomass input device configured to deposit biomass into the conditioning tank, the biomass including a bark portion, a conditioned biomass portion, and a debris portion;

a floating divider which divides the conditioning tank into a first side and a second side, the bark portion of the biomass being contained in the first side of the conditioning tank;

a spillway located on the first side of the conditioning tank, the spillway being configured to transfer the bark portion of the biomass to a bark storage area;

a conveyor comprising;

a first portion below the water line; and

a second portion above the water line, the second portion being located on the second side of the conditioning tank;

wherein the first portion of the conveyor and the second portion of the conveyor each have a plurality of openings, the plurality of openings being sized to permit the debris portion of the biomass to pass through the conveyor and sink to the bottom of the conditioning tank; and

a suction filter located on the bottom portion of the conditioning tank.

11. The biomass conditioning system of claim 10, further comprising a surfactant dispensing device configured to dispense a surfactant into the conditioning tank, the surfactant being effective to reduce surface tension of the water.

12. The biomass conditioning system of claim 10 wherein one or more rotary paddles are attached to the floating divider, the one or more rotary paddles being configured to rotate toward the second side of the conditioning tank.

13. The biomass conditioning system of claim 10 wherein the wall portion comprises a first wall, a second wall, a third wall, and a fourth wall, the first wall being substantially parallel to the third wall, and the second wall being substantially parallel to the fourth wall.

14. The biomass conditioning system of claim 13 wherein:

the biomass input device is located on the first wall;

the floating divider extends from the first wall to the third wall;

the spillway is located on the third wall; and

the conveyor extends from the first wall to the third wall and at least a portion of the conveyor is in a slanted configuration with respect to the bottom portion of the conditioning tank.

15. The biomass conditioning system of claim 13 wherein:

the biomass input device is located on the first wall;

the floating divider extends from the second wall to the fourth wall;

the spillway is located on the fourth wall; and

the conveyor extends from the second wall to the fourth wall and at least a portion of the conveyor is in a slanted configuration with respect to the bottom portion of the conditioning tank.