Solid-liquid separation device and method for washing lignocellulosic solid residue

Patent metadata

Field	Value
Publication number	US-11242433-B2
Application number	US-201816476558-A
Country	US
Kind code	B2
Filing date	Nov 21, 2018
Priority date	Jun 26, 2018
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

A solid-liquid separation device includes a kettle body, a piston, a stirrer, a separation plate having filtration pores, and a filtration mesh. The kettle body is hollow along an axial direction to form a chamber body. The separation plate is fitly installed in the chamber body, and divides the chamber body into a washing chamber and a draining chamber. The piston and the stirrer are fitly disposed in the washing chamber. The filtration mesh is attached on a side of the separation plate to cover the filtration pores. The kettle body is further provided with a feed inlet, a water inlet, a material outlet, and a liquid outlet. The feed inlet and material outlet are communicated with the washing chamber, and the water inlet and the liquid outlet are communicated with the draining chamber. The method includes the following steps: feeding, solid-liquid separation, washing, and material discharge.

First claim

What is claimed is:

1. A solid-liquid separation device for repeatedly washing a lignocellulosic solid residue, comprising a kettle body, a piston, a stirrer, a separation plate provided with filtration pores, and a filtration mesh; wherein,
the kettle body is hollow along an axial direction of the kettle body to form a chamber body; the separation plate is fitly installed in the chamber body, the chamber body is divided into two sections by the separation plate, and the two sections comprise a washing chamber and a draining chamber; the piston and the stirrer are fitly disposed in the washing chamber; the filtration mesh is attached on a side of the separation plate facing the stirrer, and the filtration pores of the separation plate are covered by the filtration mesh, and wherein the stirrer is a paddle type stirrer where blades of the paddle type stirrer are cylindrical or cuboid;
the kettle body is further provided with a feed inlet, a water inlet, a material outlet, and a liquid outlet; the feed inlet and the material outlet are communicated with the washing chamber, and the water inlet and the liquid outlet are communicated with the draining chamber.

2. The solid-liquid separation device of claim 1 , wherein the feed inlet is positioned higher than the material outlet, and the water inlet is positioned higher than the liquid outlet.

3. The solid-liquid separation device of claim 1 , wherein the kettle body is placed with a slope angle ≤5° to make the liquid outlet positioned at a lowest point.

4. The solid-liquid separation device of claim 1 , wherein the feed inlet, the water inlet, the material outlet and the liquid outlet are provided with ball valves.

5. The solid-liquid separation device of claim 4 , wherein the water inlet is further provided with a flow meter.

6. The solid-liquid separation device of claim 4 , wherein the feed inlet is 10 to 20 mm away from a starting position of the piston, and the material outlet is positioned directly below the stirrer.

7. The solid-liquid separation device of claim 4 , wherein caliber sizes of the feed inlet and the material outlet are larger than caliber sizes of the water inlet and the liquid outlet; a diameter of the filtration pores is 10 to 20 mm, and a mesh diameter of the filtration mesh is smaller than a material diameter.

8. The solid-liquid separation device of claim 1 , wherein the kettle body is further provided with a window for observing an inside of the chamber body.

9. A method for repeatedly washing a lignocellulosic solid residue by employing the solid-liquid separation device of claim 1 , comprising:
S1: feeding
feeding a pretreated lignocellulosic slurry into the washing chamber of the kettle body through the feed inlet;
S2: solid-liquid separation
pushing the piston towards the stirrer to squeeze the pretreated lignocellulose slurry and thereby a liquid contained in the slurry flows into the draining chamber through the filtration mesh and the filtration pores; opening the liquid outlet to discharge the liquid; the lignocellulosic solid residue is trapped in the washing chamber, and the liquid in the lignocellulosic solid residue is squeezed out as the piston is moving onto achieve the solid-liquid separation;
S3: washing
after the solid-liquid separation, pulling the piston back to the starting position, and closing the liquid outlet; switching on the stirrer to break up the lignocellulosic solid residue, and then switching off the stirrer; opening the water inlet to allow sufficient water into the chamber body at a liquid-solid ratio of 6:1 to 10:1, and then closing the water inlet; switching on the stirrer to stir at 100 to 300 rpm for 5 to 10 minutes, and then switching off the stirrer; performing the solid-liquid separation according to the step S2; repeating the steps S2 and S3 to repeatedly wash the lignocellulosic solid residue in the kettle body;
S4: material discharge
after the steps of washing and solid-liquid separation, pulling the piston back for 10 to 50 mm; switching on the stirrer to break up the lignocellulosic solid residue, and then switching off the stirrer; opening the material outlet, and pushing the piston towards the material outlet to convey the lignocellulosic solid residue to a subsequent reaction kettle through the material outlet; after a material discharge is completed, closing the material outlet, and pulling the piston back to the starting position, to prepare for washing a next batch of material.

10. The solid-liquid separation device of claim 1 , wherein the kettle body is placed with a slope angle ≤5° to make the liquid outlet positioned at a lowest point.

11. The solid-liquid separation device of claim 2 , wherein the feed inlet, the water inlet, the material outlet and the liquid outlet are provided with ball valves.

Assignees

• Guangzhou Inst Energy Conversion Cas
• Guangzhou Inst Of Energy Conversion Academy Of Sciences

Inventors

• Wang Wen
• Zhuang Xinshu
• Tan Xuesong
• Wang Qiong
• Yu Qiang
• Qi Wei
• Wang Zhongming

Classifications

• C08H8/00 Primary

  Macromolecular compounds derived from lignocellulosic materials {(pretreatment thereof B27N)} · CPC title

• B01D33/76

  for discharging the filter cake, e.g. chutes · CPC title

• C08L97/02

  Lignocellulosic material, e.g. wood, straw or bagasse {(manufacture of articles made from lignocellulosic material by dry processes B27N)} · CPC title

• C02F11/122

  using filter presses (C02F11/123 takes precedence) · CPC title

• B01D33/015 Primary

  with flat filtering elements · CPC title