CA2455172A1 - Feeding comminuted fibrous material using high pressure screw and centrifugal pumps - Google Patents
Feeding comminuted fibrous material using high pressure screw and centrifugal pumps Download PDFInfo
- Publication number
- CA2455172A1 CA2455172A1 CA002455172A CA2455172A CA2455172A1 CA 2455172 A1 CA2455172 A1 CA 2455172A1 CA 002455172 A CA002455172 A CA 002455172A CA 2455172 A CA2455172 A CA 2455172A CA 2455172 A1 CA2455172 A1 CA 2455172A1
- Authority
- CA
- Canada
- Prior art keywords
- pump
- inlet
- recited
- screw pump
- slurry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002657 fibrous material Substances 0.000 title claims abstract 3
- 239000002002 slurry Substances 0.000 claims abstract 13
- 238000010025 steaming Methods 0.000 claims 6
- 229920002678 cellulose Polymers 0.000 claims 4
- 239000001913 cellulose Substances 0.000 claims 4
- 239000003638 chemical reducing agent Substances 0.000 claims 3
- 239000007788 liquid Substances 0.000 claims 3
- 239000000463 material Substances 0.000 claims 3
- 238000005086 pumping Methods 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract 1
- 239000002023 wood Substances 0.000 abstract 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C7/00—Digesters
- D21C7/06—Feeding devices
Landscapes
- Paper (AREA)
Abstract
A system and method for feeding comminuted cellulosic fibrous material such as wood chips to the top of a treatment vessel such as a continuous digester provide enhanced simplicity, operability, and maintainability by eliminating the high pressure transfer device conventionally used in the prior art. Instead of a high pressure transfer device the steamed and slurried chips are pressurized using a single vane slurry pump in series with a centrifugal slurry pump both of which are located at least thirty feet below the top of the treatment vessel and for pressurizing the slurry to a pressure of at least about 10 bar gauge.
Claims (12)
1. A system for producing chemical cellulose pulp from comminuted fibrous cellulose material, comprising:
a steaming vessel in which comminuted fibrous cellulose material is steamed to remove the air therefrom;
a superatmospheric pressure vertical treatment vessel having an inlet for a slurry of comminuted cellulose fibrous material at a top portion thereof and an outlet at a bottom portion thereof; and a plurality of high pressure slurry pumps located below said top portion of said treatment vessel for pressurizing a slurry of material from the steaming vessel and transferring it to said treatment vessel inlet, said plurality of high pressure slurry pumps includes a first screw pump and at least a second pump.
a steaming vessel in which comminuted fibrous cellulose material is steamed to remove the air therefrom;
a superatmospheric pressure vertical treatment vessel having an inlet for a slurry of comminuted cellulose fibrous material at a top portion thereof and an outlet at a bottom portion thereof; and a plurality of high pressure slurry pumps located below said top portion of said treatment vessel for pressurizing a slurry of material from the steaming vessel and transferring it to said treatment vessel inlet, said plurality of high pressure slurry pumps includes a first screw pump and at least a second pump.
2. A system as recited in claim 1 wherein said first screw pump and said second pump are connected in series, and inlet to said first screw pump having an inlet operatively connected to said steaming vessel, and an outlet of said first screw pump operatively connected to an inlet of said second pump.
3. A system as recited in claim 1 wherein said second pump is a high pressure centrifugal slurry pump capable of pumping a slurry have a liquid-to-solid ratio of between 2 and 10.
4. A system as recited in claim 1 further comprising a liquid return line from said top portion of said treatment vessel, said return line operatively connected to an inlet or outlet of one of said slurry pumps.
5. A system as recited in claim 4 wherein said liquid return line is connected to a pressure reducer in said return line and upstream of said inlet or outlet of one of said slurry pumps.
6. A system as recited in claim 5 wherein said pressure reducers comprises a flash tank, and wherein liquid from said flash tank is directed to said inlet to said first screw pump.
7. A system as recited in claim 5 wherein said pressure reducer comprises a pressure control valve in said return line.
8. A system as recited in claim 1 further comprising an eductor operatively connected to an inlet or outlet of one of said slurry pumps.
9. A system as recited in claim 1 wherein said first screw pump and said second pump are connected in series, and inlet to said first screw pump having an inlet operatively connected to said steaming vessel, and an outlet of said first screw pump operatively connected to an inlet of said second pump, wherein said second pump is a high pressure centrifugal pump and said second pump having a higher pressure rating than said first pump; and wherein said treatment vessel comprises a continuous digester.
10. A system as recited in claim 1 wherein said first screw pump is at least thirty feet below a top of said steaming vessel.
11. A system as recited in claim 1 wherein said first screw pump is at least thirty feet below said top section of said steaming vessel.
12. A system as recited in claim 1 wherein said first screw pump is at least thirty feet below said plurality of high pressure slurry pumps
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/354,179 US6841042B2 (en) | 1996-10-25 | 2003-01-30 | Feeding comminuted fibrous material using high pressure screw and centrifugal pumps |
| US10/354,179 | 2003-01-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2455172A1 true CA2455172A1 (en) | 2004-07-30 |
| CA2455172C CA2455172C (en) | 2010-02-23 |
Family
ID=31715590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2455172A Expired - Lifetime CA2455172C (en) | 2003-01-30 | 2004-01-14 | Feeding comminuted fibrous material using high pressure screw and centrifugal pumps |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2004232184A (en) |
| CA (1) | CA2455172C (en) |
| SE (1) | SE0400169L (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE0600309L (en) * | 2006-02-10 | 2006-11-14 | Kvaerner Pulping Tech | Process for impregnating wood chips in a continuous cookery system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3564300D1 (en) * | 1984-04-02 | 1988-09-15 | Kamyr Inc | Sawdust pumping, and processing |
| US5476572A (en) * | 1994-06-16 | 1995-12-19 | Kamyr, Inc. | Chip feeding for a continuous digester |
| US5622598A (en) * | 1995-04-25 | 1997-04-22 | Ahlstrom Machinery Inc. | Chip pumping to a digester |
| US5753075A (en) * | 1996-10-25 | 1998-05-19 | Stromberg; C. Bertil | Method and system for feeding comminuted fibrous material |
| CA2266987C (en) * | 1998-04-21 | 2004-02-10 | C. Bertil Stromberg | Method and system for feeding comminuted fibrous material |
| FI20010854A (en) * | 2000-05-11 | 2001-11-12 | Andritz Ahlstrom Inc | Process for treating cellulosic material |
| FI20010851A (en) * | 2000-05-11 | 2001-11-12 | Andritz Ahlstrom Inc | Arrangement and method for feeding cellulosic material |
-
2004
- 2004-01-14 CA CA2455172A patent/CA2455172C/en not_active Expired - Lifetime
- 2004-01-22 JP JP2004013758A patent/JP2004232184A/en active Pending
- 2004-01-30 SE SE0400169A patent/SE0400169L/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004232184A (en) | 2004-08-19 |
| SE0400169D0 (en) | 2004-01-30 |
| CA2455172C (en) | 2010-02-23 |
| SE0400169L (en) | 2004-07-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20240115 |