Feeding cellulose material to a treatment vessel
US6447645B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 2001 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Sep 17, 2021 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C7/06
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A feed system for a cellulose pulp treating vessel (such as a continuous digester) is not limited by the required L/W ratio of the pump feeding a wood chip slurry to a high pressure transfer device, the feed system may be kept at a low temperature to minimize flashing of liquid into steam, and a return conduit from the treatment vessel to the transfer device high pressure inlet may be eliminated. Some of the liquid is removed from the slurry just before the low pressure inlet to the transfer device, and/or just after the high pressure outlet, to reduce the L/W ratio of the slurry by at least 0.25, e.g. from 3.0:1 to 2.25:1 just before the low pressure inlet, and from, 7.0:1 to 5.0:1 substantially immediately after the high pressure outlet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.