Digester system containing a single vessel serving as all of a chip bin, steaming vessel, and chip chute
US5635025A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 1994 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Dec 5, 2014 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C7/12
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In a continuous digester system the chip feed equipment is greatly simplified by substituting a single vertical vessel for the conventional chip bin, steaming vessel and chip chute. An outlet at the bottom of the single vessel is connected, through a low pressure pump, to the low pressure input of a high pressure transfer device which is connected to a digester (either directly or through an impregnation vessel). A metering device, preferably through a pressure isolation device for maintaining superatmospheric pressure in the vessel, feeds chips into the top of the vessel. A first level, of chips, is established in the vessel and a second, liquid, level below the first level is also established. Steam is supplied to a volume between the top of the vessel and the second level utilizing a conduit with an automatically controlled valve and a temperature controller for at least partially controlling the valve. A level controller controls the supply of liquid to the vessel and is connected to the low pressure outlet from the high pressure transfer device. There is a reduction in cross-sectional area of the vessel of greater than 50% between the second level and the outlet at the bottom …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.