Digester system for delivering wood chips in an even layer into a digester
US4238285A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 1978 |
| Grant date | Dec 9, 1980 |
| Priority date | — |
| Expiry date | Oct 11, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J8/003
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A batch type digester for wood chips in which a stream of wood chips is delivered into the center of the top of the digester tank, while liquor is being delivered through a pair of pipes at the top of the tank. Simultaneous with the delivery of the wood chips and liquor, a steam vortex is formed in the upper part of the tank by a plurality of steam jets which are directed downwardly and tangentially and form spiral flow paths below the streams of chips and liquor. The wood chips and liquor are dispersed together and the liquor thoroughly wets the chips. The chips produce a substantially even layer as they fall to the bottom of the tank. The steam vortex maintains a negative relative pressure zone which promotes the dispersion of the stream of chips and the liquor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.