Method to use heat energy from black liquor
US8545674B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 2007 |
| Grant date | Oct 1, 2013 |
| Priority date | — |
| Expiry date | Dec 20, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The method is for retrieving heat from black liquor wherein the black liquor is withdrawn from a digester in association with the production of cellulose pulp. The black liquor at the withdrawal stage maintains a first withdrawal temperature. At least a part of the black liquor is led to a heat exchanger. An exchange of heat takes place in the heat exchanger between the black liquor and a bleaching filtrate that has been obtained from the bleaching plant. The exchange of heat results in the bleaching filtrate experiencing a raise in temperature of at least 5° C., after which the heated bleaching filtrate is used in the bleaching plant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.