Heating of hydraulic digesters
US-2017260693-A1 · Sep 14, 2017 · US
Heating of hydraulic digesters
US10240287B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10240287-B2 |
| Application number | US-201515509959-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 10, 2015 |
| Priority date | Sep 12, 2014 |
| Publication date | Mar 26, 2019 |
| Grant date | Mar 26, 2019 |
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Abstract
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A method and system for heating a hydraulic digester, such as a single-vessel hydraulic digester, which has a top separator, a level of chips and a liquid phase above the level of chips. The method includes: a. entraining chips in liquor to produce a slurry having a first temperature, b. feeding the slurry of chips to the digester through the top separator, c. supplying direct steam to the liquid phase between the level of chips and the top separator to heat the slurry to a second temperature for the impregnation stage, wherein the steam is fed by using at least one steam injector having a plurality of steam discharge openings; and d. heating the slurry to a third temperature and cooking the chips in a cooking zone, and withdrawing the cooked pulp from the bottom of the digester.
First claim
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The invention claimed is: 1. A method of producing chemical pulp in an impregnation stage and a cooking stage, using a hydraulic digester, having a top separator, a level of chips and a liquid phase above the level of chips, comprising at least the following steps: a. entraining chips in liquor to produce a slurry having a first temperature, b. feeding the slurry of chips to the digester through the top separator, c. supplying the direct steam to a liquid phase between the level of chips and the top separator to heat the slurry to a second temperature for the impregnation stage, wherein the steam is fed by using at least one steam injector having a plurality of steam discharge openings; and d. heating the slurry to a third temperature and cooking the chips in a cooking zone in the hydraulic digester, and withdrawing the cooked pulp from a bottom of the hydraulic digester. 2. The method according to claim 1 , wherein the first temperature is below 110° C. 3. The method according to claim 1 , wherein the second temperature is 1 to 40° C. higher than the first temperature. 4. The method according to claim 1 , wherein the supplying of the direct steam includes feeding the direct steam through steam discharge openings having a diameter in a range of 0.1 to 15 mm to produce small bubbles in the liquid phase of the hydraulic digester. 5. The method of claim 1 wherein the step of supplying the direct steam includes heating the slurry to the second temperature while the slurry is in the liquid phase of the hydraulic digester. 6. The method of claim 1 wherein the at least one steam injector includes a conduit extending through an outer wall of the hydraulic digester and the plurality of steam discharge openings are in the liquid phase of the hydraulic digester.
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- What does patent US10240287B2 cover?
- A method and system for heating a hydraulic digester, such as a single-vessel hydraulic digester, which has a top separator, a level of chips and a liquid phase above the level of chips. The method includes: a. entraining chips in liquor to produce a slurry having a first temperature, b. feeding the slurry of chips to the digester through the top separator, c. supplying direct steam to the liqu…
- Who is the assignee on this patent?
- Andritz Oy
- What technology area does this patent fall under?
- Primary CPC classification D21C7/10. Mapped technology areas include Textiles & Paper.
- When was this patent published?
- Publication date Tue Mar 26 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).