TH10983B - Process for continuous pulp boiling - Google Patents

Abstract

The invention involves boiling the fibrous material under high pressure and temperature in Continuous set (1) sub-pot Which transmits fibrous materials And liquids used For boiling onto the top of the digester, carry the used boiling liquid. Exit at least one of the surrounding filters (IDs). Between the top and bottom of the sub-pot And the fibrous material is diverted (IC) of the sub-pot, by installing an additional ambient filter (2) on the existing substrate (I) over the lowest ambient filter (IB) of the A sub-pot to be able to maintain the temperature in all parts of the brewing area where the precipitation (participatory cooking zone.,) in the sub-pot to keep most of them at the same level.

Claims (8)

1. Method for continuous boiling of fibrous materials under high pressure and temperature in a stand-up sub-pot (1) feeding fibrous materials and liquids at the top of the digester conducts the liquid used for boiling. Used Leave at least one set of filters surrounding the sub-pot (1D) between the top and bottom of the substrate. The fibrous material is removed from the bottom of the sub-pot (1C), the rinse liquid (4) is fed through the bottom of the digester (1A). The liquid is removed from the strainer surrounding the bottom substrate (1B), after which Heated through the first heat exchanger (6A), then the liquid by The first central tube (5A) is discharged at the same level as the filter surrounding the bottom substrate (1B), and where the sub-chamber (1) contains a filter surrounding the upper substrate (2). ) Is in between the filter Around the lower substrate (1B) and the filter surrounding the used liquid (1D) substrate (1D), where the filter surrounding the upper digester (2) carries the liquid through the exchanger. The second heat (6B) is released and the second central tube (5B) is released immediately above the filter surrounding the top sub-chamber (2) and the sub-chamber consists of at least one supplied pipe. (1F or 1G) for the addition of boiling liquids in connection with a strainer surrounding one such substrate (1B or 2), characterized to be boiled at constant temperature. Where the filter surrounding the top sub-pot (2) is positioned so that its bottom is less than 5 m from the top of the filter surrounding the bottom substrate (1B. ) As there will be circulation and distribution. Effective temperature in the lower part of the sub-pot And where the liquid released from the central tube (5A, 5B) is heated to a temperature that can maintain the temperature in the boiling area. Next to the filter surrounding the upper sub-pot (2) at the same temperature as the working area. The remaining boil or the entire boiling area of the sub-pot is essential. 2. The method according to claim 1, is characterized by the filter surrounding the upper sub-pot (2), consisting of several circular or elliptical (2A) filtration units designed to carry liquids that are Replaced for feeding through the central tube (5B). 3. The approach to claim 1 is characterized by specific distances between the top fringes of the surrounding filter. The bottom substrate (1B) and the bottom strainer surrounding the upper substrate (2) are less than 2 m and should be chosen under 1 m. 4. The method according to claim 1, is characterized in that the temperature of the upward-flowing materials, fibers and liquids positioned above the top edge of the filter surrounding the upper sub-pot (2A) differs from the temperature of The remaining boiling area or the entire boiling area at most is 4 cu., Preferably 2 c., The most preferable is 1 cu. 5. The method according to claim 1, is characterized in that the sub-boiler consists of at least one of the supplied tubes (1F or 1G). Two (1F, 1G) should be chosen for filling the liquid used for boiling at link Connected to a filter surrounding one of the sub-pots (1B or 2) 6. Method according to claim 1, there is a specification where the strainer surrounding the upper sub-chamber (2) is re-installed to the shell of the existing substrate. 7. The method according to claim 2, is specific in which the aforementioned central tube (5B) releases fluid. Above, next to the filter surrounding the upper sub-pot (2) 8. The method according to claim 2 or 7 is specific, where the said center pipe (5B) is re-installed to the existing substrate (1).