Method and assembly for processing cellulose pulp of wood processing industry
a technology of wood processing industry and cellulose pulp, which is applied in pulp liquor regeneration, papermaking, digesters, etc., can solve the problems of cumbersome processing, large tanks and expensive chemicals, and ineffective soap separation methods, etc., and achieves the effect of reducing the volume of soap, and reducing the cost of soap separation
Inactive Publication Date: 2016-02-11
ANDRIZ OY
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Benefits of technology
This patent describes a new and efficient method for separating soap from other liquids using hydrocyclones or other pressurized separation apparatus. This method is affordable and simple, in contrast to previous methods that were expensive and prone to malfunctions. The advantage of using pressure is that it allows for working at temperatures of over 100 °C, and the gas and steam bubbles in soap are compressed when pressure rises, resulting in a smaller volume of soap. The method is suitable for both hydrocyclones and other pressurized separation apparatus such as pressurized filtrate tanks or centrifuges. Overall, this invention provides a better and more efficient way to separate soap from other liquids.
Problems solved by technology
The aforementioned soap separation methods are expensive, ineffective and susceptible to malfunctions.
For soap separation, large tanks and expensive chemicals are needed.
Even if one is able to separate foam by overflow, its processing is cumbersome due to the large volume.
Method used
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[0018]In FIG. 1, a prior art connection between a continuous digester and a pressure diffuser is represented. The pulp flowing from a continuous digester 1 is led into a pressure diffuser 2. The pulp 4 is washed in the pressure diffuser at a pressure of 3 to 6 bar by displacing washing water of a higher purity through a pulp annulus. Most of the liquid from the digester is displaced as a filtrate 7 and most of the washing water is carried on with the washed pulp 5 to the next stage. The removal of filtrate to a non-pressurized filtrate tank 3 is controlled using flow measurement and an adjustable valve 10. In the filtrate tank 3, air and soap possibly trapped in the filtrate are allowed to separate from the filtrate. Air exits through gassing off / gas separation 11, however, soap does not usually exit but it enriches in the filtrate tank 3 until a balance level is achieved. Filtrate 8 is pumped from the filtrate tank 3, part of the filtrate goes to the bottom of the digester 1 where ...
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Abstract
A method of and an apparatus for processing cellulose pulp of wood processing industry. The method and assembly may be used, on one hand, as a pressure diffuser for washing the pulp before an oxygen stage and, on the other hand, the separation of soap, gas and / or other light materials from filtrates and from black liquor of a cellulose mill in a pressurized device, as well as the new process connections enabled by the method. The method and apparatus may process filtrates from brown stock washing and bleaching as well as black liquors from a digesting department and an evaporation plant. By way of example, the filtrate of the washing department is pumped to the digesting department of a sulfate cellulose mill as well as the black liquor taken from the digesting department to an evaporation plant.
Description
RELATED APPLICATIONS[0001]This application is a continuation of U.S. application Ser. No. 13 / 393,785 (U.S. Pat. No. 9,163,358) filed Apr. 18, 2012, which is a U.S. national phase application of International Application No. PCT / FI2010 / 050675, filed Aug. 31, 2010, which designated the U.S. and claims priority to Finnish application 20090313 filed Sep. 1, 2009, the entire contents of each of these applications are incorporated by reference.BACKGROUND[0002]A method and an assembly is disclosed herein for processing cellulose pulp of wood processing industry. Especially, the disclosed method and assembly may be used, on the one hand, as a pressure diffuser for washing the pulp before an oxygen stage and, on the other hand, for the separation of soap, gas and / or other light materials from filtrates and black liquor of a cellulose mill in a pressurized device, as well as the process connections enabled by the method. The disclosed method and assembly are suitable for processing filtrates ...
Claims
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IPC IPC(8): D21C11/00D21C7/00D21C9/02D21C9/10
CPCD21C11/0007D21C9/02D21C9/10D21C7/00D21C9/04D21C9/08D21C9/147D21C11/00D21C11/0028
Inventor KETTUNEN, AUVO
Owner ANDRIZ OY