How to use TDS measurements to evaluate the performance of diffuser washers-mill study

Riku Kopra, Anna Pesonen, Jari Kayhko, Olli Dahl

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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Abstract

Various types of pulp washing equipment are available. Each washing device has a unique mechanical construction, and the washing principle is often a combination of dilution thickening and displacement washing. In this work, the performance of the pressure diffuser, the washing operation of which is based on liquor displacement, is studied. Diffuser washing occurs normally at a medium consistency (10-12%). In the stepwise trials, the effect of the feed and discharge consistencies on the performance of diffuser was studied. The effect of the downward velocity of the screen on the pressure diffuser's washing efficiency was also studied. The measurement of total dissolved solids (TDS) by a process refractometer was used as the wash loss measurement unit and the refractometer's results were used in the E-value calculations. The COD and conductivity were also measured and their results compared to the TDS results. The results indicated that feed consistency has a significant effect on the performance and effectiveness of the diffusers in the experimental mill. It can also be stated that when the downward velocity of the screen is adjusted to too high a level, the washing efficiency of the pressure diffuser weakens. As a conclusion from the mill test, it can be stated that even small process parameter changes can provide enhanced diffuser washing at the beginning of the washing line, and this has a direct effect on the performance of the post-oxygen washing.

Original languageEnglish
Title of host publicationPulping Engineering and Environmental Recycling Sustainability Conference, PEERS 2018
Subtitle of host publicationTechnical Solutions for Today and Beyond
PublisherTAPPI Press
Pages132-139
Number of pages8
ISBN (Electronic)9781510874695
Publication statusPublished - 1 Jan 2018
MoE publication typeA4 Article in a conference publication
EventPulping Engineering and Environmental Recycling Sustainability Conference - Portland, United States
Duration: 28 Oct 201831 Oct 2018

Conference

ConferencePulping Engineering and Environmental Recycling Sustainability Conference
Abbreviated titlePEERS
Country/TerritoryUnited States
CityPortland
Period28/10/201831/10/2018

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