Operation Experience of MVR Pre-Eva

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  • MVRプレエバの操業経験
  • MVR プレエバ ノ ソウギョウ ケイケン

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Abstract

In Chuetsu Pulp, Sendai Mill produces HW pulp with continuous digester line and SW pulp with batch digester line.<br>The weak black liquor dry solids from the continuous digester to main evaporation plant is around 20 DS % with Pre-Evaporator (Pre-Eva) using the flash steam from the digester extraction as heat source.<br>On the other hand, around 13 DS % SW black liquor directly goes to the main evaporator because of no Pre-Eva in the batch digester line.<br>Sendai mill has been increased SW pulp production since 2009. Because of the pulp production increase, the main evaporation plant became overloaded.<br>Pre-Eva with flash steam from continuous digester has been introduced to Japanese mills. In food processing industry, electricity (compressor) has been used to evaporate the product because such steam would not be so available in the food processing mills.<br>Sendai mill has recently introduced vapor recompression pre-evaporation plant to the black liquor from SW batch digester to decrease steam consumption of the main evaporation plant as cost saving.<br>There are no references in Japanese pulp and paper industry for vapor recompression evaporator with compressor which has been introduced to the food processing industry. Chuetsu Pulp decided to introduce Andritz Mechanical Vapor Recompression (MVR) Evaporator for Sendai Mill because Andritz MVR has many references for black liquor pre-evaporation plant all over the world.<br>This paper explains the general description of MVR plant and the operation experience.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 69 (4), 355-359, 2015

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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