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fiber accelerator: a new device for energy recovery in TMP and CTMP plants

Pulp & paper Canada, 2004-02, Vol.105 (2), p.24-27

2004 INIST-CNRS ;Copyright Southam Business Communications, Inc. Feb 2004 ;ISSN: 0316-4004 ;EISSN: 1923-3515 ;CODEN: PPCADD

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  • Title:
    fiber accelerator: a new device for energy recovery in TMP and CTMP plants
  • Author: Ryrberg, K.G ; Obitz, L ; Englund, R
  • Subjects: Applied sciences ; Designs plans etc ; Equipment & supplies ; Exact sciences and technology ; Heat recovery systems ; Industrial equipment ; Paper, paperboard, non wovens ; Polymer industry, paints, wood ; Power supply conservation etc ; Pulp & paper mills ; pulp fiber ; Pulp manufacturing ; thermomechanical pulping ; wood pulp ; Wood. Paper. Non wovens
  • Is Part Of: Pulp & paper Canada, 2004-02, Vol.105 (2), p.24-27
  • Description: All of these problems are well documented, suggesting that there is a strong requirement for an improved device for separating fibre and steam to resolve the problems associated with this important phase of TMP operation. This paper describes a new device, the so called Fibre Accelerator, which has been designed to replace the less efficient pressure cyclones in use in TMP and CTMP plants and reduce fibre carry-over to the heat-recovery system or to the atmosphere. The flow diagram shown in Fig. 1 indicates a typical two-stage TMP system with Fiber Accelerators installed to separate fibre from the contaminated steam going to the heat-recovery unit. An additional observation from these trials was the ease of operation of the unit. Prior to the installation of the Fiber Accelerator, the operation of the pressure cyclone had been rather sensitive, especially during start-up, and great care had to be taken to avoid fibre plugging and other disturbances. During operation with the prototype Accelerator, there were no such problems, even when attempts were made by operators to provoke the system. The normal practice with pressure cyclones is to start up the system with the steam discharge connected to a scrubber or to the atmosphere, and convert over to energy recovery once stable operation has been attained. The Fiber Accelerator allows the system to be started up directly connected to the energy recovery, without any risk of fouling. The three lower sections shown in this figure deal with the savings achieved by using a Fiber Accelerator instead of the pressure cyclone. The first section shows the energy cost for running the Fiber Accelerator with the specific energy consumption 6 kWh/t pulp. The middle section demonstrates the energy gain by avoiding dilution, the gain from steam generated by the energy input in the Fiber Accelerator and the gain from wood cost due to reduced fibre losses with the Fiber Accelerator.
  • Publisher: Don Mills, ON: Southam
  • Language: English
  • Identifier: ISSN: 0316-4004
    EISSN: 1923-3515
    CODEN: PPCADD
  • Source: AUTh Library subscriptions: ProQuest Central
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