skip to main content
Language:
Search Limited to: Search Limited to: Resource type Show Results with: Show Results with: Search type Index

Energy costs : Where does your mill stand, and what can you do about it?

Pulp & Paper Canada, 2006-02, Vol.107 (2), p.11

2008 INIST-CNRS ;Copyright Southam Business Communications, Inc. Feb 2006 ;ISSN: 0316-4004 ;EISSN: 1923-3515 ;CODEN: PPCADD

Full text available

Citations Cited by
  • Title:
    Energy costs : Where does your mill stand, and what can you do about it?
  • Author: BROWNE, Tom ; FRANCIS, Bill ; TOWERS, Mike
  • Subjects: Applied sciences ; Benchmarks ; Cost control ; Energy consumption ; Energy efficiency ; Exact sciences and technology ; Paper and paperboard manufacturing ; Paper, paperboard, non wovens ; Polymer industry, paints, wood ; Pulp & paper industry ; Pulp manufacturing ; Wood. Paper. Non wovens
  • Is Part Of: Pulp & Paper Canada, 2006-02, Vol.107 (2), p.11
  • Description: The data set, presented to industry representatives during a roundtable session in Ottawa on June 16, 2005 (see sidebar #2), is extensive, and space prevents discussing more than an illustrative sample here. Figure 1 illustrates the range of thermal energy use, defined as steam used less condensate returned, in batch-type kraft pulping digesters. The range is from about 3 to over 9 GJ/ODt; depending on fuel prices, the value of 1 GJ of steam may be as high as $12. The theoretical value for a modern mill using conventional batch digesters is about 3.5 GJ/ODt; the best batch digesters appear to be operating at the level of best available technology. Figure 2 shows thermal energy use in kraft continuous digesters. The range is from 1.5 to about 7 GJ/ODt, while the theoretical modern mill consumes 2.2 GJ/ODt. Different process boundary definitions explain the difference between the modern mill and Mill 1; nonetheless, the best mills again appear to be close to best available technology. Compared with Figure 1, it is also clear that while batch digesters are generally less efficient than continuous digesters, the best batch digesters are significantly better than the worst continuous digesters. In mechanical pulping, electrical energy is used to convert wood to pulp. The thermo-mechanical pulping process (TMP), in particular, consumes large amounts of electricity, but has the ability to generate large amounts of excess steam for use elsewhere in the mill. Figure 3 shows the net steam generation from newsprint TMP plants across Canada. The best mills are generating up to 3.5 GJ/ODt of clean steam in the TMP plant for use in papermaking and elsewhere; the worst are consuming as much as 3 GJ/ODt of boilergenerated steam. The modern mill should be able to generate 5 GJ/ODt in the case of newsprint, and more in the case of a value-added grade such as light-weight coated (LWC) or supercalendered (SC) papers.
  • Publisher: Don Mills, ON: Southam
  • Language: English
  • Identifier: ISSN: 0316-4004
    EISSN: 1923-3515
    CODEN: PPCADD
  • Source: AUTh Library subscriptions: ProQuest Central
Back to results list
INSPIRE LIBRARY - TON DUC THANG UNIVERSITY (84-028) 37 755 057 Feedback
19 Nguyen Huu Tho St. Dist.7, HCM thuvien@tdtu.edu.vn

Copyright © 2017 INSPIRE LIBRARY - TON DUC THANG UNIVERSITY

Searching Remote Databases, Please Wait