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Up & Running articles

Up & Running articles

10 of 164 documents
  • Mar 20, 2018

    Rick's Tips - Checking dryer bearing fit and internal clearance

    After a dryer front bearing has been removed, the bearing fit and new bearing to be installed internal clearance should be inspected. The following procedures cover journal and bearing inspection.

  • Mar 13, 2018

    Recovery boiler SCR - a retrofit case study

    SCR – Selective Catalytic Reduction is a well-established and widely used technology for NOx removal from power boiler flue gases. Target emission levels are decreasing and SCR will soon be needed for recovery boilers. This article is an abstract of a white paper which presents a study for a retrofit case using SCR to lower NOx from 200 to 100 mg/m3 (6% O2, dry gas), including implementation of some high power features.

  • Mar 6, 2018

    Polarized forming fabrics may revolutionize water removal

    The polarized structure allows controlled initial drainage in the paper-making process, improving retention and helping keep the machine clean. The good runnability and cleanliness reduce breaks, increasing production capacity and saving through reduced use of chemicals.

  • Feb 27, 2018

    Field Report - Roll alignment

    Alignment of rollers is critical to keep the web and fabrics running true without wrinkles and tight/baggy lanes. Where the rollers are determines how good the alignment must be.

  • Feb 20, 2018

    Rick's Tips - Unwind stand maintenance

    The unwind is responsible for several functions in the finishing process, including supercalendering, coating, and rewinding paper into a denser, more stable roll. During operation, it endures constant tension, high speed and vibration, which slowly take their toll. So proper maintenance is essential.

  • Feb 13, 2018

    Rick's Tips - Air guide maintenance

    The air guide is common on paper machines, where the machine clothing is a continuous belt. Proper care and maintenance of the air guide is essential to make sure that the guide works evenly and trouble-free.

  • Feb 6, 2018

    Field Report - Vibration in tri-nip press (case study)

    A paper machine experienced vibration in its tri-nip press on the tending side only. Valmet condition monitoring and vibration analysis used synchronous time averaging (STA) to assist in solving the problem.

  • Jan 30, 2018

    Valmet Suction Roll Upgrades

    Valmet offers a comprehensive list of suction roll upgrades to optimize production line performance, water and energy use, product quality, running time and reliability. These upgrade services bring additional benefits through tailored modernizations.

  • Jan 23, 2018

    Rick's Tips - Maintenance of primary and secondary reeling devices

    In order to reliably build a parent roll with good structure for downstream processing, primary and secondary reeling devices must be maintained to guarantee smooth operation. Recommended maintenance and lubrication of a typical reel is presented in this article.

  • Jan 16, 2018

    CFB evolution from coal to biomass

    Circulating fluidized bed (CFB) technology has adapted to market needs over the last thirty years, from high-ash coal to low-calorific-value biomass, and from petcoke with a high sulfur content to waste fuel with a high chlorine content. CFB technology has proven its capability to adapt to changing technical requirements.

Up & Running articles

10 of 164 documents