How to improve process plant uptime.
Daishowa-Marubeni International (DMI) owns and operates the Peace River Pulp Division (PRPD) mill, located in Peace River, Alberta. PRPD produces premium hardwood (aspen) and softwood fully bleached kraft pulp in campaigns. With the Recaust area designed to accommodate a future white liquor pressure filter (WLPF) and the availability of a used pressure filter from an associated mill, the opportunity was taken to complete the design and installation of the filter in order to realize the benefits of increased pulp production through reduction in downtime losses experienced with the existing filter, and reduction in bleach chemical usage and costs.
BUSINESS PROBLEM SOLVED
The swing filter, meant for interim white liquor filter use until the future dedicated white liquor filter was implemented, had been dedicated to white liquor service and was the source of significant yearly hardwood pulp production losses due to pluggages and shutdowns for acid cleaning. The new dedicated WLPF acting as the primary filter, combined with the swing filter providing backup or parallel operation, reduced the production losses as well as reduced the bleach chemical usage and costs by allowing cooking to a lower blow kappa with the additional white liquor available. The acquisition of used pressure filter helped to offset the project costs and improve project payback time period.
TECHNICAL PROBLEM SOLVED
The Recaust building layout was constructed to accommodate a future dedicated white liquor filter of similar dimensions to the installed filters. The smaller dimensions of the used filter required building structural modifications in order to accommodate filter support brackets and nozzle and existing collection header locations. Design adaptations were required to connect to the WLPF JIS flanges.
WHAT WE DID
Temec designed the building structural modifications in a timely manner in order that the WLPF installation could be scheduled to align with the site crane rental timeframe in order to reduce installation costs. Piping design was completed in phases, with the initial phase design comprising ‘Block, Bleed, Blind’ design to permit safe installation of the remainder of the piping after the WLPF installation while the existing system is operating. The piping design included pre-fabricated pipe spools, completed and tested in the shop, in order to minimize site construction costs. The pump design offered operational flexibility by including a valve arrangement and pump sizing that permitted feeding to either filter.
PROJECT LIFECYCLE SERVICES USED