This project was completed for Cascade Pacific Pulp and involved budget preparation, detailed process design, detailed engineering, and contract document development. The new tower was constructed beside the existing up-flow tube to allow a quick and easy tie-in and keep down time to a minimum. The new system will have a retention time of 5 hours, vs just 2 hours with the old tower, when operated at the mill’s normal production rate.
To control costs, much of the existing piping, valves, instrumentation, and electrical services, are re-used in the new process. Two existing pumps are also modified and/or relocated to suit the new arrangement.
The goals of the project are to replace a small, badly corroded tower, reduce bleaching chemical usage, save energy, and improve pulp quality.