Operating Experience of Advanced Process Control （APC） on the Kraft Pulp Bleaching Process

Abstract

At Akita mill, fuel cost reduction in the kiln process has been achieved by use of oil cokes that started in 2013, there is more room for the energy saving because the operation of the kiln still depends on the experience of the operator. Also in the bleaching process, there is room for chemical saving because the process is always operated conservatively to keep the final brightness in the upper part of target range. For the above reasons, we introduced process optimization system to both the kiln and bleaching process in expectations of steady operation and cost reduction. Now, we are working on an early realization of the process improvement.

In this report, the management after the introduction of the system and the operation after the modification of bleaching process are explained. Although this system has many installation records overseas, it is first installation in Japan.