Case Study of Steam Saving at Dryer of No. 4 Paper Machine

Abstract

Our No. 4 paper machine operated at Hachinohe mill of Mitsubishi Paper Mills LTD was not really outstanding at steam saving as compared with other paper machines.
A factor is difference of the steam consumption at the dryer part. And problems are lower efficiency of the steam equipment and differences of the operational condition, the mechanical drainage flow, and the drainage balance. We modified the drainage system as a solution of these problems in December 2013 and achieved big steam saving.
This report is described about the past problems, the modifying of drainage system, and the result of steam saving.