Consideration of Energy Saving for Recycling Pulp Processing

Experiences & Ideas for New Processes and Equipments

Abstract

Recycling Pulp is divided broadly into two categories, one is brwon grade pulp for paper board and the other is deinked pulp for fine papers including news paper. Use of those pulp have been expanded for reducing product cost as well as protection of global enviroment. The cost reduction have been mainly developped by a mean of energy saving. Current specific power consumption of brown grade recycling pulp is about 5.5 kW/Ton in spite of 6.5-7.0 kW/Ton in the past, and is still reducing. That of deinked ulp, however, is extremely increasing due to complication of the processing system, because of demand of high grade quality, increase of various contaminants such as stickies and UV printed etc.. Current specific power consumption of deinked pulp is about 20-30 kW/Ton, and is still increasing. Considering those situation, energy saving of recycling pulp is still one of the main subject to be discussed among paper manufacturing engineers. In the past, energy saving has been directly approached to reduce electlicity, steam and etc.. It is now, however, approached by means of both hard and soft technologies. It is a typical example for development of hard technology that stock preparation equipment is changing to a machine having a combined function from a simple function machine. And for development of soft technology, improvement of stock yield, paper machine productivity, sticky removal, filtrate cleaning, man power saving, and use of low grade furnish are being studied.