塗工紙乾燥における省エネルギー装置: 新型ハイインテンシティエアドライヤの導入効果

摘要

Coating drying is expensive. A great deal of energy is needed to effectively evaporate sufficient water to dry the coating. In production of coated paper or board, the amount of water evaporated in the coater dryer section is typically 0.1 to 0.2 ton H_2O per ton of produced paper or board. In terms of the operating costs of coating drying there are two important factors; 1) the specific energy consumption in the drying and 2) the price of the energy source used in the dryers. The specific energy consumption in the coater dryer section can vary from 4,500 to 10,000kJ/kg evaporated water, depending on the drying concept, dryer adjustments and other operating parameters. Different energy sources, for example natural gas, LPG gas, medium or low pressure steam and electrical power are generally used in the coater dryers. While traditional drying has been successful, recent developments have taken the coater drying process to a new level; offering substantial savings never before available.rnThis paper presents the development of new dryer bars and dryer designs have opened up a number of possibilities to improve coater drying with significant benefits in reducing energy, improved finish quality, carbon footprint reduction, increased operating efficiency and improved overall Mill profitability.rnTypical savings are in the order of 10 ~ 15%. Compared to IR drying savings are in the neighborhood of 30 — 50% compared to traditional air drying%塗工乾燥工程において効果的に水分を 蒸発させるには，大量のエネルギーが必 要であり生産コストもかかる．塗工紙や 板紙の生産においてコ一夕ドライヤパー トで蒸発させる水分量は，通常生産され た紙および板紙1t当たり0.1～0.2tであ る．塗工乾燥の運転コスト面に関し，重 要な項目は次の2点である．