Mill experiences of Evacuating Refiner Plates （轧机疏散炼油企业板块的经验）.pdfVIP

Mill experiences of Evacuating Refiner Plates 1 2 2 1 1 Ola Johansson Russell Steed Roger Jones Neil Murray Anders Sundström 1 JL Fiber Services, Inc. 2 Pan Pac Forest Products, Ltd. Waukesha WI, USA Napier, New Zealand Abstract The Thermo Mechanical Pulp process (TMP) has many advantages, but the recent worldwide increase in electrical energy cost threatens the existence of the process. The majority of the electrical energy consumed is a lied in the refiners as mechanical energy put into the fibers through energy transfer which also produces an enormous amount of heat. For years researchers have measured and studied the impact of the temperature within the process on refining efficiency and pulp quality. It is clear that the process performance can be affected significantly by altering the operating temperature and pressures. The concept of evacuating refiner plates was introduced at the IMPC 2005[1] conference. With this technology the unrefined particles take a separate path from the already refined particles and steam. This makes it possible to control and alter the temperature and pressure profile prevailing in the refining zone. As a consequence the refining conditions can be optimized for higher refining efficiency. Pilot plant studies at the Ensis Papro plant resulted in significant improvements in refining efficiency, as well as creating the possibility for ultra low intensity refining. Since the pilot plant introduction a joint venture was established between Pan Pac Forest Products Ltd. (Pan Pac) and JL Fiber Services, to explore if similar improvements could be achieved in a commercial size refiner system. Different filter configurations, plate patterns, and operating conditions have been explore