Studying On The Technology Of The Electromagnetic Drying For Paper

Electromagnetic drying of paper is based on the principle of electromagnetic heating drying, which is different from the traditional steam drying of paper. In the day of increasingly energy and environment pressure, it is full of high sense to search the electromagnetic drying of paper. Especially for high-speed tissue paper machine, it possesses objective reality and great potential for development.This dissertation reviews the domestic and international research in heat and mass transfer for paper drying, electromagnetic induction heating, industrial process control, etc. It introduced heat and mass transfer in porous media of Luikov Whitaker phenomenological theory and the average volume theory. Following that, the concept of electromagnetic penetration drying was put forward. The drying of the electromagnetic heat and mass transfer process were analyzed. Using air drying of porous media theory, combined with the characteristics of flow through air drying, the mathematical model was established by simulating drying conditions, which concludes five differential equations: Fiber particle heat balance equation: Gaseous phase energy equation of through air: Gas continuous balance equation:. Continuous equation of solid fiber: Momentum equation of solid fiber: The mathematical model was analyzed and solved.Through hot air drying experiments was carried out by using home-made experimental device. It was found that the theoretical calculations using mathematical agreed well with the experimental results. It was proved that the mathematical model and numerical calculations were reliable and effective.Based on the principles of electromagnetic induction, combined with paper drying requirements, the dissertation uses AutoCAD software to design the appropriate laboratory electromagnetic drying device. The selection of material and structure of it's parts were analyzed. By using UG software modeling, assembly modeling module, it carried out three-dimensional simulation of the design and overall assembly of the electromagnetic drying unit. Finally, by using ANSYS software, the heat transfer and stress analysis were carried out for the main part of electromagnetic dryer device, which verified the rationality of the design in theory.By using self-made experimental device, the dissertation carried out process control experiment, experiment heating uniformity experiment, heating temperature and the accuracy of the feedback lag experiment. The results proved that electromagnetic drying technology could meet the requirements of paper drying. Through making the experiments of paper electromagnetic drying, the dissertation discussed the effects on paper physical characteristics and demonstrated that it is more suitable for production of the high absorption tissue paper. By the application experiments, it proved that electromagnetic drying was of high drying efficiency and significant economic benefits, which provides the theoretical support for the application of electromagnetic drying technology.The silicone coating of thermal insulation was developed for electromagnetic drying system. The silicone resin was obtained by the use of methyl trichlorosilane, dimethyl dichlorosilane, and phenyl-trichlorosilane. Through the study of monomer ratio, catalyst, reaction temperature and time, the well-received performance of silicone resin ratio of raw materials was that methyl trichlorosilane:dimethyldichlorosilane:phenyl trichlorosilane 2.5: 1:5. By the selection and testing of filler and additive, the high temperature resistant coating formulations were confirmed. Through a series of application experiments, it showed that the coating has good mechanical properties, thermal insulation, impact resistance properties and high temperature resistance.The study of electromagnetic drying technology of paper has both theoretical and practical significance.