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Mathematical Problems in Engineering
Volume 2014, Article ID 267276, 11 pages
http://dx.doi.org/10.1155/2014/267276
Research Article

System Model of Heat and Mass Transfer Process for Mobile Solvent Vapor Phase Drying Equipment

1School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110004, China
2Shenyang Chengqiao Science and Technology Development Co., Ltd., Shenyang 110025, China

Received 16 May 2014; Accepted 17 July 2014; Published 3 September 2014

Academic Editor: Jun Liu

Copyright © 2014 Shiwei Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The solvent vapor phase drying process is one of the most important processes during the production and maintenance for large oil-immersed power transformer. In this paper, the working principle, system composition, and technological process of mobile solvent vapor phase drying (MVPD) equipment for transformer are introduced in detail. On the basis of necessary simplification and assumption for MVPD equipment and process, a heat and mass transfer mathematical model including 40 mathematical equations is established, which represents completely thermodynamics laws of phase change and transport process of solvent, water, and air in MVPD technological processes and describes in detail the quantitative relationship among important physical quantities such as temperature, pressure, and flux in key equipment units and process. Taking a practical field drying process of 500 KV/750 MVA power transformer as an example, the simulation calculation of a complete technological process is carried out by programming with MATLAB software and some relation curves of key process parameters changing with time are obtained such as body temperature, tank pressure, and water yield. The change trend of theoretical simulation results is very consistent with the actual production record data which verifies the correctness of mathematical model established.