聚丙烯水下切粒模板温度场的数值模拟.pdfVIP

第45 卷第7 期 Vol.45 No. 7 机 械 工 程 学 报 2009 年 7 月 JOURNAL OF MECHANICAL ENGINEERING Jul. 2009 DOI：10.3901/JME.2009.07.274 * 任世雄 卢 涛 党沙沙 王奎升 (北京化工大学机电工程学院 北京 100029) 模板是聚丙烯造粒过程中最为关键的设备之一，模板的温度场对切粒质量有重要影响。建立水下切粒模板的三维传热 模型，并对该模型进行数值求解，获得模板内部的温度分布。数值结果表明，受导热油加热作用，浅层模板厚度方向剖面的 温度分布较为均匀；切粒模板受到冷却水的冷却作用，导致切粒面温度较低；在导热油加热和冷却水冷却共同作用下，切粒 面浅层的温度梯度较大。对切粒模板的温度场进行数值模拟和分析，可为模板内部的导热油通道和模孔的设计和优化提供良 好的理论支撑。 聚丙烯 模板 温度场 数值模拟 TK123 Numerical Simulation of Temperature Field of Die for Polypropylene Pelletizing under Water REN Shixiong LU Tao DANG Shasha WANG Kuisheng (School of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029) Abstract Die is one of the key devices in of polypropylene pelletizing. The temperature filed of the die has an important influence on the quality of pelletizing granules. A three-dimensional model of heat transfer for a die of pelletizing under water is established and solved by numerical simulation to obtain distribution of temperature inside the die. The numerical results show that temperature distribution of profile in different thickness due to heating of heat-conducting oil. Cooling of die results in pelletizing surface with lower temperature. Combined action of heating of heat-conducting oil and cooling of water leads to greater gradient of temperature close to the pelletizing surface. Numerical simulation and analysis of temperature field of pelletizing die can provide good theorical support for design and optimization of heat-conducting oil pipeline and die hole inside the die. Key words Polypropylene Die Temperature field Numerical simulation * 0 前言 水下切粒系统作为一种先进技术日益受到聚 合物造粒加工的重视和应用，适应大批量和持续生 产等要求，朝着大型化和强适应性等技术方向发展。 图 1 为聚