锻压技术

生物质热压成型温度场离散元模拟

英文标题：Discrete element simulation on temperature field in biomass thermoforming

作者：李震于跃于今郝宇超万涛

单位：内蒙古科技大学

分类号：S216；TK6

出版年,卷(期):页码：2021,46(7):100-105

摘要：

温度是影响生物质致密成型过程及燃料成型品质的关键因素之一，针对其致密成型传热机理及能量转换过程，应用EDEM-API二次开发对致密成型过程中的温度变化规律进行研究。通过离散单元法仿真分析生物质模型瞬态温度场，探究致密成型过程中温升和传热特性的演化规律，同时，从生物质密度、粒径、各时间分布等方面分析热压成型过程中温度场的变化。结果表明：在相同条件下，随着生物质材料密度增加，传热效果越好；粒径的增加，导致热传递效果逐渐减弱，粒径为Φ0.5 mm的生物质温升最快；传热过程中，压缩阶段的温度变化较大，保压阶段的温度变化平缓，生物质外部颗粒温度呈现梯度递减趋势并向内部传递。

Temperature is one of the key factors affecting the dense molding process of biomass and the quality of fuel molding, and for the heat transfer mechanism and energy conversion process of the dense molding, the temperature change law during the dense molding process was studied and analyzed by the secondary development of EDEM-API. Then, the transient temperature field of the biomass model was simulated and analyzed by the discrete element method to explore the evolution law of temperature rise and heat transfer characteristics in the process of the dense molding, and the change of temperature field in the thermaoforming process was analyzed by biomass density, particle diameter sizes, distribution for each time and other aspects. The results show that the heat transfer effect is better with the increasing of biomass density under the same conditions, and the increasing of particle diameter sizes leads to the gradual decrease in the heat transfer effect, but the biomass with the particle diameter size of 0.5 mm has the fastest temperature rise. In addition, in the process of heat transfer, the temperature changes greatly in the compression stage and gently in the pressure holding stage, and the external particles of biomass show a trend of temperature gradient decline to the internal transfer.

基金项目：

内蒙古自治区自然科学基金资助项目（2020LH05020）；国家自然科学基金资助项目（51666016）

作者简介：李震（1973-），男，博士，教授，E-mail：lizhen_730106@126.com；通信作者：于跃（1994-），男，硕士研究生，E-mail：1214231191@qq.com

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