微波加热强化煤泥低温干燥的机理研究

项目名称： 微波加热强化煤泥低温干燥的机理研究

项目编号： No.U1361113

项目类型： 联合基金项目

立项/批准年度： 2014

项目学科： 矿业工程

项目作者： 宋占龙

作者单位： 山东大学

项目金额： 60万元

中文摘要： 脱水干燥是高含水率煤泥品质提升的关键手段。在传统热干燥工艺的降速干燥段，随着干燥速率的降低，干燥时间和能耗显著增加，成为制约煤泥高效、快速干燥的一大瓶颈。本项目提出在常规干燥降速段辅以微波照射对煤泥进行低温强化干燥的新方法，应用微波“内部加热”机制优化水汽传热传质，有望大幅提升煤泥整体干燥速率和干燥性能，项目组前期的研究已初步证明了其可行性。拟在获取煤泥性质及水分赋存形态、类型及分布特性的基础上，研究不同干燥方式和操作参数下煤泥干燥的演变过程及相应的临界含水率范围，揭示经过常规预干燥的煤泥在微波深度干燥条件下的水分迁移规律。探索微波干燥对煤质的影响、干燥后样品的返潮特性及平衡含水率范围，阐明微波与煤泥中矿物的耦合作用对煤泥升温、干燥过程的影响。建立煤泥微波干燥模型，对煤泥中的温度场和水分迁移扩散规律进行预测。本项目研究将为探索煤泥干燥新方法、丰富煤泥干燥基础理论提供支撑。

中文关键词： 煤泥；干燥；微波；；

英文摘要： The dehydration and drying of coal slime is a key method to enhance its quality. The increase of processing time and energy consumption due to the decreasing drying rate at the falling-rate drying period have become a bottleneck for the effective and fast drying of coal slime by the traditional drying technology. In this project, a new method was put forward. This method is to adopt the traditional heating in the front zone and microwave heating at the rear to enhance the low-temperature drying of slime. The internal heating mechanism can be applied to improve the heat and mass transfer of moisture in the slime, which is promising to increase the heating rate at the falling-rate drying period with the assistance of microwave, and then promotion of coal slime drying effect can be achieved. The feasibility of this method was verified by our previous research work. Based on the acquisition of physical, chemical and structural properties of the coal slime, and the occurrence mode and distribution pattern of moisture, we can obtained the drying curves at different heating mode and operating parameters, and the critical moisture content of slime. And then, the moisture type and migration process under microwave enhanced drying condition can be revealed; the effect of microwave drying process on the coal quality, moist

英文关键词： coal slime；drying；microwave；；