基于物相识别定量的中速磨煤机煤炭混合破碎机理研究

中速磨煤机是燃煤电厂煤粉制备关键设备，运行过程中存在能耗较高、效率偏低的问题。究其原因，主要是封闭磨机内煤炭混合破碎机理和能量分配机制不明确，传统煤炭破碎研究方法与设备和中速磨煤机研磨机理不同，研究结论指导性较差。为解决这些问题，本项目以中速磨煤机内煤炭混合破碎“模型构建→现象分析→机理揭示→方案优化”为主线，开展以下研究：建立表征煤炭单相破碎的数学模型，揭示破碎行为及能耗对煤炭性质响应机制；提出混合破碎产物各物相识别和定量方法，从破碎速率和产物细度变化角度阐明混合破碎中各物相间的作用机理；建立包含煤炭性质参数的多输入混合破碎数学模型，在混合破碎能量平衡基础上提出各物相能量分配因子计算方法，阐明物相性质和质量比例对能量分配和能量效率影响机制；实现基于实验数据驱动的煤炭混合破碎模型优化和破碎过程参数预测，为优化煤炭混合破碎方案，提高能量效率，降低能量消耗提供理论支撑。

Vertical spindle pulverizer (VSP) is the key device for pulverizing coal in coal power plants. But the operation process of VSP faces problems of high energy consumption and low efficiency. The reason is that mechanisms of mixture breakage and energy split of coal in closed VSP are not clear enough. On the other hand, traditional research methods and device for coal breakage show differences in grinding mechanism with VSP, and guidance of research conclusions are poor. In order to solve these problems, this project proposes the main line of “models establishment→phenomena analyses→mechanism reveal→schema optimization” for the mixture breakage of coal, and conducts following studies. Firstly, mathematical models for the single-breakage of coal are developed to reveal function mechanisms of coal properties on breakage behavior and energy consumption. Secondly, identification and quantification method of each component in mixture breakage products is proposed to reveal interaction among coals during the multi-component breakage process from the change of breakage rate and product fineness. Then, multiple input and output model for the multi-component breakage process is developed. Calculation method for energy split factors is proposed based on the energy balance to illustrate the effect of coal properties and mixed ratios on the spilt energy and breakage energy efficiency of components. Finally, optimization of multi-component breakage model and prediction of breakage process parameters are conducted based on experimental data. This project may give theory guidance for optimizing the scheme of mixture breakage, increasing the energy efficiency of mixture breakage and reducing energy consumption.