基于溶剂萃取和机器学习的煤特性改善和预测

Improvement and prediction of coal ignition characteristics based on solvent extraction and machine learning

  • 摘要: 首先通过热重分析仪在非等温条件下研究了4种煤在溶剂萃取和非溶剂萃取下的热分解行为,并用Arrhenius、Coats-Redfern、Doyle-Ozawa和Friedman等4种方法测定了煤的动力学参数和活化能,实验结果表明,煤的溶剂萃取使活化能降低了约50%,并对16种典型煤及48种混合煤的化学成分和着火性能进行了Pearson相关分析,结果表明,煤的水分、挥发分、固定碳、热值、氧和碳含量是影响着火温度和活化能的最相关因素. 其次,提出一种三层BP神经网络模型,并基于100种煤样品对其进行训练,进而用训练后的模型对15种混合煤的着火特性进行了预测,实验结果表明,该模型具有较高的预测精度,其对着火温度和活化能预测的相对平均误差分别为0.42%和4.49%,均方差分别为9.89和103.82,这对将来进一步调配混合煤来改善原煤的着火特性有一定的指导意义.

     

    Abstract: This article first studied the thermal decomposition behavior of four types of coal under solvent extraction and non-solvent extraction conditions using a thermogravimetric analyzer under non-isothermal conditions. The kinetic parameters and activation energy of coal were determined using four methods: Arrhenius, Coats Redfern, Doyle Ozawa, and Friedman. The experimental results showed that solvent extraction of coal reduced the activation energy by about 50%. Pearson correlation analysis was conducted on the chemical composition and ignition performance of 16 typical coals and 48 mixed coals. The results showed that the moisture, volatile matter, fixed carbon, calorific value, oxygen, and carbon content of coal were the most relevant factors affecting ignition temperature and activation energy. Secondly, this article proposes a three-layer BP neural network model and trains it on 100 coal samples. The trained model is then used to predict the ignition characteristics of 15 mixed coals. The experimental results show that the model has high prediction accuracy, with relative average errors of 0.42% and 4.49% for predicting ignition temperature and activation energy, and mean square deviations of 9.89 and 103.82, respectively. This has certain guiding significance for further blending of mixed coals to improve the ignition characteristics of raw coal in the future.

     

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