低温风透干燥技术在煤样制备中的应用研究

Study on low temperature air permeability drying technology for coal sample preparation

在煤样破碎前对其进行干燥除湿,可保证煤样在制备过程中顺利通过破碎、缩分等后端制备环节。简介风透干燥技术原理,结合风透干燥物理模型搭建实验平台并进行大量实验测试验证,从筛网选择、干燥控温、干燥结束判断等方面研究风透干燥技术,从而解决煤样制备干燥环节中干燥效率低、干燥温度不可控、干燥不均匀等问题。研究结果表明,在保证样品完整性和代表性不被破坏的前提下,通过低温风透干燥技术实现其干燥温度可控、可调且煤样干燥相对均匀一致,同时大幅缩短煤样的干燥时间及提高整体制样效率,可为煤样制备领域中全自动制样设备的研究及改进提供详细的实施方案和数据支撑。

In the process of coal sample preparation,in order to ensure that the coal sample passes the back-end preparation links such as crushing and shrinkage,it is necessary to remove the external water from the coal sample before crushing.The theory of air through drying technology was introduced and the experimental platforms were built based on the physical models of air through drying,a large number of experiments were done.From the aspects such as screen selection,drying temperature control,drying ending judgement,the air permeability drying technology was researched,thus the low efficiency,uncontrollable drying temperature and uneven drying in coal sample preparation drying stage could be resolved.The results show that:under the conditions that sample integrity and representativeness is ensured,through the low temperature air permeability drying technology,the drying temperature can be controlled and adjusted,the coal samples’drying can be relatively uniform and consistent,the drying time of the coal samples can be greatly shortened,the overall sample preparation efficiency can be improved.Therefore,a detailed implementation scheme and data support for the research and improvement of the automatic sample preparation equipment in the field of coal sample preparation can be provided.