煤实验最短自然发火期的快速测试

基于煤实验最短自然发火期确定煤的自燃倾向性是一种科学、可靠的鉴定方法。但由于在实验室测试煤在绝热条件下的实验最短自然发火期周期长,难以实现测试的标准化,此方法的应用受到限制。因此研究煤实验最短自然发火期的快速测试方法具有重要意义。通过理论分析与实验研究,确定70℃时煤样罐出气口的氧气体积分数(C70)与交叉点温度(Tcpt)是分别能体现出煤在低温缓慢氧化阶段及快速氧化阶段氧化升温特性的特征参数。通过程序升温测试煤低温氧化过程的特征参数C70指标和Tcpt指标,实现了煤实验最短自然发火期的快速测试。基于程序升温测试得到的实验最短自然发火期与绝热测试结果的一致性表明了此方法的准确性、可靠性及基于实验最短自然发火期确定煤的自燃倾向性的可行性。

Quick test method for the experimental period minimum of coal to spontaneous combustion

To determine the propensity of coal spontaneous combustion based on the experimental minimum period of coal spontaneous combustion is a scientific and reliable method.However，due to long test time and difficulty to achieve a standardization of adiabatic test，the application of this method is limited.Therefore，the study on a fast test method for the experimental minimum period of coal spontaneous combustion is of great significance.Through theoretical analysis and experimental study，it can be determined that the oxygen concentration of gas from coal tank outlet at 70 ℃（C70）and the crossing point temperature（Tcpt）are the characteristic parameters that can reflect the complex nature at slow oxidation stage and quick oxidation stage respectively.Through the test of the C70 and Tcpt by temperature programming，the experimental minimum period of coal spontaneous combustion can be quickly tested.Meanwhile，the consistent between the quick calculation results and adiabatic test results indicates this method is accurate，reliable and feasible for determining the coal spontaneous combustion propensity based on the experimental minimum period of coal spontaneous combustion.