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为研究低品质煤炭在堆积状态下的自然发火特性,根据煤样自热过程中能量的转化和积聚条件,基于Frank-Kamenetskii理论,采用差热分析仪(DTA)和恒温加热系统,试验测试煤样临界自燃着火点温度(CSIT)。通过分析环境设定因素及验证关联试验,可将煤样升温过程划分为4个不同变化阶段。在试验条件下煤堆体积主要影响其CSIT;煤样水分是导致升温曲线平缓或下降的主要原因,且体积越大影响越明显。结果表明,通过实验室小体积类比试验分析推导堆积体积与CSIT关系式是准确可行的;用小体积试验可有效预测大体积煤炭自燃着火点温度范围。
In order to study the spontaneous combustion characteristics of low-quality coal in the accumulation state, according to the energy conversion and accumulation conditions in coal self-heating process, based on Frank-Kamenetskii theory, differential thermal analyzer (DTA) and constant temperature heating system, Like the critical ignition temperature (CSIT). By analyzing the environmental setting factors and verifying the correlation test, the process of coal sample warming can be divided into four different stages of change. Under the experimental conditions, the volume of coal pool mainly affects its CSIT. The water content of coal sample is the main reason causing the temperature curve to be gentle or declining, and the larger the volume is, the more obvious the influence is. The results show that it is accurate and feasible to derive the relationship between the volume of deposition and CSIT through the analysis of laboratory small volume analogy test. The small-volume test can effectively predict the ignition temperature range of large-volume coal spontaneous combustion.