煤热解反应热测定方法研究进展

Measurement of reaction heat of coal pyrolysis:state-of-the-art

煤热解既是煤炭燃烧、气化、直接液化等工艺的初始反应和伴随过程,也是煤转化的主要工艺之一,而煤热解反应热是反应器设计、热解机理研究、建模及工艺能效评估等过程所需的重要热力学参数。本文首先对煤及其他非均质有机物热解反应热测定方法和技术的研究现状做了综述性评介,分析比较了模型预测法(Merric模型、Strezov模型)和实验测定法(热值法、电功率法、计算机辅助热分析法、差示扫描量热法等)方法的优势以及存在的问题,特别关注将这些方法应用于煤热解反应热测定过程中的适应性。结果表明,在研究掌握测试参数影响煤热解反应热测定精度的规律、解决数据处理方法的前提下,基于TG-DSC同步联用法或可建立相对简单、易行、普适的煤热解反应热测定方法和技术。

In nature pyrolysis can be considered as the initial stage and/or paralleling part of coal combustion,gasification and direct liquefaction,and pyrolysis itself is also one of the fundamental technologies in coal conversion processes. Thus it is understandable that reaction heat of coal pyrolysis is of significance that it is the important thermodynamic parameter used in reactor design,mechanism study,and energy efficiency assessment. This paper presents a critical survey on the status of methods and techniques for measurement of pyrolysis reaction heat of coal and relevant heterogeneous organic matters,and a detailed analysis and comparison of these methods,such as model prediction methods（Merric model,Strezov model）and experimental measuring methods（heat value method,electricity power method,computer aided thermal analysis,and differential scanning calorimetry method）were conducted,in which especial attention was paid to the possibility of application of these methods in the measurement of pyrolysis reaction heat. Results show that an easy,but rational and considerable accurate method for measurement of coal pyrolysis heat on the basis of TG-DSC technique could be established under conditions that the effects of measuring parameters on measurement precision are thoroughly studied and elucidated,as well as the measurement data resolution process is constructed.