煤氧化过程中CO生成机理的原位红外实验研究

为了明确煤氧化过程中CO的生成机理与生成途径，利用红外光谱仪与原位反应池，研究了煤低温氧化过程中，醛基、酮基与醌基3种官能团与CO产生规律的关联性，并对3种CO前驱体的表观活化能进行了推导计算。结果表明：煤在不同氧化阶段的CO是由不同的前驱体生成；3种CO前驱体生成的表观活化能值均小于CO释放活化能，CO前驱体生成反应速率大于CO前驱体分解反应速率；在煤低温初始氧化阶段，对于变质程度较低的褐煤，酮类化合物为生成CO的主要前驱体，而在变质程度较高的无烟煤中，CO释放的主要前驱体为醌类化合物。当煤体温度升高至80 ℃，醛基、酮基与醌基3种官能团的化合物共同作为煤氧化生成CO的前驱体，当煤体温度高于150 ℃，醛类化合物为生成CO的前驱体，与煤种无关。

Research on the release mechanism of CO in coal oxidation using in-situ FTIR

To further definite the generation mechanism and routes of CO in coal oxidation,infrared spectrometer and in-situ reaction pool were used to investigate the change rule of aldehyde group,ketone group and quinone group with changing temperatures and CO concentrations,meanwhile,the apparent activation energy of CO precursor was calculated.The results show that CO is generated by different precursors.The apparent activation energy in generating three kinds of precursors is less than the activation energy in releasing CO,so the reactive rate for the production of CO precursors is greater than the reactive rate for the decomposition of CO precursors.In the coal initial phase at low temperature,ketone compounds are main precursor to generate CO in lignite,while quinones compounds serve as the main precursor to generate CO in anthracite.When oxidizing temperature is up to 80 ℃,three kinds of functional groups of compound are CO precursor.When temperature is higher than 150 ℃,aldehyde group is the precursor of CO,regardless of coal type.