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Enhanced accessibility of carbon in pyrolysis of brown coal using carbon dioxide
Journal of CO2 Utilization ( IF 7.2 ) Pub Date : 2018-08-30 , DOI: 10.1016/j.jcou.2018.08.022
Dongho Choi , Hana Kim , Sang Soo Lee , In-Hyun Nam , Jechan Lee , Ki-Hyun Kim , Eilhann E. Kwon

This work investigates the effect of CO2 in pyrolysis of brown coal (also referred to as lignite). CO2 changes the distribution of pyrolytic products of brown coal. More CO is generated for the pyrolysis of brown coal in CO2 than that in N2. Differential scanning calorimeter (DSC) experiments show that the pyrolysis of brown coal in CO2 is more exothermic than that in N2. This may indicate that the enhanced generation of CO is attributed to an enhanced thermal cracking induced by CO2. The more generation of CO for the reaction in CO2 (4.2 mol.% at 700 °C) than in N2 (0.5 mol.% at 700 °C) is a result of shifting carbon distribution from condensable hydrocarbons (e.g., tar) to CO. In addition, more CO is generated from the pyrolysis of brown coal in CO2 than pyrolysis of sub-bituminous coal. This study signifies that low-rank coal can be effectively used as an energy source when CO2 is employed during pyrolysis process.



中文翻译:

使用二氧化碳提高褐煤热解碳的可及性

这项工作研究了CO 2在褐煤(也称为褐煤)热解中的作用。CO 2改变了褐煤热解产物的分布。在褐煤中,CO 2中产生的CO比N 2中产生的CO更多。差示扫描量热仪(DSC)实验表明,褐煤在CO 2中的热解比N 2中的放热大。这可能表明,CO产生的增加归因于由CO 2引起的热裂解的增加。在CO 2中(700°C下为4.2 mol%)比在N 2中生成更多的CO(在700°C下为0.5 mol。%)是碳分布从可冷凝碳氢化合物(例如焦油)转移到CO的结果。此外,褐煤在CO 2中的热解比亚烟煤的热解产生更多的CO。煤炭。这项研究表明,在热解过程中采用CO 2时,低阶煤可以有效地用作能源。

更新日期:2018-08-30
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