Analysis of Tars Produced in Pyrolysis of Four Coals under Various Conditions in a Viewpoint of Radicals
Analysis of Tars Produced in Pyrolysis of Four Coals under Various Conditions in a Viewpoint of Radicals
复制标题
从自由基的角度分析四种煤在不同条件下热解产生的焦油
DOI：
10.1021/acs.energyfuels.5b00594
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发表时间：
2015-06-01
期刊：
影响因子：
5.3
通讯作者：
Ci, Donghui
中科院分区：
文献类型：
--
作者：
He, Wenjing;Liu, Zhenyu;Ci, Donghui
许多研究试图将煤热解条件与焦油的反应性联系起来，但很少有人分析焦油的自由基浓度。本文研究了四种含碳量为74- 82wt%的煤在固定床管式反应器中在三种升温速率和三种N2吹扫速率下的热解。分析了焦油在各种条件下，如在溶剂（己烷或四氢呋喃）或高温（300，350，400和450 ℃）下自由基浓度的变化。热解条件对焦油自由基浓度的影响归因于反应器中气相和煤之间的温度差，这导致焦油的进一步裂解。从煤的结构和热解机理的角度阐述了不同煤种热解焦油中自由基浓度的差异。
Many studies tried to correlate coal pyrolysis Conditions with reactivity of tars produced, but few analyzed the radical concentration of tars. This work studies pyrolysis of four coals, with carbon content in a range of 74-82 wt %, in a fixed-bed tubular reactor at three heating fates and three N-2-purging rates. The changes in the radical concentration of tars under various conditions, such as in solvents (hexane or tetrahydrofuran) or at high temperatures (300, 350, 400, and 450 degrees C) are analyzed. The effect of pyrolysis conditions on the radical concentration of tars is ascribed to the temperature difference between the gas phase and the coal in the reactor, which results in further cracking of tars. The difference in the radical concentration in tars obtained from pyrolysis of different coals is elaborated in a viewpoint of the coal structure and pyrolysis mechanism.