Kinetics of coal liquefaction during heating-up and isothermal stages

Kinetics of coal liquefaction during heating-up and isothermal stages
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加热和等温阶段煤液化动力学

DOI:
10.1016/j.fuel.2007.03.041
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发表时间:
2008-04
期刊:
影响因子:
7.4
通讯作者:
Haoquan Hu
Haoquan Hu
中科院分区:
工程技术1区
文献类型:
--
作者:
Bo Wu;Shuxun Hu;Xian Li;Shengwei Zhu;Haoquan Hu

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神华烟煤在500毫升高压罐中,以铁为催化剂,以油为溶剂,在初始氢气为8.0 Mpa,停留时间为0~90min的条件下进行直接液化。为了研究液化动力学,建立了升温阶段和等温阶段的模型,以估计这两个阶段的速率常数。在该模型中,将煤分为易反应部分、难反应部分和非反应部分,并用4个动力学常数来描述反应机理。结果表明,该模型对液化升温阶段和等温阶段均具有较好的适用性。煤液化的速率控制过程是前沥青烯加沥青烯(PAA)生成油+气(O+G)的反应。通过动力学计算,估算了等温段的上限转化率。
Direct liquefaction of Shenhua bituminous coal was carried out in a 500ml autoclave with iron catalyst and coal liquefaction cycle-oil as solvent at initial hydrogen of 8.0MPa, residence time of 0–90min. To investigate the liquefaction kinetics, a model for heating-up and isothermal stages was developed to estimate the rate constants of both stages. In the model, the coal was divided into three parts, easy reactive part, hard reactive part and unreactive part, and four kinetic constants were used to describe the reaction mechanism. The results showed that the model is valid for both heating-up and isothermal stages of liquefaction perfectly. The rate-controlled process for coal liquefaction is the reaction of preasphaltene plus asphaltene (PAA) to oil plus gas (O+G). The upper-limiting conversion of isothermal stage was estimated by the kinetic calculation.
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