Kinetics of Coal Conversion in Supercritical Water
Kinetics of Coal Conversion in Supercritical Water
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DOI：
10.1021/ef070127a
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发表时间：
2007-07
期刊：
影响因子：
5.3
通讯作者：
A. A. Vostrikov-A.;S. Psarov;D. Dubov;O. N. Fedyaeva;M. Sokol
中科院分区：
文献类型：
--
作者：
A. A. Vostrikov-A.;S. Psarov;D. Dubov;O. N. Fedyaeva;M. Sokol
在半间歇反应器中对超临界水中煤颗粒的转化进行了研究，实验条件为：压力P=30 Mpa，反应温度T=500−750°C，反应时间t=60−720 S，对实验结果进行了均相、未反应核和随机孔模型的分析。测定了转化产物的定量组成。在一级反应和Arrhenius依赖的假设下，描述了转化率与煤的转化率、反应时间和温度的关系。得到转化活化能E=103kJ/m o l，指前因子A0=1.3×103.1 S-1。结果表明，无氧化剂超临界水气化为弱吸热过程。超临界水中添加CO2降低了转化率，提高了CO产率。
Conversion of the coal particle pack in supercritical water (SCW) was studied in the semibatch reactor under the pressure of P = 30 MPa, in the temperature range of T = 500−750 °C, and in the reaction time of t = 60−720 s. The experimental results were analyzed within the framework of homogeneous, nonreacted core, and random pore models. The quantitative composition of conversion products was determined. Dependences of the conversion rate on the degree of coal conversion, reaction time, and temperature were described in an assumption of the first-order reaction and Arrhenius dependence. It was found that activation energy of conversion is E = 103 kJ/mol and the pre-exponential factor is A0 = 1.3 × 103.1 s-1. It was revealed that coal gasification in SCW without oxidants is the weakly endothermic process. The addition of CO2 into SCW decreases the conversion rate and increases the CO yield.