中国电机工程学报
中國電機工程學報
중국전궤공정학보
Proceedings of the CSEE
2015年
20期
5244-5250,后插10
,共8页
唐佳%王勤辉%张睿%施正伦%岑可法
唐佳%王勤輝%張睿%施正倫%岑可法
당가%왕근휘%장예%시정륜%잠가법
煤半焦气化%气化动力学%比表面积%灰分
煤半焦氣化%氣化動力學%比錶麵積%灰分
매반초기화%기화동역학%비표면적%회분
coal char gasification%gasification kinetics%specific surface area%ash content
Langmuir-Hinshelwood (L-H)动力学模型在描述H2O与 CO2混合气氛下的煤焦气化时,存在公共活性位与单独活性位2种矛盾的反应机理假设.为解释这一矛盾现象,提出了比表面积和灰分2种可能的因素.实验在改造后的热重分析仪上进行,实验系统压力为常压,反应温度为1223K.实验结果表明,比表面积和灰分均会对煤焦气化机理产生影响.比表面积较大的煤焦,其实验结果更符合基于单独活性位假设的 L-H 模型预测值,而比表面积较小的煤焦,其实验结果与基于公共活性位假设的 L-H 模型预测值相吻合.脱灰后的煤焦,其实验结果与基于2种假设的L-H模型预测值均不吻合.
Langmuir-Hinshelwood (L-H)動力學模型在描述H2O與 CO2混閤氣氛下的煤焦氣化時,存在公共活性位與單獨活性位2種矛盾的反應機理假設.為解釋這一矛盾現象,提齣瞭比錶麵積和灰分2種可能的因素.實驗在改造後的熱重分析儀上進行,實驗繫統壓力為常壓,反應溫度為1223K.實驗結果錶明,比錶麵積和灰分均會對煤焦氣化機理產生影響.比錶麵積較大的煤焦,其實驗結果更符閤基于單獨活性位假設的 L-H 模型預測值,而比錶麵積較小的煤焦,其實驗結果與基于公共活性位假設的 L-H 模型預測值相吻閤.脫灰後的煤焦,其實驗結果與基于2種假設的L-H模型預測值均不吻閤.
Langmuir-Hinshelwood (L-H)동역학모형재묘술H2O여 CO2혼합기분하적매초기화시,존재공공활성위여단독활성위2충모순적반응궤리가설.위해석저일모순현상,제출료비표면적화회분2충가능적인소.실험재개조후적열중분석의상진행,실험계통압력위상압,반응온도위1223K.실험결과표명,비표면적화회분균회대매초기화궤리산생영향.비표면적교대적매초,기실험결과경부합기우단독활성위가설적 L-H 모형예측치,이비표면적교소적매초,기실험결과여기우공공활성위가설적 L-H 모형예측치상문합.탈회후적매초,기실험결과여기우2충가설적L-H모형예측치균불문합.
Two different controversial assumptions, common or separate active sites assumptions, existed in the Langmuir-Hinshelwood (L-H) kinetic model when coal char gasified by the mixture of H2O and CO2. This paper proposed two potential factors, specific surface area and ash content, to elucidate the reason for this controversial issue. Experiments were conducted at atmospheric condition and a temperature of 1223K, using a modified thermogravimetric analyzer (TGA) system at various reactant partial pressures. The experimental results showed that both specific surface area and ash content will affect the mechanisms of coal char gasification. The experimental data of coal char with large specific surface area fit the calculation of separate active sites assumption, while the experimental data of coal char with small specific surface area fit the calculation of another assumption very well. The experimental data of demineralized char didn't fit the calculation which based on both of these two active sites assumptions.