The yield of tar and syngas has been investigated by catalytic pyrolysis of Pingzhuang lignite(PZL)over Ca(OH)2 catalyst in temperature range of 600℃-1000℃in a tube furnace.The results show that the yield of volatil...The yield of tar and syngas has been investigated by catalytic pyrolysis of Pingzhuang lignite(PZL)over Ca(OH)2 catalyst in temperature range of 600℃-1000℃in a tube furnace.The results show that the yield of volatile pyrolysis increases and char decreases with rising temperature for both raw and catalyzed Pingzhuang lignite.The hydrogen fraction(H2)increased from 20%to 40%for the PZL sample;but,for the PZL-Ca(OH)2 sample,H2 fraction fluctuated randomly between 35%to 42%,with the maximum H2 fraction found at 1000℃.The Gaschromatography mass-spectroscopic(GC-MS)analysis revealed that the maximum tar yield at 800℃and 700℃was obtained for PZL and PZL-Ca(OH)2,respectively.The surface morphology of PZL and PZL-Ca(OH)2 chars underwent different transformation in the presence of catalyst as illustrated by SEM/EDX,FTIR,and BET analysis.Furthermore,char sample was investigated for the carbon conversion and reactivity index using TGA analysis under N2 and CO atmosphere.展开更多
In this study,the Powder River Basin(PRB)coal fast pyrolysis was conducted at 700°C in the atmosphere of syngas produced by CH4-CO2 reforming in two different patterns,including the double reactors pattern(the fi...In this study,the Powder River Basin(PRB)coal fast pyrolysis was conducted at 700°C in the atmosphere of syngas produced by CH4-CO2 reforming in two different patterns,including the double reactors pattern(the first reactor is for syngas production and the second is for coal pyrolysis)and double layers pattern(catalyst was at upper layer and coal was at lower layer).Besides,pure gases atmosphere including N2,H2,CO,H2-CO were also tested to investigate the mechanism of the coal pyrolysis under different atmospheres.The pyrolysis products including gas,liquid and char were characterized,the result showed that,compared with the inert atmosphere,the tar yield is improved with the reducing atmospheres,as well as the tar quality.The hydrogen partial pressure is the key point for that improvement.In the atmosphere of H2,the tar yield was increased by 31.3%and the contained BTX(benzene,toluene and xylene)and naphthalene were increased by 27.1%and 133.4%.The double reactors pattern also performed outstandingly,with 25.4%increment of tar yield and 25.0%and 79.4%for the BTX and naphthalene.The double layers pattern is not effective enough due to the low temperature(700°C)in which the Ni-based catalyst was not fully activated.展开更多
The composition of low temperature pyrolysis coal tar has an effect on its further processing and reasomble utlization In this paper, the compeition or coal tars produced from both low temperature pyroysis in a fluidi...The composition of low temperature pyrolysis coal tar has an effect on its further processing and reasomble utlization In this paper, the compeition or coal tars produced from both low temperature pyroysis in a fluidized bed aud flash pyrolysis with solid heat carrier have been investigated by the methch of fractional seperation and Gas Chromatography-Mass Spectrometry (GC-MS)- It is observed that the degree of coalification maceral and secondary reaction temperature (freeboard temperature in a fluidized bed) have some iufluence on the composition of coal tars- The main compoundes are phenol cresols,xylenols, naphthalene, alkylnaphthalenes, antbraceue, phenanthrene,acenaphthylene, fluoren, indene and so展开更多
富油煤是集煤、油、气属性于一身的煤基油气资源,针对国内“相对富煤、缺油、少气”的能源禀赋,开发富油煤对缓解我国紧张的油气资源供应局势、实现煤炭的绿色开发和低碳利用具有重要的意义。以富油煤为主要关键词,通过CNKI和Web of Sci...富油煤是集煤、油、气属性于一身的煤基油气资源,针对国内“相对富煤、缺油、少气”的能源禀赋,开发富油煤对缓解我国紧张的油气资源供应局势、实现煤炭的绿色开发和低碳利用具有重要的意义。以富油煤为主要关键词,通过CNKI和Web of Science数据库检索自1985-2023年底已公开发表的学术论文和专利,统计分析富油煤的发展历程和主要研究内容,梳理了富油煤研究的热点方向与前沿领域,展望了未来发展趋势。研究发现:富油煤热解、赋存特征及沉积环境、孔隙和分子结构、焦油产率预测、微生物降解、资源潜力及开发利用是当前富油煤研究热点内容。富油煤含有热解可生成油气的富氢结构,如脂肪结构的侧链与桥键及缩合芳香核周缘的弱键结构;富油煤多形成于陆相沉积物供应稳定、气候温暖湿润、强还原条件下的沉积环境;孔隙结构影响富油煤的热解反应效率、焦油析出和油气运移,而分子结构(主要为脂肪族氢含量和富氢弱键)决定了富油煤的生油潜力;富油煤通过微生物的水解、发酵、产氢产乙酸和产甲烷4个阶段向油气转化。随着地质选区技术瓶颈突破及多学科交叉与融合,富油煤富油性评价指标与预测方法、富氢组分的来源与定量判识、原位开发围岩封闭性及其评价方法、微生物降解与热解联作技术将成为今后研究的热点方向。研究成果为厘清当前富油煤的研究方向和未来走势奠定了基础。展开更多
基金Supported by the Innovation Reasearch Groups of the National Natural Science Foundation of China(51621005)EPSRC from the UK.
文摘The yield of tar and syngas has been investigated by catalytic pyrolysis of Pingzhuang lignite(PZL)over Ca(OH)2 catalyst in temperature range of 600℃-1000℃in a tube furnace.The results show that the yield of volatile pyrolysis increases and char decreases with rising temperature for both raw and catalyzed Pingzhuang lignite.The hydrogen fraction(H2)increased from 20%to 40%for the PZL sample;but,for the PZL-Ca(OH)2 sample,H2 fraction fluctuated randomly between 35%to 42%,with the maximum H2 fraction found at 1000℃.The Gaschromatography mass-spectroscopic(GC-MS)analysis revealed that the maximum tar yield at 800℃and 700℃was obtained for PZL and PZL-Ca(OH)2,respectively.The surface morphology of PZL and PZL-Ca(OH)2 chars underwent different transformation in the presence of catalyst as illustrated by SEM/EDX,FTIR,and BET analysis.Furthermore,char sample was investigated for the carbon conversion and reactivity index using TGA analysis under N2 and CO atmosphere.
基金The author would like to appreciate the funding supports of the State of Wyoming and China Scholarship Council.Without their supports,the international collaboration on clean energy technology development would have been impossible.
文摘In this study,the Powder River Basin(PRB)coal fast pyrolysis was conducted at 700°C in the atmosphere of syngas produced by CH4-CO2 reforming in two different patterns,including the double reactors pattern(the first reactor is for syngas production and the second is for coal pyrolysis)and double layers pattern(catalyst was at upper layer and coal was at lower layer).Besides,pure gases atmosphere including N2,H2,CO,H2-CO were also tested to investigate the mechanism of the coal pyrolysis under different atmospheres.The pyrolysis products including gas,liquid and char were characterized,the result showed that,compared with the inert atmosphere,the tar yield is improved with the reducing atmospheres,as well as the tar quality.The hydrogen partial pressure is the key point for that improvement.In the atmosphere of H2,the tar yield was increased by 31.3%and the contained BTX(benzene,toluene and xylene)and naphthalene were increased by 27.1%and 133.4%.The double reactors pattern also performed outstandingly,with 25.4%increment of tar yield and 25.0%and 79.4%for the BTX and naphthalene.The double layers pattern is not effective enough due to the low temperature(700°C)in which the Ni-based catalyst was not fully activated.
文摘The composition of low temperature pyrolysis coal tar has an effect on its further processing and reasomble utlization In this paper, the compeition or coal tars produced from both low temperature pyroysis in a fluidized bed aud flash pyrolysis with solid heat carrier have been investigated by the methch of fractional seperation and Gas Chromatography-Mass Spectrometry (GC-MS)- It is observed that the degree of coalification maceral and secondary reaction temperature (freeboard temperature in a fluidized bed) have some iufluence on the composition of coal tars- The main compoundes are phenol cresols,xylenols, naphthalene, alkylnaphthalenes, antbraceue, phenanthrene,acenaphthylene, fluoren, indene and so
文摘富油煤是集煤、油、气属性于一身的煤基油气资源,针对国内“相对富煤、缺油、少气”的能源禀赋,开发富油煤对缓解我国紧张的油气资源供应局势、实现煤炭的绿色开发和低碳利用具有重要的意义。以富油煤为主要关键词,通过CNKI和Web of Science数据库检索自1985-2023年底已公开发表的学术论文和专利,统计分析富油煤的发展历程和主要研究内容,梳理了富油煤研究的热点方向与前沿领域,展望了未来发展趋势。研究发现:富油煤热解、赋存特征及沉积环境、孔隙和分子结构、焦油产率预测、微生物降解、资源潜力及开发利用是当前富油煤研究热点内容。富油煤含有热解可生成油气的富氢结构,如脂肪结构的侧链与桥键及缩合芳香核周缘的弱键结构;富油煤多形成于陆相沉积物供应稳定、气候温暖湿润、强还原条件下的沉积环境;孔隙结构影响富油煤的热解反应效率、焦油析出和油气运移,而分子结构(主要为脂肪族氢含量和富氢弱键)决定了富油煤的生油潜力;富油煤通过微生物的水解、发酵、产氢产乙酸和产甲烷4个阶段向油气转化。随着地质选区技术瓶颈突破及多学科交叉与融合,富油煤富油性评价指标与预测方法、富氢组分的来源与定量判识、原位开发围岩封闭性及其评价方法、微生物降解与热解联作技术将成为今后研究的热点方向。研究成果为厘清当前富油煤的研究方向和未来走势奠定了基础。
