采用热重分析法对锡林浩特相同粒度褐煤煤粉热解特性进行了热分析研究。根据实验数据,计算了燃烧反应速度峰值所对应的温度。褐煤粒度相同时,升温速率对最大重量损失速率的影响很大,随着升温速率的增加,TG曲线明显出现陡度减小,最大重...采用热重分析法对锡林浩特相同粒度褐煤煤粉热解特性进行了热分析研究。根据实验数据,计算了燃烧反应速度峰值所对应的温度。褐煤粒度相同时,升温速率对最大重量损失速率的影响很大,随着升温速率的增加,TG曲线明显出现陡度减小,最大重量损失速率增大,并且峰值温度有增加的趋势,挥发分析出明显提前,热解结束时间也明显提前,即热解反应更加容易发生;DTG峰值向高温区偏移。从实验数据得到煤热解的活化能分布值显示,锡林浩特褐煤活化能随着失重率的升高而增大,活化能处于230~500 k J/mol范围。展开更多
Currently,waste disposal has been highlighted strategically all over the world.Solid recovered fuel(SRF)with a high calorific value is manufactured from municipal solid waste(MSW).Thermogravimetric Fourier transform i...Currently,waste disposal has been highlighted strategically all over the world.Solid recovered fuel(SRF)with a high calorific value is manufactured from municipal solid waste(MSW).Thermogravimetric Fourier transform infrared spectroscopy(TG-FTIR)and distributed activation energy model(DAEM)were utilized to study the pyrolysis of the individual components and their mixture(i.e.SRF),which were obtained from a MSW incineration power plant.The best operating conditions were defined by comparing the effect of heating rates and flow rates of sweep gas.The gaseous products and functional groups in the pyrolysis of each component and their mixture were researched.Additionally,a direct search method was presented to obtain the DAEM kinetic parameters.DAEM equations for volatile products were given to describe pyrolysis of SRF.The model prediction results are consistent with the experimental results.The kinetic data will provide a basis for gas composition regulation from theoretical modeling.展开更多
Utilizing calcium aluminate(CaAlO)as a catalyst in lignocellulosic biomass pyrolysis offers dual advantages of cost saving and mitigating environmental pollution from industrial waste.This study employs kinetic analys...Utilizing calcium aluminate(CaAlO)as a catalyst in lignocellulosic biomass pyrolysis offers dual advantages of cost saving and mitigating environmental pollution from industrial waste.This study employs kinetic analysis to validate the catalytic effect of CaAlO on biomass pyrolysis.Thermalgravimetric analysis of walnut shell pyrolysis was conducted,incorporating CaAlO,CaO,and Al_(2)O_(3) additives to examine catalytic pyrolysis and gas release characteristics.The results reveal that CaAlO exhibits a catalytic effect similar to that of CaO and Al_(2)O_(3),suggesting its potential as an effective catalyst.Activation energies obtained without additive and with CaAlO,CaO,and Al_(2)O_(3) by Friedman method are 184,178,158,and 176 kJ·mol^(-1),while by Flynn-Wall-Ozawa(FWO)method are 186,179,160,177 kJ·mol^(-1).Finally,distributed activation energy model(DAEM)analysis was performed,and the obtained parameters were successfully coupled into three-dimensional numerical simulation with some simplifications in the DAEM integration to reduce calculation cost,showing its potential applicability in biomass pyrolysis investigation.展开更多
文摘采用热重分析法对锡林浩特相同粒度褐煤煤粉热解特性进行了热分析研究。根据实验数据,计算了燃烧反应速度峰值所对应的温度。褐煤粒度相同时,升温速率对最大重量损失速率的影响很大,随着升温速率的增加,TG曲线明显出现陡度减小,最大重量损失速率增大,并且峰值温度有增加的趋势,挥发分析出明显提前,热解结束时间也明显提前,即热解反应更加容易发生;DTG峰值向高温区偏移。从实验数据得到煤热解的活化能分布值显示,锡林浩特褐煤活化能随着失重率的升高而增大,活化能处于230~500 k J/mol范围。
基金This research is supported by the National Key Research and Development Program of China(2018YFC1901302,2018YFF0215001,2017YFC0703100)the Innovative Research Groups of the National Natural Science Foundation of China(51621005)+1 种基金the National Natural Science Foundation of China(51676172)the Fundamental Research Funds for the Central Universities(No.2018FZA4010,2016FZA4010).
文摘Currently,waste disposal has been highlighted strategically all over the world.Solid recovered fuel(SRF)with a high calorific value is manufactured from municipal solid waste(MSW).Thermogravimetric Fourier transform infrared spectroscopy(TG-FTIR)and distributed activation energy model(DAEM)were utilized to study the pyrolysis of the individual components and their mixture(i.e.SRF),which were obtained from a MSW incineration power plant.The best operating conditions were defined by comparing the effect of heating rates and flow rates of sweep gas.The gaseous products and functional groups in the pyrolysis of each component and their mixture were researched.Additionally,a direct search method was presented to obtain the DAEM kinetic parameters.DAEM equations for volatile products were given to describe pyrolysis of SRF.The model prediction results are consistent with the experimental results.The kinetic data will provide a basis for gas composition regulation from theoretical modeling.
基金the financial support of the National Natural Science Foundation of China(22278432)National Key Research&Development Program of China(2022YFB3805602)Science Foundation of China University of Petroleum-Beijing(2462021BJRC001,2462021QNXZ007)。
文摘Utilizing calcium aluminate(CaAlO)as a catalyst in lignocellulosic biomass pyrolysis offers dual advantages of cost saving and mitigating environmental pollution from industrial waste.This study employs kinetic analysis to validate the catalytic effect of CaAlO on biomass pyrolysis.Thermalgravimetric analysis of walnut shell pyrolysis was conducted,incorporating CaAlO,CaO,and Al_(2)O_(3) additives to examine catalytic pyrolysis and gas release characteristics.The results reveal that CaAlO exhibits a catalytic effect similar to that of CaO and Al_(2)O_(3),suggesting its potential as an effective catalyst.Activation energies obtained without additive and with CaAlO,CaO,and Al_(2)O_(3) by Friedman method are 184,178,158,and 176 kJ·mol^(-1),while by Flynn-Wall-Ozawa(FWO)method are 186,179,160,177 kJ·mol^(-1).Finally,distributed activation energy model(DAEM)analysis was performed,and the obtained parameters were successfully coupled into three-dimensional numerical simulation with some simplifications in the DAEM integration to reduce calculation cost,showing its potential applicability in biomass pyrolysis investigation.
