| 摘要: |
| 【目的】研究不同升温速率下成型生物质的热解炭化规律。【方法】采用自行设计的热解试验装置，测定不同升温速率（5，7，10，15 ℃/min）条件下成型生物质热解过程中失重（TG）、失重速率（DTG）、工业成分（挥发分、灰分、固定碳含量）的变化及所需的活化能。【结果】通过动力学拟合，得到描述成型生物质热解过程的最合理机理函数，据此推测成型生物质热解反应机理为内扩散控制过程。当升温速率为10 ℃/min时，热解过程活化能最小，为195.52 kJ/mol。在不同升温速率下，成型生物质热解过程中的TG曲线逐渐向高温区移动，且失重速率呈先增大后减小的趋势，在升温速率为5，7，10，15 ℃/min时，成型生物质的失重速率分别在322，427，448，554 ℃时达到最大，其值分别为0.804，0.649，0.512，0.466 %/℃，可知在成型生物质热解炭化过程中，随着温度的增加失重速率呈先增大后减小的趋势，达到最大失重速率时的温度随升温速率的增大而升高，热解后成型生物质固定碳含量随着升温速率的增大而降低。【结论】较低升温速率热解有利于成型生物质热解成炭。 |
| 关键词: 成型生物质 热解 热重分析 动力学 |
| DOI： |
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| 基金项目:国家自然科学基金项目（51376085）；云南省自然科学基金项目（2011FA012）；云南省人才专项（2010CI007） |
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| Effects of heating rate on pyrolysis process of biomass briquettes |
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HUANG Rui,HU Jian-hang,WANG Hua,et al
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| Abstract: |
| 【Objective】Effects of different heating rates on pyrolysis process of biomass briquettes were investigated.【Method】The pyrolysis behavior of biomass briquettes was investigated in a self design thermo-gravimetric apparatus,and the mass loss,mass loss rate,proximate analysis (The contents of volatile,ash and fixed carbon) and needed activation energy of biomass briquettes during pyrolysis process at different heating rates (5,7,10,and 15 ℃/min) were measured.【Result】Based on kinetic fitting,the most reasonable mechanism function describing molding process of biomass briquttes pyrolysis was obtained,inferring that biomass pyrolysis reaction mechanism was the diffusion controlled process.When the heating rate was 10 ℃/min,the minimum activation energy was 195.52 kJ/mol during pyrolysis process.At different heating rates,TG curve moved gradually to the high temperature zone and the mass loss rate firstly increased followed by a decreasing trend.When the heating rates were 5,7,10,and 15 ℃/min,the maximum mass loss rates of 0.804,0.649,0.512 and 0.466 %/℃ were obtained at 322,427,448,and 554 ℃,respectively.With the increase of heating rate,the maximum mass loss rate first increased followed by a decrease trend during the pyrolysis and charring of biomass briquettes.In addition,with the increase of heating rate,the peak temperatures in DTG curves increased,while fixed carbon contents produced during the pyrolysis decreased.【Conclusion】Low heating rate was favorable for pyrolysis and charring of biomass briquettes. |
| Key words: biomass briquettes pyrolysis thermogravimetric analysis kinetic |
