园林废弃物水热炭燃料特性研究

RESEARCH ON FUEL PROPERTIES OF GARDEN WASTE HYDROCHARS

以园林废弃物为原料进行水热碳化制备固体生物燃料水热炭,研究不同温度、时间对水热炭燃料特性和燃烧行为的影响,利用燃烧动力学对水热炭燃烧过程及参数进行模拟计算。结果表明:制备的园林废弃物水热炭的燃料特性得到明显改善,且水热炭燃料特性受温度影响较为显著。水热炭热值范围为19.86~27.93 MJ/kg,达到与工业煤相当的水平。水热炭燃烧参数点火温度(T_(i))、燃尽温度(T_(f))和最大失重率温度(T_(m))随碳化温度的升高和时间的增加而增加,其失重量-失重速率(TGDTG)曲线移向高温区,表明水热炭的热稳定性提高。水热炭燃烧反应过程的动力学拟合符合一级燃烧动力学线性模型(R~2=0.93~0.99),且水热炭具有较高的反应活化能(17.33~41.34 kJ/mol)。

Hydrochars derived from garden waste were prepared by hydrothermal carbonization(HTC)for solid biofuel production.The effects of temperature and time on the fuel properties and combustion behaviors of hydrochars were investigated,and the combustion process and parameters of hydrochars were also simulated and drived through combustion kinetics analysis.The results showed that the fuel properties of obtained hydrochars were dramatically improved by preparing conditions modification,among which temperature played a critical role on fuel properties improvement.The high heating value of hydrochars was found to be ranging from 19.86 to 27.93MJ/kg,which reached a level comparable to that of industrial coal.With the increase of HTC temperature and the extension of the time,the combustion values of parameters T_(i),T_(f)and T_(m)of hydrochars increased,meanwhile,the TG-DTG curves shifted towards the high temperature range,indicating that the thermal stability of the produced hydrochars were enhanced.The results of hydrochar combustion kinetics analysis showed that the combustion reaction process of hydrochars fitted well to the first-order combustion kinetics(R~2=0.93-0.99),and the produced hydrochars had high reaction activation energy(17.33-41.34 kJ/mol).