煤无焦油气化的实验研究

Experimental Study on Tar-Free Gasification of Coal

根据上吸式和下吸式气化炉特性,设计开发了喉口型双氧化层煤无焦油气化炉,并在煤无焦油气化炉实验装置上进行了煤无焦油的气化实验研究,考察了气化炉操作参数对主要气化指标的影响.结果表明,喉口型双氧化层气化炉内气化状态良好,出炉煤气中焦油含量大大降低,煤气热值明显提高,煤气中焦油含量最低仅为10 mg/m3,煤气热值高达6 466.9 kJ/m3,完全满足各种燃烧器和加热工艺要求,实现了煤无焦油气化;操作参数对气化指标的影响本质上是通过改变气化温度来实现的,气化温度的提高促进了焦油的裂解反应,从而提高了气化煤气中CO和H2的含量,降低了煤气中CO2和焦油的含量,使煤气热值升高.

Based on the characteristic analysis of the updraft gasifier and downdraft one,a throated twin-oxidation tar-free gasifier of coal was exploited,where tarfree gasification of coal was experimentally investigated.The effects of operational parameters on gasification performance indices were studied.The results showed that the throated twin-oxidation gasifier can reduce the tar concentration of gas and raise the heating value of gas.The tar concentration and the heating value of gas can reach 10 mg/m3 and 6 466.9 kJ/m3,respectively.It entirely satisfies the various burners and heat technics＇ needs and makes the tar-free gasification of coal come true.Essentially,the effects of operational parameters on coal gasification performance indices are realized by changing the gasification temperature.The increase of gasification temperature can enhance the reaction rate of tar pyrolysis,thereby increasing the concentrations of CO and H2 and decreasing the concentrations of CO2 and tar of gas,and as a result,the heating value of gas increases.