胜利褐煤焦水蒸汽气化生成气及等温动力学研究

Study on the Isothermal Steam Gasification Formed Gases and Kinetics of SL-raw lignite and Chars

利用固定床微反-色谱装置,对内蒙古胜利褐煤等温水蒸汽气化过程中气态产物H2、CO、CH4和CO2的生成规律及其生成动力学进行了研究。研究结果表明,在胜利原煤及其半焦等温水蒸汽气化过程中,随着反应温度的升高,四种气化气达到最大流量和最大反应速率的时间均在逐渐减小,且最大反应速率值在逐渐升高。对同一种煤样随着气化温度的提高,H2/CO逐渐减小,H2+CO+CH4的量在逐渐增大,且在973K制得的煤焦在相同气化温度下具有最大H2+CO+CH4产量。动力学研究结果表明,H2的生成活化能和指前因子随制焦温度的提高而升高,而CH4和CO2则在973K前后分别呈先增大后减小的趋势。

The release of the gaseous products and kinetics characteristics during isothermal steam gasification between 973-1153K of SL-raw lignite and chars were studied by temperature programmed heating in a fixed-bed reactor,GC was used to measure the formed gaseous.It is found that the time needed to get to the maximum mmole flow rate and reactivity becoming shorter with increasing the reaction temperature,while the value of maximum reactivity becoming higher during the process of isothermal steam gasification of SL-raw lignite and chars.The mmole ratio of H2/CO decreased while the cumulative amount of H2＋CO＋CH4 increased as the gasification temperature increase from 973K to 1153K for the same sample.However,SL-te（973） has the maximum yield of H2＋CO＋CH4 when samples gasified at 973,1023,1073,1123 and 1153K respectively.The kinetic results show that the generate activation energy and pre-exponential factor of H2 increased with the pyrolysis temperature was increased,but CH4 and CO2 get it＇s highest value when the SL-raw lignite pyrolysized at 973K.