流化床燃烧条件下过渡金属氧化物的催化固硫研究

利用流化床煤燃烧法和热重分析法研究了MnO_2、Fe_2O_3、ZnO 3种过渡金属氧化物在流化床燃烧条件下的催化固硫效果。实验结果表明,在流化床煤燃烧反应器中,MnO_2、Fe_2O_3、ZnO添加量在Me/S(摩尔比)=2.5时,煤样固硫率最高,分别为40.6%、36.2%、56.9%,添加量为原煤质量的1.0%时,其燃烬率由原煤的44.91%分别提高到57.95%、50.81%、49.36%;在热重分析实验中,MnO_2、Fe_2O_3、ZnO添加量为原煤质量的1.0%时,煤样相对于原煤着火点分别降低5℃、12℃、7℃,最大燃烧速率分别提高32.3%、13.2%、10.0%。结果表明,3种过渡金属氧化物对煤燃烧有良好的催化固硫作用。

Catalytic Sulfur Retention of the Transition-metal Oxides under Fluidized-bed Combustion Conditions

The impact of catalytic sulfur retention of MnO2, Fe2O3 and ZnO was studied by means of fluidized bed combustion reactor and thermogravimetric analysis under fluidized-bed combustion conditions. The results showed that in the flnidized bed coal combustion reactor, when the addition of MnO2, Fe2O3 and ZnO （Me/S mol ratio） =2.5, the desulfurization rate was the highest, i.e. 40.6%, 36.2%, and 56.9%, respectively, and were 7.6, 6.8 and 10.7 times that of raw coal. When the addition was 1.0% （mass） of the raw coal, the burnout ratio increased to 57.95%, 50.81% and 49.36% respectively, as compared with 44.91% of the raw coal. The thermogravimetric analysis showed that the coal combustion performance improved to a great extent by adding transition metal oxides. When the addition of MnO2, Fe2O3 and ZnO was 1.0% （mass） of the raw coal, the ignition temperature of the coal sample decreased by 5℃, 12℃ and 7℃, respectively, and the maximum burning rate increased by 32.3%, 13.2% and 10.0%, respectively. The result was that all the three transition metal oxides had very good catalytic sulfur retention effect.