摘要
采用管式炉在750～900~C内进行了草浆黑液半焦水蒸气气化实验，考察了温度、苛化剂TiO：对气体产物及固体产物的影响；采用热重分析仪在850~C下进行了半焦的水蒸气气化实验，探究了TiO2对半焦热失重特性的影响。结果表明：在750～900~C内，TiO：的添加使得气体产物中CO：增加约5％、H：减少约5％，碳转化率上升约10％，产气热值下降约7％；TiO2可避免气化过程中熔融物的生成；随着温度的升高，固体产物中无机盐的种类未发生变化；TiO2与半焦中的Na2CO3反应生成Na2O·nTiO2，与Na2SiO3结合生成Na2TiSiO5，改变了元素Na与si的存在形态。
The steam gasification of wheat straw black liquor char （BLC） was studied in a laboratory- scale tube furnace at temperature from 750~C to 900℃. The impacts of temperature and causticizing agent TiO2 on characteristics of gas and solid product during gasification process were investigated. Influence of TiO2 on weight loss characteristics of BLC was also studied by thermo gravimetric analyzer at temperature 850℃. Results showed that at temperature from 750~C to 900℃ , with TiO2 addition, the relative concentration of CO2 increases by about 5% while the relative concentration of H2 decreases by about 5% in gas product, at the same time the gas heating value reduces by about 7% ; however, carbon conversion rate increases by about 10% without melting of char in the gasification process; temperature has no significant effect on the composition of the solid product. Furthermore, TiO2 changes the partition of Na and Si in char. TiO2not only reacts with Na2CO3 to form Na20.nTiO2, but also combines with NazSiO3 to generate Na2TiSiO5.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2014年第1期150-154,共5页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金资助项目(51176195)
'十二五'国家科技支撑计划资助项目(2012BAA09B03)
关键词
草浆黑液
碱回收
直接苛化
水蒸气气化
Wheat straw black liquor Alkali recovery Direct causticization Steam gasification
