小型固定床煤催化气化动力学研究

Reaction kinetics study of coal catalytic gasification in lab scale fixed bed reactor

以K2CO3和内蒙褐煤为研究对象,在小型固定床上考察了催化剂负载量、温度,氢气以及水蒸气分压对碳转化率和气化反应速率的影响。结果表明,K2CO3对煤焦-水蒸气气化反应有明显的催化作用,700℃,当添加10%的K2CO3,碳的转化率为70%,氢气的含量对煤焦-水蒸气的反应有明显的抑制作用,并采用n级速率方程和Langmuir-Hinshelwood速率方程考察了水蒸气分压的影响,分压提高,煤焦-水蒸气气化反应活性提高,采用n级速率方程得到煤-水蒸气气化反应级数为0.87,活化能为169.2k J/mol;采用L-H方程得到活化能为121.9k J/mol。

K2CO3 catalytic gasification of Neimeng brown coal was studied in a fixed bed reactor. The effects of catalyst loading, temperature, gasification agents, such as H2O and H2, and partial pressure of H2O on the carbon conversion and reaction rate were investigated. The results showed that K2CO3 could accelerated the rate of coal-steam gasification obviously, and the carbon conversion reached 70% with the addition of only 10% K2CO3 by mass at 700℃, while H2 inhibited the coal-steam gasification seriously. A kinetic reaction equation was proposed based on an n order and Langmuir-Hinshewood expression by evaluating the carbon conversion behavior. The gasification activity significantly increased with steam partial pressure. In the n order expression, the order nwas 0.87 and the activation energy was 169.2kJ/mol, and, in the L-H expression, the activation energy was 121.9kJ/mol.