工艺条件对RFT-2催化剂固定床费-托合成性能的影响

在固定床费-托合成装置上研究了反应温度、压力、n(H2)/n(CO)、空速、汽包压力和表观气速对工业生产的RFT-2催化剂反应性能和催化剂床层温度分布的影响。结果表明反应温度对RFT-2性能影响显著，随温度提高活性迅速增加，催化剂床层的热点区域变宽和峰值增加，而且在不同温度范围对敏感程度不同。提高压力可以增加反应活性，改善选择性，催化剂床层温度分布变差。n(H2)/n(CO)主要影响费托合成催化剂的活性和产物选择性，对催化床层温度分布影响较小。空速增加会造成CO和H2的转化率的下降，选择性和催化剂床层温度分布变化不明显。通过调节汽包压力来控制催化剂床层温度非常有效和灵敏，对反应性能和温度分布影响显著。表观气速提高可以改善催化剂床层径向的传热，使反应管的传热得到强化，温度分布更加均匀。

STUDY OF FISCHER-TROPSCH SYSNTHESIS PERFORMANCE OF RFT-2 CATALYST IN FIXED-BED REACTOR

The effect of reaction temperature, pressure, ratio of H2/CO in feedstock, gas hourly space velocity, pressure of steam drum and superficial gas velocity on the Fischer-Tropsch synthesis performance over the industrial production RFT-2 catalyst were investigated in a fixed-bed reactor. The results show that increasing temperature leads to an increase of activity. The high temperature region and the temperature peak in catalyst bed are enlarged. The sensitive degree in different temperature ranges is different. Increasing the pressure increases the activity and improves the selectivity. However the temperature gradient in catalyst bed becomes larger. The ratio of H2 to CO in feedstock affects mainly the catalyst activity and product distribution, while has a less impact on the temperature distribution of catalyst bed. The increase of gas hourly space velocity leads to a decrease of CO and H2 conversion rate, while the selectivity and temperature distribution of catalyst bed did not change significantly. It is found that adjusting the pressure of steam drum is a very effective and sensitive to control the temperature of catalyst bed and it influences the catalyst performance and temperature distribution significantly. The increase of superficial gas velocity can improve the radial heat transfer of catalyst bed and make the temperature distribution more uniform.