操作条件对下行床油剂混合区液固接触的影响

利用由催化剂染色法和模式识别法结合微观成像系统组成的定量测量系统分别考察了下行风、剂油比和气液比等操作条件对油剂接触效果的影响程度。其中剂油比对油剂接触效果的影响最大；下行风的增加会造成油剂接触效果变差：随着剂油比的增加着色率和深度染色率均下降并存在一个明显的拐弯点(当剂油比等于25时)，油剂接触效率随着剂油比的增大呈上升趋势。气液比对油剂接触的影响较复杂，受剂油比的影响较大，着色率和深度染色率在不同剂油比下的变化趋势不同。因此在下行风较低、采用符合反应要求的剂油比和与此剂油比相匹配的最优的气液比时能达到较为理想的油剂接触效果。

Influence of Operating Conditions on Liquid-Solid Contact in the Feed Stock Zone of a Downer

In order to investigate the influencing degree of operating conditions such as downflow gas, catalyst-oil ratio, gas-liquid ratio, a quantitative measurement system including catalysts dyeing, pattern recognition and microscopic imaging system, which focuses on liquid-solid contact efficiency in the feed stock zone of a downer, was used. Among those investigated conditions, catalyst-oil ratio is the most important influencing factor; the increase of downflow gas will decrease the liquid-solid contact efficiency; with the growth of catalyst-oil ratio, the contact efficiency of liquid-solid has upward trend while deep dyeing percent and dyeing percent have descending tendency; there is a inflection point of deep dyeing percent and dyeing percent while catalyst-oil ratio approximately reaches at 25. It is more complicated as for gas-liquid ratio because the contact efficiency of liquid-solid is also effected by catalyst-oil ratio at the same time; deep dyeing percent and dyeing percent have different rules while catalyst-oil ratio changing. Thus it is found that low gas velocity, suitable catalyst-oil ratio pertinent to reaction, gas liquid ratio matching with catalyst-oil ratio, will be adopted for ideal liquid-solid contact efficiency.