渣油加氢微膨胀床反应器中的气液流动状态及床层膨胀率

在常温常压下用模拟渣油和模拟氢气近似模拟了微膨胀床渣油加氢处理反应器内的气液流动状态,考察了催化剂粒径和堆密度、虚拟气液流速以及催化剂装填高度对催化剂床层膨胀率的影响。实验结果表明:大粒径、低堆密度的催化剂床层膨胀率较高;虚拟气速与床层膨胀率关系曲线上存在拐点,拐点值随催化剂装填高度增加而增大;虚拟液体流速对催化剂床层膨胀率影响较小;在工业操作条件下,微膨胀床渣油加氢处理反应器的催化剂床层膨胀率小于10%;催化剂装填高度对床层膨胀率有明显的影响,催化剂装填量较大时,需要采用较高的气油比才能保证催化剂床层处于微膨胀状态。

Gas-Liquid Flow and Bed Expansion Ratio in Slightly Expanded-Bed of Residue Hydro Treating Reactor

The gas-liquid flow and catalyst bed expansion status in slightly expanded-bed of residue hydro treating reactor was simulated under normal reaction temperature and pressure with simulated oil and air.The effect of catalyst physical characteristics,dummy gas and liquid velocity and catalyst bed height on catalyst bed expansion ratio was researched.Test results show that bed expansion ratio of catalyst with big particle diameter and low bulk density is higher than that of catalyst with small particle diameter and high bulk density.There is a knee point in the curve between dummy gas velocity and catalyst bed expansion ratio which increases with the increasing of catalyst bed height,dummy liquid velocity has smaller influence to catalyst bed expansion ratio and catalyst bed expansion ratio of slight expanded-bed residue hydro treating reactor is lower than 10% under normal reaction condition,catalyst bed height has evident influence to bed expansion ratio,so higher gas-liquid ratio must be used to guarantee the catalyst bed to be slightly expanded when catalyst loading quantity is large.