催化油浆沉降-无机膜脱固组合技术研究

Research on Combined Technology of FCC Slurry Sedimentation and Inorganic Membrane Solid Phase Removal

催化油浆中含有催化剂粉末等固体杂质,且分离困难,严重限制了催化油浆的综合利用。中石化大连院开发的催化油浆无机膜脱固技术已在中石化、中石油、中海油等多家企业应用,净化油浆满足调和低硫船用燃料油和生产高端碳材料的要求,且装置实现长周期稳定运行。为进一步降低催化油浆无机膜脱固装置投资成本,提高装置运行周期,考察了催化油浆沉降在不同工艺条件下的脱固效果,对比了催化油浆沉降-无机膜组合脱固技术和无机膜脱固技术的经济性,提出了一种经济高效的催化油浆组合脱固技术。采用该组合工艺,净化油浆固相质量分数42 mg·kg^(-1),灰分为<0.01%,金属质量分数为3.02 mg·kg^(-1),各项指标满足催化油浆综合利用要求。据测算,30万t·a^(-1)催化油浆无机膜脱固装置采用该组合工艺,无机膜膜管使用数量减少40%,无机膜装置投资减少26.7%,同时可进一步降低无机膜装置的运行费用,延长装置的运行周期。

FCC(Fluid Catalytic Cracking)slurry contains a large amount of solid impurities that are hard to separate,which seriously limits its comprehensive utilization.The FCC slurry inorganic membrane solid phase removal technology developed by Sinopec(Dalian)Research Institute of Petroleum and Petrochemicals Co.,Ltd.has been applied in many enterprises,such as Sinopec,Petrochina,CNOOC,etc.The purified slurry meets the requirements of blending low-sulfur marine fuel oil and producing carbon materials,and the device achieves long-term stable operation.In order to further reduce the investment cost of inorganic membrane solid phase removal device and improve the operation cycle of the device,the solid phase removal effect of catalytic slurry sedimentation under different process conditions was investigated,and the economy of catalytic slurry"sedimentation-inorganic membrane desolidifying"combined technology and inorganic membrane solid phase removal technology were compared,and an economical and efficient catalytic slurry combined solid phase removal technology was proposed.With the combined process,the solid mass fraction of the purified slurry was 42 mg·kg^(-1) and the ash content was less than 0.01%,the metal mass fraction was 3.02 mg·kg^(-1) all indicators met the requirements of comprehensive utilization of catalytic slurry.It was estimated that the 300 kt·a^(-1) catalytic slurry inorganic film solid phase removal device adopted the combined process,the number of inorganic film tubes was reduced by 40%,the investment in inorganic film devices was reduced by 26.7%,and the operating cost of inorganic film devices was further reduced and the operating cycle of devices was extended.