共查询到18条相似文献,搜索用时 125 毫秒
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流化催化裂化是最重要的重油加工工艺之一,提升管反应器是催化裂化装置的关键部分,提升管反应器的进料混合段存在返混严重;油剂两相在提升管截面上浓度分布不均匀等问题。进料段内油滴和催化剂的混合状况对产品的收率与分布有着极为重要的影响。从喷嘴和进料段结构对改善提升管进料段的混合效果进行了分析,同时介绍了近年来研究的新成果,以及设备应用的新进展。 相似文献
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两段提升管重油催化裂化(Ⅰ型)新工艺的初步研究 总被引:7,自引:0,他引:7
针对目前催化裂化提升管反应器后半段催化剂性能严重下降以及产品分布不太合理的状况,提出了采用两段提升管催化裂化新工艺技术取代常规的单段提升管催化裂化工艺技术.该工艺的突出特征是催化剂接力、分段反应、大剂油比和短反应时间. 在对新工艺进行理论分析的基础上,以大庆蜡油掺兑65%渣油为原料,采用ZC-7300催化剂,在小型提升管催化裂化装置上进行了一系列实验,考察两段提升管催化裂化(Ⅰ型)新工艺的可行性和先进性. 实验结果表明:与常规单段工艺相比,在相近转化率下,两段柴油产率提高6~8个百分点,轻油产率提高1~2个百分点;汽油烯烃含量减少,辛烷值提高,产品质量提高. 新工艺在提高柴油收率及改善产品分布和产品质量方面具有明显优势. 相似文献
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石油加工的提升管催化裂化结构技术优化研究 总被引:2,自引:0,他引:2
催化裂化作为石油加工的核心装置,其效益的好坏,直接关系到石油加工的质量。为了更好地发挥催化裂化的作用,本文针对大港渣油加工原料的特点,开展了劣质催化裂化原料采用提升管催化裂化结构技术的优化研究。研究表明采用提升管两段催化裂化,与单段催化相比,汽油收率虽然降低,但柴油收率提高,表明两段提升管优化结构技术具有工业优势,即便对非常劣质的催化原料,仍然具有很好的适应性,且操作的灵活性得到极大的提高。 相似文献
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提出了单提升管催化裂化技术的弊端,介绍了两段提升管催化裂化技术的基本原理,分析了两段提升管催化裂化技术的研究情况,最后,讨论了两段提升管催化裂化技术在国内炼油工业的应用。 相似文献
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采用轴径向二维扩散模型对提升管-下行床耦合反应器催化裂化反应进行了数学模拟,并与提升管及下行床进行了对比.结果表明,在下行床之前耦合一段适当长度的提升管不仅可以保证原料具有较高的转化率,而且可以保证目的产品的选择性较高,缩短达到相同产品收率所需的下行床长度.这种耦合反应器充分利用了提升管与下行床各自的优势,并可以根据具体的原料及产品需求调整进料的位置以改变提升段与下行段的长度比例,实现柔性操作. 相似文献
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Based on the subsidiary riser FCC (SRFCC) process for gasoline reformation [Y.H. Bai, J.S. Gao, S.C. Li, C.M. Xu, Petrol. Process. Petrochem. (China) 35 (2004) 17–21, J.S. Gao, C.M. Xu, Y. Mao, et al., Petrol. Refin. Eng. (China) 35 (2005) 7–9], a novel conceptional process for residue catalytic cracking and gasoline reformation dual-reactions mutual control (DMC) was proposed and relevant experimental researches were carried out in a Technical Pilot Scale Riser (TPSR) FCC apparatus. The goals of DMC were to improve product quality and increase desirable product yield in residue catalytic cracking as well as in FCC gasoline upgrading. The experiments showed that the decrease of temperature difference between feedstock and regenerated catalysts in DMC by directly leading the cooled regenerated catalysts into riser reactor or feeding gasoline into riser reactor in vapor phase could decrease the amount of dry gas and coke and obtain a better quality of upgraded gasoline. Moreover, the spent catalysts still retaining high level of activity could be recycled to the base of the main riser reactor treating heavy oil and mixed with regenerated catalysts in DMC, it allows residue catalytic cracking to operate at high catalyst-to-oil ratio and the relatively low inlet catalysts temperature. The experimental results also showed that the mixed catalysts could improve the product selectivity in residue catalytic cracking, especially for light oil (gasoline and diesel). In addition, compared with the routine RFCC, the product distribution from the residue catalytic cracking in DMC contains more liquid products, less dry gas, and a better gasoline quality. 相似文献
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Xingying Lan 《Chemical engineering science》2009,64(17):3847-29
The Eulerian-Eulerian approach was applied to simulate the flow behavior and catalytic cracking reactions in the riser reactors of two-stage riser fluid catalytic cracking (TSRFCC) technology. A k-ε-kp-εp-Θ gas-solid turbulent flow model was used, which took account of the particle turbulence and the interaction of turbulence between gas and particle phases. A 14-lump kinetics model was used for simulating cracking reactions. The approach and model were validated with both experimental results and commercial data. The distributions of particle fraction volume and velocity, as well as product yields in the TSRFCC riser reactors were first analyzed. The simulations were then carried out for optimization studies to understand the influence of the operating conditions on the performance of commercial TSRFCC riser reactors. The model and results presented here are valuable for the design and optimization of TSRFCC technology. 相似文献
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基于多目标优化的两段提升管重油催化裂解自优化控制 总被引:1,自引:1,他引:0
针对两段提升管重油催化裂解过程经济运行要求和工艺特点,从多目标优化角度出发,提出一种自优化控制方法。首先,基于过程稳态模型,考虑操作约束条件,构造同时最大化丙烯产量和最小化干气产量的多目标操作优化问题,并采用标准化法向约束方法求解获得完整、均匀分布的Pareto最优解;然后,根据多目标优化结果所揭示的最优操作条件与积极约束之间的关系,提出了一种基于串级控制的自优化控制策略。仿真结果表明,与传统的提升管出口温度设定值跟踪控制相比,本文方法在干扰作用下能够及时调整操作条件,降低干扰对过程优化运行的不利影响。 相似文献
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