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石油资源在利用过程中形成环境污染,通过将油品和催化剂有效结合,使轻汽油达到高产,促使催化裂化装置设施及有关工艺配套技术得以飞速进步。从实际出发,对催化裂化工艺原理进行介绍,并探讨催化裂化工艺技术与催化裂化催化剂技术的进展。 相似文献
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结合催化裂化催化剂的基本组成以及性能指标,指出当今催化裂化技术发展面临的新形势,同时介绍了重油催化裂化发展的新趋势:(1)优化分子筛孔结构与酸性;(2)改善焦炭选择性;(3)增强抗重金属污染能力;(4)个性催化剂的开发。 相似文献
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催化剂小型加料器可根据催化裂化装置生产工艺的要求,分批定时和定量地进行加料。它与人工操作相比,不仅能够提高装置操作的稳定性,而且能降低催化剂的损耗。 相似文献
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论文介绍了催化裂化催化剂的研究进展。多种新催化材料引入催化剂中,使重油转化催化剂得到了广泛的应用;降低汽油烯烃含量和硫含量催化剂的开发取得了实质进展;受日益增长的丙烯市场需求影响,裂化催化剂对丙烯和液化石油气的选择性有了显著提高;提高清洁汽油辛烷值的裂化催化剂以及减少催化裂化装置烟气污染排放的催化剂和助剂成为研发的热点;催化剂低成本和清洁生产技术正日益受到重视和发展。由于新型重油裂化催化剂的不断涌现,多功能化成为催化裂化催化剂发展的趋势。 相似文献
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本文从催化剂、原料油、设备等方面分析了催化裂化装置催化剂跑损的原因。其中催化剂方面主要包括催化剂的粒径分布、耐磨性能、抗金属污染能力和水热稳定性,原料油方面主要包括原料油的烃类组成和金属含量,设备方面主要包括进料喷嘴的型式、提升管出口分布板的型式、旋风分离器的运行状况以及再生器的运行状况。另外操作条件的剧烈波动也会造成催化剂跑损。催化剂跑损不仅会增加催化剂的消耗量,而且会给装置的平稳运行带来一定的影响,在生产过程中应当特别关注。 相似文献
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利用XTL-5 型提升管中试装置, 对抗钒催化裂化催化剂CHV-1、 LV-23 及进口剂的裂化性能进行了评价。结果表明, 三种催化剂均具有较强的抗钒性能, 催化剂上的钒含量为4100μg/g 时,催化剂活性仍保持在67 以上。国产抗钒催化裂化催化剂LV-23 与进口催化剂裂化性能水平相当。对于洛阳石油化工总厂炼油厂常压渣油, 按多产液化气方案可选用CHV-1; 按多产汽油方案可选用LV-23, 均能取得较好的效果。 相似文献
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分析了催化裂化催化剂喷雾干燥尾气热风的相对湿度;在催化裂化催化剂喷雾干燥生产过程中,采用热风再循环技术;比较不同循环比下的热效率和节能效果,优化操作参数;喷雾干燥热风再循环技术提高了装置的热效率,节能效果明显。 相似文献
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Louise Emy Kurozawa Alexandre Gomes Morassi Analia Aparecida Vanzo Kil Jin Park Miriam Dupas Hubinger 《Drying Technology》2013,31(11):1248-1257
The influence of spray-drying conditions on the physicochemical properties of chicken meat hydrolysate powder was studied in this work. Enzymatic reaction, using Alcalase® (Novozymes, Bagsvaerd, Denmark), was carried out at 52.5°C, 4.2 g enzyme/100 g protein, and pH of 8.0 to obtain protein hydrolysate. The spray drying was carried out on a laboratory spray dryer and maltodextrin 10DE was used as carrier agent. A central composite rotatable design was used to evaluate the effect of the independent variables inlet air temperature, feed flow, and maltodextrin concentration on the responses powder moisture content, bulk density, mean particle diameter, and hygroscopicity. All variables had a significant effect on the properties and morphology of protein hydrolysate powder. 相似文献
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There have been several efforts to simulate the physical processes in a single droplet during spray drying in the last several years, but most of the models do not describe the solid formation in detail. In this work, the development of the microscopic solid structure in a droplet during spray drying is simulated. A radial-symmetric model of the droplet is used to simulate the mass and heat transport. The solid formation at every radial discretization point is obtained by the solution of population balances. This way, the distribution of the particle number density in the droplet depending on the macroscopic process parameters can be predicted. The model equations are solved in a normalized coordinate system to be able to describe the shrinkage of the droplet. The suitability of these population balances will also be discussed. For the validation, monodisperse single droplets consisting of a solution or suspension are dried with constant boundary conditions. 相似文献
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There have been several efforts to simulate the physical processes in a single droplet during spray drying in the last several years, but most of the models do not describe the solid formation in detail. In this work, the development of the microscopic solid structure in a droplet during spray drying is simulated. A radial-symmetric model of the droplet is used to simulate the mass and heat transport. The solid formation at every radial discretization point is obtained by the solution of population balances. This way, the distribution of the particle number density in the droplet depending on the macroscopic process parameters can be predicted. The model equations are solved in a normalized coordinate system to be able to describe the shrinkage of the droplet. The suitability of these population balances will also be discussed. For the validation, monodisperse single droplets consisting of a solution or suspension are dried with constant boundary conditions. 相似文献
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我国南北方相对湿度差别较大。相对湿度大会给喷雾干燥生产带来不利影响,如生产时进风温度偏低、塔壁挂粉严重、产品水分含量超标、生产效率降低等。相对湿度是设计喷雾干燥系统的重要参数。设计喷雾干燥系统应对不同地区环境的相对湿度情况区别对待。以RGYP01-500型立式压力喷雾干燥塔生产奶粉为例,对喷雾干燥系统的设计进行阐述。 相似文献
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