共查询到20条相似文献,搜索用时 171 毫秒
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在全世界范围内已实现工业化生产的煤气化技术中,只有壳牌煤气化技术采用了激冷流程,由于该工艺在节能减排降本增效方面突出的优势,未来其他新型煤气化技术也存在采用此工艺的可能。分析和论述了以壳牌煤气化技术为代表的粉煤气化技术(激冷流程)的优势及其广阔的应用前景,着重对目前壳牌煤气化装置循环气压缩机的布置进行分析,对比国内现行的防火设计规范,论证了现有循环气压缩机的布置方案是满足国内现行设计规范要求的,为未来中国其他采用激冷流程的新型煤气化工艺的研究与发展奠定坚实的理论基础。 相似文献
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阐述Shell煤气化工艺中粗煤气激冷流程,激冷气的作用,激冷气流程主要设备激冷气压缩机及启动步骤进行简介,Shell气化炉运行过程中实际遇到问题的浅析。 相似文献
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对煤化工激冷罐锥体的成形加工工艺过程进行了详细的阐述。激冷罐锥体材料采用Cr-Mo钢复合板。由于锥体壁较厚且工况苛刻,因此制造难度较大。该厚壁锥体的制造成功,为采用Cr-Mo钢复合板厚板制造压力容器和其他化工设备提供了可借鉴的经验。 相似文献
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A. Wix K. Schaber O. Ofenloch R. Ehrig P. Deuflhard 《Chemical Engineering Communications》2007,194(4):565-577
In gas-liquid contact devices like absorbers, quench coolers, or condensers, aerosols can be formed by spontaneous phase transitions, initiated by homogeneous or heterogeneous nucleation, if a supersaturated gas phase emerges due to simultaneous heat and mass transfer processes or chemical reactions. Typical examples are the absorption of acid gases, like HCl or SO3, the condensation of solvents in the presence of inert gases, and the humidification of cold gases by hot liquids.
In this article the basic principles of aerosol formation in contact devices are briefly described. A strategy for modeling and simulation of aerosol formation and particle dynamics is discussed. Simulation results generated with the process tool AerCoDe for the countercurrent absorption of HCl and the humidification of air are presented. 相似文献
In this article the basic principles of aerosol formation in contact devices are briefly described. A strategy for modeling and simulation of aerosol formation and particle dynamics is discussed. Simulation results generated with the process tool AerCoDe for the countercurrent absorption of HCl and the humidification of air are presented. 相似文献
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A. Wix K. Schaber O. Ofenloch R. Ehrig P. Deuflhard 《Chemical Engineering Communications》2013,200(4):565-577
In gas-liquid contact devices like absorbers, quench coolers, or condensers, aerosols can be formed by spontaneous phase transitions, initiated by homogeneous or heterogeneous nucleation, if a supersaturated gas phase emerges due to simultaneous heat and mass transfer processes or chemical reactions. Typical examples are the absorption of acid gases, like HCl or SO3, the condensation of solvents in the presence of inert gases, and the humidification of cold gases by hot liquids. In this article the basic principles of aerosol formation in contact devices are briefly described. A strategy for modeling and simulation of aerosol formation and particle dynamics is discussed. Simulation results generated with the process tool AerCoDe for the countercurrent absorption of HCl and the humidification of air are presented. 相似文献
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乙烯装置急冷油系统存在问题的分析 总被引:5,自引:2,他引:5
某些乙烯装置的急冷油系统操作数据与设计数据偏离较远,说明设计上存在问题,应从工艺流程设计和模拟计算入手,找到准确的设计方法。 相似文献
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Cooling is a critical step in any crystalline polymer molding or extrusion process. A simulation is proposed which will predict the transient temperature and crystallinity profiles developed when a finite polymeric slab comes in contact with a cooling fluid. A generalized, phenomenological model of the crystallization kinetics of polymers is incorporated to account for the effect of the latent heat of crystallization on the thermal history as well as on the crystalline structure at any point in the slab. The model assumes heterogeneous nucleation and temperature-dependent radial growth of spherulites. DSC cooling thermograms for the polymer are used to verify the kinetic model for comparing experimental measurements against simulated results. Observed spherulite sizes should also be matched by the simulation. Kinetic data have been obtained for two grades of poly(ethylene terephthalate) which have the same growth rate expression but different nucleation characteristics. Crystallinity of these two polymers decreases rapidly as either quench temperatures or nucleation densities are decreased independently. Calculations have been carried out for 1/16 in. thick sheets of polymer exposed to a cooling medium with a heat transfer coefficient of 100 Btu/hr/ft2/°F. Temperature gradients are also presented. The simulation can be used for optimizing quench conditions in polyester film extrusion. 相似文献
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Enameled utensils were tested for thermal-shock resistance by heating in an oven to a predetermined temperature, then quenching with iced water. This process was repeated, following a schedule of successively higher temperatures from 375° to 600°F. until the specimens chipped or withstood heating after the tenth quench. The method is suitable for testing most sizes and shapes of utensils. Data on a wide variety of commercial utensils are included. Photographs show that failures originate in cracks formed during quenching from stresses produced by rapid cooling and shrinking of the surface of the enamel. The chips are usually blown off with considerable force during heating following the quench by steam produced from water which penetrated the cracks during the quench. Evidence is presented that deformation of the pan bottom during heating does not produce thermal shock failures. 相似文献
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Pyrolysis products from industrial cracking furnaces are commonly quenched indirectly in transfer line heat exchangers (TLX). To assess the performance of a TLX for a high severity furnace, a rigorous computer simulation of a TLX tube has been developed. The primary objective was to determine whether this method of indirect quenching can provide the extremely small quench times required for fast ultrapyrolysis reactions. Results indicate that extremely small quench times of approximately 10–15 ms can be achieved, typically dropping the temperature from 1100 to 900K. The model takes into account the effect of the thermal entrance region on heat transfer characteristics and can employ either a 10 equation molecular reaction scheme or an 80 equation radical reaction scheme for propane pyrolysis. The effects of adjusting the main process variables and of coke deposition on quenching performance are also discussed. 相似文献
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Belabbas Abou Bakr Tariq Walid Benyounes Hassiba Haddou Boumediene Shen Weifeng 《化学工程与技术》2018,41(10):2043-2052
Current studies are devoted to promote the production yield of the methanol synthesis process for treating large feed capacities in Algerian methanol manufacture industry by designing new reactor technologies. In order to achieve a high yield of methanol, the performance of methanol synthesis is improved by substituting the quench reactor by a new Lurgi reactor. The design of operating parameters of the Lurgi reactor involves the effect of CO2 injection on methanol production yield and the catalyst deactivation. The simulation results demonstrate that under the same industrial operating conditions the conversion rate of reactants increases from 23 % in the quench reactor to 37 % in the Lurgi reactor and the methanol yield can be increased by 33 % when substituting the quench reactor by the Lurgi reactor 相似文献
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Criteria for identification of the unstable or stable nature of the steady state based on the reactor temperature response to step changes in feed temperature, and a dynamic thermal simulation of SRC-II reactors are developed. These are used in the analysis of a dynamic SRC-II reactor experiment to confirm its unstable operation under normal process conditions. The simulation is used further to study the sensitivity of reactor temperature to changes in feed temperature and to variations in the total heat capacity of the reactor vessel and insulation materials. It is shown that, under normal SRC-II process conditions, it would take about an hour for the reactor temperature to change by ± 10°C, if no controls were used. With quench gas manipulation, the reactor temperature could be maintained within ± 1°C even for a sustained small perturbation in the process conditions. Therefore, in spite of its unstable character, the SRC-II reactors can be readily operated with quench gas manipulation without incurring any major temperature control problems. 相似文献