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介绍了三元催化转化器的结构及工作原理,论述了目前开发出的催化转化器的各种数学模型,包括温度模型,二维模型,多维模型,及动力学模型等。对今后催化转化器数学模型的研究方向做了展望。 相似文献
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A model consisting of three partial non-linear differential equations for describing the humidity and temperature of a thin sheet of material and of the temperature of the air flow as a function of time and position in an infrared dryer was reduced to a model more adaptable to direct digital control. To begin with the original model was discretized along the length of the dryer and then linearized. Models of orders ranging from 12 to 72 were analyzed for controllability and observability. Using Moore's method, the models thus obtained were further reduced to a controllable state space model of order 5 that produced satisfactory results and for which stability was preserved. Simulated open loop responses of the reduced model to discrete perturbations in emitter electrical power, inlet humidity and velocity of the web, produced satisfactory dynamic and steady-state responses when compared to responses of the original model subjected to similar perturbations. The steady-state responses showed absolute errors for humidity and temperature of the web less than 1.3% [g water/100 g] and 2.2°C, respectively. 相似文献
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电解质NRTL模型的发展及应用 总被引:1,自引:0,他引:1
综述了电解质NRTL模型从最初的用于处理单一电解质、单一溶剂体系的两贡献模型发展成为能处理多电解质组分、混合溶剂体系的热力学模型,介绍了模型在电解质溶液相平衡计算中的应用。最后指出了此模型的优缺点和模型参数的发展方向。 相似文献
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电解质NRTL模型的研究进展及应用 总被引:1,自引:0,他引:1
电解质NRTL模型是重要的热力学局部组成模型。本文阐述了电解质NRTL模型的研究进展过程,包括模型的提出、修正、改进和扩展,同时指出了不同模型的适用范围。介绍了模型在各种复杂电解质溶液体系关联计算中的应用,可以为一些工业生产过程的模拟、设计和优化提供理论指导。电解质NRTL模型的主要优势是适用的温度和浓度范围宽,不需二元以上高阶参数;但模型自身也存在缺陷,如参数的回归工作量大、在溶液体系临界点处的预测精度较差等,故模型仍需进一步完善。 相似文献
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Pramil C. Deb 《Polymer》2007,48(17):4932-4935
Method of determination of penultimate model reactivity ratios has been generalized to take care of specific systems where copolymer composition data are available only in narrow ranges. A number of copolymerization systems reported in literature have been analyzed and applicability of generalized relationship was tested. Most systems are seen to follow penultimate model better than the terminal model. Monomer independent universal relationship of penultimate model reactivity ratios has similarly been generalized and successfully tested. 相似文献
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A full two-fluid model of reacting gas-particle flows with an algebraic unified second-order moment turbulence-chemistry model for the turbulent reaction rate of NO formation are used to simulate swirling coal combustion. The sub-models are the k-ε-kp two-phase turbulence model, the EBU-Arrhenius volatile and CO combustion model, the six-flux radiation model, coal devolatilization model and char combustion model. The prediction results are in good agreement with the experimental results taken from references. 相似文献
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间歇精馏模拟及操作方式的研究进展 总被引:2,自引:0,他引:2
综述了间歇精馏模拟研究常用的数学模型,主要介绍了严格模型和简捷模型,简要讨论了各个模型的特点.较详细地介绍了国内外间歇精馏操作方式的研究进展,讨论了动态累积间歇精馏塔、反向间歇精馏塔、中间罐间歇精馏塔、多罐间歇精馏塔等新塔型的操作. 相似文献
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The objective of this work was to model experimental results using the simplest possible mathematical model. Here we report on preliminary results obtained with a one-dimensional model used for parameter-fitting of experimental combustion data with an inlet temperature ramp. It was possible to fit our one-dimensional model with simple power law kinetics to an experimental curve. It was also possible to use a quasi-steady state model with a computing time about a hundred times shorter than for a corresponding transient model. 相似文献
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在牛磺酸/氢氧根相平衡体系下,对计量置换模型、异质作用模型和改进的Langmuir模型的计算精度等特性进行了比较。采用静态法进行牛磺酸/氢氧根体系的离子交换平衡实验,测定30℃下的离子交换等温线;分别使用计量置换模型、异质作用模型和改进的Langmuir模型方程对相平衡数据进行拟合得到相关模型参数。结果表明:改进的Langmuir模型在一定牛磺酸浓度范围内可以正确地描述Tau/OH-体系的相平衡,拟合结果优于计量置换模型和异质作用模型。 相似文献
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This paper combines grey model with time series model and then dynamic model for rapid and in-depth fault prediction in chemical processes. Two combination methods are proposed. In one method, historical data is in-troduced into the grey time series model to predict future trend of measurement values in chemical process. These predicted measurements are then used in the dynamic model to retrieve the change of fault parameters by model based diagnosis algorithm. In another method, historical data is introduced directly into the dynamic model to re-trieve historical fault parameters by model based diagnosis algorithm. These parameters are then predicted by the grey time series model. The two methods are applied to a gravity tank example. The case study demonstrates that the first method is more accurate for fault prediction. 相似文献
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构造模型是三维地质建模的基础,综合钻井、地震解释和地层对比成果资料建立的构造模型反映了三维空间内断层和地层的发育特征。构造模型的质量决定了后续属性模型、储量计算结果乃至动态模型的质量。通过基础数据复查,对断层模型、平面网格、层面模型、垂向网格质量进行控制,实现了构造建模全过程质量控制,提高了构造模型质量。经过海参5潜山构造模型的验证,利用该方法建立的构造模型中断层模型准确反映了断层的空间位置、断层要素及断层之间的相互关系;层面模型综合了地震资料和井对比资料的优点,真实反映了地层发育特征;网格方向、步长参数合理有效,既能够准确反映当前地质认识又提高了模型运算效率。 相似文献
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加氢裂化技术在石化行业中的地位已举足轻重。为深入了解加氢裂化反应规律、优化工业装置运行工艺条件和产品分布,实现炼化企业智能化和效益最大化的目标,科研人员对加氢裂化反应动力学模型做了广泛的研究。对加氢裂化反应动力学模型相关研究及应用进展做了综述,介绍了加氢裂化反应动力学模型研究历程,研究目标从初期简易宏观的关联模型发展为按馏程或其他生产方案需求划分的传统、连续集总模型,再进一步发展为复杂微观的分子集总模型;概述了不同加氢裂化反应动力学模型的应用情况,突出说明了传统集总模型的工业实用性和分子集总模型原料、产品适用性;指出有效地将关联、集总模型(尤其是分子集总)结合利用,开发一种全面的混合动力学模型,将是未来加氢裂化以及其他石油加工过程反应动力学模型研究中极具意义和挑战的工作。 相似文献
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引言实际的工业过程对象,大部分都呈现出很强的非线性特性,其控制过程十分复杂。虽然近年来,对非线性技术的研究已经取得了很多的成果。但是非线性系统精确建模困难[1]、非线性微分方程求解 相似文献