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It is simple for the structural types of the spiral heat exchangers, but if a designer desires to know well about it's features all the time in many engineering applications, and could work out the spiral heat exchangers which have good performances, its necessary for him to further research some relative problems. This article has a primary discussion about the problems which deal with the common and special structural designs of the spiral heat exchangers, so that readers maybe refer to it. 虽然螺旋板换热器结构形式简单,但在众多的工程应用场合,设计者若想始终把握其特点,设计出性能良好的螺旋板换热器,有必要对其有关问题作深入地探讨。本文就螺旋板换热器一般结构设计及特殊结构设计中的一些具体问题作了初步探讨,以供读者参考。 This article introduces summarily the content and method about the study of applicability super - low - carbon duplex stainless steel tube, as engineering material so as to attract wide attention and to expand the application area and product market of numerous engineering materials produced by our institute. Investigation has proved that this material has good corrosion resistance and can resist stress - corrosion cracking so that in can be applied to a variety of corrosion - proof engineering components and... This article introduces summarily the content and method about the study of applicability super - low - carbon duplex stainless steel tube, as engineering material so as to attract wide attention and to expand the application area and product market of numerous engineering materials produced by our institute. Investigation has proved that this material has good corrosion resistance and can resist stress - corrosion cracking so that in can be applied to a variety of corrosion - proof engineering components and high - pressure corrosion - resistant tube materials. 本文概要介绍超低碳双相耐蚀不锈钢管工程材料的适用性研究的内容和方法,以期引起广泛的重视,为开拓我所众多工程材料应用领域和产品市场服务。研究证明该材料具有良好的耐蚀性和耐应力腐蚀开裂性能,可应用于各种耐蚀工程构件和高压耐蚀管材。 Rapid development of artificial intelligence techniques provides methods to solve the complex problems of system optimization. This paper is about how to utilize neural network (NN), genetic algorithm (GA) and expert system (ES) to solve complex optimization problems in process systems. With its great nonlinear mapping ability, neural network is suitable for modeling of largescale complex systems. But this kind of model is of blackbox, and its solution cannot be obtained by MP. In this regard, GA takes advantage.... Rapid development of artificial intelligence techniques provides methods to solve the complex problems of system optimization. This paper is about how to utilize neural network (NN), genetic algorithm (GA) and expert system (ES) to solve complex optimization problems in process systems. With its great nonlinear mapping ability, neural network is suitable for modeling of largescale complex systems. But this kind of model is of blackbox, and its solution cannot be obtained by MP. In this regard, GA takes advantage. For optimization based on a lot of knowledge from experience, ES can be used. 研究了集成应用神经网络、遗传算法和专家系统技术来解决过程系统的复杂优化问题.由于神经网络的高度非线性映射能力,适合于大型复杂问题的建模.神经网络建立的是一个黑箱模型,不能用传统的数学规划方法求最优解,遗传算法适合于这种模型的寻优.有些复杂工程问题的优化,并非建立一个模型(数学模型或神经网络模型)求解就可以得到答案,而是依靠众多的工程因素和经验,对于这种优化问题,专家系统显示出突出的优势
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