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The results indicate that CCLC has the advantage in recuperating exergy from flue gas, but it cannot sufficiently convert the recuperated exergy to useful work.


Possible phosphorus production flowsheet solutions are obtained, which allow one to increase the energy and exergy efficiency of the system using specially developed software.


Thermodynamic analysis yields criteria for the enthalpy change of formation of substances from oxides and the entropy and exergy of cement raw material mixes in burning.


Exergy analysis of thermal processes in the building materials industry


A method is proposed to calculate the chemical exergy with allowance for the chemical composition and the ambient temperature.

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 In this paper, the "exergy coefficient" and the "exergy efficiency" η. are proposed as: where Q1 is the heat collected by solar collector, △E is the useful energy included in Q1, η is the "collector efficiency" Then =1 and η are approximately presented as a linear function of temperature T, such as η=k,(t2  a), and k2(t2  b). So ηe is a parabolic function and it exists a maximum exergy efficiency ηemax= k1k2 and the corresponding optimum operation temperature would be t2,opt =a+b/2... In this paper, the "exergy coefficient" and the "exergy efficiency" η. are proposed as: where Q1 is the heat collected by solar collector, △E is the useful energy included in Q1, η is the "collector efficiency" Then =1 and η are approximately presented as a linear function of temperature T, such as η=k,(t2  a), and k2(t2  b). So ηe is a parabolic function and it exists a maximum exergy efficiency ηemax= k1k2 and the corresponding optimum operation temperature would be t2,opt =a+b/2 It is shown that the method proposed can used to predict the optimum operation temperature. It is suggested that it may be used as the target for selecting collector and optimizing solar power system.  本文提出系数其中： Ｑ１－太阳能集热器所收集的热量 △Ｅ－在Ｑ１中的“可用能” η－集热器效率 对η可分别近似表示为Ｔ的线性函数，如η＝Ｋ１（Ｔ２－ａ）和＝ｋ２（ｋ２－ｂ）；则ηｅ是一条抛物线，并存在着最大的效率ηｅｍａｘ＝｜ｋ１ｋ２｜（ａ－ｂ）２／４，相应的最佳运行温度是 ｔ２，ｏｐｔ＝ １／２（ａ＋ｂ）。 由本文提供的分析计算方法，可以迅速确定最佳运行温度。建议可以用这种方法作为选择集热器及太阳能动力系统的一种指标。  In this paper, the author is attempting to solve the thermalengineering problems by the exergetic method as follows:1. First of all, four more definite and clearer definitions of exergetic efficiency are presented. Then, separate definitions of reasonable exergetic efficiency are also given for the different kinds of thermalengineering equipments for different uses.2. Emphasis is placed on the analysis of exergy of steady flow process with perfect gas as the working substance. From such an analysis, it... In this paper, the author is attempting to solve the thermalengineering problems by the exergetic method as follows:1. First of all, four more definite and clearer definitions of exergetic efficiency are presented. Then, separate definitions of reasonable exergetic efficiency are also given for the different kinds of thermalengineering equipments for different uses.2. Emphasis is placed on the analysis of exergy of steady flow process with perfect gas as the working substance. From such an analysis, it is shown that the exergy of a steady flow process of perfect gas can be divided into two different kinds of capabilities of work exclusive of the constant  zero exergy e0, which characterizes difference of mass transported between the steady flow and the surrounding medium. Now that the steady flow process in a fluid machine with perfect gas as the working substance can be described by stagnation enthalpy exergy ei* and stagnation pressure exergy ep* instead of stagnation enthalpy i* and stagnation pressure p*. And that two different kinds of capability of work can be distinguished and eventually a further development of exergetic analysis can be brought about.3. The objective function of the malengineering equipment is so depicted by the exergetic efficiency as to examine whether more reasonable result can be made otherwise with the traditional approach of analysis through its objective functionthermal efficiency. According to the author, that will depend on the coherence of variation of exergetic efficiency against the parameter analysed with that of thermal efficiency. As the coherence does not appear, the more reasonable result can be obtained. Otherwise, that will never be obtained.4. Referring to the exergetic analysis of weak part where improvement must best be made, it carried out by use of an example, it is shown that the weak part can only be determined correctly in virtue of the following approaches:(1) By comparing the magnitudes of exergy losses for various parts in a given equipment.(2) By comparing the magnitudes of exergy losses at the same part of different kinds, of thermalengineering equipments.(3) By rigorously distinguishing two different kinds of exergy losses i.e. stagnation enthalpy exergy losses and stagnation pressure exergy losses.  本文在热工问题的(火用)分析方面作了下列各项工作: 1.提出了四种工程意义明确而又严密的(火用)效率定义,并分别对各种具体情况提出了各类热工设备的合理的(火用)效率定义。 2.对高速稳定流动的理想气体工质的作功能力(总(火用)e~*),进行了分析,分析指出除常数零(火用)e_0外,总(火用)e~*系由两类不同质的作功能力所组成,由此引入了两个新概念:总焓(火用)e_i*和总压(火用)e_p*。由于新概念的引入,就区分了两类不同质的作功能力,这是热工问题(火用)分析的一个新发展。 3.指出了用(火用)分析法进行热工设备的最优分析,能否得到比热效率法更为合理的结果,这需视两种分析法的目标函数随分析对象的变化是否一致而定。 4.关于薄弱环节(火用)分析,本文指出了薄弱环节的确定,不仅需要进行纵的比较,而且还需要进行横的比较,也要注意区分两类不同质的作功能力((火用))的损失。  This paper deals with the differences of opinions between the author of "Exergy & Exergy Analysis" [1] and the authors of the present paper in determining the optimum enthalpy of feed water in a steam power circulation. The author of paper [1] holds the view that the optimum enthalpy of the feed water obtained from exergy analysis is lower than that from conventional enthalpy analysis. So, according to the conclusion of exergy analysis, it is better to take the lower enthalpy of the feed water The... This paper deals with the differences of opinions between the author of "Exergy & Exergy Analysis" [1] and the authors of the present paper in determining the optimum enthalpy of feed water in a steam power circulation. The author of paper [1] holds the view that the optimum enthalpy of the feed water obtained from exergy analysis is lower than that from conventional enthalpy analysis. So, according to the conclusion of exergy analysis, it is better to take the lower enthalpy of the feed water The method of enthalpy analysis and that of exergy analysis are both employed in this paper to discuss the same problem and we arrived at a conclusion that, to the same kind of steam power circulation operating at the same condition, no matter whether the method by exergy analysis or enthalpy analysis we used to find the optimum parameter, the conclusion is just the same. There is no question of one being better than the other. We would like to also point out the reason here why the author of paper [1] arrived at the undefined conclusion.  本文就“与分析”一文中有关蒸汽动力循环中确定最优给水焓值的讨论持有不同的看法。[1]文认为对于抽汽回热给水蒸汽动力循环来讲,“(火用)分析得到的最优给水焓值i_(sn),要比传统的焓分析得到的值低。所以根据(火用)分析的结果,可以选取更为合理的给水焓值。”为此本文用焓分析及(火用)分析的方法探讨了该问题。结论是:对同类型的蒸汽动力循环来讲,在相同的前提下,无论用(火用)分析还是用焓分析寻求最佳参数时,结论是一致的,不存在何者更为合理的问题。且指出了[1]文之所以得到这一不确切结论的根由。   << 更多相关文摘 
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