共查询到19条相似文献,搜索用时 218 毫秒
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等效热降理论应用广泛,已成为火电厂热力系统热经济性诊断的重要方法.适用于再热机组的定热量等效热降的分析原则和计算结果,经实践证明是完全正确的,但定热量等效热降无法独立完成机组热力系统整体计算.针对这一问题,提出了以简化的迭代计算模型对定热量等效热降进行了改进,适合于计算机编程实现,从而使定热量等效热降也能独立地计算出装置效率.以200MW再热机组为例进行了算例分析,验证了该方法的正确性. 相似文献
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基于热力系统汽水分布通用矩阵方程,通过严密的数学推导,导出了定流量条件下凝结水过冷度对机组热经 济性的计算模型.该计算模型针对不同末级加热器型式及其疏水方式进行了讨论,并给出了具体的数学表达式,为火电机组节能降耗以及热力系统定量分析提供了理论工具.通过算例分析,表明应用该模型在对电厂进行经济性分析时快速、准确.该模型具有较强的通用性,在电厂热经济性的在线监测系统中有较好的应用价值. 相似文献
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研究和分析加热器经济性指标与运行工况的关系、更好地掌握加热器系统特征、提高系统的运行水平是提高机组经济性和安全性的关键。运用基于热力学第一定律的等效焓降法和基于热力学第二定律的分析法对加热器系统特征进行分析研究。等效焓降理论热力系统热经济性计算的通用矩阵方程能有效克服热经济性矩阵分析方法需要联立其它方程才能求解热力系统最终热经济性指标的缺陷。分析法为评价能量转换的"量"和"质"提供了统一的尺度。综合考虑上述方法,分析加热器系统特征,为准确评价热力系统的热经济性提供依据。 相似文献
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基于有效热降理论的热力系统热经济性计算通用矩阵方程,能有效克服热经济性矩阵分析方法需要联立其它方程才能求解热力系统最终热经济性指标的缺陷,并将其应用到回热系统中。得出在机组负荷偏离额定负荷运行时,系统效率的变化情况。研究和分析加热器的经济性指标与运行工况的关系,更好地掌握加热器系统特征和提高系统的运行水平,是提高机组的经济性和安全性的关键。 相似文献
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等效焓降扩展算法的比较和联合应用 总被引:3,自引:0,他引:3
等效焓降法用于分析热力系统、计算热经济性指标时,十分简便、迅速,而且运算结果准确,所以应用也很广泛。面对热力系统中不同的问题和要求,我国学者在等效焓降法的基础上,提出了很多不同的改进算法。与等效焓降法相比,它们在具体问题和要求上更有针对性。对其中的部分算法进行分析和比较,并得出一个改进的等效抽汽法的计算模型,最后给出一个运用这个方法的算例。 相似文献
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以常规热平衡方法为基础,经过严格的数学推导,首次将等效热降理论应用于供热机组热力系统循环吸热量的计算,并提出了适用于不同类型供热机组热力系统的通用数学计算模型.经实例验证,该数学模型简捷、准确,将为不同类型供热机组热力系统热经济性的定量计算和热电联产总热耗量合理分配的研究奠定良好基础. 相似文献
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Exergoeconomic analysis and optimization of combined heat and power production: A review 总被引:1,自引:0,他引:1
Exergoeconomics is also called thermoeconomics, and thermoeconomic analysis methodologies combine economic and thermodynamic analysis by applying the cost concept to exergy which accounts for the quality of energy. The main concept of thermoeconomics is the exergetic cost and it deals with cost accounting methods. This paper is a review on the exergoeconomic analysis and optimization of combined heat and power production (CHPP). A brief historical overview on the exergoeconomics analysis and optimization is given. The concept of exergetic cost and cost accounting methods are discussed. An application of relevant formulation is given using a diesel engine powered cogeneration system as an example. Main thermoeconomic methodologies available in literature are described and their advantages and disadvantages with respect to one another are compared and discussed through a well-known problem, namely CGAM. Important studies on thermoeconomic analysis and optimization of combined heat and power production are listed based on the methodology used and the type of system considered. 相似文献
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肖国俊 《能源技术(上海)》2007,28(5):257-261
通过对各种不同热力系统结构的深入分析,并对热力系统可能出现的辅助汽水系统、外加热量和辅助设备的灵活处理,建立了一种热力系统计算通用矩阵模型。该模型能够针对不同复杂的热力系统进行迅速准确的计算,具有很好的通用性。 相似文献
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通过对各种不同热力系统结构的深入分析,并针对热力系统可能出现的辅助汽水系统、外加热量和辅助设备进行灵活处理,建立了一种热力系统计算通用矩阵模型。该模型能够针对不同复杂的热力系统进行迅速准确的计算,具有很好的通用性。 相似文献
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《Energy》1986,11(10):957-967
We present the application of thermoeconomics to the optimization of a single-stage heat-pump cycle. The method is well suited for application to thermodynamic processes and yields exergy losses. The marginal cost of an arbitrary variable can also be calculated. The efficiencies of the compressor, condenser, evaporator, and electric motor are chosen as the decision variables which are to be optimized. Parameters such as the price of electricity and the temperature of the delivered heat may vary among optimizations, and results are presented for different parameter values. 相似文献
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On the thermoeconomic approach to the diagnosis of energy system malfunctions: Part 1: the TADEUS problem 总被引:2,自引:0,他引:2
Antonio Valero Luis Correas Alejandro Zaleta Andrea Lazzaretto Vittorio Verda Mauro Reini Victor Rangel 《Energy》2004,29(12-15):1875
This work is the first part of a wider project aiming at demonstrating the capabilities offered by the thermoeconomic approach to the diagnosis of malfunctions in energy utility systems (TADEUS problem). The final goal is to create a common basis of work for people interested in applying thermoeconomics to identify malfunctions and to evaluate their effects on the overall plant performance. The main issues to be addressed when performing a diagnosis of energy system malfunctions using a thermoeconomic approach are summarized. A combined cycle power plant is proposed to demonstrate the practical feasibility of the thermoeconomic approach. An overview of its operation characteristics, thermodynamic design properties and control strategy is given in Part 1, and a comprehensive model is described for further use as common basis to illustrate the various diagnosis approaches either by the authors or third parties. Possible component malfunctions and main theoretical aspects of the thermoeconomic approach are presented in Part 2. The paper shows at which level of detail the analysis of physical and technical characteristics of the plant should be performed, how to develop a design and off-design model suitable for malfunction analysis, how to analyse and define component malfunctions and how to interpret and use thermoeconomic variables and indexes. 相似文献
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为进行热经济学的能量系统兼顾生态环境的第三层次优化,引入了网络热力学建模,进而形成了一种热经济学的新模式——网络模式。简要回顾网络热力学的起源和发展,提出了网络热力学的建模理论和方法。进行了某生态系统的网络热力学方法分析,表明网络热力学可把许多复杂问题转化为非电问题的电气网络,实现了复杂问题的描述离散化,最终演化成矩阵分析的简洁处理。因而,网络模式热经济学不但扩大了网络热力学的运用范围和规模,而且顺应了计算机发展的新形势,网络热力学必将成为分析各种复杂的包括生态系统在内的物理与工程系统的强有力的通用工具。 相似文献