凝结水过冷度对火电机组热经济性影响的计算模型

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.     

考虑生态效应的能量系统三重优化分析方法

作者在现有热经济学中的能量成本方程中加入总环保费用一项,从而对于生态效应的考虑能够实现热经济学上的定量分析。并在此基础上提出能量系统的三重优化分析方法。     

Various criteria in optimization of a geothermal air conditioning system with a horizontal ground heat exchanger

Thermodynamic and thermoeconomic optimization of a horizontal geothermal air conditioning system has been performed. A model based on energy and exergy analysis is presented here. An economic model of the system is developed according to the Total Revenue Requirement (TRR) method. The objective functions based on the thermodynamic and thermoeconomic analysis are developed. An artificial intelligence technique known as evolutionary algorithm has been utilized for optimization. This approach has been applied to minimize either the total levelized cost of the system product or the exergy destruction of the system. Three levels of optimization including thermodynamic single objective optimization, thermoeconomic single objective optimization and multi‐objective optimization (with simultaneous optimization of thermodynamic and thermoeconomic objectives) are performed. In multi‐objective optimization, both thermodynamics and thermoeconomic objectives are considered, simultaneously. In the case of multi‐objective optimization, an example of decision‐making process for selection of the final solution from available optimal points on Pareto front is presented here. The results obtained using the various optimization approaches are compared and discussed. Copyright © 2009 John Wiley & Sons, Ltd.     

网络热力学的建模方法

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。     

MSF海水淡化系统热经济学优化分析

热经济学理论和方法在能量系统分析中占有重要地位。本文以年度化平均淡水成本为目标函数,对ＭＳＦ海水淡系统建立了较完善的优化模型。并就国产化日产３０００吨ＭＳＦ海水淡化系统进行了较详细的浮动价格结构下的优化设计分析。     

(火用)经济学的发展及应用

综述了火用经济学的发展历程。详细介绍了火用经济学的最新发展——结构理论的研究,并论述了应用结构理论进行火用经济学分析的优点。介绍了当前火用经济学在我国的研究状况。对今后应探索的研究方向提出了建议。     

Effect of combustion on the economic operation of endoreversible otto and Joule–Brayton engine

To simplify analysis of an internal combustion engine, air-standard cycles are conceived. Air is assumed to behave like an ideal gas. In practice, air-standard analysis provides useful indication of the trends that the engine is likely to follow. Air-standard Otto and Joule–Brayton cycles are bona fide assumption and cannot represent the complex combustion process occurring in the internal combustion engines. In this paper, the complex combustion process is represented by a parameter called fuel-flame temperature. The effect of combustion on the thermoeconomic performances of Otto and Joule–Brayton engines are studied. It is observed that the efficiency at maximum power is less than the Curzon–Ahlborn efficiency. The economic performance of the engine deteriorates due to combustion. The efficiency of the engine corresponds to maximum specific-power output, depends not only on the fuel-flame temperature, but also on the specific heats of the air and fuel. Ideal gas assumption of the working fluid is relaxed in this paper. Although somewhat idealized, the effect of combustion on the performance and economics of the internal combustion engines gives a reasonable design goal and better understanding of the real-heat engine. © 1998 John Wiley & Sons, Ltd.     

锅炉热经济性的诊断模型

提出了锅炉热经济性诊断模型，它能有效地分离锅炉的热经济性故障，通过合理的选择参照基准可以使热平衡计算方法更加严密，更适合于在线监测，该模型可对火电厂的煤质进行实时监督，有利于提高火电厂能源管理水平，图1参5。     

蒸汽管道的热经济学设计分析

分析了蒸汽管道的热损失和(火用)损失随管径的变化趋势,并结合经济分析提出了优化管道设计的方法,进而导出了热经济学直径和保温层厚度计算式。     

Influence of the heat recovery steam generator design parameters on the thermoeconomic performances of combined cycle gas turbine power plants

This paper proposes a methodology to identify the most relevant design parameters that impact on the thermal efficiency and the economic results of combined cycle gas turbine power plants. The analysis focuses on the heat recovery steam generator (HRSG) design and more specifically on those operating parameters that have a direct influence on the economic results of the power plant. These results are obtained both at full and part load conditions using a dedicated code capable of simulating a wide number of different plant configurations. Two different thermoeconomic models aimed to select the best design point are proposed and compared: the first one analyzes the generating cost of the energy while the second one analyzes the annual cash flow of the plant. Their objective is to determine whether an increase in the investment in order to improve the thermal efficiency is worth from an economic point of view. Both models and the different HRSG configurations analysed are compared in the results section. Some parametric analysis show how the design parameters might be varied in order to improve the power plant efficiency or the economic results. Copyright © 2004 John Wiley & Sons, Ltd.