蒸汽喷射泵的yong分析

介绍了蒸汽喷射泵的结构和性能，分析了几种不同的评价方法，并且试用炯的分析方法，构造出该装置的炯流图并进行装置的热力yong经济性分析，在该装置的性能分析计算中尚属首次，该方法简洁、直观、结论正确，最后以某电厂的具体工程运行中的装置为例，对其性能进行了分析，并且比较了改造前的换热器系统性能，为热力系统中的设备、装置的选用提供了理论和现实的依据和实例。     

蒸汽喷射换热泵的分析

简要介绍了蒸汽喷射换热泵的结构和性能 ,分析了几种不同的评价方法 ,并且试用火用分析方法 ,构造出该装置的火用流图并对其进行了热力火用经济性分析 ,最后以某电厂具体工程运行中的装置为例 ,对其性能进行了分析 ,比较了改造前换热器的系统性能 ,为热力系统中的设备、装置的选用提供了理论和现实的依据和实例     

蒸汽喷射换热泵的(火用)分析

简要介绍了蒸汽喷射换热泵的结构和性能,分析了几种不同的评价方法,并且试用炳分析方法,构造出该装置的(火用)流图并对其进行了热力(火用)经济性分析,最后以某电厂具体工程运行中的装置为例,对其性能进行了分析,比较了改造前换热器的系统性能,为热力系统中的设备、装置的选用提供了理论和现实的依据和实例.     

蒸汽喷射换热泵的Yong分析

简要介绍了蒸汽喷射换热泵的结构和性能，分析了几种不同的评价方法。并且试用Yong分析方法，构造出谊装置的Yong流图并对其进行了热力Yong经济性分析。最后以某电厂具体工程运行中的装置为例，对其性能进行了分析，比较了改造前换热器的系统性能。为热力系统中的设备、装置的选用提供了理论和现实的依据和实例。     

热泵回收循环水余热的低真空优化分析

以一台200MW联合循环机组为例,对机组进行低真空与热泵耦合供热技术改造节能分析,得出机组的最佳乏汽背压约为22kPa;此时经济收益最大,可达1128万元;在最佳乏汽背压时,可使机组热化发电率提高60%。同时,进行抽凝工况、低真空工况、低真空耦合热泵工况3种不同供热方式的热力分析,得出,低真空耦合热泵工况时,总效率为65.0%,总热效率为90.2%,总损为205.1×10~6kJ/h,热力性能最好。     

小型风冷热泵节流装置改造的节能研究

对风冷热泵冷热水机组节流装置(热力膨胀阀)进行改进,通过不同试验工况条件下的性能及其各种相关状态参数的测试,比较了系统改进前后的制冷量、能效比和响应时间,验证了使用电子膨胀阀机组能够达到节能的效果,并且提出了改进系统的进一步措施。     

能源、环保文献消息(国内部分)

202001　宝钢ＦＲＣ法煤气脱硫装置的特点朱长光　许善平　《燃料与化工》　2000　Ｎｏ.122～24介绍了宝钢三期ＦＲＣ法焦炉煤气脱硫脱氰工艺流程及工艺特点,指出了该装置投产后生产中的操作要点及其存在问题。202002　热水器新型热交换系统放热和阻力性能分析王为为　荣　红　《煤气与热力》　2000　Ｎｏ.114～17提出强制吸排气、矩形波纹肋椭圆管束、绝热燃烧室构成了热水器的新型热交换系统,并分析其放热及阻力性能。202003　燃气在空调制冷中的应用前景曲世俊　刘　芳　金志刚　《煤气与热力》　2000　Ｎｏ.132～34介绍了燃气吸收式冷温…     

基于单元(火用)分析模型回热系统节能诊断

电厂运行的经济性已经日显重要。回热系统作为电厂热力系统中的主要系统之一,它对全厂的经济运行产生着很大影响,因此,回热系统经济性分析是电厂节能工作中的重要部分。以某热电厂机组的回热系统为研究对象,给出了系统的单元划分方法和通用的单元分析控制体模型,导出了通用的性能评价指标计算式,以实际计算说明了基于单元分析模型的节能潜力诊断方法。该方法可以找出系统能量损失的关键部位,为电厂热力系统节能分析提供一条依据。     

基于单元炯分析模型回热系统节能诊断

电厂运行的经济性已经日显重要。回热系统作为电厂热力系统中的主要系统之一,它对全厂的经济运行产生着很大影响,因此,回热系统经济性分析是电厂节能工作中的重要部分。以某热电厂机组的回热系统为研究对象,给出了系统的单元划分方法和通用的单元炯分析控制体模型,导出了通用的性能评价指标计算式,以实际计算说明了基于单元炯分析模型的节能潜力诊断方法。该方法可以找出系统能量损失的关键部位,为电厂热力系统节能分析提供一条依据。     

AP1000核电厂二回路热力系统离线性能计算软件开发

核电机组二回路热力系统是核电站热经济性的集中体现,对核电机组二回路热力系统进行热力性能计算与分析是核电机组设计和运行中的重要课题。以某典型AP1000机组为例,基于Eclipse开发平台,运用Java语言开发出AP1000核电机组二回路主要设备及系统的离线性能计算与分析软件。通过该软件不仅能够快速直接地完成案例机组在设计工况和变工况下详细的热力计算分析,还可对机组主要热力参数变化时各项性能指标的变化进行快速计算;同时还可建立案例机组的性能档案列表与参数变化图。     

Investigation of coal-fired power plants in Turkey and a case study: Can plant

About 61% of the total installed capacity for electrical power generation in Turkey is provided by thermal resources, while 80% of the total electricity is generated from thermal power plants. Of the total thermal generation, natural gas accounts for 49.2%, followed by coal for 40.65%, and 9.9% for liquid fuel. This study deals with investigation of the Turkish coal-fired power plants, examination of an example plant and rehabilitation of the current plants. Studied plant has a total installed capacity of 2 × 160 MW and has been recently put into operation. It is the first and only circulating fluidized bed power plant in the country. Exergy efficiencies, irreversibilities, and improvement factors of turbine, steam generator and pumps are calculated for plant selected. Comparison between conventional and fluidized bed power plant is made and proposed improving techniques are also given for conventional plants.     

Classification of geothermal resources in Turkey by exergy analysis

The investigations have been directed to technology development in the usage of natural resources as a result of increase in the world energy demand associated with environmental factors. It has also sparked interest in the scientific community to take a closer look at the energy conversion devices and develop the new techniques to better utilise the existing limited sources. Geothermal resources have a great importance for the energy potential in Turkey. Exergy of a system is the capability of doing work and exergy values of geothermal resources are the strongest criterion for determining the system efficiency. In this study, geothermal resources in Turkey have been classified based on specific exergy rates (SER). The computed results of exergy analysis can be used as a tool for evaluating the characteristics of resources, and the optimum application area of geothermal resources can also be defined.     

Cost analysis of energy conversion systems via a novel resource-based quantifier

The paper presents a new formalism for the costing of production chains, with special emphasis on energy conversion systems. From a mathematical point of view, this method can be described as a standard Leontiev-type input-output technique, in the formulation commonly adopted by most costing theories, including Thermoeconomics. Any complex production chain can be decomposed into modules, to each one of which mass and energy balances are applied. The resulting flow diagram is then examined from an exergetic point of view, and a cost analysis is performed. The costing paradigm is the novel feature here: rather than monetary units, a resource-based quantifier, called “extended exergy”, is employed. It is argued that both labour and financial costs can be properly linked to an equivalent resource consumption through a back-to-resource accounting procedure that expresses the total exergy consumption required to “generate” one man-hour of work or one monetary unit of currency circulation. Environmental remediation costs are similarly taken into account by computing the equivalent cumulative exergy expenditures required to achieve zero impact. It is argued, and discussed on the basis of an example of application to a cogeneration plant, that the new technique, called Extended Exergy Accounting (EEA), is a substantial improvement with respect to current engineering economic techniques, including Thermoeconomics. It is shown that EEA calculates the real, resource-based “value” of a commodity (which is not necessarily equal to its monetary cost) thus enabling Analysts and Energy Planners to perform a more complete and meaningful assessment of an Engineering Complex System. The decisive advantage of EEA consists in its being entirely and uniformly resource-based: in this respect, it owes some of its structural formalism both to the economic theory of production of commodities, which it extends by accounting for the unavoidable energy dissipation in the productive chain, and to resource-oriented economics. It must be acknowledged as well that EEA follows a path originally proposed by Szargut in his “Cumulative Exergy Consumption” method, which it extends by providing a rational and uniform treatment for all non-externalities.     

Evaluation of a chemical-looping-combustion power-generation system by graphic exergy analysis

A loop of chemical reactions is introduced to reduce the exergy loss caused by the conversion of fuel energy to thermal energy in conventional LNG powerplants. By applying this chemical loop and the graphic simulator which generates energy-utilization diagrams, a new gasturbine power-generation system called a chemical-looping-combustion system (CLCS) is composed. Exergy analysis of a model system shows an expected thermal powerplant efficiency as high as 50.2%(LHV).     

强制变相强化传热系统分析

介绍了一种强制变相强化传热系统。在恰当工况下,将泵、压缩机、膨胀装置引入传热系统,使冷热流体在换热器内强制变相,充分利用冷热流体相变潜热,达到强化传热的目的。对该系统进行了[火用]分析,并列举实例进行定性分析。     

Thermodynamic assessment of photovoltaic systems

In this paper, an attempt is made to investigate the performance characteristics of a photovoltaic (PV) and photovoltaic-thermal (PV/T) system based on energy and exergy efficiencies, respectively. The PV system converts solar energy into DC electrical energy where as, the PV/T system also utilizes the thermal energy of the solar radiation along with electrical energy generation. Exergy efficiency for PV and PV/T systems is developed that is useful in studying the PV and PV/T performance and possible improvements. Exergy analysis is applied to a PV system and its components, in order to evaluate the exergy flow, losses and various efficiencies namely energy, exergy and power conversion efficiency. Energy efficiency of the system is calculated based on the first law of thermodynamics and the exergy efficiency, which incorporates the second law of thermodynamics and solar irradiation exergy values, is also calculated and found that the latter is lower for the electricity generation using the considered PV system. The values of “fill factor” are also determined for the system and the effect of the fill factor on the efficiencies is also evaluated. The experimental data for a typical day of March (27th March 2006) for New Delhi are used for the calculation of the energy and exergy efficiencies of the PV and PV/T systems. It is found that the energy efficiency varies from a minimum of 33% to a maximum of 45% respectively, the corresponding exergy efficiency (PV/T) varies from a minimum of 11.3% to a maximum of 16% and exergy efficiency (PV) varies from a minimum of 7.8% to a maximum of 13.8%, respectively.     

太阳能吸收式空调系统集热面积的研究

分析了影响太阳能吸收式空调系统集热面积的因素;得出系统集热面积单耗的日逐时值;根据太阳能吸收式空调系统特点,提出了一种确定集热器集热面积的新方法,并以2级吸收式太阳能空调系统为例进行了详细阐述.分析结果表明,为减少集热面积,优化系统,须对太阳能空调系统增设蓄热装置.太阳能吸收式空调运行在8:00～18:00时,系统所需的最小集热面积单耗为1.085 m2/m2,其对应的蓄热器的容积单耗为0.036 3m3/m2,且随着太阳能空调运行时间的缩短,最小集热面积单耗减小,蓄热器容积单耗增加.     

Exergy analysis of lithium bromide/water absorption systems

Exergy analysis of a single-effect lithium bromide/water absorption system for cooling and heating applications is presented in this paper. Exergy loss, enthalpy, entropy, temperature, mass flow rate and heat rate in each component of the system are evaluated. From the results obtained it can be concluded that the condenser and evaporator heat loads and exergy losses are less than those of the generator and absorber. This is due to the heat of mixing in the solution, which is not present in pure fluids. Furthermore, a simulation program is written and used for the determination of the coefficient of performance (COP) and exergetic efficiency of the absorption system under different operating conditions. The results show that the cooling and heating COP of the system increase slightly when increasing the heat source temperature. However, the exergetic efficiency of the system decreases when increasing the heat source temperature for both cooling and heating applications.     

从第二定律看热电冷联供系统的能耗

试图从热力学第二定律的角度揭示热电冷联供系统的能源利用状况。首先分析了热电冷系统的Yong效率和当量制冷Yong效率，然后给出该系统的Yong流，并简要指出提高能源利用率的主要途径。     

A review on energy and exergy analysis of solar dying systems

Solar energy is a clean, abundant and freely available renewable energy sources. Energy and exergy analysis of solar thermal devices has drawn considerable interest among the researchers across the world. Solar drying is the promising option to utilize low grade energy to dry agricultural produces. Exergy analysis is a tool to access the efficient usage of solar energy. It is the property of the system, which gives the maximum power that can be distracted from the system when it is brought to a thermodynamic equilibrium state from a reference state. Using exergy analysis, based on the first and second laws of thermodynamics, it is possible to infer the true potential of different kinds of energies. In this paper, a holistic approach on energy and exergy analysis of solar dryer with case studies has been made.