350MW火电机组给水泵不同驱动方式的能量价值分析研究

基于能量价值分析计算方法,阐述了给水泵两种不同驱动方式下输出净功率、供电煤耗率、综合煤耗率的3种计算方法,并根据华能东方电厂350 MW机组在日常调峰范围内不同运行方式下的参数,应用3种方法进行了定量分析计算,得出对于调峰负荷在50％ ～ 100％情况下的350MW新建火电机组,采用汽动给水泵方式具有更好的经济效益,给同类型机组给水泵驱动方式的选取提供了借鉴依据.     

基于能量价值分析的给水泵驱动方式的技术经济论证

通过对发电厂各种能量的价值分析,提出了“能量价值分析”原理,按此原理推导出了“综合成本煤耗率”的计算公式,此方法克服了传统热力学分析方法的局限性,把热力学和经济学有机地结合在一起,成为在市场经济条件下发电厂技术经济分析的科学方法,找到了市场经济条件下发电厂降低成本的有效途径和节能分析准则,并成功地应用于给水泵驱动方式的技术经济论证。     

小型汽轮机拖动热电厂给水泵的节能分析及应用

本文分析了不论是在抽凝机组和背压机组并存状态下供汽，还是在全背压机组状态下供汽，把热电厂的部分设备看成一个组合单元，对其能量的利用进行分析和比较，从而阐明利用小型汽轮机拖动给水泵工作与除氧器设备组合使用，都要比电动给水泵或变频电动给水泵工作节能、经济；由其在抽凝机组不可停发的前提下，利用小型汽轮机拖动给水泵工作与除氧器设备组合使用，更能把抽凝机组浪费的能量利用起来。再通过具体应用地举例，使人们能够深刻的体会到，怎样才能做到更节约、更经济、更合理的利用能源。     

660MW机组100%容量汽动给水泵项目的技术经济性分析

为了考查安徽某电厂新建2×660 MW工程中100%容量汽动给水泵项目的技术经济性,拟定了3种典型的给水泵方案,然后通过投资回收期法,推荐采用100%容量给水泵,配国产小汽轮机与进口芯,同时配独立凝汽器方案。     

给水泵汽轮机效率计算方法的分析

采用热力学方法对给水泵进行分析。根据能量守恒原理,通过给水泵与小汽轮机轴之间的联系,进行倒推,算出给水泵汽轮机的效率。     

锅炉给水泵及其驱动装置的选型和配置

分析了大型火力电厂影响锅炉给水泵及其驱动装置的选型和配置的因素，用“年费用最小“法对２００，３００，６００ＭＷ机组给水泵的合理配置方案进行了论证。     

55MW机组电动给水泵节能改造

文中以55 MW机组配套的电动给水泵为对象,对其运行状况及运行参数进行了统计和分析,并针对其运行中存在的问题提出了采用节能技术改造的措施,同时对电动给水泵改造后的运行经济性进行了分析。从改造结果看,采用节能技术对给水泵实施改造对降低机组煤耗,提高机组效率,延长机组寿命都具有重要意义。     

600MW等级直接空冷机组的电动给水泵配置分析

给水泵是发电厂重要辅机之一,对电厂安全、稳定和经济运行起着非常重要的作用。文中分析了空冷机组的设计运行条件,推荐600MW等级直接空冷机组主给水泵组采用3×35%最大给水容量电动调速给水泵组。     

给水泵汽轮机建模和仿真分析

介绍了给水泵汽轮机的运行工作原理,分析了给水泵汽轮机的工作特点,建立了给水泵汽轮机的数学模型,并建立了给水泵汽轮机调节回路模型和仿真模型,分析给水泵汽轮机在转速给定发生阶跃扰动时的稳定性能.     

热动力泵替代电动泵的应用分析

通过对红豆集团无锡南国企业有限公司的热动力泵替代电动泵的应用项目的研究,从该项目的应用效果、适用性等方面分析其推广价值.一台汽动给水泵替代3台132 kW电动给水泵,而3台电动给水泵年耗电量268万kWh,折标准煤1083 t标煤;在给水量没有变化的工况下,一台汽动给水泵年耗用蒸汽热17424 MkJ,折标准煤723t标煤.能耗下降33.24%.     

A marginal measure of energy efficiency: The shadow value

Economists are well aware of the importance of marginal versus average measures of energy efficiency. Yet in the energy literature, there is no consensus on the appropriate method for defining and measuring energy efficiency. This paper sets out the shadow value of energy as a proper and meaningful marginal energy efficiency index. A restricted profit function is used to model the shadow value. We explore four scenarios to characterize and evaluate the shadow value of energy; a within country comparison of different production processes with different energy requirements, a comparison of different countries with different resource endowment, a government policy to impose a tax to alter the shadow value to address environmental issues and a within country comparison of externalities arising from two sources of energy. A comparative static analysis is carried out to sign the functional arguments defined for the shadow value.     

The impact of the life cycle analysis methodology on whether biodiesel produced from residues can meet the EU sustainability criteria for biofuel facilities constructed after 2017

This paper considers biodiesel production from residues; tallow and used cooking oil (UCO). The tallow system is more complex involving two processes. The first process is rendering in which tallow (animal fat) and Meat and Bone Meal (MBM) are produced from the slaughter of cattle. MBM is assumed as a thermal energy source for cement manufacture and thus is not used for biodiesel production. The second process is biodiesel production from tallow. Three methodologies are employed to examine sustainability of the biodiesel. The no allocation approach assigns all the parasitic demands to the tallow; thus all energies required to make both MBM and tallow are associated with the tallow biodiesel. The resulting energy balance is negative. The substitution approach allocates the energy in MBM (used to produce cement) to tallow biodiesel. This results in the net energy being greater than the gross energy. The allocation by energy content method divides the parasitic demands of the rendering process between tallow and MBM by energy content. The parasitic demands of the biodiesel process are divided by energy content of the biodiesel, glycerol and K-fertiliser. For tallow biodiesel this yielded a net energy value of 38.6% of gross energy. The same method generated a net energy value of 67% for UCO biodiesel. More importantly the recommended method (allocation by energy content) generated a value of 54% greenhouse gas (GHG) emission savings for tallow and a value of 69% for UCO. Plants commencing after 2017, need to have a 60% GHG emission savings, to be considered sustainable. Thus a facility treating both feedstocks would need to treat a maximum of 60% tallow to be considered sustainable after 2017.     

互补集合经验模式分解与奇异值能量谱在风电齿轮故障识别中的应用

针对风电机组齿轮系统故障模式的有效识别问题,提出一种互补集合经验模式分解(CEEMD)与奇异值能量谱相结合的故障识别方法。利用CEEMD将齿轮非平稳信号分解为有限个平稳的本征模态函数,并将其组成初始特征向量矩阵,对矩阵进行奇异值分解并求出风电齿轮不同工况下的奇异值能量谱分布,以奇异值能量谱为元素构造特征向量,通过计算不同工况振动信号的灰色关联度来判断齿轮的故障类型。实例表明,该方法能有效应用于风电机组齿轮系统的故障诊断。     

链式能量系统热经济孤立化的新方法与证明

基于热经济孤立化的思想,提出了链式能量系统热经济孤立化优化的新方法,并证明了该方法的收敛性。对一非线性链式能量系统,验证了该方法的有效性,从而使热经济孤立化在链式系统的设计与运行优化决策上具有实用性,为热经济孤立化在热能动力工程系统和其它系统的应用奠定了基础。     

不同能源统计加总方法的比较

能源统计对能源管理及能源发展规划和战略具有重要意义.能源加总是能源统计中的基本问题之一.我国能源加总方法以热当量法为基础,然而该方法仅考虑了不同能源‘量’的属性而忽略了其‘质’的属性,因此加总结果不能正确反映出不同能源的真实价值.为把影响能源价值的主要因素包含在能源加总中,本文对现有文献中提及的四种方法进行了对比分析,...     

The value of energy carriers

The value of energy carriers can be described thermodynamically by the amount of heat (enthalpy method) or work (exergy or availability method) that can be obtained from the carriers. Prices for energy carriers are used in economics to express their values. The prices for energy carriers are often related to their enthalpies when other properties and conditions are equivalent. However, it has been suggested that the exergy of the energy carriers is the proper quantity to establish their values, i.e. prices should be based on these exergies.In this paper, the structure of the energy demand is included in the analysis of the value concepts. The aggregated energy demands of the industries in The Netherlands and West Germany (F.R.G.) are used as examples. Optimization of the total system is the proper way to establish the performance of energy carriers. In this optimization, several assumptions must be made about availability and applicability of technical options, such as heat cascading, cogeneration and heat pumps. The structure of the demand influences the importance of energy carriers and thus their value in a given system. Neither the enthalpy nor the exergy of the energy carriers is an adequate base for price setting.     

Evaluating and ranking energy performance of office buildings using Grey relational analysis

Traditional methods of evaluating energy performance of building tend to focus on comparing the observed energy consumption with the average value of energy consumption by regression method or theoretical value calculated by simulation analysis. For evaluating and ranking the energy performance of buildings, this paper proposed a perspective of multiple objective outputs to evaluate the energy performance of buildings and then use a multiple attribute decision-making approach, Grey relational analysis (GRA), to rank the evaluated buildings. The energy performance of 47 office buildings in Taiwan were evaluated and ranked to serve as a case study to illustrate the procedure and effectiveness of the proposed approach.     

细木工板生产能耗指标的确定及计算与测试方法

文中介绍生产的状况及合理确定细木工板生产综合能耗指标的重要性,详细阐述细木工板生产能耗的计算方法和修正系数.对加强细木工板企业能源管理、提高企业的能源利用效率以及减少能源的浪费等都具有一定的参考价值.     

预制舱式磷酸铁锂电池储能电站能耗计算研究

  目的  基于站内能量损耗来源和设备属性详细分类,提出了预制舱式磷酸铁锂电池储能电站能耗计算方法。  方法  从储能电站的角度论述了预制舱式磷酸铁锂电池储能电站能耗计算中需考虑的主要因素,进而将储能电站的能耗分为2个部分,即储能系统自身的损耗和辅助设备运行的损耗,并分别给出了每部分能耗的计算方法及效率值的选取方法。  结果  通过实际算例,分析了配置规模为2 MW/2 MWh的储能电池预制舱在典型运行方式下的全天运行能耗,并与现场试验结果进行了对比,从储能电池产热和空调传导热能的角度分析了现场试验结果和理论分析的差别,对储能电站的能耗统计提出了建议。  结论  研究提出的能耗计算方法较全面地论述了影响预制舱式磷酸铁锂电池储能电站能耗指标的主要因素,依据设备属性详细分类给出了主要设备的能耗计算方法,具有较好的工程参考价值。     

Evaluation of new and renewable energy technologies in Korea using real options

For several years recently, the price of oil has fluctuated due to the weak US dollar and financial risks. In particular, the WTI crude oil price reached $147 per barrel in July of 2008, which is the highest price thus far. An awareness of an impending crisis and concern over climate change are driving an increase in R&D for alternative energy sources instead of fossil‐based energy. However, the researches based on traditional method show negative options about the economic value of new and renewable energy. This paper evaluates the value of new and renewable energy through a real option method which considers the uncertainty associated with fossil energy and the uncertainty of the success of R&D. The evaluating model assumes that the fossil energy price follows a geometric mean reverting process and that the probability of success with R&D on renewal forms of energy follows a binomial probability model. The model considers four options: the option to continue R&D, the option to delay R&D, the option to deploy R&D, and the option to abandon R&D. Finally, the value of Korean R&D on renewal forms of energy is analyzed by the model. Copyright © 2012 John Wiley & Sons, Ltd.