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《动力工程学报》2017,(4):321-328
以某600MW超超临界燃烟煤机组为对比机组,对常规低温省煤器、低温省煤器前移和旁通烟道3种锅炉尾部烟气余热利用系统进行了热经济性与技术经济性比较.结果表明:回收锅炉排烟由122℃降温至90℃的余热,3种系统可使机组供电标准煤耗分别减小1.51g/(kW·h)、1.71g/(kW·h)和2.81g/(kW·h),需分别投资1 125万元、1 940万元和1 685万元,动态投资回收期分别为4.42a、8.66a和3.29a;低温省煤器前移对机组供电效率的提高不明显,但因应用水媒式空气预热器,受热面投资显著增大,因而技术经济性欠佳;由于节能效果显著,旁通烟道表现出最优的热经济性和技术经济性,建议对其进一步研究和推广应用. 相似文献
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青藏线太阳能热水供热系统的经济性分析 总被引:2,自引:0,他引:2
运用灰色物元法对太阳能热水供热系统与几种常规能源热水供热系统进行经济性比较 ,分别从初投资、年经营费、安全性、环境影响、技术先进性、操作管理等六个方面进行了定量对比分析。通过建立灰色物元矩阵、满足度函数、确定关联度、确定各评价指标权重等最终确定了最优方案 ,为工程方案的确定提供了理论依据 相似文献
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本文分析探讨了工业锅炉烟气可用余热量计算基准的确定问题,并建议工业锅炉末级受热面出口处的设计烟温不应高于150~160℃. 相似文献
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文中通过对京郊地区某燃气—蒸汽联合循环热电联产机组的供热系统优化设计,对余热锅炉尾气和循环水余热进行回收,用来加热热网回水,实现了低品质热量的再利用,有效地实现电厂的经济效益与节能减排. 相似文献
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在移动式余热利用实验系统基础上,对移动式余热利用系统的实际应用规模进行了成本和收益估算。通过两项经济性指标(净现值和投资回收期)进行了系统经济性的分析研究,并结合蓄热器充热时间、热源距离、余热价格等因素进行了项目的敏感性分析。结果表明,对于案例中的移动式余热利用项目,当余热成本发生变化时折现率取7%、10%、12%和15%时,对应项目在系统运行年限内的净现值大于零。根据余热成本的不同,在4种折现率情况下最长的投资回收期分别为13 a、9 a、11 a和15 a。上述经济性指标表明案例中的移动式余热利用项目从经济性上考虑是可行的。蓄热器充热时间和热源距离对项目经济性的影响程度基本相同,均大于余热价格对项目经济性的影响。该经济性研究为移动式余热利用项目的决策提供了参考依据。 相似文献
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介绍了燃气炉与太阳能联合采暖和制冷系统;阐述了太阳能采暖和制冷系统的设计方案、系统的构成、工作原理、主要的技术参数和控制方法;分析了系统的效率;提出了传统太阳能制冷系统的改造方法;给出了新型的太阳能冷一热并供系统;提出了本系统的技术特点,并指出了在使用中应注意的问题。 相似文献
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通过热力计算和技术分析,对670t/h锅炉的连扩疏水余热提出了回收利用方案,实施后安全可靠,节能效果明显,对同类电厂有推广价值。 相似文献
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H. Hüseyin
ztürk 《国际能源研究杂志》2004,28(4):341-353
In this experimental study, solar energy was stored daily using the volcanic material with the sensible heat technique. The external heat collection unit consisted of 27 m2 of south‐facing solar air collectors mounted at a 55° tilt angle. The dimensions of the packed‐bed heat storage unit were 6 × 2 × 0.6 m deep. The packed‐bed heat storage unit was built under the soil. The heat storage unit was filled with 6480 kg of volcanic material. Energy and exergy analyses were applied in order to evaluate the system efficiency. During the charging periods, the average daily rates of thermal energy and exergy stored in the heat storage unit were 1242 and 36.33 W, respectively. Since the rate of exergy depends on the temperature of the heat transfer fluid and surrounding, the rate of exergy increased as the difference between the inlet and outlet temperatures of the heat transfer fluid increased during the charging periods. It was found that the average daily net energy and exergy efficiencies in the charging periods were 39.7 and 2.03%, respectively. The average daily net energy efficiency of the heat storage system remained nearly constant during the charging periods. The maximum energy and exergy efficiencies of the heat storage system were 52.9 and 4.9%, respectively. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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Studies of the DLR Mediterranean – Concentrated Solar Project indicate Iran can be a part of the Mediterranean renewable power generation chain in 2050 to provide the electrical power demand of Europe. However, Iran as a developing country and due to its large area has some limitations on the number of synoptic stations. Hence, the aim of this study is to determine the theoretical solar irradiation potential in Iran by using an Niroo Research Institute irradiation model based on the geographical and meteorological data. Monthly, seasonal, and annual values of irradiation on the ground surface, and extracted solar energy from different tracking systems, are estimated across the country. A typical photovoltaic system, parabolic trough, and dish concentrator are considered and extracted solar energy of them is illustrated on the map. Results of this study make clear that the presented solar atlas can provide appropriate tools for primary study of solar energy potential and extracted energy in Iran. 相似文献
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从能量梯级利用的角度出发,提出了一种新型太阳能冷热联供复合系统。该复合系统可根据太阳辐射强度在不同的季节分别用作单一的太阳能热水器、热泵热水器或太阳能吸附式冷热联供复合系统。建立了相应的数学模型,计算了该系统在不同季节各种典型工况下的性能指标。计算结果表明,该系统不仅可实现冷热联供的双重功能,而且具有较大的节能潜力。 相似文献