共查询到18条相似文献,搜索用时 296 毫秒
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本文对太阳能槽式热发电系统中蓄热系统油盐换热器的设计从理论设计和工艺制造进行了相关说明,从油盐换热器的介质的特殊性、换热工质温度差的特殊性、工作过程的特殊性作了解释。 相似文献
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<正>从中国科学院电工研究所获悉,我国首个利用太阳能产生的蒸汽来驱动汽轮发电的发电机日前正式运行。这是我国太阳能热发电领域的重大自主创新成果,标志着我国掌握了太阳能热发电技术。该项目是"863"计划重点项目,由中国科学院电工研究所—皇明太阳能集团联合实验室承担。自2007年1月实施以来,开展了太阳能热发电系统集成技术、全厂控制技术、高精度低成本定日镜技术、高可靠性吸热—传热—蓄热技 相似文献
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为提高太阳能制冷系统的性能参数,建立了集热蓄热一体化集热器模型,以进行应用计算。基于TRNSYS与MATLAB软件联合模拟运行的无辅助热源的太阳能吸收式制冷系统,分别对采用传统集热器的系统和采用改进后的相变蓄热集热器的系统的各部分参数的变化进行分析,对集热器的效率、系统制冷量和性能系数进行了对比。模拟结果表明,在太阳能吸收式制冷系统中,采用改进后的相变蓄热集热器,与传统的集热器相比,其集热效率提高约7.62%,系统制冷量增加约9.99%,系统的COP增加约23.60%。本模型能较好地应用于太阳能吸收式制冷系统的模拟。 相似文献
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通过一种蓄热技术使发酵过程中的余热得到了很好地利用。经过实际检测,一台100m3发酵罐,实消降温时产生了高温冷却水,通过相变蓄热将高温冷却水中的热量予以储存,存储热量可达117×105 kJ。 相似文献
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《化工管理》2019,(31)
电热储存系统(ETES)是一种高性能储热系统,其克服了二次能源在供应和需求之间时间性、局部性的差异,是当前提高能源利用率和保护环境的重要手段。其中,寻找性能优异的蓄热材料是电热储存系统投入工业实际运用的关键。文章采用熔融浸渗法,以高孔隙率、低成本、耐高温的SiC-Si3N4多孔陶瓷材料为基体,以NaCl为熔体,成功制备了SiC-Si3N4/NaCl新型多孔基复合相变储热材料。实验表明该新型多孔基复合相变储热材料的浸渗率在70%以上,具有高硬度,高温液态熔盐在毛细力和基体复杂微孔网络结构下,不会发生泄露。新型材料具备工业推广的实际价值,能够运用于电热储存系统,有效解决工业余热和废热、环境污染、节能减排、弃风消纳等实际难题。 相似文献
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为了提升空气源热泵低温环境中的热效率,解决热泵冬季易结霜、故障率高等问题,提出一种利用相变蓄能装置将空气源热泵和水源热泵组合的蓄联热泵技术。以河北保定高速某服务区蓄联热泵的改造工程为例,设计了蓄联热泵系统改造方案,并将蓄联热泵联合供暖系统的实际运行数据与位于同一地区、相似建筑中使用单一热源供暖的空气源热泵系统运行数据进行对比,考察供水温度、室内温度、单位供暖面积的耗电量和COP值等因素的变化情况。研究结果表明,在相同室外气温、相同单位面积供暖热负荷的条件下,蓄联热泵供暖效果更稳定,室内温度更高,蓄联热泵每平方米耗能相比空气源热泵低15.5%,综合COP提高了20.68%,静态投资回收期为11.89年。蓄联热泵清洁供暖技术具有一定的可靠性和经济性,适用于低温持续时间较长的偏远山区等寒冷地区,研究结果对蓄联热泵的推广具有重要的借鉴意义与应用价值。 相似文献
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日本的火力发电机组能源利用效率高,常规的燃煤发电的热效率达到了43%以上,燃气机组由于采用了联合循环系统,其热效率水平更高,达到了53%以上。其综合的热效率较我国的火力发电的热效率高很多,这与发电机组的设计制造水平有关,也与机组的运行工况有关。从日本的一次能源供给情况、发电用能源的结构状况、各种类型发电机组的负荷情况等分析其热效率高的原因,并对我国的电源结构及各种类型发电机组的负荷情况进行分析,提出应适当调整我国的电源结构、提高能源利用效率的相关建议。 相似文献
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The distributed generation as well as the combined production of electrical energy and heat for domestic use in order to increase the energy efficiency becomes more important and both technically and financially feasible. However, feasibility and efficiency can be significantly increased by decoupling the production of heat or power or the referring demand in order to operate the production units in the most efficient way. Thermal storage systems connected to combined heat and power units offer the opportunity of such a decoupling of production and demand for heat in domestic or industrial use. In this article, based on an analysis of different thermal storage technologies, a model is introduced for optimal operation of thermal storage connected to combined heat and power units in terms of the generation costs or contribution margin as extension of an energy generation planning and trading optimization method. Moreover, the application, coordinated operation and participation in spot markets of such plant-storage-combinations are evaluated. 相似文献
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为了探讨冷库蒸发器积霜对冷库热工状况的影响,为冷库及时化霜和无霜运行提供科学依据,试验选用10t3HP的双温双控冷库为研究对象,动态监测了蒸发器积霜前和积霜后两段时间内库温、霜温、蒸发器进风口与出风口温差、冷库耗电量,绘制了蒸发器外表面的三维温度场。试验结果表明:蒸发器积霜前,库温周期变化较为稳定;积霜后,冷库运行周期由3个阶段变为风机运行和制冷2个阶段且库温最低温度逐渐升高,达不到设定下限,周期变化幅度减小,用时缩短。积霜后的霜温周期最低值达到霜温设定下限,冷库不能在正常设定的范围内运行,蒸发器的制冷效率明显下降。蒸发器积霜使进风口与出风口温差减小;冷库运行12h的耗电量增加147.06%。积霜后蒸发器外表面三维温度场显著不同,各点温度都有所下降,偏离设计的最低温度。试验表明,冷库运行过程中不积霜运行是冷库节能安全运行的重要因素。 相似文献
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A change in the normal routine at a factory, which produced a cellulose-based product, necessitated taking the individual blocks of material from a hot curing process (ca. 200°C) and packing them before they had cooled to an appreciable extent. Spontaneous ignition took place in the packaged material some hours later. Considerable damage to buildings and other losses were incurred. The ambient temperature within the store was not sufficiently high to cause thermal ignition. The problem proved to be a special but not necessarily unusual case in which the onset of ignition was governed by the initial temperature of assembly of the packaged material. These circumstances have been recognized in the fibreboard manufacturing industry for example, such that US legislation requires the cooling of newly manufactured boards below a specified temperature before stacking takes place [1]. We discuss the theoretical background to this type of problem, based on an adaptation of thermal ignition theory with conductive heat transport (Frank-Kamenetskii conditions). We obtained the appropriate kinetic and thermochemical parameters for exothermic reaction in a cellulosic material in order to apply the theory. We were then able to calculate a maximum packing temperature to expedite safe but efficient storage or transport. The numerical calculations to solve the spatial and time dependent energy conservation equations by use of the finite difference method required a three dimensional grid, set up as 203 mesh points, equivalent to cube-shaped, packaged material in the practical application. Most of the calculations were performed on a personal computer. 相似文献