共查询到20条相似文献,搜索用时 171 毫秒
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赵山渡水库漂浮物一直影响电站的安全运行,甚至危及温州地区工农业生产及城市生活用水亟待解决.根据赵山渡水库漂浮物的组成成分、运动规律及特点,提出了综合治理水库漂浮物的措施. 相似文献
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对循环流化床上部稀相区气固混合物横掠圆管的对流换热研究,多数是针对鼓泡床的研究,而对循环流化床上部稀相区的对流换热研究目前还很少。本文对稀相含尘气流横向冲刷圆管的对流换热进行了研究,并在理论分析的基础上,在热态循环流化床实验台的上部稀相区进行了实验。采用平均粒径分别为137μm,146μm和326μm的石英砂为床料。实验结果表明,稀相含尘气流与纯空气横掠圆管时的对流换热系数之比hd/hg主要受稀相含尘气流密度和颗粒粒径的影响,通过理论分析和实验数据的拟合,得到稀相含尘气流横掠圆管的准则方程。研究基于热态实验,结果更接近于实际工况,可为循环流化床的设计提供理论依据。 相似文献
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介绍了一种新型笼屉式相变蓄热水箱,通过实验测试对比分析相变蓄热水箱与普通蓄热水箱对太阳能组合系统的太阳能保证率及系统能效比的影响。实验表明:同等水箱容积,使用相变蓄热水箱时太阳能集热系统的小时集热量为普通蓄热水箱的3.7倍,相变蓄热水箱有利于提高太阳能保证率及系统能效比。在太阳能辐照强度相似的情况下,相变蓄热水箱会使太阳能保证率平均提高72%,使系统能效比平均提高26%。同时相变蓄热水箱可减少夜间水箱上部的热损失,使水箱上部水温降减少50%。 相似文献
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当今世界各国正积极开发新能源以实现碳中和的目标,氢能是新能源中备受关注的一种能源形式。氢安全是氢能利用领域中被重点关注的问题之一,但氢气的燃烧和爆炸研究实验具有一定危险性。与实验相比,计算仿真是一种低成本且更安全的方法。针对10%氢气浓度的氢气-空气混合气体在密闭空间的燃爆现象,进行了4个工况的实验,并依托FLACS程序开展计算仿真,将实验结果与仿真结果进行对比分析。结果显示,FLACS计算压强的平均误差为15.3%,温度的平均误差为10.4%。FLACS压强峰值的高估比例为1.073,温度峰值高估比例则为1.272。误差的部分原因是FLACS无法模拟部分实验现象,例如部分火焰熄灭,导致仿真峰值数据高于实验数据。仿真结果中,压强和温度数据相比于实验数据有提早上升的趋势,这与许多文献的结论一致。该现象发生的原因在于FLACS模拟中燃烧是点火零时刻发生,而实验中燃烧在燃料被实际点燃时发生,该时刻与点火器启动时刻有短暂时间间隔。对比层流火焰燃烧速度,FLACS仿真的误差为13%。对比温度场发展趋势图,仿真与实验结果都显示火焰往罐体上部传播速度最快,在实验中火焰前锋停止于罐体两侧而仿真结果的火焰前锋则停止于罐体上部。 相似文献
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灯泡贯流式水轮机效率问题 总被引:2,自引:0,他引:2
灯泡贯流式机组具有适用水头低、机组过流量大、效率高等特点,已广泛应用于开发低水头水力资源.针对灯泡贯流式机组运行过程中受水质、水中漂浮物、导叶与轮叶协联和气蚀、尾水位变化等影响使机组发电效率变化较大,提出了密切关注机组运行工况、优化调度以提高机组效率. 相似文献
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超临界直流锅炉在顶部密封大罩内各个穿墙管,在直流炉停炉冷却时表现最为突出的是:一是炉膛上部垂直管水冷壁与炉膛外部垂直管水冷壁;二是炉膛上部屏过、高过与它们上部穿墙管;三是上部穿墙管与各个联箱处收缩撕开对此将其加装通风口及轴流风机设计成为能够具有降温、监视炉膛外穿墙管收缩以及大罩内受限空间工作进行通风功能的顶部密封大罩。 相似文献
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大峡水电站技术供水系统技术改造 总被引:1,自引:0,他引:1
王学忠 《电网与水力发电进展》2010,26(6):81-84
大峡水电站受洮河和湟水河支流影响,汛期来水含沙量大,且夹带大量杂物、杂草。经过近10a的运行,原技术供水系统已不能满足机组高效运行,通过改造安装闭式循环冷却水系统对原有的供水设备进行全面改造,成功地解决了泥沙、漂浮物、结垢等长期困扰电站供水系统运行的问题。对技术改造从方案论证、设备选型、施工安装、调试运行等方面进行了分析总结。 相似文献
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In this work, an attempt is made to produce potable water from industrial effluents. An ordinary basin type solar still integrated with fins at the basin plate is used for experimentation. Since industrial effluent is used as feed, before this still, an effluent settling tank is provided to get clarified effluent. This effluent settling tank is fabricated with three chambers, consists of pebble, coal and sand for settling the impurities and removing the bacteria in the effluents. Sponges, pebbles, black rubber and sand are used in the fin type single basin solar still for enhancing the yield. Results show that the productivity increases considerably due to this modification. A theoretical analysis is also carried out which, closely converges with experimental results. The economic analysis proved that the approximate payback period of such kinds of still is 1 year. 相似文献
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汽轮机润滑油系统的清洁度,直接影响到机组的安全运行。介绍了2011年沙洲电厂排查1号主机润滑油系统中5~15μm颗粒数超标的分析思路及消缺经验。润滑油中5~15μm颗粒数超标的主要原因是主油箱人孔门密封不好,周围空气中污染物侵入油箱造成颗粒数超标,经过严密封堵人孔门后油中5~15μm颗粒数指标已经合格。在经过调研比对后,参照目前国内大部分同类电厂主油箱负压维持在-0.3~-1.5kPa的技术规范,利用排油烟风机出口碟阀进行节流,将1号机主油箱负压由-4.1kPa逐渐调至-1.0kPa左右,机组运行至今安全、可靠,证实了该运行方案可行。 相似文献
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S. Wei S. Zhe L. Yang W. Peidi Y. Xi 《Numerical Heat Transfer, Part A: Applications》2013,63(12):1345-1355
ABSTRACTAs per the way of heat transfer and its main characteristics for oil tank, the theoretical model of steam coil heating in large oil storage tanks was established. The Visual Basic language was applied for calculating the temperature field of crude oil in the heating process by the trial method procedure, and the variation law of temperature field and the energy effective utilization rate of oil tank could be obtained. Results show that the temperature of crude oil and the energy effective utilization rate became higher with the increase of the ambient temperature, steam pressure, and the reduction of storage liquid level. The temperature of crude oil near the steam coil became higher with the increase of steam pressure. The oil temperature at the tank outlet presented periodic change, which was affected simultaneously by the steam pressure and the ambient temperature. 相似文献
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为了满足大容量油箱的变压器使用要求,在对传统油箱的结构及其散热原理进行分析的基础上,提出采用A型波纹片波翅方案的油箱,从而改变了散热方式,形成了一个湍流的油流循环,提高了散热效果。使用该新型波纹片的实验结果表明:油箱的散热得到了明显提高,完全符合国家标准,具有效率高,成本低等特点。 相似文献
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储罐内壁铁锈在低温有水的条件下与储罐中的硫化氢气体反应生成硫铁化物.硫铁化物的氧化放热是引起含硫油品储罐着火的主要原因.采用X-射线衍射仪鉴定铁锈成份,对铁锈主要成分室温下进行硫化及硫化产物的氧化实验,绘制硫化及硫化产物氧化反应温度-时间曲线,并鉴定分析硫化产物及硫化产物的氧化产物,研究对含硫储罐自燃的作用.结果表明,铁锈主要成分为Fe2O3和Fe3O4,室温硫化产物均为FeS,但FeS形状与其来源有关.形状、致密性不同,致使氧化自燃性不同.Fe2O3硫化产物比Fe3O4硫化产物的氧化自燃性高,对引发储罐自燃的危险性大. 相似文献
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《International Journal of Hydrogen Energy》2022,47(18):10308-10314
Considerable swelling stress associated with hydrogen absorption process caused by metal hydride expansion is extensively observed in a metal hydride tank which is usually designed for hydrogen storage application. Such swelling stress being applied to tank wall may cause potential safety issue such as tank failure. In the present investigation, silicone oil is selected as an additive incorporating into MlNi4.5Cr0.45Mn0.05 alloy in an attempt to alleviate the swelling stress. The results obtained by a self-built direct swelling stress testing apparatus show that the addition of silicone oil can significantly reduce alloy particle swelling stress. The addition of 3 wt% silicone oil is appropriate to acquire efficient swelling stress alleviation. During cycling the maximum swelling stress increases with charging pressure. The formation of silicone oil thin film on the surface of alloy particles, acting as a “cushion” among alloy particles, would reduce particle agglomeration and enhance particle movement during hydrogen absorption and desorption cycling. This is the reason for the observed swelling stress alleviation by silicone oil. 相似文献
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《Applied Thermal Engineering》2003,23(4):409-416
This paper describes a waste heat recovery apparatus that utilizes the truck exhaust gas to heat the bitumen used in road maintenance by means of heat transfer oil as working fluid when en route to road maintenance destination. This apparatus is composed of an oil heater, bitumen tank, oil circulation system and some auxiliary instruments. By measuring temperatures and flow rate of exhaust gas, it is concluded from the calculation and analysis that this waste heat recovery apparatus is feasible and can save much conventional energy and decrease environmental pollution. 相似文献