共查询到20条相似文献,搜索用时 62 毫秒
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目前在不同献中对空气预热处理器漏风系统,漏风率的计算公式及两相互关系上有着不同的规定或论述,造成实际使用中混乱或不便,本通过比较,论证和分析,对这些问题进行了讨论和澄清。 相似文献
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为了提高锅炉热效率.在锅炉尾部一般布置有省煤器和空气预热器。这些尾部受热面由于结构上的原因,在锅炉实际运行中,造成严重堵灰.这在一定程度上制约了锅炉热效率的进一步提高。在锅炉运行同期的后期,甚至严重影响锅炉的经济运行。下面通过本厂1台SHL20-2.45—A型锅炉管式空气预热器的改造,谈谈空气预热器对锅炉经济运行的影响。1.原有空气预热器存在的缺点锅炉制造厂家原配置的管式空气预热器.管径为40×1.5,管长为2876mm,共1024根,横向;和距80mm。纵向间距45mm.烟气流通面积1.1m2,空气受热面积34.5m2,烟气设计流速1… 相似文献
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1前言某发酵食品厂的两台SZW4-13型往复锅炉和一台SZW10-13型锅炉,主要担负为该厂发酵生产提供蒸汽。但运行情况一直不佳,运行效率低下(小于60%),锅炉蒸发量不足(仅为额定蒸发量的50%~60%),成为制约该厂生产能力和影响经济效益的主要因... 相似文献
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通过对回转式空气预热器漏风率的分析,说明了漏风控制系统在降低漏风方面所起到的作用,及由此对电厂经济运行所带来的益处。 相似文献
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对安徽淮南平圩发电有限责任公司600MW机组#2锅炉2台空气预热器进行技术优化及改造,降低漏风率及风机电流,提高空预器运行的经济性. 相似文献
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本文主要介绍了锅炉尾部烟道区空预器漏风率与时间关系的数学表达式,直观反映了空预器漏风率随时间增长的变化规律。阐述了漏风对机组热经济性的影响;概述了空预器设备损坏的主要原因;提供了数学模型的适用范围和使用方法;并附有应用的实例。本文对有管式空预器的大、中型容量的锅炉,有一定的实用意义,对其它小型锅炉空预器的漏风率也可参照估算。 相似文献
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为了研究空气预热器漏风对机组性能的影响,以某330 MW循环流化床锅炉机组空气预热器为研究对象,建立了计算其漏风率对排烟温度、热风温度及风机电耗影响的热力学模型并进行了性能计算,结果发现,空气预热器漏风率对锅炉效率及风机电耗均影响较大,尤其是漏风点在空气预热器的热风出口处,在该处当漏风率为20%时对锅炉效率影响可以接近0.6%,同时增加风机电耗超过730 kW。除对机组经济性影响较大之外,空气预热器漏风还会对机组的可靠性产生较大影响,比如管式空气预热器会降低机组的出力,造成机组非计划降低出力事件;对于回转式空气预热器,可能还会造成机组非计划停运事件。为了更好的监控空气预热器漏风,还提出了一种监测空气预热器漏风率的方法,即通过监测相同工况下不同时间段空气预热器出口热风与进口冷风流量之间的差异来判断空气预热器漏风的严重程度,为合理安排空气预热器的检修周期提供了很好的参考依据。 相似文献
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北方地区建筑渗风能耗与传热能耗的比例分析 总被引:2,自引:0,他引:2
高层建筑渗风能耗已成为暖通专业中不容忽视的问题,本文不北方地区高层住宅建筑的渗风能耗以算例的形式进行了具体的量化分析,提出了减少渗风能耗的几种方法。 相似文献
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Sivarathinamoorthy Haldorai Sureshkannan Gurusamy Maruthaiyan Pradhapraj 《国际能源研究杂志》2019,43(12):6061-6077
The drying needs of agricultural, industrial process heat requirements and for space heating, solar energy is one of the prime sources which is renewable and pollution free. As the solar energy is inconsistent and nature dependent, more often there is a mismatch between the solar thermal energy availability and requirement. This drawback could be addressed to an extent with the help of thermal energy storage systems combined with solar air heaters. This review article focuses on solar air heaters with integrated and separate thermal energy storage systems as well as greenhouses with thermal storage units. A comprehensive study was carried out in solar thermal storage units consisting of sensible heat storage materials and latent heat storage materials. As the phase change heat storage materials offer many advantages over the sensible heat storage materials, the researchers are more interested in this system. The charging and discharging characteristics of thermal storage materials with various operational parameters have been reported. All the possible solar air heater applications with storage units have also been discussed. 相似文献
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In order to produce process heat for drying of agricultural, textile, marine products, heating of buildings and re-generating dehumidify agent, solar energy is one of the promising heat sources for meeting energy demand without putting adverse impact of environment. Hence it plays a key role for sustainable development. Solar energy is intermittent in nature and time dependent energy source. Owing to this nature, PCMs based thermal energy storage system can achieve the more popularity for solar energy based heating systems. The recent researches focused on the phase change materials (PCMs), as latent heat storage is more efficient than sensible heat storage. In this paper an attempt has been made to present holistic view of available solar air heater for different applications and their performance. 相似文献
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In the design of solar air heaters (SAHs), channel depth is a principal variable to be fixed. In this paper, the effect of the channel depth on the energy gain of type I and type III SAHs has been investigated by computational fluid dynamics (CFD) simulations. Laminar model and k–ω turbulence model of Wilcox are used for the prediction of flow and temperature field in SAHs. Our study shows that the heat transfer corresponding to the temperature distribution across the channel in SAH varies greatly with the change of channel depth. Based on the first and second laws of thermodynamics, the optimal channel depths for type I and type III SAHs with black-painted absorber are suggested as 10 mm. It is found that with selective coating, the absorber plate should be further from the cover glazing in order to prevent excessive convective heat loss, the distance is better of no less than 20 mm. In type III SAH, air flows in two channels above and below the absorber plate, the depth ratio of up channel to down channel should be no less than 1. 相似文献
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在自行搭建的双蓄能实验平台上进行了制冷兼蓄热实验研究,对比了制冷兼蓄热模式和一般制冷模式,探讨了不同冷冻水流量和不同风机盘管风量对机组性能的影响.实验结果表明:蓄热对机组制冷端的影响很小,但是由于回收了大量的冷凝热,使得机组的综合能效比得到大幅提高,因此蓄热对空调节能具有较大作用.此外,在制冷兼蓄热模式下,冷冻水流量或风机盘管风量越大,机组的综合能效比越大,当风量为1033 m3/h,冷冻水流量为972 L/h时,机组综合能效比高达7.06. 相似文献
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分析讨论了冬季工况室内设计参数与夏季不同时,二次回风系统绝热加湿后的机器露点对空调系统设计与运行能耗的影响以及宜采取的节能措施。 相似文献