共查询到18条相似文献,搜索用时 171 毫秒
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感应加热的发展可从设备方面和应用方面来看。本文主讲省能的理论和横切磁通加热法。一般的感应加热法是利用较高的频率,在被加热物表皮层中感生电流去加热的,可称为表面加热法。横切磁通加热(Transverse fltx heating简称TVF),是把感应器产生的磁通横切 相似文献
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闭式地表水源热泵在冬季极端运行工况下,地表水换热器的进水温度会下降,可能导致管道冻结.对可采用的两个解决方案电辅助加热法和添加乙二醇防冻剂法进行了分析,结合实例对两套方案的经济性和环保性进行了比较,论证了采用电辅助加热法的合理性. 相似文献
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<正> 我国开采的原油多为含蜡原油,其含蜡量为5%~35%。这类原油的特点是凝固点高,粘度大、低温流动性差,管道常温输送困难。通常,我国均采用传统的逐站加热法输送。加热法输送,虽然可行,但这种输送方法能耗较高,每年我国仅用于加热输送而烧掉的原油就 相似文献
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本文分析了目前纺织行业普遍采用的防天窗结露的措施——天窗排管加热法,认为这一传统作法耗能大、效果差,不应继续提倡,并建议采取其它措施防止结露。 相似文献
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<正> 管道工频集肤效应加热法,是六十年代出现的一种金属管道加热法,是大型石油化工等企业热输管道加热保温的新技术、新工艺,国外简称为SECT法,(注:SECT为集肤效应加热的英文缩写)。这方面我国1979年开始试验研究,1985年辽河油田在总长18km、管径108mm的21条高凝油(凝固点高达64℃的一种原油)集输管道上采用了这项加热新技术,在253K的低温环境中保证正常输油,获得成功,并取得显著经济效益,1987年通过了局级技术鉴定。 相似文献
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INTanDUCTIONTheffoalstagesoflargesteamturbineinthefossiLfiredpowerplatandallstagesofturbineinnuclearpowerplatoper8teinthewetsteamregion.Becausethepressureandtemperatureofthesteamarenotin-dependeatinttheregion,inordertodeterminethewetsteamstateanotherparametermustbefound.Then,itisveryimp0rtatt0findasimpledirectmethodformeasuringthewetnessinsteamturbine.Thewetnessmeasuremelltwouldhelpthe0peratortogetthedetailknowledgeoftheradia-ldistributionofwetnessalongthestageandestimatetheefficiencyofthe… 相似文献
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IntroductionThe final stages of large steam turbines in fossilpower plant and all stages of turbines in nuclear powerp1ants operate in the wet steam region. It is important todevelop a simple direct method for measuring thewetness of flowing wet steam. The heating method hasmany advantages. First, compared with optical method,the measured wetness results of this method consist ofevery size of water droplets in wet steam flow. Second, itis not restricted to the measurement environment, it canb… 相似文献
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Juho ChungJoonsoo Kim Boyun JangYoungsoo Ahn Heon LeeWooyoung Yoon 《Solar Energy Materials & Solar Cells》2011,95(1):45-48
MG Si can be effectively refined using a fractional melting process. The efficiency of fractional melting depends on two parameters, the heating rate and the wetness. Generally, the heating rate should be slow to ensure impurity diffusion and, in order to perfectly separate the liquid from the solid/liquid mixture, there should not be higher wetness. Many MG Si metal impurities exhibit retrograde solubility. The metal impurity behaviors with retrograde solubility were studied during the FM process. The change of the microstructure during the process was also studied with a SEM and an EPMA. Due to the retrograde behavior, slow heating below the maximum solubility temperature was not necessary to refine MG Si. For the FM process, the operating temperature range to refine MG Si should be carefully selected considering the behavior of major metal impurities in the mushy zone. 相似文献
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