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HAT循环是一种先进的热力循环,具有高效率、高比功、低花费、低污染的良好性能,被誉为21世纪最有竞争力的动力循环。本文综述了HAT循环的关键部件饱和器的研究概况,指出了目前饱和器研究的一些成果和今后研究的重点。 相似文献
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对逆流喷雾式饱和器内部空气的湿化过程进行实验研究,实验中不仅测量了饱和器进出口湿空气的相对湿度、温度和水的温度,而且也测量了饱和器内部几个高度截面上湿空气的相对湿度和气相、液相的温度。根据实验测量的湿空气的相对湿度和温度,计算出了饱和器内湿空气的含湿量和测量高度间湿空气的加湿量。由实验结果可见,随水气质量比的增大,饱和器出口湿空气的温度和温升也相应增大。湿空气的含湿量和水的蒸发量、出口温度随进口水温升高、水气质量比增大而增大。在所有实验工况下,饱和器出口湿空气接近或达到饱和。随空气速度增大水滴逃逸量增大。总体上饱和器内部下部主要是加湿进口空气,上部是加湿和加热空气。 相似文献
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饱和器是湿空气透平(HAT)循环的主要部件之一,它的主要作用是加热加湿空气,从而提高整个HAT循环的效率和比功。利用IAPWS-IF97提供的水和水蒸气性质与实际气体状态方程,建立了适用高压条件下饱和器的一维传热传质数学模型;利用该模型计算了不同压力条件下的饱和器工作性能,并分析了饱和器内的传热传质过程中,饱和点的位置、出口性能参数的变化规律,以及能效值的变化,可以供饱和器的设计参考。 相似文献
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以单膜理论为基础,研究了饱和器内水与空气之间传热传质的过程,引入水膜热阻修正系数K的概念,建立了饱和器传热传质一维计算模型.通过数值模拟计算,分析了K对饱和器性能的影响,并确定了K设计值的取值范围.结果表明:饱和器出口水温、出口气温和出口空气含湿量受K设计值影响明显,K设计值越大,出口气温和出口空气含湿量越高,出口水温则越低;K设计值取得太小,水温和水膜温度相差较大,计算出的空气出口参数会偏小,反之,水膜温度几乎等于水温,计算出的空气出口参数会偏大,K设计值取15~100中的某一个值较为合理. 相似文献
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讨论了Lewis因子和Lewis数两个不同概念的区别和联系,Lewis因子,也叫Lewis关系,表示蒸发过程中传热和传质的对比关系;建立了饱和器的一维数学模型,通过数值计算分析了Lewis因子对饱和器数值模拟结果的影响. 相似文献
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模型饱和器冷态喷雾场的实验研究 总被引:4,自引:3,他引:4
针对HAT循环关键部件增湿饱和器内典型的传热,传质过程现象,为了最优化该过程和为今后数值分析提供有效的数据,设计了模拟饱和顺内传热,传质过程中的开放式冷态实验系统。使用相位多普勒分析仪DualPDA(Phase Doppler Analyzer)对冷态模型饱和器的喷雾场进行了详细的实验研究,测量了不同水压,不同气流速度下的喷雾场,得到喷雾场内液滴的三维平均速度分布,脉动速度分布,平均粒径大小分布等,分析了喷雾水压和鼓风气流速度对喷雾场的影响,分析结果表明,改良设计的离心喷嘴具用良好的喷雾性能和轴对称性,水压增大可以增大喷雾场中粒子速度,通量及降低平均直径,喷嘴喷雾长度随气流速度减小,气流速度可以改变喷雾场的分布,有利于液滴蒸发和液滴破裂。 相似文献
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《Applied Thermal Engineering》2014,62(2):513-519
Humid air turbine (HAT) cycle is an advanced power generation system, and its efficiency and output power are improved by humidifying the compressed air. This humidification process is completed in the saturator. Therefore, the humidifying performance of saturator has great influence on the performance of HAT cycle. In this work, a new type packing saturator was designed and a series of experiments were carried out to study its humidifying performance. In order to improve the uniformity of the saturator inlet, a twin-tangential annular flow gas distributor was designed. Then it was authorized by China invention patents (ZL201010200778.9). Now, the mal-distribution factor of inlet air is mainly between 0.15 and 0.35 in all experimental conditions. Some key parameters of air and water at the inlet and outlet of saturator were measured at different experimental conditions. These results show the outlet humid air temperature is an important parameter for determining the humidifying amount of the saturator. The humidifying performance of the saturator is mainly affected by the inlet water temperature and the liquid/gas (L/G) ratio. At the same operating pressure, the humidity ratio of outlet humid air increases with inlet water temperature and L/G ratio. At higher inlet water temperature, the L/G ratio has a greater effect on the humidity ratio of outlet humid air. The outlet water temperature is mainly affected by the inlet gas temperature. With the increasing of inlet air temperature, the outlet water temperature increases, and it is close to the wet-bulb temperature of inlet air. 相似文献
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An experiment investigation of inner two-phase flow in the counter-flow spray saturator (CFSS) for humid air turbine (HAT) cycle and the simulation of the moving distance of water droplets in counter-flow air are presented here aimed at the understand of two-phase flow in the CFSS in detailed. Dual phase Doppler anemometry (DualPDA) system is applied to obtain the spatial change of the droplet size spectrum in the flow-field to correlate droplet size–velocity correlation. The local measurement profiles of 3D mean velocities and diameters of water droplets are obtained by averaging droplet size classes. Moreover, DualPDA signal processing allows for accurate determination of the volume flux of spherical water droplets. The transient velocity fields are measured by a laser-based particle image velocimetry (PIV) system. The commercial CFD software, FLUENT, is used to simulate the maximum moving distance of water droplets with different diameters and inlet velocities in the counter-flow air with different inlet velocities, then the quantity of water droplet entrainment in the saturator can be estimated. 相似文献
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The numerical simulations of simultaneous heat and mass transfer process in the counter-flow spray saturator and humid air turbine cycle are carried out in this work, according to the experimental conditions and actual size of a prototype saturator. This humidifying process involves two-phase flow of air and water droplets, also including interaction, breakup and collision of water droplets. Eulerian approach is used for gas phase flow, Lagrangian approach is used for liquid phase flow, and the two-way coupling is used between two phases. The simulations agree well with the experimental measurements. The simulations show the flow is with high turbulence intensity, the relative humidity and temperature of humid air increase along with the height of saturator, some water droplets carried by air escape from the saturator, and the humid air is mainly humidified at the lower part of saturator and is simultaneously humidified and heated at the upper part. 相似文献
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HAT循环仿真模型研究综述与展望 总被引:4,自引:1,他引:4
文中介绍了新型高效热力循环——HAT循环的概念、优点,以及国内外对HAT循环仿真模型的研究现状,在此基础上提出了建立HAT循环动态仿真模型的必要性和可行性。 相似文献