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HAT循环热力参数的优化选择 总被引:2,自引:0,他引:2
本文在文献〔1〕理论分析的基础上,通过一系列数值计算,详细研究了湿空气透平的初温T3、压缩比ε、回收度U、湿空气中蒸汽与空气的质量掺混倍率x对HAT循环的供电效率ηcc^N和比功W,以及燃气轮机的当量效率ηgt^0、蒸汽轮机的当量效率ηst与能量分配比值A的影响关系,它有助于我们优化选择了HAT循环的热力参数,并深入了解HAT循环的本质。 相似文献
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HAT循环的热力学分析 总被引:4,自引:3,他引:4
本文用热力学方法详细分析了湿空气透平循环(HAT)中供电效率ηcc^N和比功Ws^0的表达关系式,以及某些关键因素对它们的影响。它有助于人们深入了解HAT循环的本质,并在设计时合理地选择有关参数。 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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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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饱各器是HAT循环中的关键部件,对其性能的认识关系到整个系统的性能分析。由于饱和器内存在复杂的气液两相流动和相互间的传热质过程,其性能与很多参数有关,因此用一个或多个指标从一个或多个方面来评价饱和器性能问题一直是在研究的问题。本文使用了炯分析的方法,建立了饱和器炯衡模型,分析了内部炯损失,提出了性能评价的方法和4个评价指标:热力学完善度、炯效率、炯损系数和炯流密度变化率,通过这些评定准则可以对饱和器用能水平作出评价,为今后饱和器的设计和性能分析提供了参考。 相似文献
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航改燃气轮机具有压比高、效率高、可靠性高和结构紧凑等特点,它将航空发动机先进技术有效地应用于工业领域。以某型三轴航改燃气轮机为研究对象,对其不同的HAT循环改型方案进行了研究。建立了一种基于饱和曲线和工作线的饱和器模型,该模型避免使用难以准确获得的传热传质系数,利用饱和器实验数据对该模型进行了验证,结果表明:建立的饱和器模型具有较高的准确性,其中出口空气温度最大误差小于0.8%,出口湿度最大误差小于1.9%。此外,设计并仿真了3种不同结构形式的HAT循环方案,仿真结果表明:原始的压气机和透平特性不适合于改型后的HAT循环,它限制了HAT循环的效率和燃气轮机的输出功率(简称出功)。针对这一问题,提出了改进透平特性方案,该方案有效地解决了水蒸气的加入带来部件不匹配问题。在此基础上分析了3个HAT方案设计点的性能,结果表明方案2即在简单循环基础上加入了饱和器、经济器、回热器和中冷器是最佳的改型方案。 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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饱和器是HAT循环中的关键部件,对其性能的认识关系到整个系统的性能分析。运用的方法,计算了饱和器工质湿空气和水的值,分析了不同参考点的温度和湿度对值的影响规律,以及物理和化学扩散随湿空气温度的变化情况。通过建立饱和器平衡模型,采用了目的效率作为饱和器效率。计算结果表明:湿空气值随参考点的温度和湿度变化规律为:先减小,直到最低点为零,然后不断增加,值始终大于(等于)零,并且与参考点参数差距越大,值越大。当湿空气温度增加,物理所占比重减少,而化学扩散的比重增加,在到达一定温度后,化学大于物理。 相似文献
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In this paper, through introducing an external heat source to the conventional humid air turbine (HAT) cycle, we have studied the performances of the improved humid air gas turbine cycle mainly by exergy analysis method. In order to attain the performance of the humid air gas turbine with external heat source, we compare it with the conventional HAT cycle in detail with different factors such as the pressure ratio, turbine inlet temperature (TIT) and the external circulating water mass flow. The results showed that the specific work of the new system and the humidity ratio of saturator are all increased in some degree. For example, in the same pressure ratio and TIT, when the ratio of the external circulating water mass flow rate with that of the internal water is 0.2, the specific work increases more than 15.2 kJ kg−1a, and the humidity raises at least 2.0 percent points. By introducing the external circulating water into the system, though thermal efficiency of the new HAT cycle is lower than that of the conventional HAT cycle, the exergy efficiency exhibits different results. Generally, when the pressure ratio is over 8, the exergy efficiency for the proposed HAT cycle is higher than the conventional HAT cycle; while less than 8, whether or not the exergy efficiency increases will mainly depend on TIT. In addition, the exergy destructions of components in systems were investigated. Through the comparison of the new system with the conventional HAT cycle, it was found that the exergy loss proportion in combustion declines for the new system, and the proportion of exhaust loss increases. From the viewpoint of total energy system, the HAT cycle with utilization of external heat source is a beneficial way to improve the overall performances of energy utilization. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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《Applied Thermal Engineering》2003,23(10):1275-1293
In this paper a thermodynamic assessment and a preliminary cost evaluation are given for an evaporative gas turbine (EvGT) cycle packed humidifier. Both background theory and simulation results are included.Two different approaches were used for the humidifier system modelling: the full integration of the mass-energy balance and mass transfer equations (called SAT model), and an atmospheric cooling tower-based model (called CT model). Both approaches were used to perform component thermodynamic analyses and to determine the humidifier packing design.Within these approaches, two simulation cases are discussed: a test case, with experimental results from the pilot-plant of the University of Lund, and a case study of the saturators for the optimised HAT (humid air turbine) cycles of a plant with a 50 MW power output. The two cases presented consider two different operating conditions for the saturator: the first being a “non-optimised” saturator, and the later the “optimal” configuration with reduced exergetic losses. For the case study, the saturator design and cost evaluation are also included.All simulation results were performed with the in-house SAT (SATurator simulation tool) code. 相似文献