Advancing Tube Receiver Performance by Using Corrugated Tubes
Advancing Tube Receiver Performance by Using Corrugated Tubes
复制标题
使用波纹管提高管接收器性能
DOI：
10.1016/j.egypro.2015.03.065
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Jens Rheinländer
中科院分区：
文献类型：
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作者：
R. Uhlig;Birgit Gobereit;Jens Rheinländer
使用太阳能塔系统将太阳能直接引入到布雷顿循环中能够实现太阳能的高效转换，特别是当使用组合循环时。这种太阳能燃气涡轮机系统的一个关键部件是接收器。高的和不均匀的热通量构成了这种接收器的设计的主要挑战。接收器的一种可能的设计使用直接照射的金属管排列在一个绝缘cavity.The本文介绍了一项研究的结果，比较不同的吸收管尺寸和数量的平行管的热液压吸收管的布局。使用的平行管越多，流体流动的速度就越低，并且以相同的方式降低传热系数。这导致较高的壁温度，并因此导致较低的接收器效率。为了研究不同结构的波纹管对换热性能和压降的影响，建立了一套波纹管热工水力试验台，并利用CFD模拟对螺旋肋管的几何形状进行了优化。设计目标是在不超过涡轮机允许压降的情况下获得高传热系数。基于SOLUGAS接收器的设计方案，对某管式接收器进行了改进，并利用热场有限元模型对不同接收器设计方案的温度场和效率进行了分析。模型中考虑了太阳辐射、流体对流、辐射交换、对流和传导损失。结果发现，接收器效率约0.719（在设计点）可以增加到0.835，通过使用更多的平行吸收器管比需要满足的压降限制。
Direct introduction of solar energy into a Brayton cycle using Solar Tower systems enables a highly efficient conversion of the solar energy, especially so when combined cycles are used. One key component of such a solar gas turbine system is the receiver. High and inhomogeneous heat fluxes pose the main challenge for the design of such receivers. One possible design of the receiver uses directly irradiated metallic tubes arranged in an insulated cavity.The paper presents the results of a study comparing thermo hydraulic absorber tube layouts with varying absorber tube dimensions and number of parallel tubes. The more parallel tubes are used the lower is the velocity of the fluid flow and in the same way the heat transfer coefficient is reduced. This leads to higher wall temperatures and therefore to a lower receiver efficiency. Using corrugated tubes instead of smooth tubes gives the possibility to increase the heat transfer coefficient.A thermo hydraulic test bench was developed in order to analyze the influence of different structures of corrugated tubes on heat transfer capability and pressure drop.The geometry of helicallyribbed tubes was optimized using CFD modelling. Design goal was a high heat transfer coefficient without exceeding the allowed pressure drop of the turbine. The resultingconfigurations were used to improve a tubular receiver based on the SOLUGAS receiver design.A thermal FEM model was used to analyze the temperature field and the efficiency of the different receiver designs. Solar radiation, convection to fluid, radiation exchange, convective and conductive losses were considered in the model. It was found that the receiver efficiency of about 0.719 (at design point) could be increased up to 0.835 by using more parallel absorber tubes than needed to fulfill the pressure drop limit.