水蓄冷斜温层生长过程及抑制方法研究
发布时间：2018-08-23 10:38
【摘要】：随着社会经济的不断发展,电力消耗也在持续的增加,同时电力需求出现用电高峰负荷增长过快,电网负荷不平衡,峰谷负荷差越来越大的新特点,蓄能技术是需求侧调峰的有效途径。本文研究自然分层型水蓄冷斜温层生长过程,以方形蓄冷水槽为应用背景,针对H型条缝布水器存在消耗管材管件量大、释冷存在死区、水力失调、布水不均等问题,设计了方形布水器,并在方形布水器基础上进行结构优化,以达到提升布水器性能的目的。本文建立了蓄冷/释冷实验系统,对H型条缝布水器和方形布水器进行了不同流量下的蓄冷/释冷实验,测试水槽内垂直方向上温度的逐时变化。建立流动可视化实验台,对方形布水器进行流动可视化研究,提出方形布水器的改进措施,设计出了出口百叶+开孔方形布水器,并对其进行了与H型条缝布水器和方形布水器同等条件下的蓄冷/释冷实验。根据三种布水器的蓄冷/释冷实验数据,从温度波动、斜温层厚度、斜温层厚度变化率、初始斜温层厚度以及半循环完善度(FOM1/2)五个方面对三种布水器进行性能对比研究。由于蓄冷/释冷实验只能确定温度参数,不能从布水器的流动特性方面进行更深入的研究,因此对出口百叶+开孔方形布水器建立数学模型,进行数值模拟计算,并将数值模拟结果与实验结果进行对比,以确定数值模拟的准确性。根据出口百叶+开孔方形布水器的数值模拟结果,提出调整百叶位置和优化布水器内部流动通道结构的改进措施,对改进型布水器进行数值模拟计算,并对改进效果进行评价。根据实验结果,可以发现蓄冷过程形成的水流掺混强于释冷过程,并且蓄冷/释冷过程中斜温层的温度分布符合偏态函数的分布函数,斜温层厚度呈先减小后增大的变化趋势,流量较小时初始斜温层较薄,斜温层厚度逐时增加,当流量较大时,水流掺混使得初始斜温层较厚,待斜温层稳定后斜温层厚度逐时增加。对三种布水器的性能对比,可以发现出口百叶+开孔方形布水器能够有效的降低蓄冷过程中水流掺混,蓄冷半循环完善度(FOM1/2.charge)在流量为920L/h时最大为91%,而条缝型布水器和方形布水器在流量为720L/h时最大为87%,最佳蓄冷效率和最佳蓄冷效率对应流量都得到提高;释冷过程中,条缝型布水器的性能最好,而出口百叶+开孔方形布水器不适用于流量大于920L/h的情况,在释冷过程中方形布水器可以代替出口百叶+开孔方形布水器使用。根据数值模拟结果,调整百叶位置和优化布水器内部流动通道结构后的改进型方形布水器能够有效的较小水流掺混,提高斜温层稳定性,从而提高蓄冷水槽效率。
[Abstract]:With the development of society and economy, the consumption of electric power is increasing continuously. At the same time, the demand of electricity increases too fast, the load of power grid is unbalanced, and the load difference between peak and valley is more and more big. Energy storage technology is an effective way to adjust peak on demand side. In this paper, the growth process of natural stratified water storage cooling inclined temperature layer is studied. Taking the square storage tank as the application background, the H type water distributor has the problems of large consumption of pipe fittings, dead zone of cold release, imbalance of hydraulic power and uneven distribution of water. The square water distributor is designed and optimized on the basis of the square water distributor to improve the performance of the water distributor. In this paper, a cold storage / release experiment system has been established, and the cold storage / cooling release experiments have been carried out on H slit water dispensers and square water dispensers with different flow rates. The temperature variation in vertical direction in the flume has been measured time by time. The flow visualization experiment bench was set up, the flow visualization of the square water distributor was studied, the improvement measures of the square water distributor were put forward, and the outlet shutter square water distributor was designed. The cold storage / cooling release experiments were carried out under the same conditions as H slit water dispensers and square water dispensers. Based on the experimental data of cold storage / cooling release of three water dispensers, the performances of the three water dispensers were compared and studied from five aspects: temperature fluctuation, variation rate of inclined temperature layer thickness, initial inclined temperature layer thickness and semi-cycle perfection (FOM1/2). Because the temperature parameters can only be determined in the cold storage / release experiment, the flow characteristics of the water dispenser can not be studied more deeply, so the mathematical model of the outlet shutter square water distributor is established and the numerical simulation is carried out. The accuracy of the numerical simulation is determined by comparing the numerical simulation results with the experimental results. According to the numerical simulation results of the outlet shutter square water dispenser, the improvement measures of adjusting the position of the shutter and optimizing the flow channel structure of the water distributor are put forward, and the improved water distributor is numerically simulated and calculated, and the improved effect is evaluated. According to the experimental results, it can be found that the mixing of water in the cold storage process is stronger than that in the cold release process, and the temperature distribution of the inclined temperature layer accords with the distribution function of the skew temperature function during the cold storage / release process, and the thickness of the inclined temperature layer decreases first and then increases. When the flow rate is small, the initial inclined temperature layer is thinner, and the thickness of the inclined temperature layer increases time by hour. When the flow rate is larger, the initial inclined temperature layer is thicker when the flow rate is large, and the thickness of the inclined temperature layer increases time by hour after the inclined temperature layer is stabilized. By comparing the performance of three kinds of water dispensers, it can be found that the outlet shutter square water dispenser can effectively reduce the mixing of water flow during the process of cold storage. The maximum of FOM1/2.charge is 91 when the flow rate is 920L/h, while the maximum of slit water distributor and square water distributor is 87 when the flow rate is 720L/h, the optimum storage efficiency and the best storage efficiency are both improved. The slotted water distributor has the best performance, but the outlet shutter square water distributor is not suitable for the case where the flow rate is larger than 920L/h. In the process of cooling release, the square water distributor can replace the outlet shutter square water distributor. According to the results of numerical simulation, the improved square water dispenser after adjusting the position of the louver and optimizing the flow channel structure of the water distributor can effectively mix small water flow, improve the stability of the inclined temperature layer, and thus improve the efficiency of the storage tank.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU831
本文编号：2198824
[Abstract]:With the development of society and economy, the consumption of electric power is increasing continuously. At the same time, the demand of electricity increases too fast, the load of power grid is unbalanced, and the load difference between peak and valley is more and more big. Energy storage technology is an effective way to adjust peak on demand side. In this paper, the growth process of natural stratified water storage cooling inclined temperature layer is studied. Taking the square storage tank as the application background, the H type water distributor has the problems of large consumption of pipe fittings, dead zone of cold release, imbalance of hydraulic power and uneven distribution of water. The square water distributor is designed and optimized on the basis of the square water distributor to improve the performance of the water distributor. In this paper, a cold storage / release experiment system has been established, and the cold storage / cooling release experiments have been carried out on H slit water dispensers and square water dispensers with different flow rates. The temperature variation in vertical direction in the flume has been measured time by time. The flow visualization experiment bench was set up, the flow visualization of the square water distributor was studied, the improvement measures of the square water distributor were put forward, and the outlet shutter square water distributor was designed. The cold storage / cooling release experiments were carried out under the same conditions as H slit water dispensers and square water dispensers. Based on the experimental data of cold storage / cooling release of three water dispensers, the performances of the three water dispensers were compared and studied from five aspects: temperature fluctuation, variation rate of inclined temperature layer thickness, initial inclined temperature layer thickness and semi-cycle perfection (FOM1/2). Because the temperature parameters can only be determined in the cold storage / release experiment, the flow characteristics of the water dispenser can not be studied more deeply, so the mathematical model of the outlet shutter square water distributor is established and the numerical simulation is carried out. The accuracy of the numerical simulation is determined by comparing the numerical simulation results with the experimental results. According to the numerical simulation results of the outlet shutter square water dispenser, the improvement measures of adjusting the position of the shutter and optimizing the flow channel structure of the water distributor are put forward, and the improved water distributor is numerically simulated and calculated, and the improved effect is evaluated. According to the experimental results, it can be found that the mixing of water in the cold storage process is stronger than that in the cold release process, and the temperature distribution of the inclined temperature layer accords with the distribution function of the skew temperature function during the cold storage / release process, and the thickness of the inclined temperature layer decreases first and then increases. When the flow rate is small, the initial inclined temperature layer is thinner, and the thickness of the inclined temperature layer increases time by hour. When the flow rate is larger, the initial inclined temperature layer is thicker when the flow rate is large, and the thickness of the inclined temperature layer increases time by hour after the inclined temperature layer is stabilized. By comparing the performance of three kinds of water dispensers, it can be found that the outlet shutter square water dispenser can effectively reduce the mixing of water flow during the process of cold storage. The maximum of FOM1/2.charge is 91 when the flow rate is 920L/h, while the maximum of slit water distributor and square water distributor is 87 when the flow rate is 720L/h, the optimum storage efficiency and the best storage efficiency are both improved. The slotted water distributor has the best performance, but the outlet shutter square water distributor is not suitable for the case where the flow rate is larger than 920L/h. In the process of cooling release, the square water distributor can replace the outlet shutter square water distributor. According to the results of numerical simulation, the improved square water dispenser after adjusting the position of the louver and optimizing the flow channel structure of the water distributor can effectively mix small water flow, improve the stability of the inclined temperature layer, and thus improve the efficiency of the storage tank.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU831
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