1000MW机组冷却水塔结构优化研究
发布时间：2018-08-20 14:10
【摘要】：为了优化内陆核电冷却塔的结构数据及其侧风下的热力性能。根据冷却塔气水热质传递原理,利用Fluent平台,建立了冷却塔的三维数值计算程序。该程序采用多孔介质模型处理填料层内气水的热质交换;淋水区和雨区则采用轨道颗粒模型计算;气水之间的阻力采用自定义函数方式加载。通过比较某1000MW火电机组的超大型冷却塔出塔水温的实测值和计算值,验证了程序的准确性。继而利用该程序进行1000MW火电机组冷却塔结构数据优化,结果表明:当喉部高度比为0.8033和喉部半径比为0.7时最优。又针对当前内陆核电冷却塔结构数据与现行规范不一致的现象,对内陆核电冷却塔的喉部高度,喉部半径和风筒喉部上部曲率进行优化。结果表明:在淋水面积一定时,当喉部高度比为0.8,喉部半径比为0.65,风筒喉部上部曲率为0.19时,该冷却塔外型处于最优。又为了提高侧风工况下冷却塔的进风效率,以内陆核电最优塔型为例,在夏季有风工况下,通过在进风口处加装整流板,引导空气进入雨区。为此,研究了整流板安装角度,数量,长度,弧型整流板和整流板的安装位置对出塔水温的影响。结果表明:当环境风速为2.13m/s时,整流板的最佳安装角度为45°;最优片数为20片,最优板长为8m,弧型整流板的弧度最高顶点到弦长距离的最优值为0.5m,弧型整流板到进风口的最佳安装距离为5m,冷却塔出塔水温降低了0.642℃;当环境风速为4m/s时,出塔水温降低了1.127℃;当环境风速为6m/s时,出塔水温降低的最多,达到了1.211℃。
[Abstract]:In order to optimize the structural data of inland nuclear power cooling tower and its thermodynamic performance under crosswind. According to the principle of gas-water heat and mass transfer in cooling tower, the three-dimensional numerical calculation program of cooling tower is established by using Fluent platform. The program uses porous media model to deal with the heat and mass exchange of gas and water in the packing layer, the flow zone and rain zone are calculated by the track particle model, and the resistance between air and water is loaded by custom function. The accuracy of the program is verified by comparing the measured and calculated values of the water temperature of a super large cooling tower of a 1000MW thermal power unit. Then the cooling tower structure data of 1000MW thermal power unit are optimized by this program. The results show that the optimum condition is when the throat height ratio is 0.8033 and the throat radius ratio is 0.7. Aiming at the phenomenon that the structure data of inland nuclear power cooling tower are inconsistent with the current code, the throat height, throat radius and the upper curvature of the duct are optimized. The results show that when the spray area is constant, when the throat height ratio is 0.8, the throat radius ratio is 0.65, and the upper curvature of the duct is 0.19, the cooling tower configuration is optimal. In order to improve the air intake efficiency of cooling tower under crosswind condition, taking the optimal tower type of inland nuclear power as an example, under the condition of summer wind, the air is guided into the rain area by installing rectifier board at the inlet. Therefore, the influence of installation angle, quantity, length, installation position of arc rectifier board and rectifier board on the water temperature of the tower is studied. The results show that when the ambient wind speed is 2.13m/s, the optimum installation angle of rectifier plate is 45 掳, and the optimum number of pieces is 20 pieces. The optimum plate length is 8 m, the optimum value of arc rectifier plate is 0.5 m from the highest radiance to the chord length, the best installation distance from the arc rectifier plate to the inlet is 5 m, and the water temperature of the cooling tower outlet is reduced by 0.642 鈩，
本文编号：2193896
[Abstract]:In order to optimize the structural data of inland nuclear power cooling tower and its thermodynamic performance under crosswind. According to the principle of gas-water heat and mass transfer in cooling tower, the three-dimensional numerical calculation program of cooling tower is established by using Fluent platform. The program uses porous media model to deal with the heat and mass exchange of gas and water in the packing layer, the flow zone and rain zone are calculated by the track particle model, and the resistance between air and water is loaded by custom function. The accuracy of the program is verified by comparing the measured and calculated values of the water temperature of a super large cooling tower of a 1000MW thermal power unit. Then the cooling tower structure data of 1000MW thermal power unit are optimized by this program. The results show that the optimum condition is when the throat height ratio is 0.8033 and the throat radius ratio is 0.7. Aiming at the phenomenon that the structure data of inland nuclear power cooling tower are inconsistent with the current code, the throat height, throat radius and the upper curvature of the duct are optimized. The results show that when the spray area is constant, when the throat height ratio is 0.8, the throat radius ratio is 0.65, and the upper curvature of the duct is 0.19, the cooling tower configuration is optimal. In order to improve the air intake efficiency of cooling tower under crosswind condition, taking the optimal tower type of inland nuclear power as an example, under the condition of summer wind, the air is guided into the rain area by installing rectifier board at the inlet. Therefore, the influence of installation angle, quantity, length, installation position of arc rectifier board and rectifier board on the water temperature of the tower is studied. The results show that when the ambient wind speed is 2.13m/s, the optimum installation angle of rectifier plate is 45 掳, and the optimum number of pieces is 20 pieces. The optimum plate length is 8 m, the optimum value of arc rectifier plate is 0.5 m from the highest radiance to the chord length, the best installation distance from the arc rectifier plate to the inlet is 5 m, and the water temperature of the cooling tower outlet is reduced by 0.642 鈩，
本文编号：2193896
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