發(fā)布時(shí)間：2018-08-20 14:10

【摘要】：為了優(yōu)化內(nèi)陸核電冷卻塔的結(jié)構(gòu)數(shù)據(jù)及其側(cè)風(fēng)下的熱力性能。根據(jù)冷卻塔氣水熱質(zhì)傳遞原理,利用Fluent平臺,建立了冷卻塔的三維數(shù)值計(jì)算程序。該程序采用多孔介質(zhì)模型處理填料層內(nèi)氣水的熱質(zhì)交換;淋水區(qū)和雨區(qū)則采用軌道顆粒模型計(jì)算;氣水之間的阻力采用自定義函數(shù)方式加載。通過比較某1000MW火電機(jī)組的超大型冷卻塔出塔水溫的實(shí)測值和計(jì)算值,驗(yàn)證了程序的準(zhǔn)確性。繼而利用該程序進(jìn)行1000MW火電機(jī)組冷卻塔結(jié)構(gòu)數(shù)據(jù)優(yōu)化,結(jié)果表明:當(dāng)喉部高度比為0.8033和喉部半徑比為0.7時(shí)最優(yōu)。又針對當(dāng)前內(nèi)陸核電冷卻塔結(jié)構(gòu)數(shù)據(jù)與現(xiàn)行規(guī)范不一致的現(xiàn)象,對內(nèi)陸核電冷卻塔的喉部高度,喉部半徑和風(fēng)筒喉部上部曲率進(jìn)行優(yōu)化。結(jié)果表明:在淋水面積一定時(shí),當(dāng)喉部高度比為0.8,喉部半徑比為0.65,風(fēng)筒喉部上部曲率為0.19時(shí),該冷卻塔外型處于最優(yōu)。又為了提高側(cè)風(fēng)工況下冷卻塔的進(jìn)風(fēng)效率,以內(nèi)陸核電最優(yōu)塔型為例,在夏季有風(fēng)工況下,通過在進(jìn)風(fēng)口處加裝整流板,引導(dǎo)空氣進(jìn)入雨區(qū)。為此,研究了整流板安裝角度,數(shù)量,長度,弧型整流板和整流板的安裝位置對出塔水溫的影響。結(jié)果表明:當(dāng)環(huán)境風(fēng)速為2.13m/s時(shí),整流板的最佳安裝角度為45°;最優(yōu)片數(shù)為20片,最優(yōu)板長為8m,弧型整流板的弧度最高頂點(diǎn)到弦長距離的最優(yōu)值為0.5m,弧型整流板到進(jìn)風(fēng)口的最佳安裝距離為5m,冷卻塔出塔水溫降低了0.642℃;當(dāng)環(huán)境風(fēng)速為4m/s時(shí),出塔水溫降低了1.127℃;當(dāng)環(huán)境風(fēng)速為6m/s時(shí),出塔水溫降低的最多,達(dá)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 擄, 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，

本文編號：2193896