湿式自然通风冷却塔若干设计问题探讨王明韧PPT课件下载推荐.ppt
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湿式自然通风冷却塔若干设计问题探讨王明韧PPT课件下载推荐.ppt
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(2)Db:
塔底直径,一般指斜支柱中心线在0.00m标高的直径。
(3)Ht:
塔高,以冷却塔0.00m为基准计算的塔顶高度。
(4)Hi:
进风口高,进风口底坎(通常是集水池墙顶标高)至风筒壳体底的高度。
(5)Hf:
填料高度(6)Dth:
喉部直径(7)Hth:
喉部高度(8)Do:
出口直径(9)c:
塔筒斜支柱中心面和垂直面的夹角。
(10)t:
塔筒顶部出口顶部壳体中心旋转面与垂直面的夹角。
(11)冷却塔淋水填料布置的型式,采用搁置型还是悬吊型DbDfDthDoHtHfHiatacu塔底直径Db作为基准值初步确定的条件u塔高与塔底直径之比RAUZ(Ht/Db)u喉部直径与塔底直径之比RAUC(Dth/Db)u进风口高度与塔底直径之比RAUL(Hi/Db)u填料高度RAUE(Hf)三项主要比值及一项变化值作为塔型的主要参数,最终以5项主要参数来定冷却塔塔型,即塔底直径Db、塔高Ht、塔喉部直径Dth、进风口高度Hi、填料高度Hfu进行热力、结构计算、塔芯及结构工程量计算及经济计算,以技术经济组合排序来确定冷却塔塔型的。
u填料型式及布置作为单项定型输入参数。
冷却塔塔型参数优化以某工程660MW燃煤机组为例,该工程采用带自然通风冷却塔的循环供水系统,该工程完成了供水系统优化,也初步确定了如下技术参数:
1、冷却水量2、凝汽器的换热面积、流程数、壳体与背压个数,凝汽器内冷却水管的材质、管径、壁厚、根数和长度等3、循环水泵及所配电动机的规格、台数4、进排水管、沟的材料、断面尺寸、条数5、进、排水建筑物的规模6、自然通风冷却塔的高度、淋水面积、进风口高度等主要几何尺寸,冷却塔塔内供水高度、填料型式、填料高度及布置等。
7、根据供水系统优化的计算初步结果,其要求复核在夏季冷却塔的最高冷却水温(出塔水温),该工程冷却水量及温降分别为80712m3/h和9.5,并且要求出塔水温低于等于33.20,经过冷却塔热力计算,能满足上述要求的冷却塔如表1-1所示,表1-1中所有阴影部分塔型均可满足上述要求。
冷却塔塔型参数优化案例第一组大气压干球温度湿球温度相对湿度循环水量温降配水管高度集水池直径淋水与出口面积比995.1hpa29.926.60.7180712m3/h9.512.75m106.3752.56塔底直径淋水面积塔高有效高RAUZ(Ht/Db)喉部直径进风口高进风口上缘直径填料高出塔水温mm2mmmmmm104.3758309125.25114.131.260.579.8100.081.2533.9104.3758309130.47119.341.2560.579.8100.081.2533.75104.3758309135.69124.561.360.579.8100.081.2533.6104.3758309140.91129.781.3560.579.8100.081.2533.46104.3758309146.131351.460.579.8100.081.2533.33104.3758309151.34140.221.4560.579.8100.081.2533.21104.3758309156.56145.441.560.579.8100.081.2533.09104.3758309161.78150.661.5560.579.8100.081.2532.97104.3758309167155.881.660.579.8100.081.2532.86第二组大气压干球温度湿球温度相对湿度循环水量温降配水管高度集水池直径淋水与出口面积比995.1hpa29.926.60.7180712m3/h9.512.75m107.3752.56塔底直径淋水面积塔高有效高度RAUZ喉部直径进风口高度进风口上缘直径填料高度出塔水温()mm2mmmmmm105.3758388126.45115.331.261.159.8101.041.2533.83105.3758388131.72120.591.2561.159.8101.041.2533.68105.3758388136.99125.861.361.159.8101.041.2533.54105.3758388142.26131.131.3561.159.8101.041.2533.4105.3758388147.53136.41.461.159.8101.041.2533.27105.3758388152.79141.671.4561.159.8101.041.2533.14105.3758388158.06146.941.561.159.8101.041.2533.03105.3758388163.33152.211.5561.159.8101.041.2532.91105.3758388168.6157.481.661.159.8101.041.2532.8第一组出水温度变化1.04,RAUZ=1.2-1.5为0.81第二组出水温度变化1.03,RAUZ=1.2-1.5为0.80冷却塔底部直径Db(淋水面积Af)不变,塔高Ht与底部直径Db之比RAUZ对冷却塔出水温度的影响趋势表1-1大气压干球温度湿球温度相对湿度循环水量温降配水管高度集水池直径淋水与出口面积比995.1hpa29.926.60.7180712m3/h9.512.75m2.56塔底直径淋水面积塔高有效高度RAUZ(Ht/Db)喉部直径进风口高度进风口上缘直径填料高度出塔水温()mm2mmmmmm104.3758309151.34140.221.4560.579.8100.081.2533.21105.3758388152.79141.671.4561.159.8101.041.2533.14106.3758468148.93137.81.461.739.81021.2533.21107.3758548150.33139.21.462.319.8102.961.2533.15108.3758627146.31135.181.3562.899.8103.921.2533.21109.3758707147.66136.531.3563.479.8104.881.2533.15110.3758787143.49132.361.364.059.8105.841.2533.23111.3758866144.79133.661.364.639.8106.791.2533.17112.3758946140.47129.341.2565.219.8107.751.2533.25113.3759025141.72130.591.2565.799.8108.711.2533.2冷却塔底部直径Db(淋水面积Af)变化,不同的塔高Ht与底部直径Db之比RAUZ,满足冷却塔出塔水温33.20汇总表1-2第一组大气压干球温度湿球温度相对湿度循环水量温降配水管高度集水池直径淋水与出口面积比995.1hpa29.926.60.7180712m3/h9.5114.3752.56塔底直径(Db)淋水面积塔高有效高喉部直径进风口高(Hi)RAUL(Hi/Db)进风口上缘直径填料高出塔水温mm2mmmmHi/Dbmm112.3758946134.85125.6665.217.870.07107.751.2533.9112.3758946134.85125.165.218.430.075107.751.2533.74112.3758946134.85124.5465.218.990.08107.751.2533.59112.3758946134.85123.9765.219.550.085107.751.2533.45112.3758946134.85123.4165.2110.110.09107.751.2533.33112.3758946134.85122.8565.2110.680.095107.751.2533.21112.3758946134.85122.2965.2111.240.1107.751.2533.11第二组大气压干球温度湿球温度相对湿度循环水量温降配水管高度集水池直径淋水与出口面积比995.1hpa29.926.60.7180712m3/h9.512.75m114.3752.56塔底直径(d)淋水面积塔高有效高喉部直径进风口高(h)RAUL进风口上缘直径填料高出塔水温mm2mmmmHi/Dbmm112.3758946140.47131.2865.217.870.07107.751.2533.76112.3758946140.47130.7265.218.430.075107.751.2533.6112.3758946140.47130.1565.218.990.08107.751.2533.45112.3758946140.47129.5965.219.550.085107.751.2533.31112.3758946140.47129.0365.2110.110.09107.751.2533.18112.3758946140.47128.4765.2110.680.095107.751.2533.06112.3758946140.47127.9165.2111.240.1107.751.2532.96第一组RAUL=0.07-0.10出水温度变化为0.79。
第二组RAUL=0.07-0.10出水温度变化为0.80。
冷却塔底部直径Db(淋水面积Af)变化,进风口高度Hi与底部直径Db之比RAUL对冷却塔出水温度的影响趋势表1-3大气压干球温度湿球温度相对湿度循环水量温降配水管高度集水池直径淋水与出口面积比995.1hpa29.926.60.7180712m3/h9.5114.3752.56塔底直径(Db)淋水面积塔高有效高喉部直径进风口高(Hi)RAUL(Hi/Db)进风口上缘直径填料高出塔水温mm2mmmmHi/Dbmm112.3758946134.85122.8565.2110.680.095107.751.2533.21112.3758946140.47129.0365.2110.110.09107.751.2533.18112.3758946146.09135.2165.219.550.085107.751.2533.18112.3758946151.71141.465.218.990.08107.751.2533.19112.3758946157.33147.5865.218.430.075107.751.2533.22113.3759025136.05124.5265.7910.20.09108.711.2533.25113.3759025141.72130.7665.799.640.085108.711.2533.23113.3759025147.3913765.799.070.08108.711.2533.24113.3759025153.06143.2365.798.50.075108.711.2533.26113.3759025158.73148.965.798.50.075108.711.2533.14冷却塔底部直径Db(淋水面积Af)变化,不同的塔高Ht,不同的进风口高度Hi与底部直径Db之比RAUL,满足冷却塔出塔水温33.20汇总表1-4从上表1-2也可以看出在冷却塔淋水面积变
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