折板絮凝-池设计计算书

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-1-折板絮凝工艺设计计算书一、主要采用数据1.水厂规模为10000m3/d,考虑到5%自用水量,则净水处理总水量应为:smhmdtQ/122.0/5.437/1050005.11000033;2.絮凝区有效尺寸为8.82m×3.0m×5.30m,有效水深为5.0m;3.絮凝池的布置:将絮凝池分为8格,前7格净宽度为0.8m,第8格净宽度0.6m,1~3格采用异波折板,3~6格采用同波折板,7~8采用平行直板。第一段V1=0.30m/s,V2=0.20m/s,V3=0.12m/s。4.板宽采用500mm,板厚为10mm,折板夹角采用90。二、主要计算、校核过程1.第一段絮凝区:折板间距,则峰距b1:)(51.030.08.0122.0b1m谷距b2:)(22.12355.051.0b2m侧边峰距b3:)(0.882)007.0355.0(251.010.33mb侧边谷距b4:)(24.1355.088.04mb中间部分谷速v2:)/(125.022.18.0122.02sm侧边峰速v1’:)/(173.08.088.0122.0'1sm侧边谷速v2’:)/(123.08.024.1122.0'2sm水头损失计算:(1)中间部分:渐放段损失:)(0019.062.19125.03.05.02h22222111mg-2-渐缩段损失:)(0031.081.923.0])22.151.0(1.01[222mh絮凝区第一区通道数为3,竖向布置上两相对折板共有5个渐缩和渐放,共1对,则第一段絮凝区相对折板中间部分总水头损失为:)(025.0)0031.00019.0(15hm(2)侧边部分:渐放段损失:)(00038.081.92123.0173.05.0'221mh渐缩段损失:)(00091.081.92173.0])24.188.0(1.01['222mh每格侧边共有10个渐缩和渐放,故第一区絮凝区相对折板侧边部分总水头损失为:)(0129.0)00091.000038.0(25'hm(3)转弯和孔洞的水头损失:共1个进口,1个上转弯和1个下转弯,上转弯H4处水深0.5m,下转弯处水深H3位0.5m。第一格进口流速取1.0m/s;第二、三格过孔流速均取0.25m/s上转弯阻力系数0.38.1下上,上转弯流速为:)/(305.08.05.0122.0vsm上下转弯流速为:)/(053.08.05.0122.0vsm下则转弯的水头损失:)(0023.081.92305.00.381.92305.08.1h22mt孔的水头损失:)(172.081.920.10.381.9252.00.32'h22mt-3-(4)总水头损失:)293.0172.0)0023.02910.0025.03mH((第一段絮凝区停留时间T1:)min(94.45.437600.50.38.031T第一段絮凝区G1值:)(01.9894.4029.11060932.0100014-1sG2.第二段絮凝区:第二段絮凝区采用同波折板。(1)第二段的第一格:板间流速取0.20m/s;中间峰距b1:0.762m;中间谷距b2:1.472m;侧边峰距b3:)(76.02)007.0355.0(2762.010.33mb侧边谷距b4:)(12.1355.076.04mb中间部分谷速v2:)/(103.0472.18.0122.02sm侧边峰速v1’:)/(20.08.076.0122.0'1sm侧边谷速v2’:)/(136.08.021.1122.0'2sm1)同波折板中间部分间水头损失:)(0.001281.9220.06.0g2h21112mV絮凝区第二区第一格通道数为3,共1对折板,转弯数为9,则第一段絮凝区平行折板中间部分总水头损失为:)(011.00012.091hm2)侧边部分:)(0013.081.9221.06.0g2'h21122mV侧边部分总水头损失为:)(0234.00013.092hm-4-3)孔洞的水头损失:共1个进口,1个上转弯和1个下转弯,上转弯H4处水深0.7m,下转弯处水深H3位0.7m。进口流速取0.17m/s;上转弯阻力系数0.38.1下上,上转弯流速为:)/(22.08.07.0122.0vsm上下转弯流速为:)/(0.228.07.0122.0vsm下则转弯和孔洞的水头损失:)(016.081.9217.00.381.9222.00.3181.9222.08.1h222mt第1格总的水头损失:)(050.0016.00234.0011.01mH(2)第二段第二格和第三格水头损失计算:板间流速取0.20m/s;中间峰距b1:0.762m;中间谷距b2:1.472m;侧边峰距b3:)(50.12)007.0355.0(3762.0262.53mb侧边谷距b4:)(855.1355.005.14mb中间部分谷速v2:)/(10.0724.18.0122.02sm侧边峰速v1’:)/(10.08.005.1122.0'1sm侧边谷速v2’:)/(082.08.0558.1122.0'2sm絮凝区第二区第二格通道数均为4,共2对,转弯数为9,1)则第一段絮凝区平行折板中间部分总水头损失为:)(022.00012.092h1m2)侧边部分水头损失为:)(0003.081.9201.06.0g2'h21122mV)(0054.00003.092hm-5-3)转弯和孔洞的水头损失:共1个进口,2个上转弯和1个下转弯,上转弯H4处水深0.7m,下转弯处水深H3位0.7m。进口流速取0.17m/s;上转弯阻力系数0.38.1下上,上转弯流速为:)/(22.08.07.0122.0vsm上下转弯流速为:)/(0.228.07.0122.0vsm下则转弯和孔洞的水头损失:)(021.081.9217.00.381.9222.00.3181.9222.08.12h222mt第2格和第3格总水头损失:)(097.0)021.00054.0022.0(22mH4)第二段絮凝区总水头损失:0.147m(3)第二段絮凝区停留时间T2:)min(8.75.437600.50.38.05.437600.562.58.022T(4)第二段絮凝区G2值:)(25.558.7029.11060147.0100014-2sG3.第三段絮凝区:(1)第三段第一格水头损失H1第三段絮凝区采用平行直板布置,平均流速取0.11m/s,第三段第一格宽度为0.8m,第二格宽度0.6m,则第一格板间距b1:)(27.18.012.0122.0b1m,第一格直板数取3,共1个进口,3个转弯,则水头损失H1:)m(0088.081.9212.0)31(0.321H-6-(2)第三段第二格水头损失H2第二格板间距b2:)(69.16.012.0122.0b2m直板数取2,共1个进口,2个转弯,则水头损失H2:)m(0044.081.9212.0)21(0.222H(3)第三段总水头损失H=0.013m(4)第三段絮凝区停留时间T3:)min(38.55.437600.562.56.05.437600.562.58.03T(5)第三段絮凝区G3值:)(78.1938.5029.11060130.0100014-3sG各絮凝段主要指标絮凝段絮凝时间(min)水头损失(m)G(s-1)GT值第一段4.940.29398.012.9×104第二段7.80.14755.252.6×104第三段5.380.01319.786.4×103合计18.120.45357.682.0×104

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