某供水工程水力报告

供水工程水力分析一．工程概况：1.1水泵三用一备，大泵2台（一用一备）单台流量=2708立方/小时，小泵二用，单台流量=1354立方/小时，考虑到远期供水规模，故总流量=6770立方/小时=1880.56L/S,管线长：2916M，管径：DN1400*12---钢管，海参-威廉系数C=125,水锤波速A=1031.6M/S;下游J4节点开始DN1400*14玻璃钢管C＝150，水锤波速A≈200M/S。1.2起始点标高R1--283.4米，并假设1m的水池吸水水位，最高节点PQ3-高程361.42米（4512米处），末端标高R2—593.53米，并假设1m的水池淹没水位。（稳态分析时按2m计算了，但不影响水锤分析按1m计算）。二．稳态水力分析2.1此工况在主管管径：DN1400*12---钢管，海参-威廉系数C=125;下游J4节点开始DN1400*14玻璃钢管C＝150，其稳态水力分析数据及图表见后面，水力坡度线如图1所示。三．瞬态水力分析3.1水锤波速：a=1031.6m/s—1863m＋200m/s-(4660-3623.78+17=1053.22m),水锤相：μ＝1863×2/1031.6+1053.22*2/200=14.14S;3.2止回阀关阀方案1：2S快闭70％＋18S缓闭30％，水击升压约77米，总压力约155米，不好！（见图2）3.3止回阀关阀方案2：2S快闭80％＋18S缓闭20％，水击升压约50米，总压力约128米，较好。（见图2）3.4止回阀关阀方案4：2S快闭85％＋18S缓闭15％，水击升压约43米，总压力约121米，最好！（见图3），图4为此条件下的包络线图。3.5图5为最高节点PQ3(高程361.42米)水击压力历时曲线，可以看出此点有断流弥合水锤产生，加装GA-992DN300注气微排阀可解决（见图6）3.6这是最理想的关阀方案，但水泵控制阀或止回阀并不一定能做到每次都成功按设定方案关阀，应考虑关阀失败的可能性，因此，系统仍需要安装水锤防护后保护设备如水击泄放阀。建议采用GAFIG.6600-UDN250×1台+DN200×2台，2.76Mpa，设定压力分别为Pset1=94mH2O、Pset2=92mH2O和Pset3=90mH2O，选用三个较小口径水击阀比一个大口径好：此工况对三个水击阀来说，水击高压泄水压力分别设定为90米、92米、94米；因为总的泄水能力是为最大水锤设计的，而每次水击并不都达到最大值（泵系统为三用一备）。这样，对较小的水击来说，开启一个或两个较小口径的水击阀就够了，而另一个水击泄放阀则作为备用保护；如果水击压力继续增高超过92米，则备用的水击泄放阀将在此时自动开启泄水。这样的安排，对系统的扰动较小，适应性、稳定性最好。安装这3台水击泄放阀后止回阀节点处的水击压力历时曲线如图7红色线所示。3.7安装3台水击泄放阀后的水击包络线如图8所示，最大水击压力出现在末端阀门前。3.8假设采用3S快闭100％方案，停泵水锤很严重，见图9。即使如此，上述3台水击泄放阀也能成功消除这些水锤，见图10~13。四．空气阀设计方案4.1微量排气阀：3/16”=4.76mm孔口，GAFIG.920型DN50；但为了加快真空吸气后的微量排气速度，建议采用FIG.922型3/8”孔口的DN50微量排气阀；4.2高速排气孔口：DN80,GAFIG.930型；4.3高速吸气孔口：DN100~300,GAFIG.990型-请注意，吸气口径越大，微量排气孔口也要加大-如GAFIG.923型DN100-1/2”孔口。不然，大量吸气后微量排气太慢，影响管线恢复通水时间和通水能力。4.4无负压的点上只需安装复合式空气阀就可以，建议GAFIG.945型DN80,配套的微量孔口3/16”=4.76mm。见图11和12。4.5沿线空气阀布置原则上每隔400～800m-（美国AWWAM51建议值）设置一处，最好设在局部最高点。4.6以上方案可以既可以解决空气阀问题，同时也解决了负压水锤问题。PUMP/LOSSELEMENTRESULTS稳态水力分析－水泵参数INLETOUTLETPUMPEFFIC-USEFULINCREMTLTOTAL#PUMPS#PUMPSNPSHNAMEFLOWRATEHEADHEADHEADENCYPOWERCOSTCOSTPARALLELSERIESAvail.(l/s)(m)(m)(m)(%)(kW)($)($)(m)--------------------------------------------------------------------------------------------------------Pump-1940.011.9982.1880.2----------------****11.9Pump-2470.151.9981.1579.2----------------****12.0Pump-3470.261.9981.1379.1----------------****12.0PIPELINERESULTS稳态水力分析－管段数据考虑了任意假设的局部损失后，没采用末端调节阀,流量大约1880.42L/S=6770M3/H—很接近工况状态PIPELINERESULTSSTATUSCODE:XX-CLOSEDPIPECV-CHECKVALVEPIPENODENUMBERSFLOWRATEHEADMINORLINEHL+ML/HL/NAME#1#2LOSSLOSSVELO.10001000(l/s)(m)(m)(m/s)(m/m)(m/m)-----------------------------------------------------------------------------------------P-1R-1I-Pump-1940.010.010.001.873.703.70P-2O-Pump-1I-AV-1940.010.010.582.44296.047.08P-3O-AV-1J-0940.010.010.632.44321.897.08P-4J1-1J1-21880.420.020.001.240.900.90P-5J1-2J1-31880.420.020.001.240.900.90P-6J1-3J11880.420.000.001.240.900.90P-7J1X11880.420.010.001.240.900.90P-8X1X31880.420.170.001.240.900.90P-9X3X71880.420.430.001.240.900.90P-10X7X10-11880.420.400.001.240.900.90P-11X10-1X14-51880.420.410.001.240.900.90P-12X14-5PQ011880.420.140.061.241.290.90P-13PQ01J41880.420.030.061.242.670.90P-14DN800分支管FJ8X16-10.000.000.000.000.000.00P-15J4J4-51880.420.000.031.245.090.64P-16J4-5J51880.420.010.031.243.470.64P-17J5X171880.420.030.121.243.320.64P-18X17PQ31880.420.530.151.240.820.64P-19PQ3R-21880.420.200.301.663.371.32P-20R-1I-Pump-2470.150.010.001.664.164.16P-21R-1I-Pump-3470.260.010.001.664.164.16P-22J-0J1-11880.420.030.001.240.900.90P-23O-Pump-2I-AV-2470.150.020.392.39203.0310.10P-24O-Pump-3I-AV-3470.260.400.001.663.873.87P-25O-AV-2J-20470.150.020.002.3910.1010.10P-26O-AV-3J-3470.260.000.000.941.021.02P-27J-20J-0940.410.010.001.873.703.70P-28J-3J-20470.260.000.000.941.021.02P-29J4FJ80.000.000.000.000.000.00~@AV-1I-AV-1O-AV-1940.010.000.520.13********0.01~@AV-2I-AV-2O-AV-2470.150.000.290.07********0.00~@AV-3I-AV-3O-AV-3470.260.000.290.07********0.00ENDNODERESULTS稳态水力分析－节点数据节点名称节点流量总水头米节点高程米净水头米节点压力kPaNODENODEEXTERNALHYDRAULICNODEPRESSURENODENAMETITLEDEMANDGRADEELEVATIONHEADPRESSURE(l/s)(m)(m)(m)(kpa)------------------------------------------------------------------------------FJ80.00362.93347.6015.33150.37J10.00364.65286.0978.56770.41J40.00362.93347.6015.33150.37J50.00362.86347.6015.26149.65PQ010.00363.02347.6015.42151.24PQ3最高节点0.00362.03361.420.615.97X10.00364.64286.6278.02765.09X170.00362.71348.8313.88136.12X30.00364.47293.8070.67693.02X70.00364.03295.1868.85675.23O-AV-10.00365.37284.3081.07795.02O-AV-20.00364.75284.3080.45788.97O-AV-30.00364.74284.3080.44788.83J-30.00364.74284.3080.44788.81J-200.00364.73284.3080.43788.78J-00.00364.72284.3080.42788.70J1-10.00364.69284.3080.39788.37J1-20.00364.67285.1379.54780.04J1-30.00364.65285.9378.72772.01J4-50.00362.90347.6015.30150.02O-Pump-10.00366.48284.3082.18805.91O-Pump-20.00365.45284.3081.15795.82O-Pump-30.00365.43284.3081.13795.64R-1吸水水池----286.30284.302.0019.61R-2出水水池----361.53359.532.0019.61X10-10.00363.63321.9741.66408.54X14-50.00363.22343.0920.13197.37X16-10.00362.93347.0315.90155.96I-Pump-10.00286.29284.301.9919.54I-AV-1水泵控制阀0.00365.89284.3081.59800.11I-Pump-20.00286.29284.301.9919.53I-Pump-30.00286.29284.301.9919.53I-AV-20.00365.04284.3080.74791.84I-AV-3