浮頂油罐的設(shè)計(jì)計(jì)算書(shū)p

1、PAGE PAGE 12伊拉克油罐計(jì)算書(shū)（中文）罐體參數(shù)：直徑d=76.25m 高h(yuǎn)=12.8m 其中一道抗封圈，三道加強(qiáng)圈。具體尺寸見(jiàn)附圖。二、油罐總用水量 Q=dh10.2L/min=3.14x76.25x12.8x10.2=31259.328L/min 因?yàn)椴扇∷母⒐?，所以取四分之一，q=31259.328/4=7814.832 L/min三、噴頭數(shù)的初步確定 根據(jù)噴水角度相切的原理，計(jì)算尺寸見(jiàn)下圖：由正弦定理得： = X=1.325 則每圈噴頭個(gè)數(shù)n=135.8，應(yīng)為136個(gè) 整個(gè)圓周分成四部分，只計(jì)算其中四分之一即可，噴頭個(gè)數(shù)為34個(gè)，如下圖：四、噴頭的流量，壓力計(jì)算 1、第一區(qū)：

2、高1.1m 面積S=1.1x3.14x76.25/4=65.84m2 此區(qū)域需流量Q=Sx10.2L/min m2=65.84x10.2=671.57 L/min=11.2L/s 每個(gè)噴頭的流量為q=671.57/34=19.8 L/min， 間距1.76m。 據(jù)此選水幕噴頭SMTBD-22-120，主要參數(shù)如下： 特性系數(shù)K=11.81.1 Q=222 L/min 霧化角=12010 接管螺紋1/2“ 由 公式q=K q噴頭流量（L/min） P噴頭工作壓力（MPa） K噴頭流量系數(shù)上圖節(jié)點(diǎn)1到18進(jìn)行水力計(jì)算，如表一。表一 頂環(huán)編號(hào)流量L/min壓力MPa管徑mm長(zhǎng)度m水力損失編號(hào)流量L/

3、min壓力MPa管徑mm長(zhǎng)度m水力損失1220.3510235.30.4411-2201.760.00410-11501.760.003244.220.35411260.20.4442-3201.760.01511-12501.760.004366.950.36912285.30.4483-4251.760.0112-13501.760.004490.00.37913310.50.4524-5251.760.01813-14501.760.0055113.60.39714335.80.4575-6321.760.00614-15501.760.0066137.40.40315361.30.46

4、36-7321.760.00915-16501.760.0077161.40.41216386.90.4707-8321.760.01216-17501.760.0088185.80.42417412.80.4788-9401.760.00717-18500.880.0049210.40.43118825.60.4829-10401.760.01總計(jì)825.60.48229.040.132總的損失=1.2x沿程損失=1.15x0.132=0.15182、第二區(qū)：高2.0m 面積S=2.0 x3.14x76.25/4=119.65m2 此區(qū)域需流量Q=Sx10.2L/min m2=119.65x

5、10.2=1220.27 L/min=20.34L/s 每個(gè)噴頭的流量為q=1220.27/34=35.9 L/min， 間距1.76m。 據(jù)此選水幕噴頭SMTBD-40-120，主要參數(shù)如下： 特性系數(shù)K=21.41.6 Q=403 L/min 霧化角=12010 接管螺紋3/4“ 由 公式q=K q噴頭流量（L/min） P噴頭工作壓力（MPa） K噴頭流量系數(shù)上圖節(jié)點(diǎn)1到18進(jìn)行水力計(jì)算，如表二。表二 二環(huán)編號(hào)流量L/min壓力MPa管徑mm長(zhǎng)度m水力損失編號(hào)流量L/min壓力MPa管徑mm長(zhǎng)度m水力損失1400.3510422.30.4491-2251.760.004V=1.3210-

6、11701.760.003V=2.00280.260.35411467.80.4522-3251.760.014V=2.5411-12701.760.003V=2.213121.30.36812513.450.4553-4251.760.031V=3.8112-13701.760.004V=2.414164.050.39913559.30.4594-5321.760.013V=2.8713-14701.760.005V=2.645207.490.41214605.40.4645-6321.760.02V=3.6314-15701.760.005V=2.846247.800.43215651.7

7、40.4696-7501.760.004V=2.0215-16701.760.006V=3.047290.380.43616698.40.4757-8501.760.005V=2.3116-17701.760.007V=3.258333.500.44117745.20.4828-9501.760.006V=2.6417-18700.880.004V=3.479376.940.447181490.40.4869-10701.760.002V=1.78總計(jì)1490.40.48629.040.136總的損失=1.2x沿程損失=1.2x0.136=0.16323、第三區(qū)與第二區(qū)基本相同，只進(jìn)行流量與壓

8、力的校核。見(jiàn)表三表三 三環(huán)編號(hào)流量L/min壓力MPa管徑mm長(zhǎng)度m水力損失編號(hào)流量L/min壓力MPa管徑mm長(zhǎng)度m水力損失1400.3510420.80.4551-2251.760.004V=1.3210-11501.760.01V=3.30280.260.35411466.90.4652-3251.760.014V=2.5411-12701.760.003V=2.213121.30.36812513.20.4683-4251.760.031V=3.8112-13701.760.004V=2.414164.050.39913560.50.4724-5321.760.013V=2.8713-

9、14701.760.005V=2.645207.490.41214607.70.4775-6321.760.02V=3.6314-15701.760.005V=2.846247.800.43215655.10.4826-7501.760.004V=2.0215-16701.760.006V=3.047290.380.43616702.80.4887-8501.760.005V=2.3116-17701.760.007V=3.258333.500.44117750.80.4958-9501.760.006V=2.6417-18700.880.004V=3.479376.940.447181501

10、.60.4999-10501.760.008V=2.97總計(jì)1501.60.49929.040.149總的損失=1.2x沿程損失=1.2x0.149=0.17884、第四區(qū)：高7.7m 面積S=7.7x3.14x76.25/4=461.0m2 此區(qū)域需流量Q=Sx10.2L/min m2=461x10.2=4701.1 L/min=78.35L/s 由于流量比較大，所以噴頭相應(yīng)增加為48個(gè)。 每個(gè)噴頭的流量為q=4701.1/48=98.0L/min， 間距1.25m。 據(jù)此選水幕噴頭SMTBD-100-120，主要參數(shù)如下： 特性系數(shù)K=53.53.2 Q=1005 L/min 霧化角=12

11、010 接管螺紋3/4“ 由 公式q=K q噴頭流量（L/min） P噴頭工作壓力（MPa） K噴頭流量系數(shù)下圖節(jié)點(diǎn)1到25進(jìn)行水力計(jì)算，如表四。表四 四環(huán)編號(hào)流量L/min壓力MPa管徑mm長(zhǎng)度m水力損失編號(hào)流量L/min壓力MPa管徑mm長(zhǎng)度m水力損失11000.35131372.20.4281-2321.250.003V=1.7613-14801.250.008V=4.62200.50.353141484.00.4362-3321.250.013V=3.5214-151001.250.002V=2.863302.850.366151596.00.4383-4501.250.004V=2.

12、3515-161001.250.003V=3.14405.760.370161708.40.4414-5501.250.007V=3.1816-171001.250.003V=3.35509.640.377171821.10.4445-6501.250.01V=4.017-181001.250.003V=3.56614.880.387181934.20.4476-7701.250.003V=2.9018-191001.250.004V=3.727720.530.390192047.80.4517-8701.250.006V=3.4019-201001.250.004V=3.838827.00.

13、396202162.00.4558-9701.250.007V=3.9020-211001.250.004V=4.19934.40.403212276.60.4599-10701.250.008V=4.4121-221001.250.005V=4.38101042.70.410222391.80.46410-11801.250.005V=3.5022-231001.250.006V=4.6111151.70.415232507.80.47010-12801.250.006V=3.8723-241001.250.006V=4.83121261.50.421242624.50.47612-1380

14、1.250.007V=4.2324-251000.630.003V=5.0255249.00.479總計(jì)5249.00.47929.380.129總的損失=1.3x沿程損失=1.3x0.129=0.1677由表一表四得：四分之一油罐所需總流量Q=(5249+1501.6+1490.4+825.6)x1.15=10426.6L/min=173.78L/s則L=12.8m, 選DN250鋼管，水力損失=0.013 MPa 流速v=3.48m/s四分之一油罐所需總水壓P=0.35+0.1518+0.128+0.013=0.643MPa五、立管尺寸的確定 根據(jù)以上數(shù)據(jù)， 第一環(huán)至二環(huán)段 流量q=825

15、.6L/min=13.76l/s 管徑為DN80 流速v=2.77l/s 第二環(huán)至四環(huán)段 流量q=3817.6L/min=63.63l/s 管徑為DN150 流速v=3.75l/s 四環(huán)以下 流量q=9066.6L/min=151.1l/s 管徑為DN250 流速v=3.10l/s以上為冷卻水噴淋計(jì)算。油罐泡沫消防部分計(jì)算：根據(jù)NFPA11罐壁到泡沫擋板距離d=600mm泡沫液供給強(qiáng)度 12.2L/minm2 供給時(shí)間 20min二、大罐密封圈環(huán)型面積s=罐頂總表面積-不需要保護(hù)的面積 =R2-r2=（R2- r2）=3.14x(38.132-37.632) =118.94m2 所需總炮沫量=

16、s泡沫供給強(qiáng)度=118.94x12.2=1451.1L/min=24.2l/s 泡沫濃縮液的量（6%）=1451.1x20 x6%=1741.32L三、根據(jù)油罐的圓周確定泡沫噴射口的設(shè)置數(shù)量 1 泡沫擋板使用高305mm時(shí)，泡沫噴射口在油罐圓周上的最大間距為12.2m；2 泡沫擋板使用高610mm時(shí)，泡沫噴射口在油罐圓周上的最大間距為24.4m；本次設(shè)計(jì)擋板高于610mm，所以間距宜取24.4m油罐圓周長(zhǎng)度=d=3.14x76.25=239.425m 噴射口數(shù)量=239.425/24.4=9.8125 取為10個(gè)泡沫系統(tǒng)簡(jiǎn)圖，如下所示： 四、管道水力計(jì)算一流量：每個(gè)噴射口所需要泡沫量=所需總泡

17、沫量/10=24.2/10=2.42l/s二壓力：空氣泡沫產(chǎn)生器選PC4，選用DN50的焊接鋼管，具體參數(shù)如下：進(jìn)口壓力0.5MPa混合液流量4L/s發(fā)泡倍數(shù)=6特性系數(shù)K=5.75 流速v=1.88m/s 沿程水頭損失=0.001772MPa（m） 局部水頭損失=0.000532 MPa（m） 總水頭損失= 0.002304 MPa（m） 管長(zhǎng)L=14m，則總管線的水頭損失=14x0.002304=0.0322MPa 得 H=h+h0+hz=0.0322+0.5+0.13=0.6622 MPa H油罐底部管線進(jìn)口壓力（MPa） h系統(tǒng)管道的沿程壓力損失與局部壓力損失之和（MPa） h0最不利

18、點(diǎn)處泡沫產(chǎn)生器裝置的工作壓力（MPa）hz最不利點(diǎn)處泡沫產(chǎn)生裝置與管道進(jìn)口的靜壓差（MPa）CALCULATION SHEET OF ONE OIL TANK（英文）Cooling water system1、Tank Parameter：Diameter=76.25m High=12.8m2、Water quantity Q=dh10.2L/min=3.14x76.25x12.8x10.2=31259.328L/min Total four stand pipe, each stand pipe=31259.328/4=7814.832 L/min3、Nozzle quantity = X=

19、1.325 Nozzle quantity of each ring =135.8，應(yīng)為136個(gè) 4、Nozzle Flux and pressure 1) First area：H=1.1m S=1.1x3.14x76.25/4=65.84m2 Q=Sx10.2L/min m2=65.84x10.2=671.57 L/min=11.2L/s Flux of each nozzle =671.57/34=19.8 L/min. Checkout by computer: Quantity of nozzle 172 should be instead of 136. Space between

20、:1.39m。Lost pressure=1.15x0.132=0.1518The nominal diameter of ring pipe 1 is 50mm in according to flux、velocity of flow.Second area and third area：H=2.0m S=2.0 x3.14x76.25/4=119.65m2 Q=Sx10.2L/min m2=119.65x10.2=1220.27 L/min=20.34L/s Flux of each nozzle =1220.27/34=35.9 L/min Checkout by computer:

21、Quantity of nozzle are 136. Space between:1.76m。Lost pressure=1.2x0.136=0.1632The nominal diameter of ring pipe 2 and 3 is 65mm in according to flux、velocity of flow. 3) fourth area: H=7.7mS=7.7x3.14x76.25/4=461.0m2 Q=Sx10.2L/min m2=461x10.2=4701.1 L/min=78.35L/s Flux of each nozzle =4701.1/48=97.9

22、L/minCheckout by computer: Quantity of nozzle 192 should be instead of 136. Space between:1.25m。Lost pressure=1.3x0.129=0.1677The nominal diameter of ring pipe 4 is 100mm in according to flux、velocity of flow.4) Flux of One fourth oil tank=(5249+1501.6+1490.4+825.6)x1.15=10426.6L/min=173.78L/sThe nominal diameter of stand pipe is 250mm in according to flux、velocity of flow.Lost pressure =0