天然氣調(diào)壓站詳細(xì)計(jì)算表,,,,,,,,,

,,,,,,,,,,

序號,計(jì)算項(xiàng)目,符號表示,參數(shù)來源,計(jì)算公式,國際單位,計(jì)算結(jié)果,參數(shù)說明,規(guī)范依據(jù),其他說明

一、基礎(chǔ)參數(shù),,,,,,,,,

1,天然氣相對密度,S,設(shè)計(jì)值,,,0.60,天然氣與空氣密度比值,GB50028-2006,甲烷含量95%

2,標(biāo)準(zhǔn)狀態(tài)天然氣密度,ρ?,查表值,,kg/m3,0.717,"20℃,101.325kPa下密度",天然氣物性手冊,

3,絕熱指數(shù),k,查表值,,,1.30,天然氣等熵指數(shù),工程熱力學(xué),

4,氣體常數(shù),R,查表值,,J/(kg·K),518.3,天然氣氣體常數(shù),工程熱力學(xué),

5,設(shè)計(jì)溫度,T,設(shè)計(jì)值,,K,293.15,調(diào)壓站工作溫度,GB50028-2006,20℃

二、調(diào)壓器計(jì)算,,,,,,,,,

6,進(jìn)口絕對壓力,P?,設(shè)計(jì)值,,MPa,0.5013,調(diào)壓器入口壓力,工藝要求,表壓0.4MPa

7,出口絕對壓力,P?,設(shè)計(jì)值,,MPa,0.2013,調(diào)壓器出口壓力,工藝要求,表壓0.1MPa

8,壓力比,P?/P?,計(jì)算值,P?/P?,,0.4016,出口與進(jìn)口壓力比,流體力學(xué),

9,臨界壓力比,νc,計(jì)算值,(2/(k+1))^(k/(k-1)),,0.5457,氣體臨界壓力比,氣體動(dòng)力學(xué),k=1.3

10,流動(dòng)狀態(tài)判斷,,判斷值,P?/P?≤νc,,臨界流動(dòng),判斷流動(dòng)狀態(tài),流體力學(xué),滿足臨界條件

11,設(shè)計(jì)流量,Q,設(shè)計(jì)值,,m3/h,5000,調(diào)壓器設(shè)計(jì)流量,工藝要求,標(biāo)準(zhǔn)狀態(tài)

12,計(jì)算流量,Qc,計(jì)算值,1.2×Q,m3/h,6000,考慮安全系數(shù),GB50028-2006,安全系數(shù)1.2

13,流量系數(shù),C,計(jì)算值,Qc×√(T?×S)/(526×P?),,128.5,調(diào)壓器流通能力,調(diào)壓器設(shè)計(jì)手冊,

14,閥口面積,A?,計(jì)算值,C/(5.04×√(ΔP/ρ)),cm2,85.6,調(diào)壓器閥口面積,流體力學(xué),

三、管道水力計(jì)算,,,,,,,,,

15,管道長度,L,設(shè)計(jì)值,,m,50,進(jìn)口管道長度,布置要求,

16,管道內(nèi)徑,D,選用值,,mm,150,進(jìn)口管道直徑,水力計(jì)算,DN150

17,管道粗糙度,ε,選用值,,mm,0.02,鋼管內(nèi)壁粗糙度,管道設(shè)計(jì)手冊,新鋼管

18,氣體流速,v,計(jì)算值,4Q/(πD2×3600),m/s,12.8,管道內(nèi)氣體流速,流體力學(xué),

19,雷諾數(shù),Re,計(jì)算值,ρvD/μ,,1.8×10?,流動(dòng)雷諾數(shù),流體力學(xué),湍流

20,摩擦系數(shù),λ,計(jì)算值,0.018,,0.018,達(dá)西摩擦系數(shù),莫迪圖,

21,沿程壓力損失,ΔP?,計(jì)算值,λ(L/D)(ρv2/2),Pa,1250,管道沿程損失,達(dá)西公式,

22,局部阻力系數(shù),ξ,選用值,,,2.5,管件局部阻力,管件手冊,閥門+彎頭

23,局部壓力損失,ΔP?,計(jì)算值,ξ(ρv2/2),Pa,312,管件局部損失,局部阻力公式,

24,總壓力損失,ΔP,計(jì)算值,ΔP?+ΔP?,Pa,1562,管道總損失,,

四、設(shè)備選型計(jì)算,,,,,,,,,

25,過濾器精度,,選用值,,μm,100,燃?xì)膺^濾精度,GB50028-2006,

26,過濾器壓力損失,ΔPf,選用值,,kPa,5,過濾器阻力損失,產(chǎn)品樣本,

27,安全閥設(shè)定壓力,Pset,計(jì)算值,1.1×P?,MPa,0.221,安全放散壓力,GB50028-2006,1.1倍工作壓力

28,安全閥排量,Qsa,計(jì)算值,0.04×A×Pset×√(M/T),kg/s,0.85,安全閥泄放量,API520,

29,壓力表量程,,選用值,,MPa,0-1.0,進(jìn)口壓力表,儀表選型,1.5倍工作壓力

30,壓力表精度,,選用值,,,1.6級,壓力表精度等級,GB/T1226-2010,

五、安全距離計(jì)算,,,,,,,,,

31,調(diào)壓站類型,,選用值,,,地上調(diào)壓柜,調(diào)壓裝置類型,GB50028-2006,

32,進(jìn)口壓力等級,,判斷值,,,中壓A,壓力等級分類,GB50028-2006,0.2<P≤0.4MPa

33,與住宅安全距離,,查表值,,m,4.0,水平安全距離,GB50028-2006表6.6.3,

34,與重要公共建筑距離,,查表值,,m,8.0,水平安全距離,GB50028-2006表6.6.3,

35,與道路安全距離,,查表值,,m,2.0,水平安全距離,GB50028-2006表6.6.3,

36,防火堤高度,,計(jì)算值,,m,1.0,防護(hù)設(shè)施高度,GB50028-2006,

六、防爆等級計(jì)算,,,,,,,,,

37,危險(xiǎn)區(qū)域劃分,,判斷值,,,1區(qū),爆炸性氣體環(huán)境,GB50058-2014,

38,溫度組別,,判斷值,,,T4,設(shè)備溫度等級,GB3836-2010,≤135℃

39,防爆等級,,確定值,,,ExdⅡBT4,電氣設(shè)備防爆等級,GB3836-2010,

40,防護(hù)等級,,選用值,,,IP65,設(shè)備防護(hù)等級,GB4208-2017,

七、管道強(qiáng)度計(jì)算,,,,,,,,,

41,設(shè)計(jì)壓力,P,設(shè)計(jì)值,,MPa,0.4,管道設(shè)計(jì)壓力,GB50316-2000,

42,許用應(yīng)力,[σ],查表值,,MPa,113,管材許用應(yīng)力,GB50316-2000,20#鋼

43,焊縫系數(shù),φ,選用值,,,0.8,焊接接頭系數(shù),GB50316-2000,

44,壁厚附加量,C,計(jì)算值,,mm,2.0,腐蝕+制造偏差,管道設(shè)計(jì)手冊,

45,計(jì)算壁厚,δc,計(jì)算值,PD/(2[σ]φ),mm,2.21,理論計(jì)算壁厚,第三強(qiáng)度理論,

46,選用壁厚,δ,選用值,,mm,4.5,實(shí)際管道壁厚,鋼管標(biāo)準(zhǔn),DN150×4.5

47,壁厚校核,,判斷值,δ≥δc+C,,滿足,強(qiáng)度校核結(jié)果,GB50316-2000,

八、計(jì)算結(jié)論,,,,,,,,,

48,調(diào)壓器選型,,結(jié)論,,,滿足要求,流量和壓力滿足,計(jì)算結(jié)果,

49,管道設(shè)計(jì),,結(jié)論,,,滿足