爆破片面積計(jì)算

1、簡(jiǎn)要說(shuō)明Page 1粉粉塵塵處處理理設(shè)設(shè)備備爆爆破破片片面面積積計(jì)計(jì)算算程程序序程程序序功功能能設(shè)設(shè)計(jì)計(jì): : 計(jì)算處理可燃性粉塵設(shè)備泄爆口的面積,以及一旦發(fā)生粉塵爆炸后對(duì)外部的影響如火球大小及爆炸壓力影響區(qū)域, 為設(shè)備布置提供參考已已有有設(shè)設(shè)備備驗(yàn)驗(yàn)算算當(dāng)已有設(shè)備改變用途,處理不同性質(zhì)的粉塵時(shí), 可求出設(shè)備能處理的最大Kst的粉塵輸輸入入必必輸輸項(xiàng)項(xiàng), , 選選填填項(xiàng)項(xiàng)1 設(shè)備參數(shù)1.1 Vm3設(shè)備容積1.2 L/D長(zhǎng)徑比1.3 PredBar設(shè)備能承受的壓力, 通常為設(shè)計(jì)壓力1.4 PstatBar泄爆裝置的啟動(dòng)壓力1.5 EAm2泄爆口方向出口面積(如設(shè)備在室外,可取整個(gè)設(shè)備的截面積)2

2、 粉塵參數(shù)2.1 KstBar m/s粉塵爆燃因子, 通過(guò)實(shí)驗(yàn)測(cè)得, 一般粉塵手冊(cè)中可查得, 100為高度危險(xiǎn)的粉塵2.2 PmaxBar粉塵爆炸后能形成的最高壓力2.3 MITC著火溫度2.4 MIEMJ最小引火能量適適用用范范圍圍設(shè)備容積m30.1-10000Pmax5-12Kstbar m/s10-200PredBar0.1-2PstatBar0.1-0.2計(jì)計(jì)算算依依據(jù)據(jù)NFPA68技技術(shù)術(shù)支支持持此程序由zjmche 改編技術(shù)答疑請(qǐng)聯(lián)系:Page 2INPUTINPUT 輸輸入入數(shù)數(shù)據(jù)據(jù)設(shè)設(shè)備備名名稱稱單單元元號(hào)號(hào)備備注注設(shè)設(shè)備備參參數(shù)數(shù)Vessel ID: 容積Vol (m3)=1

3、0長(zhǎng)徑比L/D=2Existing Area =0.48 M2最大承壓Pred (bar)=0.115 防爆啟動(dòng)壓力Pstat (bar)=0.10粉粉塵塵性性質(zhì)質(zhì)備備注注名名稱稱KSt, bar-m/sec80MIE = 3-5 mJPmax(bar)7.6MIT, C = 510RESULTSRESULTS 計(jì)計(jì)算算結(jié)結(jié)果果所需泄爆面積Vent Area (M2) =0.36m2External Effects噴射火焰長(zhǎng)度Flame Jet Length:1 Vent單個(gè)泄放口21.53m2 Vents*2個(gè)泄放口12.92m燃爆火球大小FireBallFireball Vol火球體積10

4、0.00 m3Fireball Width火球?qū)挾?.63m外部形成的最大爆炸壓力Pmax, External外部最大壓力0.03barDistance to Pmax最大壓力區(qū)4.31mVent Size Equation - NFPA 2002 for L/D 2DA = 1.56 Av1/Pred - 1/Pmax0.65log(L/D - 1)DA = 0.00m2Atotal =0.36m2EXTERNAL EFFECTSFlame Jet Length, MMax. Ext. Press.Pmax = 0.2Pred (A0.1)( V0.18)1 Vent, Lf = 10V0.

5、3 = 22Dist to Max Press Rs = 0.2Lf (horizontally)2 Vents*, Lf=6V0.3 =13Pmax, bar = 0.0320.47 psi *well separated ventsRs (m) =4.3 (1 Vent)Fireball SizeVf = 10VPr = Pmaxa(Rs/ r)r (m) Pr (bar)psigFireball Vol = 100 m37.30.0190.28Fireball Width = 5 m10.30.0140.2013.30.0100.1516.30.0090.12Page 3Effect o

6、f Vent DuctLength Ld =3Dd =0.7Ls =8.4Pred,max/Pred,max = 1 + 17.3(A/V0.753) Ld/DdPred,max = reduced explosion pressure with ductPred,max/Pred,max =5.01. NFPA 68, Guide for Venting of Deflagrations, 2002 Edition, National Fire Prevention Association, 1 BatteryPark, P.O. Box 9101, Quincy, MA. 02269-9109.2. Crowhurst, D., Colwell, S., Hoare, D., Benselium, M., Schramm, S., Friehmelt, V., Guidelines for Industry: Du