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1、簡(jiǎn)要說(shuō)明粉粉塵處理理設(shè)備爆爆破破片片面面積計(jì)算算程程序序程程序序功功能能設(shè)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)備驗(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的粉塵輸入入必必輸項(xiàng),選填填項(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 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)

2、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設(shè)備容積m30.1-10000Pmax5-12Kstbar m/s10-200PredBar0.1-2PstatBar0.1-0.2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:zjmchezjmchePage 1INPUT 輸入入數(shù)數(shù)據(jù)據(jù)設(shè)備名名稱稱單元元號(hào)號(hào)備注注設(shè)備參參數(shù)數(shù)Vessel ID:容積Vol(m3)=10長(zhǎng)徑比L/D=2Existing Area=0.48 M2最大承壓Pred

3、(bar)=0.115防爆啟動(dòng)壓力Pstat(bar)=0.10粉粉塵性性質(zhì)備注注名名稱稱KSt,bar-m/sec80MIE=3-5 mJPmax(bar)7.6MIT,C=510RESULTS 計(jì)算算結(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100.00 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.

4、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=10V0.3=22Dist to Max PressRs=0.2Lf(horizontally)2 Vents*,Lf=6V0.3=13Pmax,bar=0.0320.47 p

5、si *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 2Effect of Vent DuctLength Ld=3Dd=0.7Ls=8.4Pred,max/Pred,max=1+17.3(A/V0.753)Ld/DdPred,max=reduced explosion pressure

6、with ductPred,max/Pred,max=5.01.NFPA 68,Guide for Venting of Deflagrations,2002 Edition,National Fire Prevention Association,1 Battery Park,P.O.Box 9101,Quincy,MA.02269-9109.2.Crowhurst,D.,Colwell,S.,Hoare,D.,Benselium,M.,Schramm,S.,Friehmelt,V.,Guidelines for Industry:DustExplosions-Flame and Pressure Effects Outside Vents,Dust Explosions,London,IBC,October 1995.Page 3