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1、斗式提升機(jī)的泄爆排氣摘要Thispaperisareportofanexperimentalprogrammeontheexplosionprotectionofbucketelevatorsbyventing.TheprojectwasacollaborativeeffortwithfundingbytheHealthandSafetyExecutiveandmanufacturersandusersofbucketelevatorsthroughtheBritishMaterialsHandlingBoard.Twobucketelevatorswereusedintheprojec
2、t—asinglelegelevatorandatwin-legelevator.FourdustswereusedwithKStvaluesupto211barms?1anddustcloudswereproducedbydustinjectionandbynormaloperation.Reducedexplosionpressuresweremeasuredandguidancehasbeenderivedfromtheresults.ThisguidanceisintermsofventspacingasafunctionoftheKStvalueofthedust.本文介紹附在
3、斗式提升機(jī)上的防爆裝置的泄爆實(shí)驗(yàn)。該項(xiàng)目是由衛(wèi)生安全部門(mén)以及制造商和用戶委托英國(guó)材料處理部門(mén)執(zhí)行。兩斗式提升機(jī)中使用了一個(gè)單腿電梯和一雙腿電梯。測(cè)量了爆炸壓力和已經(jīng)衍生出的結(jié)果。本指南是根據(jù)排氣間距為塵埃中的值函數(shù)。Keywords關(guān)鍵詞：粉塵爆炸；發(fā)泄；斗式提升機(jī)Bucketelevatorsarewidelyusedinthehandlingoflargequantitiesofbulkpowdersandarenormallythepreferredmeansofconveyingwherelongverticalliftsarerequiredforfreeflowingpowd
4、ers/granularproducts.Assuchtheyaretobefoundinnearlyallanimalfeedmills,bulkgrainstoresandmanyofthelargerinstallationshandlingpowdersinthefoodindustry.Powderorgranularproductsinevitablyspillfromthebucketsduringoperationandfalldowntheuplegoftheelevator.Thefinermaterialislikelytoremaininsuspensionwhi
5、lethecoarsermaterialfallsbacktotheboot.Atthetopoftheelevatormostofthepowderwilldischargedowntheoff-takechute,butsomewillnormallybecarriedoverintothedownlegoftheelevator.Thusbothlegsarelikelytocontainadustcloudofunknownconcentration,constantlyagitatedbythemovingbuckets,allthetimetheelevatorisinope
6、ration.Varioussourcesofignitionareforeseeableinsuchunitsandexplosionincidentshavebeenreported.斗式提升機(jī)廣泛應(yīng)用于處理大批量散裝粉末，是自由流動(dòng)的粉末或顆粒長(zhǎng)距離垂直輸送優(yōu)先選擇。正是因?yàn)檫@樣他們可以在幾乎所有的動(dòng)物飼料以及散裝谷物的商店和許多大型設(shè)備在食品工業(yè)中用于處理粉末。粉末或顆粒狀產(chǎn)品在操作中不可避免地溢出。較細(xì)的物料可能會(huì)保持在懸浮液中而較粗的物料落回地面。在斗提機(jī)頂部的大多數(shù)粉末會(huì)從出料口流出，但有一些粉末通常會(huì)被帶到斗提機(jī)的下部。因此，在斗提機(jī)運(yùn)行的整個(gè)過(guò)程中兩條輸送帶可能含有未知
7、濃度的粉塵云，不斷的被攪動(dòng)著。各種可預(yù)見(jiàn)的火災(zāi)和爆炸事件紛紛報(bào)道出來(lái)。Explosionventingisonemethodforexplosionprotectionofbucketelevators.ThecurrentInstitutionofChemicalEngineersguidancerequiresthatthevents—equalincrosssectionalareatothelimb—arepositione
