Sizifundo kwiTezemidlaloPiimpahla zePodaEjector esekelweDulungileVenturiEisiphumo

I-venturi ejector inokwenza imimandla ye-vacuum ukuthutha amaqhekeza ngenxa yesiphumo se-venturi. Ukusebenza kothutho lwe-powder ejectors esekelwe kwisiphumo esisodwa kunye ne-double-venturi kunye nefuthe lendawo yomlomo we-nozzle ekusebenzeni kothutho lwaphandwa ngokulandelelana ngendlela yovavanyo kunye nokulinganisa kwamanani okusekwe kwindlela yokudibanisa i-CFD-DEM. Iziphumo zangoku zibonisa iisantya somoyaye-particle inlet ukwanda ngenxa yesiphumo kabini-venturi, nto leyo enenzuzo amasuntswana kwiisitofu; amandla okuqhuba asebenzisa amasuntswana ngokunyuka kwamanzi, okuthetha ukuba amasuntswana angathuthwa asiwe kumgama omde; ukusondela komlomo kuthunyelo kumazwe angaphandle, kokukhona inkulu iisantya somoyai-particle inlet inlet kwaye kokukhona amandla okufunxa amakhulu asebenza kumasuntswana; ukusondela umlomo kuthunyelo kumazwe angaphandle, kokukhona inani lokubekwa kwamasuntswana kwiisitofuyi; nangona kunjalo, amasuntswana angathintelwa kwityhubhu ye-venturi ukuba umlomo usondele kakhulu ekuthumeleni ngaphandle. Ukongeza, ukuze kuncitshiswe i-particle deposition, isisombululo esona sisona sinikeziwe apha, oko kukuthi, indawo ye-nozzle kude nokuthunyelwa ngaphandle,y∗ = 30 mm.

Intshayelelo

Itekhnoloji yokuhambisa i-pneumatic ineenzuzo ezininzi, ezifana noyilo oluguquguqukayo, akukho ngcoliseko lothuli, iindleko eziphantsi zokusebenza kunye nokugcinwa okulula. Ke, itekhnoloji yokuhambisa i-pneumatic isetyenziswa ngokubanzi kwi-petroleum, ikhemikhali, i-metallurgical, i-pharmaceutical, ukutya kunye namashishini okulungisa izimbiwa. I-Venturi powder ejector yi-gas-solid enye esekelwe kwimpembelelo ye-venturi. Ezinye izifundo zovavanyo kunye namanani kwi-venturi injector zenziwe kwishumi leminyaka edlulileyo ukuze kuqondwe iimpawu zothutho lwayo.

Umphandiiqhube izifundo zovavanyo kunye namanani kwi-jet tube esekelwe kwi-venturi kwaye yahlalutya ubudlelwane phakathi kweeparitha ezahlukeneyo kunye neendlela zokuvavanya kunye namanani.Umphandi kuqhutywe uchungechunge lophando lovavanyo lwesigaba esisodwa segesi kunye negesi-amalahle umxube ohamba nge-venturi, kwaye wabonisa ukuba ukuncipha okubukhali kuxinzelelo lwe-static kunye nomlinganiselo wokulayisha umthamo wabonwa ngaphakathi kwe-venturi.Umphandikuqhutywe uphononongo lokubala malunga nokuziphatha kokuhamba kwe-gas-solid injector ngendlela ye-Eulerian, ebonisa ukuba ixesha eliphakathi kwe-axial particle velocity liyenyuka kuqala kwaye liyancipha.Umphandiiphandwe ngokuziphatha kwesigaba ezibini segesi eqinileyo kunye neendlela zovavanyo kunye nenani.Umphandibasebenzise i-discrete element method (DEM) ukufunda i-gas-solid injector, kwaye bafumanisa ukuba amasuntswana aqinileyo aqokelelana ngokucacileyo kufutshane nomzantsi wesandla sasekhohlo sesitofu ngenxa yamasuntswana aqinileyo omxhuzulane kunye nokujikeleza kwerhasi.

Ezi zifundo zingentla zijolise kuphela kwi-ejector kunye nesakhiwo esisodwa se-venturi, oko kukuthi, i-single-venturi effect ikhankanywe kwi-ejector. Kwintsimi yokulinganisa ukuhamba kwegesi, isixhobo esisekelwe kwi-double-effect sisetyenziswa ngokubanzi ukunyusa ukuhluka koxinzelelo kunye nokuphucula ukuchaneka kokulinganisa. Nangona kunjalo, i-ejector ene-double-venturi effect ayisoloko isetyenziselwa ukuthutha amasuntswana. Into yophando apha i-venturi powder ejector esekelwe kwi-double-venturi effect. I-ejector iqukethe i-nozzle kunye ne-venturi tube yonke. Zombini i-nozzle kunye netyhubhu ye-venturi inokuvelisa i-venturi effect, kwaye ithetha ukuba i-double-venturi effect ikhona kwi-ejector. Ukuhamba komoya kunye neejethi ezikhawulezayo ezivela kwi-nozzle ye-venturi ejector, eyenza i-vacuum field ngenxa yesiphumo se-venturi kunye neengqungquthela zemikhosi zingena kwigumbi lokufunxa phantsi kwempembelelo yobunzima kunye nokungena. Emva koko, amasuntswana ahamba kunye nokuhamba komoya.

Indlela yokudibanisa i-Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) isetyenziswe ngempumelelo kwiinkqubo eziyinkimbinkimbi zokuhamba kwegesi.Umphandiyamkela indlela ye-CFD-DEM yokumisela i-gas-particle ye-phase-phase flow flow, isigaba segesi saphathwa njengento eqhubekayo kunye nemodeli kunye ne-computational fluid dynamics (CFD), i-particle motion kunye nokungqubana kufaniswe nekhowudi ye-DEM.Umphandiyamkela indlela ye-CFD-DEM yokulinganisa ukuhamba kwegesi eshinyeneyo, i-DEM yaqeshwa ukulinganisa isigaba se-particle granular kunye ne-classical CFD isetyenziselwa ukulinganisa ukuhamba kwamanzi.Umphandiibonise ukulinganisa kwe-CFD-DEM yebhedi enerhasi eqinileyo kwaye icetywe imodeli entsha yokutsala.Umphandiiphuhlise indlela entsha yokuqinisekiswa kokulinganisa kwebhedi efakwe igesi eqinileyo ngeCFD-DEM.Umphandiisebenzise indlela edityanisiweyo ye-CFD-DEM ukulinganisa i-gas-solid flow character ngaphakathi kwemidiya ye-fibrous ukufunda impembelelo ye-fiber structure kunye neempawu zamasuntswana kwi-particle deposition kunye ne-agglomeration kwinkqubo yokucoca.

Kweli phepha, iipropati zothutho ze-powder ejectors ezisekelwe kwisiphumo esisodwa kunye ne-double-venturi kunye nefuthe lendawo yomlomo we-nozzle ekusebenzeni kokuthutha zaphandwa ngokulandelelana ngendlela yokuhlola kunye nokulinganisa kwamanani okusekelwe kwindlela yokudibanisa i-CFD-DEM.

Izigqibo

Ukusebenza kothutho lwee-ejectors ezisekelwe kwisiphumo esisodwa kunye ne-double-venturi zaphandwa ngokulandelelana ngendlela yovavanyo kunye nokulinganisa kwamanani okusekelwe kwindlela yokudibanisa i-CFD-DEM. Iziphumo ezikhoyo zibonisa isantya somoya sokunyuka kwe-particle inlet ngenxa ye-double-venturi effect, enenzuzo kwiinqununu kwi-injector. Amandla okuqhuba amasuntswana ngolwelo anyukile, okuluncedo ukuba amasuntswana adluliselwe kumgama omde.