E:
Ai r sl i des E1:Des cr i pt i onandChar ac t er i s t i c s Theai r s l i dec ons i s t soft womai ns ec t i ons .Onebei ngt hemat er i alt r ough,whi c h i st heuppers ec t i onandi sus edf ormat er i alfl ow andt hel owers ec t i onwhi c hi s us edf ort heai rt r ough.Bot hs ec t i onsar efi r ml ybol t edt oget heranddi v i dedbya l ay erofc anv as .Awi r ef abr i ci si ns t al l edatt i mesont het ops i deoft hec anv as a nda ti mp ac tp oi nt san dh i g hwea ra r e as . Wi r eMe Me shF ab r i c Ma t e r i a lT r o u gh
Ga s k e tBe t we e nSe c .
F ab r i cCa n v a s
Wat erc anwi c ki nt oai r s l i de her e.Ov e r hungl i phel pst o mi ni mi z et hi s .
Ai rT r ough
Thenor mals l opeofanai r s l i def r om i nl e tt oo ut l e ti s7°mi mi ni mum t oa bout12° max i mum.Ai ri ss upp l i edb yaf anorb l owert ot hel o wers ec t i onv i ad uc twor k . Ai rs h oul di n j ec t ed att he t op oft he s l i de wi t h mi dwa y boos t sf orv e r yl ong i ns t al l at i ons .I nj ec t i onpoi nt satt hebot t om ar enotr ec ommended. Al s oFul l er r e c o mm mme nd sab ou t1 0s c f mf o re ac hs q ua r ef o oto fc a n va san da nu nd er c a n v a s p r e s s ur eo f1 6t o1 7i n wc . Ho we v e ru nd erc e r t a i nc i r c u ms ms t a nc e ss o me mep l a nt s ar edi s c ov er i ngt hatt hi spr es s ur ec anber educ edt oasl i t t l eas8i nwc . Some ex per i ment i ngi sr equi r edt ofi ndt hec or r ec ts et t i ng.Not eal s ot hatov er aer at i on c a na dv e r s e l ya ffe c tv o l u me me t r i ce qu i p me me nts u c ha sBu c k e tEl e v a t o r sa nd F . K. Pump mps .
Upper Section Lower Section
7° to 12° Control Valve Ai r Supp ly Li ne
Ai r Supp ly Fan
Ma t e r i a lfl o wi sac c ompl i s h edb yac omb i n at i o no fa i rfl o wt hr o ug ht h ec an v as , s l opeoft heai r s l i deandt hewei ghtoft hemat er i al . Ai res sent i alfl ui di z est he po wder edmat er i als oi ts l i desdo wnt het r oughorbo x .Ho we v ert her emus tbea mi ni mum t hi c k nes sofmat er i alabov et hec anv asf ort hi st ohappen. I fi t ' st oo t hi n,ai rwi l lr i fl eupt hr oughi nl oc al i z eds pot s . Thi swi l lappear sasbubbl i ngor boi l i ngwi t hn omo v ementofmat er i al . Fort hi sr eas ona i r s l i de sc anne v erbe pur ged 100%,unl ess keeched ( sc r aped) out . Thi s may be an i mpor t ant c ons i der at i onwher ec ementc ont ami nat i oni sani s s ue. On t h eo t h erha nd o v e rfi l l i n gt h ea i r s l i d ec a nc a u s ep r o bl e ms a s we l l . Es s ent i al l yt her ei snor oom abo v et hemat er i alf orai rmo v ement . Thusai rwi l l not / c annotfl ui di z emat er i albec aus ei t ' sdeadheaded.Unf or t unat el yt her ear e ma nya i r s l i de st h ata r ee qui p ped wi t hfl o wt r i mg at eso rfl ow c o nt r o lv a l v e s . Eff ec t i v el y mat er i ali s bac k edup c r eat i ng t he s i t uat i on j us td es c r i bed. T o c o mp en s at ema nyi n s t a l l a t i o nu s eh i g he rpr e s s ur eb l o we r so rc o mp r e s s eda i r j et si nt hi ss ec t i on,butev ent hi swi l lnotal way swor k .I deal l ys uc hfl ow c ont r ol dev i c ess houl dbepl ac edi nt hec hut ef eedi ngt heai r s l i deandnott heai r s l i de i t s el f . I nt er es t i ngl ys ome s uppl i er s bui l d ai r s l i des t hats t ep up i n hei ght pr ogr es s i v el ydownhi l l .I nt heor yai re xpandsasi tdec ompr es s es .Aswel l ,on l ongi ns t al l at i ons ,mor er oom mus tbepr ov i dedf ormul t i pl ei nj ec t i onpoi nt sofai r . Suc h" h i ghbo y"uni t sar edes i gnedt omee tt hes er equi r ement s .
Gl as spor t sma ybei ns t al l edont hes i desoft heuppers ec t i ont omoni t ormat er i al fl o wa nd i n s pe c t i o nd oo r sma yb ei n s t a l l e do nt h et o ps e c t i o nf o rc l e an o ut p ur p os e san ds a mp l i n g.Ai r s l i d ev e nt i n gs h ou l dbedo nedo wns t r e am. NOTE: Wh enus i n ga na i rh os et oa i di nma t e r i a lfl o wo rc l e an i n gd on o tl e a v e t heai rbl owi ngdi r ec t l yont hec anv asast heai r / mat er i alc ombi nat i on wi l l c utt hr ought hec anv as . Ai r s l i deDes i gnCons i der at i ons Fi g ur eE1 : De!ustin Material Inlet
Flare! !uct "in i"i #es !ust pic$%up
Ai r inle t Dischare
Pr es sur i z eds houl dbei nt r oduc edatt het opoft heai r s l i de,wher ei tc anfl ui di z e t h e mat er i a lc o mi n gi n . The de du s t i ng d uc ts ho ul d be att h eb ot t o m o ft h e ai r s l i der un.Thi shel psp r omot et hedownwar dfl owofmat er i al . I nt h ea r r a ng emen ts h own i n Fi gu r e E2 ,p r e s s ur i z e da i ri si n t r od uc e da tt h e bot t om oft he ai r s l i de r un,whi c h doesnotfl ui di z e mat er i ale x ceptatt he l as t mi nut e.Thi si spar t i c ul ar l ybadi fy ouar ef eedi ngaFKpumporbuc k etel ev at or . Dedus t i ngatt het ops ho ul donl ybedonei fl ar geamount sofai rar eneededt o getmat er i alfl owi ngi nt ot heai r s l i de( e. g.s i l o) .As t r ai ghtdedus t i ngduc t sus ual l y hashi ghi nt ak ev el oc i t i es ,pr omot i ngwearandpi c k supe x ces s i v equant i t i esof dus ti ns t eadofai r .Fl ar edt r ans i t i onsar eamus t . Fi g ur eE2 :
Material Inlet
De!ustin Straih t pipe ! e!ustin De!ustin i s !one o n the up hil l si!e
Air inl et i s on the !ownhi ll si! e Air inle t
Dischare
Fi g ur eE3 : De!ustin Material Inlet
Ai r inle t
&'ih (oys& i"prove !e!ustin on lon airsli!es)
Dischare
Sho wnFi gur eE3i sa" hi ghbo y "a i r s l i de. Forl ongr uns ,t hehi ghpr es s ur ea i r i nj ec t edatt het op,depr es s ur i z esande x pa nds . The" hi ghbo y "e ns ur esr oom f ort hi sex pans i on.Wi t houti tai r fl ow maybec omer es t r i c t i v e,c aus i ngt hefl ow t o " d ea dh ea d" . Asar es u l tt h ema t e r i a lma yno tfl u i d i z ea ndfl o wp r o pe r l y . Ov e r fi l l i nganai r s l i dewi l l hav et hes ameeffec t . Ma nya i r s l i d esa r ed es i g ne d wi t hfl o wc o nt r olg at e sa ndv a l v e sasp ar to ft h e as s embl y ,s ho wni nFi gur eE4.Th i swor k sOKi ft heai r s l i d ei si nnearc ons t ant us e.Des pi t ec ons t antus e,l umpsc ans t i l lc aus et hec hambera bo v et heg at et o ov er fi l l ,r es ul t i ng i n deadheadi ng. T ypi c al l y ,af t era t empor ar ys hut down,t he ai r s l i dei snev erf ul l ypur gedandmat er i alac cumul at esaheadoft hegat e.( Thi s i ses pec i al l ybad i ns i l o appl i c at i onswher et he s i l os hut off i sl eak y . ) Gi v en eno ught i me,t hemat er i al deaer at esandbec omesdi ffic ul tt omo v et hene x tt i me
t he ai r s l i de i ss t ar t ed up. Agai nt he c hamber c an o v er fi l l ,r es ul t i ng i n d ea dh ea di n g. Fi g ur eE4 : Flow control ate
Material Inlet
De!ustin
In +etween use, "aterial can !e%aerate, co"pac t an! +l oc $ -low)
Air in le ts 'i *ressure
Lo *ressure
Dischare
Abe t t erar r angeme nti ss ho wni nFi gur eE5,wher eb yt hefl owc ont r ol gat ei s l oc at edatt heai r s l i dei nl et-n otaspar tofi t . Fi g ur eE5 : Material Inlet
De!ustin Flow control ate
Ai r inle t
(etter arran.t, airsli !e ca n pure itsel- "o re easil y) Dischare
Ai r s l i deTr i v i a: 1)
I nv ent edi nAl pena.
2 )
Ai r s l i d esn o tmi xma t e r i a l s .Se gr e ga t i o nha sb e enk n o wnt oh ap pe n.
3)
Mat er i a li nai r s l i desdoesno tfl owe v enl y .I ft hec an v asi sr i ppl edor
buc k l ed,mat er i al c anfl owi nr i v er s .Loadedoff c ent er ,mat er i al fl owc anbe deeperononev er s ust heot her-ev enaf t er50' . 4)
I ft hebedi snott hi c kenough,ai rwi l l t ak et hepat hofl eas tr es i s t anc eand
r i fl et hr ought hemat er i al .Ther es toft hemat er i al wi l l notfl ow.Sur gi ngcan oc c ur .I nc r eas i ngt hea i rpr es s ur ecanha v et hes ameeff ec t . E2:T r oubl eShoot i ngAi r s l i des Co nd i t i o n: Pl u gg ed ,ma t e r i a ln otfl o wi n g. 1. Chec kequi pmenti nf r ontofi tf orpr operoper at i on.I fatf aul t ,fi xandr epai r . 2. I fok ay ,c hec kdi s char geofs l i def orpl uggi ng.I fpl ugged,c l earpl ugup. 3. I fdi s char gei sc l ear ,c hec kai r s l i def ant oens ur ei ti sr unni ng,fi l t eri sc l ean, andt heduc twor kt ot heai r s l i dei snotpl uggedorc l os edoff. 4. I ft heabov ei sok ay ,c hec kt heai rc hamberoft hes l i def ormat er i albui l dup byt appi ngl i ght l ywi t hahammer .I fpl ugged,c hec kf orhol ei nt hec anv as .I f t he ai rc h amberi sok a y ,c hec kf orr es t r i c t i on o nt op ofc an v asand c l ear c anv asofal l r es t r i c t i onsandr es umeoper at i on.
WARNI NG:DO NOTHAMMERONTHESI DESOFTHEAI RSLI DE. Dent i ngt heai r s l i deboxwi l lc aus et hec anv ast obuc kl eorr i ppl ewhi c hwi l lr et ar d t heai r fl ow andaff ec t i ngt het r ans por tr at e.Theunev enfl owr at ewi l lal s oc aus e hol est oweari nt ot hec anv as .
