The Research Of Wet Axial Multi-channel Centrifugal Dust Device For Mine

Wit h t he cons tant i mprove me nt of me c haniz ation le vel of coa l mi ni ng,coal dust pr oble m is be comi ng mor e and more serious. A lot of dust ishar mful t o t he h eal t h o f wor kers, an d a ffect s coal mi ne sa fet y pr oduction inheadi ng face and coal face. Coal dust contr ol i s an i mpor tant i ssue.The pract ice shows t hat dusting l oc ally can get good dust e ff ectcombi ning dust col lector and ventil ati on system. Accor di ng to chi nese coalproducti on ac tualit y, des igni ng a ne w axial multi-channel centrifugal dustdevice. The dust device consists of three parts: fan, axial multi-channelcyclone dehydrator and ba ffle de hydrator. This pa per mai nly studi esstruct ure size of a xial multi-channel c yclone dehydr ator, fan sele ct ion andba ffl e de hydr ator selecti on. Structure size of a xial mul ti-channel cyclonedehydrat or inc ludes the le ngt h L, oute r cyl inder radi us R, i nner c ylinderradius r, helical channel number n and singl e hel ical channel axial length a.Because of the excavation roadway space limit, the length L is≤1.5m andouter cyli nder ra dius R is≤0.4m.The pa per calcul ate s the rela tions hip bet ween structur e size of axi almulti-channel cyclone dehydrator and collection efficiency and pressureloss in theory. The results s ho w:(1) wi t h t he i ncrea sin g o f hel i ca l c hannelnumber n(ot her struct ural paramet ers remain the same), collectionefficiency and pressure loss of axial multi-channel cyclone dehydrator alldecrease graduall y.(2) wit h the i ncrea sing of inner c ylinder ra dius r(otherstruct ural para meters remai n the same), collecti on effici ency and pressur eloss of axial multi-channel c yclone de hydr ator i ncrea se gradua lly.(3) withthe i ncreasing of singl e helical channel axial length a(ot her structur alpara met er s re mai n the sa me), c ollecti on effi ciency and pressure loss ofaxial mult i-channel cyclone dehydrator all decrease gradual ly.Acc ordi ng t o engi neeri ng practice, t he air fl ow passi ng through axialmulti-channel cyclone dehydrator is400m3/mi n.Inner cyli nder radi us r is taken as0.06m,0.08m,0.1m,0.12m,0.14m;helical c hannel number n is taken as1,2,3,4; helical channel axial lengt ha is any value,66axial multi-channel cyclone dehydrator models are desi gne d in all. Using the Realizable k–ε tur bulenc e model and Disc retemodel of FLUENT soft ware, the paper calculates all models and gets therelationship between structure size of axial multi-channel cyclonedehydrator and collection efficiency and pressure loss. Through acomparati ve analysi s, the best str uct ure si ze of axial multi-channel cyclonedehydrat or is got. The paper get s t he best spra y droplet dia me ter for thebest structure size of axial multi-channel cyclone dehydrator.The relationship between structure size of axial multi-channel cyclonedehydrat or and col lection effici ency and pressure l oss i s as foll ows:(1)when i nner cyli nder radi us r incr eases fr om0.06m t o0.14m, all dustcollecti on effici ency, r espi rable dust collecti on efficiency and pr essure l ossof axial multi-channel cyclone dehydrator models all increase gradually,whi ch is c onsi stent with theor etical r esults.(2) when single heli cal channelaxial length a i ncre ases gra dually, a ll dust c ollection efficiency, respirabledust collection effi ciency and pressur e loss of axial multi-channel cyclonedehydrat or models all dec rease graduall y, whi ch is consist e nt wit htheoretical results.(3) when helical channel number n i ncreases gr aduall y,all dust collecti on efficiency, respirable dust collection efficiency andpressure loss of axial mu lti-channel cyclone dehydrator models all decreasegraduall y, which i s cons iste nt wit h theoretical results.(4) t he str ucture sizeof axial multi-channel cyclone dehydrator be st model is as follows: thelengt h L=1.5m, out er c ylinde r ra dius R=0.4m, inner cylinder radius r=0.1m,helical c hannel number n=4and si ngle heli cal cha nnel a xial l engt h is0.1m～0.28m. Single helical c hanne l a xial le ngth of t he bes t model is0.22m in t his pa per. The best spra y droplet dia meter i s10μm～20μm for thebest structure size of axial multi-channel cyclone dehydrator.The ba ffl e dehydra tor i s P ba ffle de hydrat or. Acc ordi ng t o wi nd andpress ure l oss, t he s electe d fa n is FBD№6.0/2×15.By theor etical cal culati ons and numerical simulations, the paperdesigns a new axial multi-channel centrifugal dust device. Parame ters ofdust devi ce ar e detailed. The new axial multi-channel centrifugal dustdevic e pr ovides re ferenc e a nd gui danc e for t he developme nt of chi nese mi nedust equi pment.