Nghiên cứu sấy ngô trong máy sấy tháp dòng thẳn

NGHieN CU'U - TRAO D(!)l NGHIEN CLFU NGO TRONG DONG THANG SAY MAY S A Y T H A P / STUDY OF DRYING CORN IN CONCURRENT FLOW COLUMN DRYER PGS.TS Nguyen Dinh Tni^', ThS Do Chi Dnng= 'Vifn Ngtaen eflu TUft kf ehf tao Miy ndng ngtafp, BO Cdng Thflong 'Trfldng Dai hpc Sfl pham Ky Ulujt Hflng Yf n TOMTAT Bit bdo ndy trinh bdy kit qud nghiin ciiu qui Mnh sdy Ngo mdy sdy thdp dbng thing Ket qud nghiin cdu id tinh loan, thilt kl chl tao dUOc mau mdy sdy Ngo vdi cdc thong so chinh nhU: Chieu dil 2m, chilu rong2,Sm, chieu cao 3,6m, thl tich ldm viic ciia thdp 18,0 m> Nhd phUdng phdp mdhinh ml phong tiln phdn mem ANSYS cho thdy, nhiit dd dong tdc nhdn sdy phdn bd tiong thdp khoang 80-85'C Kit qud thuc nghiim sdy Ngi cho thdy, toe dl giim dm khodng 2.2-2,5%/h vdi vdn toe ddng tdc nhdn sdy bin tiong thdp sdy vda khoang 4,6-S,8m/s, nhiit dd khodng 8S-9iyC SU chinh llch gida mo hinh mo phong ly thuyit vi thUc nghiem khdng nhiiu, dilu dd cho thdy chl sdy tinh toan tiong mo hinh If thuyli Id hap If Tfl khda: Sdy Ngi; Mdy siy ddng thing Mdphdng mdy sdy hat ddng thing ABSTRACT are usel't^^T/T' " " ^ f °^'''''"' "^ '" " " — ' Z ' ™ - ' " " " • d^yer The study results l^'"'*'-^-^S''>i»iehe,^tis3.Sm;il.workingvolumecf^columnisl8.0nf.Tl.ou^slmu^ auto be about 80-85 C The experimental results of corn drying shows that the speed of humidity t7Z7'Za "mItionmZ '•'''^''''7''°''^^ " T J ' ' "'^- * '"'""'' '"^'^ * - - * " ' «"" ^"P^-mental Keywords: Drying corn; Concurrentflowdryer; Simulation of corn concurrentflowdryer ISSN 0866-7056 T4P CHf CO KHI VI$T NAM S6 nam 2016 www.cokhivietnam.vi! NGHieNCCrU-TRAOOOl I.DATVANDE Cay Ngd li mOt Uong nhflng d y luong thuc quan Uong Uong nfn kuih tf ndng ngUfp thf gidi eung nhfl d Viet Nam Trfn the gidi, Ngd dUflc xfp thfl vf difn Ueh, thfl vf sin Ifldng va thfl nhit vf nang suit mtdc ta tafn nay, Ngd li raOt Uong nhflng d y Udng dai^ dflflc cpi trpng df phit trien ci difn Ueh cflng nhfl ning suit va chat Iflpng 15) dung say Ngd flng dung eho khu vflc niifn ndi la rit can tiiift va cd y ngUa thfle tifn eao Uong giai doan tafn VAT LitU, PHirONG PHAP VA THIET BI NGHIEN e c u - Vdt iieu nghiin ciJa: Vjt Ufu ngtafn cflu bai bao Ii Ngd sau tiiu hoach di dflflc qua cdng doan te hat, Ngd cd dp Ira sau tiiu hoach khoang 28%, dfldng kinh Uldng dflong Sdn La la mOt nhflng tinh ving khoang 7,0ram, khdi Ifldng rieng vao khoang eao cd dit dai phi hpp vdi ntafu loai dy, die 660kg/m' bift li cay Ngd Difn Ueh tfl ntafn toan Tinh li 1.412.500 ha, ttong dd dit dang dflpc sfl dung li - PhUdngphdp nghiin cdu: Trong nghifn 753.520 (etafm 53,3% dit M nUen), quy dit cflu nay, sfl dung phflong phip ngtafn cflu If nOng ngtafp cho sin xuat Ngd la 16% Do dd, thuyit (phflong phip md phdng) va phflflng ciy Ngd li ciy Iflong thfle chi Iflc cia tinh Son phip thfle nghiem la [5J - J^iiift bi tiong nghiin cdu: Dp chinh xie cua kft qua tilflc nghifm chju inh hfldng ntafu bdi tiiift bi Cac tiuft H dflpc s i dymg ngUfn eflu nhfl ttfn hinh 1, gdm: a- Ttaft hi Iflu Iflpng va ip suit quat gid (Nhat): b- Ttaft bi nhift dO d m tay kifu sing ban (Ebro (CHLB Dflc): c- May Iflu Iflong va vjn tdc gid (Testo, CHLB Dflc) Ngoai ra, edn cd cic sensor/eim Hen nhift dO tai budng Tuy ntafn, bio quin ndng sin sau thu hda trOn tic nhan sly phuc vu cho difu khifn tfl ho?ch, dje bift la ddi vdi Ngd d tinh Son La tafn ddng ntaft dO cia ddng tic nhin say va ntaft dang 14 khiu yfu cia hi ndng dan, giy lang dd bfn ttong kfnh din tie nhin siy pta' rit ldn, Nfu Unh btah quin t^ If fliat thoit sau thu hoach Ngd etafm 15%, tiii Son La mdi nam sf rait khoing ttfn 60 ty ddng Vdi ning suit dat tfl 46 dfn 48 ta/ha, gdp phin eung d c d y miu khae ning tiiu nhip bmh quin Ifldng thfle trfn diu ngfldi d?t tij 350fcg/ ngfldi (nam 2013), dfn trung bmh 600kg/ngfldi/ nam, vfla giup ndng dan chuyfn ddi tiieo hfldng sin xuit hing hda vi xda ddi giim ngheo hieu qui [5] Df ning eao gia tti sfl dung ntafu raat cua Ngd till cac cdng doan sau thu hoach nhfl Hmh 1: Thilt bi nghiin cdu thuc nghiim lim khd, bio quan vi che bifn nham lira giim ton tiiit cung nhfl tri chat Iflpng Ngd li vifc Thiet bi nghiin cdu Thift H ngtafn eflu lim quan trpng va cin tinft CUnh bdi vjy, vifc d diy cUnh la hf Sidng miy siy thip mTkZl quan tim ngtaen cUu chejjo tiuft H miy siy dan tic nhin siy, nguyin ly/kft ciu c i a l ^ f b i ndi Chung va miy siy tiiap ddng tiling ndi rifng nhfl ttfn Unh cuauuetDl^ ISSN 0866-7056 TAP CHl CO KHl V i t T NAM, Sd nim 2016 www.cokhivietnani.vn NGHI§N CU'U - TRAO B(5l + Ddi vdi hat vat Ufu cd d ^ g hinh cm (hoje Uldng dflong), kta dd: b^ = 5rfjV* (i); -f Ddi vdi hat vjt Ueu cd dang hinh vudng, htoh chfl nhjt (hojc Uldng dflong), dd: b,^ = d „ V a - ) * ( ) , d day: d,- dO ldn cia hat; k = 0,6 1,5 - He sd phu tiiupe Unh Tfl kft qui ngtafn eflu nhfl ttfn Unh 3, Hinh 2: Nguyin ly cua thiit bi nghien cdu (thip sdy)va eac phflong trinh Unh toin (1), (2) nhfl nfu ttfn, tic gii da xac dinh dfl((c khoing d e h tdi K £ T Q U A NGHIEN CCVS VA B A N L U ^ N tUeu, tfl dd xac djnh dfloc nguyfn 1^ mau miy say Ngd kifn tiiip cd kft elu va so dd bd tti kfnh 3.1 Kft qud tinh toin tUft kf din tic nhan siy, kfnh thii am nhfl htoh Qua ngtafn cflu thim dd thfle ngtaem cho Uily, vifc xic dinh dflpc dung khoing cich tdi tiileu bram [6,7], (Unh 3) cho "khdi" vjt Ufu cd tilf chay dflpc bfn ttfn kfnh say li rit quan ttpng ddi vdi may sly kifu tiiip ed kfnh din, dd li cd sd cho viee "phi vfl" Uen kft "vdm" gifla khdi vjt Ufu vdi bf mjt kfnh siy Hinh 4: Sadi bl tii kenh ddn tdc nhdn sdy vd kenh thdi dm tiin thdp Htoh cho thiy, vjt Ufu chuyfn dOng len Idi qua khe hd gifla cae kfnh din tie nhin siy vi kfnh thii am, tfl tfl lip diy cie chd ttdng tiiip Kenh din tic nhan sly vi kfnh tiiii am dflpe bd tri sen ke nhau, so dd dfldng dich chuyfn ci ddng tic nhin say vi ddng hdi im bfn anh 3: Khoing each tit thilu bmin gida hai kinh sdyttong tiiip dflflc difn ta nhfl trfn Unh dua trin hinh dang cda vdt liiu El Theo J Tomas cho thiy, df vjt Ufu ed tilf chiy dflflc ttfn jt ngtafng (vdi gdc cdn nao do) cin xic dinh dflpc khoing each tdi tiiieu bmta nhfl ttf n hinh Cd sd df xac dinh khoang cich ''™ phdngcdticdungtiftkifmtiieu^gianvictapta ""^'^ " " i r i ^ i r ^ S r " ' ' ' " ^ " ^ - L , , ISSNOS66-70S6 TAP CHf C O K H f V l l T NAM, S66n5m 2016 wwwxokhivietnain.vn NGHieN CU'U - TRAO D(!)l Tfl kft qui md phdng nhfl ttfn htah 7, cho tiiay trfldng phin bd ntaft dO ttong tiiip sly dn dinh, kft qua dflpc tiif hifn bang cic gii tri do, hojc thdng qua sti thay ddi ve man sac hay gii tri tren thang etaa ntaft dp Qua hinh eho thiy, nhiet dp trfn tit ca d e mifn cia kenh gid ndng dat dflpe gia tri cao nhit dat khoang SS^C-SS^C va giam dan theo xu hfldng xa dan kenh gid ndng cho den kfnh tiioat ira tta ntaft dp tai diy la tiiap nhit khoing 28 "C-32°C, Ui kft qui phan tich cho tiiay, sfl phin bd ntaft dn dinh theo nguyen ly lam vifc cia hf thdng sly Kifm tra kft qua eia qui tttoh phin tich sfl truyen ntaft de dinh gii sfl p h i hpp vf kft ciu, lfla chpn vjt Ufu che tao thip say, ddng tildi dfla vao dd, ngfldi ta ed tilf dem so sanh dinh gii vdi kft qui khao nghifm sau niy - Vf kft qui vjn tdc, tdc dO ddng tic nhin siy bfn kfnh din da dflflc dac xic djnh tai cic difm A, B, C, D, E nhfl ttfn 3, theo trinh tfl tfl dfldi len ttfn va tfl vi tri dau vio den vi tri diu eia kfnh dan, kft qua Cfl tile dflflc tiie Ufn nhfl ttfn hinh Hinh 9: Xic dinh gid tri vd sUphdn blv^n tic d tdc nhdn sdytiongthdp sdy 3.3 Ket qua thtfc ngUf m t ji co sd sin xuat •*• K £ T LUAN T^i eo sd sin xuit, tie gii dl tip hpp dupe d c sd Ufu tfl d»c tilflc ngtaf vf ntaft dp tic nhin siy, tdc dO giira Im ttong qui tttoh sly vi tdc dp eia ddng tic nhin sty bfn ttong kenh din, cu thf: - Kft qua ngtafn eflu da tinh toin tiiift kf chf tao dfla dflpc raau miy sly Ngd nang suit tJn/h phfl hflp vdi tiiflc tifn sin xuit vdi cae thdng sd chinh cia may xic djnh dflflc nhfl sau: Chifu dii m: etaeu rdng 2,5 ra; etafu cao 3,6 ra; thf tieh lam vlfe cia tiiip 18 ra' - Vf ket qui tdc dp giam Im ttong qua trinh siy, dflpe tiif tafn nhfl ttfn Qua - Tde giim am kta saytilflci ^ f m diy, ehp tiiay tde dO giim am kta sly Ngd (btoh qua ttinh san xuit vao khoing 2a-2,5%/h, vdi nhift quin khoing 2,2-2,5%/h), vdi nUft dO tic nhin ddng tie nhan sly vio khoing 85-90°C siy khoang 85-90»C, nhU vjy mdi dim bao dupe chit lupng sin phim say - Kft qua md phdng vf trang tiiii dn dinh ntaft ttong tiiip cho tiiay, sfl phin bd nhift ddng tie nhin siy cic kfnh vio khoing 80-85-0 Nhu vay, khOng chfnh Ifch ntafu so vdi thfle nghiem - Van tdc ddng tic nhin siy bfn ttong tiiip say vao khoang 4,8-5,8ni/s (ddi vdi vi tii diu kfnh), khoing 4,6-5,6ni/s (ddi vdi vi tti cudi kfnh) H,.L„.n., ,, , , Tfl nhflng kft qui nghifn eflu niy lira cfl ntnn Dd thl toe giam am sdy thUc nghiim sd khoa hpc cho vifc phit trifn tiiinh miu miy tiong sdn xudt Idn quy md cdng ngUfp • ISSN 0S66-7056 TAP CHl CO KHl VitT NAM, Sd nam 2016 www.cokhivietnam.vn NGHieNClJ'U-TRAOe(!)l Ngiy nhan bii: 12/5/2016 Ngiy phin bifn: 08/6/2016 Tai lien tham khao: I i ' i r f ^ " ' ^ ™ " " ' ^ ' ' * ' " " ^"^^^ TnmsferSimuiatian during Drying Using Finite Element meth Worid Apphed Sioences JoumaL [21^NguySn Dinh Ttaig va cpng su (2014); N^ien cdu, Hnh todn Ihilt kl chl tao miy sdy lac kilu thip ndng »!* toi/i™ a-„j i„„g cfto Wu VUt mi&i miipWa Boc Df tii nghifn cflu d p Bd Cdng Thuong 13 Nguyin Dinh Tflng; N^Uln cdu Ihuc n^iiim sdy lac cutitai.Tap chi Cdng nghiip ndng than, Hfi Co Nong ngtaep Viet Nam sd 16/2015 o « -i- s v «iu 14) KROLL, K (1978): Wmungstedmik, Tmdcner and Twcknungsver/dhren Zweiter Baud Springer Verl Berhn Heidelberg New York 1978 ^ ^ ^^^-^.^t^ Tung va cdng sfl (2014): N^iin cdu tinh tadn thietkl chl too miy sdy Ngd Uhinh ndng smt 500-1.000 (:^nie,De tai ngtaen cflu c%Bd Cdng Thuong vnannnang S u ^ ^ ' ' ' ^ ' ^ ' ' Mechanische Verfahrenstechnik Skript zur Voriesung Umvemtat Magdebm S u ^ ^ d ' ' ' ™ * ' ' '^"'""""^ Verfahrenstedmik Skript zur Vorlesung, Unive^tlt Magdeburg ISSN 0866-7056 TAP CHi CO KHf VlfiT NAM S66n§m 2016 www.cokhivietnaiii.vn ... tfl ntafn toan Tinh li 1.412.500 ha, ttong dd dit dang dflpc sfl dung li - PhUdngphdp nghiin cdu: Trong nghifn 753.520 (etafm 53,3% dit M nUen), quy dit cflu nay, sfl dung phflong phip ngtafn cflu