Tgp chi Khoa hpc Tnrang Dgi hge Cdn Tha Phan A: Khoa hgc Tic nhien. Cdng nghe vd Mdi trit&ng: 30 (2014) • 30-38
Tap chf Khoa hoc Tru'dng Dai hoc Can Thd
•website: sj.ctu.edu.vn
TINH TOAN THIET KE SILO TON TRU* CAM VIEN NANG SUAT 500 TAN
Nguyin Van Cuang' va Nguyen Hoai Tan^
' Khoa Cong nghe, Trudng Dgi hgc Can Tho
^ Hgc vien cao hgc Co khi Chi tgo mdy K2010, Khoa Cong nghe, Trudng Dgi hoc Cdn Tho Thdng tin chung:
Ngdy nhdn: 25/06/2013 Ngdy chdp nhdn: 25/02/2014 TUle:
Design of rice bran pellet storage silo with capacity of 500 ions
Tie khoa:
Silo, silo ton trif, thiit ki silo, silo ton trie cdm viin Keywords:
Silo, storage silo, silo design.
rice bran pellet storage silo
ABSTRACT
A storage silo nowcuiays is known as a useful device for storing raw materials and products of rice and rice bran oil processing plants in the Mekong Delta. However, most existing storage silos at the plant were imported with high investment costs, and lacked ventilation inside the silo, especially those for rice bran storage in rice bran oil processing plants.
The objective of this study is to design a rice bran storage silo with capacity of 500 tons for the storage and preservation of rice bran for bran oil extraction process This designed silo is based on Eurocode standards, having the ability lo withstand winds of 160 km/h and earthquake of magnitude between 6 to 7 on the Richter scale. The designed silo also has the ventilation structures to decrease and limit the rehydration of the product, prevent clots and clogs when storing bran pellets. The designed silo has the diameter of 8.09 m; the overall height of 2 7.73 m; and the wall thickness of 10 mm, 8 mm, and 6 mm, respectively at different heights. The silo is made of CT3 plate sleel This investment cost is lower than that of imported silos.
TOM TAT
Silo ton trir duac xem Id mot thiet bi huu hiiu cho viic ton trir nguyin lieu, sdn phdm a cdc nhd mdy sdn xudt, che bien liia ggo, ddu cdm a Dong bdng song Ciru Long hien nay. Tuy nhiin, hdu hit cdc silo ton trie hien co a cdc nhd mdy deu nhdp tir nude ngodi, chi phi ddu tu cao, co nhugc diim trong viic thong thodng gio ben trong silo ton trir, dgc biet doi vdi silo ton trie cdm viin trong cdc nhd mdy che biin ddu cdm. Muc tiiu cua nghien ciru la thiit ki silo chira cdm vien vdi ndng sudt chua 500 tdn nhdm ton trie, bdo qudn phuc vu cho qud trinh trich ly ddu cdm. Thiet ke ndy dya theo tiiu chudn Eurocode, vdi khd ndng chiu diroc sire gio 160 km/gid vd do dgng ddt 6 -^7 do richte. Thiit ke co bg phgn thong po trong silo nhdm khd ndng chong hut dm trd lgi ciia sdn phdm, han che khd ndng von cue, tdt nghen silo trong qud trinh ton trii ciia cdm viin. Kit cdu silo dgt duac cd kich thudc dudng kinh 8,09 m; tong chiiu cao 27,73 m; bi ddy thdnh silo ldn luat Id 10 mm, 8 mm vd 6 mm tuang img vdi timg do cao khdc nhau. vdi vdt lieu che tgo Id thep tdm CT3. Chi phi ddu tu gidm nhiiu so vdi vdi thiit bi nhdp ttr nude ngodi.
Tgp chi Khoa hpc Tmong Dgi hgc Can Tha 1 GIOI THIEU
Silo Id mdt dang thilt bi bdo qudn kin thudng dugc Sli dung dl du tru luong tiiuc d quy md ldn tir vdi trdm din vdi ngan tdn. Vdi vai ttd quan ttgng ttong cdc ngdnh cdng nghiep chl bien, silo cd the dimg dl luu trif nhilu loai vdt lieu khde nMu tir sdn phdm ndng nghiep nhu Iiia, gao, cdc loai hat den cdc sdn phdm cdng nghigp nhu xi mdng, than vd mdt sd lo?i nguyen vdt lieu khdc.
Silo dd duge phdt trien tir thi ky 19, eho den nay da ed rdt nhilu nghign cuu vg kha ndng ung dung ciJng nhu cac dac tinh. ket cau cua silo. Thuc tl cho thdy rdng frong qud trinh sii dung silo, ed nhilu vdn de cdn dugc quan tdm nghien cuu nhu dg bien dang eua silo, khd nang thdng thodng gio ttong silo, kgt cau thdnh silo, cung nhu khd ndng ddng vdn ciia sdn phdm bao qudn, va cac van dg Iign quan khde. Wong Hong Wu da nghien ciiu, phdn tich tTnh vd ddng hgc eiia ddng chay eae loai vdt lieu trong silo, md hinh hda qud ttinh nhdp va thao lieu ra khoi silo, dua ra nhimg phuong phap sd nhdm du dodn iing sudt bgn ttong silo do vdt lieu chda tgo ra dudi tdc ddng cua digu kign mdi trudng (Wong Hong Wu, 1990). Viec phdn tich cdu ttiic ciia silo thep bdng phucmg phap phan tii hiiu hcin cung da dugc nghien cuu nhdm ndng cao su hieu biet ve su bien dang vd su dd sup eua silo ttong qud trinh tdn trii, tir do cd bien p h ^ hd ttg tdt hon cho viec thigt kg vd xdy dung silo (Hongyu Li, 1994). Tdc gid dd ket ludn rang mdt silo ddy du gdm ed vd hinh tru va dng cdn dido lieu va vdm cdn che phia ttgn dng vd hinh tru. Md binh dnh hudng cua rung ddng den ddng chdy ciia da vdi CaCOs ttong he thing silo chiia da dugc nghign cuu (Jesper K. 2008).
Hign nay, cdc silo cd nang sudt chira ldn dugc Sli dung d edc cdng ty, xi nghigp ttong nude da phdn dugc nhdp tir nude ngodi. Mdt sd nghign ciru vg silo bdo quan cung da dugc thuc hien bdi cdc nhd nghidn ciiu vd chuyen gia ttong nude. Nhdm nghign eiiu cua Trudng DHBK TPHCM da chl tao thdnh cdng he thdng silo bdo qudn cdc loai hat ndng sdn xudt khdu quy md 250 tdn vdo ndm 2003 (Bili Song Cdu, 2003), ddy la he thdng silo dau tien duge sdn xudt ttong nude, vd dugc ldp ddt tai chg trung tdm ndng san Long An; tuy nhien silo nay dimg ehlia liia - gao, khdng ed he thdng thdng gid bgn ttong. Viec xay dung chuang ttinh tinh toan silo dung ngdn ngu APDL (ANSYS Paramettie Design Language) va Visual Basis da dugc thuc hien ndm 2010 (Nguygn Tudng Long, 2010), dl tai
Phdn A: Khoa hgc Ttt nhien. Cong nghe va Moi truang: 30 (2014): 30-38 nay da xay dung mgt chuong trinh tinh todn, kilm tta bin, hudng toi viec tdi uu edc bdn thilt kl silo.
Cdm gao chiem khoang 8% ttgng lugng h?t liia, chiia hdu hit lugng dau va phdn ldn lugng chdt dam, cde chdt khoang, vitamin, va chdt xo tieu hoa dugc ttong hat Ihde. Ham lugng dau trong edm gao udc tinh khodng 18%. Tuy nhien, do cdng n^g xay xdt, chi co khoang 3% edm gao cd thi sii: dung dl trich ly ddu, tuong duang 3,5 trieu tdn ddu tho (www.wilmar-agro.com.vn). Theo tdng cue thdng ke, hai^ nam Viet Nam cd s ^ lugng khoang ttgn 47 trieu tdn lua, tten 28 trieu tki gao va hon 3 trieu tdn edm (www.gso.gov.vn); trong dd, chi co khodng 500 ngan tdn cdm dat phdm chdt dugc sii dung ttong cdng nghiep sdn xudt ddu dn. Da so cdc doanh nghigp sdn xudt lua - gao, ddu cam deu tin trii cam ttong bao ehiia 50 kg chdt thdnh cdy frong kho. Vi thi, cam rdt dg bi dm mde, cdn trung pha hoai, giam chdt lugng va tdn thdt ngu khdng dugc thdng thoang va bao qudn tdt. Mdt sd nhd mdy san xudt ddu cam dd su dung silo tdn frtr ngoai iil%, ehi phi ddu tu cao, ylu digm kJ thuat la khdng c6 hg thdng thdng gid, gdy ra viee vdn cue, bam dftih vao thanh silo. Cdng ty TNHH Wilmar Agio Viet Nam, Chi nhdnh Thdt Ndt va Can Tho, da ddu tir silo dugc thidt kg va che tao bdi cdng ty REKANA - Malaysia, nang sudt chiia tir khoang 400 den 450 tan, gid thanh che tao lap ddt khodng 2,6 ty ddng (nam 2011). Theo kgt qua phdng vdn til can bd ky thuat cua cdng ty, nhugc diem cua silo la nhiet d?
ttong silo cao, silo bi nghet do hign tugng vdn cyc cua cdm, dgng dm ttgn thanh silo. Vdi muc tiSu thigt kg silo de che tao silo ngi dia gid thanh h?, co he thdng thdng gid ben ttong, khde phuc cdc nhugc digm hien tai; nghign ciiu ndy nhdm tinh todn va thigt ke cdi tien silo tdn trir nang sudt 500 tdn, diing bao quan cam d nha mdy sdn xuat ddu cdm hien nay d DBSCL.
2 V4T LIEU VA PHU'ONG PHAP THIET KE
2.1 Vat lieu che tao silo
Dua vao dac tinh ciia vdt ligu tdn ttit, tinh ket cdu cua silo; vat lieu duge chgn dl chl tao silo la thep tdm CT3 vdi bg day khae nhau dugc tinh: toan dam bdo edc dilu kign bin cua silo. Phdn mong cdt cho silo dugc Idm bdng vdt lieu be tdng cdt thep mac 250.
2.2 Phuong phap nghien cuu
Phuang phap luge khdo edc tdi ligu vg eo sd lij thuyet ttong Unh toan, thilt kl va bdo qudn bdn|;
silo; eac t^ lieu nghign ciiu vl silo da edng bo
Tgp chi Khoa hgc Tnrdng Dai hgc Can Tha dugc Sli dung de ldm eo so thilt kl. Ngodi ra, viec khdo sat thuc tl cdc silo chiia cam vign hien cd, phdng vdn ehuygn gia cua mdt sd nhd may sdn xudt dau cam tai Cdn Tha eiing dugc thue hien dl ldm casd cho vigc tinh toan vd thilt kl, cdi tiln. Ban ve thiet kg eua silo dugc thuc hien dua ttgn phdn mim AutoCAD va Inventor.
Qui trinh tinh todn thilt kl silo dugc thi hien qua sa dd chung nhu Hinh 1.
Phan A: Khoa hgc Ty nhien. Cong nghe vd Moi tnt&ng: 30 (2014): 30-38
Thiet ke Sff bg
Tinh toan ap lire tac dgng len silo
Tinh toan sue ben ciia silo
Tinh toan thong gio trong silo
Tinh toan nen mong cho silo Hinh 1: Qui trinh thiet ke silo Qua trinh thilt kl dga ttgn chudn EuroCode.
Ddy la tidu chuan dugc thiet lap bdi cac nude thdnh vien eiia khdi edng ddng chdu Au (EU) nhdm thdng nhdt ede tieu ehudn kJ thudt vg kgt cau frong nhigu linh vue 1^ thugt, ttong dd ed kgt edu cho vigc tinh todn. thiet ke vd xdy dung silo.
3 TINH TOAN THIET KE SILO 3.1 Thiet k l so bg silo
Viec thilt kl so bg vd chgn so dd silo ed y nghia quan ttgng cho ede buoc tinh toan, thiet kg ehinh xac ede bd phdn ciia silo. Xudt phat tir yeu edu nang sudt chiia Id 500 tdn, silo thilt ke dugc lua chgn Id silo dang tru ttdn day hinh chdp. dung mdi ghep hdn de Idm kin, kich thudc so b^ ciia silo dugc tirdi todn vdi 3 phdn: dinh. day va than silo.
Cdc dde trung hinh hge ciia silo cdn thilt kl dua tren chudn EuroCode dugc the hien d Hinh 2.
Hinh 2: D^c tnmg hinh hgc ciia silo 1 - mat phdng tuang duong, 2 - than silo, 3 - vi tri tigp gidp giua than vd day silo.
he: chieu cao tinh toan tru ttdn, ht: chilu cao day silo, A^- chigu cao tdng edng,
ho: do sdu tuong duang cua khdi hat d phdn dinh. fa^,: do eao tdng cdng ciia khdi hat tten phdn dinh, dc: dudng kinh silo, r : ban kinh ttong eiia silo, t : be day vach silo,
^j.: gde ma sdt nghi cua vdt ligu, /?: gde nghieng day silo.
Dudng kinh ciia ra ciia silo dugc xde djnh theo cdng thiic 1:
Dg=0,25h^ . (1) He sd dnh hudng eua ra ff dugc xac dinh:
f , . j ^ . i l * m ) 0 (2) LTng sudt tuang duong tac dimg ldn thdnh silo
Trong do:
y : ttgng lugng rieng ciia vdt lieu chua (chgn 7 - 4 80 kg/m' vdi cam vien cd dm do 8 -^ 10%)
Q = 0,8 : he sd tdi ttgng
f^: He sd ma sat ciia vdt lieu vdi thdnh silo m; he sd dac tnmg binh hgc, m = 1 vdi silo ed Ciia thao dang ttdn.
Vdi digu kien ciia ra cua silo:
Tap chi Kliaa hgc Tnr&ng Dgi hpc Cdn Tha
D,z- f y{\ + m)
Vdi ndng sudt chiia 500 tdn, thi fr'ch can thigt kl Id: V = ^ = i 2 2 . . 1 0 4 I m ^ ; Cac gid tti:
" y 0,48
ha = 6,5 m; he = 18 m; dc = 8,09 m: ho - 0,81 m; DB
= 2 m dugc xac dinh.
3.2 Tinh toan ap Igc
Viec tinh todn nhiJng ap lue tdc dung Idn silo cd y nghTa quan ttgng ldm ea sd cho viec tinh bgn va chgn kit cdu silo. Viec tinh toan duge thuc hien dua ttgn CO sd ly thuyet tinh toan va thigt ke silo theo chudn EuroCode. Hinh 3 thi hien cac dp lire tdc dung ldn thdnh vdeh silo ttong qua trinh tdn trii.
Vdt ligu chg tao silo Id thep tam CT3 co ung sudt bin [a- ] = 380 N I mm - ^ 380.10' kN/m-. Ap luc tac dung len silo gdm eo dp lue tde dung len phdn than silo (tru ttdn), dp luc tdc dung Ign phdn day silo (phlu), dp luc tdc dung do silo bi lech tdm vd dp lge tdc dyng do siie gid.
3.2.1 Ap luc tdc dung lin phdn thdn tru iron cua silo
Ap lge tdc dung theo phuang ngang:
P,f=P^.Yji=) (3)
I; Khoa hpc Ttr nhien. Cong ngh? va Moi tniong: 30 (2014): 30-38 Ap lire tac dung theo phuong tilp tuyin:
P.f=^^-PkJM) (4) Ap luc tdc dung theo phuang dung;
(5) Ap lue tac d\mg theo phuang dung tinh (6)
II ''..
^^^ 2 P'-r\
Hinh 3: Ap luc tac dung len thanh vach silo.
1 - mit phang tirang dinmg, 2 - ap luc ngang tdc dgng len than tru
P.f = Pyf-Q Trong do:
p^ - y .k .z f, : gia tri dp luc tai miic cao nhdt ho ung vdi vdt lieu tiep xiic vdi vdeh.
_ ^ ^ A. = 9,27 m
^" k.p'V A - dien tich tiet dien ngang
U - ngi chu vi tigt dign r j ( z ) = i - < . - ' " •
z - dd sdu dudi mat phang tuong duong ciia vdt ligu (zmax = 18 m)
k = 0,54 - hg so dp lue ngang do dnh hudng ciia vdt ligu
Cb = 1,3 - he sd khulch deu luc tgi day silo P = fg^r" ^§22" = 0.404 - he sd ma sdt tten vdeh diing (ehgn goc ma sat nghi Id 22°).
3.2.2 Ap lye tdc dung len ddy silo dangphiu hinh con
Ap lue vd so do iing sudt tde dung ldn ddy silo (phlu) duge thi hien trong Hinh 4.
Hinh 4: Ap Igc tac dyng len day silo 33
Tgp chi Khoa hgc Tntang Dai hgc Cdn Tha Phdn .4 Khoa hgc Tu nhien. Cong nghe vd Moi trucmg: 30 i20l4i: 30-38 Ap luc tac dgng len vach dieo phuang phdp
(7) tuyen:
Pnf=Pn5-^P„2+iPnl-Pn2)- 'ft Voi cdc thdnh phdn luc:
Pni = P.f, (Cfc sin' fi+cos^ fi) Pn2 =P,^.C^.sm- fi
- A yk , „ P„s=^~.-~.cos'fi
U ^p
- Ap luc tde dung len vach theo phuong tigp tuyen:
Ptf = M-P„f (8) Trong dd: /7,^ : gia tti ciia dp luc diing /?^tai
mdt phdng ehuyin tilp X - do ddi giira 0 vd lb Ih - chieu ddi phan pheu
pyft - gid tti dp lue theo phuang dung tai vi tti chuyin tilp khi z = zt
P - gde nghieng ciia pheu A — dign tich tigt dign silo U — ndi chu vi tiet dign silo.
3.2.3 Ap luc tdc dung len silo do hi lech tdm Ap luc tde dung len silo do lgch tdm do viec nap vdt lieu gdy ra (Hinh 5), dugc xdc djnh theo edng thijc 9.
Trong do:
C ^ = 0 , 2 I C ^ ( I + 2 £ = X l - e " ' " ' ^ " ) la he so
J =;r—^ : chieu cao phan thanh silo ma tai tac 16
dong len (Hinh 5) e , = 0 , 2 5 r f = 2,02 m
Hinh 5: Ap tire tac dung len silo do bi Idch tam zp - khoang cdch giua mdt phdng tuong dirang vd phdn gia c<
hp- khoang cdch giira mgt phdng chuyen Hep vd phan gia cd e, - khoang lech nho nhdi theo phuang nghieng ef - khoang lech lan nhdi tl
$ - goc lich ldm eo - bdn kinh cua ra silo
Tap M Khca Im T„^g Dai hoc Cin m, Phin A Khoa hoc Ti, Men. Cong nghi vo Mdl mrong- 30 (2014): 30-lS
3.2.4 Tinh ben do idc dung gio lin silo Tdc do gid dugc chgn eho tinb todn thiet ke silo Id 160 km/Ti mong iing frong tnidng hgp mua bao ldn xay ra; viec tinh todn bin ciia silo dugc dua frgn CO sd chudn Eurocode. U'ng sudt tdc ddng len silo duge thi hign ttong Hinh 5 vd duge tinh theo cdng thiic 10.
0,56/„.£
(/(l+0,004£/>')
(10)
Vdi: ta - chieu ddy thanh vach silo.
E = 2,1.10" N/m^- mddun ddn hdi.
y = 206,84.10^ N/m- - dp Igc iing vm dudng kinh chuan theo Eurocode.
d = 8,09 m - dudng kinh silo.
Tgi mat cdt A-A:
a = 0.56.0,00235.2.1.10" ,54.405 W/™=< [a]
' (1 + 0,004.2,1.10"/206,84.10*) Tai mat cjt B-B:
0,56.0.00196.2.1.10" . , , . , , „ , 2 r i a = 7-=545.543 *A'/m<lCT|
' (1+0,004.2,1.10"/206,84.10') Tai mJt cat C-C:
0,56.0,0021.2,1.10" . o , o < : n , , 2 r 1
• (1 + 0,004.2,1.10"/206,84.10') ^ '
2441.88 N/m2
2298 26N/m2
2106,73 t*m2
1819.44 Ntoi2 11580.04 N)m2
1244.88 N/m2
... _ S^
ct "
-h
rs
03 05
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Hinh 6: Sff do ihig suit tac dgng len silo v « tk d? gio 160 km/h theo chuSn Eurocode 3.2 5 Lifc lac dijng len silo
Lire tac dyng len silo duoe xac dinh theo cong thuc 11:
fv, = rj.,
-(f)-(fj
(11)Tgp chi Klioa hpc Tntang Dgi hgc Cdn Tha Phdn A: Khoa hgc Ty nhien. Cong nghe vd Mdi fntcmg: 30 (2014): 30-38 Trong dd: Do = 8,09 m - dudng kinh ngoai silo
D, = 8,064 m - dudng kinh ttong trung binh ciia silo
1 - chilu cao doan cdt
y = 7800 kg/m^ - ttgng lugng rieng cua vat lieu thep chl tao silo.
Dua vdo chudn Eurocode, cdc mat cdt dugc chgn la A-A, B-B vd C-C tuong iing vdi do cao (xem Hinh 6), luc tde dung len silo dugc xde dinh cd gia Ui tuong duong 235 kN, 345 kN va 635 kN.
3.2.6 Tinh todn chiiu ddy thdnh silo Chigu day thdnh silo phu thugc vdo iing sudt tdc dung theo chieu cao ciia silo, cdng thiic tmh chilu day thanh ta nhu sau:
16.D„.A/, W, -(12)
" 7r[Dl+D;){D„-i-D,\o.E 7T{D^^D,\a.E U'ng vdi ede mdt cdt A-A, B-B vd C-C, chilu ddy thdnh silo dugc xde dinh tuong iing Id 10 mm, 8 nun vd 6 mm.
3.3 Tinh todn thdng gid trong silo Vigc thdng thodng gid ttong silo tdn trii cdm vien hign Id vdn dg d^t ra dii vdi viee tdn frU bdng silo d eae nha mdy. Trong nghidn eiiu nay, bd phdn thdng'tiiodng gid cua silo chiia cam dugc thiet kg vdi so dd 6 Hinh 7. Qua trinh tinh todn lim lugng khdng khi cdn thidt cho viee thdng thoang frong silo dira tten lugng thdi nhigt thira ttong qud trinh tdn trii; ket qua hoan todn phu hgp vdi phuang p h ^ tiidng gid cudng buc vdi luu lugng quat gid dugc chgn ldn ban.
Luu lugng khdng khi cdn thilt dl thai nhiet thira
(jn^lh) (13) 0,24.p„.(/.-/.,)
Trong dd: Q^ = 3219 kCal/h - lugng nhiet thira ttong khdng gian chua
t[. tv - nhigt do khdng khi thdi m (45°C) va hiit vdo (40°C)
Pkk - khdi lugng ridng eiia khdng khi.
- Cgt dp t^o nen sg ehuygn ddng ciia khdng khi:
H = g.h.iy,-rr) (14) Trong dd: h = hi + hi Id khoang each giiia ciia
edp gid vdo va thai ra
tr, t Yj., y^ - nhiet do vd ttgng lugng rieng cua khdng khi ben ttong vd ngodi silo.
y.^ = 1,125 kg I m^ img vdi ti < 43 "C 7;^ =l,135fcg/7K'iing vdi tN = 38 °C
Cdt dp tao nen su chuydn ddng khong khi vdo:
Cdt dp xa khi ra:
^2 = gMrN-rT)
(15)
(16)
r ^
h-ri
\
U
/
1/
V n a g tmng hoa
Gio Uidi \'ao
r
Hinh 7: So* do thdng gid trong silo - Tdc do chuyen ddng khdng khi qua ciia vdo Wi va ciia thdi W2 eiia silo:
--1,55 m/s Luu lugng khdng khi qua cira vdo:
i l = F i . W i . / / , = 4 9 2 m ^ / h
Luu lugng khdng khi qua ciia thai:
Lj = i s . Wj .//2 = 631 m^/h
Trong dd: Fi, F2 - dien tieh tiet dien eua vdo (d
= 0.4 m) vd cua tiidi (2 x 0,3 m)
p^=p^=Q.,% - he sd luu lugng khong khi qua ciia vdo va eiia thai
hi, h? - khodng each giQa ciia cap gid vdo, gid ra vdi dudng trung hda.
7(gj chi Khoa hgc Trucmg Dgi hgc Cdn Tha 4 KET QUA VA THAO LUAN Nghien ciru da tinh todn vd thilt kl dugc silo theo tigu chudn Eurocode. Cdc thdng sd ve vdt lieu ton trii va nhimg kich thudc cua silo dugc thd Wen ttong Bdng 1. Vdt lieu chl tao silo dugc chpn bdng thep CT3. So dd ban vg silo thilt kl dugc the hign ttong Hinh 8. He thdng thdng gid trong silo cd thg gidi quylt dugc vdn dg dang tdn dgng hign nay tai cdc nhd mdy sdn xudt ddu cam, gidm dugc lugng tdn thdt, ttanh dugc hign tugng vdn cue, kgt dinh vao thdnh silo.
Bang 1: Cdc thong so v^t Ueu tdn trii vd thdng so thilt ke silo
Khoa hpc Tlt nhlin. Cong nghe vd .Moi nuang- 30 (2014). 30-38 eiia cac silo dang dugc sii dung ttong ede nha mdy, edng ty hien nay. Nhdm nghien ciiu da su dgng phdn mim inventor dl thilt kl, md phdng qud ttinh ldp dat silo, ciing nhu qua trinh tiidng gid trong silo vdi kit qua hoan toan kha thi cho chd X^o va van hdnh.
Thdng so Ket qua
Nang sudt chiia ciia silo 500 tdn Dudng kmh thigt ke silo 8.09 m Dudng kinh ddy silo DB T n m (ciia thdo)
T6"^ ehieu cao ciia silo Chieu cao phdn hinh try 18,6 m Chieu eao phdn ddy cdn 6,3 m Chigu eao phdn nap silo 0,83 m Chieu ddy thdnh silo nhu Hinh 8
1 0 m m - 8 m m - 6 Tdc dg gid chpn cho thiet ke 160 km/gid Qugt thdi ldm mdt
Cdng sudt: N= 15 kW
Luu lugng 2.000^
2.300 m%
Goc nghieng ciia phdn day
cdn silo p=26''
Vdt ligu chg tgo silo Vdt li?u la ong dudng ddn khdng khi vdo
Thep tdm CT3 Thep dng q) = 400 mm Vdt ligu lam mdng, cgt cho silo
Bg tdng cdt thep mac 250
Du todn kinh phi chg tao lap ddt (Nguyen Hodi Tdn, 2013)
1,86 ty ddng Qud trinh tinh todn thdng gid theo didu kign cua Vigt Nam img vdi nhiet dg vd dm do eua mdi tnidng d Ddng bdng sdng Ciru Long. Quat gid thdng thoang khi ttong silo dugc thidt ke vd ddt phia dudi. khdng khi thdi vdo dugc phdn phdi deu ttong silo nhd vdo hg thdng dng dan. Trong qua trinh bdo qudn, khdng khi ndy vira ldm nhi^m vu gidi nhi?t thira khi bao quan, vira cd tdc dung thdng gid de ttanh hign tugng vdn cue, ban chg sg phat ttien ciia vi sinh vdt, \a ttanh duge su tdn thdt ttong qua ttinh tdn irH. Khde phuc dugc ylu dilm
Hinh 8: So d l silo dugc thiet k l 5 KETLU4.N
Viec tinh toan va thiet ke cai tidn silo nang sudt ehlia 500 tdn da dugc thue hien dua tten nhung tigu chuan Eurocode. qua trinh thdng gid dugc tinh theo tieu chudn Viet Nam, phii hgp vdi dilu kien khi hdu Viet Nam. Silo tiiiet kl vdi muc dieh sur dung de bao qudn vd tdn trii cam vien phuc vu qua ttinh ttich ly ddu cam. N ^ g n eiiu thigt kl nay giiip eho qud ttinh che tao thilt bi silo ttong nude dugc thyrc hien dl dang, gdp phdn cho vigc phdt triln vd sii dung thiet bi vd cdi^ nghe trong nude, gidm chi phi ddu tu gdn 1 ty ddng so vdi thilt bi ngoai nhdp.
Vdi he thdng thdng ^ d , silo dugc thilt kl khdc phue dugc nguyen nhdn ddn din hu hdng va lam gidm chdt lugng cam vign trudc khi ttich ly ddu, tdng hieu qua ciia qua trinh bao qudn va ttich ly ddu cam.
Tgp chi Khoa hpc Tntang Dgi hpc Can Tha L d i CAM TA
Xin ehdn thdnh cam an edc anh ehi trong Cdng ty Trich ly ddu cam Cdn Tho da giiip dd. tgo didu kign t h u ^ lgi cho chiing tdi tham quan, khao sdt vd hoan thanh nghien cim ndy.
TAI L i f u THAM KHAO
1. Bili Song Cdu, 2003. Nghidn ciiu thilt kl, chg tgo he thdng silo bao qudn edc hat ndng sdn xudt khdu qui md 200 -^ 300 tdn. Hgi thdo "nghien cdu cdng nghg va silo bdo qudn eac ndng sdn xudt khdu", Dai hgc Bach Khoa Thanh phd Hd Chi Minh.
2. Escoe. A- Keith, 1986. Mechanical design of process systems - Volume 1: Piping and Pressure Vessels. Gulf Publishing Company, Houston, Texas. 324 pp.
3. Eurocode 1- Actions on strucmres- Part 4:Silo and tanks.
4. Hodng Dinh Tin, Biii Hdi, 2004. Nhigt ddng hgc kJ thudt vd truyen nhiet, Nha xudt ban Dai hge Qude gia Thanh phd Hd Chi Minh.
5. Hongyu Li, 1994. Analysis of steel silo structure on discrete supports, Department of Civil Engineering & Building Science The University of Edinburgh Edinbui^, Seotiand, UK.
Phdn A • Khoa hgc Tu nhien. Cong nghe vd Moi mrdng: 30 (2014): 30-38 6. Jesper Knijnenburg, 2008. Influence of
vibrations on particle flow behavior. Master Thesis - CH3901. Institute of Building Engineering, Wroclaw University of Technology, Poland.
7. Nguyen Hoai Tan, 2013. Thilt kl silo chiia cam vign 500 tdn phue vu trich ly ddu. Ludn vdn Thac sT, DH Bach Khoa TPHCM, 06/2013.
8. NguyenTudngLongvac/V., 2010. Xdy dung chucmg trinh tinh todn silo dimg APDL va Visual Basic. Joumal of Science
& Technology Development, Vol 13, N0.K5, 28-40.
9. U.S. Grain Council, 2012. Grain Inventory and Silo Management. Technical Seminar, Ho Chi Minh City, 12/2012.
10. Wong Hong Wu, 1990. Static and Dynamic Analysis of the flow of bulk Materials Through Silos. University of WoUongong, Australia.
11. www.wilmar-agro.com.vn/san-pham/dau- cam-gao/dau-chiet-xuat-m-cam-gao-nguon- thuc-pham-chuc-nang-moi.aspx, truy cap ngay 02/06/2013.
