KHOA HOC CONG NGHE
MQT SO KET QUA NGHIEN CUt DONG CHAY TRONG BE HUT, BUONG HUT TRAM BOM NHU^QUi NH QUA MO PHONG BANG PHAN MEM FLUENT VA DE XUAT GIAI PHAP C i l TAO BE HUT
BUONG HUT TRAM BOM NHlT QUYNH '
Dmh Anh Tuan, Pham Vin Thu, Pham Song Hiing, Nguyen Hong Long Viin Bam vd Thiit bi Thuy lgi Tdm « t : rrow bam Nhu Quynh tdn tgi mot sd nhugc diim vi thtiy luc bi htit, budng htit. Bdi bdo m'/'ith bay mgt sd kel qua nghien cuu ddng chdy bi hut. budng tiin md hinh loan Fluent. Tudddi xuat giai phap cdi Igo bi hut, budng hit trgm bam Nhu Quynh di tram bam vgn hdnh tdt
FLUENT. ^*"^ '^ *""''* ''"' ''' *"'' ''^"^ "'^ '"^"^ * " ' *^' *"'' "<"" '"^ ^'"' ^''y"''-
Summary: TTie Nhu Quynh pumping station exists some hydraulic disadvantages of Ihe inlet tank This document presents some research results of the water flowing in the inlet tank in a
^otnputational fluid dynamics software. Fluent Therefore a solutions is suggested to improve Ihe inlet tank of the Nhu Quynh pumping station to make il operate better and stabler
1. Di^T VAN Bt
Trgm bom Nhu Quynh la rapt ti-gm bom Idn tgo nguin nudc do ii, phye vy cho sin xuit ndng ngWf p cfla cie tinh Bic Ninh, Hung Ydn vd tfidnh phi Hd Npi. Tram bam mdi dupc xdy dyng frong phgm vi mfit bdng frgm bom cfi vdi 4 tl mdy bam cd cdng suit dpng ca 260 kW, luu lupng bom 12.600 m3/h, hodn tfidnh dua vdo vfin hdnh ndm 2007. Trong qud frinh vfin hdnh, sft dyng trgm bom khdng ddm bdo ydu cau ky thufit, mdy bom thudng xuydn bj ngit khdng vfin hdnh dupe. Nguydn nhan thfty cdng chfl ylu dupc xde djnh:
Trgm bom bo tri theo tuyin vudng gdc vdi kenh hftt ndn dnh hudng din chit lupng ddng chdy tft kdnh hut vdo bl hftt;
- Be hut nhd hpp, khdng cd dogn chuyin tilp gifia buong hflt vi bl hflt;
Ngdy nhfin bii: 11/10/2016
Ngdy Uiong qua phan bifn: 28/11/2016 Ngdy duydt ding: 28/12/2016
Tudng cdnh b l tri thing dftng khdng thugn cho ddng chdy vdo buong hftt (thudng Id gdc 45");
- Kdnh dan vi lin chilm mfit cit thu hpp, tilt difn udt nhd v i boi ling nhilu gdy tin thit cycbp;
BuIng hftt tfiilt kl khdng hpp Iy, tfil tt'eh buIng hut bd, do cd 1 dogn die sit mifng hut cfla raiy bom, gd die niy gay ra xio frpn ddng chiy vao bora.
De tii dd tiln hdrfli ngWen cftu cdc gidi phdp edng hinh nhfim dilu ehinh ddng chdy vdo bl hut, buong hut dupc tiiuan ddng dl frgm bam vfin hdnh In djnh.
2. PHU'ONG PHAP NGHlfeN CtTU Sft dyng md htoh toan FLUENT dl md phdng ddng chiy frong bl hut, buIng hut frgm bom Nhu Quynh frong dilu kifn Ufn trgng vi khi cd cic giii phip cdng frinh tft dd lya chpn giii phip cdng trinh phft hpp.
Phgm vi ngUdn cftu fr«n md htoh dupe fliidt % :
TAP CHI KHOA HOC VA CONG NGHE T H O Y LOI sfl 36 - 2016 67
-"^"
KHOA HOC CONG NGHE
- Mien tinh tinh tft hidi chdn ric phia thupng luu tdi hidi chin rdc pWa ha hm;
Trgm bora Nhu quynh cu: 8 may bom vdi luu hrpng moi may Q = 6000 m3 h:
Tram bom nhu quynh mdi: 4 may bam vdi luu lupng moi miy Q = 12.600 m3 h;
- So lipu bao gdm dia hiifli \ a tWet kd chi tilt bd hut, budng hut trudc \ a sau cii tao.
3. KET QUA NGHE&N ClTU VA THAO LUAN DONG CHAY CUA Bt HUT TRAM BOM NHU" QUYNH
3.1. Be hiit tnrdc khi cil t^o
a) Tnr&ng hgp cd tigm bam cd va tifm bom mdi cdng hogt dgng
•IWIMM
UA
Htnh I. Kenh hia vd be hul trgm bam Nhu Qirynh
Hinh 4: Hinh dnh ddng chdy lap nudc be mgt
IH
Hinh 2: Dja hinh. vi tri biin thiet lgp cho
nghien cuu bi hut Hinh 5: Hinh dnh dong chdy Idp giua
m ^
m
Minh .i- Mat cdt ngang trgm bam Nhu Quynh Hinh 6: Hinh dnh ddng chdy Idp ddy
« ^^O^'KHOAH0CVACflNGNGH?THUYLO,s036-20,6
KHOA HOC CONG NGH6 b) Trudng hgp chi cd trgm bgm mdi
hogt dpng
»i 1
!
i
Hinh 7: Hmh dnh ddng chdy Idp nudc bi mat
-=^0^
Hinh 8: Hinh dnh ddng chdy lap giita
.t^
- Ddng chiy d cic Idp giira chu ylu vdo nhdm ba bdn miy ngoai cimg cfla trgm bom cu cd van tdc rat Idn;
Tao ra vung xody qudn pUa trudc ba may trong cflng cua trgm bora cu;
- Ddng chdy vdo trara bora mdi vdi tdc dp nhd, khdng ddi xirng bi lech vd bd hiiu nUn vd thupng luu.
Trudng hgp chi mdi trgm bam mai ciing hogt ddng:
- Ddng chdy Idp bd mat va ldp day phftc tgp, khdng dn djnh, tuy nUen t.dt ban so vdi trudng hpp ehgy ddng thdi ca hai trgm;
- Ddng chay vao bd hut trgm bam mdi khdng ddi xftng lech vd bd huu nhto vl thupng luu;
- Ddng chdy d cdc ldp gifta chu ylu bi tang tdc d ngodi, vdo khd thudn hai may gifta cua tram bam mdi;
Ddng chay vdo td mdy hai ddu tram bam khdng thuan;
Tgo ra vflng xody quin phia tnrdc td may bom hai ddu tram bom.
3.2. Cic giii phip cdng trinh cii tao be hut a) Phucmg an 1: Ldp 3 tdm hudng dong deu nhau tgi bi hdt
Hinh 9: Hinh dnh ddng chdy lap ddy
c) Nhgn xet, phin tich vl kit qui md phdng ddng chiy bl hut tnrdc khi cii tao
* Tntdng hgp cd trgm bam cu vd trgm bam mai cimg hogt dgng:
Ddng chdy ldp be ragt vd Idp day phuc tap,
khdng dn djnh; Hinh 10: Mat bdng ldp ddt 3 tam hudng ddng deu nhau tgi be hut
TAP CH( KHOA HOC VA C O N G NGH? T H O Y LOl Sfl 36 - 2016 69
KHOA HOC CONG NGHE
I
Hinh 11: Hinh dnh ddng chdy ldp bi mat
fT
fe-_.
Hinh 15: Hinh dnh ddng chdy lap mgt
Hinh 12: Hinh dnh ddng chdy lap giira
'%
'%~ f
Hinh 16: Hinh dnh ddng chdy lap giira
Hinh 13: Hinh dnh ddng chdy Idp ddy ^'"^ ' '^' ^ ' " ^ ' ' " ' ' '^°^S ^^^V ldp day b) Phutmg dn 2: Lip 4 tim hudng ddng d ''^ ^'"^'^8 ^n 3: Lip 3 tim hudng ddng d ngodi kenh hut chdo gdc 45° so vdi bd hut ngo^« kdnh hut cheo gdc 45° so vdi bl hiit va
keo dai theo ddng chay vao budng hut
i ^^LM.
- - "- • ' 1 ^
Hinh 14: Mat bdng ldp dgt 4 tdm hudng ddng c ngoai kinh hdt cheo gdc 45" so vdi bihtit
Hinh 18: Mgt bang ldp ddt 3 tam hudng ddng d ngodi kinh hut cheo gdc 45° so vdi bi hut vd
keo ddi theo ddng chdy vdo budng hut
TAPCHI KHOA HOCVACflNG NGH? T H U Y L O I Sfl 36-2016
KHOA HOC CONG NGHE
Hinh 19: Hinh dnh ddng chdy Idp be mat
% i,
Hinh 20: Hinh dnh ddng chdy Idp giua
d) Nh|n xdt, phan tich ket qui md phong ddng chiy bl hdt sau khi cii t^o
• Phuang an I: L^ 3 tdm hudng ddng diu nhau tgi bi hut
Bbag chay Idp bd mfit va Idp diy vio budng hftt cfla 4 Id miy vln khmig In djnh, xuit Upn xoiy ngay diu vio budng hut do ddng chiy bi lech lAia bd hira nhto v l jAia tiiupng luu.
* Phuang dn 2: Ldp 4 tdm hudng ddng d ngodi kenh hut cheo gdc 45° so vdi bi hid
Dwig chiy d diu vao cdc tim hudng ddng khi tot, tuy nUai ddng chiy ra khdi tam hudng ddng vln bj rdi, chua tot;
- Drag chiy vao buong hftt td so 4 bj Ifch bin vd tuong canh bl hftt pUa ha luu.
Phuang dn 3: Ldp 3 ldm hudng ddng d ngodi kinh hut cheo gdc 45° so vdi bi hut vd keo ddi theo ddng chdy vdo budng htit - Hipu qui cua tim hudng ddng rd ipt;
- Dong c h ^ hicmg ddi In (finh, ddng diay <fi phan bd dwng da deu d » ci 4 budng hut cua ttgm bom.
4. Ktr QUA NGHIEN CUtJ VA THAO
LUAN D 6 N G CHAY CUA B U 6 N G HUT
TRAM BOM NHir QUtNH 4.1. Bnong hut tnrdc khi cii tao
CAT DQC BUdNG H ( J n w 6 c CAl TAO
^ no kV
C ^'
MATBANGBUOHGMJTTIIUtiCCAiTAO
Hmh 21: Cdt doc. mdt bdng budng hut tiudc khi cat tao
TAPCrtKHOAH0CVAC0NGNGt«THjYL0ISfl36-
2016 71
KHOA HOC CONG NGHE
Hinh 22: Hinh dnh cdt dgc ddng chdy budng hut trudc cdi tgo
N h ^ xdt, phin tich kit qui md phdng ddng chiy bning hftt tnrdc khi cii tgo
Tft kit qui md phdng cd sy xuit Ufn cfta xoiy d pUa tudng hg luu cflmg nhu sit gdc bl hflt. Dh khic phye vin dl niy ta lip dfit hidng dgng cinh bim flieo bidn dgng xoiy dh trift tidu xoiy;
- Vfin tic frudc lii vio bom khdng diu, dilu niy din tdi vile giim Wfu suit lim vifc cfla
CATDQCBUdNCHifTSAUdllTAG
Hinh 23: Hinh dnh ddng chdy budng htit tgi mat cdt mieng hdt
bom. Dl khic phye vin dl ndy lip flidm 1 chdp hudng ddng vdo mifng Ing hflt;
- Xuit Ufn xoiy d pUa vio buIng hftt do phin vit gdy ra vflng ddt md, ddng chdy dli hudng hvdc kU di vdo bom. Giii quylt cic vin dl niy lip cie tim hudng ddng buIng hflt.
Gidi phdp cii tgo buIng hut cy flil nhu sau:
4.2. BuIng hut sau khi cii t^o
MAT BANG B U O N G HOT SAU CAI TAO
Hinh 24: Cdt doc. mdt bdng budng hut sau khi cdi Igo
n TAPCHlKHOAH<pCVACONGNGH?TH0YLaSfl36-2016
I KHOA HOC" CONG NGHE
Htnh 25: Cdt dgc hinh dnh ddng chdy budng
hut sau khi cdi Igo Hinh 26
Hinh 26: Hinh dnh 3D ddng chdy budng hul sau khi cdi tgo S.Ki.TU5^
Tu klt^qui tinh toan md phdng ddng chiy ti-ong be hflt, buong hftt frgm bom Nhu Q u ^ tiudc vi sau cii tgo frdn md htoh toin Fluent, dd dinh gii dupc Ufu qud cfta tiing gidi phip cong frtoh de cii fliifn chit Iupng ddng chiy d be hut vd buong hftt cfta frgm bom ndy. Kit qud tinh todn vdi nUeu phuang dn cdi tgo ^ chpn dupc gidi phdp Ufu qud nhit dd Id:
* Dli vdi bl hftt:
Ldp 3 dm hudng ddng d ngodi kdnh hftt chdo gdc 45 so vdi be hftt vi kdo dii flieo ddng chiy vio buIng hftt (phuong in 3), ey flil:
TAI U f u THAM KHAO
Dinh Anh Tuin v i mA, dl tdi d^ Ifip eip Nhd nudc: "NgUdn cftu, tinh toin, fliiit kl buIng hftt, bl hut de cai tgo vi nfing cao Ufu qui hogt dpng cfta hf flilng cic frgm bom vfta vi Id^" V i ^ Bom vi TUlt bj Thfly Ipi tfiyc Ufn nim 2012-2016. «wn oom vua vi Idn , Vifn - Tim 1: bin kinh cong R = 1,6 m, kfch tfiudc (lxh):6x2,5(m)
Tim 2: ban kinh cong R = 1,6 m, kfch fliudc (lxh):9x2,5(m)
Tim 3: bin kinh eong R = 1,6 m, kfch fliudc (beh): 12 X 2,5 (m).
* Doi vdi buong hut:
- Bd sung hjdng bidn hg luu dgng W&i ddng chiy;
- Lip chdp hudng ddng diu mifng hftt;
- Lip cic tim hudng ddng buIng hftt
TAP CH( KHOA HOC VA CONG NGH? T H O Y LOI sfl 36 - 2016
