Vii Nam Ngan' 'Trudng Dai hpc Md - Dia chat ^Trudng B ^ hpc Bioh Khoa Hi Npi TOM TAT Ly thuyet tinh todn, thiet ke mdy bom chiu mdi mdn cao phy£ vu thdi tro xi cho cdc nha mdy nhiet di
Trang 1NGHIEN CO'U-TRAODdi
MOT S6 DAC DliWI T I N H T O A N , THiiT K i BANH CONG TAC
BOM LY TAM VAN CHUYfiN CHAT THAI RAN
TRONG CAC NHA MAY NHIET DIEN
SOME CHARACTERISTICS OF CACULATION, DESIGN THE IMPELLER OF
SOLID WASTE CENTRIFUGAL PUMPS IN THERMAL POWER PLANTS w,
* ThS Bui Minh Hoang', GS,TS Nguyin ThS Mjch', PGS.TS Vii Nam Ngan'
'Trudng Dai hpc Md - Dia chat
^Trudng B ^ hpc Bioh Khoa Hi Npi
TOM TAT
Ly thuyet tinh todn, thiet ke mdy bom chiu mdi mdn cao phy£ vu thdi tro xi cho cdc nha mdy nhiet dien vd khai thdc mo, van chuyin bun cdt Gdn lien v&i quy lu^t ddng chay cua cdc dong chat long hdipha trong phdn ddn dong mdy bam Dong thai, xdc dinh dua tren cdc quy luat chung ciia
ca hoc cdc hon hap ran - long Trang thuc te, de thiet ke che tgo thdnh cong mot may bcmi chiu mdi mon cao phuc vu thdi tro xi ciing nhu van chuyen imn cat, phdi ket hap chgt chegiica ly thuyet tinh toan thiet ke vd tien hdnh thu nghiem bam vai nhieu yeu to dnh huong khdc nhau Bgc biet doi vai phdn ddn dong cua bam vd vdn de vdt lieu che tgo mdy bam
Bam ly tdm van chuyen chdt thdi rdn trong cdc nhd mdy nhiet dien can phdi co dien tich luu thong rgng de co thi cho qua cdc hgt rdn Idch thuac lan Bai vgy, kit cau cua bam co nhiiu diem khdc biet so vol ket cdu cua bam nuac thong thuang
Tft khoa: Bam dong hon hgp hai pha rdn - long, bam thdi xi, bom mo hinh
ABSTRACT
Theory of calculation, design the high wear-resistant pumps serving transport ash in thermal power plants, mining With the law of the flow of two-phase fluid flowing in the pumps Also to be determined based on the general rule of mixtures of solid and liquid In fact, to desigtl and manufacture a high wear-resistant pumps, we must closely combine the theoretical design calculations and conducted experiments the pumps with many different factor Especially for the' diversion of pump and materials
area to be able to pass large-sized solid particles Therefore the structure of the pump has many Centrifugal pumps transport solid waste in thermal power plants requiring large circulation -ences compared to the normal water pump ' —&'- "tit." Jifiiu puriicit
differences compared to the normal water pump
Keywords: Two-phase flow pump, mixed solid - liquid pump, pump model
TAP CHf CO KHf VItT NAM, Sd 1+2 nam 2017
Trang 2NGHIEN CU'U-TR/\0;:;Oi
1 G i m THIEU
Banh c6ng tac la bp phSn quan trpng,
ca ban nhat cua may borm noi chung va may
bom thai tro xi noi rieng, no lam nhiem vii biSn
doi CO nang trSn true quay th^nh nang lircmg
ciia dong chat luu, ket cau banh cong tdc dong
vai tro chu dao trong ket can may bom Bai
vay, banh cong tac quyet dinh kit cdu cua may
bom Voi may bom ddng hSn hpp hai pha r&i
- long noi rieng, cac thSng s6 vi kSt ciu ciia
banh cong tac da co nhieu nghien ciiu khi xem
xet anh huong ciia chiing dSn tinh nang, hieu
qua lam viec va dS mai mon ciia bam
2 CO sd TINH TOAN, THIET KE BOM
DONG HON HOP HAI PHA RAN - LONG
Khi thiet k§ banh cong tdc bom dong hon
hpp hai pha rSn - long, duong kinh v^o (D^)
ciia bom va duong kinh mep vao (D,) cua canh
dupe xdc dinh tuong tu nhu bam nuoc thSng
tiiucmg, tuy nhien, chieu rpng mep vao (b,)
xac dinh khac vai bom nuac thdng thuang Do
chieu rpng mep vao ciia banh c6ng tdc bang
chieu rdng mep ra (b^), hon niia, chiSu rpng
mep ra lai co y nghia quySt dinh Do do, khi
thiet ke thudng xac dinh tnrdc chieu rdng mep
ra canh, sau do lay chidu rdng mep vao bang
chidu rpng mdp ra (b, = bJ [2] Chidu rdng
mep ra b^ dugc xac dinh theo cdng thure thuc
nghiem:
b^=K,^4Qhi (1)
Trong d6, he sd K^^ dugc chpn phu thudc
vao so canh ciia banh cdng tdc [1];
- Bdnh cong tac 2 canh: K^2 >2,2;
- Banh cdng tac 3 cdnh: K^^ = 1^9 ^ 2,2;
- Bmh cdng tac cd sd cdnh nhieu hon 4;
Sau khi xdc dinh dugc chidu rdng b^, ta
xdc dinh lai van tdc dong vao C^j,0, van tdc
trudc khi vao Id canh C^j va goc dat canh df cua vao pj Ddi vdi bom ddng hdn hgp hai pha ran - Idng, gdc dat canh d cira vao thuotig cd gia tri pj-28M0'' Gdc va Ap cd gia tri trong khoang rdng hem so vdi bom nuac thdng thuong Ap=3''-20° [3]
Gdc dat cdnh d cura ra p^ ciia bom cd gid
tri trong khoang ^=\T^35° [3] Dd dam bao
gia tri nay cua gdc P^ can tinh dudng kinh ra D^
cua cdnh banh cong tac theo gdc p^ theo quan
he sau:
^IS ^sH, (2)
Trong do;
U^- Vdn tdc vdng (van tdc theo) d ciia ra cua banh cdng tac;
C^- Vdn tdc kinh tuyen d cua ra cua
banh cdng tac;
g- Gia tdc roi tu do;
H,^- Cdt ap ly thuyet cua bom:
H,rH//ii„;
i\ - Hieu suat thuy luc cua bom
Khi xdc dinh dugc cdc kich thudc la canh
d mep vao va ra can xac dinh lai he sd chen ddng K, va K^ va xdc djnh lai gdc dat cdnh Sd
Id canh it se c6 anh hudng dang kd tdi cot ap
Bdi vay, can tinh dnh hudng ciia sd cdnh huu han tdi cot dp ciia bam
Tinh tdi anh hudng cua sd cdnh hiiu han cdt dp thuc se cd gid tri bdng [1]:
H = %Y^V,C^=r,„£U,C^, (3)
Trong dd:
p - He s6 ke tdi inh hvrdng cua s6 canh hiiu han duoc xac dinh theo cong thilc cua Phlayderc: 3
ISSN 0866 - 7056 TAP CHf CO KHf V I £ T NAM, S6 1+2 nam 2017
Trang 3JGHIEN CLfU-TRAOB6I
iv
z \-(R,IR2Y
(4)
>i; = (0,55 +0,68)+ 0,6sinP2;
Z - S6 li oinh cua binh cong tac;
R, E^ - Bin kinh d cila vao va cto ra ciia
;inh cong tic;
s - He s6 ki tdi inh hudng cila so cinh
lifti han xic djnh theo cong thilc cua Stadola:
C - Vin tdc xoiy (van toe tuySt ddi
chieu theo phuong van tdc vdng) d cila ra cinh
cong tic
B I dim bio c6t ip thuc H cila bom vi
giii gdc ra Pj khdng ddi cin phai thay doi dudng
kinh d cto ra Dj cua cinh cdng tic Viec tinh
toan duac tito hanh tdi khi sai sd dudng kinh
Dj trong hai lin tinh k6 nhau sai khac khong
qua 3 +5% [1]:
AO, = ^ ' ^ ' < 3 + 5% (6)
Dj - Dudng kinh cto ra ciia la canh trong
lin tinh toin trudc;
D^' - Dudng kinh cto ra cto li cinh
trong lan tinh toin ke sau
3 KET QUA TINH T O A N T H I E T Kfi BOM THAI XI M 6 HINH
Dva trSn mot sd luan diSm da neu, tac gia da tmh toin thiSt k6 binh cdng tic cua bom van tii xi trong nha may nhi6t diSn te6n co sd bom nude sach, vdi cac thdng sd diu vio nhii sau;
Cdng suit dong co di?n; N^ = 55 (kW);
Sd vdng quay: n = 1450 (v/ph);
Hi6u suit dong ca difn d chS d§ djnh miic; n^T 0,89;
Cot ip thiet ke cto miy bom: n^= 57
(mH,0);
Luu lugmg tinh toin: 0^= 185 (m'/h);
Hi6u suit chung sa bg cto bom: \^=
0,65
Ndng dp thi tich cto xi trong hdn hgp:
C^= 30% (thvc t8 C^<40%) [3];
Khdi luong riSng cto xi than; Pj= 750 (kg/m');
Kich thudc hat trung bmh: d^^- 50
(mm) , Nhu viy, trong qua trhih tinh toin liy
khdi lucmg hdn hgp (nude - tro xi) theo quan
he [3];'
Cv
Yhh-Yh-Yn
Tvr dd xic dinh: p^= 925 (kg/m')
KSt qui tinh toin ly thuySt, nhan dugc mdt s6 miu cinh bam md hinh nhu sau:
T h d n g so m S u c a n h
S6 v o n g q u a y d a c t n m g n , (.v/ph')
D u f m g kinii b a n h c o n g t a c D (mni)
G 6 c d a t c&oli (°)
C l i i ^ rOng n i n h b a n h c o n g t a c
S o tk c d n h b a n h c 6 n g t a c Z
C h i S u d a y la c a n h Stjnm')
M l u 0 1 - B X - 1
5 9 , 5
D l = 1 4 0 ; D2 = 4 0 0
ft = 2 8 ° ;
ft = 3 0 °
bl = f)2 = 6 0
4
15
M 5 U 0 2 - B X - 2
5 9 , 5
D l = 1 4 0 ;
D , = 4 0 0
ft = 2 8 ° ;
ft = 3 4 °
i l = b2 = 6 0
5
15
M a u 0 3 - BX-3
5 9 , 5 H
D l = 1 4 0 ;
D , = 3 8 0 !
ft = 2 8 " ;
ft = 3 0 ° ,
>J1
i l = i 2 = 6 0
5
15
ISSN 0866-7056
TAP CHf CO KHt VIET NAM, Sd 1+2 nam 2017
Trang 4NGHIEN CLFU-TR/
Ddi vdi bom thai xi cd n^ = 59,5<100, Id canh banh cdng tdc cd dgng mat tr^i cong theo mpt chieu dgn gian [L] Vi vay, chi can xay dung bidn dang cua mpt dudng ddng trung binh cua chieu
' ^ ^ i g canh bdnh cdng tac la dugc Cdc Id canh vudng gdc vai cdc dia bdnh cdng tdc, hinh chieu ciia
cac Id cdnh bdnh cdng tdc tr$n mat phang vi tuyen chi Id mOt dudmg cong
De thudn ti^n cho viec xay dung bien dang cdnh cua bom md hinh, ta chpn phuang phdp xay dung bien dimg canh bang phucmg phdp tich phan hinh hoc
K§t qua tinh toan dugc trinh bay cu thd tai cdc bdng 1,2 va 3
Bdng 1 Kit qud tinh todn xdy d{mg cdnh bdnh cong tdc BX-1 bdng phucmg phdp diem:
9
10
' i
»
007
0.08}
0 1 0 9
«m
o.us
0-I4S
Oltil
0.174
0 2
- ¥
a
0.110
D-1S1
0192
0.2»
025}
OJM
^
m
0-OlS
0.015
OOIS
0-015
0.01S
0.01S
o.eis
ti
0.136
0.100
0-078
ao65
aos9
O J K I
a W 8
c„
m'l 3J83
2.S49
2J15
1.7U
1.3U
0712
w,
n ' t 10.166 9.307
7.SSi
1728
5.009
3J90
1.S71
0 333
0335
0 337
0340
0J49
0 355
0365
0 403
0453
d " * ,
0 4 6 9
0-437
0422 0-420
0.4»
0-434
0.501
P
«
27.996
25-911
24.994
24.S4«
25.714
30,079
t A
0.531
0.486
0466
0.463 D.463 0.481
0.579
"•i-tSft
26.SS9
2 J J M 6 21.454 19J7S I7J9J 1&022 14.601
U.94I
I 0 L « 7 S.SI8
2
0 25.402
20.416 I8.4E6
16 807
15 311 13,933
I L 2 »
H - g ! ^
^ 0
18921 35-818
« 7 M
88.717
108.483
123 JW6
Bdng 2 Kit qud tinh todn xdy dung cdnh hdnh cong tdc BX-2 bdng phucmg phdp diem:
9
^i
•
0,07
0,083
0 ^
9.VS
o.ia
0,135
O.ICI
0,1S7
"-^
WI
0.(»g
o.tot
0.121
0,153
0,IEe
0.»2
0,219
^i
H
0,DOd
0.006
0.00fi
0,006
0^006
St
ti
0,D6S
0,050 0.»H
0.0J5 0,032
o,a»
0,02?
t v
mfi
3^8) 3,109
2.S62
2.015 1,742
1.1M 0,921
%
»^
8,436 7,713
0,263
SM6
4.123
•1,101 3,378
1,933
ct«)i
0.403 (^406 0,409
0.418 0.425
0.450
smfi,
0,469 0,461 0.455
0.432
0.457
0L477 0.S02
A
«
27,»S 27.444
26,923 26,876
37,206
n.«5 28,»1 30,145
tg»,
0,531
0,512
0 ^ 0,507
0,514
0,543
n-wft
26,886
20364
16.183
13,ISI 11.850
9,214
2
0 2S.0S0 2I.7K 19.220
1SJ77 13.861 12,501 1U16 9.898
, | ^
« 0 18,658
49.203 6I.K2
83,740 93.051 101.405 108,778
Bdng 3 Kit qud tinh todn xdy dung cdnh bdnh cong tdc BX-3 bang phucmg phdp diem:
n
M
0,07
o,on
i>,a9d
9,196
ll;IIt
0,13
01142
0,166
0,171
0,19
lar
R
4.«n
0.103
cut
D,14S
0.1S3
am
0,193
0,20t
0.224
Sl
»
o.ooe
0,00€
0,0M
D.OM
D,00«
0.006
e.06t 0^031
^031
e,wo
0.037
0 , « 1 0.029
e,»25
f*
m/i
3.383
2,ta
2,572
^«32 1,762
I.I2:
0,952
V,
mt'i
1,436
7,035
3,635
4,234
2,833
1 U 3
0.401
0.404
0,4)9 0.412
0.422
0.446
sad,
0;469
9^455
0.449 0.4*9 0,430
0.460
OlSOl
A
»
27,998
27,078 2^836
26,667
26,964
28,242 30,0«
tgPi
0,331
0,311
0,503
0.30*
0,518
0,579
Ti-ttft
2^886
a,«8
20,828
16^861
13,983
11,629
ifiK
2
0 25,192 2^163
17.762 1(^093 14l654 13^377
U 2 M
9,781
' • - | ^
« 0 17.321
44135
69.J11
tt.tsi
9^073 104,«6S lll.SW
ISSN 0866 - 7056
TAP CHI CO KHi VI$T NAM, Sd 1+2 nam 2017
Trang 5NGHIEN CCrU - TRAO D 6 |
Til kit qua tmh toan cho cac mlu canh bdnh cong tac dugc trinh bay tren cac bang 1,2,3 ta xay dvng dupe bien dang va kit cku eia timg loai banh eong tae ttrong ling thS hiSn trSn cac hiuli
1,2, 3,4,5 va 6
Hinh 1 Mgt cat klnh tuyin ciig BCTmdu BX-1 Hinh 2 Mat cat vl tuyin cua BCTmdu BX-1
il
i
Hinh 3 Mgt cdt kinh tuyin BCT mdu BX-2 Hinh 4 Mat cdt vjmyin cua BCTmdu BX-2
Hmh 5 Mat cdt kinh tuyin BCTmdu BX-3
Hinh 6 Mat cdt vi tuyen ciia BCTmdu BX-3
ISSN 0866-7056
H TAP CHf CO KHf VIET NAM, Sa 1+2 nam 2017
Trang 6NGHIEN CU'U - TRAO DOi
4 K E T L U i ^
Ket qiia cac cdng trinh nghien curu vd
mdy bom ly tam dung cho ddng hdn hgp ran
-Long ciia cac nha nghien cuu, cho thdy:
+ May bom ly tam lam viec trong mdi
tnxdng hon hgp 2 pha ran - Long tuong ddi
phuc tap Trong qua trinh lam viec, tfnh nang,
hieu qud lam viec, do mai mdn cua may bom
chiu anh hudng tong hgp bdi tinh chdt hdn hgp
v | n chuydn va cac thdng s6 vd hinh 6ang, kdt
clu va didu kien van hanh cua may bom
+ \^dc nghien cuu, thidt kd may bom ly
tam dung cho ddng hdn h c ^ 2 pha r§n - Long
ve CO bdn van phai dua vao Iy thuydt tinh toan
thiet ke may bom nude sach dd dp dung tinh
toan thiet ke cho mdy bom ddng hdn hop 2 pha
ran - long Trong qua trinh tinh todn thidt kd,
nhirng anh hudng va tdc ddng cua ddng hdn
hgp ran - Idng va cac tiidng sd vd hinh dang,
ket cau toi tmh nang, hieu qua lam viec va khd
nang chiu mai mdn cua may bom dugc xem
xet de dieu chinh trong vice thidt kd may bom
+ "N^ec tinh todn lua chgn cac thdng sd
hinh dang, kdt cau va che do lam viec cua may
bom phii hgp vdi mdi loai hdn hop nhat dinh
(dugc dac trung bdng cac flidng s6; Cv,dh,yh )
n h i m hEua chd tdn thit dp sudt, hieu sudt lam vide cua bom, gidm b ^ do hao mdn hu hdng cua cdc chi t i i t
Tren co sd ly thuyet tinh todn thidt ke may b o m nuorc s^ch kdt hgp vdi cdc dac trung ndi rieng cua bom ddng hdn hgp hai pha ran -Idng, tdc gia da dua ra dugc 03 mSu bdnh cdng tac phuc vu cdng tac khdo sat cac dac tinh sau nay.»>
Ngay nhan bai: 22/01/2017 Ngay phan bien: 20/02/2017
Tai li@u tham khao:
[1] Le Danh Lien; Bam, quat cdnh ddn, Trudng
Dai hoc Bach khoa Ha Noi, 2 0 n [2] Le Danh Lien, Nguygn Van Bay, D6 Huy
Cuong; Mot so dgc diem tinh todn thiet ki bdnh
cong tdc vd lyuSng xoan bam ly tdm van chuyin hon hap nude vm ligt rdn kich thu&c lan, Hpi nghi
Khoa hpc ''Ca hpc Thuy khi toan qudc nam 2003"
[3] Vu Nam Ngan; May va thiat bj thuy khi v§n chuyen dong h6n hgp ran - long, Trudng Dai hpc
Mo - Dia chdt, 2012
[4] Karelin V la; Su mdi mon trong bom cdnh dan
Moscava, NXB Ch6 tao May (1978)
ISSN 0866 - 7056
TAP CHI CO KHI VIETNAM, Sd l + 2 n a m 2017