Dao Hflu Manh Viln Nghien cflu Co khi, Bd Cdng Thfldng Bdi bdo gidi thieu tdm tdt cdng dung, tinh ndng, nguyen ly hogt ddng cd bdn ciia bd say khdng khi hoi nhiet kieu quay, mdt cum thi
Trang 1NGHIEN CU'U-TRAO DOI
\i TiM HI^U VAN OE LOT GIO TRONG BO SAY KHONG KHi H 6 | NHIET KIEU QUAY TRONG NHA MAY NHIET DIEN 0 6 T THAN CONG S U A T 300 - 600 WIW
LEARN ABOUT AIR LEAKAGE IN ROTARY AIR PREHEATER
FOR THE THERMAL POWER PLANT 300 - 600MW
PGS,TS Nguyin Chi Sang, ThS Phan Hfiu Thing, ThS Dao Hflu Manh
Viln Nghien cflu Co khi, Bd Cdng Thfldng
Bdi bdo gidi thieu tdm tdt cdng dung, tinh ndng, nguyen ly hogt ddng cd bdn ciia bd say khdng khi hoi nhiet kieu quay, mdt cum thiit bi quan trgng trong nhd mdy nhiit diin chay than cd cdngsudt tU
300 din 600 MW Khd ndng lot gio trong bg say ndy cd y nghia Idn khdng chi din hiiu sudt cua bd say,
md cdn dnh hUdng quan trong din hieu suat chung ciia cd nhd mdy Ndi dung tinh todn khd ndng lot gid vd cdc kit cdu thiit kitoi Uu, vgt lieu cdng dUdc nghien cUu trong bdi bdo ndy Cdc kit qud nghien cdu da dUdc dp dung tot trong thtfc tetgi Nhd mdy Nhiet dien Than Hdi Phdng
Tfl khda: Tinh todn, thiit ki; Bd say khdng khi hoi nhiet kieu quay; Lgt gid
ABSTRACT
This article summary presents the use, features, basic operating principle of rotary - thermal recovery air heater - important equipment unit in coal-thermal power plants with a capacity of 300 to
600 MW The ability to fall the wind in this heater have great significance not only for the heater's performance, but also an important influence on the performance of the whole plant Calculated content of ability for the failed wind and the optimal structural design, material are also studied in this article The research results have been applied well in actual at Hai Phong coal-thermal power plant
Keywords: Calculation, design; Rotary - thermal recovery air heater; Failed wind
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Trang 2NGHIEN CU'U-TRAO 0 6 l
1 D A T VAN DE 6 BSKK hdi nhiet, trflde tien khdi lam
ndng kim loai rdi sau dd nhilt tich tu tai day v i
Bd siy khdng khi (BSKK) l i thilt bi gia dflpc truyin cho khdng khi Nhfl viy, mdi phan nhiet dUdc sfl dung d cudi dfldng khdi thoit tfl cua bd siy khdng khi se lim viec d t r ^ g thii trong he thong Id hdi cua nha may nhiet diln tiep xuc lin Iflpt khi thi vdi khdi, khi thi vdi ddt than, cd cic chdc n i n g chinh: khdng khi
- Tan dung nhilt cua khdi thoit d l gia
nhiet cho khdng khi cap v i o Id vfla giam nhilt
cua khdi thoit t r i n h ton that, vda cii thiln hieu
suit cua Id hPi v i tilt kiem nhien lieu dung trong
Id hPi Theo tinh toan, n l u nhilt dp khdi thoit
giim dflpc IS^C, thi hieu suit cua Id hdi cd the
ting 1% [1];
- Cai thiln q u i trinh chiy va tang nhiet
dp trong budng dot cua Id hPi, vi khi cap gid
ndng vao se tao ra q u i trinh bit chiy n h i l n lieu
tot hdn, dong thdi lira giam ton that nhiet do
hiln tfldng chay khdng h o i n t o i n cua nhien lieu
tfl dd l i m tang h i l u suit nhilt cua Id hoi;
- Tilt kilm dflpc tieu hao vit lieu va giam
gii t h i n h s i n xuit;
- Sfl dung gid ndng de siy than se thuan
lpi va de dang hdn cho he thong nghiln than
Theo nguyin tic truyin nhiet, bd siy
khdng Idii dflpc chia lim 2 loai: Loai thu nhilt
v i loai hdi nhiet Bp siy khdng khi kilu thu nhiet
li loai dfldc sfl dung rpng rai trong nhflng nam
trflde diy, ve cau tao nd gdm cic kilu nhfl: Kilu
bing t i m thep, kieu bang dng gang, kieu bang
dng thep Uu d i l m chu yeu cua BSKK kilu thu
nhilt l i cd k i t ciu ddn giin de c h i tao, nhflng
nhupc dilm dilm chinh l i kich thfldc v i khdi
Iflpng kim loai c h i tao rat Idn Chinh vi khic
phuc dflpc cic nhupc dilm neu tren, m i BSKK
hoi nhilt Idlu quay hien nay dang dflpc flng dung
tflpng doi pho biln trong cac n h i miy nhiet dien
dot than cd cdng suit Idn
Bd siy khdng khi hdi nhilt kilu quay dfldc md t i tren hinh 1, cd cau tao bdi rotor, trong dd cd chfla cic khdi phan td trao doi nhiet quay lien tuc trong q u i trinh trao ddi nhilt Khdi ndng tfl phia tren di vio bd siy khdng khi di qua cic t i m phin tfl trao doi nhiet xuong phia dfldi
ra ngoii theo dfldng khdi Khdng khi (gid) di tfl dudi di len thdng qua dfldng gio dau vao di v i o
bd siy khdng Idii v i di qua cic ting t i m p h i n tfl tich nhiet cua rotor, gid lanh niy se hap thu nhilt tfl cic tam tich nhiet da cd nhilt dp cao do khdi
l i m ndng lln trflde do, sau dd se di ra qua dudng gid dau ra
Hinh 1 Cdu tgo BSKK hoi nhiet kieu quay
Trong pham vi khudn Idio cua bai bao niy, se t^p trung nghiln cflu cac vin de Ipt gid v i khdi xiy ra trong BSKK hdi nhiet kieu quay
Do d Viet Nam hien nay, chUa cd cic tii lieu tinh toin thilt k l BSKK hdi nhiet kieu quay mpt cich hoan chinh, k l ca cic tii lieu thilt k l chi tilt cic BSKK dang lap dat tai cic nha m i y nhiet dien trong nfldc Tfl cic kit qua khao sit"^
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Trang 3NGHIEN CU'U-TRAODOI
Iiy mau kit hpp vdi vile tham k h i o sfl dung cac
tai lieu tinh toan cua cic tic gii di trUdc, nhdm
d l tai da dfla ra mot trong nhflng dang thiet k l
phu hpp d l c h i tao cac sin pham khio nghiem
nhfl cic khoi phan td trao doi nhilt, t i m chen
kin cac loai dfla vao flng dung lap dat trong
BSKK cua Nha may Nhiet diln Hai Phdng
2 HIEN TUONG LOT G l 6 VA ANH H U 6 N G
CUA LOT GlO TRONG BSKK HOI NHIET
KIEU QUAY
2.1 Cac loai lot gid
Mdt trong nhdng nhfldc diem chu ylu
cua bd siy khdng khi kieu hdi nhiet kilu quay la
Iflpng khdng khi (gid) lot vao trong dfldng khdi
kha Idn, vi theo nguyin ly hoat dpng cua BSKK
kilu quay, ddng gid di qua BSKK ludn cd i p suit
dflpng, cdn ddng khdi di qua BSKK ludn cd ap
suit am Hien tflpng Ipt gid sang khdi se lam anh
hfldng den hieu suit cua BSKK ndi rilng va cua
c i Id hPi ndi chung
Bp say khdng khi ma d l tai Ifla chpn lam
ddi tfldng nghiln cflu thilt k l la loai cd ba ngin
bao gom:
-01 ngan dudng khdi, 01 ngin dfldng gid
cip va 1 ngan dfldng gid cip 2;
- La loai BSKK cd 03 ting trao doi nhiet
bao gom: Ting dau ndng, tang trung gian va tang
lanh;
' Gifla cac ngan: Khdi - Gid cip 1; Gid
cip 1- Gid cip 2; Gid cip 2- Khdi l i cac vung qua
dd (vung nay khdng cd khdi, gid di qua)
Khi bd siy Ididng Idii boat ddng, se cd
hien tUpng lot gid xiy ra Tren hinh 2 la so do cac
kilu lot gid nhu sau:
- Lpt gid trflc tiep: Cic vi tri cd t h i xiy ra lot gid trflc tiep nhfl sau:
+ Tai vi tri Idie hd gifla rotor va vd rotor; + Tai vi tri cac vung q u i dp: Do cd chenh
i p gifla ddng gid cd i p suit dflPng v i ddng khoi
cd ap suit i m n i n cd lpt gid tfl dfldng gid sang dfldng khdi tai cac vdng niy;
- Lpt gid cuon theo: La Iflpng gid lpt keo theo rotor khi nd di qua tfl phia gid den phia khdi va di qua tfl phia khdi d i n phia gid Lflpng gid lpt theo niy phu thudc vao dfldng kinh v i tdc
dp rotor
2.2 Anh hfldng cua lot gid den bo say khdng
khi
Khi xuat hien hien tflpng Ipt gid trong
bd say khdng khi cua Id hoi, thi i n h hfldng nhat cda van de lpt gid se l i m giim hieu suit ddt chiy nhiln lilu cua Id hPi, dan den lim giim cdng suit phat diln chung cua n h i may Ngoii ra, con giy anh hfldng den cic thilt bi khac nhU: Tang diln ning tieu thu cua quat gid v i ting sfl an mdn cda dfldng khdi
Sfl lot khdi v i lpt gid cua bd say khdng khi trong he thdng Id hPi cd the tic ddng ding
k l den tinh nang nhiet cua thilt hi trao ddi nhiet Sfl lpt khdi xiy ra d c i d i u ndng va diu dau lanh cua bd siy khdng khi Hau h i t sfl lot gid xiy ra d dau lanh lam cho sfl an mdn cic be mat lim kin dan den khe hd tang len Ngoai ra, mdt vin d^ quan trpng khac la sfl lpt gid cua bd siy khong khi cd the lim giam nhilt dp khdi vao, ddng thdi cung tang lflu Iflpng gid cua quat gid cap cho BSKK
ISSN 0866 - 7056
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Trang 4NGHIEN c i i u - TRAO OOl
i ( % ) = ( l - j ^ ) x l 0 0 Trong do:
(1)
Htnh 2 Sd do lgt gio, khoi trong BSKK
Bi giim thilu tdn thit ning Iflpng xay
ra do lot gid d vi tri giao nhau gida ddng gid
-khdi thi nhat thilt phai thiet k l va lap dit mdt he
thdng tam chen cd k h i n i n g kilm soit v i giim
thieu sfl lot gid khdi cda BSKK Ylu ciu khi thilt
k l he thdng tam chen c i n dflpc xem xet d i n sfl
dan nd do tang nhiet dp cua ket cau rotor cua
BSKK, vfla d i m b i o mflc dp hieu qua chen kin
dong thdi he thdng chen cd pham vi dieu chinh
dp lpt gid rdng v i thuan lpi trong q u i trinh b i o
dudng, sda chda
Nhfl viy, mdt van d l quan trpng trong
thiet k l BSKK l i lim the nao b i o d i m dflpc that
kin khdng cd lot gid tai cac vi tri cd the xay ra
Day cung la mdt trong nhflng nhiem vu nghiln
cflu khi thiet ke cac BSKK hdi nhiet kieu quay
3 TINH T O A N TY LE LOT GIO VA H l £ U
S U A T L A M VIEC CUA T H I ^ B I [5], [6], 17], [8]
3.1 X i c dinh ti 11 lot gid cua bo say khdng khi
hoi nhilt k i l u quay, L(%)
Mdc dd lpt gid - Khdi cd the dfldc xic
dinh bang nhieu each khic nhau, trong dd, cich
phd bien n h i t l i xic dinh theo ty l l phan tram
cua lUu lupng ddng khdi vao v i ra thiet bi va
dfldc xic dinh theo cdng thfle (1) dfldi d i y
L (%) - Ty 11 phin tram gii tri lot gid;
- Tdng lflu Iflpng khdi vao BSKK, t/h;
V/, - Tong lflu Ifldng khdi ra BSKK, t/h
Mpt each khac cung hay dflpc sfl dung la xic dinh ty 11 lpt gid bang phflong p h i p do ndng
dp dxy tai d i u vao v i diu ra phia ddng khdi cua BSKK dflpc xic dinh theo cdng thfle (2) dfldi diy
L(%): 0 8 9 * ( O , , - O , J
2 1 - 0 ^ , Trong do:
;clO0% (2)
O^^ l i % Ifldng d xy do dupc d phia diu ra; Oj^ la % lupng d xy do dflpc d phia diu vio
3.2 Danh g i i hilu suit lam viec cua thilt hi
De dinh gii hieu suat lam vile cfla thiet
bi, can dUa tren viec xic dinh mpt sd cic chi tilu sau diy
3.2.1 Hieu sudt phia dong khoi cda BSKK
Hieu suit phia ddng khdi la mdt chi sd dung de danh gia tinh trang van h i n h cua bd say khong khi, dUpc xac dinh theo cdng thdc (3) Khi Idia nang say ndng khdng khi (gid) giam se lam giim hieu suit cua bp say Dieu nay ddng nghia vdi viec nhiet dp cua ddng khdi ra khdi bd siy se tang cao va nhilt dp khdng khi (gid) cap vio Id giim di Khi do:
(3)^
ATI ISSN 0866-7056
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Trang 5NGHIEN CU'U-TRAO D 6 |
Trong do;
GSE - Hilu suit phia dUdng khdi cua
BSKK, %;
AT^ - Chenh lech nhiet dp cua khdi, gid
phia dau vao BSKK, "C;
7^, - Ton thit nhilt dp cua khdi vao, ra
BSKK dflpc xic dinh theo cdng thfle (4)
3.2.2 Hieu sudt phia dong gio cda bo sdy khong khi, dddc xac dinh theo cong thUc (7)
Trong do:
T^ - Nhiet do khdi d i u vio cua BSKK, "C;
Tg^ - Nhilt dp khdi dau ra cua BSKK, °C,
khi khdng tinh den sfl lpt gid dflpc xic dinh theo
cdng thfle (5) dfldi diy:
T - J^-K
100 +r; (5)
Trong do:
7; - Nhilt dp khdi d i u ra BSKK, "C;
- Nhiet dp gid d i u v i o BSKK, "C
Thay vio cdng thfle (3), co:
T'-f
Trong do:
ASE - Hieu suit phia dfldng gid cua BSKK, %;
7; - Nhiet dp gid dau ra BSKK, °C;
3.3 Ty 11 ve hieu suit cua BSKK (X)
Gia tri ty 11 X - Phu thudc v i o dp am co trong than, mflc dp lpt gid, ty 11 lflu Iflpng gio
va khdi, dflpc xac dinh theo cdng thdc (8) Ty 11X khdng xac dinh h i l u suit cda bd siy khdng khi, nhflng nd cho biet dflpc tmh trang vin hinh cua bd siy khdng khi Khi gia tri X tang dong nghia vdi viec hilu suit BSKK dang v|n hinh tang v i ngfldc lai
GSE
Kit q u i tinh toan: Vdi cic thdng theo thiet k l cung nhfl cac gii tri do dflpc thfle tl, (6) thay vio cic cdng thfle tren, tinh dflpc kit qua nhu trinh bay trong bang 1
Bdng 1: Kit qud tinh todn lgt gio vd hieu sudt ldm viec ciia thiet bi BSKK
X h o n g s d
N h i e t d o k h o i d a u v a o c u a B S K K
N h i e t d o k h o i d a u r a c i i a B S K K
L u u l u o n g k h o i d 3 u v a o c u a B S K K
L I I U l u g o i g k h o i d d u r a c u a B S K K
N h i f t d d g i o d S u v a o c u a B S K K
N h i e t d o g i o d S u r a c u a B S K K
T y 16 l o t g i o
N h i e t d p d i r c m g k h o i r a k h i k h o n g t i n h d & i l p t g i o
H i e u s u i t p h i a d u r o n g k h d i
H i e u s u i t p h i a d i r d n g g i o
T y l e hi@u s u i t l a m v i e c c u a t h i d t b i
K y h i e u
n
n v^
K
T,
Tl
L
G S E
A S E
X
D o n v i
° C
•c
t / h
t / h
•c
•c
%
•c
%
Vo
-GiA t r i
3 8 0
1 3 5
5 4 0
5 8 0
4 0
3 4 0
6 , 9 0
1 4 1 , 5 5
7 0 , 1 3
8 8 , 2 4
0 , 7 9
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Trang 6NGHIEN CO'U-TRAO D 6 |
Td cic kit qua thu dflpc cho thiy, ty le Ipt
gid v i h i l u suit l i m viec cua BSKK la dat yeu cau
so vdi chi tieu thiet ke ban diu
4 CAC VAN DE THIET KE BO PHAN CHEN
KiN DE GIAM LOT G l O - K H o i TRONG
BSKK [4]
Rit khd cd phflpng i n cd the chen kin
trong cic BSKK kieu quay, vi nd cd dfldng kinh
Idn (cd the len d i n 18 m) va chenh lech Idn
nhiet dp gifla cac p h i n td d i u ndng va dau lanh
(khoang hPn 200°C), hai y l u td nay kit hpp khiln
rdto hi bien dang do nhiet Khdng it trfldng hpp
xay ra hien tflpng cic canh ngoii rotor cua BSKK
hi xl xudng d i n hPn 5 cm so vdi khi d trang thii
lanh Do viy, trong dieu Iden hiln nay, chUa cd
cdng nghe nao cd the chen kin dUpc hoan toin
bp say khdng khi Trong khudn khd bai viet nay,
nhdm t i c gii de cap den mdt trong nhdng bien
phip Iam kin trong BSKK hdi nhilt kieu quay
4.1 Sd do k i t c i u chen kin
Di thilt ke cic bd phan chen kin trong
bd say khdng khi, can xac dinh dUpc cac vi tri
cin lim kin dfla t r i n cd sd p h i n tich h i l n tflpng
lpt gid xiy ra trong BSKK Tren hinh 3 la sd dd
md ta cic vi tri cin lam kin cua BSKK Nhu viy:
- De lam kin hiln tupng lpt gid trflc tilp,
can lam kin bang cac bd p h i n chen kin chu vi va
bd phan chen hudng kinh d c i hai phia d i u ndng
vi diu lanh cua BSKK;
- De lam kin hien tfldng Ipt gid cudn
theo, can lam kin bang cic bd p h i n chen kin
hfldng true cua BSKK
4.2 Xac dinh khe h d cac b o phan chen kin
Hiln tflpng thay doi khe hd chen kin tai cic vi tri neu trin cd the dan d i n cp sit gifla
p h i n ddng la cic chi tilt tam chen lap tren rotor
quay v i phan tinh l i cac tam chen co dinh lip
tren vd rotor v i cac khung b l dd (tim chen re quat) Day la mpt trong cac nguyen n h i n giy ra ket d bp say khdng khi
Khi cin chinh khe hd, can thilt phai dilu chinh cic tam chen hfldng kinh dau ndng d trang thai lanh (sP do hinh 3 v i hinh 4) de d i m bao khe hd chen dat dflpc dp kin khit v i ddng phang trong sudt q u i trmh van h i n h bd siy khdng khi
Hinh 3 Sd do xac dinh cdc vi tri chen kin cua BSKK
kieu quay
Tim dita hinh re qu^t
f
zzH
Tim ctitn hir/mg kinh
Hinh 4 Sd do xac dinh khe hd chen kin theo hUdng kinh d trgng that Ignh
Nhflng gia tri trong bing 2 dfldi diy la tri
sd khe hd d trang thii ngupi dflpc tinh toan theo
Do cd sfl chenh nhilt dp, nen cd su cic thdng so thiet ke dUdi dieu kien tai Id hdi l i
bien dang nhilt cua rotor va lam rotor cd the Idn nhit Trong dd, sP do cac khe hd chen kin
gian nd doc true v i phin tam dudi cd t h i bi xe (A, B, G, H, M, N,R) dflpc md ta tren hinh 3 v i
xudng hinh 4 ^
I S S N 0 8 6 6 - 7 0 5 6
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Bdng 2 Gid tri khe hd tgi cdc vi tri chen kin cua BSKK d trgng thai Ignh:
Khe lid
Gia tri (mm)
K h e h d
Gia tri (mm)
A
0,5
G
10,0
B
20
H 5,0
c
1,0
M 5,0
K 5,0
N 2,0
D 2,0
R
18
4.3 Mdt so k i t qua t h i l t k l cac bd phan chen kin cua BSKK: Theo cac hinh tii 5 d i n 7
Hinh 5 Kit cdu tdm chen hUdng kinh
:3E~±i^"''
Hinh 6 Ket cdu tdm chen re quat
tl4J
sL fi
JU _
-I B L -I
129
^^
X
-"^"
\
Zif
Tl
^^Ll
i a
_— I
JLL
}
IJJ
Hinh 7 Kit cdu tdm chen chu v
ISSN 0866-7056 TAP CHi CO KHi VIET NAM, Sd 4 nam 2016
Trang 8NGHIEN CLfU-TRAO DOI
4.4 Vat lieu che tao bd phan chen
Trin cP sd dieu kiln lam viec cda bp ph^n t i m chen, chpn thep cacbon cd cic nguyin to hpp
kim phu hpp bd sung de n i n g cao tinh nang chiu i n mdn cua thep lam vit lieu che tao O day, chpn
vit lieu la thep 09CuPCrNi-A theo tieu chuin GB/T 4171 cua Trung Quoc hoac thep Cup-ten theo
tieu chuan JIS cua N h i t Bin cd thanh p h i n hda hpc nhfl Bang 3 va cP tinh theo Bang 4 [2]
Bdng 3: Thdnh phdn hoa hgc cua thep 09CuPCrNi-A theo tiiu chudn GB/T 4171:
Mac thep
Thep 09CuPCrNi-A
Thanh
C
<
0,12
Si
0,25-0,75
Mn
0,2 - 0,5
phan hoa hgc (%)
P
0,07-0,15
S
<0,04
Cu
0,25-0,55
Cr 0,3-1,25
Bdng 4: Co tinh ciia thip 09CuPCrNi-A theo tieu chuan GB/T 4171:
Ky h i l u
mac thep
Thep
09CuPCrNi-A
C h i l u day
(mm)
< 6
Gidi han ben
ob( iVIPa)
480
Gidi han chay os( MPa)
343
Do dan d i i
tfldng ddi S(%)
22
5 KET QUA VA DE XUAT
6 Viet Nam, vdi t6c do phat trien kinh te nhu hien nay, viec cac nha may dien dildc xay dung
nham phuc vu cho san xuat, kinh doanh va sinh hoat la hu6ng phat trien quan trong da duoc Nha
nUdc hoach dinh Hien co mot so cac nha may nhiet dien dot than da va dang dugc x^y dung, co
svi dung bo say khong khi hoi nhiet kieu quay nhU: Cac nha may nhiet dien Pha Lai 2, Hai Phong,
Quang Nmh, Mong Duong, Vung Ang, Duyen Hai Cac bo say khong khi tai cac nha may nay, chu
yeu dugc nhap b nUdc ngoai nhU: Mi, Trung Quoc, Xuat phat tU nhu cau sfl cac bo say khong khi
kilu hoi nhiet cua cac dU an xay dung cac nha may nhiet dien sap tcli, cung nhu viec che tao, sfla
chfla phu tung thay the cac bo say khong khi trong cac ky trung dai tu la rat Idn; do vay, hudng
nghito cflu che tao bo say kieu h6i nhiet se dap flng duoc yeu cau thUc te va gdp phan phat trien
nang lflc nganh Co khi ch^ tao trong nUdc, phat trien cong nghe che tao mot trong cac to hop thiet
bi quan trpng cua 16 hoi trong nha may nhiet dien cd cong suat tfl 300 den 600 MW, dan tien tdi thUc
hien muc tieu noi dia hoa nha may nhiet dien
Vdi sU phSi hop chat che gifla Vien Nghien cflu Co khi va Cong ty Nhiet dien Hai Phong da
che tao thanh cong cac modun khoi trao doi nhiet, tam chen kin cac loai cua bo say khong khi va
dUa vao lap dat, v^n hanh tot tai Cong ty tren • ''
ISSN 0866 - 7056
TAP CHi CO KHi VIET NAM, S6 4 nam 2016
Trang 9NGHIEN CU'U-TRAODOI
Ngiy n h i n bii: 10/3/2016
Ngay p h i n bien: 15/4/2016
Tai li^u tham khao:
[1] Nguyen Sy Mao; Ldhdi{td.p 1, tap 2), NXB Khoa hoc vaKy thuat Ha Ndi, 2006
[2] Ngd Tri Phuc, Tran A ^ Dich; So tay sU dung thep thi gidi, NXB Khoa hpc va Ky thuit, Ha Ndi, 2003 [31 Tieu chudn thep chong dn mow fc/iigwycn-GB/T 4171, Trung Quoc
[4], Tdi lieu khdo sdt cdc nhd mdy nhiit diin, nhom De tai thUc hien, Ha Npi, 2014
[5] Willmott, A.J.-RegeMerahVe/ieafec/ifln^ers-lhermopedia - 2011
[6] Regenerative air preheater with stationary heat retaining mass and revolving connections Koch Jalcob
-1965
[71 The Viefriam Air Pre/ieafer - Howden Sirocco - 25 June, 1995
[81 V Mallikarjuna N Jashuva; B Rama Bhupal Reddy - Improving Air efficienty by using air preheater
Abstract: Air pre-heater is a heat transfer surface in which air temperature is raised
ISSN 0866 - 7056
TAP CHf CO KHl VIET NAM, S6 4 nam 2016