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ti:
TNH TON THIT K B HMNCCHO L HI CNG
NGHIP
Nhm 5
TNH TON THIT K B HM NC
I HC BCH KHOA TP.HCM Cell: 01229159061NamcaoBkCK05BNH www.chuyenhochanh.tk
http://www.chuyenhochanh.tk/http://www.chuyenhochanh.tk/ -
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TNH TON THIT K B HM NC
GII THIU
TNH TON - THIT K
KT LUN
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TNH TON THIT K B HM NC
KHI NIM
PHNG
PHP NI
CU TO PHN LOI
MC CH
GIITHIU
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Khi nim B hm nc l nhngb mt truynnhittpha sau l tndngnhitthicakhi sau khi ra khibqu nhit,c tc
dngnng cao hiusutcho l hi. Chnh vl do ny m b hm nc cn c tn l btitkimnhin liu.
uvo cabhm ncnhitcakim loic trsnhnhtso viccbmttruynnhitchup sutcal.
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Gang
TNH TON THIT K B HM NC
76 120 Chu mn tt C cnh So le hoc song song
Thp
28 ;32 ; 38 D mn Khng cnh So le hoc song song
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TNH TON THIT K B HM NC
CU TO
V mt cu to b hm nc c chia lm
ba loi sau: ng thp n
ng thp c cnh Bng gang
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loithp c cnh, cnh nmdctheo bn
ngoi ngbng cch hn hocch to linmtkhi. cnh cngc thc dnghnh alpkhtving. vict thm cnh l tng thm bmt truyn nhit cho ng, hin nay hu nh
khng sdngloingthp c cnh do chtophctp
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C cu treo hay ng xon c ta lnhay treo vo cc dm. Dmc dnghnh
ng c gn vi khung l. V dm ttrong vng khi c nhitcao nn bovdm,ngita thngcch nhitdmvlm mt bng dng khng kh lu ng t
nhin qua dmhoc lungcngbcbngcch nidmviuht hay uyqutgi.
TNH TON THIT K B HM NC
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Vmttruynnhitcngnhvmtcuto,mtphngngxonc tht song song hayvung gc vi ngc l. Vi kch thc ngkhi l bc ng cho, s lng ng xonsong song slnnhtkhibtr mtphngngxonvung gc vingcl. Ty thucvo vicb tr m tcnci trong ngxonslnnhthay nhnht. Song thc ra vicb trngxon khng phida trn yu cuca tcnci trong ngm chyudavo iu
kincmngkhibmi mn.
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Nub tr mtphng ng xon vung gcv tng sau ca l th tuy vicgingxonngin hnrtnhiudo ngkhi hp,ngxonngn,nhngkhi yttccc ngxonui qua vng khi st tng sau ca l l vngkhi c nngtro lnnhtnn ttccc ngxonbmi mn. V vy trong cc l hihinnay ngita ubtr ngxonnmtrong mt
phngsong song vingcl.
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Trong mt s l
b ncngoi, m bo tc nc trong ngxon, ngi ta c
thb tr ng xontheo dng khnggian chkhngphitrong mt mt
phng. khi y tonbhm ncc thch c mt ngxon.
TNH TON THIT K B HM NC
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Vicb tr ng xon theo dng khng giancho php gimbcdccangkh nhiu,v
khi ybcdccangkhngphthucg vobn knh c. Do kch thc khng gian cab hm nc gim i nhiu, nhng ch to v
sa cha tng iphc tp. Tc nc itrong cc ng xon cab hm nc ch yucchn trn csngnngahin tngnmn. Trong b hm nc khng si hay phnchasi cabhm ncsi, tcncphikhng nhhn0,3 m/s khiphtinhmc. bhm ncsi, ngnngaschuynng
phn lptcncphitrn 1 m/s.
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ng gp cab hm nc l cc ng gpnhnhttrong cc nggp cal. nhnglc bhm nckhng chia lm hai phn theochiurngngkhi, nggp uvo v u
ra co thtmtbn hay hai bn, ty thucvobmttcabhm nc. Thng thngkim tra,lm sch,sachang gp ngita thngclhai uv ynpbnghnh
van. Hinnay mts l hingi ta y lbng cch hn kn np vi ng gp. Khi cnlam schtho npra v sau hn li.
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TNH TON THIT K B HM NC
Bhm ncbnggang
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Bhm ncbnggang gmnhngngbnggang c. ngknh khongt76 120 mm,di khong1,5 3 m.
Nhngngny thngnitipvinhaubngnhngmtbch cngbnggang c. Do gang c h s dn nhit km nn tng
cnghs truynnhitngi ta c thm
cnh cho cc ng v gi l ngbng gang ccnh.
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Do cc ngc cnh nn tro bm ln ngrtnhiu,v vybhm ncbnggang cnphitthem thitbthibi.
Bhm ncbnggang csdngkh rngri
cho cc l hi cng nghip v l nh khng c nhngphngphp xl nchon thindo gang chinmn tthnthp.
Mtkhc do gang tbnhnthp, gin, khng chu
ctc dngva pnn ngita khng dng gang chtocho nhngbhm ncbnggang chchtolm vicvip sutti2,75 MN/m2, mtsnckhcngita chtotip sut6MN/m2.
TNH TON THIT K B HM NC
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TNH TON THIT K B HM NC
Khng ngt c ra
khi h thng l
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Ti nhng ch ni gia ng nc cp vi bao hirt d gy ra hin tng ng sut nhit cc blm cho kim loi bao hi v ng dn nc d
sinh ra hin tng nt n lm r r nc v hi. khc phc hin tng h hng trn, ngi ta
thng lp cc ng bo v, cc ng ny c th
gin n t do khi nhit thay i ng thi vnm bo kn cc ng ni.
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TNH TON THIT K B HM NC
NG DNG B HM NC
C t Vit T Ph Th
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Cng ty Vit Tr Ph Th
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TNH TON THIT K Thng s :Sn lng hi D=10 tan/h
Nhit khi thi:
H s khng kh tha: lt khng kh trong b hm nc :0,05
Hm lng kh CO :
Cu a:Tnh ton cc thng s c bn cho b hmnc.
Cu b:Tnh ton tr lc khi i qua thit b
200otht C
1, 25
0 00 01, 5CO
TNH TON THIT K B HM NC
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TNH TON THIT K B HM NC
Chn than Abtraxit c Wlv
= 1,5 , Alv
=30,1 , Clv
=63,5, Nlv=1 , Sclv= 0,3 , Olv=1,8
Tt c cc tnh ton cho 1 kgQt
lv= 339Clv+ 1030Hlv109(Olv- Sclv)25 Wlv
=339.63,5+1030.1,8-109(1,8-0,3)-25.1,5=22842 kJ/kg
Th tch khng kh l thuyt ( =1)
Vkk0= 0,089( Clv+0,375Sclv) +0,265Hlv- 0,033Olv=0,089(63,5+0,375.0,3) + 0,265.1,8- 0,033.1,8=6,08
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Ta chn tnh ton cho b hm nc kiu khng si
dng ng xon bng thp trn c ng knh chns b:
Kt cu:
TNH TON THIT K B HM NC
1
2
32, 22
26
d wmkd
TNH TON THIT K B HM NC
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Chn t vo b hm nc l
Tra bng nc bo ha ta c (p=5bar)
V thit k b hm nc khng si nn ta chn t ra
ca nc nh hn so vi t si ca nc trong bhm => chn
Tnh lng tiu hao nhin liu
Tra bng nc cha si vi
TNH TON THIT K B HM NC0
2" 30t C
0151,84 , ' 640,1 , " 2749skJ kJ t C i i
kg kg
040 C0
" 110t C
0" 100 , 5 461, 4nc
kJt C p bar ikg
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Tra bng nc cha si vi:
Nhit lng gia nhit nc thnh hi bo ha p sut 5 bar l:
D:sn lng hi:entanpy ca hi nc bo ha
:entanpy ca nc cp 5bar
Khng hm nc:
TNH TON THIT K B HM NC
0
' 30 , 5 126,5nc kJt C p bar i kg
( )bh nc
Q D i i
bh
nc
i
i
10000(2749 126,1) 7285,83
3600Q kN
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Ta s tit kim c lng nhin liu l:
Tnh hiu sut ca l:
Khng tn dng khi thi =>Tn tht nhit do khithi:
:Entanpy ca khi thi
:Entanpy khng kh lnh
TNH TON THIT K B HM NC
0,319 0, 27812,85%
0,319
42 1
1( )
100kkl
qQ I I
0350
kt Cqn
kkl
I
I
O
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Vi :
V t than trn l ghi nn ta chn khi thi
TNH TON THIT K B HM NC
2 2 2
2 2 2 2 2 2
1 ( )
( ) ( ) ( ) ( ) . ( ) ( ) ( )
( ) ( )
(1 )
.( ) .( ) ( ) (1 ) .( )
5280,33
. .( ) . 370,5
RO CO H O N kk
RO CO RO CO N N H O H O kk kk
kkl kk kkl kkl
I I I I I
V Ct V Ct V Ct V Ct
kJ
kgkJI V Ct t
kg
0 0 00 0 04 3 6
2
10 , 0 , 1
100 10(5280,33 370,5) 4418,85
100
q q q
kJQkg
TNH TON THIT K B HM NC
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% tn tht do khi thi :
Hiu sut ca l hi:
C s dng b hm nc:
Tn tht do khi thi mang ra ngoi
TNH TON THIT K B HM NC
22 .100% 19, 35%
dv
QqQ
1 2 3 4 5 6100% ( ) 68, 65%q q q q q q
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Phn trm tn tht do khi thi:
Hiu sut ca l:
22 .100% 6, 01%
dv
Qq
Q
2 1 2 3 4 5 2100 ( )
100 (6, 01 1 10 1) 81,99%
q q q q q q q
TNH TON THIT K B HM NC
TNH TON THIT K B HM NC
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Phn trm tn tht do khi thi:
Hiu sut ca l:
22 .100% 6, 01%
dv
Qq
Q
2 1 2 3 4 5 2100 ( )
100 (6, 01 1 10 1) 81,99%
q q q q q q q
TNH TON THIT K B HM NC
TNH TON THIT K B HM NC
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Tnh ton truyn nhit
v pha ncNhit trung bnh ca nc
Tra bng thng s vt l ca nc:
02 22
' '' 30 11070
2 2
t tt
2
2
2
3
2
2
6 22
997, 8 /
66,8.10 w /
4,187
0, 415.10 /
2,55
f
p
f
Kg m
mK
c
v m s
Pr
TNH TON THIT K B HM NC
TNH TON THIT K B HM NC
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Nhit lngtruyn cho nc:
Tr s ca nc
Chn tc ca nc
22 2 2. .( '' ' )
10000 .4,187.(110 30) 930, 44 w3600
pQ G c t t
K
2Ref
2
2
4 42 2
6
. 0,6.0,026Re 3,76.10 10
0,415.10f
f
w d
v
2 0, 6 /w m s
TNH TON THIT K B HM NC
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V do coi2 1 0,25Pr( ) 1
Pr
f
w
2 2
0,8 0,43
2
4 0,43
0, 021. Re . Pr
0,021.(3,76.10 ).2,55
143,61
f fNu
222 2
2
. 143,61.66,8.103690w /
0,026
Num k
d
TNH TON THIT K B HM NC
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V pha khi
Ta c
Chn sb
Ta c
37,862 /k
v m kg
2
30, 617 /
1,128 /
k
p
kg m
c kj kgk
7,8627 /
1,122
930,44 w
k
k
k
p
k n
VG kj s
c
Q Q k
TNH TON THIT K B HM NC
TNH TON THIT K B HM NC
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Nhit trung bnh ca khi
1 1 1 1
0
1 1
. ( ' ) ( ' '' )
930,44'' ' 350 118
7,862
kk k p k
k
k
Q G c t t V t t
Qt t C
V
01 1
1
' '' 350 118
2342 2
t t
t C
TNH TON THIT K B HM NC
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Tra bng thng s vt l ca khi
1
1
1
2
3
1
2
6 2
0, 914 /
3, 29.10 w /
1,073
23, 57.10 /
0,69
f
p
f
f
Kg m
mK
c
v m s
Pr
TNH TON THIT K B HM NC
TNH TON THIT K B HM NC
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Tr s ca khi
Chm ng b tr so le nn
Re f
1
1
4 41 1
6
. 10.0,032Re 1,36.10 10
23,57.10
f
f
w d
v
1 1
0,6 0,36
2
4 0,36
0, 4.Re .Pr
0, 4.(1, 36.10 ).0, 69
105,32
f fNu
TNH TON THIT K B HM NC
TNH TON THIT K B HM NC
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Do b bm bn trn b mt v pha khi v mts nh hng khc, trong k thut ngi tathng chn:
2
1 1
2
1 2
0,8 ' 0,8.109 87 /
1 184 /
1/ / 1/ 1/ 87 0,003 / 22 1/ 3690
w m k
k w m k
TNH TON THIT K B HM NC
TNH TON THIT K B HM NC
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chnh nhit trung bnh
0
1' 350t C
0
2' 30t C
0
2'' 350t C
01'' 118t C
TNH TON THIT K B HM NC
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Din tch truyn nhit ca thit b
S ng ca b hm
ng
0
ax min
1 1
( ) (320 8) 1642 2mt t t C
3
2930,44.10 67,54. 84.164QF m
k t
2
2 2
1 2
4. 4.10000
. . .w .3600 977,8. .0, 026 .0, 6.3600
Gn d
9
TNH TON THIT K B HM NC
TNH TON THIT K B HM NC
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Chiu di mi phn t c tnh:
67,5482,37
. 0, 029.9tb
FL m
d n
TNH TON THIT K B HM NC
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KET LUAN
Viec tan dung nhiet khoi thai cua lo hi cong nghiep e nang cao hieu
suat s dung nang lng la van e ang c quan tam nham giai quyet
hai van e c ban o la nhu cau s dung nang lng ngay cang tangtrong tnh hnh cac nguon nang lng trong thien nhien ngay cang can kiet
nhanh chong .
T nhng vn a trnh bay va phan tch nhng phng an tan dungnhiet khoi thai va khang nh phng an tan dung nhiet khoi thai e
nang cao nhiet o ham nc cap mang lai hieu qua kinh te cao hn
TNH TON THIT K B HM NC