TÍNH TOÁN THIẾT KẾ BỘ HÂM NƯỚC CHO LÒ HƠI CÔNG NGHIỆP

8/13/2019 TNH TON THIT K B HM NC CHO L HI CNG NGHIP

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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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GII THIU

TNH TON - THIT K

KT LUN


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KHI NIM

PHNG

PHP NI

CU TO PHN LOI

MC CH

GIITHIU


4/53

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


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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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.



12/53

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.



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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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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.



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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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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



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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:


1

2

32, 22

26

d wmkd



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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:


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


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


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



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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


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




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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




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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




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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




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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




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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




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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




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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




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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




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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




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chnh nhit trung bnh

0

1' 350t C

0

2' 30t C

0

2'' 350t C

01'' 118t C




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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




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Chiu di mi phn t c tnh:

67,5482,37

. 0, 029.9tb

FL m

d n




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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


TÍNH TOÁN THIẾT KẾ BỘ HÂM NƯỚC CHO LÒ HƠI CÔNG NGHIỆP

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