供 热 工程
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供 热 工程. GONG RE GONG CHENG. 单元 9 供热热网的水力计算. 武汉理工大学出版社. 单元 9 供热热网的水力计算. 【 知识目标 】 1. 理解集中供热系统中各热用户热负荷的概算方法； 2. 了解集中供热系统的年耗热量计算方法； 3. 掌握热水管网水力计算的基本原理、方法与步骤。 【 能力目标 】 1. 能进行集中供热系统各热用户热负荷的确定； 2. 会进行热水管网的水力计算，确定供热管道的管径。. 1. 课题 1 集中供热系统的热负荷. 2. 课题 2 热水管网水力计算的基本原理. 课题 3 热水热网的水力计算. - PowerPoint PPT PresentationTRANSCRIPT
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9 1.2.3.1.2.
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3
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1 9.1.1
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9.1.1.1 1
kW m3 W/(m3)11m3
1
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2:
kW m2 W/m2 9-1
9-1 5%1
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9.1.1.2 1
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1
kW m3 1,W/(m3) 1
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2
kW 0.3~0.5 kW1
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9.1.1.3(1) 1
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1
kW m2 W/m29-2 9-2 1. 2.10%1
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2
kW 2~3
1
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(2) 1052~3L/100kg100~250kg0.15~0.25MPa 1
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9.1.1.4 130~1500.4~0.6MPa 130~150250250~3001
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1
kWh/aGJ/a kW d 0.08640.0864=24360010-69.1.2 1
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2
kWh/aGJ/a h/d kW 0.00361kWh =360010-6 GJ1
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3
kWh/aGJ/a kW (15),d1
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4
: GJ/a 112GJ/d 112d1
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1 2 3
2
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t/hRdG
Pa/m t/h m kg/m3
9.2.1 (9-11) 2
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0.5m/s
40mm
m (9-13) (9-12) m 2
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(9-13)(9-11)
(9-14) (9-15) (9-16) 2
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(9-14)~ (9-16)9-11
9-1 =0.5mmmm(9-17) 2
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mm Pa/m 9-3
9-3
2
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2
9-1(kg/m3)(Pa/m)(m/s) kg/m3 (Pa/m)(m/s)(9-19) (9-18) 2
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3
m m (9-20) 2
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Pa
9.2.2 (9-21) Pj 2
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m mm(9-22) 2
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9-2 =0.5mm9-2
9.2m mm m 9-3
(9-23) 2
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:
Pa/m; Pa m 9-3
(9-24) 2
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Pa Pa/m m L
,%(9-3) m(9-25) (9-26) 2
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3 9.3.1
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1
t/h kW =4.187kJ/kg(9-27) 3
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2 39-1 49-2 59-1(9-25) 6
3
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[9-1] 9-1 =130 =70EFD 1200kW1000kW1300kW =50kPa
9.3.2 9-1 3
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[] (1) E(9-27)
FD =14.33t/h =18.63t/h9-4(t/h) 9-4 3
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(2) 50kPaD9-1 =40~80Pa/m AB =14.33+17.20+18.63=50.16(t/h)AB 9-1AB d=150mm =58.19 Pa/m =0.82 m/s AB9-2 12.24=2.24(m) 415.4=61.6(m) =2.24+61.6=63.84(m)3
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AB =230+63.84=293.84m AB =58.19293.84=17098.55(Pa) BCCD9-4 BC BC DN =125mm 14.4=4.4m 10.44=0.44m 312.5=37.5m =42.34m CD =44.48m = + + =17098.55+13362.53+16834.89=47295.97(Pa)3
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(3) BEBDBE = + =13362.53+16834.89=30197.42 Pa =0.69-3
=17.20 t/h9-1 = 80mm =168.68Pa/m =0.95 m/sBE 9-2:
=222.04 Pa/m 3
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13.82=3.82m 27.9=15.8m 21.28=2.56m
=22.18m BE =85+22.18=107.18m BE =168.68107.18=18079.12(Pa) = =30197.4218079.12=12118.3 (Pa) CF 9-43
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(1) 9-4K=0.2mm=lkgm3lkgm39-189-19 KshKb=0.2mm9-17 4 9.4.1
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(2) 9-2(3) 1 200mm 80ms 200mm 50ms 2 200mm 60ms 200mm 35ms4
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(1)
Gt/h QKW rKJ/Kg (2)
9.4.2 (9-28) 4
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(3)
Pa Lm 9-3(4)
Pa m(9-29) 4
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(5)
kgm3 kgm3(6) 9-19 (7) 9-4 (8) 9-189-19
9-31 4
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(9) (10) 9-2Ld (11) (12) (13) 4
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9-2 9-210105PaPD=8105PaPE=6105Pa,9-2 4 []
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AB:711.26 (719+39.5)=217.35(m)BC:711.26 (719+7.24)=176.70(m)CD:2111.26 (212.5+8.8+18.5)=65.90(m)CE:1111.26 (16.8+4+9.6)=25.70(m) 9-5 9-2 4
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(1) (2) (3) 6-35 9.5.1
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9-39-3G2.0thP12.5barP21barP30.4barL1=160mK=0.5mmh1=4.0mh2=2.5mL2=200mP4=5kPa 9-3 1-2-3-4-5-6- 9.5.2 5
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