Sponsors: 1 National Development and Reform Commission energy project: No. [2010] 2921. 2 Tianjin Development and Reform Commission infrastructual project: No. [2010] 2921.

Analysis to Heat Loss of Steam Pipeline Network in Economic Development Zone

Shen Gang1, 2, You Shijun1, Wu Wenzhong2 1: School of Environment Science and Technology

Tianjin University 2: Tianjin T & B Thermal Power Co., Ltd.

Tianjin China E-mail: sg9669@126.com

Abstract—Energy conservation and rational usage of energy is China's basic national policy. The present steam consumption and heat loss of its pipeline network in Tianjin airport economic development zone is recorded, then zonal steam distribution efficiency is calculated to be 37.56 % by the steam consumption data, and zonal heat loss is in inverse proportion to steam distribution efficiency with factor of 8.312 104 kW, that is, in direct proportion to steam produce, steam enthalpy difference, inverse proportion to steam consumption with factor of 83.12 kW by the steam distribution efficiency, offering reasons to optimize steam pipeline network operation, and cover steam requirement with minimal energy consumption.

Keywords-economic development zone; steam pipeline network; energy distribution efficiency; heat loss

I.

[1]

[2-6] 20098.5 109 m2[7,8]

[9]

[10]

II.

2

4 75 t/h[11]

3823.5 m2 12.77 km457.1 t/h, 280 1.4 MPa

50 %[12] 1

Figure 1. .

A.

2911978-1-4244-9439-2/11/$26.00 ©2011 IEEE

2

110 t/h, 72 t/h Table 2008.9-2009.8

TABLE I. (T)

month consumption supply

2008.9-2008.12 131917 213996

2009.1-2009.8 309411 448676

total 441328 662672

B. Table 2

22.6 % 2 45 % (2008 9 ) 23 % (2009 4 )

TABLE II.

month Loss (kW) Averaged Loss rate (%)

2008.9-2008.12 82079 39.25

2009.1-2009.8 139265 30.38

total 221344 33

Figure 2. .

C.

1) :

200 0.045 w/m.k 150 50 mm

6391.542 kW () 11334.75

kg/h 14.98 % (2008 9 2009 875.64 t/h)

2462.5 kW 1228.70 kW 1635.08 kW

Table 3(GB50264-1997)

4(GB50264-1997)

200 140 W/m2

263.38 W/m2

TABLE III.

laying method of pipe

Pipe diameter

(mm)r

Pipe length

(m)

insulation thermal

conductivity ( )

thickness of

insulation (m)

heat loss of pipe (kW)

trench 500-800 10044.01 0.74-0.81 0.13-0.15 72462.50

overhead 50-800 4657.37 0.76 0.05-0.1 1226.70 direct burial 50-800 17599.42 0.071 0.091-

0.223 1635.08

Figure 3. .

2) : 82 DN25 ( 5) DN25

121 kg/h90 %

2912

3

1984.4 kg/h 2.62 % (2008 9 20098 75.64 t/h)

3) :

5 %

14.98 %2.62 %

5 % 22.6 %

Figure 4. .

Figure 5. .

III.

2009.1-2009.8

75 t/h4 75 t/h

1604230.96 GJ 38524.79 GJ121.78 GJ 1642877.53 GJ 1380301.80 GJ

112.55 t/h

4 75 t/h3.82 MPa 1.0 1.2 MPa3030 KJ/kg (1.18 MPa 292 ), 2780 KJ/kg (1.08 MPa) 0.785 MPa[11]

[10,13]

2020 kJ/kg =− usesteamproducesteam ii 1010 kJ/kg

( Table ) 4 75 t/h2009.1 2009.8 3 215697 GJ

=producesteamQ 290 GJ/h

=producesteami 3030

kJ/kg =usesteamD 110 t/h(Equation

(1))

( )%56.37

%100103

=

×−⋅

⋅=

usesteamproducesteamproducesteam

usesteam

networksteam

iiQD

η

(1)

producegasi - kJ/kg

usegasi - kJ/kg

IV.

usesteamproducesteam ii − [14] 0

(1) networksteamη useteamDs

usesteamproducesteam ii − (Equation (2))

2913

4

( )usesteam

usesteamproducesteamproducesteam

networksteam

netheat

DiiQ

k

k

L

−⋅⋅′=

=η

(2)

kk ′, − 2008.9−2009.8

6391.542 kW (1) (2) (Equation (3))

kWkkWk 12.83,10312.8 4 =′×= (3)

V. 1 110 t/h,

72 t/h 2008.9-2009.86391.542 kW

2 4 75 t/h3.82 MPa 1.0 1.2 MPa3030 KJ/kg 2020 kJ/kg 110 t/h37.56 %

3 8.312 104 kW

83.12 kW

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