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1 20 (X) ( 2 )

1. 300 2500C 300C 41.87 kJ/m2h 0C

. 8.68 MJ/mh. 8.78 MJ/mh. 520.75 MJ/mh. 254.34 MJ/mh

2. Steam trap . condensate .

. non condensable gases .

3. . . . .

4. boiler . boiler . . boiler.

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5. .. 2549

p H . 5.8 9.5. 5.8 11.8. 8.5 11.8. 9.5 12

6. Material SA 213 T 91 SA 335 P 91 . 9 % Cr. 1 % Mo

. 9 % Cr. 1 % Mo V. 9 % Cr. 0.1 % C. 0.9 % C. 1 % Mo

7. non destruction. visual. penetration. x ray

. hydrostatic8. 6 8 (barg) 250 ppm 1050C 3,500 ppm Blow down Blow down

. 4,000 . 400 . 461 . 450

9. boiler. Benson boiler. water tubed boiler. once through boiler. package boiler

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10. boiler

. . heat loss. .

11. 8 (barg) 1050C 8 enthalpy2,774 kJ/kg 4.18 kJ/kg K 85 % kg 1

. 63.72 kg. 64.12 kg. 66.12 kg. 65.72 kg

12. maximum allowable stress material

. ASME section 1. ASME section 2. ASME section VII. ASME section IX

13. . . . x ray.

14. boiler tubes . 6 . 1 . 2 . 3

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15. Deaerator

. pH . . .

16. boiler (hydrostatic test)

. 49 0C

. 590C

. 69 0C. 79 0C

17. boiler .. 2549 boiler boiler

. . 10 /

. 20 /. 30 /

18. boiler. blow down. . boiler.

19. (Condensate) . . . .

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20. condensate 10 bar flash 2 bar

1 / 2 bar. 883 kg/h. 117 kg/h. 674 kg/h. 326 kg/h

2 3

1. .. 2548 2550 superheater tube flue gas erosion 5.65 mm. 6.05 mm. . . minimum requiredthickness (ASME) (20 ) 16.6 Mpa 610 0C material SA 213 T 91 38.1 mm. corrosion allowance = 0

thickness factor for expanded tube ends = 0 maximum allowable stress SA 213 T 91 610 0C 57.36 Mpa

t = PD / (2S + P) + 0.005 D + C2

+ e

. thinning rate

2548 2550 2 superheater tube 6.05 5.65 = 0.4 mm. thinning rate = 0.2 mm/

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. minimum required thickness

P = 16.6 MPa , T = 6100

C , D = 38.1 mm.,

C2

= 0 , e = 0

S 610 0C = 57.36 MPa

t = (16.6 x 38.1) / (2 x 57.36 + 16.6) + 0.005 x 38.1 + 0

minimum required thickness t = 5.01 mm.. minimum required thickness

5.65 (0.2 x y) < 5.01

y = 4 .. 2550 minimum required thickness .. 2554

2. 800 / 5,500 / 1 MPa 850C 19.14 MJ/kg (dryness fraction) 0.9

boiler (20 )

(b) = x)

h

(h

(ms) = 5,500 / (mf) = 800 /

h = hf+ x hfg = 763 + 0.9 (2,015)

= 2,576.5 kJ/kg

C085h = 355.9 kJ/kg

b

=310x19.14x800

355.9)(2,576.55,500

= 0.8

= 80 %

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3. 5 (barg)

3 (ton/h) 30 0.3215 m3/kg (20 )

m& = gvAC =

gv4

C2d

=g4 vC2d =

3,600310x3

d2 = 30x3,600 0.3215x4x310x3 = 0.1137 m2

d = 0.1066 m. = 106.6 mm.