Boiler Efficiency .xls 35r1k

2.1. Exact determination of fuel consumption with given steam output and steam condition

mB

=

mD . (h - hSpw) . 100% Hu .

w

hK

: Fuel consumption in kg/h and m3/h respectively : Steam out put in kg/h

u

h hSpw

: Enthalpy of steam in kcal/kg

u

: Enthalpy of feed water in kcal/kg (Economizer)

u

Hu

: LHV in kcal/kg and kcal/m3 respectively : Boiler efficiency in %

u

mB mD

hK

u

If the value for steam output cannot be established, it can be calculated using the following: w

mD

=

mSpw - mAbs

mSpw

: Feed water quantity in kg/h

u

mAbs

: Demineralisation quantity in kg/h

u

2.2. Boiler Efficiency

hK

=

(mSpw - mAbs) . (h - hSpw) mB . Hu

. 100

[%]

w

2.3. Determination of boiler efficiency in hK on the basis of exhaust gas measurements

hK

=

100% - XA % - 2 %(max)

[%]

w

Exhaust gas loss XA =

ta - tu

. SF

w

= ta tu CO2

CO2 measured

. SF

= Exhaust gas temperature in oC = Combustion air temperature in oC = Measured in ppm

SF (Siegert's Factor) SF

= with HFO

0.6

SF

= with LFO

0.58

SF

= with Natural Gas

0.47

SF

= with Coal

0.9

w

Coal Consumption per (X) tons of steam

645

Coal Consumption Expectation kgs/ (X) T-steam

DATA 40000

kgs

619,636 per-Day

40.0

ton/h

16

bar.A

697.0

kcal/kg

60

o

60

kcal/kg

5000

kcal/kg

C kcal/kg

0.790

tons/d

1005.00

m3/d

93.47

m3/d

92.7%

82.9%

15.1%

kgs per-hour

79.0%

Total Steam Production per-Day

960.58

6450.6

Parameter kgh

6000

Coal Consumption Per-Hour (OPR)

Steam Output per-hour (Avrg.)

40.0

tons/h

1,066.10 tons/d 105.52

tons/d

Actual Coal Consumption from Boiler Plant

5,500 137

kgs/hour kgs/Tsteam

15.1% 240

o

30

o

1250

C

C ppm

Parameter at saturation condition of water and steam depending on pressure barg h'water

1

2

3

4

5

6

7

8

9

10

11

12

h"steam

639.0

646.1

650.8

653.8

656.2

658.1

659.7

661.0

662.1

663.1

646.4

664.6

NCVCoal 4200 4300 4400 4500 4600 4700 4800 4900 5000 5100 5200 5300

hK

73.0% 74.0% 75.0% 76.5% 77.0% 77.5% 78.0% 78.5% 79.0% 79.5% 80.0% 80.5%

n pressure 13

14

15

16

17

18

19

20

22

24

26

28

30

665.2

665.8

666.3

666.8

667.1

667.5

667.8

668.0

668.5

668.8

669.1

669.2

669.3

5400 5500 5600 5700 5800 5900 6000 6100 6200 81.0% 81.5% 82.0% 82.5% 83.0% 83.5% 84.0% 84.5% 85.0%