Boiler efficiency .xls

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

mB

=

mD . (h - h Spw) . 100%

w

Hu . hK

mB

: Fuel consumption in kg/h and m 3/h respectively

mD

: Steam out put in kg/h

u

h

: Enthalpy of steam in kcal/kg

u

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

u

Hu

: LHV in kcal/kg and kcal/m 3 respectively

u

hK

: Boiler efficiency in %

u

hSpw

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

=

mSpw - m Abs

mSpw

: Feed water quantity in kg/h

u

m Abs

: Demineralisation quantity in kg/h

u

2.2. Boiler Efficiency

hK

=

(mSpw - m Abs) . (h - h Spw) mB . Hu

. 100

2.3. Determination of boiler efficiency in basis of exhaust as measurements

hK

=

100% - X A % - 2 %(max)

Exhaust gas loss X A ta - tu

[%]

K

on the

[%]

CO2 measured

.

ta

= Exhaust gas temperature in oC

tu

= Combustion air temperature in oC

CO2

= 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

Coal Consumption per (X) tons of steam

645

Coal Consumption Expectation kgs/ (X) T-steam

DATA 40000

kgh bar.A

60

o

C

kcal/kg

Total Steam Production per-Day

tons/d 3

1005.00

m /d

93.47

m /d

92.7%

82.9%

kgs per-hour 

40.0

ton/h

697.0

kcal/kg

60

kcal/kg

5000

kcal/kg

79.0%

0.790

960.58

6450.6

Parameter

16 6000

kgs

619,636 per-Day

Coal Consumption Per-Hour (OPR)

3

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

. 240

o

30

o

1250

C

C ppm

Parameter at saturation condition of water and steam depending on pressu barg

1

2

3

4

5

6

7

8

9

10

11

12

639.0

646.1

650.8

653.8

656.2

658.1

659.7

661.0

662.1

663.1

646.4

664.6

h'water h"steam

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%

re 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%