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Kraft Black Liquor Recovery Boiler Efficiency Program

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This Computer Program calculates the Boiler Efficiency for a Kraft Pulp Mill Black Liquor Recovery Boiler which burns black liquor that came from the Pulp Washers and goes through Multiple Effect Evaporators to change the weak black liquor to heavy black liquor for use in the Recovery Furnace. The program input data to run this program is listed below:
1. Enter the date of the test: Optional
2. Enter the Boiler Manufacturer: Optional
3. Enter the Plant Name: Optional
4. Enter the Dimensions for the Boiler Furnace: Optional (Y for Yes or N for No)
a. Width (ft):
b. Depth (ft):
c. Height to the Bull Nose (ft):
5. Does the Boiler have a membrane wall? (Y for Yes or N for No)
6. Enter the Boiler Number: Optional
7. Enter the Boiler Ton/day Rating
This is the Pulp Mill Air Dry Tons per Day
8. Enter the Rated Steam Capacity (lbs steam/hr)
9. Enter the Steam Load During the Test (lbs steam/hr)
10. Enter the Drum Pressure (Psig)
11. Enter the Steam Gage Pressure Leaving the Boiler Superheater (Psig)
12. Enter the Steam Temperature Leaving the Boiler Superheater (F)
13. Enter the Boiler Feedwater Temperature Entering the Boiler Economizer (F)
14. Enter the Boiler Feedwater Temperature Entering the Boiler Drum (F)
15. Number of Water Walls:
16. Enter the Percent of Continuous Blowdown:
17. Enter the Soot Blowing Steam Flow (lbs steam/hr)
18. Does the Boiler Have:
a. Direct Contact Black Liquor Evaporator
b. Indirect Contact Black Liquor Concentrator
19. Provide the As Fired Black Liquor Analysis – Dry Weight Basis Analysis
a. % Sodium
b. % Carbon
c. % Hydrogen
d. % Sulfur
e. % Oxygen
f. % Potassium
g. % Chlorine
h. % Inerts
20. Enter the Gross Heating Value of the Liquor HHV (Btu/lb bd liquor):
21. Enter the Smelt Temperature (F) if Known:
Used to determine the molten smelt heat loss.
22. Do you have a Smelt Analysis: Optional (Y for Yes or N for No)
If the answer is yes you must input the percent of Total Sodium
a. Na2S %
b. NaHS %
c. Na2SO4 %
23. Reduction Efficiency
24. Enter the Salt Cake Make-up (lbs/hr)
Saltcake make-up is usually around 3.0 lbs of saltcake per 100 lbs of bd black Liquor (or 90.00 lbs saltcake/Air Dry Ton of Pulp to 73.50 lbs saltcake/ADTon )
25. Enter the O2 in the Flue Gas
a. Enter D if the O2 is a Dry Basis Measurement (Percent O2 in the dry flue gas)
b. Enter W if the O2 is a Wet Basis Measurement
26. Enter the PPM of CO in the Flue Gas
27. Enter the Combustion Air Temperature (F) Entering the Boiler
28. Enter the Flue Gas Exit Temperature Leaving the Boiler Economizer or Leaving the Boiler Direct Contact Evaporator (F)
29. Enter the Heavy Black Liquor Input To The Boiler
a. GPM
b. Bone Dry Solids Per Day
c. Wet Solids Per Day
30. Enter the Percent Heavy Black Liquor Solids at the Guns
31. Enter the Temperature (F) of the Heavy Black Liquor Solids at the Guns
32. Enter the Percent Manufactures Loss Usually around 2 %

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Energy Balance for a Kraft Black Liquor Recovery Boiler
Boiler Energy Inputs Must Equal Boiler Energy Outputs

A. Energy Entering Boiler
1. Fuel HHV: 676,175,000.00 Btu/hr
2. Combustion Air (300 F): 40,682,395.47 Btu/hr
3. Black Liquor (260 F): 20,653,158.00 Btu/hr
4. Hot Water (290 F): 111,136,280.02 Btu/hr
5. Total Energy Inputs 848,646,833.49 Btu/hr

B. Energy Leaving Boiler
1. Flue Gas (405 F): 151,769,244.61 Btu/hr
2. Steam Output: 588,004,912.00 Btu/hr
3. Radiation Loss: 2,094,255.45 Btu/hr
4. Molten Smelt: 27,514,183.61 Btu/hr
5. Reduction Reactions 69,327,076.80 Btu/hr
6. Unaccounted Loss: 14,443,141.00 Btu/hr
7. Total Energy Leaving 853,152,813.47 Btu/hr (0.53 % error)

Berlin New Hampshire Rec. Boiler – Flue Gas Into Drum & Leaving Drum (PDF)
Berlin New Hampshire Rec. Boiler – Flue Gas Into Economizer & Leaving Economizer (PDF)
Berlin New Hampshire Rec. Boiler – Total Energy Analysis Diagram (PDF)


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PO Box 8695
Green Bay, WI 54308