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The Boiler model simulates a base or swing loaded boiler. It can be used to represent either a recovery, hog fuel or power boiler.
There are two calculation types for the Boiler model. If the boiler is a base loaded boiler, the model calculates the amount of steam produced from a given amount of
fuel. If swing loaded, the boiler calculates the amount of fuel necessary to produce a given amount of steam. The feed water flow is calculated for both types of boilers.
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What do you want to see?
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Data |
Unit |
Description |
|
Set |
Item |
Type |
Native |
|
Equipment Properties |
BaseLoad |
|
|
If checked (True) the boiler is base loaded. |
|
DrumPres |
Pressure |
psia |
The Steam Drum Pressure is assigned to the blowdown outlet. |
|
SteamOutPres |
Pressure |
psia |
This is the pressure of the steam outlet. |
|
SteamOutTemp |
Temperature |
F |
This is the temperature of the steam outlet. |
|
SootBlowFlow |
Mass Flow |
lbs/hr |
The soot blowing steam inlet is optional. If there is a soot blowing steam stream
the Soot Blowing Steam Flow is assigned to the stream. |
|
Blowdown |
Fraction or Percent |
Fraction |
Set the Blowdown Feedwater Flow as a fraction of the feedwater flow. The resulting
flow is assigned to the blowdown outlet. This flow is added to the feed water flow. |
|
OtherHeat |
Enthalpy |
BTU/lb |
Other Heat Input is additional heat per mass of dry fuel. |
|
Efficiency |
Fraction or Percent |
Fraction |
The boiler efficiency is the efficiency in transferring heat from the combusted
fuel (and other heat input) to the feed water to produce steam. |
|
FlueGasTemp |
Temperature |
F |
Temperature of the outlet flue gas. Only required if both an Air_In and a FlueGas_Out
streams are given. |
| ExcessO2 |
Fraction or Percent |
Fraction |
Excess O2 in Air_In stream. Only required if Air_in and FlueGas_Out streams are
given. |
The Boiler model simulates a base or swing loaded boiler. It can be used to represent either a recovery, hog fuel or power boiler.
There are two calculation types for the Boiler model. If the boiler is a base loaded boiler, the model calculates the amount of steam produced from a given amount of
fuel. If swing loaded, the boiler calculates the amount of fuel necessary to produce a given amount of steam. The feedwater flow is calculated for both types of boilers.
If a base loaded boiler is selected, the feedwater flow and steam flow are calculated from:
Ffeedwater = ( Ffuel * ( 1.0 - fmoist ) * hinput * Eff ) / ( ( 1.0 - fblow ) * hsteam + fblow * hblow - hfeedwater )
Fsteam = ( 1.0 - fblow ) * Ffeedwater
For swing load boilers the feedwater flow and fuel flow are calculated from:
Ffeedwater = Fsteam + Fblow
Ffuel = ( Fsteam * hsteam + Fblow * hblow - Ffeedwater * hfeedwater ) / ( hinput * Eff ) * ( 1.0 + fmoist / ( 1.0 - fmoist ) )
Fblow = fblow * Fsteam / ( 1.0 - fblow )
where:
Ffeedwater is the feedwater flow rate
Fblow is the blowdown flow rate
Ffuel is the fuel flow rate
Fsteam is the steam flow rate
fmoist is the fuel moisture fraction
fblow is the blowdown feedwater fraction
hfeedwater is the feedwater enthalpy
hinput is the total available energy per mass of fuel = hfuel + hother
hfuel is the fuel enthalpy
hsteam is the steam enthalpy
hblow is the blowdown enthalpy
hother is other heat input per mass of fuel
Eff is the boiler efficiency
Missing Stream(s)!
Solution: check if all the streams are connected to the equipment.
Fuel flow is zero!
Solution: Set a nonzero inlet flow.
Warnings 
Errors