The
first program handles boiler combustion,efficiency calculations.Up to
4 fuels(solid,liquid,gaseous) can be fired simultaneously and
the % duty for each fuel can be varied.(Of course,a single fuel can also
be handled).The program computes the boiler duty based on steam parameters,performs
combustion and efficiency calculations per ASME PTC 4.1 and arrives at
the air flow,flue gas flows,flue gas analysis,efficiencies on HHV,LHV basis
for each fuel and on overall basis.NOx,CO conversions are also computed
for each fuel.Duty refers to energy absorbed by steam.The following example
illustrates the type of problems that can be handled by this program.
Data as inputted in the program
| Project-Sample
Units-British steam flow=100,000 steam temp=700 steam pres=600 feed water temp=233 blow down=2 excess air=15 ambient temp=80 exit gas temp=320 rel humidity=60 radiation loss=0.5 unaccounted loss=0.5 comb air temp=80 |
%
nat gas duty=40
% fuel oil duty=60 fuel 1-nat gas analysis methane=90 ethane=5 propane=1 butane=1 carbon dioxide=2 nitrogen=1 fuel 2-fuel oil analysis carbon=87 hydrogen=13 deg API=32 fuel temp=80 |
| Boiler
duty-MM Btu/h=115.3
excess air-%=15 amb temp-F=80 exit gas temp-F=320 rel humidity-%=60 Flue gas analysis-% vol (wet/dry) co2 10.33/12.09 h20 14.61 n2 72.57/84.99 o2 2.49/2.92 so2 -/- total air-lb/h=114511 total flue gas-lb/h=121012 efficiency-%HHV=85.8 efficiency-%LHV=92.99 adiab comb temp-F=3288 |
| FUEL
1:gas % volume[% duty=40]
methane=90,ethane=5,propane=1,butane=1,carb diox=2,nitrogen=2 fuel and air input HHV-MM Btu/h=55.06 fuel fired-lb/h=2493 ad comb temp-F=3244 air/fuel ratio=18.56 gas/fuel=19.56 eff-lhv%=92.7 eff-hhv%=83.76 losses:dry gas-%=4.51 air moisture=.12 fuel moisture=10.61 radiation=.5 unaccounted=.5 flue gas analysis:% vol co2=8.55 h2o=17.92 n2=71.06 o2=2.46 so2=. LHV-Btu/lb=19954 HHV-Btu/lb=22083 fuel temp F=80 air temp F=80 NOx-ppmv/0.1lb per MM Btu HHV=82.7 CO-ppmv/0.1 lb per MM Btu HHV=135.9 |
| FUEL
2: oil-% weight [% duty=60]
carbon=87 hydrogen=13 sulfur=-nitrogen=- oxygen=- deg API=32 fuel and air input HHV-MM Btu/h=79.31 fuel fired-lb/h=4020 ad comb temp-F=3333 air/fuel ratio=16.97 gas/fuel=17.97 eff-lhv%=93.19 eff-hhv%=87.22 losses:dry gas-%=4.84 air moisture=.12 fuel moisture=6.81 radiation=.5 unaccounted=.5 flue gas analysis:% vol co2=11.57 h2o=12.29 n2=73.63 o2=2.51 so2=. LHV-Btu/lb=18463 HHV-Btu/lb=19727 fuel temp F=80 air temp F=80 NOx-ppmv/0.1 lb per MM Btu HHV=77.6 CO-ppmv/0.1 lb per MM Btu HHV=127.4 |
The
second program in this package performs combustion calculations with gas
turbine or engine exhaust or simply air. Given the exhaust gas flow(or
air flow),temperature and analysis in % volume,the program computes the
fuel energy required to raise the temperature of the incoming stream to
a desired level or the firing temperature given the fuel input. One can
also add augmenting air to the exhaust gas flow. Final flue gas analysis
is also given.Gas or oil fuels only.
Data
| project-study
units-British exhaust gas flow=127000 exhaust gas temp=900 exhaust gas analysis %vol co2=3 h2o=6.5 n2=76 o2=14.5 % rel humidity=. firing temperature=1340 fuel input=- |
fuel analysis
% vol methane=90 ethane=3 propane=2.5 carb diox=2.5 nitrogen=2 augmenting air flow=. augmenting air temp=. |
| Project-study
units-British
exhaust gas/air flow-lb/h=127000 exhaust temp-F=900 tot gas flow-lb/h=127864 firing temp-F=1340 burner fuel-MM Btu/h=16.76 % vol co2=3 h2o=6.5 n2=76 o2=14.5 so2=. (before burner) % vol co2=4.08 h2o=8.5 n2=75.18 o2=12.19 so2=. (after burner) ______________________________________________ Fuel- gas - % volume methane 90 ethane 3 propane 2.5 carb dioxide 2.5 nitrogen 2 LHV-Btu/cuft = 931 HHV-Btu/cuft = 1030 LHV-Btu/lb =19396 HHV-Btu/lb = 21523 fuel flow-lb/h = 864 |
V.Ganapathy
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