Download User Manual: Integrated Environmental Control Model

Variable Cost Components
Variable operating costs and consumables are directly proportional to the amount of
kilowatts produced and are referred to as incremental costs. All the costs are subject
to inflation.
Reagent: Annual cost of lime or limestone injected into the scrubber on a
wet basis. This is a function of the SO2 concentration in the flue gas
and the reagent stoichiometric performance input value.
Steam: Annual cost of steam used for direct or reheat use in the scrubber.
This is a function of the steam heat rate, reheat energy requirement, and
gross plant capacity.
Solid Waste Disposal: Total cost to dispose the collected flue gas waste
solids. This does not consider by-product gypsum sold in commerce.
Power: Cost of power consumption of the scrubber. This is a function of
the gross plant capacity and the scrubber energy penalty performance
input parameter.
Water: Cost of water for reagent sluice in the scrubber. This is a function
of the liquid to gas ratio performance input parameter for the wet FGD.
The cost is a function of the flue gas flow rate and the slurry recycle
ratio performance input parameter for the spray dryer.
Total Variable Costs: This is the sum of all the variable O&M costs
listed above. This result is highlighted in yellow.
Fixed Cost Components
Fixed operating costs are essentially independent of actual capacity factor, number of
hours of operation, or amount of kilowatts produced. All the costs are subject to
inflation.
Operating Labor: Operating labor cost is based on the operating labor
rate, the number of personnel required to operate the plant per eighthour shift, and the average number of shifts per day over 40 hours per
week and 52 weeks.
Maintenance Labor: The maintenance labor is determined as a fraction
of the total maintenance cost.
Maintenance Material: The cost of maintenance material is the
remainder of the total maintenance cost, considering the fraction
associated with maintenance labor.
Admin. & Support Labor: The administrative and support labor is the
only overhead charge. It is taken as a fraction of the total operating and
maintenance labor costs.
Total Fixed Costs: This is the sum of all the fixed O&M costs listed
above. This result is highlighted in yellow.
Total O&M Costs: This is the sum of the total variable and total fixed
O&M costs. It is used to determine the base plant total revenue
requirement. This result is highlighted in yellow.
234 • Spray Dryer
Integrated Environmental Control Model User Manual