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VOMinhibitor = 0.2 VOMMEA Cost of other reagents (VOMreagents): The cost of other reagents, such as, caustic and activated carbon are also calculated from their physical quantities estimated in the performance model and the unit costs of these reagents. VOMreagents = VOMCaustic + VOMact-C = {(mCaustic UCCaustic) + (mact-C UCact-C)} HPY where UCCaustic and UCact-C are the unit costs of the reagents caustic and activated carbon, respectively. Cost of waste disposal (VOMwaste): Another important variable operating cost item is the cost incurred in proper disposal of the spent sorbent i.e. the reclaimer waste, again the quantity estimated in the performance model. VOMwaste = Mwaste,total UCwaste HPY where, UCwaste is the unit cost of waste disposal for the reclaimer waste. Cost of CO2 transport (VOMtransport): Transportation of CO2 product is assumed to take place via pipelines. The cost of CO2 transport is estimated on the basis of two user specified parameters, viz., transportation distance (TD, in km) and unit cost of transport (UCtransport, $/km mton CO2), and CO2 product flow rate (calculated result from performance model). VOMtransport = MCO2 UCtransport TD HPY Cost of CO2 disposal (VOMdisposal): Depending upon the method of CO2 disposal or storage, either there may be some revenue generated (Enhanced Oil Recovery, Coal Bed Methane) which may be treated as a “negative cost”, or additional cost (all other disposal methods). The total cost or revenue of CO2 disposal/ storage is estimated from the unit cost and CO2 product flow rate (UCdisp). VOMdisposal = MCO2 UCdisp HPY Cost of energy (VOMenergy): By default, the energy costs are handled internally in the model by de-rating the overall power plant based on the calculated power requirement. This increases the cost per net kilowatt-hour delivered by the plant. The CO2 capture unit is charged for the total electricity production foregone (energy penalty) because of capture and compression of CO2 from the flue gas, and the base plant is credited for the same. The unit cost of electricity (COEnoctl) is estimated by the base plant module, or maybe overridden by a user-specified value when this energy is supplied from an external source (in that case, no credit given to the base plant). Since energy cost is one of the biggest O&M cost items for CO2 unit, the way in which it is accounted for (internal de-rating or external provision) becomes very crucial while calculating the mitigation cost. VOMenergy = ECO2,tot HPY COEnoctl Alternatively, when regeneration steam is provided by an auxiliary NG boiler, the cost of energy maybe estimated from the total annualized cost of the new boiler and secondary steam turbine, which takes into account their capital cost requirement and cost of natural gas fuel. Cost of water (VOMwater): Water is mainly required for cooling and also as process makeup. Generally this is a minor cost item in the overall plant operation, but it is included over here for the sake of completeness. Also, it maybe noted that the unit cost of water (UCwater) may vary depending upon the location of the power plant. VOMwater = Mw UCwater HPY So, the total variable O&M (VOM, $/yr) cost is obtained by adding all these costs Integrated Environmental Control Model - Technical Documentation • 34PDF Image | Amine Based CO2 Capture
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