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pressure conditions found in this system. The actual cost of the unit is estimated on the basis of the cost information available for a particular reference case study using 0.6 power law for scaling purposes. V 0.6 CcrossHEx = CcrossHEx, ref solvent Vsolvent,ref Regenerator: This is the column where the CO2-loaded solvent is regenerated with the application of heat. Solvent flow rate is the main physical quantity that decides the size (and cost) of this unit, for a given residence time (which is a function of many parameters including the solvent concentration, desired CO2 capture efficiency, etc.). So, the cost maybe estimated using as above V 0.6 Cregenerator = Cregenerator, ref solvent Vsolvent,ref Reboiler: The regenerator is connected with a reboiler, which is basically a heat exchanger where low- pressure steam extracted from the power plant is used to heat the loaded solvent. So, the size (and cost) of this unit is a function of mainly the flow rate of the solvent as well as the flow rate of steam. The actual cost of the unit is estimated on the basis of the cost information available for a particular reference case study using 0.6 power law for scaling purposes. V M0.6 Creboiler = Creboiler, ref solvent steam Vsolvent,ref Msteam,ref It maybe noted that the ratio of mass flow rates of LP steam (Msteam/ Msteam,ref) has been used in place of the ratio of volumetric flow rates of LP steam, assuming that the temperature and pressure conditions of the LP steam in both cases (actual and reference) are almost identical. Steam extractor: Steam extractors are installed to take out LP/IPsteam from the steam turbines in the power plant. The size (and the cost) of the steam extractor is assumed to be a function of the steam flow rate. M 0.6 Csteam _ extractor = Csteam_extractor, ref steam Msteam,ref This cost item is included if the CO2 capture system is configured to make use of steam extracted from the steam cycle of the base plant. Alternatively, an auxiliary NG boiler and a secondary steam turbine maybe used, and the next two cost items (8 and 9) are included in its place. Auxiliary boiler: The cost of the NG boiler is estimated on the basis of the (no reheat) steam flow rate generated from the boiler. The following cost estimation formula was reported by Dale Simbeck CNG_boiler = $15*(steam flow rate expressed in lb/hr) Since the steam flow rate (msteam) was estimated as tonnes/hr, the following expression maybe obtained after accounting for the unit conversions CNG_boiler = $33000*(msteam) Secondary steam turbine: The cost of the secondary steam turbine is estimated on the basis of the electrical power generated from this new turbine. The following cost estimation formula was reported by Dale Simbeck CST2 = $300*(power generation expressed in kWe) Integrated Environmental Control Model - Technical Documentation • 31PDF Image | Amine Based CO2 Capture
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