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Chapter 7 Energy Conversion Systems – Options and Issues Table 7.5 Results for thermodynamically optimized single and doubleflash plants. Geofluid Energy Separator Flash Specific turbine temp., conversion temp., °C temp., °C power, kW/(kg/s) Mass flow rate in kg/s needed for °C system 200 Singleflash 121 N.A. 53.9 19.5 195.2 975.9 250 Doubleflash 185 122 123.5 8.52 85.2 426.2 1 10 50 MW MW MW (74) where C is in $/kW and is the unit capacity in MW. This formula was calibrated at $2,500/kW for a 5 MW plant and $1,618/kW for a 150 MW plant, the largest size considered in Sanyal’s study. 713 It should be recognized that the maximum reasonably sustainable mass flow rates from EGS reservoirs todate have been in the neighborhood of 2022 kg/s. This would be sufficient to generate 1 MW from a 200°C fluid, and about 2.4 MW from a 250°C fluid. Estimated power plant costs for 1 and 2flash systems. In this section, we estimate the cost to install plants of the 1 and 2flash type for use at EGS resources. The costs are based on the work of Sanyal (2005). He postulated that the cost of a power plant (including the cost of the initial wells and associated piping gathering system, but not replacement wells) would follow an exponentially declining curve as the capacity of the power unit increases. His cost equation is: Our purpose is somewhat different in that we want to estimate the cost of power units when several of them will be constructed in a large EGS field. Thus, we need to account for both economy of scale (i.e., largersize plants will be less expensive, per kW, than smaller ones) and a learning curve (i.e., the unit cost of many units of identical design will be less than a oneoff designed plant). We expect that a lower cost limit will be reached, for which the cost of a plant will remain constant no matter the size of a given unit or the number of common units constructed. One other important difference exists in our case: We need the cost of the power plant alone because the well and field costs to create an EGS reservoir will be estimated separately in this report. To this end, we have assumed that 75% of the total cost from Eq. (74) is for the plant itself. Given the current uncertainty in estimating the cost to create an EGS reservoir, we believe this percentage is a reasonable estimate for the present purpose.PDF Image | Energy Conversion Systems
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