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Executive Summary Introduction: We explore the pairing of an integrated gasification combined cycle (IGCC) plant with an engineered geothermal system using supercritical CO2 as the circulating fluid (scCO2-EGS) and located near Albuquerque, NM. The IGCC plant generates electricity from the gasification of coal and the burning of the resulting hydrogen. Terminal effluents are water from the combustion of hydrogen and a pure stream of CO2 that is consumed as make-up heat transfer fluid for the scCO2-EGS. This pairing of IGCC-scCO2-EGS reduces water use, utilizes and partially sequesters byproduct scCO2 and overall has reduced emissions and environmental impact in the closed-cycle system. Overview of Region: The proposed scCO2-EGS site is located in the Rio Grande Rift Basin that stretches from south central Colorado into Mexico. The basin traverses a semi- arid region of scarce water resources with a broadly distributed rural population that also concentrates into a few large population centers – most notably Albuquerque. The rift represents a region of higher than average heat flow with geothermal gradients reaching 39oC/km. Fractured crystalline basement rocks exist at depths of 2 to 7 kilometers beneath the rift-filling sediments and older Mesozoic and Paleozoic formations. We explore the design of a coupled scCO2-EGS and IGCC system close to the power utilization center of Albuquerque, NM, pairing these energy conversion methods through the CO2 effluent of the IGCC as the heat-transfer fluid of the scCO2-EGS. Technical Considerations - EGS: The EGS reservoir will be developed in basement rocks at a depth of 3.5 km approximately 8 km to the southeast of Albuquerque. This location provides shallow access to the crystalline basement rocks as confirmed by the adjacent hydrocarbon exploration well, TransOcean Isleta 1, with an anticipated reservoir temperature of 200 oC. The EGS reservoir will be developed using a 5-spot pattern with an injector-producer separation of 500 m and with scCO2 as the heat transfer fluid. For an assumed fracture spacing of the order of 10m and with single-well injection rates of 100 kg/s the time to 50% thermal drawdown in the reservoir is of the order of 30 years, and triple-that for more widely spaced fractures. For an injection-recovery temperature differential of 60C-200C then a circulation rate of 100 kg/s results in a thermal power output of 19 MW-thermal (per injector-withdrawal doublet of 100 kg/s). The scCO2 production from the IGCC supplies the make-up fluid to compensate from leak-off losses in the EGS. For anticipated fluid losses of 5-10% the 80 kg/s output from the IGCC translates to 800-1600 kg/s overall flow rate distributed in 8-16 injectors each of ~100 kg/s. This translates to projected outputs from the EGS of the order of 150-300 MW- thermal that may decline to half of these values after 30 years. iPDF Image | GREAT NECK WATER POLLUTION CONTROL DISTRICT NASSAU COUNTY, NEW YORK MICROTURBINE INSTALLATION FEASIBILITY STUDY
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