PDF Publication Title:
Text from PDF Page: 005
the reservoir. The geothermal fluid (CO2) is discharged from the heater (proxy geothermal reservoir) at 12 MPa and 300 C. It enters the heat exchanger which is modeled by a MHEATX model in ASPEN PLUS. The geothermal heat is transferred from CO2 to the working fluid. The CO2 is recompressed to 15 MPa and circulated back to the flow splitter inlet. CO2 lost in the sequestration process is compensated by the output from the IGCC plant (68 kg/s) so that a constant inlet flow rate of 680 kg/s can be maintained at the inlet of the flow splitter. In the first part of the study, a preheater was not used in the ORC. The working fluid is chosen to be in liquid state. It is com- pressed to high pressure with a pump. In the absence of the pre- heater, it directly enters the binary heat exchanger to absorb the geothermal heat from the CO2. The fluid passes completely to the vapor phase and the expansion of this fluid in the turbine to at- mospheric pressure produces electricity. The vapor at atmospheric pressure is fed to the condenser to change phase from vapor to liquid. The cold liquid at atmospheric pressure is recirculated back into the pump. The power generated in this cycle was studied as a function of the five different working fluids when the temperature of the geothermal fluid at the heat exchanger inlet was 300 C. The lowest possible temperature at which CO2 can be discharged from the heat exchanger was also studied. In the second part of the study, a preheater was used. The hot working fluid in the vapor phase leaving the turbine outlet enters the preheater to heat the cold but high pressure liquid leaving the pump before it enters the binary heat exchanger to absorb the geothermal heat from the CO2. The effect of the preheater in reducing the amount of energy wasted in condensation was studied for both neopentane and n-Butane. There are three constraints used in the modeling of the organic Rankine cycle. These are that: (i) there should not be any Table 3 Power output from EGS and efficiency of power generation from EGS for ammonia. Mass flow rate of working fluid ammonia 1⁄4 100 kg/s temperature crossover either in the binary heat exchanger or the preheater between the hot and the cold fluid, in other words, the temperature of the hot fluid is always greater than the temperature of the cold fluid from one end to the other end of the heat exchanger (ii) that the working fluid should completely be in the vapor phase at the turbine inlet, and, (iii) that the working fluid should completely be in the vapor phase during expansion in the turbine or at the turbine outlet. The inlet conditions used for the working fluid are shown in Tables 3e6. These conditions are chosen to meet all the modeling constraints. 5. Error analysis Based on the assumptions in Table 2, the ORC for the working fluids was modeled under specific conditions in ASPEN Plus. The results are reproducible under the same conditions. Therefore, er- ror analysis is impertinent in this study. 6. Results and discussion In the ORC, the pressure of the working fluid and its mass flow rate are the input conditions that determine the power output. The specific heat capacity and the thermodynamic properties of the working fluid determine the amount of power generated from the ORC for a certain amount of heat input. The amount of power generated, efficiency of power generation and the CO2 exit tem- perature are shown in Tables 3e6 for ammonia n-Butane, neo- pentane and R134A respectively. The first law efficiency is defined as the ratio of net power output generated in the ORC to the geothermal heat energy absorbed by the working fluid from CO2 in the binary heat exchanger. Author's personal copy 508 A. Ram Mohan et al. / Energy 57 (2013) 505e512 Fig. 2. Process modeling of organic Rankine cycle for producing electricity by EGS using CO2 as a geothermal fluid. Working fluid pressure (MPa) 0.5 1.0 2.5 3.0 4.0 Power generated (MWe) Exit 27.3 60 36.4 60 39.9 70 44.9 65 49 62 CO2 temperature ( C) Ammonia temperature in h% heat exchanger Tin,C Tout, 35 293 35 296 35 238 35 275 35 295 C 12.7 16.9 20.3 21.8 23.2PDF Image | Energy Technology ORC
PDF Search Title:
Energy Technology ORCOriginal File Name Searched:
2013_j_energy_sco2_egs_arun.pdfDIY PDF Search: Google It | Yahoo | Bing
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
Infinity Turbine ROT Radial Outflow Turbine 24 Design and Worldwide Rights: NFT for sale... NFT for the ROT 24 energy turbine. Be part of the future with this NFT. This design can be bought and sold but only one design NFT exists. You may manufacture the unit, or get the revenues from its sale from Infinity Turbine. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Supercritical CO2 10 Liter Extractor Design and Worldwide Rights: The Infinity Supercritical 10L CO2 extractor is for botanical oil extraction, which is rich in terpenes and can produce shelf ready full spectrum oil. With over 5 years of development, this industry leader mature extractor machine has been sold since 2015 and is part of many profitable businesses. The process can also be used for electrowinning, e-waste recycling, and lithium battery recycling, gold mining electronic wastes, precious metals. CO2 can also be used in a reverse fuel cell with nafion to make a gas-to-liquids fuel, such as methanol, ethanol and butanol or ethylene. Supercritical CO2 has also been used for treating nafion to make it more effective catalyst. This NFT is for the purchase of worldwide rights which includes the design. More Info
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
Infinity Turbine Products: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. May pay by Bitcoin or other Crypto. Products Page... More Info
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |