PDF Publication Title:
Text from PDF Page: 002
CHAetal., DevelopmentofaSupercriticalCO2BraytonEnergyConversionSystemCoupledwithaSodiumCooledFastReactor in the Generation IV Nuclear Energy Systems Initiative (e.g., Sodium cooled Fast Reactor, Lead cooled Fast Reactor, Very High Temperature Reactor). KAERI has researched four major activities, separately. For the system development, computer codes were developed to calculate the heat balance of various power operation conditions in which all component models were incorporated. Based on the computer codes, the supercritical CO2 Brayton cycle energy conversion system was constructed for the sodium fast reactor concept, KALIMER-600 (pool type reactor, 600MWe). In order to develop the supercritical CO2 turbomachinery models, design codes for the turbomachinery, such as an axial turbine and a radial type compressor, were developed. Based on the design codes, the design parameters were prepared to configure the KALIMER-600 S-CO2 turbomachinery models. The models were evaluated by means of both expert consultations and thermo-hydraulic analysis with the help of a commercial CFD code. Through the models, off-design characteristics and the sensitivities of the supercritical CO2 turbomachinery were investigated. To enhance safety and economics, various kinds of heat exchangers were investigated. Since the Printed Circuit Heat ExchangerTM (PCHETM) [4] is the only compact exchanger that offers parent metal strength and properties throughout the entire exchanger owing to its diffusion bonding technology, the PCHE was selected for the supercritical CO2 Brayton cycle energy conversion system. For the evaluation of diffusion-bonded heat exchangers similar to PCHE models, a one-dimensional analysis computer code was developed to evaluate the performance of the heat exchangers and design data for the typical PCHE was produced. In parallel with the PCHE-type heat exchanger design, a diffusion-bonded airfoil shape fin heat exchanger has been newly designed. The new design concept was evaluated by three-dimensional CFD analyses, which have showed that the airfoil shape fin heat exchangers conserve the total heat transfer rate and reduce the pressure drop by a factor of 14. The diffusion-bonded airfoil shape fin heat exchanger has a special feature that could change fin density more freely in a fluid channel and control the thermo-hydraulic characteristics in the HX. Possible control schemes for power control in the KALIMER-600 supercritical CO2 Brayton cycle were investigated by using the MARS code. The MMS-LMR code was also developed to analyze the transient phenomena in an SFR with a supercritical CO2 Brayton cycle. The results of the MMS-LMR code were compared with the heat balance for the given component data and the MARS- LMR analysis results. A simple power/load reduction and recovery event was selected for the transient calculation. Then, the transient behavior was analyzed for the KALIMER- 600 supercritical CO2 Brayton cycle. The S-CO2 Brayton cycle energy conversion system coupled with an SFR is also very attractive from the aspect that it can achieve a more reliable system design completely free from the essential risk of the sodium- water reaction (SWR) phenomenon possibly occurring in a conventional Rankine cycle energy conversion system. Although this novel approach will yield significant improvements in overall plant energy utilization, it raises issues regarding the consequences of heat exchanger boundary failure, resulting in an intermixing of CO2 and liquid sodium. For the evaluation of the Na-CO2 boundary failure event, a computer code was developed to simulate the complex thermodynamic behaviors of the chemical reaction between liquid sodium and CO2 gas. The long term behavior of a Na-CO2 boundary failure event and its consequences, which lead to a system pressure transient, were evaluated for the shell-and-tube type Na-CO2 heat exchanger of the KALIMER-600 employing a supercritical CO2 Brayton cycle. This paper describes the current research status for a supercritical CO2 Brayton cycle coupled to the KALIMER- 600 as an alternative energy conversion system. 2. SUPERCRITICAL CO2 BRAYTON CYCLE ENERGY CONVERSION SYSTEM 2.1 Normal Operation Conditions of the KALIMER- 600 System In order to establish normal operating conditions for the KALIMER-600 supercritical CO2 Brayton cycle energy conversion system, two major codes were developed, namely the design computer codes ”DENOP” and “RECOBA”. The design code DENOP plays the role of calculating the heat balance between the primary heat transport system (PHTS) and the intermediate heat transport system (IHTS). The RECOBA code was used to calculate the heat balance of the S-CO2 Brayton cycle ECS, which was developed on the basis of references [1,5,6]. The properties of the S- CO2 were calculated by using the subroutine REPROP program of the NIST [7]. The recompression S-CO2 Brayton cycle, which has two compressors, was adopted to avoid the inverse temperature difference in the inlet of the compressor, which is due to a drastic variation of the specific heat of supercritical CO2 near the critical point. In the recompression Brayton cycle, the minimization of the discharged heat in the cooler can be achieved with a second compressor. Therefore, the split fraction of the flow is a significant design parameter. Two recuperators (i.e., regenerative heat exchangers) are used for the utilization of the remaining supercritical CO2 thermal energy in the cycle. The compressor inlet temperature is set to around 31.25 oC, near the critical point of CO2 (static pressure 7.377 MPa, static temperature 30.97 oC), for the maximization of the cycle efficiency [8]. Figure 1 shows normal operating conditions of the KALIMER-600 S-CO2 Brayton cycle 1026 NUCLEAR ENGINEERING AND TECHNOLOGY, VOL.41 NO.8 OCTOBER 2009PDF Image | DEVELOPMENT OF A SUPERCRITICAL CO2 BRAYTON ENERGY CONVERSION
PDF Search Title:
DEVELOPMENT OF A SUPERCRITICAL CO2 BRAYTON ENERGY CONVERSIONOriginal File Name Searched:
JK0411025.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 |