scholarly journals COmpatibility of polymers in supercritical carbon dioxide for power generation.

2019 ◽  
Author(s):  
Nalini Chulliyil Menon ◽  
Walker Mathew ◽  
Anderson ◽  
Nathan- x Colgan
Keyword(s):  
Carbon Dioxide ◽  
Power Generation ◽  
Supercritical Carbon Dioxide ◽  
Compatibility Of Polymers ◽  
Supercritical Carbon

Supercritical Carbon Dioxide Turbomachinery Options for Kilowatt to Gigawatt Level Power Generation

2019 ◽  
Author(s):  
Lakshminarayanan Seshadri ◽  
Harini Nivetha Raja ◽  
Pramod Kumar ◽  
Abdul Nassar ◽  
Gaurav Giri ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Power Generation ◽  
Supercritical Carbon Dioxide ◽  
Thermodynamic Cycle ◽  
Design Tool ◽  
Shaft Speed ◽  
Design Features ◽  
Analysis And Design ◽  
Axial Turbines ◽  
Supercritical Carbon

Abstract Supercritical Carbon Dioxide Brayton cycles can be used in conjunction with a host of heat sources associated with different magnitudes of net power generation. In this paper, the overall design features of the turbomachinery, namely the turbine and compressor are evaluated for kilowatt to Gigawatt range of net cycle power using a commercial design tool — AxSTREAM®. The thermodynamic cycle considered in all cases is a simple recuperated Brayton cycle with turbine and compressor inlet temperatures of 540 °C and 45 °C respectively. The highest and lowest pressures in the cycle are 210 bar and 85 bar respectively. The preliminary design is carried out using an inverse algorithm with a meanline solver that generates many geometries for the given boundary conditions using standard loss correlations to account for different losses in turbomachines. It, thus, provides the general design features of the compressor and turbine which include — machine size, shaft speed at design point, overall efficiency, number of blades, blade heights, blade angles and number of stages for axial turbines. The choice of axial or radial impeller and initial estimates of machine size and shaft speed are made based on standard specific speed-specific diameter charts and important loss parameters are presented for each case. This study serves as a first step towards in-depth blade profiling, 3-D analysis and design of the turbomachinery required to bring this technology to the practical realm.

Supercritical carbon dioxide cycles for power generation: A review

2017 ◽  
Vol 195 ◽  
pp. 152-183 ◽  
Author(s):  
Francesco Crespi ◽  
Giacomo Gavagnin ◽  
David Sánchez ◽  
Gonzalo S. Martínez
Keyword(s):  
Carbon Dioxide ◽  
Power Generation ◽  
Supercritical Carbon Dioxide ◽  
Supercritical Carbon

scholarly journals Research on Dynamic Modeling of the Supercritical Carbon Dioxide Power Cycle

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1946
Author(s):  
Ping Song ◽  
Zhenxing Zhao ◽  
Lie Chen ◽  
Chunhui Dai ◽  
Chonghai Huang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Power Generation ◽  
Supercritical Carbon Dioxide ◽  
Dynamic Model ◽  
Dynamic Performance ◽  
Maximum Error ◽  
Application Fields ◽  
And Control ◽  
Recompression Cycle ◽  
Supercritical Carbon

The supercritical carbon dioxide (SCO2) Brayton cycle, as a substitute for the steam cycle, can be widely used in a variety of power generation scenarios. However, most of the existing SCO2 cycle studies are restricted to basic thermodynamics research, parameter optimizations, system design in different application fields, and even economic analysis. Considering the load variability and control flexibility of the power generation system, the dynamic performance research of the SCO2 cycle is also crucial, but the work done is still limited. Based on the previous studies, Simulink software is used in this paper to develop a dynamic model of the 20 MW-SCO2 recompression cycle, which specifically includes component models that can independently realize physical functions and an overall closed-loop cycle model. A series of comparative calculation are carried out to verify the models and the results are very positive. The SCO2 recompression power system is built with the developed models and the dynamic model runs stably with a maximum error of 0.56%. Finally, the simulation of the dynamic switching conditions of the 20 MW-SCO2 recompression cycle are performed and the analysis results supply instructive suggestions for the system operation and control.

Comparison of Supercritical Carbon Dioxide Cycles for Oxy-Combustion

2015 ◽  
Author(s):  
Aaron McClung ◽  
Klaus Brun ◽  
Jacob Delimont
Keyword(s):  
Carbon Dioxide ◽  
Power Generation ◽  
Natural Gas ◽  
Supercritical Carbon Dioxide ◽  
Carbon Capture ◽  
Working Fluid ◽  
Southwest Research Institute ◽  
Turbine Inlet ◽  
Supercritical Carbon ◽  
Research Institute

Advanced oxy-combustion coupled with supercritical carbon dioxide (sCO2) power cycles offers a path to achieve efficient power generation with integrated carbon capture for base load power generation. One commonality among high efficiency sCO2 cycles is the extensive use of recuperation within the cycle. This high degree of recuperation results in high temperatures at the thermal input device and a smaller temperature rise to the turbine inlet. When combined with typical high side pressures ranging from 150 to 300 bar, these conditions pose a non-trivial challenge for fossil fired sCO2 cycles with respect to cycle layout and thermal integration. A narrow thermal input window can be tolerated for indirect cycles such as those used for nuclear power generation and concentrating solar power plants, however, it is at odds with traditional coal or natural gas fired Rankine cycles where the working fluid has been condensed and cooled to near ambient temperatures. Coal fired sCO2 cycles using oxy-combustion have been examined by Southwest Research Institute and Thar Energy L.L.C. under DOE award DE-FE0009593. Under this project, an indirect supercritical oxy-combustion cycle was developed that provides 99% carbon capture with a 37.9% HHV plant efficiency. This cycle achieves a predicted COE of $121/MWe with no credits taken for the additional 9% of carbon capture, and represents a 21% reduction in cost as compared to supercritical steam with 90% carbon capture ($137/MWe). Direct fired sCO2 cycles for natural gas or syngas are currently being evaluated by Southwest Research Institute and Thar Energy L.L.C. under DOE award DE-FE0024041. Initial evaluations of direct fired supercritical oxy-combustion cycles indicate that plant efficiencies on the order of 51% to 54% can be achieved with direct fired natural gas oxy-combustion when paired with the recompression cycle with 1,200 °C firing temperatures at 200 bar. Direct fired natural gas or syngas sCO2 cycles still face significant technology development needs, with the pressurized oxy-combustor a significant component with a low Technology Readiness Level, (TRL) as defined by the DOE. In addition to the combustion system, significant work will be required to prepare the sCO2 turbomachinery for the turbine inlet temperatures required to achieve plant efficiencies greater than 50%.

scholarly journals Influence of Supercritical Carbon Dioxide Brayton Cycle Parameters on Intelligent Circulation System and Its Optimization Strategy

2021 ◽  
Vol 2066 (1) ◽  
pp. 012074
Author(s):  
Kai Li ◽  
Kai Sun
Keyword(s):  
Carbon Dioxide ◽  
Power Generation ◽  
Supercritical Carbon Dioxide ◽  
Circulation System ◽  
Inlet Temperature ◽  
Brayton Cycle ◽  
Optimization Strategy ◽  
Cycle System ◽  
The Impact ◽  
Supercritical Carbon

Abstract The supercritical carbon dioxide (SCO2) Brayton cycle takes advantage of the special physical properties of carbon dioxide near the critical point (31.1 °C, 7.39MPa), and has higher energy conversion efficiency than the current large-scale steam power cycle. This cycle can be widely used in the field of power generation, but a lot of research work is still needed in terms of component parameters and layout under different working conditions. In this regard, the purpose of this paper is to study the influence of supercritical carbon dioxide Brayton cycle parameters on cycle efficiency and its optimization strategy. Based on the first law of thermodynamics, this paper uses Aspen Plus software to establish S-CO2 Brayton cycle system models with different circulation arrangements. In this paper, the existing algorithm of the simulation system and the newly-built algorithm are used to build the S-CO2 shunt and recompression Brayton cycle system model, and the accuracy of the model is verified with experimental data from literature. Then this paper conducts disturbance experiments on the model to study the influence of heater heating, valve opening and precooler cooling on the system, and analyze the dynamic characteristics of the system. Experimental results show that the thermal efficiency of the simple Brayton cycle is much lower than that of the recompression Brayton cycle and the split recompression Brayton cycle under higher parameters. The compressor outlet pressure and the turbine inlet temperature have an effect on the efficiency of the recompression Brayton cycle. The impact is significant, and the optimal value of the compressor shunt coefficient is between 0.5-0.7, which provides a reference for the layout optimization method of the SCO2 Brayton cycle and the optimization of the same type of power generation cycle.

Sign in / Sign up

Export Citation Format

Share Document