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.

scholarly journals The Effect of Polymerization Temperature on the Properties of Polyvinyl Fluoride Polymerization in Supercritical Carbon Dioxide

2021 ◽  
Vol 2101 (1) ◽  
pp. 012063
Author(s):  
Wei Liu ◽  
Yanzhong Zhang ◽  
Huaiyun Chang ◽  
Rong Cai ◽  
Peiliang Ma
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Reaction Medium ◽  
Chemical Processes ◽  
Light Transmittance ◽  
Polymerization Temperature ◽  
Irregular Structure ◽  
Lower Melting Point ◽  
Application Fields ◽  
Supercritical Carbon

Abstract The ongoing search for environmentally friendlier alternative to the organic solvents used in chemical processes has led to the development of technologies based on supercritical carbon dioxide (scCO2), which is non-flammable, non-toxic and relatively inert fluid. Polymer chemistry does not escape this trend. Fluoropolymers prepared in scCO2 have many special properties, which are different from fluoropolymers that use water as the reaction medium, this paper studies the effect of polymerization temperature on polyvinyl fluoride polymerization in supercritical carbon dioxide. The results show that as the polymerization temperature increases, the intrinsic viscosity and shear viscosity of the polymer gradually decreases; at the same time, the increasing of polymerization temperature leads to higher proportion of irregular structure of the polymer, which causes lower melting point and lower crystallinity, and the film prepared by the resin also exhibits a higher visible light transmittance. The above results show that the resin polymerized in supercritical carbon dioxide can impart better performance to conventional polymerization, which expands the potential application fields of the resin.

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

Dynamic model of a supercritical carbon dioxide heat exchanger

2005 ◽  
Vol 35 (2) ◽  
pp. 167-173 ◽  
Author(s):  
Pedro C. Simões ◽  
João Fernandes ◽  
José Paulo Mota
Keyword(s):  
Carbon Dioxide ◽  
Heat Exchanger ◽  
Supercritical Carbon Dioxide ◽  
Dynamic Model ◽  
Supercritical Carbon
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