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Supercritical carbon dioxide (S-CO2) power generation technology offers better flexibility, and its substitution for steam power generation technology in the field of thermal power generation is of significant strategic importance for constructing a new type of power system, establishing a modern energy system, and achieving the “dual carbon” goal. Through numerical simulation and experiment, the flow and heat transfer characteristics of S-CO2 boilers within the actual operating range are analyzed, and the influence of working fluid flow states and physical properties on heat transfer and resistance performance is also investigated. The results show that, the heat transfer coefficient of CO2 decreases with the thermal conductivity under the same flow conditions. This is because the thermal resistance of the fluid boundary layer increases as the thermal conductivity decreases. Under the same thermal conductivity conditions, the heat transfer coefficient of CO2 increases with the Reynolds number (Re). The reason is that the fluid boundary layer becomes thinner as Re increases, reducing the boundary layer thermal resistance. For CO2 working fluid inside the pipe with pressures ranging from 3 MPa to 30 MPa, enthalpy values of 500~1 150 kJ/kg, and Re between 1.1×105 and 2.1×106, a correlation formula for heat transfer considering boundary layer property corrections is derived. The average deviations are 3.33%, demonstrating it has high precision. The research lays a solid foundation for the design and research of subsequent S-CO2 boilers.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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