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Carbon capture and storage is an important way to achieve the “dual-carbon” goal. The exhaust gas of the supercritical water-coal to hydrogen coupled CO2/H2O mixed working medium thermal power generation system is low pressure and low-temperature CO2/H2O mixed gas. In order to achieve zero carbon emission and heat recovery, condensation separation of CO2/H2O is a necessary way. Fluent is used to simulate the condensing heat transfer characteristics of CO2/H2O mixture outside the horizontal bifurcation tube bundle. The volume of fluid (VOF) model, the component transport model, and the phase transition model written by the user-defined functions (UDF) are employed to load the mass, energy, and component source terms of the two-phase flow. The formation and development process of the liquid film on the wall surface, and the distribution of streamlines, velocity vectors, and liquid-phase volume fractions in the vicinity of droplets, as well as the effects of velocity, vapor superheat, and noncondensable gas content on the heat transfer coefficients and the thermal resistance of the diffusion layer, are investigated. The results show that, the simulation results are in agreement with the experimental data, and the liquid film thermal resistance hardly varies with the steam superheat but decreases with the increase of CO2 content, inlet flow rate and total pressure. The thermal resistance of the mixed gas diffusion layer increases with the CO2 content and steam superheat, and decreases with the increase of inlet flow rate. The total heat transfer coefficient increases with the steam superheat, inlet flow rate and pressure, and decreases with the CO2 content, and the local condensation heat transfer coefficient is negatively correlated with the liquid film thickness. A new dimensionless correlation formula for heat and mass transfer of condensation is proposed for low pressure CO2/H2O condensation process.
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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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