Numerical analysis of separation performance of an axial-flow cyclone for supercritical CO2-water separation in CO2 plume geothermal systems

Tang, Youfei; Qiao, Zongliang; Cao, Yue; Si, Fengqi; Romero, Carlos E.; Rubio-Maya, Carlos

doi:10.1016/j.seppur.2020.116999

Cited by 21 publications

(4 citation statements)

References 36 publications

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“…Li et al [14] used a mixture of supercritical water and s-CO 2 as the working medium and found that a significant increase in the pressure drop would occur with the rise in the content of s-CO 2 at the inlet. Tang et al [15] improved the axial-flow cyclone to realize the separation of gas-liquid phases of supercritical CO 2 and water. It can be found that very few attempts have been focused on cyclone separators using pure s-CO 2 as the carrier phase, and it remains unclear how traditional air cyclone separators' structure and operating parameters would perform when applied to s-CO 2 .…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Numerical Study on the Performance of Cyclone Separators in Supercritical CO2 Solar Power Plants

Li,

Zhu,

Liu

et al. 2023

Processes

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A combined approach of computational fluid dynamics, the discrete phase model, and the wall erosion model was used to numerically investigate the hydrodynamics, separation efficiency, and erosion rate in cyclone separators for s-CO2 solar power plants. Moreover, the results were compared with those for air and CO2 as carrier phases. The experimental data from the literature were used to validate the numerical model, and it was observed that the simulated gas velocities and wall erosion rate accurately aligned with the experimental measurements. The numerical results reveal that s-CO2 had the largest tangential velocity compared to the other two media; its area-weighted axial velocity of upward flow was the lowest in the middle part of the cyclone body, and varied considerably in the bottom region of the conical section. The particles were all collected at the bottom surface of air and CO2, but the separation efficiency of s-CO2 was 81.51%, due to the poor distribution of the vortex and short circuit. Finally, the erosion rate distribution and averaged surface erosion rate were also analyzed for the three carrier phases.

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Section: Introductionmentioning

confidence: 99%

A Preliminary Numerical Study on the Performance of Cyclone Separators in Supercritical CO2 Solar Power Plants

Li,

Zhu,

Liu

et al. 2023

Processes

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“…These studies show that the blade parameters are crucial items for enhancing the performance of the axial cyclone tube. And Tang et al 18 prevent a study for this tube, which is mainly aimed at the appraisal of blade outlet angle and blade numbers. It can be obtained that the blade is the most influential factor on cyclone flow and performance.…”

Section: Introductionmentioning

confidence: 99%

“…23,24 The velocity and pressure fields are regarded as the main items to analyze flow state in the separators. [12][13][14][15][16][17][18][19][20][21][22][23][24] Besides, the experimental study shows that the swirl number is also a crucial criteria judgment for the swirling intensity. 25 Here, it is important to summarize that the outlet angle of the guide vane is always seen as a single parameter in the previous studies.…”

Section: Introductionmentioning

confidence: 99%

The multi‐objective optimization of an axial cyclone separator in the gas turbine

Xing

Zhang

et al. 2021

Intl J of Energy Research

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Herein the multi-objective optimization of an axial cyclone separator is performed to enhance the overall performance with different velocities. And the separation efficiency and pressure drop are expected as the objective functions. In this paper, the difference value between internal and external blade outlet angles is regarded as one of the parameters to optimize. The regression expressions, which are obtained by Box-Behnken Design and the two-fluid model, are used in Nondominated Sorting Genetic Algorithm II to maximize separation efficiency and minimize pressure drop. It is found that the separation efficiency has a peak value with the rise of inlet velocity, and the response degrees of the internal angle, difference of the two angles, and blade number is disparate at different velocities. The pressure drops of the optimal axial cyclone tubes are smaller than the initial ones, but the separation efficiency is almost the same. Meanwhile, the accuracies of the optimization and numerical results are verified by the experiments. For the samples in 3, 5, and 7 m/s, pressure drop can be reduced by 24.1%, 22.7%, and 34.3% respectively. The simulation results indicate that the radial pressure difference and swirl number have been reduced. Besides, the optimal designs have more stable and even near wall particle distribution after multi-objective optimization.

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“…Scholars at home and abroad have conducted a lot of research on the geothermal energy technology in recent years, but there are still a number of problems demanding prompt solutions, such as the thermal pollution in recharges with large temperature differences, the incomplete recharge of groundwater flow and the interferences between heat outlets [22][23][24][25]. The changes in the temperature of geothermal fluids greatly affect the physical, chemical and biological evolution of groundwater flow and even the water quality.…”

Section: Introductionmentioning

confidence: 99%

On the Influencing Mechanism of Geothermal Fluids on the Dynamic Changes of Groundwater Flow and Heat Transfer Temperature

Bo¹,

Cheng²,

Sun³

2021

IJHT

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Nowadays, people are paying increasing attention to the rational exploitation of geothermal resources. To develop and utilize geothermal resources in a scientific way, it is important to understand the change patterns of key geohydrological parameters such as seepage velocity and temperature. As part of the effort, this paper analyzes and studies the influencing mechanism of geothermal fluids on the dynamic changes of groundwater flow and heat transfer temperature. First, a differential equation of heat conduction of geothermal fluids and a groundwater flow-geothermal fluids thermal coupling model were constructed to study the seepage state and the heat transfer of groundwater flow in the energy extraction process. Then, an analytical model for the influence of groundwater seepage on heat transfixion was established, directly showing the relevant mechanism. The experimental results proved the effectiveness of the constructed model.

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Numerical analysis of separation performance of an axial-flow cyclone for supercritical CO2-water separation in CO2 plume geothermal systems

Cited by 21 publications

References 36 publications

A Preliminary Numerical Study on the Performance of Cyclone Separators in Supercritical CO2 Solar Power Plants

A Preliminary Numerical Study on the Performance of Cyclone Separators in Supercritical CO2 Solar Power Plants

The multi‐objective optimization of an axial cyclone separator in the gas turbine

On the Influencing Mechanism of Geothermal Fluids on the Dynamic Changes of Groundwater Flow and Heat Transfer Temperature

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