Numerical analysis of membrane–absorption separation for supercritical carbon dioxide and water mixture of plume geothermal power generation systems

Qiao, Zongliang; Cao, Yue; Tang, Youfei; Si, Fengqi

doi:10.1016/j.enconman.2020.112609

Cited by 9 publications

(6 citation statements)

References 40 publications

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“…The selected simulation object is shown in Figure 3b. The crosssection of the separation unit of each membrane tube is regarded as a regular hexagon [12]. According to the number of membrane tubes arranged in this section, it can calculate the size of the hexagon.…”

Section: Design Of Membrane Separatormentioning

confidence: 99%

“…Membrane-absorption separation technology combines membrane separation with physical absorption, which is considered a better choice. The membrane absorption process is shown in Figure 2 [12]. It uses a microporous membrane as the mass transfer platform, takes the membrane as a mass transfer site without selectivity, and uses physical absorption to solve the problem of excessive pressure difference on both sides of the mem- Membrane-absorption separation technology combines membrane separation with physical absorption, which is considered a better choice.…”

Section: Introductionmentioning

confidence: 99%

“…It uses a microporous membrane as the mass transfer platform, takes the membrane as a mass transfer site without selectivity, and uses physical absorption to solve the problem of excessive pressure difference on both sides of the mem- Membrane-absorption separation technology combines membrane separation with physical absorption, which is considered a better choice. The membrane absorption process is shown in Figure 2 [12]. It uses a microporous membrane as the mass transfer platform, takes the membrane as a mass transfer site without selectivity, and uses physical absorption to solve the problem of excessive pressure difference on both sides of the membrane.…”

Section: Introductionmentioning

confidence: 99%

“…To sum up, many experiments and simulation studies on membrane absorption and separation are currently carried out, but the object is mixed gas or atmospheric wet air. To the best of the authors' knowledge, there have been no studies on the separation of sCO 2 -H 2 O mixtures at high temperatures and pressures so far, except for some studies conducted by the authors' team [12]. It is valuable to study further membrane separation to improve the economics of the process.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Membrane Separation Characteristics of Supercritical Carbon Dioxide and Water

Qiao,

Pan,

Tang

et al. 2023

Membranes

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To solve the problem of water carryover in the supercritical CO2 separation and mining process in the CO2 plume geothermal system, a three-dimensional shell-tube hollow fiber membrane absorption separator is designed in this study. A coupled species transport model, a porous medium model, and an absorption mathematical model are established, and the flow field and separation characteristics in the circular and flat tubes are analyzed using numerical simulation. The results show that the membrane separation efficiency increases with an increase in the flatness and membrane tube length. When the inlet velocity of the mixture is 0.1 m/s, the separation efficiency can reach 75.92%. Selecting a smaller flow Reynolds number and a more significant membrane tube flatness will reduce the water mass fraction at the outlet. When adding baffles of different shapes to the membrane tube, the mixture fluid in the membrane tube meanders forward and flows in the shape of “Z” under the blocking effect of the arcuate baffles. With an increase in the number of arcuate baffles in the membrane tube, the membrane separation efficiency of the separator increases continuously. The mixture fluid flows in the membrane tube with the built-in torsional baffles in a spiral manner, and the separation efficiency of the membrane separator increases with a torsion ratio reduction in the membrane tube.

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Section: Design Of Membrane Separatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Simulation of Membrane Separation Characteristics of Supercritical Carbon Dioxide and Water

Qiao,

Pan,

Tang

et al. 2023

Membranes

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“…The permeate flow rate increased in direct proportion to the increase in fiber inner diameter. Qiao et al [30] numerically analyzed the separation of the supercritical CO 2 -water mixture using an HFMC unit. The results obtained by Fluent software indicated that higher absorb efficiency can be induced by lower mixture inlet velocity and higher solution concentration.…”

Section: Introductionmentioning

confidence: 99%

Effects of Operating and Structural Parameters on Removal of Nitric Oxide by Oxidation in a Ceramic Hollow Fiber Membrane Contactor

Yuan

2021

Membranes

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A numerical study on the oxidation removal of nitric oxide in a ceramic hollow fiber membrane contactor was performed. To represent the transport and absorption process, the model was created by combining multiphase, species, reaction, and porous models. The numerical results were verified by comparing them with experimental data. The tube and lumen sides both have laminar parabolic velocity distributions. The nitric oxide concentration decreases gradually from the membrane wall to axis at the cross-section except on the inner and outer sides of the membrane tube. The equivalent diffusion length was proved useful for evaluating the entrance effect. At low concentrations, the reduction efficiency was proportional to the absorbent concentration, and at large concentrations, it neared a maximum value. The reduction efficiency was positively affected by elevated operating temperature and pressure. With a gas channel width of 13 mm, the reduction flow rate achieves its maximum. The efficiency of NO reduction per area decreases as the effective membrane length increases. Increasing the operating temperature and membrane length are recommended as design priorities due to high relative enhancements. It is not recommended to improve reduction efficiency by increasing membrane tube diameter and operating pressure in design. Changing the gas flow rate, absorbent concentration and gas channel width are moderate recommended as well.

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Density and Viscosity of Polyethylene Glycol 400 + 1,2-Propanediamine Binary Mixtures at T = (293.15–318.15) K and Spectral Analysis

Xing

et al. 2023

J Solution Chem

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Numerical analysis of membrane–absorption separation for supercritical carbon dioxide and water mixture of plume geothermal power generation systems

Cited by 9 publications

References 40 publications

Numerical Simulation of Membrane Separation Characteristics of Supercritical Carbon Dioxide and Water

Numerical Simulation of Membrane Separation Characteristics of Supercritical Carbon Dioxide and Water

Effects of Operating and Structural Parameters on Removal of Nitric Oxide by Oxidation in a Ceramic Hollow Fiber Membrane Contactor

Density and Viscosity of Polyethylene Glycol 400 + 1,2-Propanediamine Binary Mixtures at T = (293.15–318.15) K and Spectral Analysis

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