A novel concept of enhanced direct-contact condensation of vapour- inert gas mixture in a spray ejector condenser

Mikielewicz, Dariusz; Amiri, Milad; Klugmann, Michał; Mikielewicz, Jarosław

doi:10.1016/j.ijheatmasstransfer.2023.124576

Cited by 9 publications

(1 citation statement)

References 20 publications

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“…A separate issue that requires thorough analysis is the presence of inert gases and their influence on the effectiveness of the condensation. Based on the results from analytical modelling, Mikielewicz et al [42] showed that the presence of inert gases causes a weaker condensation process. Wang et al [43] conducted an experimental study on the condensation of steam with various mass contents of the air and the results showed that the heat transfer coefficient was decreasing with an increase in the inert gas content.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of a Two-Phase Ejector Operation Taking into Account Steam Condensation with the Presence of CO2

Kuś,

Madejski

2024

Energies

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The application of a two-phase ejector allows for the mixing of liquid and gas and provides effective heat transfer between phases. The aim of the study is a numerical investigation of the performance of a water-driven, condensing two-phase ejector. The research was performed using CFD methods, which can provide an opportunity to analyze this complex phenomenon in 2D or 3D. The 2D axisymmetric model was developed using CFD software Siemens StarCCM+ 2022.1.1. The Reynolds-Averaged Navier–Stokes (RANS) approach with the Realisable k-ε turbulence model was applied. The multiphase flow was calculated using the mixture model. The boiling/condensation model, where the condensation rate is limited by thermal diffusion, was applied to take into account direct contact condensation. Based on the mass balance calculations and developed pressure and steam volume fraction distributions, the ejector performance was analyzed for various boundary conditions. The influence of the suction pressure (range between 0.812 and 0.90) and the steam mass flow rate (range between 10 g/s and 25 g/s) is presented to investigate the steam condensation phenomenon inside the ejector condenser. The provided mixture of inert gas (CO2) with steam (H2O) in the ejector condenser was investigated also. The weakening of the steam condensation process by adding CO2 gas was observed, but it is still possible to achieve effective condensation despite the presence of inert gas.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation of a Two-Phase Ejector Operation Taking into Account Steam Condensation with the Presence of CO2

Kuś,

Madejski

2024

Energies

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Optimizing CO₂ Purification in a Negative CO₂ Emission Power Plant

Amiri,

Mikielewicz,

Ziółkowski

et al. 2024

Chem Eng & Technol

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In the pursuit of mitigating CO2 emissions, this study investigates the optimization of CO2 purification within a negative CO2 emission power plant using a spray ejector condenser (SEC) coupled with a separator. The approach involves direct‐contact condensation of vapor, primarily composed of an inert gas (CO2), facilitated by a subcooled liquid spray. A comprehensive analysis is presented, employing a numerical model to simulate a cyclone separator under various SEC outlet conditions. Methodologically, the simulation, conducted in Fluent, encompasses three‐dimensional, transient, and turbulent characteristics using the Reynolds stress model turbulent model and mixture model to replicate the turbulent two‐phase flow within a gas–liquid separator. Structural considerations are delved into, evaluating the efficacy of single‐ and dual‐inlet separators to enhance CO2 purification efficiency. The study reveals significant insights into the optimization process, highlighting a notable enhancement in separation efficiency within the dual‐inlet cyclone, compared to its single inlet counterpart. Specifically, a 90.7 % separation efficiency is observed in the former, characterized by symmetrical flow patterns devoid of wavering CO2 cores, whereas the latter exhibits less desirable velocity vectors. Furthermore, the investigation explores the influence of key parameters, such as liquid volume fraction (LVF) and water droplet diameter, on separation efficiency. It is ascertained that a 10 % LVF with a water droplet diameter of 10 µm yields the highest separation efficiency at 90.7 %, whereas a 20 % LVF with a water droplet diameter of 1 µm results in a reduced efficiency of 50.79 %. Moreover, the impact of structural modifications, such as the addition of vanes, on separation efficiency and pressure drop is explored. Remarkably, the incorporation of vanes leads to a 9.2 % improvement in separation efficiency and a 16.8 % reduction in pressure drop at a 10 % LVF. The findings underscore the significance of structural considerations and parameter optimization in advancing CO2 capture technologies, with implications for sustainable energy production and environmental conservation.

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Theoretical modeling and investigation of the influence of deaerator on the transient process in power plants

Yao,

Zhang,

et al. 2024

Applied Energy

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A novel concept of enhanced direct-contact condensation of vapour- inert gas mixture in a spray ejector condenser

Cited by 9 publications

References 20 publications

Numerical Investigation of a Two-Phase Ejector Operation Taking into Account Steam Condensation with the Presence of CO2

Numerical Investigation of a Two-Phase Ejector Operation Taking into Account Steam Condensation with the Presence of CO2

Optimizing CO₂ Purification in a Negative CO₂ Emission Power Plant

Theoretical modeling and investigation of the influence of deaerator on the transient process in power plants

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A novel concept of enhanced direct-contact condensation of vapour- inert gas mixture in a spray ejector condenser

Cited by 9 publications

References 20 publications

Numerical Investigation of a Two-Phase Ejector Operation Taking into Account Steam Condensation with the Presence of CO2

Numerical Investigation of a Two-Phase Ejector Operation Taking into Account Steam Condensation with the Presence of CO2

Optimizing CO2 Purification in a Negative CO2 Emission Power Plant

Theoretical modeling and investigation of the influence of deaerator on the transient process in power plants

Contact Info

Product

Resources

About

Optimizing CO₂ Purification in a Negative CO₂ Emission Power Plant