Application of Gas Cyclone-Liquid Jet Absorption Separator for Flue-Gas Desulfurization

Self Cite

SO2 and NO emitted from marine ships have seriously polluted the regional environment. However, there is a lack of high-efficiency, small-size, and cost-effective technology with which these pollutants could be purified. Here, a gas cyclone–liquid jet absorption separator (GLAS) combined with NaClO solution was developed to remove SO2 and NO simultaneously. The high-speed gas that rotates in the GLAS forms a high-gravity field and vortex flow, and SO2 and NO were removed efficiently in a small GLAS. The effect of key operating parameters was well studied through the experiment, and the total mass transfer coefficient (K G a) was calculated. It was found that the removal efficiency increased with the absorbent flow rate and concentration, while it decreased with the gas flow rate and the initial SO2 and NO concentrations. Under the experimental conditions, the maximum removal efficiency for SO2 and NO was 99% and 93%, and the maximum K G a was 0.0559 and 0.0357 kmol·m–3·kPa–1·s–1, respectively, which were 10 times higher than that of traditional devices. Semiempirical equations were also developed to predict the mass transfer performance of desulfurization and denitrification by GLAS. The study indicates that GLAS combined with NaClO solution has great potential applications for marine ships.

Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 98%

Simultaneous Removal of SO₂ and NO from the Flue Gas of Marine Ships with a Gas Cyclone–Liquid Jet Absorption Separator

Liu

Wang

et al. 2022

Self Cite

“…In addition, the strong collision of different streams occurs to cause the breakdown of streams to droplets. 417 Figure 21 shows the structure of the jet absorber with clear highlights on jet holes, gas, and absorbent inlet and outlet. The structure has clear advantages in terms of vigorous turbulent flow field in comparison with traditional gas−liquid contactors.…”

Section: Hollow Fiber Membrane Modulementioning

confidence: 99%

Computational Fluid Dynamics Based Modeling of Gas Absorption Process: A State-of-the-Art Review

Liu,

Wang,

Cai

et al. 2024

The effective removal of gas phase species relies on effective gas liquid hydrodynamic contact coupling with fast chemical reaction rates. To promote mass transfer rate and the development of reagents, computational fluid dynamic modeling has long been recognized as an effective methodology for the quantification of physical and chemical parameters. The simulation of the gas liquid process involves the coupling of models including multiphase flow, turbulence, interfacial forces, mass transfer, and chemical reactions. The selection of suitable models according to practical applications has been challenging. In terms of multiphase flow, volume of fraction, Euler−Euler, and Euler−Lagrange approaches are discussed. With regard to turbulence, direct numerical simulation, large eddy simulation, and Reynolds averaged Navier−Stokes approach are compared. With respect to interfacial forces, the dominance of drag, lift, virtual mass, wall lubrication, and turbulent dispersion forces for different situations are obtained. In terms of mass transfer, the development and applications of film model, dimensionless analysis, penetration model, and surface renewal model are discussed. Different methodologies to enhance mass transfer include improvement of equipment structure, addition of nanofluid, and exposure to an energy field are summarized. To accelerate the computational process, four methods including the space−time conservation element and solution element model, compartmental model, reduction in dimension, and multiscale approach are discussed. This paper intends to provide a thorough review on the applications of different models to different situations and, in particular, to reveal the restrictions of different models. Overall, this study lays the foundation for future studies on the optimization of scrubbers for large scale practical applications. It also allows a deeper understanding of the interactions of fluid dynamics, mass transfer, and chemical reactions.

“…The jet-cyclone coupling separator is a novel type of mass transfer enhancement equipment with the advantages of simple structure, strong applicability, light equipment, and good mass transfer effect. It has been widely used in deamination, desulfurization, − and other fields. The device utilizes the collision between the rotating turbulent field and the jet field to break the jet into small droplets, thus increasing the contact area between the two phases and enhancing the mass transfer effect.…”

Section: Introductionmentioning

confidence: 99%

Study on the Jet-Cyclone Coupled Separation Performance of Solvent Naphtha Containing MDEA

Ding

Xiao

Wang

et al. 2023

Self Cite

The removal of methyldiethanolamine (MDEA) from solvent naphtha is crucial due to its impacts on pH and the refining process. In this study, the Fluent simulation method was used to study the internal flow field of a jet-cyclone separator to address the limitations of experimental research. The absorption capacity of water and ethylene glycol were compared by batch experiments as a jet-cyclone coupled separation method for MDEA. In addition, the effects of cyclone inlet flow rate, absorbing liquid temperature, absorbing liquid flow rate, and equipment structure on the separation efficiency of MDEA were investigated. The results showed that the comprehensive separation efficiency of MDEA ranged from 81.4 to 95.43%. This work is the first to use a jet-cyclone coupling separator to treat MDEA in solvent naphtha, expanding the gas–liquid mass transfer equipment field, with promising application prospects.