Experimental and modelling study of energy efficiency of CO2 hydrate slurry in a coil heat exchanger

Dufour, Thomas; Hoang, Hong-Minh; Oignet, Jérémy; Osswald, Véronique; Fournaison, Laurence; Delahaye, Anthony

doi:10.1016/j.apenergy.2019.03.009

Cited by 20 publications

(7 citation statements)

References 26 publications

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“…On the other hand, the hydrate slurry that contains dendritic crystals shows higher viscosity compared with the slurry containing polygonal crystals because the surface area per unit volume of dendritic crystals is larger than that of polygonal crystals. When the viscosity of hydrate slurry is high, pressure loss at the transportation process of O 3 -containing hydrate increases . Moreover, the dehydration efficiency of the hydrate slurry decreases under higher Δ T sub conditions because the size of the individual crystals becomes smaller.…”

Section: Resultsmentioning

confidence: 99%

“…When the viscosity of hydrate slurry is high, pressure loss at the transportation process of O 3containing hydrate increases. 42 Moreover, the dehydration efficiency of the hydrate slurry decreases under higher ΔT sub conditions because the size of the individual crystals becomes smaller. Therefore, production of O 3 -containing hydrate under lower ΔT sub conditions would be suitable for efficient dewatering and transportation of the hydrate slurry.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Crystal Growth of Clathrate Hydrate with Ozone: Implication for Ozone Preservation

Matsuura

Ozawa

Alavi

et al. 2020

ACS Sustainable Chem. Eng.

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Preservation using hydrates as a storage medium is the only technology that enables long-term and high-concentration O3 preservation. This study reports the visual observations of the crystal growth of O3-containing hydrate for the process design of the hydrate production plant. We conducted experiments with the feed gas involving O3, O2, and CO2 in the molar ratio of O3:O2:CO2 = 3.4:42.0:52.6. During observations, O3 in the mixed gas remained at 1.31–2.43 mol %, which is comparable to those of the previous experiments. The observed results of hydrate crystal growth dynamics were classified into two types, which are lateral growth along the gas/water interface and growth into the bulk of the liquid water phase. Crystal morphology varied from polygonal to columnar, dendritic, or haze like with increasing subcooling temperature relative to equilibrium. The diversity of the crystal morphology of O3-containing hydrate was comparable to those of O2 + CO2 hydrate and CO2 hydrate. The implications of the obtained results for the operating conditions of an O3-containing hydrate production plant are discussed.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Crystal Growth of Clathrate Hydrate with Ozone: Implication for Ozone Preservation

Matsuura

Ozawa

Alavi

et al. 2020

ACS Sustainable Chem. Eng.

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“…Fitness functions in single objective analytical optimization problems are cooling capacity presented in equation (1) that should be maximized and total weight of the radiator that is proposed in equation (35) which should be minimized.…”

Section: Multi-objective Functionmentioning

confidence: 99%

“…(31) to equation. (35), W max is determined as By simplifying the above equation, W max is written as…”

Section: Multi-objective Analytical Optimizationmentioning

confidence: 99%

“…Effectiveness of the radiator considering it as a cross flow heat exchanger with unmixed fluids in both sides could be calculated as 31,32 where C r is the heat capacity ratio defined as 33,34 Also, NTU is the number of transfer units defined as 35,36 In equation (4) A and h are heat transfer area and convective heat transfer coefficient, respectively. In this equation, h and c indices represent tube and fin sides, respectively.…”

Section: Mathematical Modelingmentioning

confidence: 99%

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Comprehensive analytical framework for optimal sizing of louvered fin flat tube car radiators

Hadidi

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the present research, a comprehensive analytical framework is proposed for optimal sizing of louvered fin flat tube car radiators. In order to perform optimal sizing, eleven geometric variables, which are all geometric parameters of the radiator, were selected as the design parameters. These variables include large and small diameters of tubes, length and wall thickness of tubes, fins’ pitch, louvers’ pitch on each fin, length of the fin, louver length and height, fin thickness, number of fins and louver angle on fins. The effects of all of these parameters on the cooling capacity and total weight of the radiator are investigated in the form of single objective optimization problems in which cooling capacity should be maximized and total weight of the radiator should be minimized. Using the proposed framework, the cooling capacity of the radiator has increased by about 8.8% compared to the base design. It is shown that some geometric parameters have the opposite effect on objective functions. Therefore, an analytical multi-objective optimization procedure is proposed to satisfy both of the goals, simultaneously. The values of the geometric parameters determined in this paper are more practical in terms of manufacturing than the values suggested in the base design.

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Rate transient analysis for multilateral horizontal well in natural gas hydrate: superposition principle and reciprocity

Ma,

Chu,

et al. 2024

Int J Coal Sci Technol

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Due to high energy density, clean combustion products and abundant resources, natural gas hydrates (NGHs) have been regarded as an important clean energy source with the potential for large-scale development and utilization. However, pilot tests in NGHs show that their production rates are far below commercial needs. Multilateral well technology may lead to a solution to this problem because it can dramatically expand the drainage area of production wells. This paper presents the practical rate transient analysis for multilateral horizontal wells in NGHs. In developing solution to the diffusivity equation of multilateral horizontal wells in NGHs, the superposition principle and reciprocity are applied. We wrote the governing equation in cylindrical coordinates to describe the NGH flow process. We used the moving boundaries and dissociation coefficients to model the solid-to-gas transition process in hydrates. To obtain solutions for flow in hydrate reservoirs, we used Laplace transforms and the Stehfest numerical inversion method. Superposition principle and Gaussian elimination are applied to obtain the desired solution for multilateral horizontal wells. We validated our proposed model with a commercial numerical simulator. By performing sensitivity analyses, effects on production behavior of the number of branches, dissociation coefficient, radius of the region with dissociated hydrate, and dispersion ratio are determined. A synthetic case study is conducted to show the typical production behaviors.

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Experimental and modelling study of energy efficiency of CO2 hydrate slurry in a coil heat exchanger

Cited by 20 publications

References 26 publications

Crystal Growth of Clathrate Hydrate with Ozone: Implication for Ozone Preservation

Crystal Growth of Clathrate Hydrate with Ozone: Implication for Ozone Preservation

Comprehensive analytical framework for optimal sizing of louvered fin flat tube car radiators

Rate transient analysis for multilateral horizontal well in natural gas hydrate: superposition principle and reciprocity

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