Experimental investigation on the microprocess of hydrate particle agglomeration using a high-speed camera

Song, Guangchun; Li, Yuxing; Wang, Wuchang; Liu, Shuai; Wang, Xiao Yu; Shi, Zhengzhuo; Yao, Shupeng

doi:10.1016/j.fuel.2018.09.155

Cited by 53 publications

(26 citation statements)

References 24 publications

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“…It could be seen from the figure that temperature, pressure, gas consumption, and pressure drop all changed with the running time. The variation trend was similar to the growth characteristics of NGH in the oil-in-water emulsion system described in the previous literature, 50 − 52 and the experimental process could be roughly divided into three stages.…”

Section: Results and Discussionsupporting

confidence: 82%

“…When the flow rate of the system was increased, the average diameter decreased, and the particle distribution curve moved to the left. Song 13 et al captured the micromorphology and microflow behavior of hydrate particles with high-speed cameras and found that in the hydrate slurry, the proportion of small hydrate particles gradually decreased, while that of large hydrate particles gradually increased. In addition, the average particle size of hydrate particles gradually increased during the flow process and eventually tended to be stable.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of the Growth Kinetics of Natural Gas Hydrates in an Oil–Water Emulsion System

Zhang

Zhao

et al. 2021

ACS Omega

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In order to explore the growth kinetics characteristics of NGH (natural gas hydrate) in an oil and gas mixed transportation pipeline and ensure the safe transportation of the pipeline, with the high-pressure hydrate experimental loop, an experimental study on the growth characteristics of NGH in an oil–water emulsion system was carried out, and the effects of pressure, flow rate, and water cut on the hydrate induction time, gas consumption, consumption rate, and hydrate volume fraction were explored, and important experimental rules were obtained. The experiment was divided into three stages: in the rapid formation stage of the hydrate, the temperature and gas consumption rose sharply, and the pressure dropped suddenly. The induction time decreased with the increase of pressure, flow rate, and water cut. The induction time of 6 MPa was 86.13 min, which was shortened by 39.68% compared with the induction time of 142.8 min of 5 MPa. The induction time of 1500 kg/h was 88.27 min, which was shorter by 13.91% than that 102.53 min of 550 kg/h. The induction time of 20% water cut was 58.53 min, which was shorter by 13.99% than that 68.4 min of 15% water cut. The gas consumption and hydrate volume fraction were both increased with the increase of pressure and water cut and decreased with the increase in the flow rate. In the whole process of the formation of NGH, the consumption rate first increased and then decreased. The pressure-drop and apparent viscosity increased with the increase of hydrate volume fraction in a certain range. The sensitivity analysis of hydrate induction time based on the standard regression coefficient method showed that the initial pressure played a major role, followed by the flow rate and the water cut. Based on the sensitivity analysis of hydrate volume fraction by the gray correlation method, it was found that the hydrate volume fraction had the closest relationship with the initial pressure, followed by the flow rate and the water cut. Finally, the empirical formulas of induction time and hydrate volume fraction in an oil–water emulsion system were established.

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Section: Results and Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Growth Kinetics of Natural Gas Hydrates in an Oil–Water Emulsion System

Zhang

Zhao

et al. 2021

ACS Omega

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“…Vision-based methods are becoming crucial in the non-contact measurement of displacement and velocities of engineering structures [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. However, the use of special high-speed imaging technology is necessary if the dynamic response contains high frequencies, which cameras cannot correctly capture with standard frame rates.…”

Section: Introductionmentioning

confidence: 99%

“…The formation of ice crystals on the epidermal tissue of strawberry geranium leaves was analyzed. In geological research, Song et al [ 13 ] presented observation results of hydrate particles formation in the microflow of water and methane systems. In the experiment, the authors used a Photron FastCam SA-X2 camera with 1024 × 1024 pixel resolution.…”

Section: Introductionmentioning

confidence: 99%

Indirect Measurement of Loading Forces with High-Speed Camera

Mendrok

Dworakowski

Dziedziech

et al. 2021

Sensors

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In the last few decades, there has been a significant increase in interest in developing, constructing, and using structural health monitoring (SHM) systems. The classic monitoring system should, by definition, have, in addition to the diagnostic module, a module responsible for monitoring loads. These loads can be measured with piezoelectric force sensors or indirectly with strain gauges such as resistance strain gauges or FBG sensors. However, this is not always feasible due to how the force is applied or because sensors cannot be mounted. Therefore, methods for identifying excitation forces based on response measurements are often used. This approach is usually cheaper and easier to implement from the measurement side. However, in this approach, it is necessary to use a network of response sensors, whose installation and wiring can cause technological difficulties and modify the results for slender constructions. Moreover, many load identification methods require the use of multiple sensors to identify a single force history. Increasing the number of sensors recording responses improves the numerical conditioning of the method. The proposed article presents the use of contactless measurements carried out with the help of a high-speed camera to identify the forces exiting the object.

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“…As exploration and production is going into deeper water, the focus of flow-assurance strategies are shifting from traditional methods to risk-control techniques [2]. Hydrate slurry flow has gradually gained the attention of researchers [13][14][15][16][17][18][19][20], who have referred to it as a form of hydrate risk control. However, studies on hydrate slurry are still in the period of experimental investigation with preliminary theoretical development [21].…”

Section: Introductionmentioning

confidence: 99%

Study on the Decomposition Mechanism of Natural Gas Hydrate Particles and Its Microscopic Agglomeration Characteristics

Shi

Zhou

et al. 2018

Applied Sciences

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Research on hydrate dissociation mechanisms is critical to solving the issue of hydrate blockage and developing hydrate slurry transportation technology. Thus, in this paper, natural gas hydrate slurry decomposition experiments were investigated on a high-pressure hydrate experimental loop, which was equipped with two on-line particle analyzers: focused beam reflectance measurement (FBRM) and particle video microscope (PVM). First, it was observed from the PVM that different hydrate particles did not dissociate at the same time in the system, which indicated that the probability of hydrate particle dissociation depended on the particle’s shape and size. Meanwhile, data from FBRM presented a periodic oscillating trend of the particle/droplet numbers and chord length during the hydrate slurry dissociation, which further demonstrated these micro hydrate particles/droplets were in a dynamic coupling process of breakage and agglomeration under the action of flow shear during the hydrate slurry dissociation. Then, the influences of flow rate, pressure, water-cut, and additive dosage on the particles chord length distribution during the hydrate decomposition were summarized. Moreover, two kinds of particle chord length treatment methods (the average un-weighted and squared-weighted) were utilized to analyze these data onto hydrate particles’ chord length distribution. Finally, based on the above experimental data analysis, some important conclusions were obtained. The agglomeration of particles/droplets was easier under low flow rate during hydrate slurry dissociation, while high flow rate could restrain agglomeration effectively. The particle/droplet agglomerating trend and plug probability went up with the water-cut in the process of hydrate slurry decomposition. In addition, anti-agglomerates (AA) greatly prohibited those micro-particles/droplets from agglomeration during decomposition, resulting in relatively stable mean and square weighting chord length curves.

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Experimental investigation on the microprocess of hydrate particle agglomeration using a high-speed camera

Cited by 53 publications

References 24 publications

Experimental Study of the Growth Kinetics of Natural Gas Hydrates in an Oil–Water Emulsion System

Experimental Study of the Growth Kinetics of Natural Gas Hydrates in an Oil–Water Emulsion System

Indirect Measurement of Loading Forces with High-Speed Camera

Study on the Decomposition Mechanism of Natural Gas Hydrate Particles and Its Microscopic Agglomeration Characteristics

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