Numerical simulation of pipeline hydrate particle agglomeration based on population balance theory

Song, Guangchun; Li, Yuxing; Wang, Wuchang; Jiang, Kai; Shi, Zhengzhuo; Yao, Shupeng

doi:10.1016/j.jngse.2018.01.009

Cited by 30 publications

(21 citation statements)

References 30 publications

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“…Researching the safe flow of natural gas hydrate, Song et al [ 14 ] introduced a population equilibrium model based on the aggregation dynamics of hydrate particles to simulate the effects of fluid flow rate and hydrate volume fraction on the safe flow characteristics of hydrate slurry. Then, the population balance model based on solid hydrate grain accumulation dynamics [ 15 ], the collision frequency, aggregation efficiency, fragmentation frequency, and sub-particles size distribution function after crushing of the hydrate solid particles were considered in the flow process. The simulation results were compared with the calculated results of the hydrate particle growth model.…”

Section: Introductionmentioning

confidence: 99%

“…The simulation results were compared with the calculated results of the hydrate particle growth model. In addition, Song et al [ 16 , 17 ] simulated the deposition rule of gas hydrate particles in the pipeline by referencing the condensation method, and he established the kinetic model of hydrate deposition and hydrate decomposition. Based on the theory of hydrate particle deposition, the structural model of hydrate deposition was established, the main mechanical parameters were determined, and the finite element numerical simulation method was used to calculate the hydrate deposition on the pipe wall.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation Study on Flow Laws and Heat Transfer of Gas Hydrate in the Spiral Flow Pipeline with Long Twisted Band

Rao

Wang

et al. 2021

Entropy

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The natural gas hydrate plugging problems in the mixed pipeline are becoming more and more serious. The hydrate plugging has gradually become an important problem to ensure the safety of pipeline operation. The deposition and heat transfer characteristics of natural gas hydrate particles in the spiral flow pipeline have been studied. The DPM model (discrete phase model) was used to simulate the motion of solid particles, which was used to simulate the complex spiral flow characteristics of hydrate in the pipeline with a long twisted band. The deposition and heat transfer characteristics of gas hydrate particles in the spiral flow pipeline were studied. The velocity distribution, pressure drop distribution, heat transfer characteristics, and particle settling characteristics in the pipeline were investigated. The numerical results showed that compared with the straight flow without a long twisted band, two obvious eddies are formed in the flow field with a long twisted band, and the velocities are maximum at the center of the vortices. Along the direction of the pipeline, the two vortices move toward the pipe wall from near the twisted band, which can effectively carry the hydrate particles deposited on the wall. With the same Reynolds number, the twisted rate was greater, the spiral strength was weaker, the tangential velocity was smaller, and the pressure drop was smaller. Therefore, the pressure loss can be reduced as much as possible with effect of the spiral flow. In a straight light flow, the Nusselt number is in a parabolic shape with the opening downwards. At the center of the pipe, the Nusselt number gradually decreased toward the pipe wall at the maximum, and at the near wall, the attenuation gradient of the Nu number was large. For spiral flow, the curve presented by the Nusselt number was a trough at the center of the pipe and a peak at 1/2 of the pipe diameter. With the reduction of twist rate, the Nusselt number becomes larger. Therefore, the spiral flow can make the temperature distribution more even and prevent the large temperature difference, resulting in the mass formation of hydrate particles in the pipeline wall. Spiral flow has a good carrying effect. Under the same condition, the spiral flow carried hydrate particles at a distance about 3–4 times farther than that of the straight flow.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on Flow Laws and Heat Transfer of Gas Hydrate in the Spiral Flow Pipeline with Long Twisted Band

Rao

Wang

et al. 2021

Entropy

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“…Son g et al 8 int rod uced a popu lat ion equ ilib rium mod el based on the a ggregat ion dynam ics of h yd rate part icles to simu late th e effects of f lu id f lo w rate and hyd rate v o lume f raction on th e safe f lo w characterist ics of hyd rate slu rry. Then th e popu latio n balance mod el based on so lid hyd rate grain accumu lat ion dynam ics 9 , th e co llision f requen cy , aggregatio n efficiency, fra gm entatio n f req uen cy and sub -part icles size d ist ribut ion fun ct ion after cru sh in g of the hyd rate so lid particles were co nsid ered in t he f lo w process, simu lat ion un der d ifferent cond it ions of hyd rate part icle aggregatio n pro cess, th e simu lation resu lt s were com pared with the calcu lated resu lt s of the hyd rate part icle gro wth mod el. In addit ion , So n g et a l. [10][11] sim u lated th e d epo sit ion ru le of gas hyd rate part icles in th e p ipelin e b y referencin g condensat ion metho d, and estab lish ed the k in et ic model of hyd rate d epo sit ion and hy drate decompo sit ion .…”

Section: Introductionmentioning

confidence: 99%

“…Then th e popu latio n balance mod el based on so lid hyd rate grain accumu lat ion dynam ics 9 , th e co llision f requen cy , aggregatio n efficiency, fra gm entatio n f req uen cy and sub -part icles size d ist ribut ion fun ct ion after cru sh in g of the hyd rate so lid particles were co nsid ered in t he f lo w process, simu lat ion un der d ifferent cond it ions of hyd rate part icle aggregatio n pro cess, th e simu lation resu lt s were com pared with the calcu lated resu lt s of the hyd rate part icle gro wth mod el. In addit ion , So n g et a l. [10][11] sim u lated th e d epo sit ion ru le of gas hyd rate part icles in th e p ipelin e b y referencin g condensat ion metho d, and estab lish ed the k in et ic model of hyd rate d epo sit ion and hy drate decompo sit ion . Based o n the theo ry of hyd rate part icle dep osit io n, th e st ru ctu ral m odel of h yd rate depo sit ion wa s established, th e ma in mechan ica l parameters were determ ined , and t he f in ite element num erical simu lation met hod was u sed t o calcu late the hyd rate d epo sit ion on th e p ipe wa ll.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Spiral Flow and Heat Transfer in Hydrate Pipeline With Long Twisted Band

Rao¹,

Li²,

Wang³

et al. 2020

Preprint

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The DPM model (discrete phase model) considering the motion of solid particles was used to simulate the complex spiral flow characteristics of hydrate in the pipe spinning up with long twisted band. The deposition and heat transfer characteristics of gas hydrate particles in the pipe spiral flow were studied. The velocity distribution, pressure drop distribution, heat transfer characteristics and particle settling characteristics of the flow field in the pipeline were investigated. The numerical results show that, compared with the straight flow of light pipe without twisted band, two obvious eddies are formed in the flow field under the spinning action of twisted band, and the velocities are maximum at the center of the eddies. Along the direction of the pipe, the two vortices move towards the pipe wall from near the twisted band, which can effectively carry the hydrate particles deposited on the pipe wall. With the same Reynolds number, the greater the twist ratio, the weaker the spiral strength, the smaller the tangential velocity of the spiral flow, and the smaller the pressure drop of the pipe. Therefore, the pressure loss can be reduced as much as possible while ensuring the spinning effect of the spiral flow. In a straight light pipe flow, the Nusser number is in a parabolic shape with the opening downwards. At the center of the pipe, the Nusser number gradually decreases towards the pipe wall at the maximum, and at the near wall, the attenuation gradient of Nu is large. For spiral flow, the curve presented by Nusserr number shows a trough at the center of the pipe and a peak at 1/2 of the pipe diameter. With the reduction of twist rate, the Nussel number becomes larger and larger. Therefore, the spiral flow can make the temperature distribution in the flow field in the pipeline more even, and prevent the large temperature difference resulting in the mass formation of hydrate particles in the pipeline wall. Spiral flow has a good carrying effect. Under the same working condition, the spiral flow carries hydrate particles at a distance about 3-4 times that of the straight flow.

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“…Fatnes simulated the hydrate flow behaviors in horizontal tubes by ANSYS CFX [19]. Song et al simulated the agglomeration, breakage and deposition of CCl 3 F (R11) hydrate and applied the population balance model in his study [20][21][22][23]. However, the current simulations of hydrate slurry by CFD are mainly concentrated in horizontal pipes, and there is less simulation in vertical pipes related to hydrate mining.…”

Section: Introductionmentioning

confidence: 99%

Investigation of hydrate slurry flow behaviors in deep-sea pipes with different inclination angles

Yao

Wang

et al. 2019

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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The marine area is the main direction of the development of oil and gas resources in the world. The pipeline transportation technology of natural gas hydrate slurry plays an important role in the exploitation of marine oil and gas and the exploitation of marine gas hydrate resources. In order to study the influence of pipe inclination on pipeline transportation, population balance model based on hydrate particle aggregation dynamics was coupled with the Eulerian–Eulerian two-fluid multiphase flow model to simulate the flow behaviors of hydrate slurry flow in pipes with different inclination angles. In the study, three variables of inclination, flow rate and initial particle size were considered. The results show that tilted pipes are beneficial to hydrate slurry transport rather than harmful. Meanwhile, higher flow rates and lower initial particle sizes are beneficial for promoting the flow safety of hydrate slurry transport. However, the flow pressure drop of the hydrate slurry increases with the increase of the flow rate and the decrease of the initial particle size, which is not conducive to the economics of mining. The research results in this paper can provide reference for the research of hydrate slurry flow safety and parameter guidance for hydrate solid fluidized mining.

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Numerical simulation of pipeline hydrate particle agglomeration based on population balance theory

Cited by 30 publications

References 30 publications

Numerical Simulation Study on Flow Laws and Heat Transfer of Gas Hydrate in the Spiral Flow Pipeline with Long Twisted Band

Numerical Simulation Study on Flow Laws and Heat Transfer of Gas Hydrate in the Spiral Flow Pipeline with Long Twisted Band

Numerical Simulation of Spiral Flow and Heat Transfer in Hydrate Pipeline With Long Twisted Band

Investigation of hydrate slurry flow behaviors in deep-sea pipes with different inclination angles

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