Conveying mechanisms of dense-phase pneumatic conveying of pulverized lignite in horizontal pipe under high pressure

Zhou, Haijun

doi:10.1016/j.powtec.2020.01.010

Cited by 14 publications

(6 citation statements)

References 62 publications

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“…During the conveying process, the pressure in the sending hopper (P 1 ) was maintained at 3.0 MPa, the pressure in the receiving hopper (P 2 ) was kept at 2.5 MPa, the flow rate of fluidizing gas (Q f ) was held at 0.4 m 3 /h, and the flow rate of supplementary gas (Q s ) was varied from 0.4 to 1.2 m 3 /h for the conveying experiment to obtain experimental data (refer to Table 1). More detailed information about the whole experimental system is available in references [8,37].…”

Section: Methodsmentioning

confidence: 99%

“…Given that high-pressure dense-phase pneumatic conveying in horizontal pipe is a non-uniform structured flow composed of three flow regimes (dilute regime, intermediate regime, and dense regime) [8], this study restructured a three-zone drag model (see Equation ( 9)), which it combined with the advantages of the Huilin-Gidaspow drag model [40] and Mckeen drag model [41]. In this drag model, the Wen and Yu drag model [42] is applied to simulate the dilute regime, the Mckeen drag model is used to simulate the intermediate regime, and the Ergun drag model is utilized to simulate the dense regime.…”

Section: Three-zone Drag Modelmentioning

confidence: 99%

“…Current research mainly focuses on the experimental research field of high-pressure dense-phase pneumatic conveying. Numerous scholars have conducted a large number of experimental studies from various perspectives using existing measurement techniques and equipment, yielding several valuable results related to pipeline resistance characteristics, flow patterns, conveying characteristics and stability [5][6][7][8][9][10]. As is known, pneumatic conveying is a highly comprehensive discipline that involves multiple fields, such as fluid mechanics, mechanical engineering, and particle science.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Frictional Stress Models on Simulation Results of High-Pressure Dense-Phase Pneumatic Conveying in Horizontal Pipe

Ding,

Zhou,

Tang

et al. 2024

Applied Sciences

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Based on the two-fluid model, a three-zone drag model was developed, and the kinetic theory of granular flows and the Schneiderbauer solids wall boundary model were modified to establish a new three-dimensional (3D) unsteady mathematical model for high-pressure dense-phase pneumatic conveying in horizontal pipe. With this mathematical model, the influence of the three frictional stress models, namely Dartevelle frictional stress model, Srivastava and Sundaresan frictional stress model, and the modified Berzi frictional stress model, on the simulation result was explored. The simulation results showed that the three frictional stress models accurately predicted the pressure drop and its variations with supplementary gas in the horizontal pipe, with relative errors ranging from −4.91% to +7.60%. Moreover, the predicted solids volume fraction distribution in the cross-section of the horizontal pipe using these frictional stress models exhibited good agreement with the electrical capacitance tomography (ECT) images. Notably, the influence of the three frictional stress models on the simulation results was predominantly observed in the transition region and deposited region. In the deposited region, stronger frictional stress resulting in lower solids volume fraction and a higher pressure drop in the horizontal pipe were observed. Among the three frictional stress models, the simulation results with the modified Berzi frictional stress model aligned better with the experimental data. Therefore, the modified Berzi frictional stress model is deemed more suitable for simulating high-pressure dense-phase pneumatic conveying in horizontal pipe.

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Section: Methodsmentioning

confidence: 99%

Section: Three-zone Drag Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Frictional Stress Models on Simulation Results of High-Pressure Dense-Phase Pneumatic Conveying in Horizontal Pipe

Ding,

Zhou,

Tang

et al. 2024

Applied Sciences

Self Cite

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“…Additionally, with the increase in the conditioning gas flow rate, the solid-gas ratio decreased, and the solid mass flow rate increased. In another investigation, Zhou and Xiong [12] performed high-pressure dense-phase pneumatic conveying experiments considering pulverized lignite. It was shown that the increase in the supplemental gas flow rate weakens the conveying capacity.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Replenishment Methods of the Sending Tanks on Pneumatic Conveying Characteristics

Zhou,

Yan,

Guo

et al. 2024

Chem Eng & Technol

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Data on pressure signals and gas flow rate signals was collected under various experimental conditions. A comparative analysis was conducted to investigate the gradient changes of the fluidizing gas, the supplemental gas, and the pressurizing gas. A three‐factor three‐level orthogonal experiment was carried out. The results demonstrated that the proper use of the fluidizing gas can enhance the steady condition of the conveying process. Increasing the flow rate of the supplemental gas can improve the steady flow pattern, while the pressurizing gas has the opposite effect. The degree of influence of these parameters on the steady condition of the conveying process was shown to follow the order of fluidizing gas valve opening, pressurizing gas valve opening, and regulating gas valve opening.

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“…Zhou Jing [15] studied the different flow states of bending pipes with the same inner diameter and different curvature radii under a certain mixing rate of ash and gas, as well as the wear degree of conveying materials to the bending pipe and the pressure loss of conveying gas in the bending pipe, and suggested that the rate of curvature radius of bending pipe to the bending pipe diameter should be 4 ~ 5. Cai Haifeng et [16] al. simulated the particle flow in a horizontal bending pipe for high-pressure dense phase pneumatic conveying in a horizontal bending pipe, and found that after particles entered the bending pipe from the upstream horizontal pipe, a high concentration area gradually formed near the outer wall of the pipe, and the friction stress between particles and the shear stress between particles and the wall increased rapidly.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Gas Hydrate Particle Deposition in Bending Pipe

Rao,

Zheng,

Wang

et al. 2023

Preprint

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Bending pipe is a common component of long distance pipeline. Accurately understanding the flow law of hydrate particles in elbow pipe is of great significance for optimizing pipeline design, improving production efficiency of gas transmission pipeline and ensuring pipeline safety. Taking the flow of hydrate particles in a Bending pipe as the object of study, the spiral flow attenuation and hydrate particle deposition under different bending pipe angles, different rate of bending pipe to diameter, different Reynolds number and different torsion were studied by numerical simulation method. The results show that the larger the swirl number, the higher the spiral flow intensity. When the fluid enters the bending pipe, the Angle of the bending pipe is larger, the torsional rate is smaller, and the Reynolds number is larger, the swirl number is larger, the intensity of the swirl flow is stronger, and the swirl number is larger at the same position. However, the larger the bending pipe to diameter ratio, the greater the change of the total swirl number and the weaker the strength at outflow, but the slower the change of swirl number, indicating that the spiral flow attenuation is slower. The larger the bending pipe Angle, the larger the bending pipe diameter rate, the smaller the torsion rate and the larger the Reynolds number, the smaller the deposition rate of the particles after flowing through the pipe. The results show that the spiral flow strength can be maintained in a proper way to reduce the deposition and ensure the safety of the conveying process.

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Conveying mechanisms of dense-phase pneumatic conveying of pulverized lignite in horizontal pipe under high pressure

Cited by 14 publications

References 62 publications

Influence of Frictional Stress Models on Simulation Results of High-Pressure Dense-Phase Pneumatic Conveying in Horizontal Pipe

Influence of Frictional Stress Models on Simulation Results of High-Pressure Dense-Phase Pneumatic Conveying in Horizontal Pipe

Influence of the Replenishment Methods of the Sending Tanks on Pneumatic Conveying Characteristics

Numerical Simulation on Gas Hydrate Particle Deposition in Bending Pipe

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