Effect of moisture content on dense-phase pneumatic conveying of pulverized lignite under high pressure

Zhou, Haijun; Pei, Yu Bin

doi:10.1016/j.powtec.2015.10.026

Cited by 21 publications

(5 citation statements)

References 47 publications

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“…This study conducted a series of high-pressure dense-phase pneumatic conveying experiments using the self-developed-top-discharge-high-pressure-dense-phase pneumatic conveying system [12] from Southeast University, with nitrogen (N 2 ) as the carrier gas and Inner Mongolian pulverized coal as the conveying material [1]. The whole experimental system, depicted in Figure 1, consists of five main components: the gas supply system, the hoppers, the pipeline, the sensors, and the data sampling and controlling system.…”

Section: Methodsmentioning

confidence: 99%

“…Among various clean coal technologies, coal gasification stands out as one of the most notable approaches. In particular, large-scale high-efficiency entrainedflow coal gasification technology has emerged as the most promising coal gasification method [1], and high-pressure dense-phase pneumatic conveying is a crucial component of this gasification technology.…”

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: Introductionmentioning

confidence: 99%

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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“…The schematic diagram of a high-pressure dense-phase conveying test rig is shown in figure 9, whose operational principle has been described by Zhou et al [24].…”

Section: Methodsmentioning

confidence: 99%

“…The charged particles with large velocity contribute most to the electrostatic signal on the ESA, which results in the greater measured velocity. Overall, when moisture content increases to some extent (the critical moisture content, refer to [24]), the particles flowing in the horizontal pipe would be unable to carry charges evenly. The proposed method is not applicable in this case.…”

Section: Effect Of Moisture Contentmentioning

confidence: 99%

Particle velocity measurement method of dense-phase gas–solid flow based on an electrostatic sensor array

Gao¹,

Chang²,

Wang³

2019

Meas. Sci. Technol.

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Particle velocity is an important parameter of dense-phase gas–solid flow for both monitoring and control purposes. This paper presents a recent development in the noncontact measurement of solid particle velocity using an electrostatic sensor array (ESA). The electrostatic sensor array with eight electrodes is used to collect electrostatic signals generated by the moving charged particles. A velocity measurement method based on the tomography technique is presented, which measures the velocity of solid particles in the horizontal pipeline. The simulated model of the ESA with eight electrodes is built, and the sensing area of the ESA is mapped onto 13 pixels of equal area. Simulation tests are then conducted to evaluate the feasibility and accuracy of the velocity measurement at different positions. Finally, experimental tests are conducted on the horizontal conveying pipeline of a high- pressure dense-phase pneumatic conveying pilot system. Results indicate that the proposed method is capable of measuring the spatial average velocity of pulverized coal over the cross-sectional area of pipe with a relative error within ±7% for the conditions of particles tending to be of uniform distribution. In addition, the effect of moisture on velocity measurement is investigated.

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“…In addition, it is inevitable to encounter moisture in the bulk transportation of feed pellets via pneumatic conveying [125]. The modelling of moisture is in principle similar to that of electrostatics within the framework of CFD-DEM.…”

Section: Electrostatic and Moisture Effectsmentioning

confidence: 99%

Recent Advancement in Pneumatic Conveying for Application in Feed Industry: A Review

2023

Preprint

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The transportation of feed pellets via pneumatic conveying plays an improtant role in feed industry. In recent years, many efforts are made both exprimentally and numerically to gain a better understanding of the underlying mechanism for pneumatic conveying. Though few of those research is directly related to feed pellets, it can be beneficial to draw a full picture of rencent development in pneumatic conveying, with emphasis on aspects extendable to feed transportation. This paper reviews first the major factors concerning feed pellets pneumatic conveying, such as particle breakage, pipe wear and electrostatic. Building on that, new advancement including emerging new technologies in experiments and simulations are discussed, with a focus on the experimental measurements and mathematical models, repectively. The needs for future research and the analogy to feed pellets tranportation is given lastly.

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Effect of moisture content on dense-phase pneumatic conveying of pulverized lignite under high pressure

Cited by 21 publications

References 47 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

Particle velocity measurement method of dense-phase gas–solid flow based on an electrostatic sensor array

Recent Advancement in Pneumatic Conveying for Application in Feed Industry: A Review

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