Efficiency and stability of lump coal particles swirling flow pneumatic conveying system

2020 ◽  
Vol 157 ◽  
pp. 92-103
Author(s):  
Jiawei Zhou ◽  
Xiaoming Han ◽  
Shuangxi Jing ◽  
Yu Liu
Keyword(s):  
Swirling Flow ◽  
Pneumatic Conveying ◽  
Coal Particles ◽  
Lump Coal ◽  
Conveying System

scholarly journals Prediction of Horizontal Pneumatic Conveying of Large Coal Particles Using Discrete Phase Model

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Daolong Yang ◽  
Ge Li ◽  
Yanxiang Wang ◽  
Qingkai Wang ◽  
Jianping Li ◽  
...  
Keyword(s):  
Simulation Method ◽  
Phase Model ◽  
Pneumatic Conveying ◽  
Discrete Phase Model ◽  
Two Phase ◽  
Coal Particles ◽  
Large Particles ◽  
Discrete Phase ◽  
Field Velocity ◽  
Conveying System

The pneumatic conveying focusing on gas-solid two-phase flow plays an important role in a conveying system. Previous work has been conducted in the fields of small particles, where the size was less than 5 mm; however, there are few studies regarding large sizes (>5 mm). In order to predict the horizontal pneumatic conveying of large coal particles, the coupling methods based on the Euler–Lagrange approach and discrete phase model (DPM) have been used for the simulated research. Compared with the experimental results under the same working condition, the particle trajectory obtained by simulation is similar to the particle distribution at the same position in the experiment, and it turns out that the simulation method is feasible for the horizontal pneumatic conveying of large particles. Multifactor simulations are also carried out to analyse the effects of particle size, flow field velocity, solid-gas rate, and pipe diameter on the wall abrasion during horizontal pneumatic conveying, which provides simulation reference and design guide for pneumatic conveying of large particles.

scholarly journals Research on the Pressure Dropin Horizontal Pneumatic Conveying for Large Coal Particles

Processes ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 650
Author(s):  
Daolong Yang ◽  
Yanxiang Wang ◽  
Zhengwei Hu
Keyword(s):  
Pressure Drop ◽  
Flow Velocity ◽  
Model Simulation ◽  
Particle Model ◽  
Pneumatic Conveying ◽  
Coal Consumption ◽  
Environmental Friendliness ◽  
Coal Particles ◽  
Simulation Results ◽  
Conveying System

As a type of airtight conveying mode, pneumatic conveying has the advantages of environmental friendliness and conveying without dust overflow. The application of the pneumatic conveying system in the field of coal particle conveying can avoid direct contact between coal particles and the atmosphere, which helps to reduce the concentration of air dust and improve environmental quality in coal production and coal consumption enterprises. In order to predict pressure drop in the pipe during the horizontal pneumatic conveying of large coal particles, the Lagrangian coupling method and DPM (discrete particle model) simulation model was used in this paper. Based on the comparison of the experimental results, the feasibility of the simulation was verified and the pressure drop in the pipe was simulated. The simulation results show that when the flow velocity is small, the simulation results of the DPM model are quite different from that of the experiment. When the flow velocity is large, the large particle horizontal pneumatic conveying behavior predicted by the model is feasible, which can provide a simulation reference for the design of the coal pneumatic conveying system.

An Experimental Study of Swirling Flow Pneumatic Conveying System in a Vertical Pipeline

1998 ◽  
Vol 120 (1) ◽  
pp. 200-203 ◽  
Author(s):  
Hui Li ◽  
Yuji Tomita
Keyword(s):  
Experimental Study ◽  
Pressure Drop ◽  
Power Consumption ◽  
Total Pressure ◽  
Swirling Flow ◽  
Axial Flow ◽  
Pneumatic Conveying ◽  
Air Velocity ◽  
Total Pressure Drop ◽  
Conveying System

A swirling flow is adopted for a vertical pneumatic conveying system to reduce conveying velocity, pipe wear, and particle degradation. An experimental study has addressed the characteristics of swirling flow pneumatic conveying (SFPC) for the total pressure drop, solid flow patterns, power consumption, and additional pressure drop. Polystyrene, polyethylene, and polyvinyl particles with mean diameters of 1.7, 3.1, and 4.3 mm, respectively, were transported as test particles in a vertical pipeline 12.2 m in height with an inside diameter of 80 mm. The initial swirl number was varied from 0.38 to 0.94, the mean air velocity was varied from 9 to 23 m/s, and the mass flow rate of the solids was varied from 0.3 to 1.25 kg/s. The minimum and critical air velocities decreased as much as 20 and 13 percent, respectively, when using SFPC. The total pressure drop and power consumption of SFPC are close to those of axial flow pneumatic conveying in the low air velocity range.

An Experimental Study of Swirling Flow Pneumatic Conveying System in a Horizontal Pipeline

1996 ◽  
Vol 118 (3) ◽  
pp. 526-530 ◽  
Author(s):  
Hui Li ◽  
Yuji Tomita
Keyword(s):  
Experimental Study ◽  
Pressure Drop ◽  
Power Consumption ◽  
Swirling Flow ◽  
Axial Flow ◽  
Pneumatic Conveying ◽  
Additional Pressure ◽  
System A ◽  
Test Particles ◽  
Conveying System

In order to reduce power consumption, pipe wear and particle degradation in pneumatic conveying system, a swirling flow pneumatic conveying (SFPC) system is proposed in this paper, and an experimental study focuses on the SFPC system in a horizontal pipeline in terms of the overall pressure drop, solid flow patterns, power consumption and the additional pressure drop. Polystyrene, polyethylene, and polyvinyl pellets with mean diameters of 1.7, 3.1, and 4.3 mm, respectively, were transported as test particles in a horizontal pipeline of 13 m length and 80 mm inside diameter. The initial swirl number was varied from 0.58 to 1.12, the mean air velocity from 9 m/s to 24 m/s, and the solid mass flow rate from 0.43 kg/s to 1.17 kg/s. It is found that in the lower gas velocity range, the pressure drop, the power consumption and additional pressure drop for SFPC were lower than those for axial flow pneumatic conveying. The critical and minimum air velocities were decreased by SFPC, the maximum reduction rates being 13 and 17 percent, respectively. The fluctuation of wall static pressure for SFPC was also decreased.

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