Analysis of Low Velocity Dense Phase Pneumatic Conveying System to Extend System Conveying Capability

2011 ◽  
Vol 239-242 ◽  
pp. 112-115
Author(s):  
Sheng Ming Tan ◽  
Bin Chen ◽  
Kenneth Charles Williams ◽  
Mark Glynne Jones
Keyword(s):  
Slug Flow ◽  
Pneumatic Conveying ◽  
Dense Phase ◽  
Bulk Materials ◽  
Air Velocity ◽  
Low Velocity ◽  
Lower Velocity ◽  
Pipe Line ◽  
Conveying System ◽  
Velocity Zone

This paper reports the current development of technologies to analyse the conveying performance of bypass low velocity dense phase pneumatic conveying system for transporting powder bulk materials and slug flow low velocity dense phase pneumatic conveying system for transporting granular sized bulk materials. It reveals that the bypass system can be operated at a lowered air velocity than conventional pipe line and slug flow system can be also controlled to operate at a lower velocity zone. Hence these technologies have the potential to extend the conveying capability of a pneumatic conveying system to a broader range of materials, also provide better performance in reduction in pipe wear and product degradation.

An Experimental Study of Horizontal Self-Excited Pneumatic Conveying

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
Fei Yan ◽  
Akira Rinoshika
Keyword(s):  
Pressure Drop ◽  
Power Consumption ◽  
Pneumatic Conveying ◽  
Velocity Range ◽  
Air Velocity ◽  
Additional Pressure ◽  
Polyethylene Particles ◽  
Conveying System ◽  
Frequency Features ◽  
Minimum Velocity

A new pneumatic conveying system that applies soft fins mounted vertically on a center plane of pipe in the inlet of the gas-particle mixture is developed to reduce power consumption and conveying velocity. The effect of different fin’s lengths on a horizontal pneumatic conveying is experimentally studied in terms of the pressure drop, conveying velocity, power consumption, particle flow pattern, and additional pressure drop. The test pipeline consisted of a horizontal smooth acrylic tube with an inside diameter of 80 mm and a length of about 5 m. Two kinds of polyethylene particles with diameters of 2.3 mm and 3.3 mm are used as conveying materials. The superficial air velocity is varied from 10 to 17 m/s, and the solid mass flow rate is from 0.20 to 0.45 kg/s. Compared with conventional pneumatic conveying, the pressure drop, minimum and critical velocities, power consumption, and additional pressure drop can be reduced by using soft fins in a lower air velocity range, and the efficiency of fins becomes more evident when increasing the length of the fins or touching particles stream by the long fins. The maximum reduction rates of the minimum velocity and power consumption by using soft fins are about 20% and 31.5%, respectively. The particle concentrations of using fins are lower than those of non-fin near the bottom of the pipe and are higher than those of non-fin in the upper part of the pipe in the acceleration region. Based on analyzing the frequency features of the fin’s oscillation, the Strouhal number of more efficient fins is about St ≈ 0.75 in the air velocity range of lower than 13 m/s.

Experimental Research of Granular Silica Pneumatic Conveying System in Tyre Factory

2013 ◽  
Vol 561 ◽  
pp. 244-249
Author(s):  
Yong Li ◽  
Hong Jiang Li ◽  
Guang Li
Keyword(s):  
Experimental Research ◽  
Plug Flow ◽  
Pneumatic Conveying ◽  
Characteristic Parameters ◽  
Dense Phase ◽  
Open Pressure ◽  
The Stability ◽  
Tank Pressure ◽  
Conveying System

Through the experimental research of granular silica in dense phase pneumatic conveying in the tyre plants, the characteristic parameters of granular silica pneumatic conveying have been obtained. By adjusting the main and bypass pipe pressure values, the stable plug flow conveying of granular silica can be realized, which considerably reduces the broken ratio of the granular silica. The plug flow conveying will be even more stable, when the opening blow tank pressure is set at zero. Additionally the same research has also proven that bypass valves open pressure in the end of pipeline will affect the stability of the entire conveying system as well.

Solids deposition in low-velocity slug flow pneumatic conveying

2005 ◽  
Vol 44 (2) ◽  
pp. 167-173 ◽  
Author(s):  
J. Li ◽  
C. Webb ◽  
S.S. Pandiella ◽  
G.M. Campbell ◽  
T. Dyakowski ◽  
...  
Keyword(s):  
Slug Flow ◽  
Pneumatic Conveying ◽  
Low Velocity ◽  
Solids Deposition

Numerical Simulation and Analysis of Carbon Black in Pneumatic Conveying Pipe

2014 ◽  
Vol 1052 ◽  
pp. 561-566
Author(s):  
Zhi Hua Li ◽  
Yan Qing Yang ◽  
Ya Zhou Yu ◽  
Guang Peng Liu ◽  
Xu Chao Li
Keyword(s):  
Carbon Black ◽  
Cross Section ◽  
Fluid Pressure ◽  
Flow State ◽  
Pneumatic Conveying ◽  
Dense Phase ◽  
Bent Pipe ◽  
The Mathematical Model ◽  
Research And Design ◽  
Conveying System

Based on establishment of the mathematical model about the carbon black dense phase pneumatic conveying, using computational fluid dynamics ( referred to as CFD) methods, this paper stimulated the carbon black flow state inside the bent pipe. Through simulation and analysis, the carbon black particles' flow condition along the bent pipe, the carbon black particles' distribution variation at the bent pipe cross-section, the bent pipe part where worn most easily, the fluid pressure cloud and the optimum R/D have been gotten. All these provide basis for the research and design of carbon black dense phase 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.

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