Experimental Research on Carbon Black Flowing in Pneumatic Conveying System

2009 ◽  
Vol 87-88 ◽  
pp. 256-262
Author(s):  
Zhi Hua Li ◽  
Yan Qing Liu ◽  
Peng Xia ◽  
Li Ma
Keyword(s):  
Carbon Black ◽  
System Design ◽  
Gas Flow ◽  
Particle Diameter ◽  
Diameter Distribution ◽  
Pneumatic Conveying ◽  
Gas Flow Rate ◽  
Dense Phase ◽  
Main Factors ◽  
Conveying System

The article analyses the main factors such as the species and character of the carbon black, the conveying pressure and gas-flow rate which influence the flow character of carbon black during pneumatic conveying. And also studies the flow character of carbon black in dense phase pneumatic conveying system with experiment. It raises the view that the carbon black with narrow particle diameter distribution, especially with bigger size is favorable for saving energy and reducing fragmentation; the conveying pressure approach lowest point should be chosen during carbon black pneumatic conveying, and the quantity of elbow pipe should be used as less as possible; on condition that the conveying capacity is guaranteed, the lower air feeding volume is preferable; the higher the conveying pressure is, the lower the fragmentation of the carbon black will be. The article also supplies the reference for technology parameter choosing and carbon black conveying system design.

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.

Study on the Flow Characteristics of High-Pressure and Dense-Phase Pneumatic Conveying of Different Pulverized Coal in IGCC Field

2012 ◽  
Author(s):  
Peng Lu ◽  
Dong Han ◽  
Wenhao Pu ◽  
Chen Yue
Keyword(s):  
High Pressure ◽  
Gas Flow ◽  
Bituminous Coal ◽  
Differential Pressure ◽  
Pulverized Coal ◽  
Pneumatic Conveying ◽  
Gas Flow Rate ◽  
Dense Phase ◽  
Total Differential ◽  
Gas Ratio

Entrained flow coal gasification is the key technology in IGCC field for its cleanness and high-efficiency. High-pressure and dense-phase pneumatic conveying of pulverized coal is of great importance for the entrained flow pulverized coal gasification. There are great differences between dense-phase pneumatic conveying systems at high pressure and common pneumatic conveying systems because of its lower conveying speed, high solid concentration and complex flow patterns. By changing conveying pressure, total differential pressure and fluidizing gas flow rate, experimental investigations were conducted on the conveying characteristics of pulverized coal with different coal category, different particle size, and different moisture content. The results showed that pneumatic conveying at high pressure is more propitious to obtain higher solid flux, higher solid-gas ratio and lower velocity transport. Solid flux increased with the total differential pressure but the trend was lowered at last due to the system limit. Solid-gas ratio increased at first and then decreased with the total differential pressure. Both solid flux and solid-gas ratio increased slightly with fluidizing gas flow rate at first and then decreased a little for the pulverized coal of two different particle sizes. Pulverized coal with the smaller particle size possessed better conveying ability and was easier to obtain higher solid-gas ratio. Solid flux of Inner Mongolia lignite decreased with the increasing moisture content in the pulverized coal. Conveying ability of Yanzhou bituminous coal was the best and Inner Mongolia bituminous coal was the worst among the three representative coal kinds in China tested. The characteristics of the pressure drops at different pipeline test sections were investigated considering the total differential pressure, solid-gas ratio, particle sizes and moisture content, respectively. Supplemental gas flow rate should be restricted to a range in order to transport successfully when conveying Inner Mongolia bituminous coal of 300μm. The work above will provide valuable experiences for future research on high-pressure and dense-phase pneumatic conveying of pulverized coal in IGCC field.

Study on the Dense Phase Pneumatic Conveying Property of Carbon Black

2011 ◽  
Vol 221 ◽  
pp. 228-234
Author(s):  
Zhi Hua Li ◽  
Jian Feng Liu ◽  
Lei Jiao ◽  
Lei Guo
Keyword(s):  
Carbon Black ◽  
Test Data ◽  
Flow Rate ◽  
Critical Value ◽  
Pneumatic Conveying ◽  
Air Flow Rate ◽  
Dense Phase ◽  
Experimental Process ◽  
Open Pressure ◽  
Conveying System

The dense phase pneumatic conveying system of carbon black and the experimental process are introduced in the paper. According to the test data, the factors that influence the carbon black conveying performance are analysed. This paper points out that the higher of air flow rate will increase the conveying capacity of carbon black, but will approach to a critical value. The open pressure of the blow pot has a optimal extent, in which the carbon black conveying time will be the shortest. This paper also points out that the longer the conveying distance, the higher the carbon black fragmentation rate.

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.

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.

Effect of Temperature Gradient near the Target and Gas Flow Rate on the Diameter Distribution of Single-Walled Carbon Nanotubes Grown by the Laser Ablation Technique

2000 ◽  
Vol 633 ◽  
Author(s):  
Rahul Sen ◽  
Hiromichi Kataura ◽  
Yohsuke Ohtsuka ◽  
Toshinobu Ishigaki ◽  
Shinzo Suzuki ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Laser Ablation ◽  
Temperature Gradient ◽  
Flow Rate ◽  
Gas Flow ◽  
Single Walled Carbon Nanotubes ◽  
Diameter Distribution ◽  
Gas Flow Rate ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

AbstractGas dynamic and time resolved imaging studies have been performed on the growth of single-walled carbon nanotubes (SWNTs) in the laser ablation process. SWNTs were synthesized by laser ablation of Ni-Co catalyzed graphite targets at 1200°C under argon flow. The effects of the temperature gradient near the target and the gas flow rate were studied in order to understand the effect of gas dynamics over the diameter distribution of SWNTs. The gas flow rate affects the diameter distribution of SWNTs especially when the growth species flow through a large temperature gradient. Scattering images from the growth species at different flow rates was recorded by high-speed video imaging. The results indicate that the velocities of these species are dependent on the gas flow rate but this dependence is evident 30 ms after the laser ablation. These findings are used to estimate the time period for the nucleation and the growth of SWNTs.

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