Particle Characteristics and Analysis Using a Laser-Based Phase Doppler Particle Analyzer (PDPA) and Statistical Method

Lee, Seong W.; Cui, Hu J.; Huang, Yan

doi:10.1080/02726350903328845

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…When the upper limit of the particle size of gangue is reduced to less than 3mm, the experimental results of samples 3 and 4 show that the stability of the gangue slurry is good, the slurry basically remains homogeneous in the diffusion process, and there is no obvious accumulation of large particles in the middle. Therefore, it is considered that the gangue powder with particle grading of samples 3 and 4 can be made into stable slurry (Lee et al, 2009;Zhou et al, 2021).…”

Section: Slump Test Of Gangue Slurrymentioning

confidence: 99%

Research on key parameters of pipeline transportation of waste rock treatment in underground residual space

Zhu

Song

2023

Front. Earth Sci.

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As the key link of coal gangue slurry filling, slurry pipeline transportation is an important guarantee to realize the slurry mixing and safe transportation of gangue from solid powder. To realize the underground excavation gangue of the Huangling No. 2 coal mine without raising the ground, the slurry filling technology is proposed to transport the slurry made by gangue through the pipeline and fill it into the goaf. The phase composition and microstructure characteristics of underground excavation gangue in the Huangling No. 2 coal mine were analyzed by X-ray diffraction and an electron microscope scanning test, the slurry-forming properties of gangue powder with different particle sizes and gradations were studied, and the influence of gangue slurry concentration on its rheological properties was analyzed. The experimental results show that the gangue powder crushed using a cage crusher can be made into stable slurry when the particle grading size is the natural crushing gradation with the upper limit of particle size less than 3 mm. The viscosity of the slurry is positively correlated with the concentration. When the concentration is below 70%, the increase in viscosity is small, and when the concentration is above 70%, the increase in viscosity is significant. It is determined that the concentration of the Huangling No. 2 coal mine slurry is 70%. Based on the determination of slurry preparation parameters, the simulation analysis of slurry pipeline transportation was carried out, the influence of design velocity on the velocity distribution of the pipeline section and the variation law of slurry concentration was explored, and the design velocity of the project is determined to be 1.5 m/s. The engineering practice shows that the slurry preparation parameters are reasonable. The crushing and pulping of gangue under the ground and the safe transportation of a 6 km pipeline are realized, which provides a reference for similar engineering projects.

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Section: Slump Test Of Gangue Slurrymentioning

confidence: 99%

Research on key parameters of pipeline transportation of waste rock treatment in underground residual space

Zhu

Song

2023

Front. Earth Sci.

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“…[7,8] The recent results of the particle characteristics and analysis using PDPA were presented along with statistical methods. [9] A PDPA, also referred to as phase Doppler interferometer (PDI), is used to serve the research needs of several ongoing research programs dealing with droplet-based processes of metals and composites at University of California, Davis. Spray forming (also referred to as spray atomization and deposition) is a state-of-the-art technology for manufacturing droplet-based advanced materials that exhibit superior mechanical properties.…”

Section: Pdpa Systemmentioning

confidence: 99%

Innovative Coal Solids-Flow Monitoring and Measurement Using Phase-Doppler and Mie Scattering Techniques

Lee¹

2010

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Fuel flow to individual burners is complicated and difficult to determine on coal fired boilers, since coal solids were transported in a gas suspension that is governed by the complex physics of two-phase flow. The objectives of the project were the measurements of suspended coal solidsflows in the simulated test conditions. Various extractive methods were performed manually and can give only a snapshot result of fuel distribution. In order to measure particle diameter & velocity, laser based phase-Doppler particle analyzer (PDPA) and particle image velocimetry (PIV) were carefully applied. Statistical methods were used to analyze particle characteristics to see which factors have significant effect. The transparent duct model was carefully designed and fabricated for the laser-based-instrumentation of solids-flow monitoring (LISM).The experiments were conducted with two different kinds of particles with four different particle diameters. The particle types were organic particles and saw dust particles with the diameter range of 75~150 micron, 150~250 micron, 250~355 micron and 355~425 micron. The densities of the particles were measured to see how the densities affected the test results.Also the experiment was conducted with humid particles and fog particles. To generate humid particles, the humidifier was used. A pipe was connected to the humidifier to lead the particle flow to the intersection of the laser beam. The test results of the particle diameter indicated that, the mean diameter of humid particles was between 6.1703 microns and 6.6947 microns when the humid particle flow was low. When the humid particle flow was high, the mean diameter was between 6.6728 microns and 7.1872 microns. The test results of the particle mean velocity indicated that the mean velocity was between 1.3394 m/sec and 1.4556 m/sec at low humid particle flow. When the humid particle flow was high, the mean velocity was between 1.5694 m/sec and 1.7856 m/sec.The Air Flow Module, TQ AF 17 and shell ondina oil were used to generate fog particles. After the oil was heated inside the fog generator, the blower was used to generate the fog. The fog flew Page IV along the pipe to the intersection of the laser beam. The mean diameter of the fog particles was 5.765 microns. Compared with the humid particle diameter, we observed that the mean diameter of the fog particles was smaller than the humid particles. The test results of particle mean velocity was about 3.76 m/sec. Compared with the mean velocity of the humid particles, we can observed the mean velocity of fog particles were greater than humid particles.The experiments were conducted with four different kinds of particles with five different particle diameters. The particle types were organic particles, coal particles, potato particles and wheat particles with the diameter range of 63~75 micron, less than 150 micron, 150~250 micron, 250~355 micron and 355~425 micron.To control the flow rate, the control gate of the particle dispensing hopper was adjusted to 1/16 open rate, 1/8 ...

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Particle Characteristics and Analysis Using a Laser-Based Phase Doppler Particle Analyzer (PDPA) and Statistical Method

Cited by 2 publications

References 3 publications

Research on key parameters of pipeline transportation of waste rock treatment in underground residual space

Research on key parameters of pipeline transportation of waste rock treatment in underground residual space

Innovative Coal Solids-Flow Monitoring and Measurement Using Phase-Doppler and Mie Scattering Techniques

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