Study on velocity distribution of large particle in vertical slurry pipeline

Abstract

Velocity distribution of vertical pipes with large particle slurry plays an important role in pipeline transportation of minerals in hydraulic coal mining and ocean mining industry. The experiments of particle fluidization and particle vertical lift are conducted and the fluidization data of three kinds of large particles are analyzed. The results show that the vortex resistance prevents particles from moving as the coarse particles move in vertical pipes. An additional coefficient method is proposed to study the vortex resistance by increasing the coefficient of vortex resistance before interference. Mathematical model is established to describe the drag coefficient of the vortex by analyzing the influence factors of the experimental data and the drag coefficient of the vortex. In addition, calculation model of the velocity distribution of large particles in vertical pipe is proposed by analyzing the force, the fluid, and the solid momentum. Moreover, the experimental data of particle transport in vertical pipes are utilized to verify and analyze the proposed model.

Preliminary Evaluation of Methods for Continuous Carbon Removal from a Molten Catalyst Bubbling Methane Pyrolysis Reactor

“…This is of relevance, as many of the concepts are intrinsically reliant upon pneumatic conveyance. The saltation velocity (v SALT ) was estimated (Equation ( 4)) using the Rizk correlation [23], as follows:…”

“…The second contribution is the identification, development and subsequent testing of mechanisms or methods for carbon removal. This work aims to adapt technologies from other industries, namely, an overflow weir [16], pneumatically assisted overflow weir [17][18][19], venturi ejector [21] and cyclone extractor [23], for use in methane pyrolysis reactors. The challenge of carbon removal has limited previous processes to batch operation [13]; thus, the development of a suitable technology for its continuous removal opens the door to continuous hydrogen production [14].…”

“…These studies have reported considerable success in removing particles with a range of diameters [21,22]. The use of cyclonic flow for particle separation and mixing is also widely applied across a range of particle sizes [23], which is a specific application of cyclone separators. However, to the best of the author's knowledge, no specific reports are available of the performance of the use of pneumatic conveyance, venturi vacuums and cyclone flow for the removal of carbon particles under conditions of relevance to a molten catalyst methane pyrolysis bubble column reactor.…”