Pneumatic Conveying Characteristics Research Articles

Influence of the Replenishment Methods of the Sending Tanks on Pneumatic Conveying Characteristics

AbstractData on pressure signals and gas flow rate signals was collected under various experimental conditions. A comparative analysis was conducted to investigate the gradient changes of the fluidizing gas, the supplemental gas, and the pressurizing gas. A three‐factor three‐level orthogonal experiment was carried out. The results demonstrated that the proper use of the fluidizing gas can enhance the steady condition of the conveying process. Increasing the flow rate of the supplemental gas can improve the steady flow pattern, while the pressurizing gas has the opposite effect. The degree of influence of these parameters on the steady condition of the conveying process was shown to follow the order of fluidizing gas valve opening, pressurizing gas valve opening, and regulating gas valve opening.

Effects of Suction Velocity and Particle Diameter on Pneumatic Conveying Characteristics of ‍Suction Nozzle with Injection Pipe

Effects of Suction Velocity and Particle Diameter on Pneumatic Conveying Characteristics of ‍Suction Nozzle with Injection Pipe

Determination of Pneumatic Conveying Characteristics of Canola

In this study, it was aimed to determine the pneumatic conveying characteristics of canola seeds (Brasicca napus Oleifera sp). The physical properties, pressure drop, air velocity, power consumption characteristics of Turan variety canola seeds were investigated. Three different canola moisture, three different pipe diameters, three different material feed flow rates and five different air velocities were used and the effects of these factors on the pneumatic conveying characteristics of the canola were examined. The pneumatic conveying of canola seeds was carried out at the positive pressure pneumatic conveyor. The pressure drop and power consumption have increased with the increase of air velocity. The lowest pressure drop and power consumption values were obtained in conveying with pipe diameter of 70.3 mm, canola moisture of 16.54%, compressor speed of 1150 rpm and conveying capacity of 3.89 t/h. The lowest power consumption was achieved with the conveying of the canola at 6.36% moisture, 7.49 t/h material feed flow rate and 1150 rpm compressor speed. In trials, the pressure drop decreased when the pipe diameter was increased.

吹出し管を備えた吸込みノズルの空気輸送特性におよぼす吸込みノズル深さおよび吹出し管挿入長さの影響

吹出し管を備えた吸込みノズルの空気輸送特性におよぼす吸込みノズル深さおよび吹出し管挿入長さの影響

Study on Pneumatic Conveying Characteristics of Suction Nozzle with Annular Injection Pipe

Study on Pneumatic Conveying Characteristics of Suction Nozzle with Annular Injection Pipe

Study on Pneumatic Conveying Characteristics of Suction Nozzle with Annular Injection Pipe

Study on Pneumatic Conveying Characteristics of Suction Nozzle with Annular Injection Pipe

Effect of Injection Port Position on Pneumatic Conveying Characteristics of Suction Nozzle with Injection Pipe

Effect of Injection Port Position on Pneumatic Conveying Characteristics of Suction Nozzle with Injection Pipe

Experimental Study on Pneumatic Conveying Characteristics of Suction Nozzle with Annular Injection Pipe

Experimental Study on Pneumatic Conveying Characteristics of Suction Nozzle with Annular Injection Pipe

吹出し管を備えた吸込みノズルの空気輸送特性に及ぼす粒子径の影響

吹出し管を備えた吸込みノズルの空気輸送特性に及ぼす粒子径の影響

Energy loss at bends in the pneumatic conveying of fly ash

An accurate estimation of the total pressure drop of a pipeline is important to the reliable design of a pneumatic conveying system. The present paper presents results from an investigation into the modelling of the pressure drop at a bend in the pneumatic conveying of fly ash. Seven existing bend models were used (in conjunction with solids friction models for horizontal and vertical straight pipes, and initial acceleration losses) to predict the total pipeline pressure drop in conveying fly ash (median particle diameter: 30μm; particle density: 2300kg/m3; loose-poured bulk density: 700kg/m3) in three test rigs (pipelines with dimensions of 69mm inner diameter (I.D.)×168m length; 105mm I.D.×168m length; 69mm I.D.×554m length). A comparison of the pneumatic conveying characteristics (PCC) predicted using the seven bend models and experimental results shows that the predicted total pipeline PCC and trends depend on the choice of bend model. While some models predict trends that agree with the experimental results, other models predicted greater bend pressure drops for the dense phase of fly ash than for the dilute phase. Models of Pan, R. (1992). Improving scale-up procedures for the design of pneumatic conveying systems. Doctoral dissertation, University of Wollongong, Australia, Pan, R., & Wypych, P.W. (1998). Dilute and dense phase pneumatic conveying of fly ash. In Proceedings of the sixth International Conference on Bulk Materials Storage and Transportation (pp. 183–189), Wollongong, NSW, Australia and Chambers, A.J., & Marcus, R.D. (1986). Pneumatic conveying calculations. In Proceedings of the second International Conference on Bulk Materials Storage and Transportation (pp. 49–52), Wollongong, Australia reliably predicted the bend losses for systems conveying fly ash over a large range of air flows.

406 Effect of Suction Velocity on Pneumatic Conveying Characteristics of Suction Nozzle with Injection Pipe

406 Effect of Suction Velocity on Pneumatic Conveying Characteristics of Suction Nozzle with Injection Pipe

405 Effect of Suction Velocity on Pneumatic Conveying Characteristics of Suction Nozzle with Injection Pipe

405 Effect of Suction Velocity on Pneumatic Conveying Characteristics of Suction Nozzle with Injection Pipe

616 吹出し管を備えた吸込みノズルの空気輸送特性に及ぼす粒径の影響 : 第1報,ノズル深さを付加しない場合

616 吹出し管を備えた吸込みノズルの空気輸送特性に及ぼす粒径の影響 : 第1報,ノズル深さを付加しない場合

624 吹出し管を備えた吸込みノズルの空気輸送特性に及ぼす粒径の影響 : 第2報,ノズル深さを付加した場合

624 吹出し管を備えた吸込みノズルの空気輸送特性に及ぼす粒径の影響 : 第2報,ノズル深さを付加した場合

Investigating Straight-Pipe Pneumatic Conveying Characteristics for Fluidized Dense-Phase Pneumatic Conveying

This article presents results from an investigation into the pneumatic conveying characteristics (PCC) for horizontal straight-pipe sections for fluidized dense-phase pneumatic conveying of powders. Two fine powders (median particle diameter: 30 and 55 µm; particle density: 2300 and 1600 kg m−3; loose-poured bulk density: 700 and 620 kg m−3) were conveyed through 69 mm I.D. × 168 m, 69 mm I.D. × 148 m, 105 mm I.D. × 168 m and 69 mm I.D. × 554 m pipelines for a wide range of air and solids flow rates. Straight-pipe pneumatic conveying characteristics obtained from two sets of pressure tappings installed at two different locations in each pipeline have shown that the trends and relatively magnitudes of the pressure drops can be significantly different depending on product, pipeline diameter and length and location of tapping point in the pipeline (indicating a possible change in transport mechanism along the flow direction). The corresponding models for solids friction factor were also found to be different. There was no distinct pressure minimum curve (PMC) in any of the straight-pipe PCC, indicating a gradual change in flow transition (change in flow mechanism from dense to dilute phase). For total pipeline conveying characteristics, the shapes of the PCC curves and the location of the PMC were found to be significantly influenced by pipeline layout (e.g., location and number of bends) and not entirely by the dense-to-dilute-phase transition of flow mechanism. Seven existing models and a new empirically developed model for PMC for straight pipes have been evaluated against experimental data.

Effect of Blow Tank Type and Powder Properties on Dense Phase Pneumatic Conveying Characteristics of Two Fuel Powders at High Pressure

Effect of Blow Tank Type and Powder Properties on Dense Phase Pneumatic Conveying Characteristics of Two Fuel Powders at High Pressure

Effect of Operating Conditions and Powder Properties on Pneumatic Conveying Characteristics of a Top Discharge Blow Tank

AbstractThe effects of fluidizing and pressurizing gas flow rates on pneumatic conveying characteristics such as powder mass flow rate, solid‐gas ratio, and voidage in a top discharge blow tank pneumatic conveying system are evaluated. Pulverized coal and glass beads were used to investigate the effect of powder properties on conveying performance. The results indicate that as the fluidizing gas flow rate increases, the powder mass flow rate and the solid‐gas ratio increase at first and then decline. As the pressurizing gas flow rate increases, the powder mass flow rate increases gradually, while the solid‐gas ratio increases at first and then declines. Since the voidage values of all experiments are below 0.95, it can be inferred that the top discharge blow tank pneumatic conveying system is able to achieve dense‐phase conveying.

203 吹出し管を備えた吸込みノズルの空気輸送特性に及ぼす平均粒径の影響(流体工学(内部流れ))

203 吹出し管を備えた吸込みノズルの空気輸送特性に及ぼす平均粒径の影響(流体工学(内部流れ))

Effect of Nozzle Depth on Pneumatic Conveying Characteristics of Suction Nozzle with Injection Pipe

In the vacuum system of pneumatic transport, the authors have proposed, that a suction nozzle equipped with an injection pipe at the center, would provide a highly-dense therefore a highly-efficient method of transporting a powder. In this paper, we examine the effect of nozzle length, the inserted depth of the suction nozzle into the powder bed. The resulting data show that the nozzle performance improved in a range of lower nozzle depths, but saturated in a range of higher nozzle depths with no insertion length of injection pipe. The powder behavior near the suction nozzle at different nozzle depths was observed with powder flow visualization.

620 吹出し管を備えた吸込みノズルの空気輸送特性に及ぼすノズル深さの影響 : 吹出し管挿入長さを0とした場合(GS 流体工学VI)

620 吹出し管を備えた吸込みノズルの空気輸送特性に及ぼすノズル深さの影響 : 吹出し管挿入長さを0とした場合(GS 流体工学VI)