A review of pneumatic conveying status, advances and projections

Klinzing, George E.

doi:10.1016/j.powtec.2018.04.012

Cited by 97 publications

(48 citation statements)

References 36 publications

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“…During drill cutting transportation, the Reynolds number is greater than 500, placing it in the Newtonian inertial resistance zone. 39 Therefore, K = 0.…”

Section: Drill Cutting Transport Capacitymentioning

confidence: 99%

Evaluating the maximum rate of penetration for drilling borehole in soft coal seam

Yang

Wen

Yan

et al. 2020

Energy Science & Engineering

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Most coal seams in China are characterized by high‐gas pressure and high‐gas content, which seriously threaten the safety of coal mines. Gas extraction is an effective measure for preventing gas disasters. However, the drilling process in soft coal seams is inefficient; it is difficult for the boreholes to reach the design length. The rate of penetration (ROP) plays an important role in determining drilling efficiency and borehole length in soft coal seams. In this study, we establish a simplified ROP model for soft coal seams and evaluate the maximum ROP of Hebi No. 6 coal mine. First, the drill cutting transport capacity of the drilling system and drill cutting quantity generated during the drilling process are analyzed. By simplifying drill cutting transport and coal seam properties, the ROP model is established. Second, the Rock Failure Process Analysis software is used to analyze the deformation region of boreholes, which has a great influence on the drill cutting transport space. Finally, a field test is implemented in Hebi No. 6 coal mine in Henan Province, China, to verify the model, and we propose a measure to control the ROP below the maximum value to increase the length of the borehole. The test results indicate that the model has high accuracy, with errors less than 15%, and the lengths of boreholes in air‐return and transportation roadways are increased to 60 and 80 m, respectively, and the increase rate is greater than 50%.

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“…During drill cutting transportation, the Reynolds number is greater than 500, placing it in the Newtonian inertial resistance zone. 39 Therefore, K = 0.…”

Section: Drill Cutting Transport Capacitymentioning

confidence: 99%

Evaluating the maximum rate of penetration for drilling borehole in soft coal seam

Yang

Wen

Yan

et al. 2020

Energy Science & Engineering

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“…Last research efforts in pneumatic conveyance with deep-background review of the current state of pneumatic conveying systems and also the status of electrostatic is presented in [11]. Different research confirmed the impacts of several variables on tribocharging of powders and electrostatic method's signal [12,13].…”

Section: Introductionmentioning

confidence: 95%

An electrostatic measuring technique for monitoring particle size in dilute pneumatic transport

Kuštrin

Jurjevčič²,

Senegačnik

2020

THERM SCI

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The goal of this research is to establish the applicability of an electrostatic measuring technique for monitoring the quality of a coal-milling process in direct-firing systems. Such systems are used in large steam boilers fired with low-rank coal where the pulverized coal is transported pneumatically from the mills to the burner nozzles via ducts with large cross-sections. The electrostatic measuring method, in connection with intrusive rod-type sensors, was studied because it provides good spatial sensitivity and cost effectiveness. A laboratory test rig was constructed, where the pulverized coal carried by ambient air was employed for the experiments emulating the pneumatic transport of coal particles in direct-firing systems. The test rig enables an extensive variation of the most influential parameters, like the mass flow, the velocity and the size of the particles. A linear, multiregression analysis of the results of the experiments was carried out and the appropriate regression model enabling a determination of the mean diameter of the particles using the electrostatic signal was chosen. Based on the results of the study the electrostatic measuring technique can be used for monitoring the size of pneumatically transported particles. The appropriate regression model needs to be chosen for each particular application to describe the dependency of the acquired electrostatic signal on the influential parameters of the pneumatic transport.

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“…It is necessary and possible to optimize new production technologies and equipment [20] in industry and engineering with regard to service life [21]. For example, there are problems with the flow of particulate solids when storing materials in silos [22] or during pneumatic transportation in pipelines [23]. In the pharmaceutical and chemical industry, material segregation or inappropriate distribution of the active substance may occur during processing.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Analysis and Optimization of Material Flow inside the System of Rotary Coolers and Intake Pipeline via Discrete Element Method Modelling

et al. 2018

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There is hardly any industry that does not use transport, storage, and processing of particulate solids in its production process. In the past, all device designs were based on empirical relationships or the designer’s experience. In the field of particulate solids, however, the discrete element method (DEM) has been increasingly used in recent years. This study shows how this simulation tool can be used in practice. More specifically, in dealing with operating problems with a rotary cooler which ensures the transport and cooling of the hot fly ash generated by combustion in fluidized bed boilers. For the given operating conditions, an analysis of the current cooling design was carried out, consisting of a non-standard intake pipeline, which divides and supplies the material to two rotary coolers. The study revealed shortcomings in both the pipeline design and the cooler design. The material was unevenly dispensed between the two coolers, which combined with the limited transport capacity of the coolers, led to overflowing and congestion of the whole system. Therefore, after visualization of the material flow and export of the necessary data using DEM design measures to mitigate these unwanted phenomena were carried out.

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A review of pneumatic conveying status, advances and projections

Cited by 97 publications

References 36 publications

Evaluating the maximum rate of penetration for drilling borehole in soft coal seam

Evaluating the maximum rate of penetration for drilling borehole in soft coal seam

An electrostatic measuring technique for monitoring particle size in dilute pneumatic transport

Analysis and Optimization of Material Flow inside the System of Rotary Coolers and Intake Pipeline via Discrete Element Method Modelling

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