Numerical and experimental study of an innovative pipeline design in a granular pneumatic-conveying system
TL;DR: In this paper, a perforated double tube was proposed to reduce the pressure drop and power consumption in a gas-solid mixture conveying pipeline. But the model was not validated and the power consumption was not analyzed experimentally.
About: This article is published in Particuology.The article was published on 2017-11-24. It has received 11 citations till now. The article focuses on the topics: Pressure drop.
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TL;DR: In this article, a side inlet guide vane swirling generator was developed and employed to study the efficiency and stability of lump coal particles in swirling flow pneumatic conveying, and the results showed that the swirling flow has better energy preservation characteristics and conveying performance in proper conditions.
Abstract: To clear the swirling flow pneumatic conveying performance for blocky fuel particles, particularly for lump coal particles, a side inlet guide vane swirling generator was developed and employed to study the efficiency and stability of lump coal particles in swirling flow pneumatic conveying. In total, 32 pilot scale tests for different conditions, including different airflow rates, solid mass flow rates, and swirling intensities, were conducted in this paper. The efficiency and stability of lump coal particles in swirling flow pneumatic conveying are thoroughly discussed by considering the static pressure loss and pressure fluctuation standard deviation. The pressure characteristics for different conveying stages and frequency spectrum constituents of the static pressure are also discussed. The results show that the swirling flow has better energy preservation characteristics and conveying performance in proper conditions. Four main factors contribute to the static pressure fluctuation in three different frequency bands. The results also show that a low mean gas velocity with a medium swirling intensity and a high mean gas velocity with a weak swirling intensity can improve the conveying stability. The swirling flow is more stable at the front of the pipeline; meanwhile, the axial flow is better in the second half.
12 citations
02 Jul 2018
TL;DR: This paper investigates and reviews various solutions to reduce the magnitude of erosion of bends resulting in enhanced life of the components and highlights the future directions that could mitigate the problem of erosive wear.
Abstract: Pneumatic Conveying System (PCS) is widely used to transport powdered and granular materials. If the conveyed material is hard and abrasive, it leads to erosion of bends and other surfaces, like diverter valves, which enforce a directional change and make the transport operations unsafe and unreliable. Researchers have attempted a variety of solutions to reduce the severity of erosion in such cases. New materials have been used, different bend geometries have been investigated, and flow improvements have also been tried out. This paper investigates and reviews various solutions to reduce the magnitude of erosion of bends resulting in enhanced life of the components. It also highlights the future directions that could mitigate the problem of erosive wear.
10 citations
TL;DR: In this paper, an oscillator is mounted with a 45° oblique plane through the pipe axis in order to reduce the power consumption of a horizontal-vertical pneumatic conveying system.
7 citations
TL;DR: In this paper, a mathematical and physical model of the critical pneumatic conveying modes has been developed to ensure the calculation and construction of Pneumatic product pipelines of continuous operation, taking into account the technological conditions of gas suspension movement; the laws of movement of individual fine particles, accounting for their impact interaction and decompression, as well as the actual boundary conditions for a food product movement.
Abstract: A mathematical and physical model of the critical pneumatic conveying modes has been developed to ensure the calculation and construction of pneumatic product pipelines of continuous operation. The model takes into consideration the technological conditions of gas suspension movement; the laws of movement of individual fine particles, accounting for their impact interaction and decompression, as well as the actual boundary conditions for a food product movement. The parameters of the zone of dynamic destruction of the layer of a small-piece food product by impact airwave were experimentally studied; the results of the calculation have been compared with the experimental data. The process of managing critical pneumatic conveying modes has been theoretically described, based on the proportional elements and feedback (a current loop of 4‒20 mA); the process of destruction of the cluster of products by airwave and controlled decompression has been studied. The process of pneumatic conveying of a small-piece product at the experimental bench system has been examined. As well as the process of moving the material in the product pipeline, which is controlled by compressed air pulses, to maintain the modes of operation. The following has been established: pressure losses caused by the movement of clean air; additional pressure losses resulting from the movement of the material; the loss of pressure required for transporting in a suspended state on a vertical stretch. A model has been developed to calculate the coordinates of a product particle when it collides with the inner surface of the product pipeline, as well as a change in its kinematic characteristics. The developed model makes it possible to determine the rational modes of pneumatic conveying and possible energy costs in the processing of various small-piece materials. The rational pneumatic conveying regimes have been determined, as well as possible energy costs in the processing of small-piece materials. As the time of supplying compressed air in the product pipeline increases, the number of product particles reaches a maximum in the range of 0.1...0.2 s. The compressed air flow rate, depending on the value of inlet mainline pressure P (0.1…0.3 MPa), is 80…160 (Nl/min). A general approach to the modeling of pneumatic conveying systems has been proposed
4 citations
TL;DR: In this paper, the authors focused on the particles motion characteristic of bend on the horizontal-vertical pneumatic conveying with oscillatory flow (generated by installing the oscillator) in terms of on pressure drop, powder consumption, the evolution of particle velocity and particle fluctuating intensity during flowing through bends.
4 citations
References
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Book•
01 Jan 1989
TL;DR: A review of pneumatic conveying systems can be found in this paper, with a focus on the air flow rate evaluation and a discussion of the material properties of conveying.
Abstract: Systems and Components: Introduction to pneumatic conveying and the guide. Review of pneumatic conveying systems. Pipeline feeding devices. Pipelines and valves. Air movers. Gas-solid separation devices. System selection considerations. System Design: Air flow rate evaluation. Air only relations. Conveying characteristics. Conveying capability. Material property influences. Pipeline scaling parameters. Design procedures. Case studies. First approximation design methods. Multiple use systems. System Operation: Troubleshooting and material flow problems. Optimizing and up-rating of existing systems. Operating problems. Erosive wear. Particle degradation. Moisture and condensation. Health and safety. Appendix 1: Determination of relevant material properties. Appendix 2: Additional conveying data. Index.
192 citations
TL;DR: In this paper, the particle behavior and the pressure drop in a particle-laden six meter long horizontal channel with rectangular cross-section from both experimental and numerical perspectives are related to the particle behaviour.
112 citations
TL;DR: In this paper, the physical properties of vetch seed were evaluated as a function of moisture content, and the results showed that the number of seed mass increased from 55·47 to 59·03 grams, the projected area from 23·52 to 29·05mm2, the sphericity from 0·837 to 0.859, the true density from 1286·2 to 1369·9 kg m−3, the porosity from 33·08% to 39·68% and the terminal velocity from 9·94 to 10·33 m s
111 citations
Journal Article•
TL;DR: The physical and mechanical properties of soybeans were determined at 8 to 16% moisture content as discussed by the authors, where grain length, width, thickness, arithmetic average diame- ter and geometric average diameter increased from 7.24 to 8.14 mm.
Abstract: Thephysical and mechanical properties of soy- bean were determined at 8 to 16% moisture content. In this moistu- re range, grain length, width, thickness, arithmetic average diame- ter and geometric average diameter increased from 7.24 to 8.19, 6.79-7.12, 5.78-6.23, 6.60-7.18, 6.57-7.14 mm, respectively. The volume of grain and area of grain surface increased linearly from 130.97 to 160.32 and from 125.46 to 144.39 mm 2 , respectively. The sphericity, bulk density, true density and porosity decreased linearly from 0.91 to 0.87, 766.12-719.00, 983.33-905.67 kg m -3 and 22.58 to 20.61%, respectively. The angle of internal friction in- creased linearly from 27.37 to 31.81 with the increase of moisture content. The static coefficient of friction increased from 0.385 to 0.571, 0.304-0.441 and 0.164-0.286 for concrete, wood and galva- nized steel surfaces, respectively.
92 citations
TL;DR: In this paper, the capacity limitation of low-velocity slug-flow pneumatic conveying is investigated and a new theoretical model based on observed unstable flow mechanisms and stability criteria is presented for the purpose of predicting transport boundaries.
75 citations