The Experts below are selected from a list of 36 Experts worldwide ranked by ideXlab platform
David Mills - One of the best experts on this subject based on the ideXlab platform.
-
Case Study 2: A Coarse Material
Pneumatic Conveying Design Guide, 2016Co-Authors: David MillsAbstract:In this case study a material is selected that has no low-velocity dense phase conveying capability and so all the scaling is in terms of relatively high-velocity dilute phase suspension flow conveying. The operating pressure has been limited to 1 bar gauge and so it is applicable to one of the most common pneumatic conveying systems in industry, being the low-pressure rotary valve as a feeding device and a Roots-type blower for the air supply. Other combinations, of course, are equally applicable, as well as vacuum or higher pressure operation. Once again the scaling is from data obtained for the given material in a test facility and so involves scaling in terms of differences in Pipeline Bore, conveying distance, Pipeline orientation, and number of bends. The specification is in terms of the air supply pressure, Pipeline Bore, and airflow rate required in order to achieve the given duty. The power required for the conveying system and the solids loading ratio at which the material will be conveyed are evaluated, as well as the specific cost of operating the system.
-
Pipeline Scaling Parameters
Pneumatic Conveying Design Guide, 2016Co-Authors: David MillsAbstract:For the reliable design of a pneumatic conveying system, actual conveying data for the material to be conveyed is required. If this is not available, it would be recommended that the material should be tested in order to obtain the data. A test facility should be used, or possibly data that has been obtained from another installation, but the actual Pipeline configuration does not have to be the same or replicated. Scaling parameters are presented in this chapter that will allow such data from one Pipeline to be scaled to that of the required facility. Differences in Pipeline Bore, conveying distance, number and geometry of bends, and Pipeline orientation can all be taken into account. For a given plant Pipeline, a number of different combinations of Pipeline Bore and air supply pressures will generally be capable of meeting the required duty. Such an analysis is included and it is shown how the choice of conveying parameters can influence both the cost of operating the plant, in terms of power requirements, and the potential capital cost of the plant.
-
Chapter 17 – Design Procedures
Pneumatic Conveying Design Guide, 2016Co-Authors: David MillsAbstract:Logic diagrams are presented for the design of pneumatic conveying systems based on the use of both mathematical models and conveying data. Logic diagrams are also presented for checking the performance of an existing system, or for a potential change of duty, again based on the use of both models and data. There is rarely a single solution to the specification of a pneumatic conveying system for a given duty. As a consequence the logic diagrams include numerous checks so that optimum solutions are achieved in terms of either obtaining the minimum power requirement for a given duty, or achieving a maximum material flow rate for the given conveying parameters. To help in this process several series of design curves are included to illustrate the potential influence of the major system variables such as conveying distance, Pipeline Bore, and air supply pressure, as well as the problematical issue of material type.
-
First approximation design methods
Pneumatic Conveying Design Guide, 2016Co-Authors: David MillsAbstract:For feasibility studies an approximate solution to a problem will often suffice in the first instance so that a reasonable order of magnitude of the variables involved can be obtained, particularly if a comparison is to be made with alternative mechanical means of conveying a material. This will give sufficient details of the pneumatic conveying system in terms of Pipeline Bores, air supply pressures, and airflow rates for a given duty, in terms of material flow rate and conveying distance required, so that capital cost estimates for plant items such as Pipelines, compressors, feeding devices, and filtration plant can be made. Operating costs for the plant are also likely to be required and so with data on airflow rate and air supply pressure required, this is a straightforward procedure. As was shown in previous chapters, a given duty can generally be achieved with a range of air supply pressure and Pipeline Bore combinations, and so this method of analysis will enable the best combination of conveying parameters to be achieved for the given duty.
-
Chapter 15 – Design procedures
Pneumatic Conveying Design Guide, 2004Co-Authors: David MillsAbstract:Publisher Summary A pneumatic conveying system is designed using mathematical models, available test data, or a combination of the two. If mathematical models are to be used, some degree of confidence needs to be established as to their suitability for a particular application, such as conveying a particular material under closely defined conditions, before they are employed. Test data is used extensively in system design. However, it is essential that the available data relates to the same grade of material for which the new plant design is required. It is also essential that the data is available to slightly higher values of solids loading ratio and to slightly lower values of conveying line inlet air velocity, than are contemplated for the new design. Further, the chapter discusses a logic diagram for the design of a pneumatic conveying system based on the use of mathematical models. The final requirement in the design process is to specify the Pipeline Bore required and the necessary rating of the air mover.
Richard J. Farnish - One of the best experts on this subject based on the ideXlab platform.
-
Power consumption and profit margins - less is more
1997Co-Authors: Richard J. FarnishAbstract:The effects of material properties, Pipeline Bore, routing and mode of flow used on the power consumption of pneumatic conveying systems are studied. An equation is developed to give an estimation of the power consumption in a conveying Pipeline. Two modes of flow are used to convey the materials: lean phase and dense phase. It was observed that different materials require different power consumption and dependency curves for power consumption in lean and dense phase have unique characteristics and retain them in different Pipeline configuration. Power consumption in lean phase is influenced by the number of bends while in the dense phase, it is influenced by length of run of the pipe.
Kaushika Hettiaratchi - One of the best experts on this subject based on the ideXlab platform.
-
a comparison between the pressure gradients in vertical and horizontal pneumatic conveying with an investigation into the effect of Pipeline Bore in vertical conveying
2006Co-Authors: Kaushika HettiaratchiAbstract:This study was initiated by the need to improve current techniques used in the design of pneumatic conveying systems. At present, the commonly used method to predict the pressure drop in a vertical Pipeline in a pneumatic conveying system is to obtain the pressure gradient in a horizontal for the identical conveying conditions and double the pressure gradient in the horizontal Pipeline to give the pressure gradient in the vertical Pipeline. In addition, scaling for Pipeline Bore in vertical Pipelines is simply undertaken by considering the change in cross-sectional area. This is another area where sufficient investigation has not been undertaken. Therefore, as part of remit of this research study into improving current design techniques, an investigation into the effect of Pipeline Bore in vertical conveying would also be undertaken. This thesis documents the systematic approach that was used in order to produce some usable models that may be used in improving the understanding and design of pneumatic conveying systems. The models produced were based on data obtained by testing a range of products in an industrial scale pneumatic conveying test facility. The experimental data that was obtained from the pneumatic conveying tests form the basis of the ensuing analysis. The basic experimental data, which is primarily in the form of pressure gradient data for pneumatic conveying in horizontal and vertical Pipelines, is explained in detail, along with the subsequent analysis of the data.
A R Reed - One of the best experts on this subject based on the ideXlab platform.
-
the dependence of power consumption of pneumatic conveying systems upon bulk material properties Pipeline Bore and routing and mode of flow
Proceedings of the Institution of Mechanical Engineers Part E: Journal of Process Mechanical Engineering, 1995Co-Authors: T Schuster, M S A Bradley, A R ReedAbstract:In this paper the dependence of the power consumption of pneumatic conveyors upon conveyed materials, Pipeline route and Bore, and mode of flow has been examined. The findings are that, with different materials and modes of flow, not only is the amount of power consumed very different but it varies in different ways with pipe Bore and routing. Additionally it has been found that, for any given conveying system, the choice of air mover also has a strong influence on the power requirement.
T Schuster - One of the best experts on this subject based on the ideXlab platform.
-
the dependence of power consumption of pneumatic conveying systems upon bulk material properties Pipeline Bore and routing and mode of flow
Proceedings of the Institution of Mechanical Engineers Part E: Journal of Process Mechanical Engineering, 1995Co-Authors: T Schuster, M S A Bradley, A R ReedAbstract:In this paper the dependence of the power consumption of pneumatic conveyors upon conveyed materials, Pipeline route and Bore, and mode of flow has been examined. The findings are that, with different materials and modes of flow, not only is the amount of power consumed very different but it varies in different ways with pipe Bore and routing. Additionally it has been found that, for any given conveying system, the choice of air mover also has a strong influence on the power requirement.