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David Mills - One of the best experts on this subject based on the ideXlab platform.

  • Chapter 12 – Conveying Capability
    Pneumatic Conveying Design Guide, 2020
    Co-Authors: David Mills
    Abstract:

    Detailed data on the pneumatic Conveying of a wide range of materials is presented in this chapter to further illustrate the differences in the performance and Capability of materials having a wide range of properties in terms of size, size distribution, and density. In the previous chapter low-velocity dense phase Conveying was illustrated with materials having good air retention properties and in this chapter, this is extended to materials having very good permeability. Various comparative plots of data are also provided to illustrate the potential range of Conveying limits for materials, the influence of airflow rate on Conveying Capability, and the potential range of minimum airflow rates and hence minimum values of Conveying air velocity. As mentioned before, virtually anything can be conveyed pneumatically and the bulk particulate materials included here have a mean particle size range from about 10 micron to 10 millimeters and material bulk densities range from 100 to 2380 kg/m3.

  • Chapter 12 – Conveying Capability
    Pneumatic Conveying Design Guide, 2020
    Co-Authors: David Mills
    Abstract:

    Publisher Summary The Conveying characteristics for different materials vary significantly. This is particularly so for the materials capable of being conveyed in dense phase. At low values of airflow rate, the lines of constant Conveying line pressure drop can have a wide variety of slopes. There is also the added complexity of different materials having different minimum Conveying limits. Thus, for a given air flow rate and Conveying line pressure drop, material flow rates for different materials vary considerably, and the air flow rate necessary to convey different materials can also vary considerably. If only low-pressure air is available for Conveying a material through a pipeline, such as that from a positive displacement blower or a vacuum system, and below about I bar gauge, a material will only be conveyed in dilute phase through a pipeline, unless the Conveying distance is very short. This chapter presents Conveying data for four different materials.

  • Chapter 11 – Conveying Characteristics
    Pneumatic Conveying Design Guide, 2020
    Co-Authors: David Mills
    Abstract:

    In this chapter bulk particulate materials are added to the air in the pipeline and the influence on the resulting Conveying-line pressure drop is illustrated. Conveying air velocities and solids loading ratios are evaluated and the Conveying limits are established for the different types of conveyed material. Data are presented on a number of powdered and granular materials and it is shown how the properties of the materials influence their Conveying Capability. The analysis is then extended to show how different Conveying conditions can influence the power requirements for Conveying materials. This is further developed to evaluate specific energy data so that the economics of pneumatic Conveying can be compared with alternative mechanical means of Conveying. Individual elements of the pipeline are also examined to show how vertically up and vertically down sections of pipeline, as well as bends, compare with horizontal pipeline in the overall performance of a pneumatic Conveying system.

  • Case studies Part II: Coarse material
    Pneumatic Conveying Design Guide, 2020
    Co-Authors: David Mills
    Abstract:

    This chapter discusses a case study where a material has been chosen that has no natural dense phase Conveying Capability and so can only be conveyed in dilute phase suspension flow in a conventional pneumatic Conveying system. The magnesium sulphate had a mean particle size of about 225 μm and so de-aerated very rapidly. The bulk density of the material was about l 010 kg/m 3 and the particle density 2350 kg/m 3 . As with dense phase Conveying, the minimum Conveying air velocity for a material is a critical design parameter; however, unlike dense phase Conveying, there is no significant change in its value with solids loading ratio. To illustrate the scaling process for system design with regard to dilute phase Conveying, the magnesium sulphate is used. It is suggested that a design should be considered for the Conveying of the magnesium sulphate over a horizontal distance of 300m at a rate of 15 tonne/h and that a positive displacement blower having a I bar gauge delivery pressure Capability should be used.

  • The use of high pressure blow tanks for the pneumatic Conveying of pelletised materials
    Handbook of Powder Technology, 2020
    Co-Authors: David Mills
    Abstract:

    Blow tanks are widely used in industry as a material feeding device in pneumatic Conveying systems. Because of their flexibility in operation they are also widely used to obtain Conveying data for system design purposes. This is because a single unit is capable of feeding a very wide range of materials. They have a very high pressure Capability and are capable of operation over a large turn-down ratio. In this chapter, the issue of their control is addressed, particularly with regard to the Conveying of pelletized materials. Blow tank control characteristics are also presented, to illustrate both the means by which control is obtained, and the degree of stability achieved in Conveying. A comparison with granular and fine materials is also included. Pelletized materials generally have a very distinct pressure minimum point in their operating characteristics and this feature is clearly illustrated. For comparative purposes, similar material Conveying characteristics, and blow tank control characteristics, obtained for materials having good air retention, and for materials having neither good air retention nor good permeability, are also included, to illustrate the similarities and differences in material Conveying Capability, and the potential control of blow tanks used as Conveying pipeline feeding devices for these materials.

Xu Yu-wei - One of the best experts on this subject based on the ideXlab platform.

Mark Jones - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of Low Velocity Dense Phase Pneumatic Conveying System to Extend System Conveying Capability
    Advanced Materials Research, 2011
    Co-Authors: Bin Chen, Kenneth C. Williams, Mark Jones
    Abstract:

    This paper reports the current development of technologies to analyse the Conveying performance of bypass low velocity dense phase pneumatic Conveying system for transporting powder bulk materials and slug flow low velocity dense phase pneumatic Conveying system for transporting granular sized bulk materials. It reveals that the bypass system can be operated at a lowered air velocity than conventional pipe line and slug flow system can be also controlled to operate at a lower velocity zone. Hence these technologies have the potential to extend the Conveying Capability of a pneumatic Conveying system to a broader range of materials, also provide better performance in reduction in pipe wear and product degradation.

Bin Chen - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of Low Velocity Dense Phase Pneumatic Conveying System to Extend System Conveying Capability
    Advanced Materials Research, 2011
    Co-Authors: Bin Chen, Kenneth C. Williams, Mark Jones
    Abstract:

    This paper reports the current development of technologies to analyse the Conveying performance of bypass low velocity dense phase pneumatic Conveying system for transporting powder bulk materials and slug flow low velocity dense phase pneumatic Conveying system for transporting granular sized bulk materials. It reveals that the bypass system can be operated at a lowered air velocity than conventional pipe line and slug flow system can be also controlled to operate at a lower velocity zone. Hence these technologies have the potential to extend the Conveying Capability of a pneumatic Conveying system to a broader range of materials, also provide better performance in reduction in pipe wear and product degradation.

Xu Dong - One of the best experts on this subject based on the ideXlab platform.

  • Design and Transform of TPS310 Type Conveying Screw
    Packaging and Food Machinery, 2020
    Co-Authors: Xu Dong
    Abstract:

    Conveying Screw is widely used in carrying food ,is an important part of food machinery. Because of advanced design idea and good Conveying Capability ,Conveying Screw has an important effect on many parts of internal economic .It was used in chemical industry and has gain favorable social benefit and economical benefit .Due to the specialty of its Conveying medium, we make some necessary transform during the designing of Conveying screw.The article shows the design course of chemical industry used Conveying screw in chemical transform, the way to transform the lack, and also provide the reference of this side of design with the experience from the actural production.