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Alfaraj, H M and Qin, S (2011) Operationalising CMMI: integrating CMMI and CoBIT perspective. Journal of Engineering, Design and Technology, 9(03), 323-35.

Kaur, G, Singh, M L and Patterh, M S (2011) Analytical analysis of long-haul DWDM optical transmission systems in the presence of fiber nonlinearities. Journal of Engineering, Design and Technology, 9(03), 336-46.

Kumar, S, Khan, I A and Gandhi, O P (2011) A kaleidoscopic view of psychology in design for maintainability of mechanical systems: A review. Journal of Engineering, Design and Technology, 9(03), 347-70.

Mamphweli, N S and Meyer, E L (2011) Development of a cyclone with internal electric field. Journal of Engineering, Design and Technology, 9(03), 313-22.

  • Type: Journal Article
  • Keywords: alternative technologies ; new technologies; design; gas technology; high voltage engineering; performance monitoring; process optimization; product design
  • ISBN/ISSN: 1726-0531
  • URL: https://doi.org/10.1108/17260531111179924
  • Abstract:
    Purpose The purpose of this paper is to develop a cyclone with an internal electric field to capture dust and fine carbon particles with less than 5 µm diameter. Design/methodology/approach The cyclone collection efficiency model described by Cooper and Alley was used to design a conventional cyclone, which was later modified by introduction of the solenoid around it to introduce an electric field. The cyclone design performance was later established using ferrosilicon powder with less than 5 µm diameter. Findings The cyclone was found to have a particle collection efficiency of around 25 per cent for ferrosilicon powder before the introduction of the solenoid; the introduction of the solenoid increased the particle collection efficiency to around 50 per cent and the charging of the solenoid further increased the collection efficiency to 85 per cent at 2 kV DC and 97 per cent at 3 kV DC. When the cyclone was placed back on the gasifier system and supplied with 2 kV DC, it collected up to 270 g of fine carbon particles within 150 min of operation. Research limitations/implications The major drawback was that the highest particle collection efficiency for the cyclone could only be achieved at very high voltage (3 kV) but this could not be supplied when the cyclone was back in the gasifier system due to air ionization that results in the corona effect. Practical implications The collection of very fine particles (less than 5 µm diameter) in hot gas streams is always a challenge, particularly in biomass gasifier systems. This resulted in a high cost of gas purification or initial investments in downstream processes. The developed cyclone could cut down this expenditure since most of the particles will not go beyond the cyclone. Originality/value Electrostatics has been applied in the development of gas cleaning devices, however most of these devices tend to be too cumbersome. The developed cyclone is based on the conventional design, which is less complicated and cheap to manufacture.

Mlitwa, N B W and Birch, D (2011) The role of intrusion detection systems in electronic information security: From the activity theory perspective. Journal of Engineering, Design and Technology, 9(03), 296-312.

Othman, A and Abdellatif, M (2011) Partnership for integrating the corporate social responsibility of project stakeholders towards affordable housing development: A South African perspective. Journal of Engineering, Design and Technology, 9(03), 273-95.

Woldemichael, D E and Hashim, F M (2011) A framework for function-based conceptual design support system. Journal of Engineering, Design and Technology, 9(03), 250-72.