The Sequel of the successful Congress about industrial Explosion Protection takes place at Nürnberg Convention Center (Exhibition Ground) on April 24 and 25, 2013 in parallel to the renowned POWTECH 2013 Show.
, the German based Association of Experts for Explosion Safety, organizes this two day Event. The so-called IND EX®
Safety Congress (ISC) comprises both, scientific papers with the latest input on breakthroughs in R&D work and new developments in technical solutions and products. Additionally, Live Demonstrations and Special Slots complete the course of the Event and make it a really informative and thrilling Happening.
Not to forget: The high quality of Speakers as well as the wide range of Delegates from different Countries and all kinds of Industries lead to a perfect platform for Networking and Exchange of Ideas and Experiences.
Fatal consequences of insufficient Safety Concepts – Burn and Explosion Traumas to the human body
Prof. Dr. Dr. med. habil. B. Reichert (Head, Department of Plastic, Hand and Reconstructive Surgery, Burn Unit, Nuremberg Clinics, Germany)
Modelling of dust explosions to determine optimum Explosion Protection when the EN Standards and Codes are not relevant or considered too conservative
PGDip Eng David William Price (Managing Director & Senior Explosion Consultant of GEXCON Ltd., United Kingdom)
Mr. Price talks about the following:
A significant number of power generation projects adopting co-firing with Biomass are on the increase with schemes often requiring very large storage areas, often with silo’s | storage capacities in excess of 10,000 m³ and in some cases exceeding 100,000 m³. International standards for explosion relief design (NFPA, EN, VDI) have largely been developed for conventional bulk material handling silo volumes of less than 10,000 m³ with empirical calculations being used to determine the suitable vent areas in m² required to achieve explosion protection in the event of an internal incipient explosion.
Such methods are often not suitable for these massive bulk Biomass stores and if used would impose excessive very conservative explosion protection requirements with significant economic penalties. Using a probabilistic approach analysis of potential dust cloud dispersion within the storage volume assisted by modelling using validated dust explosion CFD codes provides a more realistic design approach to establish a suitable basis of safety using significantly less explosion relief area whilst still demonstrating ALARP. The paper demonstrates how validated CFD can be an effective tool to assist value engineering for an example study in which vent relief design calculations are performed both empirically and using the proposed probabilistic approach assisted with CFD modelling to protect a silo in excess of 100,000m³ for a typical Biomass dust explosion risk. Other examples of where CFD for modelling dust explosions to develop a realistic protection concept that demonstrates ALARP are also presented.
CFD simulations of the 20 L explosion vessel
Prof. Almerinda Di Benedetto (Università degli Studi di Napoli Federico II, Napoli, Italy)
Valeria Di Sarli & Roberto Sanchirico (Istituto di Ricerche sulla Combustione, CNR, Napoli, Italy)
Paola Russo (Università di Roma “La Sapienza”, Roma, Italy)
Prevention and mitigation measures are based on the knowledge of flammability (Minimum Ignition Energy, MIE; Minimum Ignition Temperature, MIT; Minimum Explosible Concentration, MEC; Limiting Oxygen Concentration, LOC) and explosion (Maximum Explosion Pressure, PMAX; Deflagration Index, KSt) parameters for dust/air and/or dust-gas/air mixtures. Experimental measurements of PMAX, KSt and MEC are performed in spherical vessels (20 L sphere and/or 1 m³ sphere, (ASTM E 1226 protocol, ASTM, 2003). A well-established procedure is followed that is based on injecting the dust in the vessel, initially pre-evacuated at 0.4 bar, through a valve connecting a container loaded with dust and pressurized with 21.0 bar of compressed air. At the bottom side of the sphere, a rebound nozzle is placed to allow dispersion of the dust/air mixture inside the vessel. In order to ensure accuracy in measurement, pre-ignition turbulence and uniform dust concentration should be guaranteed. Valeria Di Sarli, Paola Russo, Roberto Sanchirico and Almerinda Di Benedetto have developed a three-dimensional CFD model to describe the turbulent flow field induced by dust feeding and dispersion within the 20 L explosion vessel and the associated effects on the distribution of dust concentration. The developed CFD model was validated against measurements of time histories of pressure and root mean square velocity available in the literature (such as Pu YK, Jarosinski J, Johnson VG, Kauffman CW. The Combustion Institute. 1990: 843-849; van der Wel PGJ, van Veen JPW, Lemkowitz SM, Scarlett B, van Wingerden, CJM., Powder Technology. 1992; 71: 207-215; Dahoe AE, Cant RS, Scarlett B. Flow, Turbulence and Combustion. 2001; 67: 159-184; Hauert F, Vogl A, Radandt S.; In Proceedings of the 6th International Colloquium on Dust Explosions, Shenyang, PRC. 1994.). Simulation results show the presence of multiple turbulent vortex structures which generate dead volumes for the dust. The dust concentration has been also evaluated at different dust nominal concentration and size.
Are we sure that certified safety systems are really safe?
Prof. Dr. Christophe Proust & Emmanuel Leprette (Explosion Protection Experts at INERIS, France)
CEN bodies produced a significant number of standards explaining how safety devices should be tested so as to be EN certified. However, if the real applications are considered from the physical point of view, it appears sometimes that the prescription of the tests are far from the real situation or that the experimental conditions would not permit to tackle the most dangerous situation. A discussion is proposed and a vision is proposed to try and surpass these limitations.
Of using a belt as well as additional suspenders: Explosion Safety repeated unnecessarilyDr.-Ing. Johannes Lottermann (REMBE® GMBH, Germany)
Dr. Johannes Lottermann is Senior Consultant Explosion Protection in a leading position at REMBE®. Based in Germany most of the time you won´t find him there as he serves his customers in large scale projects all around the globe. He is member of several technical committees such as the VDI, VDSI and governmental expert groups. REMBE® is founding member of IND EX®.
How do you protect an explosion prone dust collector? Based on the zoning you´ll choose the appropriate (electrical and mechanical) equipment of each category and mount it. With regard to your ignition hazard analysis you will then put explosion vents or suppression on the dust collector as external ignition sources from upstream units might not be safely prevented. With all respect: Isn´t it over-engineering to apply both: Fully comprehensive prevention on an already protected filter as the cause for an explosion is highly likely the external spark or hot particle and not a non-explosion-proof rotary valve or level sensor? The lecture of Dr. Lottermann will lead through this controversial discussion and enable you to really understand the ATEX-requirements – your benefit will be cost savings in your daily business acting still absolutely in compliance with the explosion safety related rulebooks.
Dr. Ute Hesener (Expert for Explosion Protection at DEKRA EXAM GmbH, Germany)
Dipl.-Ing. Richard Siwek (Managing Director of FIREEX Consultant GmbH, Switzerland)
Dipl.-Ing. Jens Hötger (Expert for Fire and Explosion Protection at DMT GmbH & Co. KG, Germany)
Prof. Dr. Gerd Mühlenbeck (Managing Partner of RECYCON GmbH, Germany)
Dipl.-Ing. ETH Daniel Zellweger (Managing Director of RICO Sicherheitstechnik AG, Switzerland)
Vincent Grosskopf (Expert for Explosion Protection at THORWESTEN VENT GmbH, Germany)
Prof. Dr. Vladimir Molkov (Expert for Hydrogen Explosions at University of Ulster, United Kingdom)
Ph.D. Michael Försth (Senior research scientist in Fire Technology at SP Technical Research Institute of Sweden)
Dipl.-Ing. FH Ulrich Stolz (Head of Technical Department, Authorized Officer of KELLER Lufttechnik GmbH & Co. KG, Germany)
Topics include news like findings from research, updates in legislation, recently developed products and safety measures and brand new lessons learnt.
Congress documentation | softdrinks + snacks + lunch | social evening programme on wednesday | certificate of participation | + free ticket for the POWTECH