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Author: Emmanuel Kwasi Addai
Publisher: Western Engineering, Inc.
ISBN: 0991378229
Category : Science
Languages : en
Pages : 265
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Book Description
Explosion hazards involving mixtures of different states of aggregation continue to occur in facilities where dusts, gases or solvents are handled or processed. In order to prevent or mitigate the risk associated with these mixtures, more knowledge of the explosion behavior of hybrid mixtures is required. The aim of this study is to undertake an extensive investigation on the explosion phenomenon of hybrid mixtures to obtain insight into the driving mechanisms and the explosion features affecting the course of hybrid mixture explosions. This was accomplished by performing an extensive experimental and theoretical investigation on the various explosion parameters such as: minimum ignition temperature, minimum ignition energy, limiting oxygen concentration, lower explosion limits and explosion severity. Mixtures of twenty combustible dusts ranging from food substances, metals, plastics, natural products, fuels and artificial materials; three gases; and six solvents were used to carry out this study. Three different standard equipments: the 20-liter sphere (for testing lower explosion limits, limiting oxygen concentration and explosion severity), the modified Hartmann apparatus (for testing minimum ignition energy) and the modified Godbert–Greenwald (GG) furnace (for testing minimum ignition temperature) were used. The test protocols were in accordance with the European standard procedures for dust testing for each parameter. However, modifications were made on each equipment in order to test the explosion properties of gases, solvents, and hybrid mixtures. The experimental results demonstrated a significant decrease of the minimum ignition temperature, minimum ignition energy and limiting oxygen concentration of gas or solvent and increase in the likelihood of explosion when a small amount of dust, which was either below the minimum explosion concentration or not ignitable by itself, was mixed with gas or solvent and vice versa. For example, methane with minimum ignition temperature of 600 °C decreased to 530 °C when 30 g/m3 of toner dust, which is 50 % below its minimum explosible concentration was, added. A similar explosion behavior was observed for minimum ignition energy and limiting oxygen concentration. Furthermore, it was generally observed that the addition of a non-explosible concentration of flammable gas or spray to a dust-air mixture increases the maximum explosion pressure to some extent and significantly increases the maximum rate of pressure rise of the dust mixture, even though the added concentrations of gases or vapor are below its lower explosion limit. Finally, it could be said that, one cannot rely on the explosion properties of a single substance to ensure full protection of an equipment or a process if substances with different states of aggregate are present.
Author: Emmanuel Kwasi Addai
Publisher: Western Engineering, Inc.
ISBN: 0991378229
Category : Science
Languages : en
Pages : 265
Get Book Here
Book Description
Explosion hazards involving mixtures of different states of aggregation continue to occur in facilities where dusts, gases or solvents are handled or processed. In order to prevent or mitigate the risk associated with these mixtures, more knowledge of the explosion behavior of hybrid mixtures is required. The aim of this study is to undertake an extensive investigation on the explosion phenomenon of hybrid mixtures to obtain insight into the driving mechanisms and the explosion features affecting the course of hybrid mixture explosions. This was accomplished by performing an extensive experimental and theoretical investigation on the various explosion parameters such as: minimum ignition temperature, minimum ignition energy, limiting oxygen concentration, lower explosion limits and explosion severity. Mixtures of twenty combustible dusts ranging from food substances, metals, plastics, natural products, fuels and artificial materials; three gases; and six solvents were used to carry out this study. Three different standard equipments: the 20-liter sphere (for testing lower explosion limits, limiting oxygen concentration and explosion severity), the modified Hartmann apparatus (for testing minimum ignition energy) and the modified Godbert–Greenwald (GG) furnace (for testing minimum ignition temperature) were used. The test protocols were in accordance with the European standard procedures for dust testing for each parameter. However, modifications were made on each equipment in order to test the explosion properties of gases, solvents, and hybrid mixtures. The experimental results demonstrated a significant decrease of the minimum ignition temperature, minimum ignition energy and limiting oxygen concentration of gas or solvent and increase in the likelihood of explosion when a small amount of dust, which was either below the minimum explosion concentration or not ignitable by itself, was mixed with gas or solvent and vice versa. For example, methane with minimum ignition temperature of 600 °C decreased to 530 °C when 30 g/m3 of toner dust, which is 50 % below its minimum explosible concentration was, added. A similar explosion behavior was observed for minimum ignition energy and limiting oxygen concentration. Furthermore, it was generally observed that the addition of a non-explosible concentration of flammable gas or spray to a dust-air mixture increases the maximum explosion pressure to some extent and significantly increases the maximum rate of pressure rise of the dust mixture, even though the added concentrations of gases or vapor are below its lower explosion limit. Finally, it could be said that, one cannot rely on the explosion properties of a single substance to ensure full protection of an equipment or a process if substances with different states of aggregate are present.
Author: Mohammad Reza Rahimpour
Publisher: Elsevier
ISBN: 0323951554
Category : Technology & Engineering
Languages : en
Pages : 494
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Book Description
Crises in Oil, Gas and Petrochemical Industries: Disasters and Environmental Challenges provides an overview of both natural and manmade disasters occurring in oil, gas and petrochemical industries while also covering special solutions based on their types. This volume includes the effects of natural disasters such as earthquakes, floods and hurricanes as well as manmade incidents including fire events, explosions and the release of dust and toxic substances on various related units and plants. In addition, the long-term side effects on both humans and the environment resulted from these industries are presented. Problems such as releasing wastes and venting gases into the environment and challenges from overusing the natural resources and producing noise pollutants are also discussed in detail. Introduces the effects of natural disasters on the oil, gas and petrochemical industries Describes the effect of manmade disasters on oil, gas and petrochemical industries Discusses the long-term side effects of oil, gas and petrochemical units on humans and the environments
Author: Rehak, David
Publisher: IGI Global
ISBN: 1799830608
Category : Computers
Languages : en
Pages : 499
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Book Description
In the modern age of urbanization, the mass population is becoming progressively reliant on technical infrastructures. These industrial buildings provide integral services to the general public including the delivery of energy, information and communication technologies, and maintenance of transport networks. The safety and security of these structures is crucial as new threats are continually emerging. Safety and Security Issues in Technical Infrastructures is a pivotal reference source that provides vital research on the modernization of occupational security and safety practices within information technology-driven buildings. While highlighting topics such as explosion process safety, nanotechnology, and infrastructural risk analysis, this publication explores current risks and uncertainties and the raising of comprehensive awareness for experts in this field. This book is ideally designed for security managers, safety personnel, civil engineers, architects, researchers, construction professionals, strategists, educators, material scientists, property owners, and students.
Author: Alonzo Plumsted Kratz
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 112
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Book Description
Author: W. Wiemann
Publisher:
ISBN:
Category : Dust
Languages : en
Pages : 12
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Book Description
The explosion characteristics of dusts change with the initial temperature. The maximum explosion pressure, the lower explosion limit, and the oxygen limit concentration decrease as the initial temperature rises. The normalized pressure rise rate (KSt value) does not show as clearly the influence of initial temperature. The explosion characteristics of dusts also change with the initial pressure. As the initial pressure is increased, there is a proportional increase of the maximum explosion pressure, the KSt value, and the lower explosion limit. The initial pressure rise also leads to a small decrease of the oxygen limit concentration.
Author: J. B. Gayle
Publisher:
ISBN:
Category : Explosions
Languages : en
Pages : 60
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Book Description
Author: A. D. Levine
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages :
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Book Description
Author: Sergei S. Sazhin
Publisher: Springer Nature
ISBN: 3030997464
Category : Technology & Engineering
Languages : en
Pages : 603
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Book Description
This book acts as a guide to simple models that describe some of the complex fluid dynamics, heat/mass transfer and combustion processes in droplets and sprays. Attention is focused mainly on the use of classical hydrodynamics, and a combination of kinetic and hydrodynamic models, to analyse the heating and evaporation of mono- and multi-component droplets. The models were developed for cases when small and large numbers of components are present in droplets. Some of these models are used for the prediction of time to puffing/micro-explosion of composite water/fuel droplets — processes that are widely used in combustion devices to stimulate disintegration of relatively large droplets into smaller ones. The predictions of numerical codes based on these models are validated against experimental results where possible. In most of the models, droplets are assumed to be spherical; some preliminary results of the generalisation of these models to the case of non-spherical droplets, approximating them as spheroids, are presented.
Author: Stephen Schmotolocha
Publisher:
ISBN:
Category :
Languages : en
Pages : 63
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Book Description
An investigation of some basic flow and combustion characteristics of storable fuels was performed. The work is concerned with the injection, mixing, and chemical reaction processes associated with direct injection of metallized slurries in a high speed air stream. Experiments were performed in a direct connect constant area combustor supplied by a Mach 2 air stream at pressure levels of approximately 1 atm. Penetration and spray formation observations were made at ambient (530R) total temperatures whereas mixing and combustion tests were performed for temperatures ranging from 1500R up to approximately 3500R. The fuels examined in the current study were a magnesium-hexane slurry and a boron-magnesium-hexane slurry. Emphasis was on the Mg/Hex slurry although some revealing preliminary tests were performed for the B/Mg/Hex fuel. The results include the observation that autoignition of the Mg/Hex slurry occurs at about 2600R total temperature and is the same as the pure hexane case; staged ignition and combustion was generally observed with the hydrocarbon igniting first, followed by the metal oxidation process; combustion efficiencies of over 90% were obtained, and the preliminary boron/magnesium/hexane tests indicate that above a certain temperature its performance is superior to the Mg/Hex slurry. (Author).
Author: Russell A. Ogle
Publisher: Butterworth-Heinemann
ISBN: 0128038292
Category : Technology & Engineering
Languages : en
Pages : 687
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Book Description
Dust Explosion Dynamics focuses on the combustion science that governs the behavior of the three primary hazards of combustible dust: dust explosions, flash fires, and smoldering. It explores the use of fundamental principles to evaluate the magnitude of combustible dust hazards in a variety of settings. Models are developed to describe dust combustion phenomena using the principles of thermodynamics, transport phenomena, and chemical kinetics. Simple, tractable models are described first and compared with experimental data, followed by more sophisticated models to help with future challenges. Dr. Ogle introduces the reader to just enough combustion science so that they may read, interpret, and use the scientific literature published on combustible dusts. This introductory text is intended to be a practical guide to the application of combustible dust models, suitable for both students and experienced engineers. It will help you to describe the dynamics of explosions and fires involving dust and evaluate their consequences which in turn will help you prevent damage to property, injury and loss of life from combustible dust accidents. Demonstrates how the fundamental principles of combustion science can be applied to understand the ignition, propagation, and extinction of dust explosions Explores fundamental concepts through model-building and comparisons with empirical data Provides detailed examples to give a thorough insight into the hazards of combustible dust as well as an introduction to relevant scientific literature
