Abstract
Spontaneous combustion is a phenomenon that results from the heating of combustible organic powders by slow oxidation and which occurs through the air passage (created by an air depression) through the mass of dust. The oxidation phenomenon of combustible powders represents their reaction with atmospheric oxygen resulting in products of carbon dioxide, carbon oxide, water and other gases whose content depends on the temperature at which the oxidation takes place. The self-ignition of combustible dusts depends on their chemical composition, the properties of component substances, on the particle size and geometry of the material mass and, last but not least, on the temperature of the environment. Due to global worries of sustainability in construction engineering the trend is to use ecofriendly organic waste to various purposes as in construction materials. The challenge is that by using this kind of materials one should ensure the safety related to the process of such organic materials which are known to have combustible properties. The purpose of this work is to present the self-ignition behavior of combustible dusts such as sunflower and wood by means of drying tests under constant temperature conditions.
Highlights
According to BS 2955: 1958, [68], materials with a particle size of less than 1000 μm are defined as “powders” and particles with a diameter of less than 76 μm are defined as “powders”
NFPA 68 [1] defines dust as any finely divided particle having a diameter of 420 μm or less
When powder particles are at rest on a substrate and touch each other, they are referred to as "powder layers" or "powder deposits"
Summary
According to BS 2955: 1958, [68], materials with a particle size of less than 1000 μm are defined as “powders” and particles with a diameter of less than 76 μm are defined as “powders”. "Dust" is the well-known notion for materials obtained by crushing solids beyond a certain degree of fineness. This notion includes materials commonly known as powder, flour, powder, etc. In this case the air is the dispersing agent, and the powder particles are called the dispersed phase. When powder particles are at rest on a substrate and touch each other, they are referred to as "powder layers" or "powder deposits" In this state the dust can be compared to some extent with a porous body [4]
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