- Author
-
Scheid, M.
|
Sand, I. O.
- Title
- Influence of Turbulence and Flow-Rate on Ignition Properties of Combustible Mixtures.
- Coporate
- Christian Michelsen Research, Bergen, Norway
- Report
-
CMR-00-F30075,
April 2000,
66 p.
- Keywords
-
combustibles
|
mixtures
|
turbulence
|
flow rate
|
ignition
|
dust
|
ignition temperature
|
temperature
|
dust explosions
- Identifiers
- Dust Explosion Safety in the Process Industries (DESPRO); minimum ignition temperature and energy of a dust cloud; Minium Ignition Energy (MIE); dust cloud concentration measurement
- Abstract
- In this document a deeper insight into the matter of dust explosions and the properties of its ignition is given. Especially the influence of turbulence and flow velocity on characteristic parameters for ignition such as the Minimum Ignition Temperature (MIT) and the Minimum Ignition Energy (MIE) are investigated. To classify the risk of an explosion by ignition sources such as hot surfaces, mechanical sparks or electrostatic discharges, standard tests for determining the MIT and the MIE have been developed. These properties are determined in the Godbert-Greenwald furnace (MIT) and the Hartman apparatus (MIE). In both pieces of equipment characteristic values for different types of lycopodium and maize starch were determined. The results agreed very well with results found in the literature and only minor differences in the MIE and MIT values between the different types of lycopodium were found. During measurements of the temperature distribution in the Godbert-Greenwald furnace it was found that the temperature distribution only changes slightly with the distance to the hot walls and stays almost constant after the dust cloud enters the furnace.