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COAL DUST EXPLOSION HAZARDS by CLETE R STEPHAN P E

The ignition temperature of a coal dust cloud decreases as the volatile content increases At high volatile contents the ignition temperature of a coal dust cloud approaches a limiting temperature as low as 440 EC (824 EF) The ignition temperature of a Pittsburgh Seam coal dust cloud is fairly constant as the

Minimum Ignition Energy

Minimum Ignition Energy (MIE) Definition: the minimum energy that can ignite a mixture of a specified flammable material with air or oxygen measured by a standard procedure Depending on the specific application there are several standard procedures for determining MIE

ignition point of coal dust

An analysis of the ignition of coal dust clouds (Journal Article) | OSTI Mar 1 1993 The ignition or explosion of coal dust clouds is of interest in the fields of fire While the authors have observed that the ignition temperature Get Quote Experimental Analysis of Minimum Ignition Temperature of Coal

An Experimental Study of Coal Dust Ignition in Wedge

heat transfer from the hot plate to the coal dust the subsequent chemical heat release and the heat transfer between different regions within the coal dust Furthermore an experimental setup similar to the standard ASTM E 2021 test is used to determine the minimum ignition temperatures of coal

An Experimental Study of Coal Dust Ignition in Wedge

Interestingly the dust around the apex of the wedge which receives the maximum heat flux from the hot plates never ignites Instead tests show that the top layer of coal dust records ignition in the case of 60 wedge and both the top and the middle regions record ignition in the case of 90 wedge

What Causes Spontaneous Combustion?

Causes of Spontaneous Combustion The same is the case with heap of manure and compost also with coal stored in bulk One important point to note is that the more the material heats the faster is the rate of temperature rise Also smoldering and heated material suddenly exposed to air can also start a fire or trigger an explosion

Fuels and Chemicals

are indicated for common fuels and chemicals below: The flammable (explosive) range is the range of a gas or vapor concentration that will burn or explode if an ignition source is introduced Limiting concentrations are commonly called the lower explosive or flammable limit (LEL/LFL) and the upper explosive or flammable limit (UEL/UFL)

The Science of Coal Dust Suppression

coal dust in an underground mine is critical High levels of dust in the atmosphere when mixed with gas can also create an ignition hazard in addition to being a source of premature wear and breakdowns on various pieces of mining equipment There are many different types of dust suppression A bag filter system will use fans to extract air from an area and leave dust in a bag When

HAZARDOUS AREA TECHNICAL GUIDE

(gas vapour dust or fi bre) is present In order to classify this danger an installation is divided into areas of risk depending upon the amount of time the hazardous is present These areas are referred to as Zones Ignition Temperatures for Common Flammable Dusts and Fibers Material Ignition Temperature Cloud Layer Coal Dust 380˚C 225˚C

A Fundamental Study on Coal Dust Cloud Auto Ignition and

The ignition-non ignition temperature data for the coal particles size in the range of 74-125 m is shown in Fig 3 Fig 3 MAIT for Particles Size in The Range of 74-125 m Similar the coal particles size below 74 m the MAIT significantly dropped when increase the coal dust concentration from 40

MINE EXPLOSIONS

1 Fire damp explosions (Where the ignition source is fire damp) 2 Coal-dust Explosions (Where the ignition source is coal dust) 3 Water-gas Explosions (Where the source is red hot coke and water) Firedamp explosions Methane burns in air with a pale blue flame but when it is mixed with air it can explode on ignition

Coal Combustion and Combustion Products

Coal Type Ignition Temperature/ Volatile Initial Release Temperature/ lignite 250–450 130–170 bituminous 400–500 200–300 anthracite 700–800 380–400 Table 2 Coal Ignition Temperature 3 Coal Combustion Technology and Facilities The basic coal combustion technology can be classified on the basis of the particle size

A Fundamental Study on Coal Dust Cloud Auto Ignition and

A Fundamental Study on Coal Dust Cloud Auto Ignition and Methane Flammability Limit in Ventilation Air Methane (VAM) Mohammed J Ajrash Jafar Zanganeh Daniel Eschebach and Behdad Moghtaderi Abstract--The Deflagration and explosion of dust cloud and flammable gases are a major concern in process industry A

Dust explosions explained

Ignition of Dust Clouds The mode of ignition of a dust cloud is typically a hot surface an electrical spark or a mechanically generated frictional spark - see The minimum condition necessary to initiate a dust explosion with certain modes of ignition can be measured and some results are listed below

Fire and Explosion Prevention in Coal Pulverizing Systems

In general for a given system with coal dust dispersed in air throughout its volume (refer to Figure 1 Time = 0) the ignition source ignites adjacent suspended coal dust Energy transfer from the burning coal to the next increment of unburned dust is by ordinary heat transfer and if sufficient will ignite the unburned dust

Metallurgical Coal SDS

Fire and Explosion Hazards: Solid coal is not readily combustible but can be ignited through sustained contact with an open flame Finely-divided coal dust is a moderate fire and explosion hazard particularly when dispersed in the air at high concentrations in an enclosed space and exposed to flame or other ignition sources

Ignition Point

'The metal draws heat from the flame lowering the temperature of the gas below the ignition point ' 'Coal dust an intractable byproduct of the coal-mining process is very combustible with an ignition point of just 160C ' 'The number 451 by the way represents the ignition point

CDC

09/12/2011Prevention of coal mine explosions requires a suite of control strategies including sustaining a properly designed ventilation system adequate sealing of abandoned areas aggressive and frequent monitoring of methane reduction of coal dust accumulations and control of potential ignition sources through electrical safety and the use of permissible equipment

The effects of coal dust concentrations and particle sizes

point sufficient to ignite the coal dust To prevent auto‐ignition from occurring the process temperature must always be kept significantly below the minimum auto‐ignition temperature (MAIT) Additionally the dust cloud properties also restrain and characterise the front flame in the mixture 8 The ventilation air methane (VAM) capture duct is an

Dust explosion protection in a hard coal

gen and an effective source of ignition a further necessary condition of a specific mixture of oxygen and inflammable material must be given in order to reach ignition or explosion Figure 1: The EDV Wybrzeze power plant in Gdansk/Poland Dust explosion protection in a hard coal-fired power plant in Gdansk Application reports

coal ignition temperature

Ignition temperature of coal and other dust is not affected by particle size A big difference is made by the way coal dust comes in contact with a heat source Thus layered powder of coal can ignite at a much lower temperature (160C approx ) whereas a cloud of coal dust will need 450–650C to ignite

Fire and Explosion Hazards in the Handling of Combustible

A wood dust explosion is a propagating (moving) combustion process in which an ignited dust particle ignites nearby particles and the flame proceeds from the ignition source through the premixed dust/air atmosphere The result is heat light combustion gases and pressure

Spontaneous Combustion of Coal

ignition without the application of external heat It is caused by the oxidation of coal If the rate of dissipation of heat is slow with respect to the evolution of heat by oxidation there will be a gradual buildup of heat and temperature will reach the ignition point of coal thereby causing fire or explosion

Minimum Ignition Energy

Minimum Ignition Energy (MIE) Definition: the minimum energy that can ignite a mixture of a specified flammable material with air or oxygen measured by a standard procedure Depending on the specific application there are several standard procedures for determining MIE

The Science of Coal Dust Suppression

coal dust in an underground mine is critical High levels of dust in the atmosphere when mixed with gas can also create an ignition hazard in addition to being a source of premature wear and breakdowns on various pieces of mining equipment There are many different types of dust suppression A bag filter system will use fans to extract air from an area and leave dust in a bag When

LOWER AND UPPER EXPLOSION LIMITS FOR PULVERISED COAL

It can be noticed in Fig 2 that the ignition temperature of coal dust cloud at low concentration takes place at about 600C at average concentration at about 650C At the highest concentration (above 1000 g/m3) the ignition temperature grows to above 700C

Minimum Ignition Energy

Minimum Ignition Energy (MIE) Definition: the minimum energy that can ignite a mixture of a specified flammable material with air or oxygen measured by a standard procedure Depending on the specific application there are several standard procedures for determining MIE

Ignition of Combustible Dust layers on a Hot Surface

Palmer and Tonkin measured the ignition temperature of layers of mixed wood saw dust and coal dust on a hot surface Bowes and Townshend [3]determined experimentally the minimum temperatures for ignition of beech sawdust on a hot surface The results indicated that the depth of the layer is the most important factor affecting the minimum

The effects of coal dust concentrations and particle sizes

point sufficient to ignite the coal dust To prevent auto‐ignition from occurring the process temperature must always be kept significantly below the minimum auto‐ignition temperature (MAIT) Additionally the dust cloud properties also restrain and characterise the front flame in the mixture 8 The ventilation air methane (VAM) capture duct is an

Dust explosions explained

Ignition of Dust Clouds The mode of ignition of a dust cloud is typically a hot surface an electrical spark or a mechanically generated frictional spark - see The minimum condition necessary to initiate a dust explosion with certain modes of ignition can be measured and some results are listed below

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