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Coal dust suspended in air is explosive—coal dust has far more surface area per unit weight than lumps of coal, and is more susceptible to spontaneous combustion. As a result, a nearly empty coal store is a greater explosion risk than a full one.Dusts have a very large surface area compared to their mass. Since burning can only occur at the surface of a solid or liquid, where it can react with oxygen, this causes dusts to be much more flammable than bulk materials.The smaller size of particle, low moisture in coal and high coal dust dispersion can increase the possibility or risk of dust explosion. Also, the shorter time of dust dispersion exposed to ignition source can enhance relatively low the possibility of coal dust explosion.
Why is dust so explosive?
Dusts have a very large surface area compared to their mass. Since burning can only occur at the surface of a solid or liquid, where it can react with oxygen, this causes dusts to be much more flammable than bulk materials.
What factor affects a coal dust explosion happen in mines?
The smaller size of particle, low moisture in coal and high coal dust dispersion can increase the possibility or risk of dust explosion. Also, the shorter time of dust dispersion exposed to ignition source can enhance relatively low the possibility of coal dust explosion.
What is Coal dust Explosion? Know about it |
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Which dust is explosive?
Substances capable of explosion
2.2 Examples of explosible dusts in the food industries include materials such as: flour, custard powder, instant coffee, sugar, dried milk, potato powder and soup powder.
What are the five factors needed to cause a dust explosion?
If the event is confined by an enclosure such as a building, room, vessel or process equipment, the resulting pressure rise may cause an explosion. These five factors (oxygen, heat, fuel, dispersion and confinement) are known as the Dust Explosion Pentagon.
What are the factors that are the basis for an explosion?
In general, an explosive has four basic characteristics: (1) It is a chemical compound or mixture ignited by heat, shock, impact, friction, or a combination of these conditions; (2) Upon ignition, it decom- poses rapidly in a detonation; (3) There is a rapid release of heat and large quantities of high-pressure gases …
Is all dust explosive?
If a concentration of dust is too low, there is not enough of it present to fuel an explosion. If the concentration is too high, there is not enough oxygen to support combustion. While some combustible dusts are easy to guess—wood and paper dust, for example—others aren’t, such as aluminum dust.
What is coal explosion?
A mine explosion caused by the ignition of fine coal dust. It is considered that an explosion involving coal dust alone is relatively rare. It demands the simultaneous formation of a flammable dust cloud and the means of ignition within it.
See some more details on the topic which factor explains why coal dust is explosive here:
Which factor explains why coal dust is explosive? – Quora
coal dust when it’s a fine powder and is floating in the air is explosive due to a few factors. 1. · due to the sudden rate of expansion when igniting coal dust …
Which factor explains why coal dust is explosive? temperature …
The answer to the question stated above is surface area. Coal dusts are fine powdered form of coal, which are formed by crushing, grinding, or pulverizing …
Which Factor Explains Why Coal Dust Is Explosive – Micro B Life
Coal dust suspended in air is explosive—coal dust has far more surface area per unit weight than lumps of coal and is more susceptible to …
Modelling Coal Dust Explosibility of Khyber Pakhtunkhwa …
Therefore, the need for coal dust explosion investigation is a factor for safety in the chemical process industries and its storage for …
Which factor or factors affect the rate of a chemical reaction?
Reactant concentration, the physical state of the reactants, and surface area, temperature, and the presence of a catalyst are the four main factors that affect reaction rate.
What type of combustion is represented by burning of coal dust in coal mine?
(d) burning of coal dust in a coal mine ? (a) Spontaneous combustion.
Why is sugar dust explosive?
The chain reaction produced from the ignited sugar dust particles produces energy. This produces compression and expands the volume of the air. When this buildup occurs faster than the flame burns — as can be the case indoors — you have an explosion.
What do you mean by dust and explosion?
What Does Dust Explosion Mean? A dust explosion results when a certain amount of combustible dust is dispersed through the air in sufficient concentration to cause a violent reaction when ignited by a flame, spark, or other ignition source.
Why does sawdust explode?
Clouds of sawdust are combustible and therefore susceptible to fire, and if the dust is contained within full or partial enclosures in significant volume, a single spark or ignition source can trigger an explosion.
Which of the following are required for a dust explosion to occur?
- The dust must be combustible and release enough heat when it burns to sustain the fire.
- The dust must be capable of being suspended in air.
- The dust must have a particle size capable of spreading the flame.
What are potential conditions that could present a combustible dust explosion hazard?
Oxygen in air (oxidizer). An additional two elements must be present for a combustible dust explosion: 4. Dispersion of dust particles in sufficient quanti- ty and concentration; and, 5. Confinement of the dust cloud.
Coal dust explosion demonstration
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How can dust explosion be prevented?
- Implement a hazardous dust inspection, testing, housekeeping and control program.
- Use proper dust collection systems.
- Regularly inspect for dust residues in open and hidden areas.
Which of the following is explosive?
The correct answer is Nitroglycerin. Nitroglycerine is a liquid chemical substance used for making Dynamite by mixing highly sensitive Nitroglycerine with sawdust & powered Silica. The chemical used in the manufacturing of dynamite is Glycerol trinitrate.
Which of the following is an explosive compound?
Solution : `XeO_(3)` is an explosive compound and explodes violently when dry.
What are the main effects of explosions?
Explosion effects generally include those of overpressure, thermal effects, energized projectiles (fragments, debris, and missiles), ground shock, and cratering.
How much dust does it take to cause an explosion?
The lower explosive limits of many materials have been measured. They vary from 10 grams per cubic metre to about 500 grams per cubic metre. For most practical purposes it may be assumed that 30 grams per cubic metre is the lower explosive limit for most flammable dusts.
What is an explosive hazard?
The OSHA Laboratory Standard defines an explosive as a chemical that causes a sudden, almost instantaneous release of pressure, gas, and heat when subjected to sudden shock, pressure, or high temperature. Under the Department of Transportation (DOT) hazard class system, explosives are listed as hazard class 1.
What is an example of a flammable dust?
Agricultural products such as egg whites, powdered milk, cornstarch, sugar, flour, grain, potato, rice, etc. Metals such as aluminum, bronze, magnesium, zinc, etc. Chemical dusts such as coal, sulphur, etc.
Why is coal dust a fire hazard?
Coal dust suspended in air is explosive—coal dust has far more surface area per unit weight than lumps of coal, and is more susceptible to spontaneous combustion. As a result, a nearly empty coal store is a greater explosion risk than a full one.
How is coal combustible?
Coal is a readily combustible rock consisting more than 70% by volume and 50% by weight of carbonaceous material [20]. The inorganic non-combustible compounds which produce sulphur compounds and ash is the non-carbonaceous matter and mineral matter in coal.
What is explosive in mining?
Explosives being used in mining. Drill and blast mining is a common method used to break up ‘benches’ of rock in order to send the smaller pieces of rock containing ore to the processing plant to further separate the valuable ore from the waste rock.
How much dust does it take to cause an explosion?
The lower explosive limits of many materials have been measured. They vary from 10 grams per cubic metre to about 500 grams per cubic metre. For most practical purposes it may be assumed that 30 grams per cubic metre is the lower explosive limit for most flammable dusts.
Can dust cause a fire?
“Dust can ignite quickly and spread throughout your home if your heaters or electrical sockets cause a spark,” says Dirocco. “I recommend dusting your house at least once a week to prevent house fires caused by dust igniting.” These 10 household items are extremely flammable.
Coal dust explosion explained
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Why does sawdust explode?
Clouds of sawdust are combustible and therefore susceptible to fire, and if the dust is contained within full or partial enclosures in significant volume, a single spark or ignition source can trigger an explosion.
How can we prevent dust explosions?
Use proper dust collection systems. Regularly inspect for dust residues in open and hidden areas. If ignition sources are present, use cleaning methods that do not generate dust clouds. Control smoking, open flames and sparks, including mechanical sparks and friction.
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