What type of combustion is possible in burning of coal dust?

(d) Burning of coal dust in a coalmine is a spontaneous combustion. The type of combustion in which a material suddenly bursts into flames, without the application of any apparent cause is called spontaneous combustion.

Can coal dust explode?

Fine bituminous coal dust is highly explosive when suspended in air. In a typical coal dust explosion, the dust is scoured by a small methane gas explosion, which also provides the initiating flame. If the initiating explosion is strong enough, even wet coal dust can explode.

Which is an example of spontaneous combustion?

In coal mines, the combustion of coal dust results in fire break outs. This happens several times. Another example of spontaneous combustion includes instantaneous burning of phosphorus or sulphur at room temperature. Thus, the spontaneous combustion of phosphorus in dry air produces phosphorus pentoxide.

Why is coal dust exploding?

The flame and force of a combustible gases explosion are the common basic causes of a coal-dust explosion. The advancing wave of the explosion stirs up the dust on the roadways and thus feeds the flame with the fuel for propagation.

What are the examples of rapid combustion?

Rapid combustion

• The immediate burning of cooking gas in a gas stove to give heat and light.
• The burning of kerosene oil in kerosene stove.
• Burning of wax in a candle.

Does candle form flame?

Structure of a Flame. Light a candle (Caution : Be careful). The substances which vapourise during burning, give flames. For example, kerosene oil and molten wax rise through the wick and are vapourised during burning and form flames.

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.

Is it bad to breathe in coal dust?

Coal workers’ pneumoconiosis (CWP), commonly known as “black lung disease,” occurs when coal dust is inhaled. Over time, continued exposure to the coal dust causes scarring in the lungs, impairing your ability to breathe. Considered an occupational lung disease, it is most common among coal miners.

Is an explosion is an example of spontaneous combustion?

Answer = True. The combustion in which a material suddenly bursts into flames without the application of any apparent cause is called spontaneous combustion.

What is the example of explosion combustion?

Explosive Combustion happens when the reaction occurs very rapidly. The reaction occurs when something ignites to produce heat, light and sound energy, The simple way to describe is it to call it an explosion. Some classic examples are firecrackers or blowing up of dynamite.

Why is there a danger of explosion in places like coal mines?

The danger of a violent explosion is enhanced by dust is not sufficiently inerted by rock dust. In most coal mines, the methane flammable limit and render the s processes within the coal itself may reduce the atmospheric oxygen, thereby further reducing the flammability in the sealed atmosphere.

Is spontaneous combustion still a problem in coal mines?

Spontaneous combustion continues to pose a hazard for U.S. underground coal mines, particularly in western mines where the coal is generally of lower rank. The risk of an explosion ignited by a spontaneous combustion fire is also present in those mines with appreciable levels of accumulated methane. What is the extent of the problem?

What is the process leading to spontaneous combustion?

The process leading to spontaneous combustion can be summarized as follows:  Oxidation occurs when oxygen reacts with coal.  The oxidation process produces heat.  If the heat is dissipated, the temperature of the coal will not increase.  If the heat is not dissipated, then the temperature of the coal will increase.

How long does coal burn for?

These types of coal are frequently extracted from the Powder River Basin in Montana and Wyoming, and have been known to spontaneously combust in railcars and stockpiles. Once a coal fire is started — and particularly if the heat is not sufficiently dissipated — it can continue to burn almost indefinitely.

Why do we grind coal to dust before combusting it?

Grinding coal to dust before combusting it improves the speed and efficiency of burning and makes the coal easier to handle. However, coal dust is hazardous to workers if it is suspended in air outside the controlled environment of grinding and combustion equipment.