Quick Answer: How do you stop coal dust explosions?

Coal dust explosions in underground coal mines are prevented by generous application of rock dust (usually limestone). If an explosion should occur, the rock dust disperses, mixes with the coal dust and prevents flame propagation by acting as a thermal inhibitor or heat sink.

What causes coal dust explosions?

Coal mine explosions are generally caused by either methane or coal dust. … Explosions happen when the methane comes in contact with a heat source. The combustion process causes air inside the mine to expand which can create a shock wave. The most common method to control methane levels in coal mines is ventilation.

Why is there a danger of explosions in coal mines?

There is an increased risk of explosion in enclosed places like coal mines because flammable or combustible materials may become ignited by pressure that have built up inside the mines. Apart from this risk, the mines giving way or collapsing remain possible that could result in several fatalities and injuries.

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Can coal dust make you sick?

1. Exposure to coal mine dust causes various pulmonary diseases, including coal workers’ pneumoconiosis (CWP) and chronic obstructive pulmonary disease (COPD). 2. Coal miners are also exposed to crystalline silica dust, which causes silicosis, COPD, and other diseases.

What is rock dusting in coal mines?

Rock dust (generally pulverized limestone dust) serves as a heat sink material that prevents or suppresses a propagating coal dust explosion through the absorption of thermal energy from the heated gases and absorption of radiant energy, which reduces the preheating of unburned coal particles ahead of the flame front.

Can you burn coal dust?

The dust, can be, laid on a fire, once it has been burning for a while. A little at a time, can keep the fire burning, without having to keep putting lumps on.

Why do coal miners dust walls?

Coal dust explosions in underground coal mines are prevented by generous application of rock dust (usually limestone). If an explosion should occur, the rock dust disperses, mixes with the coal dust and prevents flame propagation by acting as a thermal inhibitor or heat sink.

Why is coal dust more dangerous than coal?

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.

Which gas causes explosion in coal mine?

There are two main types of coalmine explosions: methane and coal dust. Methane explosions occur when a buildup of methane gas contacts a heat source and there is not enough air to dilute the gas level below its explosion point.

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What gas kills miners?

Black Damp – Carbon Dioxide (CO2)

Black damp is the mining term for the suffocating mixture of carbon dioxide and other unbreathable gases that can build-up in mines causing poisoning, asphyxiation, and ultimately death if left untreated.

Can lungs get rid of dust?

Besides macrophages, the lungs have another system for the removal of dust. The lungs can react to the presence of germ-bearing particles by producing certain proteins. These proteins attach to particles to neutralize them. Dusts are tiny solid particles scattered or suspended in the air.

How harmful is coal ash?

Coal ash is incredibly dangerous. Short-term exposure can bring irritation of the nose and throat, dizziness, nausea, vomiting, and shortness of breath. Long-term exposure can lead to liver damage, kidney damage, cardiac arrhythmia, and a variety of cancers.

Can you get sick from breathing in dust?

You may not think it’s a big deal when you breathe in dust, but for some people, it could bring on a lung disease called hypersensitivity pneumonitis. It’s an allergic reaction to particles in the dust, and it can cause symptoms like coughing and shortness of breath.

How does removing the overburden during coal extraction affect the environment?

Strip mining eliminates existing vegetation and alters the soil profile, or the natural soil layers. Mining disturbs and may even destroy the beneficial micro-organisms in the topsoil. Soil also may be damaged if reclamation operations mix the topsoil with subsoils, diluting matter in the surface soil.

What are slurry ponds?

Any natural or artificial pond or lagoon for settling and draining the solids from washery slurry.

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Coal mine