What are the main hazards of underground coal dust?

1. The hazard of coal dust.

Harm to human health: If a person's lungs inhale a large amount of mineral dust (coal dust) for a long time, they may get silicosis (coal) disease, which is a kind of miner's occupational disease that is currently more harmful.

The hazard of coal dust: under certain conditions, underground coal dust can cause accidents, personnel, damage to equipment and destroy the entire mine, causing serious disasters.

The harm of mine (coal) dust to equipment and instrumentation: it can accelerate the wear and tear of the machine, reduce the service life of the machine and instrument and reduce its detection accuracy.

Mine (coal) dust pollutes the environment and makes the workplace visible.

Reduction, work-related accidents.

increased, the quality of the works decreased.

The basic conditions for coal dust in coal mines are:

Coal dust is the most hazardous; The combustible volatility index of 10% is basically non-hazardous coal dust, and the combustible volatility index of 10% is basically the most hazardous coal dust; The higher the volatile content, the more harmful the coal dust is. Except for a few anthracite coals, the uniformity of the rest of the coal belongs to the best coal dust. The coal dust in Daning Coal Mine is not the most important.

There is a certain concentration of floating coal dust. The lower limit of coal dust** is 30-40gm and the upper limit is 1000-2000

g m, ** at the most powerful concentration range of 300-400

g m when the coal dust concentration is 10

g When the line of sight is obstructed, it is difficult to distinguish the lighting of the miner's lamp1

m beyond fingers, 3-5

g m Feeling uncomfortable breathing.

When the temperature of the ignition source with sufficient energy is 700 -800, the detonation energy is.

The main sources of ignition are cannon flames, electrical equipment sparks, arcs generated by overhead lines and cables, underground fires, gas or combustion and strong mechanical friction.

There is a certain concentration of oxygen. When the oxygen concentration is less than 17%, coal dust is no longer **, and more than 18% can meet the ** requirement under normal circumstances.

Forms of coal dust**: pure coal dust** and gas and coal dust**. In gas.

Under the action of the shock wave, the deposited coal dust flies up, and then ignited by the combustibles ignited after the shockwave, which can cause coal dust, which is secondary, and its destructive power is greater.

It causes extensive fibrosis of the lungs, reduces the compliance and elasticity of the lungs, affects the normal function of the lungs, and seriously causes external respiratory dysfunction and even respiratory failure. Coal dust accumulates in the lungs, and although it will be engulfed by phagocytic cells in the lungs, the phagocytes cannot digest and decompose the coal dust, causing the phagocytic cells to die and release intracellular proteolytic enzymes and some acids to dissolve the surrounding lung tissue. <

Coal dust accumulates in the lungs, although it will be engulfed by the phagocytic cells in the lungs, but the phagocytic cells can not digest and decompose the coal dust, which will cause the phagocytic cells to die and release intracellular proteolytic enzymes and some acids to dissolve the surrounding lung tissue, and the lung tissue will form fibrous tissue to surround these parts in order to prevent the destruction and diffusion of proteolytic enzymes and some acids. Therefore, long-term inhalation of coal dust will cause extensive fibrosis of the lungs, reduce the compliance and elasticity of the lungs, affect the normal function of the lungs, and seriously cause external respiratory dysfunction and even respiratory failure.

The hazards of coal dust are as follows:

1. First of all, coal dust is easy to cause a variety of respiratory diseases, with pneumoconiosis being the most common. Long-term exposure to mineral coal dust causes diffuse fibrosis of lung tissue due to retention in the lungs. The clearance and defense mechanisms of the respiratory system are severely compromised, resulting in structural destruction of lung tissue and impaired lung function.

In addition, the chronic and progressive aggravation of pneumoconiosis weakens the disease resistance of the respiratory tract, and pathogenic microorganisms are easy to invade, and various complications and complications often occur, such as respiratory infection, pneumothorax, tuberculosis, chronic obstructive pulmonary disease, cor pulmonale, and respiratory failure.

2. In addition, long-term exposure to harmful gases and particles will increase the risk of lung tumors. Therefore, it should be kept away from coal dust environment.

3. Coal dust will cause coal dust, and the hazard of coal dust is that the wave generated by coal dust can raise the coal dust deposited in the roadway, which will occur continuously, and even affect the whole mine. When coal dust is **, the explosion temperature can reach 230002500, the flame propagation speed can reach more than 1120m s, and the shock wave speed can reach 2340m s, which is extremely destructive. Coal dust** produces a large amount of carbon monoxide, the concentration of which can reach 2%03%, which can poison people to death.

The main hazards of mineral dust are:

1. Polluting the workplace, endangering human health and causing occupational diseases;

2. Some mineral dust can be used under certain conditions;

3. Accelerate mechanical wear and shorten the service life of precision instruments;

4. Reduce the visibility of the workplace, and increase the occurrence of work lift rot accidents.