Coal dust explosion prevention and isolate the effective mea
Date:2013-11-22 Hits:
Coal dust explosion prevention and isolation requires effective measures, and effective measures taken to prevent the coal dust explosion? To prevent the coal dust explosion measures including dust control measures, explosion-proof measures and flameproof measures.
(a) the dustproof measures
Dustproof measures role is to reduce coal dust and flying.
1 when drilled dust
(1) wet drilling. The essence of wet drilling, with drilling process, continuously move water to the bottom to flush drilling, cuttings and wet rock powder, reduce rock dust and flying objective.
(2) water drilling. Mainly used in mining and tunneling face drilling and hydropower, and also can be used for the soft rock and coal rock drivage face.
(3) the dry dust. Dry dust is mainly used for rock roadway drivage dry, cold area and some special conditions of surface.
When the 2 blasting dust
(1) the water bag packing hole. Commonly known as "water stemming". Its essence is the water filled plastic bag fill in the hole, blasting bag was shattering, and water into the cracks and pulverized coal dust, in order to achieve the purpose of.
(2) water blasting. Water blasting can not only reduce the amount of coal dust, but also reduce the gas emission, increase the blasting safety and improve blasting effect.
Blasting practice is: explosive shot eyes, mouth sealed, and then water to the blastholes, and then blasting. The blasting method can be used in the coal lane tunneling, can also be used for mining.
(3) spray. Spray dust suppression measures a simple blasting. Multi joint action of Feng Shui for sprayer, which uses compressed air as the main driving force, will be lower than the pressure 98kPa ~ 196kPa water jet out, atomize. Its range is big, fine mist granule, jet width, the dust removal effect is good.
(4) the water curtain. Blasting driving face, the water curtain is a kind of effective measures of dust and smoke. At the same time, the water curtain are also located in the coal mining working face return air lane or rich dust source in the tunnel, to dust and purifying air.
3 rock (coal) when the dust
After blasting excavation or working, general is first washed coal, rock side, to clear the dust deposition, and then the heap of coal or rock pile for the sprinkler, at last shipment.
(1) the artificial watering. The general requirement is that the blasting down coal or rock fully wet, not only to the watering before shipment, the shipment is also often watering, so that the dust concentration reduced to 2mg / m3.
(2) sprayer sprinkler.
4 the transportation of dust
The main measures are sprayer.
Dust 5 mining machine cutting coal.
(1) to select the best cutting speed. The very large effects of cutting parameters on the dust quantity of mining machinery. Generally taken to reduce the number of teeth, tooth pitch, increase increase cutting depth and reduce the cutting speed and other measures.
(2) sprayer. Sprayer is a dust reduction measures commonly used when cutting coal mining machinery. Outside sprinkler spray and spray water, also can use at the same time.
(3) removal measures:
Dust the dust collector.
The foam dust removal. The foam dust removal is the use of surfactant foaming agent is mixed with water, through a foaming device and catheter injection to mining machinery coal cutting area, in order to capture dust. Because the foam volume generated large, covering the dust source, to achieve the purpose of preventing flying dust.
The ventilation and dust removal. Ventilation measures reasonable can effectively avoid the dust, it is one of the means of the dust-proof chemical machinery. Tunneling ventilation dust removing effect and ventilation are closely related. Ventilation can be quickly cleaning work space, but the dust laden air through the tunnel. Exhaust ventilation, only when the cylinder air inlet from the working surface is less than 2m, dust removing effect is significant. Therefore, ventilation dust removal effect of mixing the best.
6 pre wetting coal dust
Pre wetting coal is to be wetted in coal mining water has not been before, increase the moisture, resulting in order to reduce the amount of the mining of coal dust. The method has the coal seam water injection and production irrigation empty area.
7 personal protective measures
Because the dust on the respiratory health of great harm in coal miners. Therefore, individual protection should be attention. Individual protective device used with:
(1) self suction anti-dust masks. Self suction anti-dust masks on human lung inspiratory air containing dust and purifying the respirator filter. It had no change valve and valve two.
(2) the air supply anti-dust masks. Blower type anti-dust masks is a miniature fan will dust containing air to the filter purification, purified air is then sent to the mask for breathing tube snake.
(3) compressed air breathing apparatus. Pneumatic respirator as an isolated individual protective equipment. It is the pressure of the compressed air in the wind pipe after filtration, disinfection and after decompression, again through the catheter into the mask for breathing. Its advantages are, from the dust, and breathing. Defect is, place of work need compressed air pipeline, and each with a long tube, action inconvenience.
(two) the explosion-proof measures
To prevent dust generation and prevent dust ignition measure called explosion-proof measures.
1 clean coal dust
Coal dust in the roadway surrounding, support and equipment on the accumulation of regular cleaning. In China coal mines for manual cleaning, watering after cleaning, to prevent the coal dust, coal dust to clean.
2 flushing sediment
Regular water flushing sediment of roadway roof, help and support, wash down the dust to clean up.
3 brush oar
The main roadway and chamber to brush oar. Brush paste materials are lime and water, the volume ratio of 1:1.4, by manual or mechanical spray in the roadway, on top of help. Its effect is easy to observe the dust deposition, tunnel at the same time, can also be covered and consolidation of deposited coal dust, which is no longer flying.
4 cloth rock powder
The rock powder is inert dust, in the surrounding cloth rock powder, can increase the incombustible material deposited in coal dust, can prevent and control coal dust explosion. However, explosion-proof rock powder only reaches a certain proportion in the coal dust, can effectively play. With the increase of coal production and coal dust deposition strength, frequent repeat spraying.
In 5 bond deposited coal dust
Coal dust is bonded to the surrounding spray adhesive solution. Bonded liquid consists mainly of wetting agents and inhaled the salt composition, it can have been deposited and successively deposited coal dust are bonded together, has lost the ability to prevent the explosion of flying, participation.
(three) the flameproof measures
Range limit of coal dust explosion accidents, not to expand the spread measures, called the flameproof measures. Flameproof measures have the following two:
1 the rock powder shed
The rock powder is arranged in the rock powder shed, is arranged on the tunnel. The coal dust explosion, shock wave blowing rock powder shed, caused the rock powder dust, forming a strong rock dust cloud, stopped the explosion flame, in order to prevent the explosion spread to.
Mine in the wings, adjacent mining area and the adjacent seam must be separated with the rock powder shed. The rock powder moisture not easily replaced flying, falling dust should always check and clear.
2 water shed
In recent years the use of the water shed instead of rock powder shed to isolate the coal dust explosion. The water shed is composed of water, similar to the rock powder shed, explosion shock wave makes the water shed flip or broken, the water in the instantaneous spread on the roadway space, forming a mist, to prevent the spread of explosion flame.
------分隔线----------------------------
- Link
-