04.2021 Office Talk
Discussion on dust explosion
Yuanfang industry (Shanghai) / Li Jian
Production must be safe and safe in order to produce. Recently, a number of explosion and combustion accidents occurred in domestic enterprises, which sounded the alarm of safety production for the textile industry. In fact, if enterprises can do a good job in dust removal and explosion-proof measures, dust explosion accidents can be avoided. This article will introduce fire safety knowledge -- how to prevent dust explosion.
Spinning production is a labor-intensive industry. There are many people, many machines and equipment, and there are dust, noise and other adverse problems. In addition, spinning raw materials are flammable, which is easy to cause fire.
Generally speaking, there are five elements in the condition of dust explosion
Certain dust concentration: the unit of stoichiometric concentration used in dust explosion is different from that used in gas explosion. Gas explosion is expressed by volume percentage, while dust concentration is expressed by the quality of dust particles contained in unit volume, and the unit is g / M 3 or mg / L.
Certain oxygen content: This is the basis of dust combustion.
Sufficient ignition sources: the minimum ignition energy of dust explosion is 1-2 orders of magnitude larger than that of gas explosion, and the minimum ignition energy of most dust clouds is 5 MJ-50 MJ.
Dust is in suspension state: that is, dust cloud state, in order to increase the gas contact area and speed up the reaction speed.
Dust cloud in a relatively closed space: in this way, the pressure and temperature can rise sharply, and then explosion occurs.
In order to prevent explosion accidents, spinning mills should pay attention to the following key points:
The front spinning workshop, especially in the cleaning and carding stage, must be equipped with dust removal equipment. According to the national standard, the positive pressure method is not allowed for dust removal.
The combined dust removal equipment that can continuously filter, collect dust, compact and remove dust without sparking shall be adopted, and the settling dust removal is strictly prohibited.
The air dust concentration of spinning workshop should be controlled below 3mg / M 3.
Attention should be paid to the ventilation of the dust removal room, which should not be closed.
The dust removal room should pay attention to the management of cleaning and sanitation, and remove the waste cotton in time to avoid accumulation.
Dust removal equipment must meet the safety standards, equipped with explosion-proof motor and safety pressure relief device; dust removal room must use explosion-proof switch and explosion-proof lighting.
Dust explosion prone equipment is dust collector, dust collector, wind conveyor, trench In addition to increasing the difficulty of construction, it will also cause the unsafe environment of dust deposition.
Regularly check the electrical switch and circuit, and standardize the safe electricity system.
The cleaning process, inside the dust filter pipe and at the entrance of the dust filter shall be equipped with fire detection devices, and special personnel shall be required for maintenance and management.
Fire doors or fire compartments should be set between the areas of front spinning, spinning and post-processing, so it is not safe to put raw materials and cleaning process together.
Be sure to keep the fire passage and evacuation passage, and do not block them.
Fire extinguisher, talcum powder bucket, fire hydrant and other equipment must be kept in good condition and can be used normally.
To carry out welding, gas cutting and other open fire operations, there must be an examination and approval system, and a responsible person and guardian must be set up.
The fire prevention system should be formulated and implemented strictly. There should be a fire prevention plan. If possible, a volunteer fire brigade should be set up and practiced regularly.
Enterprise managers (especially enterprise legal person) must pay attention to fire safety, and all employees should have a strong sense of safety.
Fire prevention is the most important thing for textile enterprises. Only in case of fire, can they develop in a safe and sound environment. We should never regret for taking chances.
Spinning production is a labor-intensive industry. There are many people, many machines and equipment, and there are dust, noise and other adverse problems. In addition, spinning raw materials are flammable, which is easy to cause fire.
Generally speaking, there are five elements in the condition of dust explosion
Certain dust concentration: the unit of stoichiometric concentration used in dust explosion is different from that used in gas explosion. Gas explosion is expressed by volume percentage, while dust concentration is expressed by the quality of dust particles contained in unit volume, and the unit is g / M 3 or mg / L.
Certain oxygen content: This is the basis of dust combustion.
Sufficient ignition sources: the minimum ignition energy of dust explosion is 1-2 orders of magnitude larger than that of gas explosion, and the minimum ignition energy of most dust clouds is 5 MJ-50 MJ.
Dust is in suspension state: that is, dust cloud state, in order to increase the gas contact area and speed up the reaction speed.
Dust cloud in a relatively closed space: in this way, the pressure and temperature can rise sharply, and then explosion occurs.
In order to prevent explosion accidents, spinning mills should pay attention to the following key points:
The front spinning workshop, especially in the cleaning and carding stage, must be equipped with dust removal equipment. According to the national standard, the positive pressure method is not allowed for dust removal.
The combined dust removal equipment that can continuously filter, collect dust, compact and remove dust without sparking shall be adopted, and the settling dust removal is strictly prohibited.
The air dust concentration of spinning workshop should be controlled below 3mg / M 3.
Attention should be paid to the ventilation of the dust removal room, which should not be closed.
The dust removal room should pay attention to the management of cleaning and sanitation, and remove the waste cotton in time to avoid accumulation.
Dust removal equipment must meet the safety standards, equipped with explosion-proof motor and safety pressure relief device; dust removal room must use explosion-proof switch and explosion-proof lighting.
Dust explosion prone equipment is dust collector, dust collector, wind conveyor, trench In addition to increasing the difficulty of construction, it will also cause the unsafe environment of dust deposition.
Regularly check the electrical switch and circuit, and standardize the safe electricity system.
The cleaning process, inside the dust filter pipe and at the entrance of the dust filter shall be equipped with fire detection devices, and special personnel shall be required for maintenance and management.
Fire doors or fire compartments should be set between the areas of front spinning, spinning and post-processing, so it is not safe to put raw materials and cleaning process together.
Be sure to keep the fire passage and evacuation passage, and do not block them.
Fire extinguisher, talcum powder bucket, fire hydrant and other equipment must be kept in good condition and can be used normally.
To carry out welding, gas cutting and other open fire operations, there must be an examination and approval system, and a responsible person and guardian must be set up.
The fire prevention system should be formulated and implemented strictly. There should be a fire prevention plan. If possible, a volunteer fire brigade should be set up and practiced regularly.
Enterprise managers (especially enterprise legal person) must pay attention to fire safety, and all employees should have a strong sense of safety.
Fire prevention is the most important thing for textile enterprises. Only in case of fire, can they develop in a safe and sound environment. We should never regret for taking chances.
