The materials (ores) are scattered in the crushing and screening, material transfer, mine feed and discharge, drying workshop, etc., where any excess pressure is generated. If no effective ventilation and dust removal measures are taken, let it be free. Diffusion will seriously pollute the working environment and the atmosphere, and it will cause great harm to the human body. The solution often adopts comprehensive dust-proof measures, which requires the responsibility of the dust-removal system equipment and equipment installation, production and use, and maintenance management.
First, the main measures of ventilation and dust removal
(1) The material is humidified. Generally, the nozzle is humidified, and the sprayer is installed at a place where excessive pressure is generated. For example, the crusher is above the mine mouth, the crusher discharge port (generally placed on the discharge tape), and the sieve of the vibrating screen.
(2) Covering the dust-producing points with a closed cover and confining the dust to a certain space is a prerequisite for ensuring good results of exhaust and dust removal. The fan is used to extract a certain amount of air from the airtight cover, and a certain negative pressure is formed in the cover to prevent the dust from escaping outside the cover. It should be noted that the inclination angle of the dust removal duct is not less than 60°, the wind speed of the vertical pipe and the inclined pipe is 8~15m/s, and the wind speed of the horizontal pipe will be more than doubled, maintaining 18~25m/s.
(3) The extracted dust-containing gas needs to be dedusted and purified, so that it meets the discharge standard and then discharged into the outdoor atmosphere. Dust removal and purification equipment: cyclone dust collector, can be used for the first stage of dust removal, because the efficiency is not too high (60%~80%) is rarely used alone; filter bag dust collector, high dust collection efficiency (95%~99%) It can collect dust 10 -4 mm, commonly used pulse bag type dust collector, its pulse valve needs compressed air pressure; wet type purification equipment, this type of equipment has spray dust collector, water film dust collector, bath type dust collector, text The pipe dust collector and the like have high purification efficiency and simple structure. Regardless of the dry or wet scrubbers, the dust or mud trapped in the underflow should be a good choice of valves or other forms of exhaust components to ensure unobstructed underflow. The dust or mud discharged from the underflow should be properly treated and recycled to ensure the normal operation of the dust removal system.
Second, the dust removal system
The dust removal system is composed of a dust collecting device exhaust hood, an exhaust duct, a dust collector, a ventilator, an exhaust pipe (including a chimney), a pipe accessory, a dust exhausting device, and a maintenance detecting facility; the dust emitted from the dust generating device is exhausted. The cover and the pipeline enter the dust collector for purification, and the dust is discharged through the dust exhaust device, and the purified gas is discharged to the atmosphere through the exhaust pipe (or chimney). This movement of the dust-laden gas is the function of a ventilator, which is also known as a mechanical dust removal system. Dust removal systems can be divided into three types: local, decentralized and centralized:
(1) The local dust removal system is to set the dust collector directly at the dust-producing equipment to capture and recover the dust on the spot, but the application surface is narrow due to the limitation of the operation site.
(2) Decentralized dust removal system combines one or several dust extraction points into a system. The dust collector and ventilator are installed near the dust-producing equipment. The advantages are short pipeline, simple layout and easy air balance. Dust recycling is more troublesome. More applications.
(3) The centralized dust removal system concentrates the exhaust of the dust-producing points of the whole workshop building into one dust-removing system, and can set up a special dust-removing room, which is guarded by a special person. The advantage of dust recovery is easy to mechanize, but the pipe network is more complicated, the resistance is not easy to reach balance, the operation adjustment is difficult, and the pipeline is easy to wear and block.
Third, the main plant ventilation
It is best to have a skylight in the grinding and sorting interval to eliminate the residual heat of the ball mill motor and the odor of the production operation; the drug delivery room is permanently located in a separate operation room, and the overall ventilation facility should be provided to control the harmful gases emitted by the agent; The high-voltage switch room, electrical control room, transformer and low-voltage power distribution room, instrument room and computer room in the grinding plant should be designed according to the process requirements to ensure the number of ventilation and ventilation.
First, the main measures of ventilation and dust removal
(1) The material is humidified. Generally, the nozzle is humidified, and the sprayer is installed at a place where excessive pressure is generated. For example, the crusher is above the mine mouth, the crusher discharge port (generally placed on the discharge tape), and the sieve of the vibrating screen.
(2) Covering the dust-producing points with a closed cover and confining the dust to a certain space is a prerequisite for ensuring good results of exhaust and dust removal. The fan is used to extract a certain amount of air from the airtight cover, and a certain negative pressure is formed in the cover to prevent the dust from escaping outside the cover. It should be noted that the inclination angle of the dust removal duct is not less than 60°, the wind speed of the vertical pipe and the inclined pipe is 8~15m/s, and the wind speed of the horizontal pipe will be more than doubled, maintaining 18~25m/s.
(3) The extracted dust-containing gas needs to be dedusted and purified, so that it meets the discharge standard and then discharged into the outdoor atmosphere. Dust removal and purification equipment: cyclone dust collector, can be used for the first stage of dust removal, because the efficiency is not too high (60%~80%) is rarely used alone; filter bag dust collector, high dust collection efficiency (95%~99%) It can collect dust 10 -4 mm, commonly used pulse bag type dust collector, its pulse valve needs compressed air pressure; wet type purification equipment, this type of equipment has spray dust collector, water film dust collector, bath type dust collector, text The pipe dust collector and the like have high purification efficiency and simple structure. Regardless of the dry or wet scrubbers, the dust or mud trapped in the underflow should be a good choice of valves or other forms of exhaust components to ensure unobstructed underflow. The dust or mud discharged from the underflow should be properly treated and recycled to ensure the normal operation of the dust removal system.
Second, the dust removal system
The dust removal system is composed of a dust collecting device exhaust hood, an exhaust duct, a dust collector, a ventilator, an exhaust pipe (including a chimney), a pipe accessory, a dust exhausting device, and a maintenance detecting facility; the dust emitted from the dust generating device is exhausted. The cover and the pipeline enter the dust collector for purification, and the dust is discharged through the dust exhaust device, and the purified gas is discharged to the atmosphere through the exhaust pipe (or chimney). This movement of the dust-laden gas is the function of a ventilator, which is also known as a mechanical dust removal system. Dust removal systems can be divided into three types: local, decentralized and centralized:
(1) The local dust removal system is to set the dust collector directly at the dust-producing equipment to capture and recover the dust on the spot, but the application surface is narrow due to the limitation of the operation site.
(2) Decentralized dust removal system combines one or several dust extraction points into a system. The dust collector and ventilator are installed near the dust-producing equipment. The advantages are short pipeline, simple layout and easy air balance. Dust recycling is more troublesome. More applications.
(3) The centralized dust removal system concentrates the exhaust of the dust-producing points of the whole workshop building into one dust-removing system, and can set up a special dust-removing room, which is guarded by a special person. The advantage of dust recovery is easy to mechanize, but the pipe network is more complicated, the resistance is not easy to reach balance, the operation adjustment is difficult, and the pipeline is easy to wear and block.
Third, the main plant ventilation
It is best to have a skylight in the grinding and sorting interval to eliminate the residual heat of the ball mill motor and the odor of the production operation; the drug delivery room is permanently located in a separate operation room, and the overall ventilation facility should be provided to control the harmful gases emitted by the agent; The high-voltage switch room, electrical control room, transformer and low-voltage power distribution room, instrument room and computer room in the grinding plant should be designed according to the process requirements to ensure the number of ventilation and ventilation.
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