1. The fans in the tunnel are high-power industrial fans. Is it used to make the air in the tunnel flow and exhaust the automobile exhaust? , enter the fresh air, so that the automobile exhaust in the tunnel is diluted and the harm is reduced.
2. If there is a fire in the tunnel, these fans can be turned on in the opposite direction according to the location of the fire point, so as to reduce the air circulation, gradually increase the firepower and give everyone enough time to evacuate.
3. The tunnel ventilator is mainly used to discharge the harmful gas generated by the explosion of explosives, the use of internal combustion engine and the release of harmful gas in the stratum during excavation, which is an important condition for providing a good construction environment for tunnel construction, maintaining the health of operators, ensuring the normal and smooth construction, improving work efficiency and ensuring the engineering quality.
Extended data:
1, selection criteria of tunnel ventilator:
The selection of ventilation equipment is the key to determine the ventilation effect in the tunnel, and the maximum ventilation volume required in the tunnel is the control factor for the selection of ventilation equipment, while the working total wind pressure and working air volume of the ventilator are two more important factors for the selection of the ventilator.
2. Configuration standard:
The factors such as air volume, wind speed, durability and cost of tunnel ventilation pipe should be fully considered in the selection of tunnel ventilator ventilation pipe. The ventilation pipe is generally made of plastic, and the diameter of the ventilation pipe is 1 10cm, with a section of 20m. The joint adopts a new rigid joint, and the ventilation pipe is installed in the center or slightly off the center of the tunnel roof. Drill a aiming rod hole every 5m, the deflection of hanging air duct shall not exceed 150mm every 100 m, and the axial deviation shall not exceed 300mm every 100m. ..
Because it takes a long time to purify the air in the middle of the roadway, the air purification degree is difficult to meet the requirements of the working face, so mixed ventilation is adopted, a ventilator is installed at the entrance of the roadway, and forced air supply is adopted.
3. Use scenario:
(1) Tunnel ventilator is specially designed for ventilation of vertical (inclined) shafts in extra-long tunnels. Widely used in centralized ventilation, centralized ventilation, mixed ventilation and ventilation, and also suitable for semi-horizontal, full-horizontal and tunnel auxiliary ventilation. According to the specific performance parameters of the design, different impeller diameters or the same impeller diameter can be used to adjust the blade installation angle to meet the requirements of air supply and exhaust with different air volume and wind pressure.
(2) During the tunnel construction, due to the exhaust gas from drilling, explosive blasting, slag loading, concrete spraying, internal combustion engines and transport vehicles, there is too little oxygen in the tunnel, and various harmful gases and rock dust are released in the stratum during excavation, which makes the air in the narrow space in the tunnel very turbid and dirty, which greatly threatens human health. It is necessary to replenish fresh air to caves, eliminate harmful gases and reduce dust concentration. An effective and universal method is to use various ventilators and air ducts to exhaust dust and ventilate.
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