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# How to select explosion-proof blower?

2022-06-08 10:08
Explosion-proof blowers are used in flammable and explosive gas sites to avoid some flammable and explosive to cause safety accidents. Explosion-proof blowers are widely used in factories, cooling towers, vehicles, ships and buildings; Boiler and industrial furnace ventilation ventilation; Cooling in air conditioning equipment and household appliances and household electrical ventilation; Drying and grain selection; Air tunnel through wind and air conditioning bulletproof device and air conditioning.

However, when the explosion-proof blower meet transport gas, in use process contains flammable explosive material, dust, smoke or volatile materials, due to the electrical short circuit, line fault and wind turbine impeller, wind turbines in the spark friction, it will ignite explosion, transport of materials or gas lead to serious safety accidents, therefore, explosion-proof blower selection is particularly important. Next, xiaobian will introduce some problems that need to pay attention to the selection of Explosion-proof blowers. blower air volume: wind speed V and airway cross-sectional area F of the product. Because wind speed can be accurately measured by wind speed, the air volume is also simple, and the air volume can be calculated directly using the formula Q = VF. Based on the number of ventilation in the selected room, the determination of the number of blowers requires the calculation of the total amount of air required by the plant and thus the number of blowers. Calculation formula: n = V x N/q Where: N - blower number (Taiwan); V - Site volume (M3); N - Number of ventilation (times/hour); Single typesetting of the Q-blower model (M3 / h). The selection of blower model should be based on the actual situation of the factory, try to use the original window size to select the blower model, the blower and the wet curtain must keep a certain distance (as much as possible on both sides of the plant gable), to achieve good ventilation ventilation effect. The exhaust side is not close to nearby buildings to prevent nearby housing. Wind pressure: Refers to the endurance overcome during this multi-air transport, indicating an increase.

However, domestic blower options are usually pressed by full pressure and are usually extruded abroad. Treatment air machine = blower full pressure - air cabinet treatment section resistance, return air pipe is usually 7 ~ 8pa/m, 90 degrees, 10pa/a calculation resistance. Empirical formula: overseas pressure = full blower pressure - resistance of each process section blower power (W) = air pressure (L/S) * wind pressure (KPA)/efficiency (75%)/force (75%) Full pressure = static pressure + dynamic pressure. blower motor power (W) = blower power (W) * 130% = air volume (L/S) * wind pressure (KPA)/efficiency (75%)/Power (75%) * 130% It is said that the surface treatment of Explosion-proof blowers and axial blowers is different. First consider the choice of coating, centrifugal center temperature is usually mild, high temperature, the use of coating. Different. Always temperature centrifugal wind turbines and axial flow blowers choose the same coating, but high temperature blowers must use high temperature resistant coating. Explosion-proof blower, no blower Angle difference, through the blower blower page rotation to drive the blower. Different from the place where the blower is installed, the former is located in the back of the boiler, blowing to the boiler outside the boiler, producing negative pressure to the furnace, flue gas way, so the air machine; By contrast, it is located at the front end of the boiler and blows into the boiler, so call the blower.

The condensate drain pipe of the blower coil unit must have a certain slope and shall be guaranteed to be water in the drip board. Installation of wind turbine installations can be found in the building standard design ATLAS 01K403 "blower Coil Installation". In the room, wind turbines often leak, if not pipes, and if valve components are damaged, it is usually caused by condensation. With the normal operation of the explosion-proof blower, the noise will not be eliminated. Studies have shown that noise is generated only when wind speeds exceed 0.75 m/s. Of course, the lower the wind speed, the less noise it makes. Noise is a harmful pollution. That's not a blower option. The less noise, the better? Noise is all very well, but the economy must be considered. The lower the noise, the higher the cost of the blower, the higher it is. Reduced by about 10 decisions, wind turbine costs have risen (empirical, non-linear). Most blowers have noise levels less than 35 dBA. So when choosing a blower, you don't have to go for low noise, you can accept the reasonable range of what you can accept.

Choose Explosion-proof blowers to pay attention to the following problems: 1. Determine the type of ventilator according to different purposes. For example, when air is being transported, a general ventilation ventilator can be chosen; When corrosive gas transportation, should choose anti-corrosion blower; When transporting fuel to burn blowers or dust, use explosion-proof vents or ventilation blowers. Wait. 2. Determine the blower model based on the amount of air required, dust and selected breathing model. 3. In order to facilitate the connection and installation of ventilators and system pipes, appropriate ventilators outlet direction and transmission method should be selected.
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