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How to properly select ventilation fans
5/18/2012 6:23:09 PMGood ventilation fans are an important condition to ensure the normal ventilation system, economic operation. Right choice options, according to the nature of the gas transportation and use of different uses of ventilation fans and ventilation fans selected to meet the air volume system, air pressure to be able to overcome the resistance of the system, but also in the most efficient or economic work within the scope of use.
Specific selection methods and procedures are as follows:
A. According to the nature of the gas transportation, the choice of the different uses of the ventilation fans. Conveying clean air, or dusty gas flows through, for example, has been purification, dust concentration does not exceed 150mg/m3, you can choose the general ventilation use; handling corrosive gases, the selection of anti-corrosion ventilation fans; transportation of flammable gases of the explosive gas or dust, using ventilation fans for explosion-proof or dust emission. Select the fan type and specifications must also be under the table or characteristics of performance on some types of product samples to determine the curve.
B. Taking into account the pipeline system air leakage may be some resistance calculation is not accurate, reliable operation, the optional air volume and pressure should be greater than the calculation of air volume and pressure of the ventilation and dust removal system, namely,
Air flow: L '= KLL (1)
Pressure: H '= KHH (2)
Where L ', H'- with the wind, air pressure;
L, and H - ventilation and dust removal system calculate the amount of wind, air pressure;
Additional coefficient of the KL - air flow, dust removal system KL = 1.1 ~ 1.15;
KH - additional wind pressure coefficient, dust removal system KH = 1.15 ~ 1.2.
C. According to the selection of the air volume L 'pressure (H'), selected the type of fan in the fan product samples, to determine the fan machine number, speed and motor power. In order to facilitate the takeover and installation, but also to select the appropriate fan outlet location and transmission. Chosen by the fan operating point in the economic context, the best in the right side of the point of maximum efficiency
D. given on ventilation fans sample the ventilation fans in the standard state (atmospheric pressure of 1.013 × 105 Pa, the temperature is 20 ° C, relative humidity of 50%), performance parameters, such as the actual operation instead of the standard state, the ventilation fans actual performance will change (except for air flow). Therefore, the choice of ventilation fans should be the parameters in the actual operating conditions conversion parameters under standard conditions, the conversion relationship is as follows:
Pa (3)
kW (4)
Formula of Hb, Nb, ρb, pb, tb - ventilation fans in the standard state (or the provisions of state) under pressure, power, air density, gas pressure and temperature, fan sample data set;
H ', N', ρ, p, t - - ventilation fans in the use of condition air pressure, power, air density, gas pressure and temperature.
Sample of ventilation fans, and some to blower performance parameters according to the gas temperature of 200 ° C or 240 ° C obtained in the conversion should be (3), tb (4) with 200 ° C or 240 ° C substitution.
E. Unless any ventilation fans can meet the requirements, or require ventilation fans, air pressure and wind have significant changes in use, or should try to avoid two or more wind turbines in parallel or in series. Due to the joint work of two or more ventilation fans, each fan the role should be used alone than the time difference.
F. Continuously improve the efficiency of the ventilation fans in recent years due to the continuous improvement of the structure of the ventilation fans, the constant noise reduction, some of the new ventilation fans is gradually replacing some of the old fan. In order to save energy and reduce noise hazards, under the premise that to meet the required air volume and pressure, high efficiency, low noise ventilation fans should be used wherever possible.
