An overview of the energy saving way of fan

An overview of the energy saving way of fan
Reasonable selection of high efficiency fan 1.
In the case of the same or near the same technical conditions, the first choice of a good economic fan [5]. Because of mine ventilation machine in operation conditions need to constantly adjust, so in the choice of the fan, we must carefully analyze the selected method for adjusting the ventilator, can use these methods to adjust the fan in the operation of power efficiency to meet the economic conditions, and as far as possible so that the operating efficiency of fan is the highest. At present, China's production and use of high efficiency mine explosion-proof axial flow fan is mainly FBC (D) Z and 2K type, the maximum static pressure efficiency is about 85% [6]. However, the mine ventilation conditions are varied and complex, the existing products are sometimes difficult to meet the economic requirements of the specific mine fan, which is often encountered in the selection of the mine fan. Therefore, in the existing products or through the adjustment can not meet the economic requirements, should be based on the specific situation of the mine, the use of personalized design, designed to meet the requirements of mine ventilation and economic ventilation. According to statistics, the fan in the whole service life, more electricity consumption accounted for about 80% of total cost of ventilator, despite the use of personalized design cost is higher, but due to fan personalized design efficiency in the entire service life of high and low power consumption, in most cases can reduce the cost of ventilation.
2 adjustment method and application of mine axial fan
At present, China's production of explosion-proof axial fan adjustment methods are: throttle gate and the method of changing the blade angle adjusting method, variable speed control method [7], get rid of one stage impeller and remove part of blade. The most commonly used is the first three.
3.2.1 gate throttling method and its application
Gate throttle method through appropriate air duct dampers lead off, increasing the ventilation network resistance, the characteristic curve of the ventilation network to move up, fan operating point moves to the left, in order to achieve the purpose of reducing air volume. In the initial stage, the air volume of the fan is larger, so the method is used to reduce the air volume. This method is simple and convenient, but there is an additional loss in the damper, is not an economic adjustment method [8].
The axial flow fan, the same blade installation angle, the use of this method can not only achieve the purpose of energy conservation, but also cause energy waste. In the introduction of this method, some literatures and textbooks do not take into account the energy saving problem of axial fan. Figure 1 is the performance curve of FBCDZN022B/160 * 2 axial flow fan, fan blade installation angle of 49 degrees /41 degrees. In Figure 1, the static resistance characteristic curve of the front ventilation network is adjusted by 225kW, and the M1 is the former working condition, the air volume is 85m3/s, and the power of the static pressure shaft (the power corresponding to A in the drawing) is. In Figure 2, the static resistance characteristic curve of the adjusted ventilation network is 240kW, and the M2 is adjusted after the working condition, the air volume is 75m3/s, the static shaft power (the power corresponding to the B point in the graph) is. After adjustment, the air volume is reduced by 10m3/s, and the power of the static pressure shaft is increased by 15kW, resulting in energy waste. This is determined by the performance of axial flow fan, air volume increases, the pressure drop faster; air volume decreases, the wind pressure rises faster, but the shaft power increases.