Comparison of Long Shaft Fan and Opposite Cyclone:
Basic Situation: under the existing air volume of 5400, the negative pressure is 2350, the section is small, and the resistance coefficient of ventilation pipe network is large, which belongs to a high negative pressure mine.
Comparison of Operating Conditions: the long axis fan is suitable for low negative pressure operation, and the main fan of rotary axial flow is suitable for high negative pressure operation. Due to the structural characteristics of the rotary axial flow main fan, the rear stage host is mainly designed to improve the negative pressure auxiliary air volume. The coordination between the front and rear stages improves the air volume and makes the negative pressure range is wider, so as to provide the guarantee for the air supply in the difficult times in the later period.
Efficiency Comparison: the efficiency of the main fan of the rotating axial flow is 85%, the actual operating efficiency of the long axis fan is 60%, this is because the kinetic energy loss of the fan, the greater the kinetic energy, the higher the loss efficiency, we choose 28 machine, the long axis fan generally corresponds to 25-26 machine, the greater the section, the lower the wind speed, the lower the kinetic energy. The smaller the section of the long-axis fan, the faster the wind speed, the greater the kinetic energy, the lower the efficiency, and the greater the noise.
Noise Comparison: in addition, the long axis fan only uses one motor, in order to meet the requirements as far as possible, improve the motor speed, reduce the series, low efficiency, resulting in high noise than the main rotary axial flow fan.
Comparison of Maintenance and Installation Cost: long axis classification has great requirements for foundation installation, and the infrastructure cost is much higher than that of cyclone. Long axis fan blade early adjustable, its principle is the hydraulic transmission, using hydraulic pump, because they are mainly suitable for the coal, for coal corrosion gas, dust accumulation cause stuck, so many users reaction its blade two or three years later, the blade spare parts and hydraulic transmission replacement cost is also very high. Compared with the long shaft fan, the shaft breaking phenomenon also happens from time to time, and the daily maintenance cost is large.
Energy Saving Comparison: the long axis fan does not use frequency conversion speed regulation but uses soft start to start, which cannot achieve the purpose of energy saving and consumption reduction in the case of easy ventilation and difficult ventilation. For the cyclone, the appropriate air volume and negative pressure working points can be adjusted according to the front and back working conditions, so as to make the fan run more efficient and achieve the purpose of energy saving.
Conclusion: To sum up, for the southern mine, especially the high negative pressure mine, the energy consumption can reduce the cost of infrastructure and daily maintenance, and reduce the noise. The current ventilation resistance coefficient of Tu Cheng Mine is also not suitable for the long-axis fan.
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