Selection Principle of Ventilator in Sichuan

Gas compression and gas transport machinery is the mechanical energy of the rotation is converted into gas pressure energy and kinetic energy, and the gas is transported out of the machinery. Fan is the abbreviation of my country's habit of gas compression and gas transportation machinery. Generally speaking, fans include fans, blowers, compressors and Roots blowers, but do not include piston compressors and other volumetric blowers and compressors. So how should Sichuan ventilator choose?

1. Before choosing a ventilator, you should understand the production and product quality of domestic ventilators, such as the production of ventilator varieties, specifications and special uses of various products, as well as the ministry of excellence, national excellence products, eliminated or to be eliminated products, new products The development and promotion of the situation, etc., should also fully consider the requirements of environmental protection in order to choose a fan.

According to the different physical and chemical properties of the gas transported by the ventilator, choose the ventilator for different purposes. Such as conveying explosive and flammable gases should be selected explosion-proof ventilator; dust or conveying pulverized coal should be selected dust or pulverized coal ventilator; conveying corrosive gases should be selected anti-corrosion ventilator; working in high temperature or conveying high temperature gas should be selected high temperature ventilator.

3. When there are more than two kinds of ventilators to choose from on the ventilator selection performance chart, priority should be given to the one with higher efficiency and smaller machine number: the one with larger adjustment range, of course, should be compared and decided by weighing the advantages and disadvantages.

4. If the diameter of the selected fan impeller is much larger than that of the original fan impeller, in order to make use of the original motor shaft, bearing and support, the starting time of the motor, the strength of the original parts of the fan and the critical speed of the shaft must be calculated.

5, the choice of centrifugal fan, when the motor power is less than or equal to 75kW, can not be installed only to start the valve. When high temperature flue gas or air is discharged and centrifugal boiler induced draft fan is selected, start-up valve shall be set to prevent overload during cold operation.

6. For ventilation systems with noise reduction requirements, first select a fan with high efficiency and low impeller circumferential speed, and make it work at a high efficiency point; it should also be based on the transmission mode of noise and vibration generated by the ventilation system. Noise reduction and vibration reduction measures. Vibration reduction measures for fans and motors can generally be based on vibration reduction, such as spring shock absorbers or rubber shock absorbers.

7, in the selection of fans, should try to avoid the use of fans in parallel or series work. When unavoidable, should choose the same type, the same performance of the ventilator joint work. When series connection is adopted, there should be a certain pipeline connection between the stage ventilator and the second stage ventilator.

8. The selected new fan should consider making full use of the original equipment, suitable for on-site production, installation and safe operation.

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