How to solve the energy consumption problem of aeration fan in sewage treatment?
Time：
Mar 15,2023
According to the theory of fluid mechanics, the flow process of gas will be accompanied by loss. For example, after the gas flows through the throttling device, the pressure of the gas flow will be reduced accordingly, that is, they lose the useful work of the roots blower. Because all this happens in the process of conveying gas by roots blower, that is, the energy of Roots blower is wasted.
Roots blower for sewage treatment
In sewage treatment, the energy consumption of Roots blower aeration accounts for about half of the total energy consumption. Choosing a suitable aeration fan plays a vital role in saving operating costs. Today, the technicians of Vost environmental protection want to introduce the calculation of Roots blower selection, hoping to help you better choose to use roots blower.
Through effective regulation, it can not only meet the requirements of production for flow or pressure, but also save energy under the condition of ensuring the stable operation of Roots blower. In short, the purpose of regulation is to meet performance requirements, expand (stabilize) working conditions, achieve energy saving and prevent surge.
Roots blower can achieve the same goal with different adjustment methods, but the energy-saving effects are different. According to theoretical analysis and practical proof, the following four conclusions can be drawn.
The speed regulation curve is close to the ideal curve. Therefore, the variable-speed regulation mode is superior, especially the energy-saving scheme of variable-frequency motor speed regulation is better, but it is necessary to add a variable-frequency device. It is suggested to actively try out frequency conversion and speed regulation of small and medium capacity; Due to the high price of high-capacity and high-voltage variable-frequency speed regulation devices, we should make a comprehensive comparison and decide on the choice according to the specific situation. In short, we should consider not only the regulation performance, but also the initial investment, reliability and economy of the equipment, and evaluate the advantages and disadvantages of the regulation mode
Generally speaking, the greater the adjustment depth, the more significant the energy-saving effect. Therefore, we should carefully choose the adjustment mode in order to obtain great benefits.
If the relative flow changes little (or the adjustment depth is small), the power consumption of several adjustment methods is not different. That is, the regulation mode has little impact on the energy-saving effect, and even does not save energy, but consumes more power due to the existence of the regulation device (such as hydraulic coupling).
For aeration fans and compressors, the outlet throttling regulation method consumes more power. Although the relative flow QR (the ratio of actual flow Q to design flow Q0) decreases, the power also decreases accordingly. For example, when q=0.65q0, the corresponding power is reduced to about 80, but compared with other regulation methods, the energy consumption still ranks first.
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