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How to run the roots blower pneumatic conveying regulation

Release date:2015-12-11 00:00 Source:http://www.zqlcfj.com Views:

     

  According to the theory of fluid mechanics, the flow of the gas process will be accompanied by the loss. After the gas is flowing through the throttle device, for example, air pressure will be reduced accordingly, also is the useful work they lost fan. Because it is all in the process of conveying gas fan, fan of energy is wasted.

  Fan point is the performance of the fan under a certain speed curve and the pipeline resistance characteristic line intersection point. Fan operation, is not always stay on the design point. It will along with the change of user requirements or external conditions change, namely fan actually in the work under the variable condition. To make the wind pressure of the fan or air to reach a target, you need to to artificially control of fan or pipe network, also known as regulation. By effectively adjust, under the condition of guarantee the stability of the fan can work, both to meet the requirements of production to flow or pressure, and to maximize the energy saving. In short, the purpose of regulation is to satisfy the performance requirements, expand (stable) conditions, to achieve energy saving, to prevent the surge.

  Fan different regulating method can achieve the same purpose, but the different energy saving effects.

  According to theoretical analysis and practice has proved that can come to the conclusion that the following four aspects.

  (1) for blower and compressor, outlet throttling loss work most. Although the relative flow Qr (the ratio of the actual flow Q and the design flow Q0) reduce, also less power. As when Q = 0.65 Q0, corresponding power reduced to about 80% of the original, but compared with other regulating mode, energy consumption is still in the lead.

  2 if the relative flow rate changed little (or adjust the depth of hours), several regulating mode power consumption. Adjusting mode which impact on the energy saving effect is not big, even not only energy saving, but because of the existence of adjusting device more power consumption (e.g., hydraulic coupler).

  (3) in general, adjust the depth, the greater the energy saving effect is significant. Therefore, carefully choose the way to adjust, in order to gain maximum benefit.

  (4) variable speed adjustment curve close to ideal curve. So, variable speed regulating mode is superior, especially adopts frequency conversion motor drive energy conservation plan for the best, but need to add frequency conversion device. For medium and small capacity variable frequency speed regulation suggest positive trial; Due to the large capacity of high voltage frequency conversion unit price is higher, should be combined with the specific situation, comprehensive comparison, to choose. All in all, both must consider regulation performance, also want to consider equipment initial investment, reliability and economy, etc., the adjusting mode can be evaluated comprehensively.



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