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Real-time monitoring and preventing method for surge and stall of axial flow fan

An axial flow fan, real-time monitoring technology, applied in pump testing, mechanical equipment, machines/engines, etc., can solve problems such as damage to fan equipment, unit safety, adverse effects on stable operation, and impact on the stability of boiler combustion conditions, and achieve combustion The effect of stable working conditions

Active Publication Date: 2012-07-25
西安兴仪启动发电试运有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Defects in the use of the surge stall alarm switch: the use of the surge stall switch as a means of monitoring the operating status of the axial flow fan is obviously lagging behind. Equipment damage occurs, and even affects the stability of the boiler's combustion conditions, resulting in boiler MFT tripping, which adversely affects the safe and stable operation of the unit
[0005] The surge stall switch described above, as a "post-processing" method for early warning of the current fan accident state, can no longer meet the needs of long-term safe and economical operation of the generator set. A method for real-time online monitoring of surge stall phenomena during operation and prevention of accidents in advance

Method used

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  • Real-time monitoring and preventing method for surge and stall of axial flow fan
  • Real-time monitoring and preventing method for surge and stall of axial flow fan
  • Real-time monitoring and preventing method for surge and stall of axial flow fan

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Embodiment Construction

[0020] The left half of the performance curve of the axial flow fan has a saddle-shaped area. In this area, the flow rate, pressure head and power of the fan will fluctuate greatly, and the fan and pipeline will generate strong vibration and equipment operation noise. Abnormal working conditions such as significant increase are generally called "surge", and this unstable working condition area is called the surge area. like Figure 4 As shown in the Q-H performance curve of the axial flow fan, if the flow rate of the fan is reduced by the throttling adjustment method, if the working point of the fan is on the right side of the K point, the work of the fan is stable. When the flow rate of the fan is Q<QK, the maximum pressure head generated by the fan will decrease accordingly, and it will be smaller than the pressure in the pipeline, because the capacity of the air duct system is large, and the pressure in the air duct at this moment is still HK , so the pressure in the air d...

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Abstract

The invention discloses a real-time monitoring and preventing method for surge and stall of an axial flow fan, wherein the method can monitor parameters of installation angles, air quantity, pressure heads and the like of a movable blade of a fan in real time and send monitoring values into a working point corresponding to a fan performance curve in a monitoring system to compare whether the working point is around a surge and stall alarm zone of a running curve to timely judge and early warn. The real-time monitoring and preventing method can timely find safety hazards in running of the fan, hysteresis quality of monitoring and prevention is eliminated, stability of burning work conditions of a boiler is effectively guaranteed, and a machine set is led to run safely and stably.

Description

technical field [0001] The invention belongs to the field of axial-flow fans, and relates to a detection and accident prevention method for the working conditions of the axial-flow fans, in particular to a real-time monitoring and prevention method for the surge and stall of the axial-flow fans. Background technique [0002] Axial flow fan is a low head, high flow fan, its superiority is increasingly recognized by everyone, and widely used in various industrial fields. The structure of the axial flow fan is complex, and there are many rotating moving parts, so its reliability is slightly worse than that of the centrifugal fan, which is mainly reflected in the surge stall of the fan. When the fan surges, the strong periodic back-and-forth flow of the airflow will cause the noise to increase, the stress on the blades will increase, and a large impulsive force will be generated on the impeller, the bearing and its connecting parts. When these forces increase to a certain extent...

Claims

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Application Information

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IPC IPC(8): F04B51/00
Inventor 左霖张志军
Owner 西安兴仪启动发电试运有限公司
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