Monitoring Method For Dynamical Stress Of Blower Vane

As one of key equipment in systems for gas purification and waste water treatment, etc, in coal chemical plant, centrifugal blower's stable, safe and reliable operation has a direct impact on regular production of coal chemical plants and power supply for citizens. Being the crucial element of a blower, vane's running status determines performance of a blower, for which it is of great significance to monitor vane running status. The main research works and results include:Firstly, by analyzing the advantages & disadvantages of the present monitoring methods for vane status which mainly include two types:contact monitoring and non-contact monitoring, a new monitoring method for dynamical stress of centrifugal blower vane which is based on the FBG sensing technique is proposed in this paper, and the blower vane stress monitoring system is consisting of FBG sensors, FBG interrogator and fiber optic rotary joint.Secondly, by using the software of PROE the centrifugal blower model was build.Then, the software of ANSYS will analyze the vane static stress under the different angular speeds, which can find the areas of the max stress. The conclusion will do some help to the following step of paste FBG sensor.Finally, the monitoring method has been applied to the field experiment. And blower vane stress monitoring method using bare fiber grating as strain sensors is expressed in details and sticking method for FBG sensors is introduced particularly. According to analysis on data from field experiment of a centrifugal blower experimental model, it is found following conclusions:within working rotary speed range of the blower, stresses at inlet and outlet of the vanes increase in company with increment of rotary speed, and variation value of the inlet is more distinct, however, the relation between vane inlet & outlet stresses and rotary speed is not of linear. Measurement results of vane stress monitoring based on FBG sensing technique are real and reliable, so this method points out a new direction for monitoring of dynamic stress on rotary vanes.