A Stall Detection And Prevention System For Axial Flow Fans In Primary Air System Of Thermal Power Plants

Abstract: The invention relates to a stall detection and prevention system for axial flow fans in primary air system of thermal power plants, comprising; a dynamic fan behaviour (DFB) module receiving inputs representing input current, damper angle, air flow volume of previous time step, and air pressure head of previous time step together termed as initial conditions; a stall nearness probability estimation module (SNPE) to receive inputs for every predetermined intervals constituting predicted outputs by the DFB module with one time-step delay to predict a sequence of air-flow volume and air pressure head for each time step, wherein the DFB module predicting the outputs for a predetermined length of time after every predetermined interval; a memory device to store all pairs of predicted volume and pressure head for said predetermined number of time steps; a plurality of checking devices incorporated with a control logic to initiate course of preventing action based on the probability of severity of the stall occurrence estimated by the SNPE module; an automated controller to process the received data and transmit control instructions, wherein the probability of severity in the first checking device is found to be less than 0.75 indicating working of the fan within safe zone, and the automated controller allows flowing of the signals to the second checking device wherein the probability of severity if found to be > 0.75 and < 0.80 by the automated controller, a first level of warning is raised to the operator indicating the working status of the fan in a moderate zone, wherein the probability of severity of stall occurrence in the third checking device is found to be >0.80 and <0.90 by the automated controller, a second level of warning is transmitted to the operator, and wherein the probability of severity to stall occurrence exceeds 0.90, the system directs the auto-controller to bring back the fan in normal state of operation, the probability being high to reach a stall occurrence. {FIGURE 4}

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