High temperature alarm in thrust disc inlet valve
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An elevated temperature was detected in the thrust disc on the non-driven side of the exhaust expansion turbine in our unit. Specifically, under normal operation, the inlet steam temperature is 350°C, the exhaust temperature is 85°C, and the flow rate is 280 T/H. Abnormality description: The temperature fluctuates periodically upward, with the highest reading at point A being 110°C and the lowest at 96°C; at point B, the highest reading is 100°C and the lowest is 87°C. The fluctuation cycle is approximately 2 days, and there is an overall upward trend in the temperature. There were no significant changes at other measurement points for vibration, displacement, etc. Interlock setting: High alarm at 110℃, interlock at 120℃; this thermometer provides a two-choice interlock function. Please discuss what factors could lead to such phenomena, what the consequences might be, and how they should be dealt with
It’s difficult to identify the problem at once in cases like this; it will likely take time to investigate. First of all, is your vacuum stable? Also, check whether the oil inlet and outlet pipes are unobstructed. Additionally, verify that the exhaust from the bearing box is functioning properly as well as the pressure of the isolation gas. Since the temperatures at both measurement points have increased, it’s possible to rule out instrument-related issues for now; however, it’s still advisable to check the instruments as well. In any case, proceed with a thorough investigation step by step! ! !
The fluctuations in temperature at both points basically confirm that the measured values are the true values. It is recommended that you check whether there are any changes in the lubricating oil pressure, temperature, and flow rate. Additionally, verify whether there have been any changes in the axial force, and inspect your balance pipeline system as well as the process operation parameters.