Straight pipeline inner wall surface temperature measurement and transient identification method and computer terminal

Abstract

The invention relates to a straight pipeline inner wall surface temperature measurement and transient identification method and a computer terminal. The method comprises the following steps: acquiring measurement temperature data of a pipeline outer wall surface; and based on the outer wall surface measurement temperature data, performing heat conduction inversion calculation by adopting a preset method to obtain temperature data of the inner wall surface of the pipeline. According to the method, the outer wall surface temperature can be accurately obtained in real time on the premise of not damaging a loop pipeline, the inner wall surface temperature is calculated based on a heat conduction inversion analysis method, reliable input data is provided for thermal stress calculation of fatigue evaluation, repeated iteration is not needed, the problem of non-convergence does not exist, the calculation time is short, the calculation amount is small, and the temperature information of the inner wall surface of the pipeline can be accurately and quickly identified.

Description

technical field [0001] The invention relates to the field of pipeline temperature testing, in particular to a method for measuring the temperature of the inner wall surface of a straight pipeline and identifying a transient state, and a computer terminal. Background technique [0002] In the process system of nuclear power plants, temperature fluctuations are formed due to mixing of hot and cold fluids, valve leakage, etc., resulting in a large temperature gradient on the inner wall of the pipe, resulting in thermal stress on the pipe wall, which can lead to the expansion of the inherent damage defects of the pipe and induce penetration Cracks in the wall thickness may even cause thermal fatigue failure of the structure. [0003] With the prolongation of the service time of nuclear power plants, the probability of cracks and coolant leakage caused by the gradual aging of materials is increasing year by year. Therefore, it is very important to accurately obtain the temperatu...

AI Technical Summary

Problems solved by technology

However, the iterative method is time-consuming to solve, has a large amount of calculation, and is relatively easy to oscillate and diverge, which is difficult to meet the real-time output requirements of boundary conditions in actual engineering.

Images