Safety state evaluation method for large-diameter thick-wall part of high-parameter unit

Abstract

The invention relates to a safety state evaluation method for a large-diameter thick-wall part of a high-parameter unit, and the method comprises the steps: arranging a stress measurement point at thelarge-diameter thick-wall part of the unit, carrying out the field stress testing through an online stress monitoring device, and obtaining the actual measurement data; based on a finite element stress analysis method, carrying out numerical simulation calculation on the stress level of the position where the measuring points are arranged, and obtaining simulation data; carrying out linear fitting on the simulation data and the actual measurement data, and carrying out verification and correction on the simulation data and the actual measurement data to enable the deviation between the simulation data and the actual measurement data to be within a range of + / -5%; setting the stress early warning value of the on-site online stress monitoring device to be 80% of the allowable stress value of the corresponding material at the same temperature; setting a stress early warning value of a finite element stress analysis method to be 85% of an allowable stress value of the corresponding material at the same temperature; and obtaining a safety state evaluation result of the large-diameter thick-wall part based on the evaluation index F value. According to the invention, accurate evaluationof the safety state of the large-diameter thick-wall part is realized.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a safety state evaluation method for large-diameter thick-walled parts of a high-parameter unit. Background technique [0002] With the gradual development of the power industry, in order to meet market demand for electricity and national environmental protection requirements, the gradual commissioning and application of high-parameter and large-capacity units will be the development trend of the thermal power industry in the future. The high parameters of the thermal power unit mean that the physical parameters such as the temperature, pressure, and flow velocity of the fluid in the four major pipelines such as the main steam pipeline have been greatly increased. As the carrier of the transmission medium in the power plant, the stress level of the pipeline components will also increase significantly. With the continuous strengthening of the unit's pe...

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Problems solved by technology

As the carrier of the transmission medium in the power plant, the stress level of the pipeline components will also increase significantly. With the continuous strengthening of the unit's peak-shaving tasks, the changes in the steam-water parameters caused by the load fluctuation will inevitably aggravate the stress concentration of the pipeline components. dangerous

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