State evaluation method of a subcritical boiler drum body based on offline inspection

Abstract

The invention discloses a state evaluation method of a subcritical boiler drum body based on offline inspection. The method comprises the steps of: 1) determining an evaluation object and basic information; 2) determining the specific stage of the whole life cycle of the evaluation object; 3) calculating a correction factor Cf; 4) calculating a state factor CS; 5) determining detailed evaluation points; 6) making an offline inspection scheme and implementing the offline inspection scheme; 7) obtaining an offline inspection result; 8) evaluating the state of the evaluation point; 9) evaluating the state of the evaluation object; and 10) filing and feeding back evaluation results. The method can help thermal power plant technicians to make maintenance strategies better.

Description

technical field [0001] The invention belongs to the technical field of state evaluation of thermal power plant equipment, in particular to a method for state evaluation of a subcritical boiler drum body based on off-line inspection. Background technique [0002] The drum is an important part of the subcritical boiler system of a thermal power plant. First of all, in the face of the increasingly severe external environment, subcritical units have gradually undergone flexible transformation and participated in deep peak shaving. They are in relatively harsh working conditions during operation and are easily affected by thermal alternating loads. In particular, the drum body is a part with a large wall thickness, and the temperature difference between the inner and outer walls is linearly distributed along the wall thickness. The greater the thickness, the greater the temperature difference and the greater the stress. Secondly, domestic subcritical units were put into operatio...

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Problems solved by technology

Third, since the drum is located outside the boiler, if the main body leaks, there is a high risk of causing major personal safety and economic losses. Therefore, it is necessary to evaluate the state of the subcritical boiler drum body more accurately

These complex conditions determine that the development of technologies such as stress analysis and life loss calculation is limited to professional technical institutions and personnel, and the collection of these basic materials and data, complete and comprehensive off-line inspection and laboratory analysis will lead to power plant maintenance costs and increase in labor costs

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