Method of estimating boiler water-cooled wall residual stress

Abstract

The invention relates to a method of estimating boiler water-cooled wall residual stress, comprising the steps of (a) setting a plurality of residual stress test points on a water-cooled wall tube panel; (b) drilling at the residual stress test points, attaching three strain gages around each hole with the strain gages forming an included angle with one another, and measuring stress release coefficient A and stress release coefficient B of the water-cooled wall tube panel both shown in the specification, wherein Epsilon<1> is post-drilling release strain of the strain gage R<1>, Epsilon<2> is post-drilling release strain of the strain gage R<2>, and Sigma is axially applied stress; (c) calculating post-drilling stress state of each test point according to an equation shown in the specification, wherein Epsilon<3> is post-drilling release strain of the strain gage R<3>, and Theta is an included angle of main stress Sigma<1> direction and R<1> axial direction. The residual stress is tested by means of Mathar method, and stress distribution state of a boiler water-cooled wall in installation, debugging and the initial stage of commissioning is experimentally studied.

Description

technical field [0001] The invention belongs to the technical field of boiler water cooling walls, and in particular relates to a residual stress evaluation method of boiler water cooling walls. Background technique [0002] Energy is the basis for the survival and development of the national economy. With the rapid development of the world economy, the demand for energy in various countries is increasing, and energy shortage has become an important factor restricting the sustained and rapid development of the economy, and has been listed as one of the three major problems in the world. In order to effectively solve the energy shortage, the improvement of energy utilization efficiency has become one of the solutions. In order to achieve the improvement of energy utilization efficiency, thermal power generation continues to develop towards high parameters and high capacity. [0003] The 1000MW ultra-supercritical tower boiler appeared in response to this technological develo...

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Problems solved by technology

[0003] The 1000MW ultra-supercritical tower boiler appeared in response to this technological development trend. However, after the first domestically-made ultra-supercritical tower boilers were put into production in 2010, frequent early cracking and leakage of the water-cooled wall T23 installation welds occurred successively. , leading to frequent abnormal downtime, resulting in huge economic losses

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