Performance forecast for boiler heating surfaces regarding the internal stresses during the start-up operations

Abstract

The problem of diagnosing the origin, development and accumulation of damage to the microscopic and submicroscopic level becomes relevant, because the main resource of energy equipment is implemented in the development of short microstructure cracks and micro defects. This required the introduction of specific parameters of the substructure, such as internal structural residual stresses affecting the stability of the resource, which allow the use of the microscopic approaches to the assessment of natural internal structural reserves of pipe metal of boiler heating surfaces of its reliability and durability. The paper demonstrates the possibility of considering internal structural stresses during hydraulic testing as a critical controlling operation at start-up operations of various types boilers. It is concluded that pressure used in practice for hydraulic testing calculated by a standard procedure can result in destruction of structural grain of boiler steel members under internal pressure and in reduction of their operational reliability.

Keywords

• structural granule
• internal stress
• brittle fracture
• hydraulic testing parameters
• lifetime