Method for evaluating material safety of steam system after severe overtemperature of boiler

Abstract

The invention discloses a method for evaluating the material safety of a steam system after serious overtemperature of a boiler, and the method comprises the steps: carrying out the detailed data investigation of the overtemperature condition of the boiler, and confirming the parts, the overtemperature amplitude and the overtemperature time which are affected by the overtemperature according to the data; selecting the maximum overtemperature influence position of the parts subjected to overtemperature influence to perform field physical and chemical inspection, and replacing the part with the creep exceeding the standard, the structure aging exceeding the fifth level and even a phase change part; carrying out life loss calculation on the parts which do not reach the replacement index, and confirming the material damage degree and the operation safety; and enabling a life loss result to correspond to an on-site physicochemical result, and comprehensively evaluating the material safety of the part. According to the method, the steam system can be evaluated after serious overtemperature of the boiler occurs, unsafe parts of the system are quickly found out, technical support is provided for follow-up safe operation of the boiler, and guarantee is provided for safe production of electric power.

Description

technical field [0001] The invention belongs to the technical field of life evaluation of metal materials, and in particular relates to a method for evaluating the material safety of a steam system after a boiler is severely overheated. Background technique [0002] During the operation of the power station unit, due to changes in coal combustion, improper combustion control, high smoke temperature at the furnace outlet, large deviation of heat load in the furnace, insufficient air volume, incomplete combustion, local dust accumulation in the flue, improper input and stop of desuperheating water, unit start-up and shutdown and accidents Improper handling and other situations will cause the boiler to overheat. Different overtemperature ranges and time will cause different damages to the materials of different components in the steam system. It will cause non-stop or even personal injury and death accidents caused by equipment failure. At present, there is no systematic metho...

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Problems solved by technology

[0002] During the operation of the power station unit, due to changes in coal combustion, improper combustion control, high smoke temperature at the furnace outlet, large deviation of heat load in the furnace, insufficient air volume, incomplete combustion, local dust accumulation in the flue, improper input and stop of desuperheating water, unit start-up and shutdown and accidents Improper handling and other situations will cause the boiler to overheat. Different overtemperature ranges and time will cause different damages to the materials of different components in the steam system. Non-stop or even personal injury or death caused by equipment failure

At present, there is no systematic method for evaluating components after severe overheating in China, and most of them are based on the experience of operation and maintenance personnel

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