Method for detecting wall temperature of steam heating surface of boiler

Abstract

The invention discloses a method for detecting the wall temperature of a steam heating surface of a boiler. The method specifically comprises the following steps: step 1, selecting the steam heating surface of the boiler to be detected; step 2, sequentially arranging thermocouples on to-be-measured points on the heating surface wall of the boiler along the width direction of the boiler; step3, fixing the thermocouple to the steam heating surface wall of the boiler through deposited metal; step 4, linearly leading out a lead of the thermocouple from the top of the boiler, and connecting the lead with a recording device to obtain the temperature of a to-be-measured point on the steam heating surface of the boiler; step 5, monitoring and analyzing the wall temperature data of the boiler through a computer; and step 6, carrying out visual display on the wall temperature data by utilizing different colors. According to the method, the thermocouple is directly connected to the boiler tube wall for direct temperature detection, real wall temperature data of different positions of the boiler steam heating surface wall are obtained, and the problems that the detection mode of the boiler steam heating surface wall temperature is inaccurate, and the wall temperature data of the different positions of the steam heating surface are difficult to detect are solved.

Description

technical field [0001] The invention relates to the technical field of dynamic virtual reality for boiler heating surface failure analysis and prevention, in particular to a detection method for boiler steam heating surface wall temperature. Background technique [0002] Boilers refer to medium and large boilers in power plants that provide steam turbines with a specified quantity and quality of steam, and are one of the main thermal equipment in thermal power plants; boilers generally include "water walls", "superheater tubes", "reheater tubes", "Economizer tube", referred to as "four tubes", collectively referred to as the heating surface, can be simply understood as a device in which water is heated in the pipe (heating surface) to become high-temperature steam. [0003] The boiler heating surface covers a very wide range, and the spatial structure is also extremely complex. The materials and working conditions of each part are also different. The causes, mechanisms and m...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a method for detecting the wall temperature of the heated surface of boiler steam. The method for detecting the wall temperature of the heated surface of boiler steam provided by the present invention is to measure the temperature by directly connecting the thermocouple to the boiler tube wall. The real wall temperature data at different positions of the boiler steam heating surface wall can be obtained through direct detection, which solves the problem of inaccurate detection of the boiler steam heating surface wall temperature and the difficulty of detecting the wall temperature data at different positions of the steam heating surface, which affects the life of the material The evaluation is more accurate and more instructive. At the same time, the online monitoring and analysis of the wall temperature data is carried out through the computer, and the visual display is displayed through the graphic image. The form of the curve can more intuitively reflect the change of the temperature of the tube wall at different positions on the heating surface with time. It is convenient for the operator to understand the change trend of the boiler steam heating surface wall temperature. It also includes the overtemperature situation of each heating surface wall temperature in the form of a list and an overtemperature bar graph. The purpose is to compare the heating surface wall temperature with the allowable If it exceeds the allowable maximum temperature, it will be prominently displayed in red font in the over-temperature statistics table, and the specific over-temperature value and over-temperature operation time will be given to remind the operating personnel, so as to facilitate the realization of The status tracking of boiler leakage and hidden danger parts, division of early warning levels, and risk early warning monitoring are carried out to realize effective and timely prevention and treatment of hidden danger parts of leakage. The present invention provides the following technical solutions:

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