Over-temperature risk indicator-based boiler heating surface monitoring method

Abstract

The invention discloses an over-temperature risk indicator-based boiler heating surface monitoring method. The method comprises the following steps of: 1) constructing a boiler heating surface parameter and a wall temperature measurement point information table; 2) setting a wall temperature alarm threshold of each section of furnace tube according to the type of a furnace tube material of a heating surface; 3) reading wall temperature data of the heating surface in real time; 4) judging a data state, namely switching to a step 5) when an over-temperature process is started, switching to a step 6) in the over-temperature process, switching to a step 7) after the over-temperature process is finished, and switching to the step 3) if the data is normal; 5) forming a new out-of-limit record and recording related information; 6) calculating an over-temperature risk value of the current over-temperature process, accumulating the over-temperature risk values of the part, and switching to the step 3); and 7) finishing the current out-of-limit process, forming a complete out-of-limit record and switching to the step 3). By the method, an indicator in an over-temperature degree, namely an over-temperature risk, is accurately evaluated; and a calculation method has a strict theoretical basis, so the over-temperature risk evaluation of the heating surface is fast, accurate and evidence-based.

Description

technical field [0001] The invention belongs to the field of over-temperature monitoring of boiler heating surfaces in thermal power plants, and specifically relates to a method for monitoring boiler heating surfaces based on over-temperature risk indicators. The risk ranking of each part of the face. Background technique [0002] The heating surface of a thermal power plant boiler mainly includes a water wall, a superheater, and a reheater. It absorbs the radiation heat and convective heat of the high-temperature flue gas in the furnace to heat the steam medium in the tube into high-temperature and high-pressure steam that meets the requirements. Due to improper operation, structural defects of the tube panel, foreign matter blockage, etc., the deviation of the flue gas temperature and the uneven flow of the steam are often caused, which in turn causes some furnace tubes to overheat or even burst, which seriously affects the safe operation of the boiler. Therefore, for a l...

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Problems solved by technology

[0006] However, the information provided by the existing system is limited to the duration, magnitude, start time, end time, etc. of previous overheating events, and there is no relevant literature that proposes an index for comprehensively evaluating the severity and cumulative impact of overheating.

As a result, technicians can only roughly estimate the severity of overheating in each part based on experience, and the conclusions drawn by different people are quite different

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