Method for distributing external wall temperature measuring acquisition points of high-temperature piping system of power station boiler

Abstract

The invention relates to a method for distributing external wall temperature measuring acquisition points of a high-temperature piping system of a power station boiler in the technical field of power station boilers. The method comprises the following steps of: precalculating the temperature of a working medium in a furnace, the temperature of a pipe metal inner wall, the temperature of a pipe wall and a metal stress intensity allowable temperature value of each point of each pipe of each screen of each piping under various loads; calculating the allowance of intensity wall temperature according to the wall temperature and the allowable temperature value of each point of each pipe of each screen; sorting the allowance of the wall temperature, and determining layout positions of the external wall temperature measuring acquisition points among the screens and on each pipe in the same sheet; and arranging the measuring acquisition points additionally on the pipes which are easy to plug by foreign bodies during installation. According to the method, an on-line monitoring system detects and calculates the minimum allowance of wall temperature in the furnace in all pipes in real time to determine the pipes which are most dangerous in pipe blast due to overtemperature, so the piping systems of a superheater and a reheater of the power station boiler are safe and economic in running, and the direct data support is provided for the state overhauling of the boiler.

Description

technical field [0001] The invention relates to a method in the technical field of power plant boilers, in particular to a layout method for measuring and collecting points on the outer wall temperature of a high temperature tube system of a power plant boiler. Background technique [0002] In recent years, with the rapid development of my country's power generation industry, a large number of supercritical and ultra-supercritical generating units have been put into operation. With the increase of boiler evaporation, temperature, pressure and other parameters, metal materials have been used close to the highest temperature resistance level. In terms of stress overtemperature The margin is getting smaller and smaller. Many factors during operation will cause problems such as excessive material strength and excessive oxide skin in the tube, which will fall off and block the tube burst. Boiler tube burst accidents will not only cause tens of millions of direct economic losses, ...

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Problems solved by technology

[0005] The disadvantage of this technology is that only the furnace outer wall temperature monitoring system and monitoring method for ultra-supercritical boilers are proposed to adjust and optimize the combustion conditions of the boiler, and there is no optimized layout method for the furnace outer wall temperature measurement points

[0007] The disadvantage of this technology is that it only involves the supplementation and installation of temperature measuring points on the water wall of a specific boiler for a 1000MW ultra-supercritical tower boiler and the outer wall of the superheater and reheater furnace, and it is not suitable for various boiler furnace types. The layout method of the outer wall temperature measurement points is proposed; the layout of the measurement points is not optimized from the perspective of the overtemperature margin of the inner tube wall temperature of the tube furnace

Therefore, it cannot be guaranteed that the measuring point is arranged on the pipe with the highest wall temperature; in addition, no pre-calculation is used to determine the overtemperature margin of the pipe wall temperature, so the basis for supplementing and installing the outer wall temperature measuring point of the furnace is insufficient

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