On-line prewarning device and prewarning method for iron scale blockage in high-temperature pipeline of super-critical boiler

Abstract

The invention discloses an on-line prewarning device and a prewarning method for iron scale blockage in a high-temperature pipeline of a super-critical boiler. The on-line prewarning device comprises temperature sensors, a data collector, a data analysis system, a prewarning controller and alarm equipment which are in signal connection in sequence, wherein the temperature sensors are distributed on high-temperature pipelines near an outlet header of the boiler. Since the wall temperature of a pipeline of the super-critical boiler and the iron scale blockage in the pipeline have strong coupling relationship, when the temperature departure of the pipeline is greater than a preset value delta 1, and the wall temperature change rate is greater than a preset value delta 2, i.e. iron scale blockage existing in the pipeline can be forecast, and a blockage prewarning signal is sent. The prewarning device can also display the temperature of different high-temperature tube panels and pipeline walls of the super-critical boiler and the real-time data, history data of the change rate of the super-critical boiler, and has the functions of overtemperature alarm and trend alarm. By adopting the invention, the phenomenon of iron scale blockage in high-temperature pipelines can be forecast quickly, so that the purpose of on-line real-time monitoring and prewarning iron scale blockage in high-temperature pipelines of the super-critical boiler can be achieved.

Description

technical field [0001] The invention is used for early warning of scale blockage in the high-temperature heating surface of a boiler in a thermal power plant, and particularly relates to an online early warning device and method for scale blockage in a high-temperature tube of a supercritical boiler. Background technique [0002] With the continuous and rapid development of the economy and the strong demand for electricity, the electric power industry has developed rapidly. Thermal power generation units are gradually developing towards large capacity and high parameters, but boiler tube burst has become the primary cause of power plant reliability reduction, especially the scale on the inner wall of the high-temperature heating surface of supercritical boilers will peel off under certain conditions and block the heating surface pipes , resulting in short-term overheating of the heating surface of the boiler and tube burst. As early as the end of the 1950s, foreign research...

AI Technical Summary

Problems solved by technology

[0003] The number of pipes in the high-temperature tube panels of supercritical boilers is extremely large, and the layout of the pipes is also very complicated

So far there is no early warning device and method for on-line monitoring of scale blockage in boiler high temperature tubes

Many power plants have adopted the passive method of "checking every shutdown" and "cutting and replacing pipes in case of doubt", which has brought huge economic losses to the power plants and also posed a threat to the safety and stability of the power grid.

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