Method for soft measurement of smoke temperature of outlet of hearth based on real-time slagging condition of hearth

Abstract

The invention discloses a method for soft measurement of the smoke temperature of an outlet of a hearth based on the real-time slagging condition of the hearth to overcome the defects of an existing method for soft measurement of the smoke temperature of the outlet of the hearth. According to the method, the real-time slagging condition of the hearth is reflected through the heat effective coefficient of the water-cooled furnace wall during soft measurement of the smoke temperature, and the real-time changeability of the real-time slagging condition of the hearth is calculated and considered; a calculation output part mainly includes calculation of comprehensive heat transfer of the hearth and part of a convection heating surface and output of the heat effective coefficient of the water-cooled furnace wall and the smoke temperature of the outlet of the hearth; on the basis that the number of measurement points of a boiler is not increased, the quality parameter and the structure parameter of coal placed into the boiler and the real-time operation parameter of the boiler are collected, a model for real-time calculation and soft measurement of the smoke temperature of the outlet of the hearth is established by combining the heat transfer balance calculation of the hearth with the heat transfer balance calculation of the convection heating surface and considering the real-time slagging condition in the hearth; a real-time value of the smoke temperature of the outlet of the hearth can be output, the real-time slagging condition in the hearth can be provided, and the real time value of the smoke temperature of the outlet of the hearth and the real-time slagging condition in the hearth can serve as visual data references for conducting hearth ash blowing and water desuperheating of the high-temperature heating surface by operating personnel.

Description

technical field [0001] The invention relates to a soft measurement method for flue gas temperature at the furnace outlet of a power station boiler, belonging to the field of boiler operation parameter monitoring. In particular, it is a soft-sensing method for power plant boiler furnaces, based on the collected boiler operation data, and using a pre-established model to calculate the flue gas temperature at the furnace outlet. Background technique [0002] The flue temperature at the furnace outlet of a large-scale power station coal-fired boiler is the boundary that divides the boiler's radiation heat transfer and convective heat transfer, and can reflect the combustion and slagging conditions in the furnace, and the temperature directly affects the heat transfer performance of the furnace outlet superheater and It is an important parameter to determine the quality of superheated steam, and it is also an important parameter to judge whether there is a hidden danger of overhe...

AI Technical Summary

Problems solved by technology

[0006] Technical problem: The present invention will aim at the defects of the existing furnace outlet smoke temperature soft measurement method, and propose a furnace outlet smoke temperature soft measurement method based on the real-time slagging of the furnace

Images