Monitoring system and method for heat transfer characteristic of water wall tube of utility boiler

Abstract

The invention relates to a monitoring system and method for the heat transfer characteristic of a water wall tube of a utility boiler. The monitoring system and method are used for monitoring the temperature of different positions of all water walls of the boiler. The monitoring system comprises heat transfer characteristic monitoring device sets installed at different positions of the water walls of the boiler, a data collector, a data displayer and a furnace combustion control computer. Each heat transfer characteristic monitoring device on the water wall tube comprises at least three temperature measuring elements, wherein the temperature measuring elements are arranged at specific positions of the device respectively and used for measuring the temperature of the side facing fire and the side back to fire of the measured water wall tube and the temperature of a working medium. Through arrangement of the monitoring devices at different positions of the boiler, the heat transfer characteristic, including the temperature of the wall on the side facing fire and the wall on the side back to fire of the water wall tube and the temperature of the working medium in the water wall tube, of the water wall tube of the boiler can be monitored in real time, and change of a flame in the boiler along with change of the heat transfer characteristic of the water walls, change of the heat transfer characteristic of the working medium and change of the temperature distribution characteristic of metal materials of the water walls are convenient to grasp.

Description

technical field [0001] The invention relates to the technical field of coal-fired power generation, in particular to a monitoring system and method for monitoring heat transfer characteristics of water-cooled wall tubes of power plant boilers. Background technique [0002] Boiler water wall tubes are important equipment for power plant boilers. The feed water of the boiler enters the water wall of the boiler through the lower header of the water wall. The feed water receives heat from the flame in the furnace from bottom to top in the boiler tubes, and gradually turns into steam-water mixture or steam. Then it enters other heating surfaces to continue heating and then enters the steam turbine to work to generate electric energy. The transfer characteristics of the cold wall tube have a direct impact on the vaporization process of the feed water in the boiler tube heated by the flame in the furnace. Viscosity coefficients have undergone drastic changes, coupled with the larg...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a monitoring method and system for the heat transfer characteristics of the water-cooled wall tube of a power plant boiler, which can comprehensively monitor the heat transfer characteristics of the water-cooled wall, including the temperature and heat flow changes on the fire side, the steam-water side The state of the heat transfer characteristics such as the physical parameters of the working fluid and the temperature difference between the inside and outside of the water-cooled wall tube is helpful to timely discover and solve the reasons such as poor combustion control, deficiencies in the design or operation of the steam-water system, and improper control methods for variable operating conditions. Problems such as overheating of the water wall caused by

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