System for monitoring fire facing side wall temperature of water cooled wall of power station boiler on line, and monitoring method

Abstract

The invention belongs to the technical field of on-line temperature monitoring of a wall cooled wall, and particularly relates to a system for monitoring the fire facing side wall temperature of a water cooled wall of a power station boiler on line, and a monitoring method. The section of a furnace is provided with sound wave receiving and sending systems, each sound wave receiving and sending system consists of a sound wave guide pipe, an electrodynamic loudspeaker, and a special electret microphone; and receiving and sending measurement points of the sound wave receiving and sending systems are distributed on a heating side of the same side of the water cooled wall. The method comprises the following steps of: sending sound signals by the electrodynamic loudspeaker, receiving the sound signals and converting the sound signals into voltage signals by an enhanced microphone simultaneously, allowing the voltage signals to pass through a cable input signal conditioner and enter a data acquisition card, and converting the voltage signals into digital signals; obtaining time of flying by generalized cross correlation time delay estimation; and calculating the fire facing side wall side temperature of the water cooled wall by a computer and software. The system is not limited by severe environments such as high temperature, corrosion, dustiness and the like in the furnace, can truthfully reflect the fire facing side wall side temperature of the water cooled wall, avoids pipe explosion phenomena, and reduces accident rate and operation cost.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of water-cooled wall temperature, and in particular relates to an on-line temperature monitoring system and a monitoring method of a water-cooled wall of a power plant boiler facing a fire side. Background technique [0002] At present, there are many methods for measuring the temperature of the water-cooled wall of power plant boilers. Generally, there are two main methods: (1) measuring the temperature of the tube wall on the fire side, and (2) measuring the temperature of the tube wall on the back-fire side. [0003] To measure the temperature of the tube wall on the fire side, install the thermocouple measuring end on the tube wall on the fire side in the furnace, and then apply spray coating and other processes, which can improve the accuracy of wall temperature measurement and prolong the service life of the thermocouple. However, thermocouples are always affected by harsh conditi...

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Problems solved by technology

[0006] In order to overcome the shortcomings of the existing on-line monitoring device for water-cooled wall temperature, which cannot adapt to harsh environments such as hi...

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