On-line monitoring device and method for flow state of chemical cleaning pipeline of superheater in power station

Abstract

The invention discloses a device and method for the online monitoring of the circulating state of a chemical cleaning pipe of a power station superheater. During the chemical cleaning of the superheater, an individual pipe will have an air lock or deposit sediment blocking phenomenon because the resistances among parallel pipes are different. The device judges the circulating condition of mediums in the pipes through monitoring and analyzing the temperature changes of the walls of all pipes, and carried out automatic alarm for a blocked pipe. The device and method solve a problem that manual monitoring cannot be carried out because the environment temperature in a hearth is too high during the chemical cleaning of the superheater. The device and method are short in feedback time, are high in accuracy, are high in automation degree, and overcomes a series of limitations in the prior art. The device and method can achieve the real-time monitoring of the blocking conditions of parallel pipes during the chemical cleaning of the superheater, avoids pipe burst caused by the blocking of pipes during the start of a set after the chemical cleaning, and provides guarantee for the successful chemical cleaning.

Description

technical field [0001] The invention relates to the technical field of chemical cleaning of a superheater / reheater of a power station, in particular to an on-line monitoring device and method for the flow state of a chemical cleaning pipeline of a superheater of a power station. Background technique [0002] After the power station superheater has been in operation for a certain period of time, due to the continuous growth of oxide skin, the heat exchange efficiency will decrease during operation; at the same time, the oxide skin will grow to a certain thickness and will fall off, causing tube explosion, which becomes a hidden danger to the safety production of the power plant. Therefore, chemical cleaning is often used to remove the scale in the pipe. Pipe blockage or air lock is prone to occur during chemical cleaning, which affects the cleaning effect of blocked pipelines. Therefore, during the cleaning process, it is necessary to monitor the circulation of the pipeline,...

AI Technical Summary

Problems solved by technology

However, there are two problems with this method: 1) Special personnel need to enter the furnace to touch the tubes. During the cleaning process of the superheater, the temperature in some areas in the furnace will reach above 90°C, which is inconvenient for personnel to operate; 2) Monitoring cannot be carried out continuously, and failures cannot be found in time Tube

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