Fault diagnosis method for heat exchange unit

Abstract

The invention provides a fault diagnosis method for a heat exchange unit. The fault diagnosis method comprises the following steps: S1) collection of fault information; S2) extracting related vibration signals to form an observation data set; S3) identifying time sequence relationship of contact stress between components of the heat exchange unit, and obtaining a vibration separation vector of each component from a combination set of the time sequence relationship according to a certain mapping reconstruction method; S4) carrying out wavelet packet noise reduction filtering on signals obtainedthrough continuous mapping to obtain enhanced feature signals; and S5) carrying out wavelet packet energy spectrum identification on the vibration signals processed in the step S4) to identify different fault types. According to the embodiment of the invention, the problem that effective and sufficient feature data cannot be obtained through an existing diagnosis method is solved through a non-contact laser displacement sensor; effective detection and isolation of the fault are realized in the early stage of the fault; and wavelet packet energy spectrum identification can accurately locate the fault part.

Description

technical field [0001] The present application relates to the technical field of equipment monitoring and fault diagnosis, in particular to a fault diagnosis method applied to heat exchange units. Background technique [0002] The heat exchange unit is composed of a heat exchanger, a temperature control valve group, a drain valve group (when the heat medium is steam), a circulating pump, an electric control cabinet, a base, pipelines, valves, instruments, etc., and can be equipped with expansion tanks, water Processing equipment, water pump frequency conversion control, temperature control valve, remote communication control, etc., thus forming a complete heat exchange station. The heat exchange unit has a standardized and modular design, complete configuration, easy installation, high efficiency and energy saving. The heat exchange unit has the advantages of compact structure, reliable operation, simple and intuitive operation, etc., and is the first choice for high-effici...

AI Technical Summary

Problems solved by technology

[0004] This application provides a fault diagnosis method applied to heat exchange units to solve the problems in the prior art that cannot obtain effective and sufficient characteristic data; cannot realize effective detection and isolation of early faults, etc.