CN-122016085-A - Special-shaped clung type temperature sensing system for monitoring heat release of pipeline leakage

CN122016085ACN 122016085 ACN122016085 ACN 122016085ACN-122016085-A

Abstract

The invention relates to the technical field of temperature measurement, and discloses a special-shaped close-fitting type temperature sensing system for monitoring leakage and heat release of a pipeline, which comprises the following components: the system utilizes the flexible thermal isolation module to establish a heat transfer barrier on the wall surface of the special-shaped pipe fitting to be tested, temperature difference data are acquired through the first temperature field acquisition module and the second temperature field acquisition module, the temperature difference is corrected by the heat flow analysis module according to wall thickness evolution parameters and curvature distribution data, a normal heat flux field is generated through mapping, vector polar inversion components are extracted, heat flow analysis is realized through geometric feature constraint, heat transfer nonlinear interference generated by the special-shaped structure is eliminated, and the reliability of the system for capturing weak heat release features under complex working conditions is enhanced.

Inventors

ZHU LINGQING
WANG QIANG
ZHU YUWEI
JIANG YANGLONG
YANG JINMEI
ZENG CHENGLONG
YOU ZHIWEN
LIN PANHUI

Assignees

中稀金龙(长汀)稀土有限公司

Dates

Publication Date: 20260512
Application Date: 20260402

Claims (9)

1. A profiled snug temperature sensing system for monitoring heat release from a pipe leak, comprising: The first temperature field acquisition module is used for acquiring first temperature field distribution data of the wall surface of the measured special-shaped pipe fitting; The flexible thermal isolation module is attached to one side of the first temperature field acquisition module, which is away from the measured special-shaped pipe fitting, and is used for establishing a heat transfer barrier defined by nominal thermal resistance in the normal direction; The second temperature field acquisition module is attached to one side, far away from the first temperature field acquisition module, of the flexible thermal isolation module and is used for acquiring second temperature field distribution data of the outer surface of the flexible thermal isolation module; The device comprises a first temperature field acquisition module, a second temperature field acquisition module, a heat flow analysis module, a normal heat flux field generation module, a heat flow analysis module and a leakage state early warning signal, wherein the first temperature field acquisition module is connected with the first temperature field acquisition module and the second temperature field acquisition module respectively, the heat flow analysis module stores wall thickness evolution parameters and curvature space distribution data representing the original geometric characteristics of a measured special-shaped pipe fitting, the heat flow analysis module carries out nonlinear weighted correction on the temperature difference of the first temperature field distribution data and the second temperature field distribution data according to the wall thickness evolution parameters and the curvature space distribution data, the normal heat flux field of the wall surface of the measured special-shaped pipe fitting is calculated and generated, and the heat flow analysis module extracts vector polar inversion components in the normal heat flux field and combines with transverse space temperature gradients in the first temperature field distribution data to output the leakage state early warning signal of the measured special-shaped pipe fitting.
2. The special-shaped close-fitting type temperature sensing system for monitoring the heat release of pipeline leakage is characterized by further comprising a thermal resistance online calibration module, wherein the thermal resistance online calibration module obtains a reference temperature difference of adjacent temperature measuring nodes under a steady-state working condition and determines a material aging attenuation factor by using the offset of the reference temperature difference along with the running time, and the heat flow analysis module dynamically compensates the nominal thermal resistance based on the material aging attenuation factor so as to offset analysis deviation of the flexible thermal isolation module caused by physical degradation.
3. The special-shaped clung type temperature sensing system for monitoring heat release of pipeline leakage according to claim 1, further comprising a space geometric mapping module, wherein the space geometric mapping module stores a three-dimensional digital model of the special-shaped pipe fitting to be tested, and the space geometric mapping module maps two-dimensional topological coordinates of the first temperature field acquisition module and the second temperature field acquisition module to a three-dimensional coordinate system by utilizing the three-dimensional digital model so as to determine wall thickness evolution parameters corresponding to the three-dimensional coordinate system.
4. The profiled cling type temperature sensing system for monitoring leakage heat release of a pipeline according to claim 1, wherein the heat flow analysis module captures heat release disturbance based on the time change rate of the first temperature field distribution data, and when the time change rate exceeds 0.5 ℃ per second, the sampling frequency of the first temperature field acquisition module and the second temperature field acquisition module is switched from 1Hz to 50Hz.
5. The special-shaped clung type temperature sensing system for monitoring heat release of pipeline leakage is characterized in that the first temperature field acquisition module and the second temperature field acquisition module comprise thermistor lattices packaged in flexible printed circuit base materials, and the flexible printed circuit base materials are coated on the surfaces of the flexible thermal isolation modules and are in conformal fit with an elbow or a tee joint of a special-shaped pipe fitting to be tested.
6. The special-shaped close-fitting type temperature sensing system for monitoring heat release of pipeline leakage according to claim 1, wherein the system further comprises an environment convection compensation module, the environment convection compensation module is connected with a wind speed sensing unit, the environment convection compensation module determines convection heat exchange intensity of the surface of the second temperature field acquisition module based on local flow field data provided by the wind speed sensing unit, and background noise opposite flushing is conducted on second temperature field distribution data by utilizing the convection heat exchange intensity.
7. The special-shaped close-fitting type temperature sensing system for monitoring heat release of pipeline leakage according to claim 1, wherein the heat flow analysis module establishes a transverse temperature difference distribution matrix based on the first temperature field distribution data, and generates a medium leakage alarm signal when a normal heat flux field is reversed in direction away from a pipeline wall and the transverse temperature difference distribution matrix shows radial characteristics of attenuation from a local temperature rising point to the periphery.
8. The system of claim 1, further comprising a power consumption scheduling module for monitoring the heat release of the pipeline leakage, wherein the fluctuation value of the normal heat flux field is continuously lower than that of the normal heat flux field And when the temperature sensor is in a low sampling duty ratio monitoring state, the power consumption scheduling module enables the first temperature field acquisition module and the second temperature field acquisition module to maintain the low sampling duty ratio monitoring state.
9. The special-shaped clung type temperature sensing system for monitoring heat release of pipeline leakage is characterized in that a fastening strain sensing module is distributed at a contact interface between a first temperature field acquisition module and a tested special-shaped pipe fitting, an interface contact thermal resistance of the contact interface is calculated by a heat flow analysis module based on a real-time pressure value provided by the fastening strain sensing module, and an analysis result of normal heat flux is subjected to amplitude compensation by the aid of the interface contact thermal resistance.

Description

Special-shaped clung type temperature sensing system for monitoring heat release of pipeline leakage Technical Field The invention relates to a special-shaped close-fitting type temperature sensing system for monitoring heat release of pipeline leakage, and belongs to the technical field of temperature measurement. Background At present, in the maintenance work of petrochemical industry and large-scale energy pipe network, the leakage monitoring to special-shaped connection parts such as flange, tee bend and elbow belongs to the key link of guaranteeing system operation safety, and at present, such monitoring mainly adopts the temperature sensing subassembly that laminating pipe wall was deployed, realizes the early warning through catching the temperature rise signal that the medium physical property changes produced, and this kind of mode based on absolute difference in temperature of contact temperature sensing subassembly monitoring possesses basic using value in the industrial scene of straight pipeline section. However, when the monitoring target is a special-shaped pipe fitting, the complex surface topological structure of the special-shaped pipe fitting enables the temperature sensing assembly to generate unevenly distributed air gaps in the bonding process, the gaps form uncontrollable contact thermal resistance between the sensor and the surface to be measured, and because the pipe fitting is usually exposed in an open convective heat exchange environment, unordered fluctuation of an environmental wind field can continuously take away heat flux on the pipe wall surface, so that an original signal acquired by the temperature sensing assembly becomes a mixed superposition state of pipe wall heat conduction, environmental side heat dissipation and medium bottom temperature fluctuation, a weak temperature rise signal in the early stage of leakage is extremely easy to be covered by background thermal noise, a real leakage characteristic cannot be stripped from a single temperature amplitude by a system, the special-shaped pipe fitting is limited in terms of hardware bonding, and the thermal field analysis logic and the environmental interference decoupling level are insufficient, for example, the Chinese patent application with publication number of CN112378538A discloses an ultralow temperature thermometer installation device, which improves contact thermal resistance by matching a heat conduction component with the brazing shape of the outer wall of a curved pipeline, the scheme belongs to a static physical compensation means based on the fitting of an ideal geometric surface, relies on rigid matching of the heat conduction component and the processing dimension of the outer wall of the pipeline, in actual industrial working conditions, a special-shaped pipe fitting is influenced by stress deformation, material aging and installation disturbance, a preset heat conduction path generates uncontrollable thermal resistance drift, the prior art is not designed for the non-uniform evolution of the wall thickness of the special-shaped pipe fitting and the thermal power mechanism of the bottom layer of the environmental convection fluctuation, only realizes point temperature transfer, cannot reconstruct a normal heat flux vector field perpendicular to the pipe wall under complex curvature topology, faces the multi-source thermal disturbance interweaving dynamic evolution scene inside and outside the pipeline, is difficult to separate out weak local heat release characteristics from high-frequency environmental noise, if the performance is optimized by improving the deployment density of the temperature sensing nodes or the physical resolution of the temperature sensing components, the system still faces the problem of analysis distortion caused by lack of thermal resistance space distribution information, the complexity of the original heat transfer path is determined by the thickness gradient and curvature change of the special-shaped piece, and the two-dimensional plane calculation logic which is separated from the three-dimensional geometric constraint cannot accurately restore the heat flow vector vertical to the pipe wall, so that the system generates false alarm when the medium is normally regulated, and the false alarm is generated when the real small-aperture leakage occurs. Therefore, how to combine the three-dimensional space topological feature of the pipe fitting and realize the dynamic decoupling of the environmental thermal interference so as to realize the high-fidelity reconstruction of the weak heat release signal under the non-ideal heat transfer boundary becomes the technical problem to be solved by the invention. Disclosure of Invention In order to solve the problems in the background technology, the technical scheme of the invention is as follows, a special-shaped close-fitting type temperature sensing system for monitoring heat release of pipeline leakage comprises: The first temperatur