CN-122015757-A - LNG storage tank structure health monitoring method, device, equipment, medium and product

CN122015757ACN 122015757 ACN122015757 ACN 122015757ACN-122015757-A

Abstract

The application discloses a method, a device, equipment, a medium and a product for monitoring the structural health of an LNG storage tank, and relates to the field of LNG equipment monitoring; the method comprises the steps of integrating pre-cooling period data and operation period data by adopting a unified timestamp to obtain monitoring data, obtaining strain displacement monitoring baselines, calibrating the strain displacement monitoring baselines in real time based on temperature field data and combining the shrinkage characteristics of the inner wall of an LNG storage tank to obtain pre-cooling working condition dynamic baselines, distinguishing abnormal structural displacement of structural deformation data through a three-dimensional motion coupling model based on the pre-cooling working condition dynamic baselines to obtain three-dimensional coupling data, associating strain temperature displacement parameters based on the three-dimensional coupling data, the temperature field data and the structural deformation data to obtain monitoring values, and generating health monitoring results based on the monitoring values and the pre-cooling working condition dynamic baselines. The application can improve the real-time performance and the accuracy of the structural health monitoring of the LNG storage tank.

Inventors

WU XU
WANG SHI
ZHANG CHUNYI
ZHANG DENGYU
SHI XIUSHAN

Assignees

中国特种设备检测研究院

Dates

Publication Date: 20260512
Application Date: 20260211

Claims (10)

1. A method for monitoring the structural health of an LNG storage tank, comprising: acquiring pre-cooling period data and operation period data of an LNG storage tank by adopting a layered sensing network, wherein the pre-cooling period data and the operation period data comprise temperature field data, structure deformation data and inclination angles; integrating the pre-cooling period data and the operation period data by adopting a unified time stamp to obtain monitoring data; Acquiring a strain displacement monitoring baseline, and calibrating the strain displacement monitoring baseline in real time by combining the contraction characteristic of the inner wall of the LNG storage tank based on the temperature field data to obtain a precooling working condition dynamic baseline; Based on a precooling working condition dynamic baseline, distinguishing abnormal structural displacement of the structural deformation data through a three-dimensional motion coupling model to obtain three-dimensional coupling data, wherein the abnormal structural displacement refers to data except structural deformation caused by the weight of an LNG storage tank; The strain temperature displacement parameter is related to the three-dimensional coupling data, the temperature field data and the structural deformation data to obtain a monitoring value; and generating a health monitoring result based on the monitoring value and the pre-cooling working condition dynamic baseline.
2. The LNG tank structure health monitoring method of claim 1, wherein based on the temperature field data, the strain displacement monitoring baseline is calibrated in real time in combination with the LNG tank inner wall shrinkage characteristics to obtain a pre-cooling condition dynamic baseline, comprising: Determining a strain displacement amount generated by shrinkage of the inner wall of the LNG storage tank based on a set temperature field in the pre-cooling period data, and screening out structural deformation data corresponding to the strain displacement amount to obtain compensated structural deformation data; and calibrating the strain displacement monitoring base line in real time based on the compensated structural deformation data to obtain the pre-cooling working condition dynamic base line.
3. The LNG tank structure health monitoring method according to claim 1, wherein the process of constructing the three-dimensional kinematic coupling model includes: Acquiring a circumferential rotation angle of the LNG storage tank; determining vertical differential settlement and horizontal shrinkage displacement based on the structural deformation data; And establishing a coupling relation among the vertical differential settlement, the horizontal shrinkage displacement, the circumferential rotation angle and the weight load of the LNG storage tank, and taking the coupling relation as the three-dimensional motion coupling model.
4. The LNG tank structure health monitoring method of claim 1, wherein generating health monitoring results based on the monitoring values and the pre-cooling condition dynamic baseline comprises: Determining a baseline threshold based on the pre-cooling condition dynamic baseline; Determining whether the monitored value is greater than the baseline threshold; When the monitoring value is larger than the baseline threshold value, the health monitoring result is abnormal, and abnormal monitoring information is generated based on the monitoring value; Generating a maintenance decision based on the anomaly monitoring information; and when the monitoring value is smaller than or equal to the baseline threshold value, the health monitoring result is normal.
5. The LNG tank structure health monitoring method of claim 4, wherein the baseline threshold comprises a temperature threshold and a sedimentation threshold; determining a baseline threshold based on the pre-cooling condition dynamic baseline, comprising: in a pre-cooling stage in the pre-cooling working condition dynamic baseline, setting a temperature threshold to be-165 ℃ to-160 ℃, and dynamically regulating a sedimentation threshold downwards along with temperature reduction according to a set rule by a linear function; And in the operation stage in the pre-cooling working condition dynamic baseline, the temperature threshold and the sedimentation threshold are set multiples of the temperature and the sedimentation average value 24 hours after the pre-cooling stabilizing period.
6. An LNG tank structural health monitoring device, comprising: the system comprises a layered sensing network, a storage tank and a storage tank, wherein the layered sensing network is used for collecting pre-cooling period data and operation period data of the LNG storage tank, and the pre-cooling period data and the operation period data comprise temperature field data, structure deformation data and inclination angles; the data synchronous acquisition module is used for integrating the pre-cooling period data and the operation period data by adopting a uniform time stamp to obtain monitoring data; The baseline calibration module is used for acquiring a strain displacement monitoring baseline, and based on the temperature field data, calibrating the strain displacement monitoring baseline in real time by combining the contraction characteristics of the inner wall of the LNG storage tank to obtain a precooling working condition dynamic baseline; The three-dimensional coupling module is used for distinguishing abnormal structural displacement of the structural deformation data through a three-dimensional motion coupling model based on a pre-cooling working condition dynamic baseline to obtain three-dimensional coupling data, wherein the abnormal structural displacement refers to data except structural deformation caused by the weight of the LNG storage tank; the monitoring value determining module is used for obtaining a monitoring value based on the three-dimensional coupling data, the temperature field data and the structural deformation data related strain temperature displacement parameters; And the monitoring result generation module is used for generating a health monitoring result based on the monitoring value and the pre-cooling working condition dynamic baseline.
7. The LNG tank structure health monitoring device of claim 6, wherein the hierarchical sensing network comprises: the vibrating wire strain gauge is arranged on the bottom plate of the LNG storage tank and is used for collecting sedimentation deformation of the LNG storage tank in real time; the optical fiber sensor is annularly arranged on the inner wall of the LNG storage tank and is used for collecting the vertical differential settlement level, the shrinkage displacement and the circumferential rotation angle of the LNG storage tank in real time; The distributed optical fiber temperature sensor is arranged on the inner wall of the LNG storage tank and used for collecting the temperature field data in real time; and the electric inclinometer is arranged on the outer wall of the LNG storage tank and is used for collecting the inclination angle of the LNG storage tank in real time.
8. A computer device comprising a memory, a processor and a computer program stored on the memory and capable of running on the processor, characterized in that the processor executes the computer program to implement the LNG storage tank structure health monitoring method of any of claims 1-5.
9. A computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the LNG tank structure health monitoring method of any of claims 1-5.
10. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the LNG tank structure health monitoring method according to any of claims 1-5.

Description

LNG storage tank structure health monitoring method, device, equipment, medium and product Technical Field The application relates to the field of LNG storage tank monitoring, in particular to a method, a device, equipment, a medium and a product for monitoring the structural health of an LNG storage tank. Background The health monitoring of liquefied natural gas (Liquefied Natural Gas, LNG) storage tanks is a system engineering for comprehensively utilizing sensing technology, data acquisition and intelligent analysis means to monitor and evaluate the structural state and safety index of the LNG storage tanks in real time under key working conditions. The existing monitoring system particularly focuses on two core dangerous working conditions, namely, a precooling process in the initial stage of storage tank production, a temperature sensor arranged on the wall of the storage tank is used for closely monitoring the temperature gradient to prevent material damage caused by overlarge thermal stress caused by quenching, and a high-precision sedimentation monitoring system is used for tracking the uneven sedimentation trend of the tank body in real time and early warning the structural instability risk possibly caused by the uneven sedimentation trend of the storage tank body. Through the targeted monitoring and the combination of data analysis and digital twin technology, a key decision basis can be provided for guaranteeing the structural integrity of the storage tank and long-term operation safety. However, in the prior art, in the structural health monitoring of an LNG storage tank, independent monitoring of single physical parameters is often relied on, collaborative integration of multidimensional data such as vertical settlement, horizontal displacement, temperature fields and the like is lacking, reference thresholds are fixed, and cannot be dynamically adjusted according to different working conditions such as precooling and operation, so that hysteresis or misjudgment risks exist in the identification of fine structural anomalies. Disclosure of Invention In order to solve the problems in the prior art, the application provides a method, a device, equipment, a medium and a product for monitoring the structural health of an LNG storage tank. In order to achieve the above object, the present application provides the following solutions: in a first aspect, the present application provides a method for monitoring structural health of an LNG storage tank, including: acquiring pre-cooling period data and operation period data of an LNG storage tank by adopting a layered sensing network, wherein the pre-cooling period data and the operation period data comprise temperature field data, structure deformation data and inclination angles; integrating the pre-cooling period data and the operation period data by adopting a unified time stamp to obtain monitoring data; Acquiring a strain displacement monitoring baseline, and calibrating the strain displacement monitoring baseline in real time by combining the contraction characteristic of the inner wall of the LNG storage tank based on the temperature field data to obtain a precooling working condition dynamic baseline; Based on a precooling working condition dynamic baseline, distinguishing abnormal structural displacement of the structural deformation data through a three-dimensional motion coupling model to obtain three-dimensional coupling data, wherein the abnormal structural displacement refers to data except structural deformation caused by the weight of an LNG storage tank; The strain temperature displacement parameter is related to the three-dimensional coupling data, the temperature field data and the structural deformation data to obtain a monitoring value; and generating a health monitoring result based on the monitoring value and the pre-cooling working condition dynamic baseline. In a second aspect, the present application provides an LNG storage tank structural health monitoring device, comprising: the system comprises a layered sensing network, a storage tank and a storage tank, wherein the layered sensing network is used for collecting pre-cooling period data and operation period data of the LNG storage tank, and the pre-cooling period data and the operation period data comprise temperature field data, structure deformation data and inclination angles; the data synchronous acquisition module is used for integrating the pre-cooling period data and the operation period data by adopting a uniform time stamp to obtain monitoring data; The baseline calibration module is used for acquiring a strain displacement monitoring baseline, and based on the temperature field data, calibrating the strain displacement monitoring baseline in real time by combining the contraction characteristics of the inner wall of the LNG storage tank to obtain a precooling working condition dynamic baseline; The three-dimensional coupling module is used for distinguishing abnorma