CN-121977710-A - Corrosion monitoring system under distributed industrial facility heat preservation

CN121977710ACN 121977710 ACN121977710 ACN 121977710ACN-121977710-A

Abstract

The invention discloses a corrosion monitoring system under a heat preservation layer of a distributed industrial facility, which comprises a plurality of monitoring nodes, at least one repeater and a host, wherein each monitoring node comprises a monitoring unit and a monitoring node body, each monitoring unit comprises a temperature sensitive element, a liquid water sensitive element and a sealing structure, each monitoring node body comprises a packaging shell, a signal processing circuit, a low-power-consumption wireless communication module and a miniature energy module, the signal processing circuit, the low-power-consumption wireless communication module and the miniature energy module are arranged in the packaging shell, each monitoring node body adopts a sealing integrated structure, the monitoring node body and the repeater are communicated through a low-power-consumption long-distance wireless protocol, and the repeater and the host are communicated. According to the invention, through the cooperative monitoring of the temperature and the liquid water, the early identification and the accurate early warning of the corrosion state under the heat insulation layer are realized.

Inventors

WANG WEIJIE
MIAO LEI
XU HUI
ZHAO QIFENG
LIU BO
Liu Aomen
HAN JICHENG
YE YI
SUN JIXING
ZHANG LI

Assignees

中海油常州涂料化工研究院有限公司
中海油能源发展股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260126

Claims (10)

1. The corrosion monitoring system under the insulating layer of the distributed industrial facility is characterized by comprising a plurality of monitoring nodes, at least one repeater and a host, wherein the monitoring nodes comprise monitoring units and monitoring node bodies, the monitoring units comprise temperature sensitive elements (1), liquid water sensitive elements (2) and sealing structures, the monitoring node bodies comprise packaging shells, signal processing circuits, low-power-consumption wireless communication modules and miniature energy modules, the signal processing circuits, the low-power-consumption wireless communication modules and the miniature energy modules are arranged in the packaging shells, the monitoring node bodies are of a sealed integrated structure, the monitoring node bodies and the repeater are in communication through a low-power-consumption long-distance wireless protocol, and the repeater is in communication with the host.
2. The system for monitoring corrosion under a thermal insulation layer of a distributed industrial facility of claim 1, wherein the low power consumption long range wireless protocol is any one of LoRa, loRaWAN, NB-IoT or Sub-GHz, and the repeater and the host communicate via 4G, 5G, ethernet or Wi-Fi.
3. The distributed industrial facility insulation layer corrosion monitoring system according to claim 1, wherein the temperature sensitive element (1) and the liquid water sensitive element (2) are connected with the monitoring node body through flexible leads (3).
4. The distributed industrial facility insulation layer corrosion monitoring system according to claim 3, wherein the temperature sensitive element (1) is any one of a thermal resistance temperature sensor, a thermistor temperature sensor, a thermocouple sensor or an optical fiber temperature sensor, the temperature sensitive element (1) is arranged on the outer wall of equipment or a pipeline, and the sensitive surface of the temperature sensitive element (1) is directly adhered to the surface of the metal outer wall of the equipment or the pipeline through a heat conducting patch; The liquid water sensitive element (2) adopts a conductivity type, capacitance type or optical fiber type detection principle, the liquid water sensitive element (2) is arranged in an area which is easy to accumulate water at the bottom of the heat preservation layer, and the sensitive surface of the liquid water sensitive element (2) faces to the surface of the metal outer wall of the equipment or the pipeline or the inside of the heat preservation layer; the flexible lead (3) is of a composite structure of stranded conductors and a flexible shielding net, and is sleeved with a high-temperature-resistant corrugated protective tube.
5. The distributed industrial facility insulation undersea corrosion monitoring system according to claim 1, wherein the sealing structure comprises a sleeve (4) and a disc (5) which are coaxially arranged, one end of the flexible lead (3) is connected with the sensitive element, the other end of the flexible lead (3) penetrates into the sleeve (4) through the disc (5), and the flexible lead (3) and the sleeve (4) are in preset sealing connection at an outlet end. The monitoring node body is embedded into the outer surface of the heat-insulating layer and is fixed through a self-locking buckle structure, and the outer surface of the monitoring node body is basically flush with the outer surface of the heat-insulating layer.
6. The system for monitoring corrosion under a heat insulation layer of a distributed industrial facility according to claim 5, wherein the end of the flexible lead (3) far away from the disc (5) is provided with a quick-release connector.
7. The system for monitoring corrosion under the insulation layer of the distributed industrial facility, which is disclosed in claim 1, is characterized in that the disc (5) is anchored on the inner side of the insulation layer, an external thread is formed on the outer wall of one end, far away from the disc (5), of the sleeve (4), the sleeve (4) is vertically downwards arranged, the external thread extends out of the insulation layer, a round gasket and a nut are sleeved outside the external thread, the outer wall of the insulation layer is tightly pressed by screwing the nut, and weather-resistant sealant is coated at a gap between the sleeve (4) and the insulation layer.
8. The system for monitoring corrosion under insulation of a distributed industrial facility as claimed in claim 5, wherein the sleeve (4) is arranged in a lap joint area of two insulation layers and a protective layer.
9. The system of claim 1, wherein the enclosure of the monitoring node body is made of a high temperature resistant polyether ether ketone or a fluorinated polymer, and the protection level is not lower than IP67.
10. The system for monitoring corrosion under a thermal insulation layer of a distributed industrial facility according to claim 1, wherein the signal processing circuit adopts a multi-channel differential acquisition structure, the low-power wireless communication module communicates with the repeater through LoRa, loRaWAN, NB-IoT or Sub-GHz wireless protocols, and the micro-energy module supplies power to the signal processing circuit and the low-power wireless communication module.

Description

Corrosion monitoring system under distributed industrial facility heat preservation Technical Field The invention belongs to the technical field of equipment corrosion monitoring and protection, and particularly relates to a corrosion monitoring system under a distributed industrial facility heat insulation layer. Background Corrosion under insulation is one of the most common and most severe corrosion types in petrochemical, chemical, electrical and marine engineering equipment. In the running process of the equipment and the pipeline, the outer wall is generally coated with an insulating layer in order to reduce heat loss or prevent dew condensation. In a long-term service environment, rainwater, condensed water or process leakage liquid is easy to permeate into the heat insulation layer along weak parts such as splice seams, a local stagnant water area is formed on the metal surface, oxygen concentration corrosion, crevice corrosion or stress corrosion cracking is caused, and equipment failure and even medium leakage are finally caused. Because the corrosion process is shielded by the heat preservation layer, the corrosion process is difficult to discover in early stage, and is often perceived when obvious leakage or overhaul occurs, so that the high maintenance cost and the high safety risk are caused. The detection means for corrosion under the heat preservation layer at present mainly comprise infrared thermal imaging, ultrasonic detection, radio frequency electromagnetic detection, electrochemical monitoring, distributed optical fiber sensing and the like. The method can realize higher precision in experiments or specific scenes, but generally has the problems of high equipment cost, complex system integration, long detection period, difficult installation and maintenance and the like, and is difficult to realize long-term continuous layout in a large-scale industrial field. From an engineering economy perspective, the core problem of CUI monitoring is not a single point measurement accuracy deficiency, but rather a "contradiction between monitoring coverage and cost". The number of the heat preservation pipelines in the industrial device is huge, the distribution is complex, and if a high-cost sensing system is adopted to realize full coverage, the high investment and maintenance cost can be caused. Therefore, there is a need to develop a distributed system with simple structure, controllable cost, and capability of implementing dual-parameter collaborative monitoring of temperature and liquid water without damaging the integrity of the insulation layer. Disclosure of Invention The invention provides a distributed type corrosion monitoring system under an industrial facility heat preservation layer, which aims to solve the problems existing in the prior art. The invention is realized by the following technical scheme: The monitoring node body comprises a packaging shell, a signal processing circuit, a low-power consumption wireless communication module and a miniature energy module which are arranged in the packaging shell, the monitoring node body adopts a sealing integrated structure, the monitoring node body and the relay are communicated through a low-power consumption long-distance wireless protocol, and the relay is communicated with the host. In the technical scheme, the low-power consumption long-distance wireless protocol is any one of LoRa, loRaWAN, NB-IoT or Sub-GHz, and the repeater and the host realize communication through 4G, 5G, ethernet or Wi-Fi. In the technical scheme, the temperature sensing element and the liquid water sensing element are connected with the monitoring node body through flexible leads. In the technical scheme, the temperature sensitive element adopts any one of a thermal resistance temperature sensor, a thermistor temperature sensor, a thermocouple sensor or an optical fiber temperature sensor, is arranged on the outer wall of the equipment or the pipeline, and the sensitive surface of the temperature sensitive element is directly adhered to the surface of the metal outer wall of the equipment or the pipeline through a heat conduction patch; the liquid water sensitive element adopts a conductivity type, capacitance type or optical fiber type detection principle, is arranged in a region which is easy to accumulate water at the bottom of the heat preservation layer, and has a sensitive surface facing to the surface of the metal outer wall of the equipment or the pipeline or the inside of the heat preservation layer; the flexible lead is of a composite structure of stranded conductors and a flexible shielding net, and is sleeved with a high-temperature-resistant corrugated protective tube. In the above technical scheme, seal structure includes coaxial sleeve pipe and disc that sets up, and sensitive element is connected to flexible lead one end, and the other end passes through the disc and penetrates in the sleeve pipe, and flexible lead presets sealing connection