Low-temperature sensor system for LNG (Liquefied Natural Gas) measurement and use method thereof

By designing an inverted trapezoidal spiral groove array and a superhydrophilic modified layer on the surface of the cryogenic sensor probe, combined with active temperature control, the measurement deviation problem caused by the Leidenfrost effect in LNG measurement was solved, achieving efficient and accurate temperature and density measurement.

CN121140960APending Publication Date: 2025-12-16CNOOC GAS & POWER GRP
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Patent Information

Application Number
CN202511335170.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-18
Publication Date
2025-12-16

AI Technical Summary

Technical Problem

Existing cryogenic sensors suffer from slow response, increased measurement deviation, and insufficient accuracy and reliability in LNG measurement due to the Leidenfrost effect.

Method used

A low-temperature sensor system was designed with a spiral groove array on the probe surface having an inverted trapezoidal cross-section and a specific tilt angle. Combined with a superhydrophilic wettability modified layer, a porous dielectric layer, and an active temperature control module, the sensor structure was optimized to suppress the Leidenfrost effect.

Benefits of technology

It significantly improves the heat exchange efficiency and measurement accuracy of the sensor, ensures reliable solid-liquid contact, enables rapid and accurate temperature and density measurement, and enhances adaptability and reliability under operating conditions.

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Abstract

The invention relates to the technical field of low-temperature fluid measurement, and discloses a low-temperature sensor system for LNG (liquefied natural gas) measurement and a use method of the low-temperature sensor system. A groove array with an inverted trapezoidal section, a specific inclination angle and spiral distribution is designed on the surface of a measurement probe, so that the generation of the Leidenfrost effect is effectively inhibited; direct and full contact between LNG and the surface of the sensor is ensured; the surface wettability modification layer and / or the porous medium layer of the groove array are combined, so that the surface gas film formation resistance of the sensor is enhanced, and the heat transfer efficiency and the vibration conduction reliability are remarkably improved; the integrated active temperature control module can intelligently adjust the surface temperature of the measuring probe to adapt to different working conditions and prevent the formation of a steam film; a porous packaging structure of the measuring probe provides a channel for steam escape and liquid permeation, and long-term stability is guaranteed; according to the invention, the temperature and density of the LNG can be rapidly, accurately and reliably measured.
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