Nuclear Magnetic Flowmeter Coil Antenna Pulse Timing
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Solution Overview
Problem
Nuclear magnetic flowmeters struggle to accurately measure low crude oil content in multiphase media due to mechanical complexities and maintenance requirements in existing magnetic field manipulation methods, leading to inefficiencies and inaccuracies in flow rate measurements.
Innovation Solution
A method utilizing a coil-shaped antenna in the pre-magnetization path to generate a destruction pulse that synchronizes the magnetization influence duration across different flow velocities, ensuring uniform magnetization buildup and reducing measurement inaccuracies by adjusting the antenna's length and waiting time to match flow velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical mechanisms are used to vary the magnetic field duration, then measurement adaptability to different flow velocities is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent replaces mechanical mechanisms for varying magnetic field duration with an electromagnetic solution. A coil-shaped antenna generates destruction pulses that reset magnetization, allowing the effective magnetization duration to be controlled by pulse timing rather than mechanical movement. This eliminates moving parts while maintaining adaptability to different flow velocities.
Solution Approach 2:
The patent changes the parameter control approach from mechanical position adjustment to electromagnetic pulse timing. By controlling when destruction pulses are applied to the coil antenna, the system adjusts the effective magnetization duration without mechanical movement, enabling adaptation to varying flow conditions through electrical parameter control.
2Adaptability or versatility
If mechanical mechanisms are used to vary the magnetic field duration, then measurement adaptability to different flow velocities is improved, but maintenance requirements increase
Solution Approach 1:
The patent eliminates mechanical components by using electromagnetic destruction pulses from a coil antenna to control magnetization duration. Without moving parts, wear, and mechanical failures, maintenance requirements are significantly reduced while preserving the ability to adapt measurements to different flow velocities.
Solution Approach 2:
The system uses the existing magnetic field infrastructure to generate destruction pulses that automatically reset magnetization. The coil antenna and control electronics work together to provide self-regulating magnetization management without requiring external mechanical intervention or maintenance.
3Device complexity
If fixed magnetization duration is used, then device simplicity is maintained, but measurement precision for varying flow velocities deteriorates
Solution Approach 1:
The patent employs periodic destruction pulses from the coil antenna to reset magnetization at controlled intervals. This periodic electromagnetic action allows the system to maintain simple hardware while achieving variable effective magnetization durations by adjusting pulse frequency and timing, thereby preserving measurement precision across different flow velocities.
Solution Approach 2:
The destruction pulses are applied in advance of measurement to reset magnetization to a known state. This preliminary electromagnetic action ensures that each measurement cycle starts with consistent conditions, improving precision without requiring complex mechanical adjustment mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for precise and reliable flow rate measurements independent of flow velocity and profile, reducing maintenance needs and operational costs while enhancing measurement accuracy.
Implementation Method 1
at least one coil-shaped antenna (5) is provided in the pre-magnetization section (L VM) for generating a pulse or pulse sequence that destroys the magnetization of the medium in the direction of the magnetic field
Implementation Method 2
magnetic field generation device consisting of permanent magnets for generating a magnetic field passing through the medium via a magnetic field section LM
Implementation Method 3
In the presence of a macroscopic magnetic field, the magnetic moment vector of an atomic nucleus aligns itself parallel to the vector of the macroscopic magnetic field at the location of the nucleus. In this process, the magnetic moment vector of the nucleus precesses by the vector of the macroscopic magnetic field at the location of the nucleus. The frequency of this precession is called the Lamor frequency.
Data Source
Figure 1~2
AI summary
Described and illustrated is a nuclear magnetic flowmeter (1) for determining the flow rate of a medium flowing through a measuring tube (2), comprising a magnetic field generation device (3) consisting of permanent magnets for generating a magnetic field passing through the measuring tube (2) via a magnetic field section LM, a premagnetization section LVM located within the magnetic field section LM, and a measuring device comprising a coil-shaped antenna (5) of length L1, which also lies within the magnetic field section LM and serves as a measuring antenna. According to the invention, at least one coil-shaped antenna (5) is provided in the premagnetization section LVM for generating a pulse or pulse sequence that destroys the magnetization of the medium in the direction of the magnetic field.