Krohne Ag

Marco Leendert Zoeteweij

Cornelis Johannes Hogendoorn

Rutger Reinout Tromp

Olaf Jean Paul Bousché

Lucas Matias Ceferino Cerioni

Jan Teunis Aart Pors

Olaf Jean Bousche

John Justin Freeman

Matthias Appel

Ariël De Graaf

Jan-Willem Ramondt

Cornelius Johannes Hogendoorn

Jan Teunis Pors

Olaf Jean Paul BouschÉ

A method for operating a flowmeter for determining the flow of a multiphase medium flowing through a measuring tube using a first and a second measuring device, one of which operates on a tomographic measuring principle and one of which uses a measuring principle based on nuclear magnetic resonance. The first measuring device operates in a different manner from the second measuring device, e.g., using a measuring device operating on the measuring principle of pre-magnetization contrast measurement and having a pre-magnetization section with a constant magnetic field. The magnetic field has at least one component perpendicular to the direction of flow of the multi-phase medium and is generated by using magnetic field generating elements, which are arranged around the measuring tube. Additionally, an assembly for exciting nuclear spin by a RF excitation pulse or a RF excitation pulse sequence is part of the measuring device.

Flowmeter with a measuring device implementing a tomographic measuring principle

A method for operating a nuclear magnetic flowmeter for determining the flow of a multi-phase medium flowing through a measuring tube that is suitable for media exhibiting 'phase slip' with which the characterization of the gaseous phase is simplified, is achieved by a pulse spoiling the magnetization at least in the direction of the magnetic field or a pulse sequence spoiling the magnetization in the direction of the magnetic field being emitted by a coil-shaped antenna, particularly in combination with dephasing gradients, and then, after a waiting time t, a nuclear magnetic measurement is carried out in that the medium is excited with excitation pulses by the coil-shaped antenna and the measuring signals generated by the excitation in the medium are detected.

Method for operating a nuclear magnetic flowmeter

A method for operating a nuclear-magnetic flowmeter in which, when determining a velocity of the medium through a measuring tube, the dependency on properties or the state of a medium is at least reduced. The method exciting a first volume of the magnetized medium flowing at a first velocity within a first measuring section to nuclear-magnetic resonances and a first signal sequence is formed characterizing the nuclear-magnetic resonances of the medium in the first volume, and then, exciting a second volume of the magnetized medium flowing at a second velocity within the first measuring section is excited to nuclear-magnetic resonances and a second signal sequence is formed characterizing the nuclear-magnetic resonances of the medium in the second volume. A quotient sequence is determined from each of the first and second signal sequences, and the first velocity and/or the second velocity is/are determined using the quotient sequence.

Method for operating a nuclear-magnetic flowmeter and nuclear magnetic flowmeter

A method for operating a nuclear magnetic flowmeter for determining the flow of a slug flow medium flowing through a measuring tube, with which 'tuning' parameters and 'matching' parameters are set for a slug zone a film zone, reflected power is measured over time. If the reflected power in a system set for slug zone is low for the slug zone and high for the film zone and if the reflected power in a system set for film zone is low for the film zone and high for the slug zone, relative dwell time of the slug zone and the film zone in the RF coil and the relative frequency of the slug zones and film zones in the flowing medium are determined using the reflected power with a jump in the value of the reflected power from a high value to a lower value used to trigger measurement initiation.

A method for measuring the flow rate of a multi-phase medium flowing through a measuring tube using a nuclear magnetic resonance flow meter can be used to measure the flow rate of a multi-phase medium in a simplified manner. For this purpose, a measuring device is used which implements, at the end of each pre-magnetization path, 2D tomography in the measurement tube cross-sectional plane with stratification in the z direction; the measurement tube cross-sectional plane is subdivided into layers that are thin compared to the measurement tube diameter; nuclear magnetic resonance measurements are carried out in every layer to determine measurement signals, using pre-magnetization paths of different lengths; the flow rates are measured in every layer based on the measurement signals; and the time is determined from the signal ratios of the amplitudes of the measurement signals in every layer.

Method for operating a nuclear magnetic flowmeter and nuclear magnetic flowmeter

A nuclear magnetic flowmeter () for determining the flow of a medium flowing through a measuring tube () having a magnetic field generator (), a measuring unit () and an antennae unit () with an antenna (). wherein the antennae unit () has at least one further antenna (), that is designed as a coil and is designed for transmitting the excitation signal to the magnetized medium () and for detecting the measuring signal over a further measuring section () aligned parallel to the longitudinal axis () of the measuring tube and located in the magnetic field path (), and the measuring section () and the further measuring section () are different.

Nuclear magnetic flowmeter and method for operating nuclear magnetic flowmeters

A flowmeter for determining the flow of a multi-phase medium through a measuring tube has a first and a second measuring device, one of which operates on a tomographic measuring principle and one of uses a measuring principle based on nuclear magnetic resonance. The first measuring device operates in a different manner from the second measuring device, e.g., using a measuring device operating on the measuring principle of pre-magnetization contrast measurement and having a pre-magnetization section with a constant magnetic field. The magnetic field has at least one component perpendicular to the direction of flow of the multi-phase medium and is generated by using magnetic field generating elements, which are arranged around the measuring tube. Additionally, an assembly for exciting nuclear spin by a RF excitation pulse or a RF excitation pulse sequence is part of the measuring device.

A nuclear magnetic flowmeter () for determining the flow of a medium flowing through a measuring tube (), having a magnetic field generator () having permanent magnets for generating a magnetic field interfusing the medium over a magnetic field section L, having a pre-magnetization section Llocated within the magnetic field section Land having a measuring device also located in the magnetic field section Lincluding a coil-shaped antenna () with the length Lserving as a measuring antenna. At least one coil-shaped antenna () is provided in the pre-magnetization section Lfor generating a pulse or pulse sequence spoiling the magnetization of the medium in the direction of the magnetic field.

Nuclear magnetic flowmeter and method for operating a nuclear magnetic flowmeter

A magnetization device with a magnetic field which is generated by permanent magnets for variable magnetization of a medium flowing through a tube over a magnetization distance along the longitudinal axis of the tube. The magnetization device improves the quality of the results relative to known nuclear magnetic resonance measurement and analysis methods in that the magnetic field in the medium has a single direction over the magnetization distance.

Nuclear magnetic flowmeter

A nuclear magnetic flowmeter with a measuring tube through which a multiphase medium can flow and which can be connected to an inlet tube which is located in the flow direction of the medium upstream of the measuring tube and to an outlet tube which is located in the flow direction downstream of the measuring tube. The nuclear magnetic flowmeter is, first of all, characterized essentially in that a medium bypass is assigned to the measuring tube, that the medium bypass includes a bypass tube, an inlet valve and/or an outlet valve and that, for a calibration operation, the bypass tube, on the one hand, can be connected to the inlet tube, and on the other hand, to the outlet tube, specifically via the inlet valve, via the outlet valve or via the inlet valve and via the outlet valve.

A magnetization device for permeation of a multiphase fluid flowing through a measurement tube of a nuclear magnetic flow meter with a magnetic field which is homogenous at least in one plane, with a plurality of permanent magnets for generation of a magnetic field and with a carrier, the carrier having at least one magnet receiver, each magnet receiver accommodating at least one of the permanent magnets, the shape of the magnet receivers and of the permanent magnets allowing movement of the permanent magnets in the magnet receivers only in one direction and the permanent magnets being by the magnet receivers formed by hollow profiles. The hollow profile magnet receivers can be receiving tubes for the magnets that can be turned around their longitudinal axis or the profiles can have a rotatable adapter for the magnets so that a first shimming action can be achieved with the profiles.

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Hendrik-Ido-Ambach, Netherlands

Marco Leendert Zoeteweij