JPH03103748A - Instrument and method for measuring viscosity of fluid - Google Patents

Abstract

PURPOSE:To measure the viscosity of fluid under high-temp. and high-pressure conditions by putting fluid for viscosity measurement in a measuring vessel made of a metal, heating and stirring the fluid and measuring the viscosity of the fluid from the relative positional deviation of a driving shaft with a magnet and a load shaft with a magnet. CONSTITUTION:The solid which is liquid at ordinary temp. or is fluidized by heating the same up to a specified temp. is inserted into the vessel 11 for viscosity measurement provided in a hermetic vessel V made of a nonmagnetic metal and the viscosity thereof is measured by operating a stirrer 10 and a heating furnace 12. The stirrer 10 is rotated by an external magnetic rotor 2 existing in the outside part of the hermetic vessel V to apply rotating torque to the driving shaft 4 with a magnet, the torsion shaft 6 and the load shaft 6 with a magnet, thereby rotating these shafts. The torsion quantity of the torsion shaft 6 at various temps. is detected by magnetic detectors 7, 8 from the outside of the hermetic vessel V. The phase difference of the detected values is converted to the viscosity of the fluid by a microcomputer 14.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an apparatus and method for measuring the viscosity of a fluid under conditions of a high-temperature, high-pressure inert gas atmosphere or a high-pressure flammable gas atmosphere. .

[Prior Art] In industries where fluids are handled under high pressure or vacuum conditions and under variable temperature conditions, viscosity measurements under these conditions are essential for plant design. For example, polymer and petrochemical plant design,
In recent years, viscosity measurement is also required in coal liquefaction plant design. However, in reality, it is difficult to measure viscosity under plant operating conditions, and methods such as extrapolating measurement results at normal pressure 1 have been used.

Recently, a method of installing a viscometer in an autoclave to measure viscosity under high pressure (Chiba et al.; Journal of Japan Fuel Association; Eclipse (4), p. 26)
5, 1986). However, with this method, it is necessary to provide a window to visually observe the measurement or a lead wire hole to take the measurement signal out of the container, which is especially important when performing measurements in an atmosphere of flammable gas such as hydrogen. is not sufficient for safety.

In addition, as a method for detecting viscosity, the liquid is immersed in a viscosity measurement liquid and the rotational speed of a rotor is varied in order to keep the torque applied to the rotor constant. However, with this method, it is impossible to maintain constant stirring conditions in the measurement system, and in this regard, there is a problem in uniformly stirring the reaction system, especially when measuring the viscosity of a system involving a chemical reaction.

[Problems to be Solved by the Invention] When determining the viscosity of a fluid in a high temperature and high pressure state, the safe L atmosphere must be an inert gas (N2.
combustible gas (1!2, CIL.e, etc.).
Even if the container is for Co only, the container in which the viscosity is to be measured must be kept tightly closed. Therefore, in order to measure the viscosity of a fluid under conditions of high temperature and high pressure, it is necessary to perform the measurement in a pressure-resistant container, but the viscosity detection mechanism used when measuring viscosity under normal pressure is It is practically impossible to put it in a limited high-pressure container.

It is an object of the present invention to solve this problem and provide a device and method for measuring fluid viscosity under high temperature and high pressure conditions.

[A Thousand Steps to Solve Three Problems] The present invention comprises a metal measurement container containing a fluid for viscosity measurement, a viscosity measurement system, and a non-magnetic airtight container housing the measurement container and the viscosity measurement system. , the viscosity measurement system has a structure in which an internal magnetic rotor, a drive shaft, a torsion shaft, a load shaft, and a stirrer immersed in the measurement container are directly connected from the top directly below the inner wall of the closed container; It has a structure in which magnets are installed on the drive shaft and the load shaft, and further includes an external magnetic rotor and a motor for driving the external magnetic rotor that is installed outside the sealed container at a position facing the internal rotor, and the drive shaft and the load shaft. Two magnetic detectors that detect the magnetism of the magnet installed on the load shaft, a recorder that records the current generated from the magnetic detector, and a temperature measurement unit installed in the side part of the sealed container. measuring the temperature measured by the bu and the l' current resulting from the magnetic detection gain at regular intervals;
It consists of a measurement system that sends measurement results to a CRT and printer and records them on a magnetic medium, and a heating furnace that can control the measurement container to a constant temperature from the outside of the sealed container. This is a fluid viscosity measurement device characterized by the following: A fluid at room temperature or a solid that becomes fluidized by heating to a certain temperature is placed in a viscosity measurement container placed in a non-magnetic metal closed container. In measuring the viscosity of the fluid by rotating the fluid with a stirrer,
A drive shaft, a torsion shaft, and a magnet are installed in the stirrer at a position opposite to the external magnetic rotor inside the hermetic container by rotating an external magnetic rotor located outside the hermetic container. A rotational torque is applied to an internal magnetic rotor connected by a load shaft installed with the rotor, and the torsion of the torsion shaft at various temperatures is detected by two magnetic detectors from the outside of the sealed container, This is a fluid viscosity measuring method characterized by determining the viscosity based on this detected value.

[Effect] The details of the present invention will be explained below using the following illustrations.

FIG. 1 shows a schematic diagram of an apparatus according to the present invention.

After putting a substance that is liquid at room temperature or solid at room temperature and has the property of melting when heated into a 1 liter metal measuring container, use a stirrer IO equipped with stirring blades with sufficient function to stir the fluid.
Set. The stirrer lO is connected to the load shaft 6. A magnet 8' is installed on the load shaft 6, and is connected to the drive shaft 4 with a magnet 7' via the torsion shaft 5. An internal magnetic rotor 3 is connected to the magnetized drive shaft 4 and is rotated by an external magnetic rotor 2 driven by the drive motor 1 . When the drive shaft 4 with a magnet rotates, the load shaft 6 with a magnet rotates, and a torque generated by the viscosity of the fluid is applied to the load shaft 6 with a magnet, and this torque causes twisting of the torsion shaft 5, resulting in A deviation occurs in the relative positions of the magnet-equipped drive shaft 4 and the magnet-equipped load shaft 6. The viscosity of the fluid is measured from this deviation.

In the present invention, the measurement volume "Xi I 1" and the viscosity measurement system above it are housed in a non-magnetic metal closed container (pressure volume 8) V.

The magnets 7' and 8' attached to the magnet A-1 drive shaft 4 and the magnet-equipped load shaft 6 are oriented at 180 degrees to each other on the shaft circumference.
Alternatively, they are installed at a constant angle such as 90°. The numbers of magnets 7' and 8' attached to the sliding shaft 4 with magnet Zi and the load shaft 6 with magnet are the same, and adjacent magnets must have opposite polarities. Even if the strength of the magnetic field is attenuated by the pressure vessel V made of Kinkuku that separates the magnets 7', 8' and the magnetic detector 7.8, it still causes an induced electromotive force in the magnetic detector and can be recorded in the recorder. It is necessary to have a magnetic field strong enough to have a certain strength. Also,
It is necessary that all magnets have the same degree of strength.

The magnetic detectors 7 and 8 are induction coils having a magnetic core and a conductive wire wound around them, and when placed in a fluctuating magnetic field, generate an induced electromotive force depending on the strength of the magnetic field.

When magnets with the same strength are installed on the drive shaft 4 with magnet and the load shaft 6-H with magnet in the above positional relationship,
Currents due to induced electromotive force generated in the induction coils of the magnetic detectors 7 and 8 due to the four rotation of both magnets are both observed by the phase detection unit 9 as a sine wave.

Among these, the rotational speed of the drive shaft 4 can be determined from the sine wave generated by the magnetic detector 7, and the rotational speed and rotational speed of the zero load shaft 6 and the stirrer In can be determined from the sine wave generated by the magnetic detector 8. Furthermore, since the phase difference between the respective twisted chord waves of the magnetic detector 7 and the magnetic detector 8 has a certain relationship with the viscosity of the fluid that causes twisting in the twisting sleeve 5, there is a relationship between this phase difference and the viscosity of the liquid. If it is determined using a liquid that serves as a viscosity standard, it can be converted into the viscosity value of the measured fluid from the phase difference between the sine waves generated from the magnetic detectors 7 and 8, respectively.

Converting the phase difference outputted by the phase detector 9 into the viscosity of the fluid; The microcomputer 14 performs output to and records onto the magnetic medium.
It is done by

In addition, this device 1d can measure the viscosity of a fluid under heating conditions from room temperature to the heat-resistant temperature of the measurement container II by installing the measurement container II in the heating furnace 12. It is possible to measure the viscosity of the fluid under empty conditions or pressurized conditions up to the LE pressure of the measurement container 11 using inert gas or flammable gas. Note that l3 is the temperature Measurement number 15 is a temperature controller, and 16 is a thermometer provided on the outer wall of the sealed volume.

As the material of the measurement container 11, it is necessary to use a non-magnetic, high heat resistant, and high strength metal due to its magnetic detection ability, heat resistance, and pressure resistance.

From this point of view, SUS is selected as the material for the measurement container 11.
316 is used.

[Example] Fig. 2 shows the results of measuring the viscosity of coal slurry using the equipment shown in Fig. 1. Coal pulverized to a size of +00 mesh or less was mixed with a solvent in which Taleosote nb and Anthraceneura were mixed at a ratio of 1:1. These are the results of measuring viscosity while varying the concentration of coal from O to 50%.

Measurements were made at varying temperatures up to 80°C. This measurement is under normal pressure. FIG. 3 shows the results of viscosity measurement at a temperature of 450°C and a pressure of 112°C. The coal concentration in the coal slurry is 40%.

[Effects of the Invention] As a result of the present invention adopting an apparatus and method capable of measuring the viscosity of a fluid in a non-contact state, it is possible to measure the viscosity of a fluid in a high-temperature, high-pressure pipe, and this invention is useful for the movement of fluid in piping in a plant. This will enable Ikawa to make quantitative decisions, which will have an extremely large effect on the T industry.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of this device, Figures 2 and 3 are the results of measuring the viscosity of coal slurry, Figure 2 is the room gas under normal pressure, and Figure 3 is nitrogen gas under 7 Pa pressure These are the viscosity measurement results up to 450°C. 1... Drive motor 2... External magnetic rotor, 3
... Internal magnetic rotor, 4... Drive shaft with magnet, 5.
...Twisted shaft, 6...1L load shaft with magnet, 7.8...
Magnetic detection gain, 7', 8'... Magnet, 9... Phase detector, 10... Stirrer, I +-... Measuring container, 12.
...Heating door, 13...Temperature measurement number. + 4 =-
Microcomputer! 5...Temperature controller,
I 6 ”' Mud meter, +7-...Printer, ■...
Closed container.

Claims (1)

[Scope of Claims] 1. A metal measurement container containing a fluid for viscosity measurement, a viscosity measurement system, a non-magnetic sealed container that houses the measurement container and the viscosity measurement system, and the viscosity measurement system arranged vertically. It has a structure in which an internal magnetic rotor, a drive shaft, a torsion shaft, a load shaft, and a stirrer immersed in the measurement container are connected from the top directly below the inner wall of the sealed container, and the drive shaft and load shaft are connected to each other. It has a structure in which magnets are installed, and further includes an external magnetic rotor installed outside the sealed container at a position facing the internal rotor, a motor for driving the rotor, and magnets installed on the drive shaft and the load shaft. Detecting magnetism 2
a magnetic detector, a recorder that records the current generated from the magnetic detector, a temperature measured by a thermometer installed in a temperature measuring section provided on the side wall of the sealed container, and a current generated from the magnetic detector. A measurement system that measures the temperature at regular intervals, outputs the measurement results to a CRT and printer, and records them on a magnetic medium, and is capable of controlling the temperature of the measurement container to a constant temperature from the outside of the sealed container. A fluid viscosity measuring device characterized by comprising a heating furnace. 2. Insert a fluid at room temperature or a solid that becomes fluidized by heating to a certain temperature into a viscosity measurement container placed in a non-magnetic metal closed container, and rotate the fluid with a stirrer. In measuring the viscosity of the fluid, the stirrer is placed at a position facing the external magnetic rotor inside the closed container by rotating an external magnetic rotor outside the closed container, and a magnet is placed on the stirrer. A rotating torque is applied to the internal magnetic rotor, which is connected by a driven shaft, a torsion shaft, and a load shaft equipped with a magnet, to rotate it.
A method for measuring the viscosity of a fluid, characterized in that the amount of twist of a torsion shaft at various temperatures is detected from the outside of the sealed container using two magnetic detectors, and the viscosity is determined based on the detected values.