JP2011196804A - Heat-wire-type flow rate measurement apparatus and heat ray type flow rate measurement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat-wire-type flow rate measurement apparatus for dividing a flow rate of a gas-liquid mixing fluid into a gas and a liquid, and measuring them.SOLUTION: The heat-wire-type flow rate measurement apparatus comprises: a first temperature sensor 1S disposed at a first measurement point 1P; a plurality of second temperature sensors 2S vertically juxtaposed and disposed at a second measurement point 2P downstream of the first measurement point 1P; and a plurality of heaters H provided so as to correspond to the sensors 2S. With regard to temperatures measured by a plurality of the second temperature sensors 2S, a feedback control is implemented in a plurality of the heaters H so as to maintain a difference between the temperature measured by the first temperature sensor 1S at a predetermined value. The feedback control compares energy output from a plurality of the heaters H. A position of an interface S between the gas G and the liquid L in the gas-liquid mixing fluid F is determined. A flow rate of the liquid L is calculated by using the energy output from the heaters H-1 to H-3 corresponding to the second temperature sensors 2S-1 to 2S-3 lower than the interface S.

Description

  The present invention relates to a hot-wire flow measuring device and a hot-wire flow measuring method for measuring the flow rate of a low-temperature liquefied gas such as liquid hydrogen.

  A hot-wire flow meter is known as one of the flow meters. As a hot wire type flow meter, there is a device provided with a wire made of an oxide high temperature superconducting ceramic material inserted into a flow path, and an ammeter for measuring the value of a current flowing in the wire (for example, a patent) Reference 1).

JP-A-8-101051

  Since the low-temperature liquefied gas is easily vaporized, it may flow in the state of a gas-liquid mixed fluid in which the upper layer is a gas and the lower layer is a liquid. When the flow rate of the low-temperature liquefied gas (liquid flow rate) is measured in this state, the flow rate cannot be accurately measured because the flow rate of the low-temperature liquefied gas gas is included.

  An object of the present invention is to provide a hot-wire flow measuring device and a hot-wire flow measuring method capable of measuring a flow rate of a gas-liquid mixed fluid in which the upper layer is a gas and the lower layer is a liquid by dividing the gas into a liquid and a liquid. To do.

  A hot-wire flow rate measuring device according to one aspect of the present invention that achieves the above object is provided in a horizontal direction, and a pipe line through which a gas-liquid mixed fluid in which an upper layer is a gas and a lower layer is a liquid can flow, and the pipe A first temperature sensor that is disposed at a first measurement point of the path and measures a temperature serving as a reference of the gas-liquid mixed fluid, and is different from the first measurement point in a direction in which the gas-liquid mixed fluid flows. A plurality of second temperature sensors that are arranged in the vertical direction at the second measurement point of the position and correspond to each of the plurality of second temperature sensors that measure the temperature of the gas-liquid mixed fluid and the plurality of second temperature sensors. A plurality of heaters for heating the corresponding second temperature sensors, and for each temperature measured by the plurality of second temperature sensors, the temperature measured by the first temperature sensor; To keep the difference between A control unit that feedback-controls the plurality of heaters and energy output from each of the plurality of heaters by feedback control by the control unit are compared to determine the position of the gas-liquid interface of the gas-liquid mixed fluid Output from the heater corresponding to the second temperature sensor located below the interface determined by the determination unit out of the energy output from each of the plurality of heaters by feedback control by the control unit The calculation of the liquid flow rate of the gas-liquid mixed fluid using the determined energy, and the gas-liquid using the energy output from the heater corresponding to the second temperature sensor located above the interface determined by the determination unit A calculation unit that executes at least one of calculation of the gas flow rate of the mixed fluid.

  According to this configuration, the energy output from each of the plurality of heaters by the feedback control is compared to determine the position of the gas-liquid interface of the gas-liquid mixed fluid. Thus, the flow rate of the gas-liquid mixed fluid can be calculated separately for gas and liquid. The reason why the position of the interface can be determined by comparing the energy output from the heater is that the specific energy differs between the gas and the liquid, and therefore the value of the output energy is different.

  The said structure WHEREIN: The said some 2nd temperature sensor can be set as the structure arrange | positioned along with the up-down direction along the internal peripheral surface of the said pipe line.

  According to this configuration, the physical resistance of the plurality of second temperature sensors with respect to the flow of the gas-liquid mixed fluid can be reduced.

  In the above configuration, there are a plurality of the first temperature sensors, which are arranged in the vertical direction at the first measurement point, and each of the plurality of first temperature sensors includes a corresponding second temperature sensor and It is located at the same height, and the control unit is configured to perform feedback control that keeps the difference between the temperatures measured by the first temperature sensor and the second temperature sensor located at the same height at a predetermined value. be able to.

  According to this configuration, in the feedback control, the temperature difference between the gas and the liquid of the gas-liquid mixed fluid can be controlled to be a predetermined value, so that the measurement accuracy of the flow rate of the gas-liquid mixed fluid can be improved. Can do.

  The hot-wire flow rate measuring method according to another aspect of the present invention provides the gas-liquid mixed fluid at a first measurement point of a pipeline in which a gas-liquid mixed fluid whose upper layer is gas and lower layer is liquid flows in the horizontal direction. The temperature of the gas-liquid mixed fluid is measured at a plurality of locations in the vertical direction at a second measurement point that is different from the first measurement point in the direction in which the gas-liquid mixed fluid flows. A temperature measurement step for measuring the temperature, a heating step for individually heating the plurality of locations of the second measurement point during the temperature measurement step, and a second measurement point during the temperature measurement step. A control step of performing feedback control in the heating step in order to maintain a difference between the measured temperature at each of the plurality of locations and the temperature measured at the first measurement point at a predetermined value; and Ste A determination step of comparing the energy given to each of the plurality of locations of the second measurement point by feedback control by a control to determine the position of the gas-liquid interface of the gas-liquid mixed fluid; and the control The gas-liquid mixed fluid that uses energy applied to a location below the interface determined in the determination step among energy applied to each of the plurality of locations of the second measurement point by feedback control in steps. And a calculation step for executing at least one of the calculation of the flow rate of the liquid and the calculation of the flow rate of the gas of the gas-liquid mixed fluid using the energy given to the location above the interface determined in the determination step.

  According to this method, the position of the gas-liquid interface of the gas-liquid mixed fluid is determined by comparing the energy applied to each of the plurality of second measurement points by feedback control. Based on the position of the interface, the flow rate of the gas-liquid mixed fluid can be calculated separately for gas and liquid.

  According to the present invention, a gas-liquid mixed fluid in which the upper layer is gas and the lower layer is liquid can be divided into gas and liquid and the flow rate can be measured.

It is a figure which shows an example of the use condition of the hot wire type flow measuring device which concerns on one Embodiment of this invention. It is a figure which shows the arrangement | positioning relationship of the pipe line, 1st temperature sensor, 2nd temperature sensor, and heater with which the said hot-wire type flow measuring device is equipped. It is a block diagram which shows the structure of the said hot-wire type flow measuring device. It is a graph which shows the temperature measured with the temperature sensor of the upstream and downstream. It is a graph which shows the relationship between the flow volume and the energy output from the heater. It is a flowchart explaining the hot wire type flow measuring method concerning one embodiment of the present invention. It is a graph which shows the energy output from the heater of the said hot-wire type flow measuring device at a certain time.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating an example of a usage state of a hot-wire flow rate measuring device 20 according to an embodiment of the present invention. The hot-wire flow rate measuring device 20 includes a pipe line 10 through which a fluid to be subjected to flow rate measurement can flow, and a personal computer PC that executes control, calculation, and the like necessary for flow rate measurement. The hot wire flow rate measuring device 20 measures the flow rate of the fluid (for example, liquid hydrogen) flowing through the transport pipe 6 that connects the tank 2 and the tank 4. The transport pipe 6 is divided into a transport pipe 6A extending in the horizontal direction and connected to the upstream tank 2 and a transport pipe 6B extending in the horizontal direction and connected to the downstream tank 4. Between the transport pipe 6A and the transport pipe 6B, a pipe line 10 is arranged in the horizontal direction. The liquid hydrogen contained in the upstream tank 2 flows through the transport pipe 6A, the pipe line 10, and the transport pipe 6B, and enters the downstream tank 4.

  FIG. 2 shows the conduit 10 provided in the hot-wire flow rate measuring device 20, the first temperature sensors 1S-1 to 1S-6, the second temperature sensors 2S-1 to 2S-6, and the heaters H-1 to H-6. It is a figure which shows the arrangement | positioning relationship. The symbol hyphen and the next number may be omitted. For example, if it is not necessary to distinguish each of the first temperature sensors 1S-1 to 1S-6, it may be referred to as the first temperature sensor 1S.

  Flange 12 is formed at both ends of pipe 10, and pipe 10 is connected to transport pipe 6 </ b> A and transport pipe 6 </ b> B at flange 12. The fluid flowing through the transport pipe 6 is in the state of a gas-liquid mixed fluid F in which the upper layer is the gas G and the lower layer is the liquid L, and the gas-liquid mixed fluid F flowing from the transport pipe 6A is a pipe line as shown by an arrow D. 10 is led to the transport pipe 6B. A first temperature sensor 1S is arranged at the first measurement point 1P of the pipe line 10, and a second temperature sensor 2S is arranged at the second measurement point 2P downstream of the first measurement point 1P. Has been. Since the second measurement point 2P only needs to be located at a position different from the first measurement point 1P in the direction in which the gas-liquid mixed fluid F flows (arrow D), the second measurement point is located upstream of the first measurement point 1P. 2P may be provided.

  At the second measurement point 2P, twelve second temperature sensors 2S are annularly arranged along the inner peripheral surface 14 of the pipe line 10. The second temperature sensors 2S-1 to 2S-6 on the left side and the second temperature sensors 2S-1 to 2S-6 on the right side are symmetrically arranged in a semicircular shape. At the second measurement point 2P, the second temperature sensors 2S-1, 2S-2, 2S-3, 2S-4, 2S-5, and 2S-6 are arranged from the bottom to the top of the pipeline 10. Therefore, the plurality of second temperature sensors 2S are arranged in the vertical direction at the second measurement point 2P.

  The second temperature sensor 2S can measure the temperature of a low-temperature liquefied gas such as liquid hydrogen or liquid helium, and a thermocouple made of manganin, rubrene, or the like is used.

  The heaters H-1 to H-6 are provided corresponding to the second temperature sensors 2S-1 to 2S-6, respectively. In the present embodiment, the heaters H-1 to H-6 are connected to the pipe 10. It is arranged in contact with each of the second temperature sensors 2S-1 to 2S-6 while being embedded in the peripheral wall. The heaters H-1 to H-6 are annularly arranged like the second temperature sensors 2S-1 to 2S-6.

  The heaters H-1 to H-6 heat the corresponding second temperature sensors 2S-1 to 2S-6. For example, the second temperature sensor 2S-3 is heated by the heater H-3. The second temperature sensor 2S is cooled by the gas-liquid mixed fluid F and simultaneously heated by the heater H.

  The heater H is an electric resistance element that can operate in the temperature range of the low-temperature liquefied gas, and is made of stainless steel, manganin, or the like. An electric resistance element (for example, an electric resistance element made of manganin as a material) having a positive temperature gradient of the electric resistance change in the temperature region of the low-temperature liquefied gas can also be used as the second temperature sensor 2S. The current flowing through the heater H is a direct current so that the heater H can operate even in the liquid helium temperature region.

  At the first measurement point 1P, the first temperature sensor 1S is disposed on the inner peripheral surface 14 of the pipe line 10 with the same structure as the second temperature sensor 2S. That is, twelve first temperature sensors 1 </ b> S are annularly arranged along the inner peripheral surface 14 of the pipe line 10. The first temperature sensors 1S-1 to 1S-6 on the left side and the first temperature sensors 1S-1 to 1S-6 on the right side are respectively arranged in a semicircular shape symmetrically. The first temperature sensors 1S-1, 1S-2, 1S-3, 1S-4, 1S-5, and 1S-6 are arranged from the bottom to the top of the pipe 10. Therefore, the plurality of first temperature sensors 1S are arranged side by side in the vertical direction at the first measurement point 1P.

  Each of the first temperature sensors 1S-1 to 1S-6 is located at the same height as the corresponding second temperature sensor 2S. For example, the height at which the first temperature sensor 1S-3 and the second temperature sensor 2S-3 are located is the same.

  The 1st temperature sensor 1S measures the temperature used as the standard of gas-liquid mixed fluid F, and the same thermocouple as 2nd temperature sensor 2S is used. Although not shown, a heat insulating member is provided between the adjacent first temperature sensors 1S and between the adjacent second temperature sensors 2S to electrically insulate them. Examples of such members include FRP (Fiber Reinforced Plastics) or glass fiber tapes. The first temperature sensor 1S, the second temperature sensor 2S, and the heater H have an integrated circuit structure.

  In the present embodiment, twelve first temperature sensors 1S are annularly arranged along the inner peripheral surface 14 of the pipe line 10. However, the plurality of first temperature sensors 1S are vertically moved at the first measurement point 1P. As long as they are arranged side by side, the semicircular left first temperature sensors 1S-1 to 1S-6 or the semicircular right first temperature sensors 1S-1 to 1S-6 alone are used. There may be. The same is true for the twelve second temperature sensors 2S. Further, the number of first temperature sensors 1S and second temperature sensors 2S is not limited to twelve.

  FIG. 3 is a block diagram showing the configuration of the hot-wire flow rate measuring device 20 according to one embodiment of the present invention. The hot-wire flow measuring device 20 includes a first temperature sensor 1S, a second temperature sensor 2S and a heater H, and a CPU (Central Processing Unit) 24, an interface 26, and a ROM (Read Only Memory) connected to each other via a bus 22. ) 28, a RAM (Random Access Memory) 30, a display unit 32, and an operation unit 34. The CPU 24, the interface 26, the ROM 28, the RAM 30, the display unit 32, and the operation unit 34 are provided in the personal computer PC shown in FIG.

  The CPU 24 executes the control necessary for measuring the flow rate of the gas-liquid mixed fluid F with respect to the hardware constituting the hot-wire flow rate measuring device 20.

  The interface 26 is connected to the first temperature sensor 1S, the second temperature sensor 2S, and the heater H. The temperature measurement signals output from the first temperature sensor 1 </ b> S and the second temperature sensor 2 </ b> S are input to the interface 26. In order to feedback-control the temperature of the gas-liquid mixed fluid F measured by the second temperature sensor 2S, a signal sent to the heater H is output via the interface 26.

  The ROM 28 is realized by a flash memory or the like, and stores a database necessary for calculating the flow rate of the gas-liquid mixed fluid F, software necessary for the operation of the hot wire flow rate measuring device 20, and the like. The RAM 30 temporarily stores data generated when the software is executed. The RAM 30 is realized by a DRAM (Dynamic Random Access Memory) or the like.

  The display unit 32 is realized by an LCD (Liquid Crystal Display) or the like, and displays the flow rate and the like of the gas-liquid mixed fluid F measured using the hot-wire flow rate measuring device 20. The operation unit 34 is provided with keys necessary for operation of the hot-wire flow rate measuring device 20.

  A control unit that executes control steps described later is realized by the first temperature sensor 1S, the second temperature sensor 2S, the heater H, the CPU 24, the ROM 28, and the RAM 30. The determination unit that executes the determination step and the calculation unit that executes the calculation step are all realized by the CPU 24, the ROM 28, and the RAM 30.

  Next, the principle regarding the flow rate necessary for understanding the method of measuring the flow rate of the gas-liquid mixed fluid F using the hot-wire flow rate measuring device 20 will be described. FIG. 4 is a graph showing the temperatures measured by the upstream and downstream temperature sensors. The horizontal axis indicates the positions of the first measurement point 1P and the second measurement point 2P in the direction in which the fluid flows. An upstream temperature sensor is disposed at the first measurement point 1P, and a downstream temperature sensor is disposed at the second measurement point 2P. The vertical axis indicates the temperature measured by the upstream and downstream temperature sensors.

  When the measured value at the upstream temperature sensor is the temperature T1, the downstream temperature sensor is heated by the heater so that the measured value at the downstream temperature sensor becomes the temperature T2. Ea indicates the energy output from the heater when the temperature T2a is measured by the downstream temperature sensor, and Eb indicates the energy output from the heater when the temperature T2b is measured by the downstream temperature sensor.

  If the flow velocity (flow rate) is large, the cooling amount of the temperature sensor on the downstream side increases, so the energy output from the heater (heater heating amount) must be increased. On the other hand, if the flow velocity (flow rate) is small, the cooling amount of the downstream temperature sensor is small, so the energy output from the heater must be small.

  In FIG. 4, since the energy output from the heater is Ea> Eb, the temperature T2a measured by the downstream temperature sensor when Ea is output is higher than the temperature T2b measured when Eb is output. It will be low.

  It is known that the flow rate and the energy output from the heater have a correlation as shown in FIG. Therefore, the flow rate can be measured based on the energy output from the heater. The above is the principle regarding the flow rate.

  A method for measuring the flow rate of the gas-liquid mixed fluid F using the hot-wire flow rate measuring device 20, in other words, a hot-wire flow rate measuring method according to an embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a flowchart illustrating this method.

[Temperature measurement step ST1]
A gas-liquid mixed fluid F in which the upper layer is the gas G and the lower layer is the liquid L flows in the pipe line 10. The temperature which becomes the reference | standard of the gas-liquid mixed fluid F is measured in several places of an up-down direction with the 1st temperature sensor 1S arrange | positioned at the 1st measurement point 1P. At the same time, the temperature of the gas-liquid mixed fluid F is measured at a plurality of locations in the vertical direction by the second temperature sensor 2S disposed at the second measurement point 2P.

[Warming step ST2]
During the temperature measurement step ST1, a plurality of locations of the second measurement point 2P are individually heated. That is, the second temperature sensors 2S-1 to 2S-6 are heated by the corresponding heaters H-1 to H-6. For example, the second temperature sensor 2S-3 is heated by the heater H-3.

[Control step ST3]
In this step, for each temperature at a plurality of locations measured at the second measurement point 2P during the temperature measurement step ST1, a difference between each temperature at the plurality of locations measured at the first measurement point 1P is calculated. In order to maintain the predetermined value, feedback control is executed in the heating step ST2.

  More specifically, in the control step ST3, in order to keep the difference in temperature measured by the first temperature sensor 1S and the second temperature sensor 2S located at the same height at a predetermined value, the heaters H-1 to H- The feedback control for correcting the energy output from 6 is executed. That is, the difference between the temperatures measured by the first temperature sensor 1S-1 and the second temperature sensor 2S-1, the temperature measured by the first temperature sensor 1S-2 and the second temperature sensor 2S-2. In order to keep the difference between the temperatures measured by the first temperature sensor 1S-6 and the second temperature sensor 2S-6 at a predetermined value, the heaters H-1 to H-6 are individually fed back. Control.

[Judgment step ST4]
The energy output from each of the heaters H-1 to H-6 by the feedback control is compared, and the position of the interface S between the gas G and the liquid L of the gas-liquid mixed fluid F is determined. In other words, the energy given to each of the plurality of locations of the second measurement point 2P by the feedback control in the control step ST3 is compared, and the position of the interface S between the gas G and the liquid L of the gas-liquid mixed fluid F is determined. To do.

  The determination step ST4 will be described in detail with reference to FIG. FIG. 7 is a graph showing energy output from the heaters H-1 to H-6 of the hot-wire flow rate measuring device 20 at a certain point in time. The horizontal axis represents energy, and the vertical axis represents the vertical position of the heaters H-1 to H-6. The vertical positions of the heaters H-1 to H-6 correspond to the vertical positions of the second temperature sensors 2S-1 to 2S-6.

  The energy Ea output from the heater H-1 (heater H-2, heater H-3), the energy Eb output from the heater H-4, and the energy Ec output from the heater H-5 (heater H-6) are , Ea> Eb> Ec is established. This is because the interface S is located at the location of the first temperature sensor 1S-4 and the second temperature sensor 2S-4, and the first temperature sensor 1S-1 to 1S-3 and the second temperature sensor 2S. The liquid L of the gas-liquid mixed fluid F flows in the locations of -1 to 2S-3, and the locations of the first temperature sensors 1S-5 to 1S-6 and the second temperature sensors 2S-5 to 2S-6. This is because the gas G of the gas-liquid mixed fluid F is flowing. That is, even if the same substance is used, the specific heat is different between the gas state and the liquid state. Since there is the interface S at the location of the second temperature sensor 2S-4, the energy Eb output from the heater H-4 is between Ea and Ec.

  Therefore, the position of the interface S between the gas G and the liquid L of the gas-liquid mixed fluid F can be determined by comparing the energy output from the heaters H-1 to H-6.

[Calculation step ST5]
In the present embodiment, the flow rate is calculated for each of the liquid L and gas G of the gas-liquid mixed fluid F. For the calculation of the flow rate of the liquid L, the second temperature sensor (in the present embodiment, the second temperature sensor) located below the interface S determined in the determination step ST4 out of the energy output from each of the heaters H by feedback control. Energy output from the heaters corresponding to the temperature sensors 2S-1 to 2S-3) (heaters H-1 to H-3 in this embodiment) are used.

  On the other hand, for the calculation of the flow rate of the gas G, out of the energy output from each of the heaters H by feedback control, a second temperature sensor (in this embodiment) located above the interface S determined in the determination step ST4. Energy output from a heater (heaters H-5 to H-6 in this embodiment) corresponding to the second temperature sensors 2S-5 to 2S-6) is used. The value of the flow rate measured by the calculation is displayed on the display unit 32 in FIG. Depending on the purpose, only the flow rate of the liquid L may be calculated, or only the flow rate of the gas G may be calculated.

  As described above, since the specific heat differs between the gas G and the liquid L, the present embodiment focuses on the point that the value of energy output from the heater H is different.

  According to the present embodiment, the energy output from each of the heaters H-1 to H-6 is compared by feedback control to determine the position of the interface S between the gas G and the liquid L of the gas-liquid mixed fluid F. Therefore, based on the determined position of the interface S, the flow rate of the gas-liquid mixed fluid F can be calculated separately for the gas G and the liquid L. For this reason, even if the low-temperature liquefied gas flows in the pipeline 10 in the state of the gas-liquid mixed fluid F, the flow rate of the gas-liquid mixed fluid F excluding the gas G (the flow rate of the liquid L) can be measured. The measurement accuracy of the flow rate of the low-temperature liquefied gas (liquid flow rate) can be improved.

  Moreover, since the energy output from the heaters H-1 to H-6 is corrected according to the gas G and the liquid L, the energy output from the heater H can be reduced as compared with the case where the correction is made uniformly. Therefore, the amount of low-temperature liquefied gas vaporized by the energy output from the heater H can be reduced.

  Further, in the control step, the energy output from the heater H is corrected in order to keep the temperature difference measured by the first temperature sensor 1S and the second temperature sensor 2S located at the same height at a predetermined value. Feedback control is executed. Thereby, since the temperature difference between the gas G and the liquid L of the gas-liquid mixed fluid F can be controlled to a predetermined value, the measurement accuracy of the flow rate of the gas-liquid mixed fluid F can be improved.

  In the present embodiment, the first temperature sensors 1S-1 to 1S-6 are provided so as to correspond to the second temperature sensors 2S-1 to 2S-6, but the first temperature sensor 1S is gas-liquid mixed. Since the reference temperature of the fluid F is measured, even one is possible.

  Further, according to the present embodiment, the first temperature sensor 1S and the second temperature sensor 2S are arranged in the vertical direction along the inner peripheral surface 14 of the conduit 10, so that the gas-liquid mixed fluid F The physical resistance of the first temperature sensor 1S and the second temperature sensor 2S with respect to the flow can be lowered. If the first temperature sensor 1 </ b> S and the second temperature sensor 2 </ b> S are structured such that their surfaces are flush with the inner peripheral surface 14 of the pipe line 10 in the side wall of the pipe line 10, the flow through the pipe line 10. For the gas-liquid mixed fluid F, the first temperature sensor 1S and the second temperature sensor 2S can be prevented from becoming a physical resistance.

  If the physical resistance of the first temperature sensor 1S and the second temperature sensor 2S with respect to the flow of the gas-liquid mixed fluid F is not a problem, the first temperature sensor 1S and the second temperature sensor 2S are connected to the pipe line. It is also possible to arrange them in the radial direction of 10 cross sections.

1S-1 to 1S-6 1st temperature sensor 2S-1 to 2S-6 2nd temperature sensor H-1 to H-6 heater F gas-liquid mixed fluid G gas L liquid S interface D arrow (gas-liquid mixed fluid Direction of flow)
1P 1st measurement point 2P 2nd measurement point PC PC 2, 4 Tank 6, 6A, 6B Transport pipe 10 Pipe line 12 Flange 14 Inner peripheral surface 20 Hot-wire flow measuring device 22 Bus 24 CPU
26 Interface 28 ROM
30 RAM
32 Display unit 34 Operation unit

Claims (4)

A pipe that is arranged in a horizontal direction and through which a gas-liquid mixed fluid in which the upper layer is a gas and the lower layer is a liquid can flow;
A first temperature sensor that is disposed at a first measurement point of the pipe and that measures a temperature serving as a reference of the gas-liquid mixed fluid;
A plurality of second temperatures that are arranged side by side in a vertical direction at a second measurement point that is different from the first measurement point in the direction in which the gas-liquid mixed fluid flows, and that measure the temperature of the gas-liquid mixed fluid. A sensor,
A plurality of heaters that are provided corresponding to each of the plurality of second temperature sensors, and that heat the corresponding second temperature sensors;
A control unit that feedback-controls the plurality of heaters to maintain a difference between the temperature measured by the plurality of second temperature sensors and the temperature measured by the first temperature sensor at a predetermined value; ,
A determination unit that compares the energy output from each of the plurality of heaters by feedback control by the control unit and determines the position of the gas-liquid interface of the gas-liquid mixed fluid;
Of the energy output from each of the plurality of heaters by feedback control by the control unit, the energy output from the heater corresponding to the second temperature sensor located below the interface determined by the determination unit is used. Calculation of the flow rate of the liquid of the gas-liquid mixed fluid and the gas of the gas-liquid mixed fluid using energy output from the heater corresponding to the second temperature sensor located above the interface determined by the determination unit A hot-wire flow rate measuring device comprising: a calculation unit that executes at least one of the flow rate calculations.   2. The hot-wire flow rate measuring device according to claim 1, wherein the plurality of second temperature sensors are arranged in a vertical direction along an inner peripheral surface of the pipe line. There are a plurality of the first temperature sensors, and the first temperature sensors are arranged in the vertical direction at the first measurement point,
Each of the plurality of first temperature sensors is located at the same height as the corresponding second temperature sensor;
The said control part performs the feedback control which maintains the difference of the temperature measured by the 1st temperature sensor and the 2nd temperature sensor which are located in the same height at a predetermined value, It is characterized by the above-mentioned. Hot-wire flow meter. At the first measurement point of the pipe line in which the gas-liquid mixed fluid in which the upper layer is gas and the lower layer is liquid flows in the horizontal direction, the temperature serving as the reference of the gas-liquid mixed fluid is measured, and the gas-liquid mixed fluid A temperature measurement step of measuring the temperature of the gas-liquid mixed fluid at a plurality of locations in the vertical direction at a second measurement point at a position different from the first measurement point in the direction in which the gas flows;
A heating step of individually heating the plurality of points of the second measurement point during the temperature measurement step;
In order to keep the difference between the temperature measured at the first measurement point and the temperature measured at the first measurement point at a predetermined value for each temperature of the plurality of locations measured at the second measurement point during the temperature measurement step. A control step for feedback control in the temperature step;
A determination step of comparing the energy applied to each of the plurality of locations of the second measurement point by feedback control by the control step to determine the position of the gas-liquid interface of the gas-liquid mixed fluid;
The gas-liquid that uses energy given to locations below the interface determined in the determination step among the energy applied to each of the plurality of locations of the second measurement point by feedback control in the control step. A calculation step of performing at least one of calculation of the liquid flow rate of the mixed fluid and calculation of the gas flow rate of the gas-liquid mixed fluid using energy applied to a location above the interface determined in the determination step; A hot-wire flow rate measuring method comprising:

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