JP5730184B2 - Fluid temperature measuring device and fluid temperature measuring method - Google Patents

Description

  The present invention relates to a fluid temperature measuring device and a temperature measuring method for measuring the temperature of a fluid existing in a storage tank such as a tank, an evaporating can, a concentrating can or the like existing in a plant such as a nuclear reactor plant or a chemical plant. It is.

  An example of a conventional fluid temperature measuring device will be described with reference to FIG. 1 showing an embodiment of the present invention. In the following description, the inside of a storage tank or piping is represented as a space body. A space body 1 in FIG. 1 is filled with a fluid such as gas or liquid, and a thermometer 4 is installed in the space body 1 in order to measure the temperature of the fluid. However, when the space body 1 cannot be directly accessed, the temperature detecting element 4a of the thermometer 4 is inserted into the space body 1 from the outside as shown in FIG. It is necessary to make it.

  In this case, a guide tube 5 for inserting the thermometer 4 from the outside is required, and the temperature in the space body 1 is measured by inserting the temperature detection element 4a at the distal end side of the guide tube 5. Become.

Patent Document 1 discloses a technique for inserting such a guide pipe into a pipe and measuring the temperature of the fluid flowing through the pipe. Patent Document 2 discloses a technique for measuring the velocity of air flowing through a space of an air conditioning system in an exposure apparatus and correcting the temperature of the flowing air.
In the description of FIG. 1, constituent elements and the like that are not described will be described in an embodiment of the present invention.

JP 2000-155055 A JP 2010-216806 A

  When the temperature of the fluid in the space body 1 is measured, the guide tube 5 is often used in a sealed state so that the fluid in the space body 1 does not leak to the outside. There may be a case where a hole is formed in the inner wall due to a hole in a joint portion opened at the time of manufacturing the guide tube 5 or aging deterioration. The pressure in the space body 1 is often maintained at a negative pressure with respect to the outside in order to make it sealed, but in this case, if there is a hole in the guide tube 5, the guide tube 5 is sealed. A fluid such as air flows in the guide tube 5. In such a case, since the fluid sealed in the guide tube flows in the vicinity of the temperature detecting element 4a, the measured value of the temperature of the fluid existing in the space body 1 does not show a correct value.

  The technique of Patent Document 1 does not recognize the above-described problem, and there is no suggestion of means for solving it. On the other hand, Patent Document 2 discloses a technique for measuring the wind speed of air flowing in an air conditioning system and correcting the temperature of the flowing air, but Patent Document 2 also discloses a vicinity of a thermometer using a fluid different from the measurement target. Therefore, there is no recognition of the problem of correcting the temperature of the fluid existing in the space to be measured nor suggestion of a solution.

  The object of the present invention is to reduce the temperature measurement error of the fluid in the space due to the influence of the different fluid when the fluid enclosing the guide tube flows in the vicinity of the temperature detecting element in the fluid temperature measuring device or the temperature measuring method. It is to be.

In order to achieve the above object, the present invention has at least the following features.
In the present invention, a guide tube having a distal end sealed and a distal end side inserted from a wall surface of a space body having a first fluid therein, and a temperature detection element disposed on the distal end side of the guide tube A fluid temperature measuring device that measures the temperature of the first fluid, wherein the space body is relatively closer to the guide tube. A flowmeter for measuring the flow rate and temperature of the second fluid existing in the guide tube and maintained at a negative pressure, and a second thermometer; and the processing section includes: the flowmeter and the second thermometer The temperature of the first fluid is corrected based on the measurement result.

  Further, the present invention provides a first thermometer in which a tip end side is hermetically sealed, and a temperature measuring element is housed on the tip end side of the guide tube into which the tip end side is inserted from a wall surface of a space body having a first fluid therein. In the fluid temperature measuring method for measuring the temperature of the first fluid, the space body is maintained at a relatively negative pressure relative to the guide tube, and the flow rate and temperature of the second fluid existing in the guide tube are measured. The temperature of the first fluid is corrected based on the measurement result.

Further, the correction may be performed based on a temperature correction coefficient defined in advance based on experiments or simulations.
The space body may be any one of a tank, a can, and a pipe.

Furthermore, the said space body may comprise a nuclear power plant or a chemical plant.
The second fluid may be a different type of fluid from the first fluid.

  Further, the correction may be performed by multiplying the measured value measured by the first thermometer by the temperature correction coefficient.

  According to the present invention, in the fluid temperature measurement device or the temperature measurement method, when the fluid enclosing the guide tube flows in the vicinity of the temperature detection element, the temperature measurement error of the measurement target fluid due to the influence of the different fluid is reduced. it can.

It is a figure which shows the 1st Example of the fluid temperature measuring apparatus of this invention. FIG. 1 is a diagram in which a temperature correction coefficient relation table in the first embodiment of the fluid temperature measuring apparatus of the present invention is added to FIG. It is a figure which shows the 2nd Example of the fluid temperature measuring apparatus of this invention. It is a figure which shows the 3rd Example of the fluid temperature measuring apparatus of this invention.

Embodiments of the present invention will be described with reference to the drawings.
(Example 1)
In FIG. 1, a monitoring gas 2k such as a radioactive gas generated in a nuclear power plant is sealed as a monitoring fluid 2 in a space body 1 as a first embodiment 1, for example, in a tank, and the temperature of the monitoring gas 2k is measured. 1 is a diagram illustrating a first embodiment 100A of a fluid temperature measuring device 100. FIG.
In order to measure the temperature of the monitoring fluid 2k in the space body 1, the fluid temperature measuring device 100A includes a space fluid thermometer 4 having a temperature detecting element 4a at the tip, and the space fluid thermometer 4 from the wall surface of the space body 1. Between the guide tube 5 in which the pipe fluid 3 which is a fluid different from the monitoring gas 2k exists and the vacuum close to the true temperature of the monitoring gas 2k based on the spatial fluid measurement temperature 6 measured by the spatial fluid thermometer 4 It has a processing unit 7 for obtaining the fluid temperature 8, a memory 10 for storing a program for obtaining the fluid temperature between the vacuums and predetermined data, and a display 9 for displaying the obtained fluid temperature for the vacuum. If the pipe fluid 3 is air, the end opposite to the temperature detecting element 4a of the guide pipe 5 is open. If the pipe fluid 3 is not air, the opposite end may be connected to a fluid supply device (not shown). Since the monitoring fluid 2 in the space body 1 is a gas, the tube fluid 3 is also preferably a gas. If different types are desired, different types may be selected, and if the same type is desired, the same type may be selected. In addition, in order to make the inside of the space body 1 sealed, it is maintained at a negative pressure with respect to the outside by a device (not shown).

  Furthermore, the fluid temperature measuring device 100 </ b> A includes a pipe thermometer 11 that measures the temperature of the pipe fluid 3 existing in the guide pipe 5 and a pipe flowmeter 12 that measures the flow rate of the pipe fluid 3. Then, the pipe temperature Tk and the pipe flow rate Fk in the guide pipe 5 which are those outputs are taken into the processing unit 7.

  In such a fluid temperature measuring device 100A, when a hole is formed in the guide tube 5 into which the space fluid thermometer 4 is inserted, for example, a hole 5a is formed at the position shown in FIG. Because of the pressure, the pipe fluid 3 flows in the guide pipe 5 toward the hole 5a, and an error occurs in the spatial fluid measurement temperature 6.

In order to eliminate this error, a correction method of the spatial fluid measurement temperature 6 performed in the processing unit 7 will be described below.
First, as shown in FIG. 2, the temperature correction coefficient Hk of the spatial fluid measurement temperature 6 based on the in-pipe temperature Tk and the flow rate Fk of the pipe fluid 3 flowing in the guide pipe 5 in advance is stored in the memory 10 as a temperature correction coefficient relation table 15. Remember.

  Next, a temperature correction coefficient Hk corresponding to the pipe temperature Tk and the pipe flow rate Fk in the guide pipe 5 is derived from the temperature correction coefficient relation table 15 in the memory 10, and the inter-vacuum fluid temperature 8 close to the true temperature is obtained. The inter-vacuum fluid temperature 8 is obtained by multiplying the measured spatial fluid temperature 6 by the temperature correction coefficient Hk.

  Next, a specific example regarding the correction method performed in the processing unit 7 will be described. When the tube temperature Tk in the guide tube 5 is 15 ° C. and the tube flow rate Fk is 22 ml / min, the temperature correction coefficient Hk is 1.3 from the temperature correction coefficient relationship table 15 stored in the memory 10. Then, when the spatial fluid measurement temperature 6 of the spatial fluid thermometer 4 is 25 ° C., the correction coefficient 1.3 is applied to obtain the inter-vacuum fluid temperature 8 close to the actual temperature in the space body 1. 5 ° C. (= 25 * 1.3) can be obtained. Finally, the obtained inter-vacuum fluid temperature 8 is sent to the display 9 and displayed.

  As described above, according to Example 1, in the embodiment in which the gas is sealed as the monitoring fluid 2 of the space body 1, the guide tube 5 has a hole, and the gas in the space body 1 is in the guide tube 5. Even when different fluids are flowing, it is possible to measure the spatial fluid temperature close to the true of the liquid in the space body 1 without errors due to the flow.

(Example 2)
FIG. 3 is a diagram showing a second embodiment 100B of the fluid temperature measuring apparatus 100. As shown in FIG. In addition to the fluid temperature measuring device, the embodiment of the space body 1 to which the fluid temperature measuring device 100B is applied is different.

  First, the differences of the fluid temperature measuring device 100B from the first embodiment with respect to the first embodiment are as follows. Other configurations and operations of the fluid temperature measuring device 100B are the same as those in the first embodiment. In the first embodiment, the temperature correction coefficient Hk is obtained from the temperature correction coefficient relation table 15, whereas in the second embodiment, the temperature correction coefficient Hk is calculated as a two-variable approximate function Hk = f (in-pipe temperature Tk and in-pipe flow rate Fk). Tk, Fk) and stored in the memory 10 in the function format. Regardless of the temperature correction coefficient relationship table 15 of the first embodiment or the two-variable approximate function of the second embodiment, if the system such as the size of the space body 1 to be measured and the type of the pipe fluid 3 flowing through the guide pipe 5 is determined. It can be specified based on experiments and simulations in advance.

  Next, Embodiment 2 of Example 2 differs from Embodiment 1 of Example 1 in that it is used as a monitoring fluid 2 in a space body 1 (for example, a storage tank such as a tank or a concentrated can), for example, for processing in a chemical plant. The liquid 2e such as nitric acid, sulfuric acid or waste liquid thereof is sealed, and the fluid temperature measuring device 100B measures the temperature of the liquid 2e.

According to the second embodiment described above, the temperature correction can be performed more finely by using the two-variable approximate function. Further, when the temperature correction coefficient is further finely defined, the memory capacity is larger than that in the first embodiment. There is an effect that can be reduced.
According to Example 2 described above, in the embodiment in which the liquid as the monitoring fluid of the space body 1 is sealed, the guide tube 5 has a hole, and the guide tube 5 has a fluid different from the gas of the space body 1. Even in a state where the fluid flows, the error due to this flow is eliminated, and the fluid temperature close to the true of the liquid in the space body 1 can be measured.

(Example 3)
FIG. 4 is a diagram illustrating a third example in which the temperature of the monitoring fluid 2 flowing through the space body 1 which is a pipe is measured as an embodiment. The monitoring fluid 2 may be gas or liquid.
In Example 3, only the embodiment to be measured is different, and the fluid temperature measuring device 100A shown in Example 1 or the fluid temperature measuring device 100B shown in Example 2 is used as the fluid temperature measuring device 100C.

  Therefore, according to the fluid temperature measuring device 100C shown in the third embodiment, the same effects as those of the first or second embodiment can be obtained.

  As described above in each embodiment, the present invention does not correct the measured value of the thermometer based on the flow rate of the liquid flowing in the space body in which the thermometer is mounted, but the guide in which the thermometer is mounted. The measured value of the thermometer which measures the temperature of the fluid of the space body in which the guide tube is inserted is corrected based on the in-tube flow rate and the in-tube temperature of the fluid flowing through the tube.

  The present invention can be applied to a fluid temperature measuring device in which a thermometer is inserted into a space body from the outside via a guide tube.

1: Spatial body 2: Monitoring fluid 2e: Monitoring liquid 2k: Monitoring gas 3: Tube fluid 4: Spatial fluid thermometer 4a: Temperature measuring element 5: Guide tube 5a: Hole generated in the guide tube 6: Spatial fluid measurement temperature 7: Processing unit 8: Fluid temperature between vacuums 9: Display 10: Memory 11: In-pipe thermometer 12: In-pipe flow meter 15: Temperature correction coefficient relation table
100, 100A, 100B: Fluid temperature measuring device Fk: In-pipe flow rate Hk: Temperature correction coefficient Tk: In-pipe temperature

Claims (10)

A guide tube whose front end side is sealed and the front end side is inserted from the wall surface of the space body including the first fluid therein; and a first thermometer in which a temperature detection element is built in the front end side of the guide tube; ,
A fluid temperature measurement device that measures the temperature of the first fluid, and a processing unit that processes output from the first thermometer,
The space body is maintained at a negative pressure relative to the guide tube, and includes a flow meter and a second thermometer for measuring a flow rate and temperature of a second fluid existing in the guide tube, and the processing unit includes: A fluid temperature measuring device that corrects the temperature of the first fluid based on measurement results of the flow meter and the second thermometer. The fluid temperature measuring device according to claim 1, wherein the correction is performed based on a temperature correction coefficient defined in advance based on experiments or simulations. 3. The fluid temperature measuring apparatus according to claim 2, wherein the regulation is performed by a table or an approximate function using two measurement results of the flow meter and the second thermometer. The fluid temperature measuring device according to claim 1, wherein the space body is any one of a tank, a can, and a pipe. The space body fluid temperature measuring device according to claim 4, wherein configuring the nuclear power plant or chemical plant. 2. The second fluid is a fluid of a different type from the first fluid.
The fluid temperature measuring device according to 1. The fluid temperature measuring device according to claim 1 or 6, wherein the second fluid is a gas if the first fluid is a gas, and a liquid if the first fluid is a liquid. The first thermometer is a first thermometer that is hermetically sealed on the distal end side and includes a temperature measuring element on the distal end side of the guide tube inserted into the distal end side from the wall surface of the space body including the first fluid therein. In a fluid temperature measurement method for measuring a fluid temperature,
The space body is maintained at a relatively negative pressure relative to the guide tube, measures the flow rate and temperature of the second fluid existing in the guide tube, and corrects the temperature of the first fluid based on the measurement result. A method for measuring a fluid temperature. 9. The fluid temperature measuring method according to claim 8, wherein the correction is performed based on a temperature correction coefficient defined in advance based on experiments or simulations. The fluid temperature measuring method according to claim 9 , wherein the correction is performed by multiplying the measurement value measured by the first thermometer by the temperature correction coefficient.

Images