Measuring device

Abstract

The present invention reduces the influence of heat radiation when measuring the temperature of gas inside a furnace or the like. This measurement device (1) is provided with a processor (11) and a container (12), the container (12) having therein a conduit (12P) capable of substantially closing a first end portion (12E1) and a second end portion (12E2), a portion of the container (12) including the first end portion (12E1) being substantially transparent, the first end portion (12E1) being capable of being disposed inside a high-temperature gas, the conduit (12P) being capable of being sealed with a working fluid, and the conduit (12P) being capable of being disposed inside the high-temperature gas. The heat accumulator (14) and the cooling unit (15) are disposed in this order from the first end (12E1) toward the second end (12E2), and the processor (11) can execute a temperature estimation process. The temperature estimation process estimates the temperature (second temperature TH) of the high-temperature gas on the basis of a ratio (r) of the length from one side of the heat accumulator (14) to the first end (12E1) to the length of the conduit (12P), the temperature (first temperature TL) of the working fluid between the cooling unit (15) and the second end (12E2), and the frequency (f) of the self-excited vibration generated by the heat accumulator (14).

Description

Technical Field

[0001] The present invention relates to a measuring device. Background Art

[0002] Currently, the internal temperature measured using various temperature measuring devices is used to control the temperature of a furnace or the like. Regarding the measurement of the internal temperature, it is necessary to measure the temperature of the gas present inside the furnace or the like. The temperature of the gas present inside the furnace or the like becomes a feedback index for controlling the energy input of the furnace or the like. Therefore, this temperature is important for energy saving and decarbonization gas. In addition, the temperature of the gas present inside the furnace or the like is an important index in incineration and combustion. In addition, the temperature of the gas present inside the furnace or the like is crucial for quality control in firing and heat treatment.

[0003] Regarding the measurement of the temperature of the gas present inside the furnace or the like, Patent Document 1 discloses that thermocouples penetrating the furnace wall are arranged in each temperature control region. According to Patent Document 1, the temperature of the atmosphere gas can be measured.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2016-130349 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] However, the metal part of the thermocouple like that in Patent Document 1 is opaque. Therefore, such a thermocouple absorbs electromagnetic waves. Inside the furnace or the like, a high-temperature furnace wall or the like emits thermal radiation. The electromagnetic waves emitted by the thermal radiation are absorbed by the opaque thermocouple, thereby increasing the temperature of the thermocouple. Therefore, there is a concern that due to thermal radiation, the temperature of the thermocouple becomes higher than the temperature of the atmosphere gas.

[0009] An object of the present invention is to reduce the influence of thermal radiation when measuring the temperature of a gas inside a furnace or the like.

[0010] Means for Solving the Problems

[0011] The inventors of the present invention conducted in-depth research to solve the above problems and found that by making the furnace interior part of the thermoacoustic device transparent and measuring the temperature or the like based on the frequency of self-excited vibration in the thermoacoustic device, the above object can be achieved, and thus the present invention was completed. Specifically, the present invention provides the following.

[0012] The invention of the first feature provides a measuring device including a processor and a container. Inside the container, there is a pipeline capable of substantially enclosing a first end and a second end. A part of the container including the first end is substantially transparent. The first end can be disposed inside a high-temperature gas. The inside of the pipeline can be filled with a working fluid, and a regenerator and a cooling component are sequentially disposed from the first end toward the second end. The regenerator has a void communicating with the regenerator along the direction of the pipeline and can generate self-excited oscillation of thermoacoustics through a temperature gradient along the direction of the pipeline. The cooling component can cool the working fluid. The processor can execute temperature estimation processing, and the temperature estimation processing estimates the temperature (second temperature) of the high-temperature gas based on the ratio of the length from one side of the regenerator to the first end to the length of the pipeline, the temperature of the working fluid between the regenerator and the second end, and the frequency of the self-excited oscillation.

[0013] According to the invention of the first feature, the temperature of the first end disposed inside the high-temperature gas is heated by heat conduction from the high-temperature gas. A part of the container including this first end is substantially transparent. Therefore, it is prevented that the temperature of the first end becomes higher than the temperature of the high-temperature gas due to thermal radiation. Thus, it is expected that the temperature of the working fluid on the first-end side inside the pipeline is approximately the same as the temperature of the high-temperature gas.

[0014] According to the invention of the first feature, the temperature of the working fluid inside the pipeline between the cooling component and the second end is cooled by the cooling component. Moreover, a temperature gradient along the direction of the pipeline is generated from the first-end side of the regenerator to the cooling-component side of the regenerator. Through the temperature gradient along the direction of the pipeline, the regenerator generates self-excited oscillation of thermoacoustics. Moreover, since both ends of the pipeline are substantially enclosed, this self-excited oscillation includes a standing wave in the closed pipe. The wavelength of the standing wave corresponds to the length of the pipeline.

[0015] However, it is known that there is a relationship corresponding to the type of gas between the speed of sound in the gas and the temperature. When the speed of sound changes, the frequency corresponding to the wavelength also changes. In the case where the speed of sound of a part of the working fluid inside the pipeline changes, the frequency corresponding to the wavelength changes according to the ratio of the changed part to the whole.

[0016] Therefore, if the above ratio, the temperature of the working fluid, and the frequency are used, the temperature of the working fluid inside the pipeline corresponding to the above part can be calculated. Since the above part is substantially transparent, it is prevented that the temperature of the working fluid inside the pipeline corresponding to the above part becomes higher than the temperature of the high-temperature gas due to thermal radiation. That is, the temperature of the working fluid inside the pipeline corresponding to the above part is less affected by thermal radiation and is expected to be approximately the same as the temperature of the high-temperature gas.

[0017] In the invention according to the first feature, the temperature estimation process is a process using the above ratio, the temperature of the working fluid, and the frequency. Therefore, in the invention according to the first feature, since the processor executes the first temperature acquisition process, the frequency acquisition process, and the temperature estimation process, the above-described second temperature can be estimated while reducing the influence of thermal radiation.

[0018] In the invention according to the first feature, the temperature estimation process can be realized without disposing a temperature measurement unit or the like inside the high-temperature gas. Thus, the measuring device can be configured using a temperature measurement unit or the like whose operating temperature range does not include the temperature of the high-temperature gas. Further, thus, the temperature measurement unit can measure the temperature of the working fluid without being affected by thermal radiation.

[0019] However, regarding measuring the temperature of a gas existing inside a furnace or the like, an acoustic gas thermometer has been proposed, which measures the temperature of the gas by measuring an acoustic signal that enters a receiving-side microphone from a transmitting-side microphone through the gas inside a resonator. The invention according to the first feature can measure the temperature of the high-temperature gas using the frequency of self-excited vibration generated by a temperature gradient. Thus, the invention according to the first feature can measure the temperature of the high-temperature gas without consuming the energy of an input acoustic signal as in the case of an acoustic gas thermometer. Further, the invention according to the first feature can measure the temperature of the high-temperature gas even at a high temperature where it is difficult to dispose a microphone.

[0020] Therefore, the invention according to the first feature can reduce the influence of thermal radiation in the case of measuring the temperature of a gas inside a furnace or the like.

[0021] The invention according to the second feature provides a measuring device, which is the invention according to the first feature, further including a thermometer that can be disposed inside the high-temperature gas and at least a part of which is opaque, and the processor can further execute: a third temperature acquisition process of acquiring a third temperature measured by the thermometer; and a thermal radiation estimation process of estimating a heat transfer to the thermometer caused by thermal radiation based on the second temperature and the third temperature.

[0022] The invention according to the second feature compares the third temperature measured by the thermometer that is affected by thermal radiation due to being opaque with the second temperature measured by a unit in which the influence of thermal radiation is reduced, whereby the heat transfer to the thermometer caused by thermal radiation can be estimated. Through this estimation, for example, the temperature measured by a thermometer provided outside the measuring device of the present invention can be calibrated by this estimation. Therefore, the influence of thermal radiation in measurement can also be reduced in a thermometer provided outside the measuring device of the present invention.

[0023] Therefore, the invention according to the second feature can reduce the influence of thermal radiation in the case of measuring the temperature of a gas inside a furnace or the like.

[0024] The invention of the third feature provides a measuring device, which is the invention of the first or second feature, wherein a heat exchanger that is substantially transparent and is connected to the part of the container and can transfer the heat of the high-temperature gas to the working fluid is disposed between the first end portion and the heat accumulator inside the pipeline.

[0025] According to the invention of the third feature, the temperature difference between the working fluid existing between the first end portion and the heat accumulator and the high-temperature gas becomes smaller and smaller through the heat exchanger. Since the heat exchanger is substantially transparent, the influence of radiation can be reduced. Thus, the invention of the fourth feature can estimate the temperature of the high-temperature gas more accurately.

[0026] Therefore, the invention of the third feature can reduce the influence of thermal radiation when measuring the temperature of a gas inside a furnace or the like.

[0027] The invention of the fourth feature provides a measuring device, which is the invention of any one of the first to third features, wherein the material of the substantially transparent part includes quartz glass.

[0028] According to the invention of the fourth feature, since quartz glass with excellent heat resistance and transparency is used as the material of the transparent part, the influence of thermal radiation when measuring the temperature of a gas inside a furnace or the like is further reduced. Since quartz glass has excellent durability at high temperatures, the durability of the measuring device 1 in measuring the temperature of high-temperature gases that may be accompanied by rapid temperature changes exemplified by the atmosphere gas inside a heating furnace or the like can be improved.

[0029] Therefore, the invention of the fourth feature can reduce the influence of thermal radiation when measuring the temperature of a gas inside a furnace or the like.

[0030] The invention of the fifth feature provides a measuring device, which is the invention of any one of the first to fourth features, wherein the material of the substantially transparent part includes sapphire glass.

[0031] According to the invention of the fifth feature, since sapphire glass with excellent heat resistance and transparency is used as the material of the transparent part, the influence of thermal radiation when measuring the temperature of a gas inside a furnace or the like is further reduced. Since sapphire glass has excellent transparency to infrared rays, the influence of thermal radiation can be further reduced. Since sapphire glass has excellent heat resistance above 1000 °C, the temperature of higher-temperature gases can be measured.

[0032] Therefore, the invention of the fifth feature can reduce the influence of thermal radiation when measuring the temperature of a gas inside a furnace or the like.

[0033] Effects of the Invention

[0034] The present invention can reduce the influence of thermal radiation when measuring the temperature of a gas inside a furnace or the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a block diagram schematically showing the hardware structure and software structure of the measuring device 1 of the present embodiment.

[0036] Figure 2 is a schematic diagram showing a situation where the measuring device 1 of the present embodiment is installed on the furnace F.

[0037] Figure 3 is a diagram schematically showing the movement of heat around the container transparent portion 12T.

[0038] Figure 4 is a main flowchart showing an example of a preferred process of the temperature measurement process of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0039] Hereinafter, an example of a preferred mode for implementing the present invention will be described with reference to the drawings. Note that this is only an example, and the technical scope of the present invention is not limited thereto.

[0040] <Measuring device 1>

[0041] Figure 1 is a block diagram schematically showing the hardware structure and software structure of the measuring device 1 of the present embodiment. Figure 2 is a schematic diagram showing a situation where the measuring device 1 of the present embodiment is installed on the furnace F. The measuring device 1 of the present embodiment includes a processor 11 and a container 12, and the container 12 has a pipe 12P capable of substantially closing both ends therein.

[0042] 〔Processor 11〕

[0043] As a software component, the processor 11 is not particularly limited as long as it can implement the first temperature acquisition unit 111, frequency acquisition unit 112, and temperature estimation unit 113 described later. The processor 11 is configured to include, for example, one or more of a CPU, GPU, FPGA, CPLD, and PLD. Later, Figure 3 the above various software components will be described in more detail.

[0044] The processor 11 is configured to be able to communicate with at least the temperature measurement unit 16 and the frequency measurement unit 17. Preferably, the processor 11 is configured to be able to communicate with the pressure measurement unit 19 and / or the thermometer 20.

[0045] Preferably, as a software component, the processor 11 can also implement a third temperature acquisition unit 114 that can perform a third temperature acquisition process of acquiring the temperature (third temperature) of the working fluid measured by the thermometer 20.

[0046] In addition, preferably, as a software component, the processor 11 can also implement a heat radiation estimation unit 115 that can perform a heat radiation estimation process of estimating the heat transfer to the thermometer 20 caused by heat radiation using the third temperature and the like.

[0047] Since the third temperature acquisition unit 114 and the heat radiation estimation unit 115 can be implemented, the measuring device 1 can estimate the heat transfer to the thermocouple thermometer caused by heat radiation. Through this estimation, for example, the temperature measured by the thermocouple thermometer provided other than the measuring device 1 of the present invention can be calibrated by this estimation. Therefore, in the thermocouple thermometer provided other than the measuring device 1 of the present invention, the influence of heat radiation during measurement can also be reduced.

[0048] Preferably, as a software component, the processor 11 can also implement an output unit 116 that can perform an output process of outputting the results of temperature estimation processing, heat radiation estimation processing, and the like. The output process is not particularly limited. For example, it can be a process of being able to acquire a data packet representing the result from the outside, a process of instructing the result display to various display devices, a process of instructing the printing of the result to various printing devices, and the like.

[0049] [Container 12]

[0050] The container 12 can be disposed so as to span between the high-temperature gas and the outside of the high-temperature gas. When the high-temperature gas is the atmosphere gas inside a high-temperature heat source such as a furnace F, preferably, the container 12 can be disposed so as to span between the high-temperature heat source and the outside of the high-temperature heat source ( Figure 2 ). Hereinafter, the high-temperature heat source is also simply referred to as "furnace F, etc.".

[0051] The container 12 has a pipeline 12P inside, which is delimited by the inner wall of the container 12 and the like and can substantially enclose both ends. The working fluid can be enclosed inside the pipeline 12P, and a heat accumulator 14 and a cooling unit 15 are arranged in sequence from the first end 12E1 to the second end 12E2 of the pipeline 12P. The first end 12E1 can be disposed inside the high-temperature gas. Preferably, a heat exchanger 13 is further arranged between the first end 12E1 and the heat accumulator 14 inside the pipeline 12P.

[0052] [Container transparent part 12T]

[0053] The transparent part 12T of the container is a part of the container 12 and is a substantially transparent part including at least the first end portion 12E1. When the container 12 is disposed so as to span between a high-temperature heat source and the outside of the high-temperature heat source, it is preferable that the transparent part 12T of the container includes the part of the container 12 corresponding to the high-temperature heat source. Thereby, the situation where the part of the container 12 corresponding to the high-temperature heat source becomes a temperature higher than the high-temperature gas due to thermal radiation is reduced.

[0054] The transparent part 12T of the container may be substantially the same as the part of the container 12 corresponding to the high-temperature heat source, or may include, in addition to the part of the container 12 corresponding to the high-temperature heat source, the part of the container 12 corresponding to the outside of the high-temperature heat source. The transparent part 12T of the container may also be constituted by an existing transparent member having heat resistance exemplified by a sheath material of a thermocouple thermometer, a light heating lamp tube, a quartz glass test tube, or the like.

[0055] Since the transparent part 12T of the container is substantially the same as the part of the container 12 corresponding to the high-temperature heat source, the part using the transparent material can be minimized. Thereby, the container 12 that uses more opaque materials, which are more excellent in mechanical properties and economic properties than the transparent material, can be constituted.

[0056] Since the transparent part 12T of the container includes the part of the container 12 corresponding to the outside of the high-temperature heat source, the structure of the container 12 becomes easy. In addition, when the transparent part 12T of the container is substantially the whole of the container 12, the container 12 without a step between the transparent part 12T and the opaque part can be constituted. Thereby, it is possible to prevent the step from becoming an obstacle to the self-excited vibration of thermoacoustics.

[0057] Figure 3 It is a diagram schematically showing the movement of heat around the transparent part 12T of the container. Inside the furnace F, heat can move to the thermometer 20 or the like by thermal radiation from the inner wall of the furnace F and heat conduction from the high-temperature gas.

[0058] In the opaque thermometer 20, in addition to the heat conduction from the high-temperature gas (the first heat conduction TCa), the thermal radiation from the inner wall of the furnace F (the first thermal radiation TRa) becomes the main cause of raising the temperature of the thermometer 20. Therefore, there is a concern that the temperature of the thermometer 20 becomes higher than the high-temperature gas due to thermal radiation.

[0059] On the other hand, in the measuring device 1 of the present embodiment, the part existing inside the furnace F as the high-temperature heat source is the substantially transparent transparent part 12T of the container. Therefore, in addition to a part of the thermal radiation (the second thermal radiation TRb) that reaches the heat accumulator 14 through the transparent part 12T, most of the thermal radiation from the inner wall of the furnace F (the third thermal radiation TRc, the fourth thermal radiation TRd) passes through the container 12 without raising the temperature of the container 12 or the like.

[0060] Therefore, the main reason for increasing the temperature of the container 12 is heat conduction from the high-temperature gas to the container 12 (the second heat conduction TCb). The container 12 that has reached approximately the same temperature as the high-temperature gas through the second heat conduction TCb causes the temperature of the working fluid to be approximately the same as the temperature of the high-temperature gas through heat conduction from the container 12 to the working fluid (the third heat conduction TCc).

[0061] Therefore, in the measuring device 1 of the present embodiment, compared with the case of using an opaque thermometer, it is considered that the case where the portion of the container 12 corresponding to the high-temperature heat source becomes a higher temperature than the high-temperature gas due to thermal radiation is reduced.

[0062] [Material of the container 12]

[0063] The figure referred to returns to Figure 2 . The material of the container 12 includes a transparent material that is substantially transparent in the transparent portion 12T of the container. The material of the container 12 may also include an opaque material in addition to the transparent portion 12T of the container.

[0064] The transparent material is not particularly limited as long as it is substantially transparent at the temperature of the high-temperature gas that is the measurement object of the measuring device 1. Examples of the transparent material include quartz glass and sapphire glass.

[0065] Regarding transparency, it is preferable that the transparent material is substantially transparent to visible light. Regarding being substantially transparent to visible light, the visible light transmittance of the transparent material measured by the test method specified in JIS R 3106:2019 is preferably 80% or more, and more preferably 90% or more. Thereby, heat transfer from the furnace F or the like to the transparent portion 12T of the container due to thermal radiation is further prevented.

[0066] Regarding transparency, it is preferable that the transparent material is substantially transparent to infrared rays. Regarding being substantially transparent to infrared rays, the spectral transmittance of the transparent material to infrared rays with a wavelength of 2.5 μm measured by the test method specified in JIS R 3106:2019 is preferably 50% or more, and more preferably 70% or more. Thereby, heat transfer from the furnace F or the like to the transparent portion 12T of the container due to thermal radiation is further prevented.

[0067] Regarding heat resistance, the deformation point of the transparent material measured by the test method specified in JIS R 3103-2:2001 is preferably 600°C or higher, and more preferably 800°C or higher. Thereby, deformation of the transparent portion 12T of the container when heated to the temperature of the high-temperature gas is prevented.

[0068] Regarding heat resistance, the coefficient of thermal expansion at 500 °C measured by the test method specified in JIS R 3102-1995 for the transparent material is preferably 100×10 -7 / °C or less, more preferably 10×10 -7 / °C or less. Thereby, breakage due to thermal expansion of the transparent part 12T of the container when heated to the temperature of the high-temperature gas is prevented.

[0069] The transparent material preferably includes fused quartz. Fused quartz can meet various requirements regarding the above-mentioned transparency and heat resistance. Since fused quartz with excellent heat resistance and transparency is used as the transparent material, the influence of thermal radiation is further reduced when measuring the temperature of the gas inside the furnace F or the like. Since fused quartz has excellent durability at high temperatures, the durability of the measuring device 1 in measuring the temperature of high-temperature gases that may be accompanied by rapid temperature changes exemplified by the atmosphere gas inside the heating furnace can be improved.

[0070] The transparent material preferably includes sapphire glass. Sapphire glass can meet various requirements regarding the above-mentioned transparency and heat resistance. Sapphire glass is particularly excellent in meeting various requirements regarding transparency. Since sapphire glass with excellent heat resistance and transparency is used as the transparent material, the influence of thermal radiation is further reduced when measuring the temperature of the gas inside the furnace F or the like. Since sapphire glass has excellent transparency to infrared rays, the influence of thermal radiation can be further reduced. Since sapphire glass has excellent heat resistance above 1000 °C, the temperature of higher-temperature gases can be measured.

[0071] The opaque material is not particularly limited. Examples of the opaque material include stainless steel, nickel alloy, cobalt alloy, heat-resistant ceramics, etc. For stainless steel, for example, austenitic stainless steel is selected from the viewpoint of corrosion resistance. For nickel alloy, for example, nickel-chromium-tungsten-molybdenum alloys such as Haynes 230 alloy (registered trademark), nickel-chromium-aluminum-iron alloys, nickel-cobalt-chromium-molybdenum-aluminum alloys, etc. are selected from the viewpoints of corrosion resistance and heat resistance. Haynes 230 alloy is also called MA23 alloy.

[0072] [Shape of the pipeline 12P]

[0073] The shape of the pipeline 12P is not particularly limited. Examples of the shape of the pipeline 12P include a substantially straight shape, a shape including a bent portion, etc.

[0074] Since the shape of the pipeline 12P is substantially linear, the situation where the phase of the self-excited vibration of thermoacoustics deviates in the bent portion and the self-excited vibration is weakened can be reduced. When the shape of the pipeline 12P includes a bent portion, the bent portion is preferably shaped such that it does not include a portion with a sharp bending angle that can impede the transmission of the self-excited vibration of thermoacoustics.

[0075] (Capable of connecting the temperature measurement unit 16, etc.)

[0076] The shape of the pipeline 12P is preferably a shape having holes and / or branch pipes capable of connecting various measurement units such as the temperature measurement unit 16, frequency measurement unit 17, and pressure measurement unit 19, which are disposed inside the pipeline 12P, described later. Thereby, the measuring device 1 can measure various parameters of the working fluid. The number of holes and / or branch pipes is not particularly limited and may be single or multiple.

[0077] The shape of the pipeline 12P is preferably a shape having holes and / or branch pipes capable of connecting the pressure change unit 18, described later. Thereby, the pressure change unit 18 can be connected to the pipeline 12P, and the pressure of the working fluid enclosed inside the pipeline 12P can be changed. The number of holes and / or branch pipes is not particularly limited and may be single or multiple.

[0078] (Dimensions of the pipeline 12P)

[0079] The length of the pipeline 12P is not particularly limited. The length of the pipeline 12P can be appropriately set according to the space where the measuring device 1 is disposed, etc.

[0080] The cross-sectional area of the pipeline 12P is not particularly limited. The cross-sectional area of the pipeline 12P can be appropriately set according to the space where the measuring device 1 is disposed, etc.

[0081] From the viewpoint of performing measurement without reducing the temperature of the high-temperature gas, the upper limit of the cross-sectional area of the pipeline 12P is preferably 40 cm 2 Hereinafter, more preferably 10 cm 2 Hereinafter. From the viewpoint of suppressing the interference between the inner wall of the pipeline 12P and the working fluid, the lower limit of the cross-sectional area of the pipeline 12P is preferably 0.5 cm 2 or more, more preferably 3 cm 2 or more.

[0082] [Method of disposing various components inside the pipeline 12P]

[0083] Various components such as the heat exchanger 13, the heat accumulator 14, the cooling unit 15, the temperature measurement unit 16, the frequency measurement unit 17, and the pressure measurement unit 19 are preferably installed by inserting them from the second end portion 12E2 of the pipeline 12P. Thus, even if the container 12 is made of a material difficult to process such as quartz glass or sapphire glass, various components can be disposed inside the pipeline 12P.

[0084] The positions of various components relative to the container 12 can be fixed either by a closing member 12C that closes the second end portion 12E2 or by using friction between the components and the container 12, etc. As a method of fixing the position relative to the container 12 by the closing member 12C, for example, a method of fixing various components by a rod-shaped member (not shown) connected to the closing member 12C can be cited. The rod-shaped member is, for example, a rod-shaped member with thread teeth cut. As a method of fixing using friction, etc., for example, a method of providing a taper (not shown) corresponding to each component inside the pipeline 12P and fixing various components by this taper can be cited.

[0085] [Working fluid]

[0086] (Type of working fluid)

[0087] The working fluid is not particularly limited. As the working fluid, for example, gases including air, humid air, inert gases, etc. can be cited.

[0088] Among them, the working fluid preferably includes air. Since it is a working fluid with less impact on the environment when leaking and contains air that is easily supplied, the adverse impact of the operation of the measuring device 1 on the environment and the cost related to the operation can be reduced.

[0089] The working fluid can include inert gases exemplified by nitrogen, helium, neon, argon, xenon, etc. Thereby, oxidation and corrosion of the pipeline 12P and each component disposed inside the pipeline 12P can be suppressed, and it can be expected that the self-excited vibration generated by the heat accumulator 14 will be stronger than the case where air is used as the working fluid.

[0090] The working fluid can include air (humid air) having a substance that can move back and forth between the gas phase and the liquid phase between the temperature of the high-temperature heat source and the temperature of the heat medium described later. As such a substance, for example, water, ethanol, etc. can be cited. Since the working fluid includes humid air, it can be expected that the self-excited oscillation generated by the heat accumulator 14 will be stronger than the case where air is used as the working fluid.

[0091] (Pressure of working fluid)

[0092] When the working fluid is air, the lower limit of the pressure of the working fluid during measurement is not particularly limited. For example, this lower limit is preferably 0.3 MPa or more, more preferably 0.4 MPa or more, and still more preferably 0.5 MPa or more. Hereinafter, the lower limit of the pressure of the working fluid during measurement is also simply referred to as the "first pressure". By setting the first pressure as described above, the heat accumulator 14 can generate stronger self-excited vibrations with frequencies that are easy to measure.

[0093] 〔Heat exchanger 13〕

[0094] The heat exchanger 13 transfers the heat of the high-temperature gas to the working fluid. The heat exchanger 13 is not particularly limited as long as it obtains the heat that the container 12 has obtained from the high-temperature gas through heat conduction from the container 12 to the heat exchanger 13 and transfers the received heat to the working fluid through heat conduction.

[0095] Like the container transparent part 12T, the heat exchanger 13 is preferably substantially transparent. The effects of the heat exchanger 13 being substantially transparent and the material of the heat exchanger 13 are the same as those of the container transparent part 12T.

[0096] For example, the heat exchanger 13 can transfer heat to the working fluid either through a plate connected to the pipeline 12P or through a rod-shaped member connected to the pipeline 12P.

[0097] The heat exchanger 13 can be configured separately from the container 12 or can be connected to the container 12 and substantially configured as one body. Here, a certain component "being connected to the container 12 and substantially configured as one body" means that, when the measuring device 1 performs measurement, this component and the container 12 etc. delimit the pipeline 12P integrally.

[0098] [Position where the heat exchanger 13 is disposed]

[0099] The position where the heat exchanger 13 is disposed is not particularly limited as long as it is a position where the heat exchanger 13, the heat accumulator 14, and the cooling unit 15 are disposed in sequence from the first end portion 12E1 of the pipeline 12P toward the second end portion 12E2, and it is a position where the heat of the high-temperature gas can be transferred to the working fluid. As such a position, for example, when the measuring device 1 is disposed so as to straddle between the high-temperature gas and the outside of the high-temperature gas, the position of the pipeline 12P corresponding to the part (container transparent part 12T) of the container 12 that becomes the periphery of the high-temperature gas ( Figure 2 ).

[0100] Among them, the position where the heat exchanger 13 is disposed is preferably near the heat accumulator 14. Thereby, the heat exchanger 13 can make the temperature of the working fluid existing around one end of the heat accumulator 14 higher than the case where this position is not near the heat accumulator 14.

[0101] The upper limit of the distance between the end of the heat exchanger 13 near the regenerator 14 and the end of the regenerator 14 near the heat exchanger 13 is preferably 1 / 40 or less of the length of the pipeline 12P, more preferably 1 / 70 or less of the length of the pipeline 12P, and still more preferably 1 / 200 or less of the length of the pipeline 12P. Thereby, the heat exchanger 13 can further increase the temperature of the working fluid existing around one end of the regenerator 14.

[0102] [Dimensions of the heat exchanger 13]

[0103] The length of the heat exchanger 13 in the direction along the pipeline 12P is not particularly limited. The lower limit of this length is preferably 2 / 100 or more of the length of the pipeline 12P, more preferably 3 / 100 or more of the length of the pipeline 12P. Thereby, the heat exchanger 13 can further increase the temperature of the working fluid existing around one end of the regenerator 14.

[0104] The upper limit of the length of the heat exchanger 13 in the direction along the pipeline 12P is preferably 30 / 100 or less of the length of the pipeline 12P, more preferably 25 / 100 or less of the length of the pipeline 12P. Thereby, the situation where the heat exchanger 13 has various undesirable effects on the self-excited vibration of the thermoacoustics can be reduced.

[0105] [Regenerator 14]

[0106] The regenerator 14 is a component that can generate self-excited vibration of thermoacoustics according to the temperature gradient. The shape of the regenerator 14 is substantially columnar. The regenerator 14 includes voids that communicate with each other in the direction along the pipeline 12P. That is, the regenerator 14 includes voids that connect the side closer to the first end portion 12E1 when viewed from the regenerator 14 and the other side closer to the cooling unit 15 when viewed from the regenerator 14.

[0107] Since the shape of the regenerator 14 is substantially columnar, the regenerator 14 is easily disposed inside the pipeline 12P. Since the shape of the regenerator 14 is substantially columnar, the regenerator 14 can generate self-excited vibration of thermoacoustics in the direction along the pipeline 12P at the planar both end portions.

[0108] When the above-described voids are provided in the pipeline 12P of the measuring device 1 with the regenerator 14 disposed therein, the voids can connect the periphery of the high-temperature portion in the pipeline 12P and the periphery of the low-temperature portion in the pipeline 12P. Here, the high-temperature portion is the high-temperature portion brought about by the heat transferred from the high-temperature gas by the heat exchanger 13. Therefore, the periphery of the high-temperature portion is, for example, the periphery of the heat exchanger 13. In addition, here, the low-temperature portion is the low-temperature portion brought about by the heat transfer in the cooling unit 15. Therefore, the periphery of the low-temperature portion is, for example, the periphery of the cooling unit 15.

[0109] When the regenerator 14 is disposed in the pipeline 12P of the measuring device 1, it includes a void that communicates with the regenerator 14 along the direction of the pipeline 12P. Thus, when the regenerator 14 is disposed in the pipeline 12P, it can generate self-excited oscillation of thermoacoustics according to the temperature gradient generated inside the regenerator 14 due to the temperature difference between the high-temperature part and the low-temperature part.

[0110] The regenerator 14 can be configured separately from the container 12 or can be substantially integrated with the container 12.

[0111] [Flow path radius of the void]

[0112] The flow path radius d [m] of the void preferably satisfies the relationship of the following formula (1) with respect to the thickness δ [m] of the thermal boundary layer of the working fluid related to the self-excited oscillation of thermoacoustics generated in the regenerator 14. More specifically, (d / δ) 2 is preferably in the range of 0.1 to 10.

[0113]

Formula 1

[0114]

[0115] [Length of the regenerator 14 along the pipeline 12P]

[0116] The lower limit of the length of the regenerator 14 along the pipeline 12P is preferably 9% or more, more preferably 13% or more of the length of the pipeline 12P (pipeline length). Thus, it can be expected that a part of the regenerator 14 also functions as a heat exchanger. Therefore, it is expected to generate stronger and easier-to-measure self-excited oscillation.

[0117] [Material of the regenerator 14]

[0118] The material of the regenerator 14 is not particularly limited. The material of the regenerator 14 includes, for example, one or more of metal materials such as stainless steel, inorganic materials such as ceramics, and thermally conductive anisotropic materials such as graphite sheets.

[0119] Regarding the material of the regenerator 14, in the measuring device 1 for measuring the temperature of a high-temperature gas, heat resistance of the regenerator 14 is required.

[0120] When the material of the regenerator 14 includes an inorganic material, the regenerator 14 can be configured, for example, as a porous body formed by sintering an inorganic material such as a ceramic honeycomb. Thus, a regenerator 14 with excellent heat resistance and corrosion resistance at high temperatures can be achieved.

[0121] [Position where the regenerator 14 is disposed]

[0122] The position where the heat accumulator 14 is disposed is preferably a position where the relative position of the heat accumulator satisfies the following conditions, in addition to being a position where the heat accumulator 14 and the cooling unit 15 are sequentially disposed from the first end portion 12E1 to the second end portion 12E2 of the pipeline 12P. Here, the relative position of the heat accumulator is a ratio obtained by dividing the distance along the pipeline 12P from the first end portion 12E1 of the pipeline 12P to the center of the heat accumulator 14 by the length of the pipeline 12P. In addition, the position where the heat accumulator 14 is disposed is preferably a position where heat radiation from the furnace F or the like does not enter the heat accumulator 14 in a direction perpendicular to the direction of the pipeline 12P.

[0123] The lower limit of the relative position of the heat accumulator is preferably 2 / 25 or more, more preferably 3 / 25 or more, and further preferably 4 / 25 or more. In addition, the upper limit of the relative position of the heat accumulator is preferably 9 / 25 or less, more preferably 8 / 25 or less, and further preferably 7 / 25 or less. Thereby, it is possible to balance the suppression of the movement of heat from the high-temperature gas caused by self-excited vibration and the generation of stronger and more easily measurable self-excited vibration.

[0124] 〔Cooling Unit 15〕

[0125] The cooling unit 15 is a cooling component capable of cooling the working fluid. The cooling unit 15 is not particularly limited. The cooling unit 15 may be separately configured from the container 12 or may be substantially integrally formed with the container 12. In addition, the cooling unit 15 may be configured to include a component provided outside the container 12 and a part inside the pipeline 12P that is cooled by the component and cools the working fluid.

[0126] [Mode of Cooling Unit 15]

[0127] The cooling unit 15 is preferably a gas-liquid heat exchanger that uses a liquid as the heat medium. Thereby, the cooling unit 15 can use a liquid with a specific heat greater than that of a gas to cool the working fluid.

[0128] The heat medium in the form of a liquid is preferably mainly composed of water. The heat medium mainly composed of water can utilize the high specific heat of water in the heat medium and can prevent the heat medium from affecting the environment. In addition, thereby, the supply of the heat medium can be made easier.

[0129] The mode of the cooling unit 15 as a gas-liquid heat exchanger is not particularly limited. As such a mode, for example, a shell-and-tube gas-liquid heat exchanger, a finned-tube gas-liquid heat exchanger, a flat-tube non-finned gas-liquid heat exchanger, a coil-type gas-liquid heat exchanger, etc. can be cited.

[0130] Among them, as the cooling unit 15 of the gas-liquid heat exchanger, a shell-and-tube gas-liquid heat exchanger is preferably used. The shell-and-tube gas-liquid heat exchanger is configured such that the tubes through which the working fluid passes along the direction of the pipeline 12P pass through the inside of the shell through which the heat medium can flow. The cooling unit 15 of the shell-and-tube gas-liquid heat exchanger can take into account reducing the pressure loss in the working fluid and improving the efficiency of cooling the working fluid.

[0131] When the container transparent portion 12T is substantially the whole of the container 12, as the cooling unit 15 of the gas-liquid heat exchanger, a tube-type gas-liquid heat exchanger composed of tubes through which the heat medium can flow is preferably used. Thus, the cooling unit 15 can be disposed inside the pipeline 12P without providing holes or the like in the container transparent portion 12T.

[0132] [Position where the cooling unit 15 is disposed]

[0133] The position where the cooling unit 15 is disposed is not particularly limited as long as it is a position where the heat accumulator 14 and the cooling unit 15 are sequentially disposed from the first end portion 12E1 to the second end portion 12E2 of the pipeline 12P and can cool the working fluid. As such a position, for example, the position of the pipeline 12P corresponding to the portion of the container 12 that becomes the outer periphery of the furnace F or the like when the measuring device 1 is disposed so as to straddle between the furnace F or the like and the outside of the furnace F or the like can be cited ( Figure 2 ).

[0134] Among them, the position where the cooling unit 15 is disposed is preferably near the heat accumulator 14. Thus, the cooling unit 15 can make the temperature of the working fluid existing around one end of the heat accumulator 14 lower than the case where this position is not near the heat accumulator 14.

[0135] The upper limit of the distance between the end portion of the cooling unit 15 close to the heat accumulator 14 and the end portion of the heat accumulator 14 close to the cooling unit 15 is preferably 1 / 40 or less of the length of the pipeline 12P, more preferably 1 / 70 or less of the length of the pipeline 12P, and further preferably 1 / 200 or less of the length of the pipeline 12P. Thus, the cooling unit 15 can further reduce the temperature of the working fluid existing around one end of the heat accumulator 14.

[0136] [Temperature measuring unit 16]

[0137] The temperature measuring unit 16 is a component disposed between the heat accumulator 14 and the second end portion 12E2 and capable of measuring the temperature (first temperature) of the working fluid. That is, the temperature measuring unit 16 can measure the temperature (first temperature) of the working fluid between the heat accumulator 14 and the second end portion 12E2.

[0138] The temperature measurement unit 16 is not particularly limited as long as it can provide the measurement result to the processor 11. The temperature measurement unit 16 includes, for example, one or more of a thermocouple thermometer, a constant-volume gas thermometer, an acoustic gas thermometer, a thermal noise thermometer, a radiation thermometer, a metal resistance thermometer, a semiconductor resistance thermometer, etc.

[0139] The temperature measurement unit 16 is disposed between the heat accumulator 14 and the second end portion 12E2. That is, the temperature measurement unit 16 is disposed outside the high-temperature heat source and the high-temperature gas. Therefore, the temperature measurement unit 16 is not affected by the radiation from the high-temperature heat source. In addition, thereby, a temperature measurement unit 16 whose operating temperature range does not include the temperature of the high-temperature gas can be disposed.

[0140] 〔Frequency measurement unit 17〕

[0141] The frequency measurement unit 17 is a component that is disposed between the heat accumulator 14 and the second end portion 12E2 and can measure the frequency of the self-excited vibration of the thermoacoustic in the working fluid. That is, the frequency measurement unit 17 can measure the frequency of the self-excited vibration of the thermoacoustic that is generated in the heat accumulator 14 and becomes a standing wave in the pipeline 12P.

[0142] The frequency measurement unit 17 is disposed between the heat accumulator 14 and the second end portion 12E2. That is, the frequency measurement unit 17 is disposed outside the high-temperature heat source and the high-temperature gas. Thereby, a frequency measurement unit 17 whose operating temperature range does not include the temperature of the high-temperature gas can be disposed.

[0143] 〔Pressure change unit 18〕

[0144] The measuring device 1 preferably includes a pressure change unit 18 that can control the pressure of the working fluid enclosed inside the pipeline 12P. The pressure change unit 18 is configured to at least include a pressurizing unit that can increase the pressure of the working fluid.

[0145] [Pressurizing unit]

[0146] The pressurizing unit is not particularly limited. As the pressurizing unit, for example, a compressor that can be connected to the pipeline 12P can be cited. The pressure change unit 18 includes a pressurizing unit, and thereby, according to an instruction to increase the heat transfer amount, control to increase the pressure of the working fluid can be performed so that the heat accumulator 14 enhances self-excited vibration.

[0147] It is known that the generation of the self-excited vibration of the thermoacoustic in the heat accumulator 14 is affected by the pressure of the working fluid. However, the generation of self-excited vibration in the air near normal pressure is relatively weak. In the case of generating such a weak self-excited vibration, the thermoacoustic in the pipeline decreases due to the resistance caused by the viscosity of the air, etc.

[0148] Since the pressure change unit 18 is configured to include a pressurizing unit, the pressure of the working fluid can be increased from the atmospheric pressure or a pressure below the above-mentioned first pressure to a pressure above the above-mentioned second pressure. Thus, even if the working fluid is air, the regenerator 14 can generate or enhance the self-excited oscillation of thermoacoustics.

[0149] 〔Pressure measurement unit 19〕

[0150] The pressure measurement unit 19 is a component capable of measuring the pressure of the working fluid. By including the pressure measurement unit 19, the measuring device 1 can measure the temperature of the high-temperature gas even when the pressure is changed by the pressure change unit 18.

[0151] The pressure measurement unit 19 can be arranged between the regenerator 14 and the second end portion 12E2. That is, the pressure measurement unit 19 can be arranged outside the high-temperature heat source and the high-temperature gas. Thus, the pressure measurement unit 19 with a working temperature range not including the temperature of the high-temperature gas can be arranged.

[0152] 〔Thermometer 20〕

[0153] The thermometer 20 is arranged inside the high-temperature gas and at least a part thereof is opaque. That is, the thermometer 20 can provide the temperature (third temperature) of the high-temperature gas measured by a unit affected by thermal radiation.

[0154] The thermometer 20 is not particularly limited as long as at least a part thereof is opaque and can provide the measurement result to the processor 11. The thermometer 20 includes, for example, one or more of a thermocouple thermometer, a metal resistance thermometer, a semiconductor resistance thermometer, etc.

[0155] 〔High-temperature heat source〕

[0156] The high-temperature heat source is not particularly limited as long as there is high-temperature gas to be measured inside. As the high-temperature heat source, for example, various heating furnaces such as a furnace F can be cited.

[0157] The high-temperature heat source preferably can reach 600 °C or more. Thus, the measuring device 1 can measure the temperature of the high-temperature gas even when the pressurized air is used as the working fluid.

[0158] The high-temperature heat source preferably can reach 800 °C or more. Thus, even when the measuring device 1 uses the pressurized air as the working fluid and the pressure of the air is relatively low, below 1 MPa, the measuring device 1 can measure the temperature of the high-temperature gas.

[0159] 〔Temperature measurement process〕

[0160] Figure 4This is a main flowchart showing an example of the preferred process of the temperature measurement process of the present embodiment. Hereinafter, use Figure 4 to illustrate an example of the preferred process of the temperature measurement process of the present embodiment.

[0161] [Step S1: Obtain the first temperature]

[0162] The processor 11 cooperates with the temperature measurement unit 16 to execute the first temperature acquisition unit 111. Then, the processor 11 performs a first temperature acquisition process of acquiring the first temperature measured by the temperature measurement unit 16 (step S1, first temperature acquisition step). The processor 11 moves the process to step S2.

[0163] [Step S2: Obtain the frequency]

[0164] The processor 11 cooperates with the frequency measurement unit 17 to execute the frequency acquisition unit 112. Then, the processor 11 performs a frequency acquisition process of acquiring the frequency of the working fluid measured by the frequency measurement unit 17 (step S2, frequency acquisition step). The processor 11 moves the process to step S3.

[0165] [Step S3: Estimate the second temperature]

[0166] The processor 11 executes the temperature estimation unit 113. Then, the processor 11 performs a temperature estimation process of estimating the temperature (second temperature) of the high-temperature gas based on the ratio of the length from one side of the heat accumulator 14 to the first end portion 12E1 to the length of the pipeline 12P, the first temperature obtained in step S1, and the frequency obtained in step S2 (step S3, temperature estimation step). The processor 11 moves the process to step S4.

[0167] The temperature estimation process is not particularly limited as long as it includes a process of estimating the second temperature based on the above ratio, first temperature, and frequency.

[0168] The following is an example of the step of estimating the temperature (second temperature) T H [K]. f 0 [Hz] is the frequency when the temperature of the working fluid inside the pipeline 12P corresponding to the container transparent portion 12T is the same as the temperature (first temperature) T L [K] of the working fluid between the heat accumulator 14 and the second end portion 12E2. In addition, the ratio r is the ratio of the length from one side of the heat accumulator 14 to the first end portion 12E1 to the length of the pipeline 12P.

[0169] At this time, the frequency f [Hz] when the temperature of the working fluid inside the pipeline 12P corresponding to a part of the above is substantially the same as the second temperature T H [K] is represented by the following formula (2), for example. Where cL [m / s] is the known speed of sound at the first temperature T L [K]. In addition, c H [m / s] is the known speed of sound at the second temperature T H [K].

[0170]

Equation 2

[0171]

[0172] Equation (3) is the formula for solving Equation (2) for c H .

[0173]

Equation 3

[0174]

[0175] If the known relationship between the temperature of the gas and the speed of sound in the gas is used, then T H [K] can be obtained from c obtained using Equation (3). The relationship between the temperature of the gas and the speed of sound in the gas is, for example, Equation (4). Here, κ is the specific heat ratio of the working fluid. In addition, R [J / K·mol] is the gas constant. M is the average molecular weight of the working fluid. H

[0176]

Equation 4

[0177]

[0178] Therefore, based on the ratio r of the length from one side of the heat accumulator 14 to the first end portion 12E1 to the length of the pipeline 12P, the first temperature T L [K], the frequency f [Hz], and f 0 [Hz] as a predetermined parameter, the second temperature T H [K] can be estimated.

[0179] As another example of the temperature estimation process, a process including the step of obtaining c H using the following Equation (5) instead of the above Equation (3) can be cited. Equation (5) approximately corresponds to the average sound speed c H in the pipeline 12P when the temperature of the working fluid inside a part of the pipeline 12P corresponding to the above is approximately the same as the second temperature T L [K], and is obtained by solving the relationship formula c H / f = c avg / f H for the frequency and sound speed of the standing wave based on this approximation. avg / f = c L / f 0 .

[0180]

Formula 5

[0181]

[0182] In addition to the steps exemplified, the temperature estimation process may also be a process including various steps of estimating the second temperature T based on the above ratio r, the first temperature T L and the frequency f. As such a process, for example, there may be cited a process of estimating the second temperature T using the correspondence relationship between the ratio r, the first temperature T H previously prepared using other thermometers, the frequency f, and the second temperature T L , a process of estimating the second temperature T using machine learning of the above correspondence relationship H , and the like. H Although not an essential method, the temperature measurement process preferably includes the thermal radiation estimation process of steps S4 to S5. Thus, for example, it is possible to calibrate the temperature measured by a thermometer provided in addition to the measurement device 1 of the present embodiment through this estimation. Therefore, the influence of thermal radiation during measurement can also be reduced in a thermometer provided in addition to the measurement device 1 of the present embodiment. H

[0183]

[0184] [Step S4: Obtain the third temperature]

[0185] The processor 11 cooperates with the thermometer 20 and executes the third temperature acquisition unit 114. Then, the processor 11 performs a third temperature acquisition process of acquiring the third temperature measured by the thermometer 20 (step S4, third temperature acquisition step). The processor 11 moves the process to step S5.

[0186] [Step S5: Estimate the heat transfer caused by thermal radiation]

[0187] The processor 11 executes the thermal radiation estimation unit 115. Then, the processor 11 performs a thermal radiation estimation process of estimating the heat transfer to the thermometer 20 caused by thermal radiation based on the second temperature estimated in step S3 and the third temperature acquired in step S4 (step S4, thermal radiation estimation step). The processor 11 moves the process to step S5.

[0188] The thermal radiation estimation process is not particularly limited. The thermal radiation estimation process may be, for example, a process including steps of estimating thermal radiation based on the difference between the fourth power of the second temperature and the fourth power of the third temperature, the surface area of the thermometer 20, the emissivity, the heat capacity, the shape factor, and the like.

[0189] [Step S6: Output the result]

[0190] The processor 11 executes the output unit 116. Then, the processor 11 performs output processing of the second temperature estimated in step S3 (step S6, output step). The processor 11 moves the process to step S1 and repeats steps S1 to S6.

[0191] In the case where the temperature measurement process includes the thermal radiation estimation process of steps S4 to S5, it is preferable that the output process further outputs the thermal radiation estimated in step S3.

[0192] [Self-excited vibration control process]

[0193] Although not an essential method, it is preferable that the temperature measurement process includes a self-excited vibration control process for controlling the intensity of self-excited vibration above the lower limit of the measurable frequency. The self-excited vibration control process can be, for example, a process of controlling to increase the pressure of the working fluid when the intensity of self-excited vibration is lower than the lower limit of the measurable frequency, and a process of controlling to decrease the pressure of the working fluid when the intensity of self-excited vibration exceeds the lower limit of the measurable frequency and exceeds a predetermined margin. Thus, the situation where the measuring device 1 transfers the thermal energy of the high-temperature gas to the outside such as the furnace F through strong self-excited vibration is reduced.

[0194] [Effect of temperature measurement process]

[0195] In the measuring device 1 of the present embodiment, the temperature of a part (container transparent part 12T) disposed inside the high-temperature gas is heated by heat conduction from the high-temperature gas. This part is substantially transparent. Therefore, it is prevented that the temperature of this part becomes higher than the temperature of the high-temperature gas due to thermal radiation. Thus, it is expected that the temperature of the working fluid inside the pipeline corresponding to this part is substantially the same as the temperature of the high-temperature gas.

[0196] Moreover, in the measuring device 1 of the present embodiment, the working fluid inside the pipeline 12P between the cooling unit 15 and the second end 12E2 is cooled by the cooling unit 15. Therefore, a temperature gradient in the direction along the pipeline 12P is generated from the first end 12E1 side of the heat accumulator 14 toward the cooling unit 15 side of the heat accumulator 14. Due to the temperature gradient in the direction along the pipeline 12P, the heat accumulator 14 generates self-excited vibration of thermoacoustics. Since both ends of the pipeline 12P are substantially closed, this self-excited vibration includes a standing wave in a closed pipe. The wavelength of the standing wave corresponds to the length of the pipeline 12P.

[0197] However, it is known that there is a relationship corresponding to the type of gas between the speed of sound and the temperature in the gas. When the speed of sound changes, the frequency corresponding to the wavelength also changes. In the case where the speed of sound of a part of the working fluid inside the pipeline 12P changes, the frequency corresponding to the wavelength changes according to the ratio of the changed part to the whole.

[0198] Therefore, if the above ratio, the temperature of the working fluid, and the frequency are used, the temperature of the working fluid inside the pipeline 12P corresponding to a part of the above can be calculated. Since a part of the above is substantially transparent, the temperature of the working fluid inside the pipeline 12P corresponding to a part of the above is prevented from becoming higher than the temperature of the high-temperature gas due to thermal radiation. That is, the temperature of the working fluid inside the pipeline 12P corresponding to a part of the above is less affected by thermal radiation and is expected to be approximately the same as the temperature of the high-temperature gas.

[0199] The temperature estimation process is a process that uses the above ratio, the temperature of the working fluid, and the frequency. Therefore, in the above temperature measurement process, the processor 11 can estimate the temperature (second temperature) T of the high-temperature gas while reducing the influence of thermal radiation by executing the first temperature acquisition process, the frequency acquisition process, and the temperature estimation process. H [K].

[0200] This temperature measurement process can be realized without disposing a thermocouple thermometer or the like inside the high-temperature gas. Thus, the measuring device 1 can be constituted by using a temperature measuring unit 16 whose operating temperature range does not include the temperature of the high-temperature gas. In addition, thus, the temperature measuring unit 16 can measure the temperature of the working fluid without being affected by thermal radiation.

[0201] In addition, an acoustic gas thermometer has been proposed, which measures the temperature of a gas by measuring an acoustic signal transmitted from a transmitting microphone and received by a receiving microphone via the gas inside a resonator. The temperature estimation process of the present embodiment can measure the temperature of the high-temperature gas by using the frequency of self-excited vibration generated by a temperature gradient. Thus, the measuring device 1 of the present embodiment can measure the temperature of the high-temperature gas without consuming the energy of the input acoustic signal like an acoustic gas thermometer.

[0202] In addition, the frequency of self-excited vibration can be measured from the working fluid cooled by the cooling member 15. Therefore, the measuring device 1 of the present embodiment can measure the temperature of the high-temperature gas even at a high temperature where it is difficult to dispose a microphone.

[0203] Therefore, the above temperature measurement process can reduce the influence of thermal radiation when measuring the temperature of a gas inside a furnace F or the like.

[0204] 〔Regarding the heat transfer device also serving as〕

[0205] The measuring device 1 of the present embodiment can also serve as a heat transfer device that transfers heat from the inside of a furnace F or the like to the outside. Thus, it is possible to take into account both the measurement of the temperature of a high-temperature gas and the transfer of heat in a limited space. When the measuring device 1 also serves as a heat transfer device, preferably, the above-described self-excited vibration control process includes control to increase the pressure of the working fluid, so as to increase the heat transfer amount caused by self-excited vibration as much as possible when performing heat transfer.

[0206] In addition, within the scope of the idea of the present invention, those skilled in the art can conceive of various modification examples and correction examples. Therefore, it can be understood that these modification examples and correction examples belong to the scope of the present invention. For example, for the above-described embodiment, those skilled in the art have appropriately added, deleted, or changed the design of components, or added, omitted, or changed the conditions of the process, as long as they have the gist of the present invention, they are included in the scope of the present invention.

[0207] Explanation of reference numerals

[0208] 1 Measuring device

[0209] 11 Processor

[0210] 111 First temperature acquisition unit

[0211] 112 Frequency acquisition unit

[0212] 113 Temperature estimation unit

[0213] 114 Third temperature acquisition unit

[0214] 115 Thermal radiation estimation unit

[0215] 116 Output unit

[0216] 12 Container

[0217] 12P Pipeline

[0218] 12E1 First end

[0219] 12E2 Second end

[0220] 12T Transparent part of the container

[0221] 13 Heat exchanger

[0222] 14 Heat accumulator

[0223] 15 Cooling unit

[0224] 16 Temperature measurement unit

[0225] 17 Frequency measurement unit

[0226] 18 Pressure change unit

[0227] 19 Pressure measurement unit

[0228] 20 Thermometer

[0229] F Furnace

[0230] TCa The a - th heat conduction

[0231] TCb The b - th heat conduction

[0232] TCc The c - th heat conduction

[0233] TRa The a - th thermal radiation

[0234] TRb The b - th thermal radiation

[0235] TRc The c - th thermal radiation

[0236] TRd The d - th thermal radiation.

Claims

1. A measuring device, characterized in that, it includes a processor and a container, and the container has a pipeline inside that can substantially enclose a first end and a second end, a part of the container including the first end is substantially transparent, the first end can be arranged inside the high-temperature gas, the inside of the pipeline can enclose a working fluid, and a heat accumulator and a cooling unit are arranged in sequence from the first end toward the second end, the heat accumulator has a void communicating with the heat accumulator along the direction of the pipeline, and can generate self-excited vibration of thermoacoustics through a temperature gradient along the direction of the pipeline, the cooling unit can cool the working fluid, the processor can execute temperature estimation processing, and the temperature estimation processing estimates the temperature (second temperature) of the high-temperature gas based on the ratio of the length from one side of the heat accumulator to the first end to the length of the pipeline, the temperature of the working fluid between the heat accumulator and the second end, and the frequency of the self-excited vibration.

2. The measuring device according to claim 1, characterized in that, it further includes a thermometer, the thermometer can be arranged inside the high-temperature gas, and at least a part of it is opaque, the processor can further execute: third temperature acquisition processing for acquiring a third temperature measured by the thermometer; and thermal radiation estimation processing for estimating the heat transfer to the thermometer caused by thermal radiation based on the second temperature and the third temperature.

3. The measuring device according to claim 1, characterized in that, connected to the part of the container, a heat exchanger that can transfer the heat of the high-temperature gas to the working fluid and is substantially transparent is arranged between the first end and the heat accumulator inside the pipeline.

4. The measuring device according to claim 1, characterized in that, the material of the substantially transparent part includes quartz glass.

5. The measuring device according to claim 1, characterized in that, the material of the substantially transparent part includes sapphire glass.

Images