JPH0348507Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a temperature measuring device, and more particularly to a temperature measuring device capable of measuring a temperature close to 1000° C. in a melting furnace, for example.

Conventionally, a thermocouple type temperature measuring device is known as a temperature measuring device capable of measuring such a high temperature range. On the other hand, targeting relatively low temperature range,
- As shown in Publication No. 154789, one end of the heat pipe is fixed to the temperature measuring part, the other end is placed in the atmosphere for natural air cooling, and the temperature measuring element is placed at the other end in the atmosphere. The thermometer of the configuration was installed.

However, when measuring an extremely high temperature range, such as when the temperature of the test object is about 1000° C. or higher, the former thermocouple type has a short lifespan.

In the latter heat pipe type, one end of the heat pipe is likely to be thermally damaged in a short period of time, and the temperature at the other end of the heat pipe is likely to fluctuate due to changes in the temperature of the furnace body or the atmosphere, for example. There was a great risk that the estimated temperature based on the temperature detected by the thermometer would deviate significantly from the true temperature of the subject, resulting in a large error.

In addition, in the case of a configuration in which the other end of the heat pipe is naturally cooled with air, as in the conventional example, depending on the temperature of the object and the type of heat medium, the heat medium may enter the gas phase at the other end of the heat pipe. There are cases where it is not possible to change from the liquid phase to the liquid phase. In this state, the function as a heat pipe is lost, and the temperature at the other end of the heat pipe becomes extremely unstable. It is not possible to make a good guess at the temperature of the object.

That is, this conventional example had problems in terms of durability and reliability of temperature measurement estimates.

Therefore, the purpose of this invention is to sufficiently suppress thermal damage to the temperature measuring device, and also to be able to measure temperature ranges as high as 1000℃, and to provide highly reliable measurement of the estimated temperature. The purpose is to obtain a heating device.

Therefore, the characteristic configuration of the present invention for a temperature measuring device in which a temperature measuring element is attached to a heat pipe at a location away from one end of the heat pipe to detect the skin temperature of the heat pipe is as follows: A drive device is provided to move one end of the heat pipe into and out of the temperature measurement section, a device is provided to forcefully cool the other end of the heat pipe to a constant temperature, and the temperature measurement element is positioned midway in the longitudinal direction of the heat pipe. Its functions and effects are as follows.

In other words, by operating the drive device, one end of the heat pipe is positioned at the temperature measurement section only when temperature measurement is necessary.
Other than that, it can be pulled out from the temperature measuring section, so even if the temperature measuring section is at a high temperature, thermal damage to the heat pipe can be suppressed to the necessary minimum.

In addition, a device that forcibly cools the other end of the heat pipe maintains it almost constant regardless of the ambient temperature.
Since the temperature of the heat pipe is detected by a temperature measuring element at the midpoint in the longitudinal direction of the heat pipe, even if the temperature of the furnace body, atmosphere, etc. changes greatly, the other end of the heat pipe can be set at a constant temperature, and this heat The temperature of the temperature measuring section can always be accurately estimated based on the information from the temperature measuring element at the intermediate position of the length of the pipe.

The main reason that conventional temperature measurement devices equipped with heat pipes perform detection at the other end is that there is almost no temperature gradient along the length of the heat pipe, and the temperature response is good. This is because it is possible to transfer the temperature state of This is intended to measure a relatively high temperature range with the temperature measuring device in a low temperature state.

In this manner, the temperature measuring device of the present application can sufficiently prevent durability deterioration due to thermal damage and can reliably estimate the temperature of the subject.

Next, an example will be shown with reference to FIGS. 1 and 2.

To configure a cupola-type melting furnace for melting industrial waste, a bottomed cylindrical furnace body 1 lined with refractory material is installed upright on a support 2, and a furnace bottom 3 of this furnace body 1 can be opened and closed freely. At the same time, industrial waste or intermediately processed materials (hereinafter referred to as treated materials) and carbon-based combustible substances such as coke are supplied into the furnace in a mixed state or alternately on the upper side of the furnace body 1. A hopper 4 with a two-stage damper is provided to form a high-temperature hearth 5 in the furnace with the carbon-based combustible material, and the exhaust gas temperature in the furnace is measured at the upper part of the high-temperature hearth 5. In addition, a slag outlet 7 is provided at the lower side of the furnace body 1 for taking out molten slag, and a tuyere 8 is provided for blowing oxygen-containing gas such as air into the high-temperature hearth 5. is provided to burn and melt the processed material in the high-temperature hearth 5, and to transport the generated exhaust gas from the duct 9 to the cyclone 1.
It is designed to be released into the atmosphere through 0.

The temperature measurement device 6 is configured by a bracket having a through hole 11 provided in the wall of the furnace body 1, and a rail provided on the outer plate 1a on the lower side of the through hole 11 along the axial direction of the through hole 11. 12, a heat pipe 15 is attached to the trolley 13 movable along the rails via a heat insulating material 14, and a heat pipe 15 is attached to one end side of the heat pipe 15 by moving relative to the heat pipe 15. A device 16 for removing deposits is fitted onto the outside and attached to the outer panel 1a.

A fin b is provided at the other end of the heat pipe 15, and the fin b is surrounded by a jacket 18 to which flexible cooling water supply and discharge pipes 17a and 17b are connected. A water-cooled cooling device 19 for forcibly cooling the end side is configured, and one end side of the heat pipe 15 is connected to the temperature measuring part C on the inner side of the furnace than the device 16 at the rear end of the jacket 18. A mechanism 21 is provided which connects a drive device 20 for moving the heat pipe 15 in and out, and detects the skin temperature of the heat pipe 15 at a portion covered by the heat insulating material 14.

The heat pipe 15 is made up of a heat-resistant metal pipe 23 with both ends closed, a porous material 22 pasted on the inner surface of the pipe 23, and a heat medium liquid sealed in the pipe 23. When one end side is set as heating part A and that part is heated,
The heat medium liquid evaporates and the heat medium vapor moves to the heat radiation part B on the other end side of the pipe 23, and in the heat radiation part B, the heat medium vapor is cooled to a constant temperature by the forced cooling device 19, and the heat medium vapor radiates heat. At the same time, it is surely condensed, becomes a heat transfer liquid, permeates into the porous material 22, and is returned to the heating section A by capillary action.The above cycle is repeated to transfer heat from the heating section A. It is configured to be continuously transported to the heat dissipation section B.

Therefore, in a situation where the heat reception energy in the heating section A is substantially constant and the cooling energy in the heat radiation section B is substantially constant, the skin temperature distribution in the longitudinal direction of the heat pipe 15 is determined. The relationship between the heat reception temperature in the heating section A and the skin temperature of the heat pipe 15 can be reproduced well even when the heat pipe is disposed at a predetermined position at different times, for example. Also, since the other end of the heat pipe is stably at a constant temperature, based on this, the heat pipe 1
5 is located in the temperature measuring section C of the furnace gas, and the temperature measuring element a of the temperature detecting mechanism 21 is located in a stable temperature region away from the cooling section by the cooling device, and the measured temperature value is measured. By adding temperature correction based on the correlation between the temperature of the object and the skin temperature of the heat pipe 15, the temperature of the exhaust gas in the furnace can be indirectly measured (estimated) in a good manner.

According to the above configuration, the temperature can be measured based on the skin temperature of the heat pipe 15, which is much lower than the temperature at the heating section A, and therefore,
Since the temperature detection mechanism 21 is hardly affected by heat, its thermal life can be greatly extended, and there is no need to consider heat resistance, which is economical.

Since the heat pipe 15 constantly circulates the heat medium liquid and constantly transports heat from the heating section A to the heat radiation section B, the heat pipe skin surface temperature of the heating section A is much higher than the gas temperature. As a result, the heat pipe 15 can be sufficiently durable for long-term practical use without considering the heat resistance of the material.

Here, the pressure state within the heat pipe varies depending on the temperature of the subject. That is, when a very high temperature range is targeted as described above, the internal pressure of the heat pipe increases and the boiling point of the heat medium also increases, thereby maintaining a mixed state of gas and liquid phases within the heat pipe.

In addition, by using an in/out operation for positioning one end of the heat pipe 15 in the temperature measurement part C when measuring the temperature, thermal durability can be further increased, which is highly economical.

Furthermore, by performing the above-mentioned opening/exiting operation, deposits on the surface of the heat pipe 15 can be automatically removed by the device 16, and the heat pipe 15 has a significantly higher thermal time constant than other heat conductors. Since it is small, its surface temperature tends to reach an equilibrium state quickly, and therefore,
Although heat resistance is improved by moving the heat pipe 15 in and out, interval temperature measurement with quick response can be performed, making it extremely practical.

Examples of the present application will be described below.

First, I will itemize the specifications of the heat pipe used.

Temperature measurement object Furnace gas in a melting furnace Heat pipe Material Steel Pipe diameter 15mm Pipe length 1000mm Pipe volume 176700mm ³ Effective heat receiving section length 150mm Temperature measuring element separation distance from heat dissipation section 250mm Heat medium Water Gas temperature Around 1000℃ Heat dissipation section Figure 3 shows the relationship between the furnace gas temperature (this was measured with a separate thermocouple) and the temperature of the temperature sensing element part a when the temperature measuring device of the present application is used under conditions of a temperature of 150°C or higher. Indicated.

As can be seen from the figure, there is a linear relationship between the temperature Tm of the thermometer element and the furnace gas temperature Tg, and the temperature of the thermometer element changes by 32 degrees for a range of 200 degrees of change in the furnace gas temperature. Compatible.

In summary, the temperature measuring device according to the present invention is provided by placing the heat pipe 15 at a location away from one end located in the temperature measuring section C, and
In the temperature measuring device equipped with a temperature measuring element a for detecting the skin temperature of the heat pipe 1, a driving device 20 for moving one end side of the heat pipe 15 into and out of the temperature measuring section C is provided.
Device 1 for forcibly cooling the other end of 5 to a constant temperature
9 is provided, and the temperature measuring element a is located in the middle of the heat pipe 15 in the longitudinal direction.

That is, according to the above configuration, the temperature of the temperature measuring section C can be indirectly measured based on the skin temperature of the heat pipe 15, which is much lower than that of the temperature measuring section C, as described in detail in the embodiment. Therefore, even if the temperature detection mechanism 21 has low heat resistance, its thermal life can be greatly extended and it is economical.

Moreover, as the heat pipe 15, the temperature measuring part C
Since the heat received by the heat pipe 15 is constantly transferred to the heat dissipation part B, the skin temperature in the heating part A of the heat pipe 15 is considerably lower than the ambient temperature around it. Even if it is a heat pipe, it has a long thermal life and can withstand long-term use, and overall, the heat pipe 1
By changing the temperature measuring system using the temperature measuring device No. 5, it has become possible to provide a temperature measuring device that is less susceptible to heat effects and can withstand long-term use at a low cost.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show examples and experimental results of the temperature measuring device according to the present invention, and FIG. 1 is a sectional view of a melting furnace, FIG. 2 is a cutaway side view of the temperature measuring device, and FIG. 3 is a diagram showing the temperature measuring device of the present invention. FIG. 7 is a diagram showing the relationship between the furnace gas temperature Tg and the temperature Tm of the temperature measuring element when used. 15... Heat pipe, 19... Forced cooling device, 20... Drive device, a... Temperature measuring element, C...
Temperature measuring section.

Claims (1)

[Claims for Utility Model Registration] A temperature measurement device in which a heat pipe 15 is provided with a temperature measurement element a located at a location away from one end located in the temperature measurement section C to detect the skin temperature of the heat pipe 15. and one end side of the heat pipe 15 is connected to the temperature measurement section C.
A driving device 20 is provided for moving the heat pipe 15 in and out, a device 19 is provided for forcibly cooling the other end portion of the heat pipe 15 to a constant temperature, and the temperature measuring element a is located in the middle of the heat pipe 15 in the longitudinal direction. A temperature measuring device.