JPH09126907A - Continuous temperature measuring apparatus in furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the true temperature in the vicinity of the central part of a furnace continuously and to make it possible to supply correct temperature data by inserting a temperature measuring means into a heat resisting guide tube so that the means can be moved freely back and forth. SOLUTION: In a furnace 10, inserting holes 13a and 13b are opened in a pair of opposed furnace walls 12a and 12b marking a space 11 in the furnace. A heat resisting guide tube 14, which is inserted through the holes 13a and 13b, is extended and passed across the vicinity of the central part of the space 11 in the furnace. A temperature measuring means 29 is inserted into the guide tube 14 so that the means is freely movable back and forth. That is to say, the temperature measuring means 29 is inserted into the guide tube 14 through a sending end 14a from the outside of the furnace. Thus, the continuous measurement not only at the places in the vicinities of the furnace walls 12a and 12b but also at the intended places including the vicinity of the central part in the furnace along the guide tube 14 can be performed, and the true temperature in the furnace can be detected. Then, the correct temperature data for keeping the temperature in the furnace adequate can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for continuously measuring the temperature inside a furnace such as a refuse incinerator.

[0002]

2. Description of the Related Art Conventionally, it is known that municipal waste, industrial waste, etc. are incinerated in an incinerator.

By the way, in recent years, environmental problems have been highlighted, and management of toxic gases such as dioxins generated in refuse incinerators is emphasized. The generation of dioxins is closely related to the incineration temperature, and in order to suppress the generation, it is necessary to maintain the temperature inside the furnace at a predetermined temperature.

With respect to this point, for example, in an incinerator for municipal waste as shown in FIG. 1, there is a method of detecting the temperature inside the furnace at a plurality of locations and controlling the temperature inside the furnace according to the detected temperature. Proposed.

The municipal waste incinerator illustrated in FIG. 1 has a first combustion chamber 2 having a grate 1, a second combustion chamber 3 provided above the first combustion chamber 2, and the second combustion chamber 2. A gas discharge passage 5 for guiding the combustion gas generated in the chamber 3 to the flue 4 is provided.
In the lower part of the combustion chamber 3, a plurality of secondary air supply nozzles 6,
A plurality of water spray nozzles 7 are provided.

[0006] Then, the dust 9 introduced from the hopper 8
Is placed on the grate 1 and burned by primary air supplied from below and secondary air supplied from the secondary air supply nozzle 6. The combustion gas generated by incineration of the dust 9 rises from the first combustion chamber 2 to the second combustion chamber 3 and then,
The gas is discharged from the flue 4 via the gas discharge path 5 and sent to the exhaust gas treatment device.

The amount of spray water from the water spray nozzle 7 and the amount of cooling air from the secondary air supply nozzle 6 are controlled according to the detected temperature inside the furnace. That is, when the temperature in the furnace is high, the amount of spray water and / or the amount of cooling air is increased, and when the temperature in the furnace is low, the amount of spray water and / or the amount of cooling air is decreased, thereby increasing the temperature in the furnace. Suppress the generation of toxic gases such as dioxins while maintaining the proper temperature.

[0008]

Thus, although the temperature control in the refuse incinerator is an extremely important factor, the conventional temperature measuring device cannot accurately measure the true temperature in the furnace. Is the current situation.

According to the prior art, since the temperature detecting means is inserted into the furnace wall and only slightly protrudes from the inner wall surface of the furnace wall, the temperature in the vicinity of the furnace wall is measured. , The temperature of the central part is not measured.

According to experiments conducted by the present inventors in this regard, the temperature inside the refuse incinerator has a considerable temperature gradient between the portion near the furnace wall and the central portion of the furnace. found. For this reason, in the conventional technique of measuring the temperature near the furnace wall, the temperature of the furnace central portion close to the true temperature is not accurately measured, and as a result, the generation of dioxin cannot be sufficiently suppressed. It was discovered.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in order to effectively operate a control system for suppressing the generation of toxic gases such as dioxins, it is necessary to provide a true system near the center of the furnace. It is intended to provide an apparatus capable of measuring temperature and supplying correct temperature data. Further, in continuous temperature measurement, the present invention provides a device that can safely replace the consumable part of the device while continuing the operation of the furnace, and can automate the replacement work. Further, the present invention provides an apparatus that enables not only continuous temperature measurement of the furnace temperature but also gas analysis in the furnace.

Therefore, the first aspect of the present invention is that a heat-resistant guide tube extending across the inner space of the furnace; a temperature measuring means inserted into the guide tube from outside the furnace so as to be able to move back and forth. It consists of;

The second aspect of the present invention is that the heat-resistant guide tube extends across the interior of the furnace and has a gas introduction hole facing the interior of the furnace; The temperature measuring means is inserted into the guide tube so as to be able to move back and forth; and the gas collecting means for taking out and collecting the gas infiltrated into the guide tube through the gas introduction hole from the guide tube outside the furnace.

Further, according to the third aspect of the present invention, the roll is unwound from one roll outside the furnace and is fed to the other side outside the furnace across the space inside the furnace. A heat-resistant guide tube; a temperature measuring means including a thermocouple which is inserted into the guide tube from the insertion end of the guide tube so as to be able to advance and retreat; a feeding drive means for feeding the guide tube; and a temperature measuring means. Transfer driving means for moving the guide tube forward and backward; withdrawing from the insertion end of the guide tube by retracting the temperature measuring means by the transfer driving means, and a new tube portion of the guide tube from the roll by the feeding drive means A cutter that cuts and separates the used tube portion from a new tube portion while the used tube portion consumed in the furnace space is inserted into the outside of the furnace. In which consisted; it means the.

In the embodiment of the present invention, the guide tube extending across the inner space of the furnace is inserted into the furnace wall on one side through the introduction guide tube, and is guided out to the furnace wall on the other side. It is preferable that there is provided a sealing means that is inserted through and that hermetically seals between the cylindrical portions of the introduction guide tube and the extraction guide tube and the outer peripheral surface of the guide tube.

In addition, the insertion end of the guide tube is located near the insertion end of the guide tube inserted from one side outside the furnace and across the space inside the furnace and inserted into the other side outside the furnace. It is preferable to provide a cooling unit that can cool the vicinity of the unit.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(First Embodiment) The first embodiment shown in FIGS. 2 and 3.
In the embodiment, the furnace 10 indicates a furnace whose temperature is to be measured, such as a refuse incinerator. For example, in the case of the municipal refuse incinerator shown in FIG. 1, it is usually the first combustion chamber 2 and / or the second combustion chamber. Although the combustion chamber 3 is targeted, the gas discharge path 5 or the flue 4 may be targeted as necessary. Further, the present invention can be applied not only to the refuse incinerator as shown in the figure but also to various furnaces.

The furnace 10 has insertion holes 13a and 13b formed in a pair of facing furnace walls 12a and 12b which define a furnace internal space 11, and is inserted in a erected manner through the pair of insertion holes 13a and 13b. The heat-resistant guide tube 14 is made to extend across the center of the furnace space 11 while passing therethrough.

The guide tube 14 is a continuous elongated body made of, for example, a flexible metal tube made of stainless steel or another metal, and is fed from a roll 16 wound around a drum 15 at one side outside the furnace. Is the first
After passing through the introduction guide tube 18 via the feeding drive means 17,
It is inserted into the furnace internal space 11 through the insertion hole 13a.

The first feeding drive means 17 is provided with a pair of drive rollers 17a and 17b which are rotationally driven by a drive source such as a motor, and transfers the guide tube 14 inserted between the two rollers. It constitutes a feeding mechanism.

The introduction guide tube 18 is fixed to one furnace wall 12a via a joint member 19 and hermetically seals between the tube portion of the introduction guide tube 18 and the outer peripheral surface of the guide tube 14. The sealing means 18a is provided. The sealing means 18a has a laminated structure in which, for example, an annular seal disk made of silicon or the like and an annular spacer disk made of fluororesin (trademark: Teflon) are alternately laminated, and slides on the guide tube 14. Hold freely and airtightly. Therefore, the gas in the furnace space 11 is inserted into the insertion hole 13a.
Although it penetrates into the joint member 19 via, it is sealed by the sealing means 18a there and does not leak out of the furnace.

A distance meter 20 is provided in the vicinity of the first feeding drive means 17 to detect the feeding length of the guide tube 14.

Guide tube 1 crossing the furnace space 11
4 is inserted from the insertion hole 13b of the other furnace wall 12b,
Cooling means 21, lead-out guide tube 22, first feeding drive means 23
After passing through, the posture control means 24 holds the insertion end 14a of the guide tube 14.

The cooling means 21 is fixed to the other furnace wall 12b through a joint member 25, constitutes a housing that surrounds the guide tube 14, and has an inlet port 21a for introducing a refrigerant into the housing. An outlet port 21b for discharging the refrigerant is provided. Although not shown, a coolant supply source for supplying a coolant composed of cooling air or other cooling fluid is connected to the inlet port 21a. Also, the outlet port 2
A refrigerant processing device is appropriately connected to 1b.

The lead-out guide tube 22 is connected to the cooling means 21, and is provided with a sealing means 22a for hermetically sealing between the tube portion of the lead-out guide tube 22 and the outer peripheral surface of the guide tube 14. There is. The sealing means 22a has a laminated structure in which, for example, an annular seal disk made of silicon or the like and an annular spacer disk made of fluororesin (trademark: Teflon) are alternately laminated, and slides on the guide tube 14. Hold freely and airtightly. Therefore, the gas in the furnace space 11 enters the housing of the cooling means 21 through the insertion hole 13b, but is sealed by the sealing means 22a there and does not leak to the outside of the furnace.

The second feeding drive means 23 is provided with a pair of drive rollers 23a and 23b which are rotationally driven by a drive source such as a motor, and transfers the guide tube 14 inserted between the two rollers. It constitutes a feeding mechanism.

The posture control means 24 is provided with, for example, rotatable parallel arms 24a and 24b arranged with the guide tube 14 interposed therebetween, and the direction in which the insertion end 14a of the guide tube 14 is directed is shown in FIG. A controllable mechanism is provided between the extension direction of the guide tube 14 as shown in FIG. 3 and the direction deviated at a predetermined angle with respect to the extension direction as shown in FIG.

Further, cutter means 26 is provided at a position where the insertion end 14a of the guide tube 14 faces when the attitude of the guide tube 14 is deviated via the attitude control means 24. The means 26 is configured to be movable back and forth by a driving means 27 such as a cylinder.
Further, a discharging means 28 is provided in the vicinity of the cutter means 26, and the discharging means 28 is driven by a pair of drive rollers 28a, 28b which are rotationally driven by a driving source such as a motor.
It has.

The guide tube 14 has a temperature measuring means 2
9 is inserted so that it can move back and forth. That is, the temperature measuring means 29
Is the guide tube 14 from outside the furnace via the insertion end 14a.
Is inserted into.

The temperature measuring means 29 is provided with a thermocouple 30 such as a sheath thermocouple forming a tip portion and a compensating lead wire 31 extended from the thermocouple 30, and is moved forward and backward by a transfer driving means 32. . The compensating lead 31 is a temperature detecting means 33 for detecting the temperature based on the electromotive force of the thermocouple.
It is connected to the. Further, a distance meter 34 is provided near the transfer driving means 32, and the transfer length dimension of the temperature measuring means 29 by the transfer driving means 32 is detected.

The operation will be described based on the continuous temperature measuring device of the first embodiment having the above-mentioned structure. As shown in FIG. 2, the guide tube 14 was extended across the furnace space 11. In this state, the temperature measuring means 2 is moved by the transfer driving means 32.
If 9 is inserted into the guide tube 14 and the thermocouple 30 of the temperature measuring means 29 is made to enter the central position C1 in the furnace, the temperature inside the furnace can be continuously measured there. The transfer length of the temperature measuring unit 29 advanced by the transfer driving unit 32 is detected by the range finder 34, and therefore the thermocouple 30 is used.
Can be accurately stopped at the center position C1.
Similarly, based on the distance meter 34, the thermocouple 30 can be placed at the front and rear positions C2 and C3 of the central position C1.

When the temperature measuring means 29 is inserted into the guide tube 14, the roller of the transfer driving means 32 is driven to insert the portion near the tip of the thermocouple 30 into the open end of the guide tube 14 and thereafter. Can employ a method in which air is blown from the open end of the guide tube 14 to pneumatically feed the thermocouple 30 to a predetermined position of the guide tube 14, and the transfer driving means 32 is combined with such a driving roller and pneumatic feeding means. Can be configured. At this time, thermocouple 3
An air receiving member is fixed in the vicinity of 0, and the air feeding is performed in a state where the temperature measuring means 29 is not held by the roller of the transfer driving means 32, and the thermocouple 30 is air fed to a predetermined position. At this time, the temperature measuring driving means 29 is held by the roller and stopped.

Therefore, as in the conventional case, the furnace walls 12a, 12b
In addition to performing temperature measurement in the vicinity of the center of the furnace, the furnace space 11 including the center position C1 along the guide tube 14 is measured.
It is possible to continuously measure the temperature at an arbitrary point of, and obtain temperature data for maintaining the inside of the furnace at an appropriate temperature, such as suppressing generation of toxic gas such as dioxin.

In this state, the insertion holes 13a and 13b into which the guide tubes 14 are inserted are respectively inserted into the introduction guide tube 1.
Since it is sealed by the sealing means 18a of No. 8 and the sealing means 22a of the lead-out guide cylinder 22, the toxic gas in the furnace interior space 11 does not leak out of the furnace.

By the way, when the thermocouple 30 is consumed and deteriorated as a result of continuous temperature measurement, the temperature measuring means 29 is retracted by the transfer driving means 32, the thermocouple 30 is pulled out from the guide tube 14 and replaced with a new thermocouple 30. Just do it. After the replacement, the temperature measuring means 2 is moved by the transfer driving means 32 in the same manner as described above.
9 may be advanced and the thermocouple 30 may be stopped and fixed at a predetermined position in the guide tube 14 via the distance meter 34. During the replacement work, the furnace interior space 11 is sealed as described above, and the toxic gas does not leak outside the furnace.

On the other hand, when the guide tube 14 extending into the furnace space 11 is consumed and deteriorated, the guide tube 14 can be renewed by feeding out a new portion of the guide tube 14 from the roll 16.

In order to update the guide tube 14, as shown in FIG. 3, first, the temperature measuring means 29 is moved backward by the transfer driving means 32 and pulled out from the guide tube 14. Then, the attitude control means 24 is used to guide the guide tube 1.
The insertion end 14a of No. 4 is displaced, and in this state, the first delivery drive means 17 and the second delivery drive means 23 are driven to deliver the new tube portion 14-N from the roll 16, and
The exhausted used tube portion 14-O is sent to the discharging means 28 and discharged by the discharging means 28. During this time,
Since the cooling means 21 is operated and the used tube portion 14-O heated in the furnace space 11 is cooled and transferred toward the discharging means 28, the sealing means 2 in the outlet guide cylinder 22.
There is no thermal influence on the peripheral mechanisms such as 2a and the second feeding drive means 23a, and moreover, an operator who handles the used tube portion 14-O discharged from the discharging means 28 is exposed to heat. There is no such thing. Further, during such a discharging operation, the in-furnace space 11 is sealed as described above, and the toxic gas does not leak to the outside of the furnace.

When the used tube portion 14-O that has been consumed and deteriorated in the furnace space 11 is discharged to the outside of the furnace and the distance meter 20 detects that the furnace space 11 has been updated by a new tube portion 14-N, By stopping the first feeding drive means 17 and the second feeding drive means 23 and operating the cutter means 26, the used tube portion 14-O is cut and separated from the new tube portion 14-N. Then, the attitude control means 24 is returned to the new tube portion 1
The insertion end 14a constituted by the cut end of 4-N faces the thermocouple 30. At this time, when there is a possibility that the new tube portion 14-N extending across the furnace space 11 is loosened, the first feeding drive means 17 is stopped and the feeding end of the new tube portion 14-N is stopped. With the vicinity held, by operating the second feeding drive means 23, the vicinity of the insertion end 14a of the tube portion 14-N is pulled, and if a tension is given to the new tube portion 14-N as a whole, It can be held in a straight state without slack. At this stage, the cooling means 21 has finished its operation.

When the renewal work of the guide tube 14 is completed in this way, the temperature measuring means 29 is again advanced by the transfer driving means 32, and the thermocouple 30 is inserted into a predetermined position of the guide tube 14 and set in place. As shown in, continuous temperature measurement may be restarted.

The replacement work of the thermocouple 30 and the updating work of the guide tube 14 as described above can be performed fully automatically by a programmed control system.
Meanwhile, furnaces such as incinerators can continue to operate.

(Second Embodiment) A second embodiment shown in FIGS. 4 and 5.
The embodiment basically includes all the configurations of the above-described first embodiment. Therefore, the technical configuration and operation of the parts indicated by the same reference numerals as those given in FIG. 2 and FIG.
All are the same as in the first embodiment, and all the above explanations are incorporated.

Therefore, the structure added in the second embodiment will be described.
A gas introduction hole 41 is provided to face 1. Although a single hole is shown in the illustrated example, it may be formed of a plurality of small holes. The gas introduction holes 41 may be holes formed in advance in the elongated body of the guide tube 14 wound around the roll 16 at predetermined equal intervals, but a punch means may be provided near the first feeding drive means 17. Alternatively, the new tube portion 14-N may be formed by punching the new tube portion 14-N, which is unperforated from the roll 16 when the guide tube 14 is renewed.

Therefore, various gases in the furnace space 11 enter the guide tube 14 through the gas introduction hole 41 and are taken out from the insertion end 14a of the guide tube 14.

At the insertion end 14a of the guide tube 14,
Gas sampling means 42 is provided, and the gas sampling means 4 is provided.
2 includes a first sealing means 43 for hermetically holding the insertion end 14a of the guide tube 14 from the outer circumference, and a second sealing means 44 for hermetically holding the temperature measuring means 29 from the outer circumference. An exhaust port 45 for exhausting the collected gas is provided between 43 and 44.

The first sealing means 43 and the second sealing means 44 are laminated by alternately laminating an annular sealing disk made of, for example, silicon and an annular spacer disk made of fluororesin (Teflon). Have a structure,
The insertion end 14a of the guide tube 14 and the temperature measuring means 29 are slidably and airtightly held, respectively. Therefore, the gas that has entered the gas sampling means 42 is protected by the sealing means 43, 4 and 4.
It is sealed by 4 and does not leak outside.

The exhaust port 45 is connected to the gas analysis means 46, and analyzes the gas sampled there. A suction means 47 such as a suction pump is provided between the exhaust port 45 and the gas analysis means 46 to positively suck the gas from the gas introduction hole 41 and feed the sucked gas to the gas analysis means 16. It is preferable to configure as follows.

In order to enable updating of the guide tube 14 as described in the first embodiment, the gas sampling means 42 is provided with a forward / backward drive means 48 such as a cylinder. That is, as shown in FIG. 5, when updating the guide tube 14, by driving the advancing / retreating drive means 48,
The gas sampling means 42 is the insertion end 14 of the guide tube 14.
It is retracted from a. Therefore, by this, the insertion end 1
4a is released from the gas sampling means 42, and the attitude control means 24 can control the attitude. When the guide tube 14 is updated and the attitude control means 24 returns to the original position, the advancing / retreating drive means 48 is driven so that the gas sampling means 42 is inserted into the new guide tube 14 as shown in FIG. The insertion end 14a is airtightly held by advancing toward the end 14a.

As with the replacement work of the thermocouple 30 and the updating work of the guide tube 14, the driving of the advancing / retreating drive means 48 at the time of updating the guide tube 14 is fully automated by the programmed control system. During that time, the furnace such as the incinerator can continue to operate.

[0050]

According to the present invention, a heat-resistant guide tube 14 extending across the space 11 inside the furnace; and a temperature measuring means 2 inserted into the guide tube 14 from outside the furnace so as to be able to move back and forth.
Since it is composed of 9 and;
Since it is possible to continuously measure the temperature not only in the vicinity of a and 12b but also in the desired location including the vicinity of the center of the furnace along the guide tube 14, it is possible to detect the true temperature in the furnace. This has the effect of providing correct temperature data for maintaining the internal temperature at an appropriate value.

Further, according to the present invention, a heat-resistant guide tube 14 extending across the furnace space 11 and having a gas introduction hole 41 facing the furnace space 11; Temperature measuring means 29 which is inserted into 14 so as to be able to move back and forth;
The gas injecting means 4 for extracting the gas invading the inside of the furnace 4 from the guide tube outside the furnace and the gas collecting means 42; It is possible to obtain the analysis data of the gas necessary for the normal combustion of the furnace, because it has the effect of two birds with one stone that can be easily collected.

Further, according to the present invention, a heat-resistant guide tube that is unwound from the roll 16 wound on one side outside the furnace and traverses the space 11 inside the furnace and is inserted into the other side outside the furnace. 14; temperature measuring means 29 including a thermocouple 30 that is inserted into the guide tube 14 from the insertion end 14a of the guide tube 14 so as to move forward and backward; and feeding drive means 17 and / or 23 for feeding the guide tube 14. Transfer driving means 32 for moving the temperature measuring means 29 to and from the guide tube 14 so that the temperature measuring means 29 can be moved back and forth.
4a, and feeds a new tube portion 14-N of the guide tube 14 from the roll 16 by the feeding drive means 17 and / or 23, and the furnace space 1
The cutter means 26 for cutting and separating the used tube portion 14-O from the new tube portion 14-N in a state where the used tube portion 14-O consumed in 1 is inserted out of the furnace.
Therefore, when the guide tube 14 is consumed and deteriorated in the furnace space 11, the guide tube 14 can be renewed by simply feeding it out of the roll 16, and the renewal work can be performed. Is extremely easy. Moreover, after the guide tube 14 is renewed, the used tube portion 14-O is cut and separated by the cutter means 26 so that the new tube portion 14-N is formed with the insertion end 14a, and the transfer driving means 32 is used. Since the temperature measuring means 29 is inserted into the insertion end 14a and the thermocouple 30 is newly placed at a desired position of the guide tube 14, continuous temperature measurement can be resumed, so that these operations can be performed very safely and at the same time. This has the effect of enabling automation of.

Moreover, according to the present invention, the guide tube 14 extending across the furnace space 11 is provided on one side of the furnace wall 1
2a is inserted through the introduction guide cylinder 18 and is inserted into the furnace wall 12b on the other side through the extraction guide cylinder 22, and the introduction guide cylinder 18 and the extraction guide cylinder 22 are formed as guide tubes. Since the sealing means 18a and 22a for hermetically sealing the outer peripheral surface of the furnace 14 are provided, it is safe that the toxic gas in the furnace internal space 11 does not leak to the outside of the furnace.

Further, according to the present invention, in the vicinity of the insertion end 14a of the guide tube 14 which is inserted from one side portion outside the furnace and traverses the furnace internal space 11 and is inserted into the other side portion outside the furnace. Since the guide tube 14 is renewed as described above, since the cooling means 21 is provided for cooling the portion near the insertion end 14a of the guide tube, the furnace space 1
The used tube portion 14-O heated by 1 is cooled by the cooling means 2.
Since it is discharged after being cooled by 1, there is an effect that there is no thermal influence on the component members of the device and the safety of the worker etc. can be secured.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a conventional refuse incinerator.

FIG. 2 is a vertical cross-sectional view showing a state in which the temperature inside the furnace is being measured based on the first embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view showing a state where the guide tube is being renewed based on the first embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing a state in which the temperature inside the furnace is measured and the gas is sampled based on the second embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing a state in which the guide tube is being updated based on the second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 furnace 11 furnace space 12a furnace wall 12b furnace wall 13a insertion hole 13b insertion hole 14 guide tube 16 roll 17 first feeding drive means 18 introduction guide tube 18a sealing means 21 cooling means 22 derivation guide tube 22a sealing means 23 second feeding Drive means 24 Attitude control means 26 Cutter means 28 Ejection means 29 Temperature measurement means 30 Thermocouple 31 Compensation lead wire 32 Transfer drive means 33 Temperature detection means 41 Gas introduction hole 42 Gas sampling means

Claims (5)

[Claims] 1. A continuous measurement in a furnace, comprising: a heat-resistant guide tube extending across a space in the furnace; and a temperature measuring means inserted into the guide tube from outside the furnace so as to be able to move back and forth. Warming device. 2. A heat-resistant guide tube extending across the furnace space and having a gas introduction hole facing the furnace space; a temperature measuring means inserted into the guide tube from outside the furnace so as to be able to move back and forth. A continuous gas temperature measuring device in the furnace, which comprises: a gas sampling means for sampling the gas that has entered the guide tube through the gas introduction hole from the guide tube outside the furnace; 3. A heat-resistant guide tube which is fed from a roll wound on one side outside the furnace and is inserted into the other side outside the furnace across the space inside the furnace; Temperature measuring means including a thermocouple which is inserted into the guide tube from its end so as to be movable back and forth; feeding drive means for feeding the guide tube; transfer driving means for moving the temperature measurement means to the guide tube movably With the transfer driving means retracting the temperature measuring means from the inserting end of the guide tube, and with the feeding driving means feeding out a new tube portion of the guide tube from the roll. Continuous temperature measurement in the furnace, comprising: cutter means for cutting and separating the used tube part from a new tube part in a state where the used tube part is inserted outside the furnace. apparatus. 4. A guide tube extending across the inner space of the furnace is inserted into a furnace wall on one side through an introduction guide tube, and is inserted into a furnace wall on the other side through a discharge guide tube. 4. The furnace according to claim 1, 2 or 3, further comprising sealing means for airtightly sealing between the cylindrical portions of the introduction guide tube and the extraction guide tube and the outer peripheral surface of the guide tube. Continuous temperature measuring device. 5. An insertion end of the guide tube near the insertion end of a guide tube that is inserted from one side outside the furnace and that crosses the space inside the furnace and is inserted into the other side outside the furnace. 5. The continuous temperature measuring device in the furnace according to claim 1, characterized in that it is provided with a cooling means capable of cooling the vicinity of the.