JPH0862052A - High temperature part measuring device - Google Patents

Abstract

(57) [Abstract] [Purpose] To make the work easy and to protect the lead wire against high temperature. [Structure] A sensor 2 attached to a portion to be measured 1 in a high temperature atmosphere, a lead wire 3 inserted through a cooling pipe 4 and led from the sensor 2 to a recorder 6 in a normal temperature atmosphere, and a cooling pipe 4 A cooling medium supply device 7 for supplying a cooling medium and a cooling medium outlet 9 formed in the vicinity of the sensor 2 of the cooling pipe 4 are provided, and the cooling medium is flown into the cooling pipe 4 to cool the lead wire 3 and the lead wire. 3 is protected from deterioration due to heat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high temperature part measuring device for measuring the state of a part to be measured in a high temperature atmosphere.

[0002]

2. Description of the Related Art When measuring the temperature, strain, etc. of a metal in a high temperature atmosphere such as a furnace wall tube of a boiler, a vertical suspension tube, a horizontal tube of a rear heat transfer section, etc., a heat transfer tube in a high temperature atmosphere It is necessary to fix a sensor such as a thermocouple type thermometer and a strain gauge to the part to be measured, and lead the measurement signal measured by this sensor to a recorder placed in an ambient temperature atmosphere outside by a lead wire.

Sensors such as thermocouple type thermometers and strain gauges are
Although a material that can withstand high temperatures has been developed, the leads connected to the sensor do not have heat resistance, so the leads must be protected against high temperatures.

An example of such a conventional high temperature part measuring apparatus will be described with reference to FIGS. 4 and 5 which is a partially enlarged sectional view taken along line VV of FIG. 4 shows a heat transfer tube a which is horizontally arranged in the rear heat transfer section, and as shown in FIG. 4, the temperature and strain of the heat transfer tube a exposed to the high temperature atmosphere of the combustion gas G are measured to be measured. From the portion b to the outer end portion d of the ambient temperature atmosphere outside the boiler can wall c, a longitudinal groove e is engraved on the outer surface of the heat transfer tube a, and a thermoelectric field is formed in the groove e of the measured portion b. A sensor f such as a pair type thermometer and a strain gauge is fixed, and the lead wire g attached to the sensor f is housed in the groove e and pulled out to the outer end portion d of the heat transfer tube a, and an external normal temperature atmosphere It leads to the recorder h placed at. The outer side of the groove e accommodating the lead wire g is covered with the lid i by welding, as shown in FIG.

Since water and steam flow inside the heat transfer tube a,
Since the temperature inside the heat transfer tube a is lower than that in the high temperature atmosphere outside the heat transfer tube a, the inside of the groove e is shielded by the lid i and kept at a relatively low temperature, and the leads housed inside the groove e. The line g will be protected against high temperatures without being exposed.

[0006]

The conventional high temperature part measuring apparatus shown in FIGS. 4 and 5 has a problem that the work of engraving the groove e on the object to be measured is troublesome and time-consuming, and the apparatus becomes expensive. In addition, there is a defect that the lead wire g may not be sufficiently protected against high temperature.

The present invention overcomes these conventional drawbacks,
It is an object of the present invention to provide a high temperature part measuring device which is easy to work and can sufficiently protect the lead wire against high temperature.

[0008]

The first means of the present invention is to:
A sensor attached to the part to be measured in a high temperature atmosphere, a lead wire that is inserted into the cooling pipe and led from the sensor to a recorder in a normal temperature atmosphere, and a cooling medium supply that supplies a cooling medium into the cooling pipe. An apparatus and a cooling medium outlet formed in the vicinity of the sensor of the cooling pipe are provided, and the second means of the present invention is to branch from the vicinity of the sensor of the cooling pipe in the high temperature measuring device to supply the cooling medium. A cooling medium recovery pipe connected to the apparatus is provided.

[0009]

According to the first and second means, the work of attaching the cooling pipe is simple, and the lead wire inserted in the cooling pipe is cooled by the cooling medium supplied into the cooling pipe and becomes high temperature. Well protected against.

Further, according to the second means, the cooling medium can be recovered and reused without being discharged to the outside, so that the cost can be saved and the influence on the high temperature atmosphere can be prevented.

[0011]

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

FIG. 1 is a cross-sectional view of an embodiment of the invention of claim 1, which is in a high temperature atmosphere due to combustion gas G of a heat transfer tube of a boiler, for example, a heat transfer tube horizontally arranged in a rear heat transfer section. A capsule-type sensor 2 sealed in Inconel, which is a heat-resistant metal, is attached to the outer surface of the measured portion 1.

When the measured portion 1 is the heat transfer tube of the boiler, the high temperature ambient temperature outside the measured portion 1 is 900 to 1.0.
The temperature of the measured portion 1 which is a heat transfer tube is about 600 ° C., and the heat-resistant metal Inconel and the capsule-type sensor 2 enclosed in Inconel have sufficient durability at such a temperature. are doing.

The lead wire 3 having one end attached to the sensor 2 is a steel wire having one end attached to the sensor 2,
It is inserted into a cooling pipe 4 made of metal such as stainless steel, and in the state of being inserted into the cooling pipe 4, it is drawn out to a normal temperature atmosphere outside the boiler can wall 5 and the like. The other end of the lead wire 3 is led to the recorder 6 placed in a normal temperature atmosphere.

A cooling medium supply device 7 is installed in a normal temperature atmosphere, and the cooling medium cooled by the cooling medium supply device 7 passes through the cooling medium supply pipe 8 and is located outside the boiler can wall 5 or the like. 4 is supplied into the cooling pipe 4 from the outer end.

As shown in FIG. 2, a cooling medium outlet 9 is bored in a portion of the cooling pipe 4 near the sensor 2.

Next, the operation of the apparatus shown in FIG. 1 will be described.

The state of temperature, strain, etc. of the portion to be measured 1 in a high temperature atmosphere is measured by the sensor 2, and the measurement signal is guided to the recorder 6 by the lead wire 3 inserted in the cooling pipe 4. .

From the cooling medium supply device 7, the cooled cooling medium is supplied through the cooling medium supply pipe 8 into the cooling pipe 4 from the outer end of the cooling pipe 4 outside the boiler can wall 5 or the like. The cooling medium flows in the cooling pipe 4 toward the measured portion 1, and the lead wire 3 inserted in the cooling pipe 4
Is cooled to protect the lead wire 3 from deterioration due to heat.

The cooling medium flowing through the cooling pipe 4 toward the measured portion 1 while cooling the lead wire 3 reaches the cooling medium outlet 9 and is discharged from the cooling medium outlet 9 to the outside of the cooling pipe 4. It The cooling medium is selected so that it does not adversely affect the high temperature atmosphere even if it is discharged into the high temperature atmosphere. In the case of a boiler, air or steam is suitable.

FIG. 3 is a sectional view of an embodiment of the invention of claim 2 and the same parts as those in FIG. 1 are designated by the same reference numerals.

In the apparatus shown in FIG. 3, the cooling medium outlet 9 is formed in the cooling pipe 4 near the sensor 2.
At one end of the cooling medium recovery pipe 10 is attached by welding or the like.

The cooling medium recovery pipe 10 is branched from the cooling pipe 4 and is guided to the outside of the boiler can wall 5 or the like substantially along the cooling pipe 4, and the other end of the cooling medium recovery pipe 10 is cooled by the cooling medium supply device 7. It is connected to the medium inlet.

Also in the apparatus shown in FIG. 3, the sensor 2 measures the state of temperature, strain, etc. of the portion to be measured 1 in a high temperature atmosphere, and the measurement signal is the lead wire inserted in the cooling pipe 4. The lead wire 3 is guided to the recorder 6 by 3 and is cooled by the cooling medium flowing in the cooling pipe 4 toward the measured portion 1, and is protected from deterioration due to heat.

While cooling the lead wire 3, the cooling medium flowing through the cooling pipe 4 toward the measured portion 1 and reaching the cooling medium outlet 9 is not discharged to the outside from the cooling medium outlet 9. After flowing into the cooling medium recovery pipe 10 and being recovered by the cooling medium supply device 7, it is cooled again and circulated through the cooling medium supply pipe 8.

In the above embodiment, the case of application to the boiler heat transfer tube is illustrated, but it is needless to say that the invention can be applied to the case of measuring temperature, strain, etc. in a high temperature atmosphere other than the boiler.

[0027]

According to the first and second aspects of the present invention, the lead wire is inserted into the cooling pipe and is cooled by the cooling medium flowing in the cooling pipe so that deterioration due to heat does not occur. Well protected.

Further, there is an effect that it can be manufactured at low cost and easily by a simple work of providing a cooling pipe and a cooling medium supply device.

Furthermore, the invention of claim 2 is economical even when an expensive cooling medium is used, since the cooling medium is recycled without being discharged to the outside simply by adding the cooling medium recovery pipe. Further, even when the discharge of the cooling medium affects the device and the environment, the adverse effect can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the invention of claim 1;

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a sectional view of an embodiment of the invention of claim 2;

FIG. 4 is a plan view showing an example of a conventional device.

5 is a partially enlarged cross-sectional view taken along line VV of FIG.

[Explanation of symbols]

 1 part to be measured 2 sensor 3 lead wire 4 cooling pipe 6 recorder 7 cooling medium supply device 10 cooling medium recovery pipe

Claims (2)

[Claims] 1. A sensor attached to a portion to be measured in a high temperature atmosphere, a lead wire which is inserted into a cooling pipe and led from the sensor to a recorder in a normal temperature atmosphere, and a cooling medium in the cooling pipe. A high temperature section measuring device comprising: a cooling medium supply device for supplying the cooling medium; and a cooling medium outlet formed near the sensor of the cooling pipe. 2. The high temperature section measuring device according to claim 1, further comprising a cooling medium recovery pipe branched from the vicinity of the sensor of the cooling pipe and connected to the cooling medium supply device.