JPH0820191B2 - Temperature measurement method in continuous furnace - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for accurately measuring the temperature of an object to be fired moving inside a continuous furnace such as a tunnel furnace or a roller hearth furnace.

[0002]

2. Description of the Related Art In order to measure the temperature of a high-temperature object to be burned in a tunnel furnace or the like, a peep window is provided on the side wall of the furnace body, and the surface of the object to be burnt is measured by a high-temperature radiation thermometer through the peek window. Methods of measuring temperature are known.

However, for example, in a bogie type tunnel furnace, although the bogies move in close contact with each other, a space having a predetermined width is formed between the bogies for the objects to be fired loaded on the bogies. It is inevitable. For this reason, if the field of view of the radiation thermometer set aiming at the object to be fired and this gap match, the radiation thermometer will measure the radiant energy from the space between the objects to be fired, It was unavoidable that the output of the radiation thermometer changed as compared with the case of measuring the radiant energy from the surface. Therefore, when controlling the furnace temperature using the measured temperature, there is a drawback that the stability is disturbed.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and enables accurate measurement of the temperature of the object to be fired in the furnace even when there is a gap between the objects to be fired. It has been completed in order to provide a temperature measuring method in a continuous furnace that can be used.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a plurality of units are provided on the side wall of a continuous furnace in which a material to be fired is transferred inside a furnace body with a predetermined gap. At least one radiation thermometer should always be opposed to the object to be fired by installing the radiation thermometer at a distance larger than the gap of the object to be fired, and the temperature of the object to be fired should be measured with these radiation thermometers. It is a feature.

[0006]

The present invention will be described in more detail below with reference to the illustrated embodiment of the tunnel furnace. 1 and 2,
1 is a furnace body of a tunnel furnace, 2 is a dolly that moves inside,
Reference numeral 3 is an object to be fired loaded on each trolley 2. As shown in FIG. 1, the carriages 2 are in close contact with each other, but a predetermined gap B is formed between the objects to be fired 3, 3.

On the side wall of the furnace body 1 as described above, two sight pipes 4, 4 and two radiation thermometers 5, 5 are installed. The distance A between the peep pipes 4 and 4 and the radiation thermometers 5 and 5 is set to be larger than the gap B between the objects to be fired 3 and 3 described above. At the same time, at least one radiation thermometer 5 is always opposed to the object to be fired 3 so as not to enter the gap B. In this embodiment, the higher output of the two radiation thermometers 5 and 5 is used as the object to be fired 3.
Select as the temperature of.

As described above, in the embodiment, since the two radiation thermometers 5 and 5 are installed on the side wall of the furnace body 1, both of the two radiation thermometers 5 and 5 with respect to the object 3 to be fired. When the radiation thermometers 5 and 5 are present, each of them receives radiant energy from the surface of the object to be fired 3 and outputs the temperature. In this case, since both outputs are almost equal, one of the outputs is selected or both outputs are averaged to obtain the temperature of the object to be fired 3.

As shown in FIG. 1, when the gap B between the objects to be fired 3 and 3 comes to the front of the radiation thermometers 5 and 5, the output of the radiation thermometer 5 on the side matching the gap B as described above. Changes. However, since these radiation thermometers 5 and 5 are installed with a gap A larger than the gap B between the objects to be fired 3, 3, both radiation thermometers 5 are simultaneously placed in the gap B between the objects to be fired 3, 3. One does not enter, and one always faces the article to be fired 3. Therefore, if the output on the high temperature side, for example, is selected from the outputs of these radiation thermometers 5 and 5, the temperature of the object to be fired 3 is always output correctly, and this output is used to control the furnace temperature There is no fear that stability will be impaired even when performing.

The radiation thermometer used in the present invention includes all thermometers capable of measuring temperature by utilizing radiation from the surface of an object. Although two radiation thermometers are used in the embodiment, three or more radiation thermometers can be used. Further, in the embodiment, the high temperature side is selected when the outputs of the two radiation thermometers are different, but it is also possible to select the low temperature side. Which one is selected can be empirically determined according to the installation location.

[0011]

As described above, the present invention can always stably and accurately measure the temperature of the object to be fired even when there is a gap between the objects to be fired transferred in the furnace. Therefore, as a temperature measuring method in a continuous furnace that solves the conventional problems, it greatly contributes to industrial development.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 furnace body 2 trolley 3 object to be fired 4 peep pipe 5 radiation thermometer A distance between radiation thermometers B gap between objects to be fired

Claims (1)

[Claims] 1. A plurality of radiation thermometers are installed on the side wall of a continuous furnace in which the material to be fired is transferred inside the furnace body while keeping a predetermined gap, and the radiation thermometers are arranged at intervals larger than the distance to the material to be fired. A temperature measuring method in a continuous furnace, characterized in that at least one radiation thermometer is always opposed to the object to be fired, and the temperature of the object to be fired is measured by these radiation thermometers.