JPS6059511B2 - Surface temperature measuring device for objects inside the furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for radiation-measuring the surface temperature of an object in a high-temperature furnace.

The present inventor previously proposed a temperature measurement method that uses a heat-resistant shield tube in the optical path between the radiometer and the object to be measured in the furnace, that is, the shield tube is heated above the furnace temperature, and the temperature of the shield tube is In Japanese Patent Application No. 54-63469, a temperature measurement method was proposed in which the temperature of the object to be measured was determined by actually measuring and correcting the temperature.

When implementing such a method, if the temperature of the shield tube itself reaches 1000° C. or higher, it is difficult to actually measure the temperature of the shield tube with a thermocouple, especially in terms of continuity. The present invention provides a device that can stably measure temperature by using two radiometers, and the first invention is to arrange the radiometers to face the object to be measured in the furnace. A heat-resistant shield tube is installed in the optical path between the radiometer and the object to be measured, and the radiant energy from the object to be measured and the radiant energy from the heat-resistant shield tube are detected, and these two detected values are calculated. In the device for determining the temperature of a temperature-measuring object by At the end facing the radiometer, two radiometers are installed so that one detects the radiant energy from the temperature-measuring object through the aperture, and the other detects the radiant energy from the shielding plate surface. A second invention is a device for measuring the surface temperature of an object in a furnace, characterized in that a radiometer is disposed facing the object to be measured in the furnace, and the radiometer and the temperature to be measured are connected to each other. A heat-resistant shield tube is installed in the optical path between the object and the
In a device that detects the radiant energy from the temperature-measuring object and the radiant energy from the heat-resistant shielding tube and calculates the temperature of the temperature-measuring object by calculating these two detected values, A heat-resistant shielding plate is provided at the end of the heat-resistant shielding tube, and an aperture is provided in the shielding plate, and at the end of the heat-resistant shielding cylinder facing the radiometer, one allows the radiant energy from the object to be measured to pass through the aperture, and the other The first is an apparatus for measuring the surface temperature of an object in a reactor, characterized in that two radiometers are arranged to detect radiant energy from the surface of a shielding plate.

Hereinafter, the apparatus of the present invention will be specifically explained based on the drawings.

FIG. 1 is a schematic diagram of the first invention.

In the figure, reference numeral 1 denotes a temperature-measuring object, for example, a belt-shaped steel plate that moves continuously in a direction perpendicular to the plane of the paper. 2 is a heating furnace for heating the steel plate 1.

Note that a heating means used to heat the steel plate 1 in the heating furnace is not shown. A radiometer 3 is provided outside the furnace 2, facing the steel plate 1, and a shielding cylinder 4, which is not water-cooled, is provided in the optical path between the radiometer 3 and the steel plate 1, with a substantially constant gap H between the steel plate 1 and the steel plate 1. and install it. A shielding plate 5 is provided at the end of the shielding tube 4 facing the steel plate 1. FIG. 2 shows a plan view of the shielding plate 5. The shielding plate 5 has a flange on the outer periphery of the shielding tube 4 and is shaped to close the inner periphery of the shielding tube 4, and the shielding plate 5 on the inner periphery of the shielding tube 4 has a An opening 6 is provided in a specific manner. The shielding tube 4 and the shielding plate 5 are connected to the furnace 2.
It acts to shield strong stray light noise from internal walls, etc. The above-mentioned aperture 6 forms a part of the optical path that allows the radiant energy 3'' from the steel plate 1 to pass through to the radiometer 3. In this example, the aperture 6 is semicircular. Various shapes can be adopted as the shape of the opening 6 as long as the above purpose is achieved.The radiometer of the shielding cylinder 4 is located directly above the surface portion 7 covered with the shielding plate 5 on the inner circumference of the shielding cylinder 4. A second radiometer 8 is installed in parallel at the end facing the furnace 3.The second radiometer 8 detects the radiation from the shielding tube, which is heated by the atmospheric temperature inside the furnace 2. Energy, specifically, radiant energy 8'' of the surface portion 7 of the shielding plate 5 is detected. The shielding tube 4 and the shielding plate 5 are heated by the high-temperature atmosphere in the furnace 2, or by other heating means (not shown) as necessary. Since the heating is performed to make the temperature of 2 uniform, it is manufactured using a heat-resistant material that can be used at high temperatures, such as silicon carbide and other heat-resistant alloys.

FIG. 3 is a schematic diagram of the second invention.

In the example shown in FIG. 3, a shielding plate 5 provided on the shielding tube 4 is provided inside the intermediate portion of the shielding tube 4. This shielding plate 5 is provided with an aperture 6 for forming an optical path, and the shielding cylinder 4 is provided directly above the aperture 6.
A radiometer 3 is provided at the upper end. Therefore, the radiant energy 3'' of the steel plate 1, which is the object to be measured, is detected by the radiometer 3. Directly above the surface portion 7 of the shielding plate 5 that is not the open hole 6, and facing the radiometer 3 of the shielding tube 4. A second radiometer 8 is installed in parallel at the end. Thus, the second radiometer 8 detects the radiant energy 8'' of the portion 7 of the shielding plate 5 as described above.The shielding plate 5 provided on the shielding tube 4 shown in FIG.
Although the embodiment in which the aperture 6 is provided at a position shifted from the axis of the shielding cylinder 4 as the position of the aperture 6 is shown, the radiometer 3 and the steel plate 1,
There is no limit to the position of the aperture 6 as long as the relative position of the radiometer 8 and the portion 7 of the shielding plate 5 is properly secured. FIG. 4 shows an example of how the shield tube 4 and the radiometers 3 and 8 are installed inside the furnace 2.

A cooling cylinder 9 is fixedly installed at the upper end of the shielding cylinder 4 and protrudes outside the furnace 2. A sealing material 10 prevents the atmosphere inside the furnace 2 from leaking.

Numerals 11 and 12 are cooling water supply and discharge pipes, and 13 is a box housing the radiometers 3 and 8, and is provided with cooling water supply and discharge pipes 14 and 15 and a purge gas supply pipe 16, respectively.

17 is a filter, and 18 is a purge gas supply pipe for keeping the surface of the filter 17 clean.

Reference numeral 19 denotes a component of a drive device for raising and lowering the shielding cylinder 4.

By adopting the above mounting structure, the shielding cylinder 4 can be installed with a small gap H from the steel plate 1, which is the object to be measured, even when the shielding cylinder 4 is heated by the high-temperature atmosphere inside the furnace 2. , and stably without leaking the furnace atmosphere.
It is capable of detecting two radiant energies of 3'' and 8''.

In the case shown in FIG. 3, the shielding tube 4 can be configured as a blackbody furnace with the shielding plate 5 and the upper shielding tube portion, and the shielding plate 5 and the lower shielding tube portion having the same conditions. As a result, the temperature calculation for the two radiant energies 3'' and 8'' becomes extremely simple. In addition, in the case shown in FIG. 1, the radiation from the shielding cylinder 4 is different in structure between the upper and lower parts of the shielding plate 5, but for example, the lower surface of the shielding plate 5 can be blackened, roughened, etc., or in temperature calculation, a predetermined value can be applied. By adopting the coefficient of , it is possible to make the radiation appear to be the same. As described above, according to the temperature measuring device of the present invention, temperature can be measured using only two radiometers, a heat-resistant shielding tube, and a shielding plate without requiring an auxiliary temperature measuring means such as a thermocouple.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional explanatory diagram of an embodiment in which a shielding plate is provided on the end face of the shielding tube facing the object to be measured, and FIG. FIG. 1 is a plan view of the shield plate, FIG.
The figure is an explanatory cross-sectional view showing an example of how the shield tube and the radiometer are attached.

Claims (1)

[Scope of Claims] 1. A radiometer is disposed facing the temperature-measuring object in the furnace, and a heat-resistant shield tube is provided in the optical path between the radiometer and the temperature-measuring object,
In a device that detects the radiant energy from the temperature-measuring object and the radiant energy from the heat-resistant shielding tube and calculates the temperature of the temperature-measuring object by calculating these two detected values, A heat-resistant shielding plate is provided at the end facing the temperature measuring object, an opening is provided in the shielding plate, and one hole is provided at the end facing the radiometer of the heat-resistant shielding tube to allow the temperature to be measured from the temperature measuring object. 1. An apparatus for measuring the surface temperature of an object in a reactor, characterized in that two radiometers are arranged to detect radiant energy and the other one detects radiant energy from a shielding plate surface. 2. A radiometer is disposed facing the object to be measured in temperature in the furnace, and a heat-resistant shield tube is provided in the optical path between the radiometer and the object to be measured,
In a device that detects radiant energy from the temperature-measuring object and radiant energy from the heat-resistant shielding tube and calculates the temperature of the temperature-measuring object by calculating these two detected values, the heat-resistant shielding tube described above is used. A heat-resistant shielding plate is provided in the middle part, and an opening is provided in the shielding plate, and at the end of the heat-resistant shielding tube facing the radiometer, one allows the radiation energy from the object to be measured to pass through the opening, and the other One is a device for measuring the surface temperature of an object in a reactor, characterized in that two radiometers are arranged to detect radiant energy from the surface of a shielding plate.