JPH01184388A - Method of measuring burning material in kiln - Google Patents

Abstract

PURPOSE:To make it possible to measure with a good reproducibility a highest tempera ture of thermal history of a material to be burnt by charging refractory blocks accom modating temperature measuring ceramic rings and having a heat transfer characteris tic which is substantially the same as that of the burning material, and after burning the burning raw material, and measuring the variation in the dimension of the tempera ture measuring ceramic rings. CONSTITUTION:Five accommodating space 13 are provided on the upper surface of refractory blocks 11. Four temperature measuring ceramic rings 12 are accommodated in four stages in one accommodating space 13 by a partition lid 14 made of a refrac tory material having a heat transfer factor which is substantially the same as that of the burning material 2. Refractory blocks 11 accommodating temperature measuring ceramic pings 12 and having a heat transfer factor substantially the same as that of the burning material for charged into a kiln 1 together with the burning material and are passed through a burning step, whereby the temperature measuring ceramic ring receives a thermal history which is the same as that of the burning material. Accordingly, the highest temperature of thermal history of the temperature measuring ceramic ring obtained from the change in the dimension of the temperature measuring ceramic ring 12 is equal to the highest history temperature received by the burning material.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for measuring the historical maximum temperature experienced by powder when it is fired in a firing furnace, particularly for tunnel type furnaces with a long furnace length. The present invention relates to a temperature measurement method suitable for a firing furnace.

<Prior Art> When firing powder in a firing furnace, it is important to make the temperature history of the powder in the firing case uniform, and for this purpose it is necessary to measure the temperature of the powder.

A conventional method for measuring the temperature of powder will be explained with reference to FIGS. 7 and 8. In FIG. 7, 1 is a tunnel type firing furnace, and a firing case 3 consisting of a base plate 4 and a frame 5 containing powder 2 moves on rollers 6 in the direction of the arrow. In order to measure the temperature of the powder 2, a plurality of thermocouples 7 are set inside the powder 2 in an appropriately selected firing case 3, as shown in FIG.

Generally, about five thermocouples 7 are set because it is necessary to know the temperature distribution of the powder. 8 is a protective tube for the thermocouple, 9 is a compensating lead wire in the protective tube for the thermocouple 7, and 10 is a thermometer outside the furnace.

<Problems to be Solved by the Invention> However, in the conventional temperature measuring method described above, as the firing case 3 in which the thermocouple is set moves inside the furnace, as shown in FIG. It was an extremely inefficient operation as it had to be fed into the furnace.

In addition, there were cases in which the protective tube 8 of the thermocouple 7 was displaced during movement within the furnace, and the temperature of the atmospheric gas instead of the powder was measured. In addition, the compensating conduit 9 may be exposed to a high temperature atmosphere and the measurement current may leak, or the compensating conduit 9 may become tangled and break. These problems became particularly serious when the length of the firing furnace was 10 m or more.

Furthermore, the cost of thermocouples was high, which caused problems.

An object of the present invention is to provide a temperature measuring method that solves the above problems.

Means for Solving the Problems> The present invention involves charging a refractory block containing a temperature-measuring ceramic ring and having heat transfer characteristics substantially equal to that of the firing raw material into a firing furnace together with the firing raw material, and after firing the firing raw material. By measuring the change in dimensions of the ceramic ring for temperature measurement, the highest temperature in history of the ceramic ring for temperature measurement is determined, and this temperature is taken as the highest temperature in history for the firing raw material.

Function> By charging the refractory block containing the temperature-measuring ceramic ring and having a heat transfer coefficient approximately equal to that of the firing raw material into the firing furnace together with the firing raw material, and allowing the firing process to proceed, the temperature-measuring ceramic ring is It undergoes the same thermal history as the firing raw material. Therefore, the maximum historical temperature of the temperature-measuring ceramic ring determined from the change in the dimensions of the temperature-measuring ceramic ring is equal to the historical maximum temperature experienced by the firing raw material.

<Example> FIG. 1 shows a first example of the apparatus used for carrying out the present invention, in which 11 is a refractory block having approximately the same heat transfer coefficient as the firing raw material 2, and the inside of the refractory block 11 is The temperature measuring position 1 is provided with an accommodation space 13 for accommodating a temperature measuring ceramic ring 12.

In the embodiment shown in FIG.
1.Four ceramic rings 12 for temperature measurement are arranged in four stages per housing space 13 by partition lids 14 made of a refractory material and having a heat transfer coefficient substantially equal to that of the firing raw material 2. is housed in.

In addition, the ceramic ring for temperature measurement can use the thing generally marketed.

When this example was applied to a firing furnace with a furnace length of 10 m, the cost of thermocouples and the work of feeding the thermocouple into the furnace were eliminated, so the cost could be reduced to several hundred pounds compared to the conventional method described above. In addition, the temperature measurement accuracy was high and the reproducibility was good, so it could be used for normal process control.

FIGS. 3 and 4 show a second embodiment of the refractory block used in the implementation of the present invention. In this case, thin refractory blocks 15 are stacked one on top of the other. 17 is the upper cover of the refractory block.

FIG. 4 shows an example of the refractory block 15. FIG. 4(a) shows one with five holes 16, and FIG. 4(b) shows an example of the refractory block 15.
In this example, six holes 16 are provided. The specific dimensions are
When using a ceramic ring for temperature measurement with an outer diameter of 20 mm, an inner diameter of 10 mm, and a thickness of 8 mm, the thickness of the refractory block 15 may be 20 mm, and the dimensions of the hole 16 may be approximately 23 mm in inner diameter and 10 mm in depth.

The feature of this method is that the refractory blocks 1
5 can be selected as appropriate.

It also has the advantage of being able to prevent the intrusion of atmospheric gases and reducing measurement errors.

Figures 5 and 6 show a third embodiment of the refractory block used to carry out the present invention, and the degree of freedom in selecting temperature measurement positions is greater than in the second embodiment. It is something.

As shown in FIG. 5, a unit refractory block 18 with one hole 16 for accommodating the temperature measuring ceramic ring 12 and a unit refractory block 19 without a hole are prepared, and these are assembled as shown in FIG. 6(a). ), the temperature measurement position can be arbitrarily set, and the refractory blocks without holes are stacked on top of each other, as shown in Fig. 6(忤).

<Effects of the Invention> According to the method of the present invention, the highest historical temperature of a fired object in a firing furnace can be measured with good reproducibility at low cost, and information useful for managing firing operations can be obtained. It is also convenient for measuring temperatures at multiple locations, and is particularly effective for measuring temperature distribution.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an example of a firing furnace to which the method of the present invention is applied, Fig. 2 shows a first embodiment of a refractory block used in the method of the present invention, and Fig. 2(a) is a plan view, Fig. 2 (
b) is a sectional view taken along the line I--I in FIG. 2(a). FIG. 3 is a perspective view showing a second embodiment of a refractory block used in the method of the present invention. FIG. 4 is a perspective view showing a specific example of the refractory block shown in FIG. 3. 5 and 6 show a third embodiment of the refractory block used in the method of the present invention, FIG. 5 is a perspective view of the unit refractory block, and FIG. 6 is a plan view of the unit refractory block. It is a combined perspective view. FIG. 7 is a cross-sectional view for explaining a method of measuring the temperature of powder in a conventional firing furnace, and FIG. 8 is a partially enlarged view of FIG. 7. DESCRIPTION OF SYMBOLS 1... Firing furnace, 2... Firing object, 3... Firing case, 4... Base plate, 5... Frame,
6... Roller, 11, 15.18.19... Refractory block, 12... Ceramic ring for temperature measurement, 13... Accommodation space, 14... Partition lid, 16...
- Hole, 17...Top lid. Patent applicant Kawasaki Steel Corporation Figure 1 Figure 2 (b) Figure 3 Figure 4 (a) Figure 4 (b) Figure 5 (a) IR Figure 5 (b) Figure 7

Claims (1)

[Claims] A refractory block containing a temperature-measuring ceramic ring and having heat transfer characteristics substantially equal to that of the firing raw material is charged into a firing furnace together with the firing raw material, and after the firing raw material is fired, a change in the dimension of the temperature-measuring ceramic ring is measured. A method for measuring the temperature of a firing raw material in a firing furnace, characterized in that the historical maximum temperature of the ceramic ring for temperature measurement is determined by the above-mentioned method, and this temperature is set as the historical maximum temperature of the firing raw material.