JPH0641623A - Temp. measuring method in blast furnace and probe for temp. detection - Google Patents

Abstract

PURPOSE:To provide an inexpensive and speedy measuring method and temp. detection probe for the in-furnace temp. of blast furnace. CONSTITUTION:After the temp. sensing probe, which is provided with a temp. measuring element at the tip having a tip cap thereon, is pushed into blast furnace, the temp detection probe is pulled out so as to detach the tip cap and executes temp. measuring. The probe is provided with the temp. measuring element at the tip part of the probe main body, which is capable of bearing the pushing in compression force in the longitudinal direction, the tip of the probe main body is covered with the tip cap so as to easily detach by pulling out the probe main body, the whole probe of a non water cooling structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the temperature inside a blast furnace for iron making, and a temperature detecting probe particularly suitable for this purpose.

[0002]

2. Description of the Related Art It is very difficult to measure the temperature inside a blast furnace. That is, it is difficult to insert the temperature detecting end into a furnace body filled with iron ore, coke, etc. Previously, it relied solely on the optical method of observing from the glass window of the peephole in the tuyere, but this method is extremely limited in the measurement points and can only measure to the core surface layer.

In addition, as another method, a coke sampler is inserted during a break of the air to collect coke, and the hysteresis temperature is measured. This is because carbon in coke changes from amorphous carbon to graphite when exposed to high temperature. This takes time for the analysis results to be known, and it is impossible to know the current state of the furnace. Also, the data is the maximum temperature that the coke has received so far and does not directly detect the temperature.

In recent years, a method of inserting a heat-resistant sonde into a furnace and performing temperature measurement at the same time as other measurements such as gas sampling has come into use. This method is structurally complicated and expensive, such as a water-cooled structure for imparting heat resistance. Also, the temperature distribution can be examined by changing the insertion depth in the horizontal direction, but the temperature distribution in the vertical direction cannot be measured.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems concerning the temperature inside the furnace of a blast furnace, and is to measure the temperature inside the furnace quickly and inexpensively with a simple device.

[0006]

DISCLOSURE OF THE INVENTION The present invention is to solve the above-mentioned problems by providing a temperature measuring element at the tip portion, and the temperature measuring element accommodating portion covered with a tip cap for temperature detection. After pushing the probe into the blast furnace, the temperature measuring method in the blast furnace is characterized in that at the start of temperature measurement, the temperature detecting probe is pulled out and the tip cap is detached to measure the temperature. A temperature-measuring element is provided at the tip of the probe body that withstands the compressive force of pushing, and the tip of the probe body is covered with a tip cap so that it can be easily removed by pulling out the probe body. A temperature detection probe having a water-cooled structure.

[0007]

In the present invention, the temperature is measured by pushing the temperature measuring probe having the temperature measuring element at the tip thereof into the furnace. Push the temperature measuring probe into the furnace from the opening such as tuyere when there is no wind. It is necessary to overcome the resistance due to the charging of coke, iron ore, etc. in the furnace. For this reason, the probe is made of a steel pipe or the like, and it is necessary to have such strength that it does not buckle due to the compressive force in the lengthwise direction when it is pushed.

Further, since the tip end is also pushed in such a manner as to be inserted between the filling materials in the furnace, the lid, that is, the tip end cap must be provided. This tip cap also needs to be made of steel or the like and have sufficient strength like the body of the probe. For this reason, it becomes large corresponding to the thickness of the probe, and the cavity inside the tip cap is large. Therefore, it is impossible to measure the temperature with the tip cap, and it is impossible to measure the temperature.

Therefore, it is necessary to remove the tip cap and open it after inserting the probe into the furnace of the blast furnace. Therefore, the tip cap does not stick in the inserted state and is integrated with the probe body when pushed in, but if pulled out, it can be easily detached from the probe body due to the frictional force between the tip cap part and the furnace interior contents. To do so. Therefore, after the push-in is completed, the temperature measuring element is exposed and measurement can be performed by pulling out a little at the time of starting the temperature measurement. A thermocouple is usually used for this temperature measuring element, but the element itself may be exposed naked or may be contained in a protective tube which is generally used.

The temperature of the probe can be measured while pulling it out and changing its position. However, when the temperature measurement is completed, it is completely withdrawn from the blast furnace and discarded. Therefore, the probe may have a non-water-cooled structure as a whole, and may be simply insulated inside.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a method for measuring temperature inside a blast furnace 8 according to the present invention. Reference numeral 1 denotes an insertion device which hooks a drive wheel 3 holding a probe 2 on a chain 4 and inserts it by feeding the chain. The chain 4 is stretched between the two sprocket wheels 5a and 5b, and the power of the motor 6 is transmitted and driven. If the tilting jack 7 is used to move the sprocket wheel 5b to the position of 5c, for example, the probe 2 can be inserted diagonally. Although FIG. 1 shows a method of inserting the probe from the tuyere 9, the temperature can be measured by providing an opening at an arbitrary position of the blast furnace.

FIG. 2 is a sectional view showing an example of the temperature measuring probe of the present invention. The probe body 21 is made of a steel pipe having an outer diameter of about 43 mm. A heat insulating material 22 is provided inside, and a compensating lead wire 24 passes through. A thermocouple 23 is provided at the tip portion, and a tip cap 26 having substantially the same diameter as the probe body is provided at the tip portion of the probe body 21 so that the tip portion can be easily detached from the insertion portion 27 when the tip portion is pulled. It has become.

In this embodiment, the tip cap 26 is further covered with a protective cap 25 made of aluminum so that it melts and disappears at the time of temperature measurement. As described above, it is also possible to use a thermocouple protection tube made of porcelain or metal, which is commonly used.

[0014]

According to the present invention, the temperature can be measured by pushing the probe having a simple structure into the blast furnace, and the temperature can be measured not only in the horizontal direction but also in the oblique and vertical directions.
Further, since the temperature measuring probe has a structure in which the tip cap is detached by pulling it out, the temperature measuring element is exposed and the temperature can be accurately measured by pushing it into the furnace and then pulling it out a little. In addition, the non-water cooling structure makes it possible to manufacture at low cost, and there is no risk of an explosion accident due to water leakage, which is safe.

[Brief description of drawings]

FIG. 1 is a diagram showing a temperature measuring method in a blast furnace according to the present invention.

FIG. 2 is a cross-sectional view showing an embodiment of a temperature detection probe of the present invention.

[Explanation of symbols]

 21 probe body 23 thermocouple 26 tip cap 27 insertion part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Morimasa Ichida 20-1 Shintomi, Futtsu City, Chiba Shin Nippon Steel Co., Ltd. Technology Development Division

Claims (2)

[Claims] 1. A temperature detecting element is provided at a tip portion, and a tip cap is put on the temperature measuring element housing portion. After the temperature detection probe is pushed into the blast furnace, the temperature detection is started at the start of temperature measurement. A method for measuring temperature inside a blast furnace, characterized in that the temperature is measured by pulling out the probe for the probe and detaching the tip cap. 2. A temperature measuring element is provided at the tip of the probe body that withstands a compressive force pushed in the lengthwise direction, and a tip cap is provided at the tip of the probe body so that the tip cap can be easily detached by pulling out the probe body. Is covered,
A temperature detecting probe characterized by having a non-water-cooled structure as a whole.