JPS6024307A - Temperature measuring device on front surface of tuyere in blast furnace - Google Patents

Abstract

PURPOSE:To provide a titled device which enables continuous measurement of the temp. on the front surface of the tuyere of a blast furnace under operation by providing an optical system of which the photodetecting top end is directed to the front surface of the tuyere into a blast pipe installed coaxially to the small-sized tuyere cooling box provided to the tuyere. CONSTITUTION:A small-sized cooling box 3 and a large-sized cooling box 4 are provided in the hole penetrating through a shell 1 and refractory brick 2 of a blast furnace and a hot wind feed pipe 5 provided with a fuel feed pipe 6 is installed in the direction approximately coaxial with the box 3 to constitute a tuyere for blowing blast. A temp. measuring device consisting of inserting an optical fiber 9 of an optical system through a pipe 8' into said pipe 5, directing the photodetecting end thereof to the front surface of the tuyere and connecting the rear end thereof to a photoelectric transducer 11 of an optical temp. measuring device 10 on the outside of the blast furnace is provided to the above-mentioned tuyere. The above-mentioned photodetecting end conducts the ray incident thereto from the front surface via the fiber 9 to the device 10 by which the temp. on the front surface of the tuyere is detected. The temp. control of the blast furnace is thus made possible.

Description

[Detailed Description of the Invention] A modern blast furnace is a vertical shaft furnace with four teeth reaching approximately 30 m in length and a circular cross section, and is a container with 11 of the iron shells lined with refractory bricks. .

In the F part of the genitals, there are many tuyeres arranged at equal intervals pointing at a certain point on the central lead If line of the furnace, and the tuyeres are arranged at equal intervals.
''s FiIIIj is equipped with a sump for storing mhW-generated pig iron and slag, and several tap holes for taking this out to the outside.

Meanwhile, at the top of the container is iron ore as the main raw material.

A furnace top mount is installed to charge coke, limestone, and other materials into the furnace while maintaining air quality with the outside.

The main raw materials, iron ore and coke, are alternately charged into the furnace by a charging device. The input raw materials are deposited in layers in the furnace to form a light filling hole.

Accordingly, a large amount of high-temperature carbon oxide gas (hereinafter referred to as hot gas) is generated. The generated gas at a temperature of 10,000 yen (theoretical temperature 34.7%) gradually rises through the layered charge layer and reaches the top of the furnace.

This process involves heat exchange between gas and solid and gas reduction (
iron ore is classified as high-grade II.
Gravity 1111 while changing its properties from a monster to a lower grade monster!
and enter the high temperature range (1000°C or higher).

The iron ore (low and rJ2 compound) that has been treated in the high temperature range comes into contact with the coke in the high temperature range that is present in large quantities, and a solid reaction (referred to as direct reduction) proceeds between the two to complete the reduction.

After reduction, the iron ore becomes pure iron and solid particles that replace gangue and generates carbon monopolyde gas. The generated carbon monoxide gas joins the flow of honshu gas rising from below and rises inside the furnace.

Therefore, the carbon monoxide gas network in the direct reduction region rises in the layer at a higher concentration (approximately 40%) than the theoretical value and enters the indirect reduction region.

On the other hand, the solid particles containing pure iron and gangue come into contact with coke at 4.71171 degrees in the direct reduction region, and the pure iron in the particles begins to be sucked back. If suction back occurs, iron):ll
The li point decreases, and iron-carbon alloys (pig yI
+ ) is produced in liquid form. However, 1111 (stone) has a higher melting point compared to the alloy. Therefore, the particles still remain solid.

In the process of converting the direct reduction region to p=e F, the gangue content in the particles reacts with the bath agent (autonomous O, magnetia) to form a compound with a low amorphous point, such as silicon 1fll (5i02)35-
7%.

The droplets are composed of slag (hereinafter referred to as F slag) such as 12.2% obfuscated alumina (AQ203), 40-6% lime (Cab), and 14.5% other trace amounts. Since the liquid droplets are further heated in the high temperature range, their viscosity further decreases, and the pig iron 2 and the slag separate due to the difference in density.

Separated pig iron grains reach the hearth and accumulate in the molten pool while being sucked back.

Similarly, as the slag passes between high-temperature coke particles, it is refined into slag of the final composition before reaching the pool and reaching the eaves.
Small-grade slag accumulates on the pig iron.

It burns, producing high heat and large amounts of carbon monoxide gas. In addition, the ash in the coke becomes slag and combines with the slag generated by gangue and solvent.
．． Then I splashed myself in a pool of hot water.

The pig iron and slag stored in the hearth in this way are discharged to the outside from several tapholes every few minutes.
Work is underway to send it to the investigation department.

This governs blast furnace operation, fuel efficiency, and even pig iron content. The factor is the iron content of the iron ore.

In addition to raw material factors such as the appropriate particle size and uniformity of iron ore and coke, and the degree of hotness of coke,
Flow of waste in the furnace and 2I! For example, what is the distribution state of the high heat and large amount of Bosch gas generated in the combustion zone at the tip of the small tuyere cooling box to the upper direct reduction area, and also the indirect reduction IJ or gas seeds, There were issues such as how to distribute the temperature, and for that reason, there was a Z-woman who specifically measured the temperature near the tuyere.

However, until now, there has been no temperature measuring means suitable for continuous temperature measurement near the tuyere under Fjr rm degrees and high j royal power.

Therefore, this invention solves these problems in blast furnaces)! It was designed to make decisions.

In addition, in the 1: part of ν, an annulus d is installed to distribute the hot air at the cylinder temperature sent from the frost blast furnace to the small tuyere cooling boxes arranged circumferentially.

As shown in Fig. 1, each tuyere has a small tuyere cooling hole (3) installed in a hole penetrating the blast furnace iron skin (υ) and refractory brick (21), a large tuyere cooling hole 410 (J), It is equipped with a hot air supply pipe f51 that is matched with this small tuyere cooling box (6), and a fuel supply pipe (6) that blows fuel into this hot air supply pipe (5). Rear +1
The t11 side is connected to the annular pipe, and the small tuyere cooling box (3) and the fire tuyere cooling box (4) are provided with cooling water inlets and outlets for circulating the cooling water. .

Then, a small tuyere cooling box (31,0 has many complex) partitions is provided to efficiently circulate the cooling water. For this reason, it is difficult to apply special processing such as providing a 1"1 hole in the small impeller used in the cooling phase (6). Become.

Therefore, as shown in the 1IJ plane view in Figure 2, the small wing 1
A pipe (7) is provided along the outer peripheral wall of the pipe (7), and a pipe (18) is inserted into the groove (7) by bath welding. The tip of the optical system that guides the layered light beam (from the aperture) is pushed through.

However, the small tuyere cooling box (through the 61 and the Bino+81
If it is possible to install a small tuyere cooling box (
Instead of providing the pipe (8) on the outer peripheral wall of the pipe (6), the pipe (8) can be provided by penetrating the small tuyere cooling cutter (6).

As an optical system for guiding the light rays radiated from the wing 1+iiJ surface, various types such as optical fibers, optical pipes, and lens systems can be used.

For example, when an optical fiber is used as the optical system, the tip of the optical fiber i', fl-(91 is located near the tip of the pipe f81 and is directed into the blast furnace, and the rear end is Optical +l, such as a color meter installed at the exit point
1lI > IM device t (10) optical city conversion element f(11
).

To prevent this optical fiber 19) from being burnt out, be sure to
), and the optical fiber (9) should be able to withstand the high pressure, 16-channel cooling gas flow. Vibrations occur in the optical fibers 19) of the bamboo due to the gas flow,
The vibration may damage the optical fiber (91).

For this purpose, the optical fibers (9) are supported concentrically within the pipe (8), and the optical fibers (9) are extended radially so as to adjust the gas flow, as shown in the cross-sectional view of Figure 2. All you have to do is attach a plurality of split pieces (12) and then insert them into the pipe (8).

A beam of light emitted from a high-temperature object on the river surface of the blast furnace tuyere 1 enters the tip of the optical fiber 19).
) via optical till? It is also possible to lead it to the iA device (10).

In the optical heating device (10), the beam of light from the blast furnace internal force thus affected is received, and the temperature of the surface for blade I is determined based on this beam.

In addition, as shown in Figure 6, a pipe (8'f) similar to the fuel supply pipe (6) that blows fuel into the hot air supply pipe (5)
and optical d, il in this pipe (H).
, ili j91 may be inserted therethrough.

In this case, lI:ta from the tuyere lII + the high temperature object
The emitted light beam passes through a small tuyere cooling box (6) and a hot air supply tube (5), enters the end of the optical fiber (9), passes through the optical fiber 19), and enters the optical fiber (19). vtt, (10
)'.

As explained above, according to the bending device of the present invention,
Since the temperature curve of the opening surface of the tuyere in the operating blast furnace becomes possible, the blast furnace can be maintained in a stable condition, and
You can improve the quality of the pig iron you tap by one level.

[Brief explanation of the drawing]

The first detailed diagram shows the April mouth of the blast furnace of this invention! ] U mi
t17: Turn vertical 1 () that marks one embodiment of the ut device to surface ``
1, Ward 2, cut at line u-, u in Figure 1] Jr.
It is a vertical cross-sectional view showing another embodiment of the present invention, including the side 11'Jr 1llj Ig+ and the 1st 1Xlf. 6...Small tuyere cooling box 4...Large tuyere cooling box 5 6 11...Photoelectric transformer cable f-

Claims (1)

[Claims] A small tuyere cooling oil i installed as a headwind inlet of the blast furnace, a south IQ piezo installed almost coaxially with the small tuyere cooling i4'i, and a matchmaker installed from the outside in the Ayanagi paino. , an optical system whose light-receiving tip is directed in the direction of the tuyere i]II, and which guides the light beam incident from the 1lfJ surface to the outside of the blast furnace; The optical contamination that determines the temperature of the IJ! 1. A temperature measuring device for an open side surface of a blast furnace, characterized in that the temperature measuring device is equipped with a device.