JPS5848355Y2 - Blast furnace softening cohesive zone measuring device - Google Patents

Description

[Detailed description of the invention] This invention aims to reduce the level of the softened cohesive zone in the radial direction in the blast furnace.
It relates to a device for measuring shape, behavior, etc.

As is well known, a blast furnace is a device that produces pig iron by charging iron ore, limestone, coke, etc. from the top of the furnace and blowing hot air from below the furnace body to heat and reduce the iron ore. The reduced iron ore fuses together,
There are areas where the melt becomes branch-like and falls off all at once.

The level of such a softened cohesive zone is low in terms of blast furnace operation, and the narrower the width, the better the operational performance will be.

On the other hand, the level, shape, and width of the above-mentioned softened cohesive zone vary depending on the properties of the charge, charge distribution, tuyere speed of hot air, tuyere temperature, etc., and in general, operators can adjust each of these factors as appropriate. By making this change, the blast furnace softening cohesive zone is maintained at a desirable level.

Thus, the blast furnace softening cohesive zone level is an extremely important factor in blast furnace operation, and the level must be measured as accurately as possible.

For this purpose, various methods for measuring the level of the blast furnace softening cohesive zone have been known in the past.
As proposed in No. 140804, Japanese Patent Application Laid-Open No. 51115216, etc., the in-furnace force temperature and the gas composition of either one are measured at two positions above and below corresponding to the same radius within the blast furnace, and the radial direction There is a method of determining the position of the softened cohesive zone using a mathematical model based on actual measurements of the composition, temperature, and other operating conditions of the top gas and total gas at each position, and a method of determining the position of the softened cohesive zone using a mathematical model, as well as a method of determining the position of the softened cohesive zone in a blast furnace, as in JP-A-47-113485. Detect pressure abnormalities (changes in ventilation resistance) that occur when the raw materials are charged differently (e.g. double the ore mixture) and fall into the softened cohesive zone, or iron ore with a lot of special components (e.g. Mn, etc.) There is a known method of estimating the melt gun level from the fluctuations in the tapped iron components by charging the iron into a certain charge.

However, the former method has problems with the accuracy of the mathematical model and how to make assumptions, and the latter method has many estimation calculation factors such as the residence time of the charge in the furnace, so in any case, the accuracy is low. There were problems such as a lack of.

The present invention was devised to solve these conventional problems, and with a relatively simple configuration, it is possible to accurately measure the position of the softened cohesive zone in a blast furnace and the behavior of the lumpy zone leading to it. The aim is to provide a new device.

Next, one embodiment of the present invention will be explained with reference to the attached drawings.
First, FIG. 1 is a schematic diagram of a measurement probe according to the present invention, in which a capsule 2 is fixed to the tip of a heat-resistant flexible tube 1, and a sampling hole 2' is provided at an appropriate position in the capsule 2.
is perforated, and the inside is filled with filter material 3.

Further, a sheathed thermocouple 4 is inserted into the flexible tube 1, and its tip end reaches the inside of the capsule 2.

Such a flexible tube 1 has a length long enough to cover the area from the furnace mouth to the siding level (40 m or more is required in the case of a large blast furnace), and a gas analyzer is connected to the outer tip of the furnace via an adapter 5 and a ladder 6. 7. A gas pressure gauge 8 and the like are connected, and a thermometer 9 is connected to the tip of the thermocouple 4 outside the furnace.

In addition, in this embodiment, a weight 1 is attached to the lower end of the capsule 2.
However, if the cup cell 2 itself has enough weight to fall into the furnace, this weight 10 may be omitted.

Note that distance markers 11 are marked on the flexible tube at regular intervals from the tip inside the furnace, so that the length of insertion into the furnace can be immediately known.

On the other hand, what is shown in FIG. 2 shows a device for feeding the above-mentioned flexible tube 1 into the furnace.
is installed, and a flexible tube guide pipe 14 is connected to the forward end of this feed roller 13.

This guide tube 14 is appropriately inclined, penetrates the blast furnace shell 15, and is extended toward the inside of the furnace.

Further, gate valves 16 and 17 are provided on the side of the blast furnace and the feed roller 13 of the guide tube 14, respectively, and a gas seal portion 1 is provided near the gate valve 17 on the side of the feed roller 13.
8 is provided.

As shown in detail in FIG. 3, this gas seal section 18 includes a seal box 20 into which a sealing material 19 such as a gland packing is inserted, a seal presser flange 21 fixed to the end of one guide tube 14a, and and a flange 22 fixed to the other guide tube 14b, each flange 2
1.22 into the seal box 21) 23
, 233.

In addition, in this embodiment, as shown in FIG. 4, the guide tube 14 inside the furnace is supported by a support plate 24 and a vertical rib 25, and the upper part is covered with a hood 26, so that the guide tube 14 is sufficiently prevented from colliding with the charge. This maintains strength and prevents damage to the guide tube 14.

The above description has been made using the case where there is only one guide tube 14, but when measuring multiple positions in the radial direction inside the furnace, the fifth
As shown in the figure, a plurality of guide tubes 14 etc. are arranged,
The position of the tip of each guide tube 14 in the furnace direction may be changed, and the detailed structure may be changed accordingly.

In addition, in FIG. 2, what is shown at 27 is a pipe for introducing N2 gas into the guide pipe 14.

When using the present invention, first, the gate valve 16 of the guide tube 14 is closed, and the thermocouple 4 is connected from the outer end of the guide tube 14 to the furnace.
After inserting the flexible tube 1 through which it has been inserted, the capsule 2 and the weight 10 are attached to the tip of the flexible tube 1 at the gas seal portion 18.

This operation is performed after removing the bolt donut 23 shown in FIG. 3 and separating the box 28 and flange 22.
Attach the capsule 2 and weight 10 to the tip of the flexible tube 1 that has passed through the tube 1 in the state shown in FIG. 22 is tightened with a bolt donut 23.

Thereafter, when the gate valve 16 is opened and the flexible tube 1 is fed into the furnace by the feed roller 13, the weight 10 and the capsule 2 are released from the inner end of the guide tube 14 inside the furnace along with the flexible tube 1. It falls onto the blast furnace charge surface 28 at a predetermined radial position.

In this state, the weight 10 and the capsule 2 are filled with the charge that has been subsequently charged, and as the load is unloaded, the weight 10 and the capsule 2 descend into the furnace and reach the softened cohesive zone 29.

During that time, the furnace gas entering from the sampling hole 2' of the capsule 2 passes through the flexible tube 1 and reaches the gas analyzer 7 and the gas pressure gauge 8, where the gas composition and gas pressure are continuously measured. The temperature inside the furnace is also continuously measured by a thermometer 9 connected to the pair 4.

Further, the softening cohesive zone can be determined based on the measured values of the temperature, pressure, and gas composition and the rate of change thereof (rapid change), or data from a softening experiment under load.

Furthermore, the insertion length of the flexible tube 1 is determined by the distance marker 11.
By reading the information from
It is also possible to understand changes in pressure and gas components.

Furthermore, in the present invention, the distribution shape of the softened cohesive zone 29 in the radial direction can also be measured by lowering the flexible tube 1 at a plurality of points in the radial direction of the blast furnace as shown in FIG.

Incidentally, while performing such measurements, gas in the furnace enters from the tip of the guide tube 14 inside the furnace, but this gas is sealed by a sealing material 19 installed inside the weight charging device 18.

After completing such measurements, the flexible tube 1 and the thermocouple 4 inserted therein are cut behind the feed roller 13, and after this cut passes through the gate valve 17, the gate valve 1
By closing 7, the series of operations is completed.

Note that the cut flexible tube 1 and thermocouple 4 become the contents of the blast furnace.

As explained above, according to the present invention, it is possible to easily and safely measure the position and shape of the softened cohesive zone and the behavior of the lumpy zone in a blast furnace, and it is not affected by external factors unlike conventional methods. This is an extremely effective device with various advantages such as being able to obtain extremely accurate data and understanding the correspondence with blast furnace operation results.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the flexible tube according to the present invention, Fig. 2 is a schematic diagram of the flexible tube feeding mechanism, Fig. 3 is a sectional view showing details of the gas seal, and Fig. 4 is a schematic diagram of the flexible tube according to the present invention. Sectional view showing another embodiment of the furnace inner guide tube in the invention, No. 5
The figure is a schematic diagram showing the implementation state of the present invention. In the figure, 1 is a heat-resistant flexible tube, 2 is a capsule, 2' is a sampling hole, 4 is a thermocouple, 10 is a weight, 12 is a trolley, 13 is a flexible tube feed roller, 14 is a guide tube,
Reference numerals 16 and 17 indicate a gate valve, and 18 indicates a gas seal portion.

Claims (1)

[Scope of utility model registration request] A capsule is fixed to the tip of the capsule, and a heat-resistant flexible tube is inserted into the blast furnace from the side of the top of the blast furnace. The feeding mechanism for the heat-resistant flexible tube is comprised of a guide tube leading into the furnace and a feed roller, and the tube guide tube is provided with an in-furnace gas gate valve and a gas seal part. A blast furnace softening cohesive zone measuring device characterized by being provided with.