JPS5916917A - Built-in type vertical sonde - Google Patents

Abstract

PURPOSE:To quantitatively grasp physical chemical behavior in blast furnace, by a method wherein a duct is built in a lance and a flexible probe is guided therewith and forced to descend into blast furnace from its end opening part. CONSTITUTION:The duct 22 having tip opening part 22-1 which conducts flexible probe 23 and makes it 23 descend into blast furnace, is built-in a lance 21. In the trunk of lance 21, the duct 22 is provided with a penetrating hole so that the end opening part 22-1 of duct 22 is forced to face on the inside of blast furnace. The flexible probe 23 is sent into the duct 22 with, for example, reel or pinch roll and descends according to the descent of burden into blast furnace. When the detection terminal 23-1 of flexible probe 23 is provided with measuring point of thermocouple, gas sampling hole, etc., measuring temperature in blast furnace and defection of gas composition and gas pressure becomes possible to be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sonde for measuring temperature, gas composition, gas pressure, packed bed thickness (corresponding to raw material type) inside a blast furnace.

Conventionally, various sondes have been proposed to understand the physical and chemical dynamic behavior inside a blast furnace.

For example, in order to find out the temperature or NOx composition at a predetermined location in the blast furnace, a so-called horizontal probe is installed that can be freely displaced in the radial direction of the blast furnace, and a so-called vertical probe is installed in which a sonde or probe is lowered vertically from the top of the blast furnace. Sonde is proposed.

As shown in Fig. 1, the conventionally proposed vertical sonde has a rigid body sonde 3 inserted vertically from the top l of the blast furnace through a seal 2 to lower (unload) the charge into the blast furnace. Accordingly, the sonde is lowered to measure the temperature or sample the gas at each predetermined radial position in the blast furnace.

On the other hand, a conduit with its tip opening facing the top of the blast furnace, especially the space above the raw material charging surface, is installed, and a flexible probe is dropped onto the raw material charging surface to lower the raw material (unloading). There is also one that lowers the glove depending on the situation.

However, in the above-mentioned device in which the rigid sonde is lowered in the direction of the blast furnace axial force, the raw material charging distribution control equipment, ie, the dog, the small bell, and the movable armor
1 or the PW type distribution device, the insertion position of the resonde is regulated and is limited to a range within 2 to 3 m in the radial direction from the blast furnace wall. Also, since charging is done from the top of the blast furnace, for example, if you want to measure a range of 20 m from the raw material charging surface, the distance from the top of the blast furnace to the raw material charging surface is approximately 15 m.
The length of the sonde is 35 m. Therefore, the distance between the tip of the sonde in the furnace when the sonde descends the most and the top of the sonde when the sonde is pulled out vertically is '
The distance is 70 m, which makes the device large and the equipment cost expensive, which is impractical.

Furthermore, the time the sonde stays in the blast furnace is 2 to 5 hours, and the sonde must be cooled while being exposed to high temperatures. However, since the sonde is extremely long, it is difficult to use a safe heat pipe method. However, in the case of a water-cooled system, there is a risk of explosion if the sonde is damaged. On the other hand, in the case of gas cooling, a large cooling area is required due to the heat capacity of the medium, resulting in a large 7 sonde. Furthermore, even though the trench is a rigid body sonde, the length of the sonde is a dog, so there are problems such as the amount of deflection that cannot be ignored.

On the other hand, conventional flexible vertical probes are easy to use, but the measurement point estimation is uncertain.

As shown in FIG. 2, the flexible probe 13, which is lowered through the noon 12, is swept away to the center by the first dump after being inserted by the charge.

Furthermore, the flexible globe is moved to the center of the furnace in the radial direction by the second and third dumps, and the flexible probe is pulled in at a speed faster than the charging material descending speed, and the flexible probe is inserted and moved. does not correspond to the vertical position of the blast furnace.

Furthermore, how to apply rear tension to the flexible probe (
At i'J, a force is applied toward the center of the blast furnace in the radial direction, making the position of the tip of the probe in the radial direction of the blast furnace uncertain. As shown in FIG. 3(d), the flexible probe 13 having a detection end 13-'l'f: Raw material charging (dump) (1
4-2) to the center of the blast furnace in the radial direction. Furthermore, as shown in FIG. 3(b), the detection end is removed during the next raw material charging (14-3). Flexible globe] 3 is flowed toward the center in the radial direction of the blast furnace than the position 3-1. In order to know the position of the tip (detection end -1) in the axial direction of the blast furnace by the supply length of the flexible globe 13, the flexible probe 13 shown in FIG. As shown in Figure 3 (
As shown in CJ, the position of the tip (detection end 13-1) is shifted to the center in the blast furnace radial direction and to the top in the vertical direction. On the other hand, E.J.
If backward tension is not applied to the flexible probe 13, the flexible globe 13 will flex significantly in the blast furnace, and the feed speed or length of the flexible globe 13 and the detection end code will be affected by the displacement of the charging material into the blast furnace. 3-1, the three-dimensional position inside the blast furnace will no longer correspond (Figure 3 (dJJ-1: This eye) Although it is possible to measure the temperature inside the blast furnace with a flexible glove. This sonde is not suitable for gas sampling or measuring the thickness of one layer of raw material.

On the other hand, when using horizontal sondes to measure the temperature and gas composition at several positions in the height direction of the blast furnace, it is necessary to place several sondes in the height direction of the blast furnace, which may cause interference with equipment external to the blast furnace. Actually it's not possible.

This invention solves the above-mentioned problems with conventional sondes, and makes it possible to measure temperature, gas composition, gas pressure, and charging material layer thickness at any three-dimensional position within a blast furnace. The aim was to obtain a means of measurement.

Its features include (1) one or more conduits having an opening at the tip for guiding the flexible globe and lowering the flexible probe in the blast furnace; A rigid lance that has an opening in the axial tip or body part that exposes the tip opening to the outside, and that extends in the radial direction of the blast furnace in a packed bed in the blast furnace, and a flexible probe that is fed into the conduit. This is an embedded vertical sonde consisting of a feeding means, and this lance is movable in the radial direction of the blast furnace.

The present invention will be explained in detail below.

As mentioned above, problems with conventional flexible vertical sondes occur during the process of charging raw materials into the blast furnace. Charging 2 In a large blast furnace, if the flexible probe is inserted from a position below the charging surface of the dump, at a depth of about 1 m from the charging surface, the probe will move in the radial direction of the blast furnace. It was found that there was no change in position.

Furthermore, when the probe is initially inserted, a slight backward tension is applied to the globe, and it is lowered at a speed of approximately 80 h, which corresponds to the average descending direction of the charged material. It turned out that it was possible to make it descend. This development ψ1 was completed based on the findings of Tonot et al.

This invention will be explained based on FIG. 4 showing one embodiment thereof.

In FIG. 4, 2J is a lance, which extends in the blast furnace radial direction at a position deeper than two dumps from the raw material charging surface in the blast furnace, and is provided so as to be movable forward and backward. The lance 21 is preferably made of rigid, heat-resistant alloy steel, and is cooled by a hydraulic pipe or water cooling means, if necessary. 22
A conduit is built into the wide lance 2J, and the flexible probe 2
3 is guided and lowered into the blast furnace through the end opening (22-1). In the body of the lance 2J, a conduit 22 is installed to allow the end opening (22-1) of the conduit 22 to enter the blast furnace.
It has a through hole. The end of the conduit 22 located outside the blast furnace has a 7-rule 24, and a 7-rule is provided between the hollow part of the conduit and the probe 23. The flexible tube 23ij, for example, is fed from a reel into the conduit by a pinch roll (not shown) and is lowered in accordance with the lowering of the contents in the blast furnace.

When the flexible probe 23 descends inside the blast furnace, the flexible probe 23 is lowered at a speed of about 80% of the descending speed of the blast furnace charge until the probe is inserted (a descending distance of about 2 m). 23 in the radial direction of the blast furnace can be further reduced. The tip of the oJ flexible probe 2 mouth (detection end 23-]-) is provided with, for example, a thermocouple measurement point, a gas sampling hole, etc., so that the vertical direction inside the blast furnace can be measured at a predetermined position in the radial direction inside the blast furnace. It is possible to measure temperature, gas composition, and gas pressure at any location.

Furthermore, by configuring the flexible probe 23 with a high tensile strength 44, it is possible to pull up the flexible probe 23, and by using the electrode type glove, each raw material layer charged, for example, an ore layer, etc. It is DJ capability to measure the thickness of the coke layer.

This electrode type probe is the detection end 2 of the flexible probe 23.
3-1 is provided with an electrode, and the positions of the electrodes (detection ends) of the two detection ends 23-1 are set to be different in the blast furnace axial direction, and the conductivity between the electrodes is measured. Furthermore, by stopping the descent of the flexible probe, it is also possible to detect the rate of descent of the charged material within the blast furnace.

FIG. 5 shows another embodiment of the present invention. In this example, the lance 21 is inserted from two different positions in the axial direction of the cylinder furnace, and the flexible globe 23 is lowered in the axial direction of the blast furnace from three different positions in the radial direction of the furnace, each at an arbitrary position in the axial direction of the blast furnace. Gas composition (A),
temperature #(θ), gas IAi force (P).

Charging material layer thickness (d), charging material descending speed (unloading) (V
).

Since this invention is constructed and operated as described above, it is possible to measure the temperature at every position in the blast furnace, the gas composition, the gas pressure, the thickness of the layer of charged material, and the rate of descent of the charged material. This has the effect of making it possible to quantitatively understand the physical and chemical behavior inside the blast furnace, which can be detected, and thereby greatly contributing to the advancement of blast furnace technology.

[Brief explanation of drawings]

FIG. 1 shows a conventional vertical sonde, FIG. 2 shows a conventional flexible vertical sonde, and FIG. 3(a). (b+, (C) l (dl) In a conventional flexible vertical sonde, the detection end of the flexible globe or the flexible probe fluctuates greatly depending on the movement of the raw material charged into the blast furnace. Fig. 4 is a diagram showing the structure of a flexible vertical sonde of the present invention, and Fig. 5 is a diagram showing another embodiment of the present invention. 1... Blast furnace top 2.12. 24...Seal 3...Sonde 13.23...Flexible probe 13-1.23-1...Detection end 21... -Lance 22......Conduit exit Applicant Nippon Steel Corporation No. 1w Fig. 2 Fig. 3 (al Fig. 411 Fig. 5

Claims (2)

[Claims] (1) One or more conduits having an opening at the tip for guiding the flexible probe and lowering the flexible probe in the blast furnace are built into the hollow part, and the opening at the tip of the conduit is exposed to the outside. A buried lance comprising a rigid lance having a facing opening at the axial tip or body and extending in the radial direction of the blast furnace in a packed bed in the blast furnace, and means for feeding a flexible probe into the conduit. Included vertical sonde (2) The embedded vertical sonde according to claim 1, wherein the lance is movable in the radial direction of the blast furnace.