JPS6022304B2 - Lance for measuring the descending speed of blast furnace contents - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lance for detecting the descending speed of contents in blast furnaces.

In order to operate a blast furnace stably, it is necessary to detect the descending velocity distribution of the bags at any position in the furnace in the height direction and in the flea direction, and then adjust the amount of hot air blown to the blast furnace and the equipment based on this measured value. It is necessary to adjust the grain size distribution in the furnace of containers, the particle size distribution of bags, etc.

As a device to detect the descending velocity distribution of this blast furnace charge,
BACKGROUND ART Conventionally, for example, the surface level of the charge in the radial direction of the furnace is measured between the bell of a blast furnace and the surface of the charges in the furnace, and the descending state of the blast furnace charges has been ascertained.

However, in this method, when the charge in the blast furnace is descending, if there are places where the descending speed is different in the circumferential direction or in the direction of the blast furnace, the charge on the surface where the descending speed is slow is lower than the descending speed. Flowing onto the surface of the rapidly degrading surface, the surface furnace contents accumulated in the blast furnaces move in the circumferential direction or the furnace radial direction. There may be cases where the actual descending speed of the bagged materials that descended within that time does not match the descending speed of the bagged materials, and the accurate descending speed of the bagged materials cannot be ascertained. This method has drawbacks such as the inability to adjust bag distribution, particle size distribution, etc. of the charged material.

The present invention has been made to advantageously solve the above-mentioned drawbacks, and the gist thereof is to provide a lance that is inserted into the charge layer in blast furnaces to measure the descending speed of the charge in the blast furnace. The rear end surface is closed to make the lance body the longest tubular body that can be internally cooled, and a strain detector support village is fixedly extended in the longitudinal center of this tubular body, and the support village is fixedly extended at a predetermined interval in the longitudinal direction of the lance body. There is a lance for measuring the rate of descent of the contents in the blast furnace, which has a strain detector fixed at the strain detector and a lead wire connected to each strain detector so that the detection signal can be taken out of the furnace.

An embodiment of the present invention will be described in detail below with reference to FIG.

B in the figure is a lance, and the lance B has a lid la at the tip,
Weld a lid lb to the rear end to close each, and apply N2 to the side wall.
A gas discharge port 2 is provided, and a steel pipe with a bending stress of 4 mm is used to avoid buckling due to the thrust when inserted into the contents layer inside the blast furnace. A lance main body 1 with a flat head shape that makes it easy to move straight through the rhombus material layer, and a flat bar 3 made of willow steel plate with a wall thickness of 1 to 2 yen and fixedly held by welding A to the inner circumferential side of the lance main body 1. , resistance wire type strain detectors 4 are fixedly installed on the front and back surfaces of the flat bar 3 in the longitudinal direction.

The IJ-do wire 5 passes the detection signal from the strain detector 4 through a seal 6 provided on the rear end cover lb of the lance body 1, and then connects it to the arithmetic unit 10.
, is sent to the display 12 via the converter 11.

7 is a pipe for blowing N2 gas into the lance body 1, and N2 gas is blown from the pipe 7 to cool the inside of the lance body 1, and the ambient temperature of the strain detector 4 provided on the flat bar 3 is 200 to 300 degrees. C to prevent measurement errors caused by heat.

In order to insert this lance B into the layer of bags in the furnace and detect the descending speed of the contents in the furnace, first, the lance B was installed at the rear end of the lance body 1 in a lance drive device (not shown). After attachment via the connector 8, the lance drive device is driven, and the valve 9 is opened to blow N2 gas into the lance body 1 through the pipe 7, thereby cooling the inside of the lance body 1 and cooling the blast furnace shaft. The lance is inserted horizontally into the furnace contents layer in the radial direction of the furnace through a lance insertion hole (not shown) provided in the blast furnace wall (not shown).

Thus, when the tip of the lance body 1 reaches a predetermined position, the lance drive device is stopped, and the insertion of the lance B is stopped.
Leave it still for now. The lance B is held in the charge, and as the charge descends, the lance body 1
bends downward. According to the bending of the lance body 1, the flat bar 3 provided in the lance body 1 bends, and the amount of distortion is detected by each strain detector 4 provided on the front and back surfaces of the flat bar 3, and this detected value is A computing unit 101 provided outside the furnace is introduced via a lead wire 5.

The computing unit 10 inputs the detected values of the strain detectors 4 provided on the front and back surfaces of the flat bar 3 at the same position to the charge descending speed converter 11 in the next stage, calculates the descending speed of the bag, and displays the result. device 12
Output to. After measuring for a predetermined period of time (approximately 3 to 5 minutes), the lance drive device is operated in the lance retraction direction.
Remove lance B from the furnace.

Based on the values displayed on the display device 12, it is possible to detect the descending speed of the charge at each point where the strain detector 4 is installed and the distribution of the descending speed of the bagged material in the direction of the furnace.

In this embodiment, the strain detectors 4 are provided on the front and back surfaces of the flat bar 3 in order to improve the measurement accuracy, but the present invention is not limited to this, and even if the strain detectors 4 are provided on only one side of the flat bar 3, it is practical. Accuracy without any problems can be obtained.

In the above embodiment, the flat bar 3 was used as the strain detector support section, but other embodiments are shown in FIGS. 3 and 4.

In the figure, a round rod 3a is used as a support member for the strain detector 4, and the round rod 3a is further held at a plurality of locations in the longitudinal direction of the lance body 1 by a holding member 13 having N2 gas flow holes 14. The holding member 13 is preferably welded to the main body 1.
It is fixed in place. Therefore, by providing strain detectors 4 on the upper, lower, left, and right circumferential surfaces of the round bar 3a, even when the diamond object is descending in a direction other than the vertical direction, it is possible to measure the descending speed in that direction. . The present invention described above has a lance main body that is the longest tubular body that can be internally cooled, a strain detector support member that is fixedly extended in the longitudinal direction of this tubular body, and strain detectors that are placed at predetermined intervals in the longitudinal direction of the support member. The detectors are fixed, and lead wires are connected to each strain detector so that the detection signal can be taken out of the furnace, making it possible to accurately detect the rate of descent of the contents in the furnace with a simple configuration. Based on the results, it becomes possible to appropriately adjust the operating conditions of the blast furnace, such as the amount of hot air blowing, charging distribution of bagged materials, particle size distribution of the charging materials, etc., and it is possible to perform stable blast furnace operation over a long period of time. It has the following effects.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of a lance showing an embodiment of the present invention, Fig. 2 is a view taken along the line 1-1 in Fig. 1, and Fig. 3 is a side view of a lance showing another embodiment of the present invention. The sectional view, FIG. 4, is a view taken along the Rolo line in FIG. 3. 1: Lance body, 3: Flat bar, 3a: Round grain, 4:
Strain detector, 5: Lead wire. Multi/Crab Figure 2 Figure 3 Tsutomu Figure 4

Claims (1)

[Scope of Claims] 1. A lance that is inserted into the charge layer in blast furnaces to measure the descending speed of the charge in the furnace, and a lance that can internally cool the lance body by closing the front end and rear end faces. A flexible elongated tubular body is provided, a strain detector support member is fixedly extended in the longitudinal center of the tubular body, and strain detectors are fixed at predetermined intervals in the longitudinal direction of the support member. A lance for measuring the descending speed of contents inside blast furnaces, which is made by connecting a lead wire to a strain detector so that the detection signal can be taken out of the furnace. 2. A lance for measuring the descending speed of contents in blast furnaces according to claim 1, wherein the strain detector support member is a flat bar. 3 Claim 1 in which the strain detector support member is a round bar
A lance for measuring the descending speed of contents in blast furnaces as described in Section 1. 4. A lance for measuring the descending speed of contents in blast furnaces as set forth in claim 1, 2, or 3, wherein the tip of the lance has a flat head shape.