JPS59157208A - Method for measuring boundary of burden layer in blast furnace and probe for measurement - Google Patents

Abstract

PURPOSE:To stabilize the operation of a blast furnace by detecting the laminar state of a burden and a melting zone from changes in insertional resistances during the insertion of probes. CONSTITUTION:A driving device 48 for inserting a probe is attached to each probe body 32, and a device 44 for measuring the impellent force of the probe is attached to the device 43. The resulting probes 16, 17, 18 are inserted into a blast furnace 15 in the vertical direction and/or the peripheral direction. The boundaries of burden layers (ore layers 20, 23, 25 and coke layers 19, 21, 22) in the furnace and/or the boundary of a melting zone 2 are detected from changes in the insertional resistances, that is, change in the required impellent forces. The boundaries are measured over the whole region of the blast furnace 15, and the furnace is stably operated.

Description

[Detailed description of the invention] From (changes in required thrust), layered recognition of blast furnace contents,
The present invention relates to a method for measuring the boundary of a material layer in a blast furnace, which detects the position of the cohesive zone layer and realizes high-level stable blast furnace operation, and a measuring glove.

A blast furnace is a counterflow reactor that produces pig iron by charging iron ore and coke alternately in layers from the top of the furnace and blowing high-temperature gas from the bottom of the furnace. The iron ore charged in layers from the top of the furnace is reduced and heated as it descends due to the high-temperature reducing gas, and eventually comes to exhibit a softened and fused state. This is called a cohesive zone, and as the reaction progresses, it will eventually melt and become molten metal, which drips toward the bottom of the furnace.

The cohesive zone has extremely high ventilation resistance and therefore greatly influences the circumferential and radial distribution of gas flow in the furnace, so its position and shape are recognized as important control items in blast furnace operation. has been done. The shape of the cohesive zone is determined by the gas flow distribution in the furnace, which is determined by the cohesive zone itself, and the thickness of each layer of iron ore and coke in the layered region of iron ore that maintains its upper mass and coke (hereinafter referred to as the "lump zone"). It is governed by the distribution state of the thickness ratio (hereinafter referred to as layer thickness) in the circumferential direction and the radial direction.

Therefore, by detecting the formation state of the layer in the lumpy zone and the shape and position of the cohesive zone layer, important information for blast furnace operation can be provided.

One of the methods for measuring the layer thickness and layer thickness ratio in a massive zone is the magnetic surface thickness measurement method, which utilizes the difference in magnetic permeability and permittivity between iron ore and coke, and the electrode method, which uses the difference in magnetic permeability and permittivity between iron ore and coke. However, in principle, it is only possible to measure the upper part of the furnace and the furnace wall &13, and it is virtually impossible to measure the entire area inside the furnace.

In addition, the present inventors have published Japanese Patent Application No. 56-5990,
If the apparatus and method proposed in No. 6-578'32, Japanese Patent Application No. 56-57833, and Japanese Patent Application No. 104140 are used, it is possible to detect only the layer condition throughout the furnace, the shape and position of the cohesive zone. Although it is possible to obtain a wide variety of information such as charge particle size and gas flow in a lumpy zone, the measuring glove requires advanced manufacturing technology, maintenance and adjustment at regular intervals, and currently there are no measuring instruments available. However, it is not practical to install a large number of them vertically or circumferentially because they are expensive.

However, in order to detect the layer condition in the lumpy zone and the shape and position of the cohesive zone throughout the entire area of the lumpy zone and cohesive zone in the blast furnace, a large number of detection points are required within the practical range. Therefore, it is necessary to reduce the tidal force required for maintenance adjustment as much as possible.

The present inventors used the measuring device proposed in Japanese Patent Application No. 57-101437 and the optical measurement method proposed in Japanese Patent Application No. 56-5990. -57833, patent application No. 1983-1041.40
The measurement globe proposed in the above issue was inserted into the furnace to measure the inside of the blast furnace, and the insertion resistance of the probe was measured at the required thrust. It was found that there is a clear correspondence between the two. In addition, the insertion resistance when a glove for gas temperature and component measurement or a glove for sample sampling of charges was inserted into the furnace using the measuring device was also similar.

The present invention was made based on the knowledge that
The feature is that a method for detecting the boundary of a layer formed in a blast furnace by inserting a globe into the furnace and detecting the boundary of the in-furnace material layer and/or the cohesive zone layer boundary by the change in insertion resistance at that time. It is.

According to the present invention, a globe with a very simple structure is inserted into the furnace, and the layer thickness and layer thickness ratio in the massive zone can be measured and the cohesive zone shape position can be detected from only the change in insertion resistance (change in insertion thrust) at that time. This makes it possible to improve the precision of blast furnace operation and to enable furnace operation that can quickly and flexibly respond to changes in furnace operation conditions and pig iron splitting surfaces.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings without showing one embodiment of the present invention.

Figure 1 shows the measuring device proposed by the inventors in Japanese Patent Application No. 57-101437, which includes a device for measuring the driving force of the probe (specifically, a load ammeter for the drive motor) and a glove attachment part. A pressure detection device was installed as an insertion resistance measurement device (required thrust measurement device), and the correspondence between the furnace state detected by the optical measurement method and the glove insertion resistance (required thrust) measured at that time was not shown. The measuring device has an insertion angle of 2
5 degrees downward, 1 is iron skin.

According to the optical measurement results, as the probe 2 is inserted, it passes through the coke layer 3, then the ore layer 4, and then the coke layer 5.
, the ore layer 6 and the coke layer 7, and entered the cohesive zone 8.

At this time, the insertion resistance of the glove 2, that is, the thrust required for insertion is:
An extremely thick value of 9 is produced at the boundary between the coke layer 3 and the ore layer 4,
A minimum value of 10 occurs at the boundary between the ore layer 4 and the coke layer 5. After further similar changes occurred, short-period irregular fluctuations 11 continued from the time of entering the cohesive zone 8.

Based on this result, the present inventors further conducted several rounds of experimental studies, and found that the following modeling was sufficient, regardless of the burden particle size and the strength of the gas flow in the furnace. Reliable measurement and methods were confirmed. This point will be explained with reference to FIG.

That is, according to the present invention, 1) the region 12 where the thrust is increasing is:
It is coke layer 3. 2) The thickest point 9 of the thrust is 1)
This is the boundary between the coke layer 3 detected in , and the ore layer 4 located below. 3) The region J3 where the thrust is descending is the ore layer 4. 4) Minimum point of the thrust] 0 is the boundary between the ore layer 4 and the coke layer 5 existing below. 5) The irregular thrust fluctuation region 11 is a cohesive zone 8. Therefore, the point where the irregular fluctuation region 11 begins to appear is the outer surface 14 of the cohesive zone.
It is.

When performing measurements, the length and insertion angle of the probe to be inserted should be selected depending on the location, purpose, etc., depending on the situation. An example of this will be explained with reference to FIG.

In the upper part of the blast furnace 15, the contents layer in the furnace is inclined, and when the globe 16 is inserted horizontally, a coke layer 19, an ore layer 20, and a coke layer 21 are detected. When the globe 17 is inserted obliquely, it is possible to detect from the coke layer 22 to the ore layer 26. Furthermore, if the globe J8 is inserted diagonally, the ore layer 28 will be replaced by the coke layer 31.
up to the outer surface J4 of the cohesive zone, and the cohesive zone 8 can be detected. For example, when the main purpose is to detect the outer surface 14 of the cohesive zone, the present inventors
As shown in No. 1, No. 4.37, if the insertion angle is downward @ about 200 degrees, the outer surface of the cohesive zone] 4 can be detected with an insertion length close to the minimum.

FIG. 4 is an explanatory diagram of a glove necessary to carry out the present invention. It is necessary to take measures to transmit the insertion resistance received by the tip I4i of the glove 32 to the glove 32 as much as possible. Therefore, the flat part 3 at the tip of the glove 32
It is desirable to make 6 as large as possible. For the same reason, it is preferable that the angle θ of the glove point 35 be as close to 900 as possible. .

1. If the outer diameter of the cough glove 32 is too small, the frictional resistance between the side surface 37 of the glove 32 and the person made in the furnace increases compared to the insertion resistance experienced by the flat plate portion 36 and the point 35. Therefore, the miscellaneous component becomes large. Further, if the outer diameter of the globe 32 is too large, for example, if it exceeds the charge layer thickness, it will be impossible to distinguish. In order to avoid unnecessary enlargement of the insertion device,
The outer diameter of the probe 32 is desirably about 50 mm to 50 mm.

Since the residence time of the globe 32 in the furnace is only the time required for insertion and withdrawal, conditions such as strength and cooling can be simplified to the extent that measurement work is not hindered. When carrying out the operation in the upper part of the furnace, there is no need for water cooling, and inert gas etc. is supplied from the introduction hole 33 provided at the rear end of the globe 32, and the inside of the furnace is supplied from the small blowing hole 34 provided at the tip of the globe 32. Cooling and explosion prevention may be achieved by discharging to the When carrying out in the lower part of the furnace, the glove 3
It is also preferable that 2 has a water-cooled structure.

In addition, other than the structure described above, there is no need to impose any special restrictions on the glove, and if necessary, other measurement functions can be added to the glove to perform multiple measurements simultaneously. It is also possible to do so.

FIG. 5 shows another embodiment of the invention. When measuring the charge layer thickness and layer thickness ratio in the lumpy zone 38, the globe 41 is inserted and pulled out from the upper part of the blast furnace. insertion length,
The number of insertions in the circumferential direction and the vertical direction is determined as necessary. When the main purpose is to detect the position of the outer surface 14 of the cohesive zone, a probe 39 installed in the middle to lower part of the furnace is inserted and withdrawn. In addition, the cohesive zone position 42 on the furnace wall
When detecting, a plurality of globes 40 provided in the vertical direction are inserted sequentially or simultaneously, and the uppermost globe position where the irregular fluctuation area 11 in FIG. It's fine if you do this.

FIG. 6 shows a schematic diagram of the insertion device. It has a driving device 43 for driving the globe 32, and has an insertion resistance (required thrust) measuring device 44 for carrying out the present invention. The measuring device 4
4 may be detected by attaching a strain gauge or the like to the rear end or holding part of the glove 32, or may be installed on the drive device, etc. When using the latter, the measuring device 4
For 4-2, it is necessary to select an appropriate one depending on the type of drive source, such as using a pressure detector for hydraulic drive.

As described above, the present invention has been developed based on changes in insertion resistance (required thrust) during glove insertion.
It is possible to easily recognize and detect the coke layer and its boundaries, the cohesive zone, and the shape of the boundary between the lump zone and the cohesive zone, making it possible to make measurements over the entire blast furnace. This will greatly contribute to the high-level stable operation of blast furnaces.

[Brief explanation of the drawing]

Figure 1 shows the condition of the contents in the blast furnace and the probe insertion resistance (
Fig. 2 is an explanatory diagram of a method for detecting the state inside the furnace from the glove insertion resistance (required thrust), Fig. 3 is a schematic diagram when implementing the present invention, Fourth
The figure is an explanatory diagram of a probe, FIG. 5 is an explanatory diagram showing one embodiment of the present invention, and FIG. 6 is a schematic diagram of an insertion device. 1... Blast furnace skin 2... Glove 3, 5.
7 - Coke layer 4, 6... Ore layer 8... Fusion layer 9 Very thick point of insertion thrust 10... Minimum point of insertion thrust] 1... Irregular fluctuation region of insertion thrust 12... Region 13 where the insertion thrust is rising... Region 14 where the insertion thrust is falling... Cohesive zone outer surface 15... Blast furnace 16, 1
7.18... Probes 19, 21. , 22.24.26.29.31...Coke layer 20, 23.25.27.28.30...Ore layer 32...Globe 33...Introduction hole 34
...Blowout small hole 35...Pointed head 36...
Flat plate part 37... Glove side 38...
Massive band 39.40.41 ・Glove 42
... Furnace wall cohesive zone position 43 ... Globe drive device rod / Figure 3 times 3 / $, S mouth

Claims (1)

[Claims] 1. A blast furnace characterized by inserting a globe into the furnace and detecting the boundary between the inner layer of the inner layer and/or the boundary between the cohesive zone layers based on the change in the insertion resistance at that time. Interior content layer boundary detection method. 2. The method for detecting the boundary between layers of contents in a blast furnace according to claim 1, characterized in that a plurality of globes are inserted in the vertical direction of the blast furnace and/or in the circumferential direction of the blast furnace. A probe for measuring human layer boundaries made in a blast furnace, characterized in that a glove insertion drive device is connected to a glove body, and a probe insertion thrust measuring device is provided on the insertion drive device. 4. The probe for measuring the boundary of a layer of contents in a blast furnace according to claim 3, characterized in that a probe insertion pressure measuring device is provided in the globe holding part.