JP2001348605A - Lance for blowing synthetic resin material into vertical type metallurgical furnace and method for producing molten iron by using vertical type metallurgical furnace with attendant blowing of synthetic resin material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lance for blowing in a large quantity of synthetic resin material and a method for producing molten iron which enable the stable operation of a vertical type metallurgical furnace while blowing a large quantity of the synthetic resin material. SOLUTION: A spouting hole 6b for the synthetic resin material is arranged at the center part in a diameter direction at the tip part of the lance 1, a spouting hole 7b for oxygen or oxygen-enriched air is arranged at the outer peripheral part thereof, and a jacket for cooling fluid is arranged on the outer peripheral surface of a flow-passage for introducing the gas. Then, the axis line in the spouting direction of the synthetic resin material is constituted so as to direct to the inner part of a raceway at the front part of a tuyere without colliding against any part of the inner wall surface of a blow pipe and the inner wall surface of the tuyere, and one or more pieces of spiral partitions 8 are arranged in the introducing flow-passage for the above gas. The lance body is constituted of multi-pipes and the outer peripheral surface at the tip part of the lance projected to the front part from the outside jacket is coated with a refractory material. This lance is suitably used and the molten iron is produced while blowing powdery, granular or fine chip state synthetic resin material into the vertical type metallurgical furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical metallurgical furnace, in which a synthetic resin material is blown into the vertical metallurgical furnace as a reducing agent or the like from a tuyere using a tuyere. The present invention relates to a technique for producing hot metal by using the method.

[0002]

2. Description of the Related Art A synthetic metal material is blown into a furnace of a vertical metallurgical furnace as a reducing agent or the like by inserting a lance obliquely into a pipe wall of a blow pipe for blowing hot air into the furnace, and inserting the lance tip. A lance for blowing synthetic resin material is installed so that the part is located inside the middle part of the blow pipe in the longitudinal direction, and the synthetic resin material blown out with pneumatic gas from the tip of the lance blows the high-speed hot air inside the blow pipe. It is carried out by a method of passing through a tuyere and blowing into a furnace while joining the stream. Here, the synthetic resin material is generally subjected to a pretreatment such as pulverization or granulation as appropriate, and then blown into a furnace, for example, as a partial substitute for coke, to reduce ore in a vertical metallurgical furnace operation. It can be used as an agent and a fuel. In particular, synthetic resin materials such as used waste plastics are generally less expensive than coke, etc. and can be recycled in large quantities if reused after given pre-treatment. The use of is attracting attention.

[0003] Conventionally, there have been proposed many techniques for injecting pulverized coal from a tuyere into a blast furnace as an alternative fuel or reducing agent for coke in blast furnace operation. However, when these pulverized coal injection techniques are applied to injection of a synthetic resin material, some problems must be solved. In particular, when the amount of synthetic resin material blown into a blast furnace, etc. is increased, the synthetic resin material becomes clogged at the tip of the lance or cools at the tip of the lance even under the blowing conditions that did not occur during pulverized coal injection. Insufficiency causes thermal deformation or melting of the lance. Furthermore, the combustion behavior of the synthetic resin material when the synthetic resin material is blown into the furnace, for example, the combustion behavior of the synthetic resin material in the blast furnace raceway is different from the combustion behavior of pulverized coal.

[0004] In addition to the difference in combustion behavior between the pulverized coal and the synthetic resin material, there is also a difference in the state of pneumatic transport between the pulverized coal and the synthetic resin material until the combustion region is reached. As a result, when a synthetic resin material is blown into a vertical metallurgical furnace, it is necessary to modify the blowing method in pulverized coal blowing.

In the operation of pulverized coal injection into a blast furnace, the amount of pulverized coal injected is increased, and the combustion of pulverized coal in the raceway formed in front of the tuyere becomes incomplete, resulting in combustion in the raceway. The rate decreases, and the unburned matter is discharged into the furnace as unburned char. This unburned char has a solution loss reaction: C (unburned char) + CO ₂ = 2C
O is consumed in the furnace, but there is an upper limit to the consumption of this unburned char in the furnace. Therefore, when unburned char is generated at or above the consumption upper limit, the unburned char is discharged as a part of dust from the furnace top, causing an increase in the fuel ratio, and furthermore, the unburned char is deposited on the furnace core or molten zone. If the gas accumulates, the gas permeability and liquid permeability of the relevant part in the furnace are impaired, which causes unstable furnace conditions and reduced productivity. Regarding the technology for injecting pulverized coal into blast furnaces, as a means of solving this problem, the lance for injecting pulverized coal is multi-tube structure to improve the cooling effect and improve the contact efficiency between pulverized coal and oxygen for combustion. Many methods have been proposed for increasing efficiency.

For example, in Japanese Patent Application Laid-Open No. 1-92304, a pulverized coal blowing hole is provided at the center of a pulverized coal blowing lance inserted and mounted in a blow pipe of a blast furnace tuyere.
A lance having a water-cooled structure is disclosed in which a plurality of oxygen blowing holes are provided around the pulverized coal blowing hole, and the axis of the pulverized coal blowing hole and the axis of the oxygen blowing hole intersect in front of the lance (see FIG. 1). Hereinafter, it is referred to as prior art 1). According to the prior art, pulverized coal injected from a lance is
It is said that oxygen injected from the lance is mixed with the lance in front of the lance and burns efficiently, and pulverized coal of 200 kg or more per ton of hot metal can be blown in while maintaining operation stability.

[0007]

However, when a large amount of synthetic resin material is blown using the pulverized coal blowing lance disclosed in the prior art 1 or the like, a large amount of synthetic heat is generated by the combustion heat of the synthetic resin material. The thermal load at the tip increases, causing erosion of the lance tip and bending of the lance tip, making it difficult to stably blow in for a long time. For this reason, not only the repair cost increases due to the shortening of the lance life, but also the blowing amount of the synthetic resin material decreases, and the recycling target of the used synthetic resin material cannot be achieved.

[0008] The CO gas generated by gasification by the solution loss reaction of the unburnt char generated at the time of the above-mentioned pulverized coal injection results in direct reduction of iron ore: F
e ₃ O ₄ + 4CO = 3Fe + 4CO ₂ . However,
The amount of this reaction in the blast furnace has a limit and is determined depending on the ratio of the amount of direct reduction to the amount of indirect reduction. On the other hand, if the same amount of synthetic resin material as pulverized coal is injected instead of pulverized coal, unburned char is not discharged as part of dust from the furnace top. The rate must be greater than the pulverized coal combustion rate.

The present inventors have improved the burning rate of the synthetic resin material in the raceway over the burning rate of pulverized coal,
In order to prevent unburned char due to the synthetic resin material injected into the vertical metallurgical furnace from being exhausted together with the furnace top gas and to be wasted, a technology to blow as much synthetic resin material into the furnace as possible under such conditions is adopted. The task was to develop.

[0010] Thus, an object of the present invention is to solve the above-mentioned problems, and when performing the injection of a synthetic resin material in the operation of a vertical metallurgical furnace, a synthetic resin capable of stably blowing a large amount of synthetic resin material. It is an object of the present invention to provide a method for producing hot metal capable of stably operating a vertical metallurgical furnace with a metal injection lance and a large amount of synthetic resin material.

[0011]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies from the above-mentioned viewpoints, and have obtained the following findings. That is, the present inventors determined the relationship between the amount of unburned char generation and the amount of C consumed in the furnace by calculating the balance using a mathematical model,
Thus, in order to inject the maximum amount of the injected reducing agent and auxiliary fuel without being exhausted outside the furnace, the combustion rate in the raceway is set to 60 to 60 in the case of pulverized coal injection. While it is necessary to increase it to 70%, in the case of blowing synthetic resin material, it is necessary to increase it to about 90%. In order to increase the combustion rate of the synthetic resin material to such a value, the synthetic resin material is ejected from the radial center portion of the lance tip, and oxygen or oxygen-enriched air is appropriately ejected from the outer peripheral portion of the synthetic resin material. The conditions that promote the combustion of the lance are given, and the synthetic resin material and the high-concentration oxygen-containing fluid thus ejected from the tip of the lance are directly injected into the raceway formed in front of the tuyere, thereby forming a blowpipe. It has been found that it becomes possible by appropriately mixing the high-speed hot air flow in the inside.

The present invention has been made based on such findings, and the gist is as follows. That is, the lance for injecting a synthetic resin into the vertical metallurgical furnace according to the first aspect of the present invention is mounted by being inserted into a blow pipe attached to the tuyere of the vertical metallurgical furnace. A lance for blowing synthetic resin material and oxygen or oxygen-enriched air into the furnace. The lance is provided with a synthetic resin injection port at the radial center of the tip, and an oxygen or oxygen-enriched air injection port on the outer periphery of the synthetic resin injection port. A jacket for a cooling fluid such as cooling water is provided on the outer peripheral surface of the flow path structure for introducing the oxygen or oxygen-enriched air to the oxygen or oxygen-enriched air jet port. The axis of the synthetic resin ejection direction at the synthetic resin ejection port is
It is configured so as not to collide with any of the inner wall surface of the blow pipe and the inner wall surface of the tuyere, in a direction toward the inside of the raceway formed in front of the tuyere of the vertical metallurgical furnace, and to have its oxygen or oxygen richness. The introduction flow path of the enriched air is formed in a spiral shape whose traveling direction is directed to the flow direction of the oxygen or oxygen-enriched air, and it is configured by one or more flow paths. It has features.

According to a second aspect of the present invention, there is provided a lance for injecting a synthetic resin material into a vertical metallurgical furnace according to the first aspect of the present invention, wherein the main body of the lance is constituted by a multi-tube.
The flow path for introducing the synthetic resin material to the spout is constituted by the innermost pipe of the multi-tube, and the spout of the synthetic resin material is constituted by the tip end of the innermost pipe. The flow path for introducing oxygen or oxygen-enriched air to the jet port is a spiral partition having one or two or more annular gaps between the innermost pipe and a pipe adjacent to the outer peripheral side of the pipe. It is characterized by being constituted by a spiral flow path partitioned by a wall, and a jet port of the oxygen or oxygen-enriched air being constituted by a tip end of the spiral flow path.

According to the third aspect of the present invention, a lance for injecting a synthetic resin material into a vertical metallurgical furnace includes a first pipe from a center side,
Four pipes are provided concentrically in the order of the second pipe, the third pipe, and the fourth pipe, and a synthetic resin material is injected from a tip of the first pipe by a pneumatic gas, and the first pipe is formed. Oxygen or oxygen-enriched air is injected from the tip of the gap between the first tube and the second tube. And the gap between the second and third tubes, and the third and fourth tubes.
The cooling fluid is caused to flow in opposite directions to the gap with the pipe, and the front of the tip of the third pipe is closed, so that the cooling fluid is turned back and flows at the tip of the third pipe. ing. Further, in the gap between the first pipe and the second pipe, a spiral partition wall that partitions the gap long in the pipe length direction is provided to form a flow path for oxygen or oxygen-enriched air. It has features.

According to a fourth aspect of the present invention, in the lance for injecting a synthetic resin material into a vertical metallurgical furnace according to the third aspect of the present invention, the tip of the second tube is formed of a third and a fourth tube. It protrudes forward from the tip, and is characterized in that the outer peripheral surface of the second tube is covered with a refractory material.

According to a fifth aspect of the present invention, there is provided a method for producing hot metal by a vertical metallurgical furnace with blowing synthetic resin material, wherein the hot metal is inserted into a blow pipe attached to a tuyere of the vertical metallurgical furnace. In the method of manufacturing hot metal while blowing synthetic resin material into the vertical metallurgical furnace using the lance that has been made, the synthetic resin material is ejected from the center of the lance in the radial direction at the tip of the lance, and the injection of the synthetic resin material is performed. It is characterized in that oxygen or oxygen-enriched air is ejected from the outer peripheral portion of the outlet.

According to a sixth aspect of the present invention, there is provided a method for producing hot metal by a vertical metallurgical furnace with blowing synthetic resin material, wherein the hot metal is inserted into a blow pipe attached to a tuyere of the vertical metallurgical furnace. In the method for producing hot metal while blowing a synthetic resin material into the vertical metallurgical furnace using the lance thus formed, the lance used for blowing the synthetic resin material may be any of the lances described above. Using a lance for injecting synthetic resin into the vertical metallurgical furnace described above, the synthetic resin is ejected from the center in the radial direction of the tip of the lance, and oxygen is injected from the outer periphery of the synthetic resin ejection port. Or characterized by ejecting oxygen-enriched air and injecting at least one form of synthetic resin material selected from powder, granular, and flakes as the form of the synthetic resin material. It is.

[0018]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view showing an embodiment of a synthetic resin material blowing lance 1 according to the present invention. As shown in the figure, the main body portion of the synthetic resin material blowing lance 1 according to the present invention comprises a first pipe (2) and a second pipe (3) arranged concentrically from the center side in the lance radial direction. ), 3rd
, And four metal tubes consisting of a fourth tube (4) and a fourth tube (5).

The first pipe (2) forms a supply flow path for the synthetic resin material 6, and the synthetic resin material 6 flows from the tip of the first pipe (2) with air, nitrogen, or air. It is injected together with a pneumatic gas composed of a mixed gas with nitrogen or the like. The first tube (2)
And the gap between the second tube (3) and oxygen or oxygen-enriched air 7
And oxygen or oxygen-enriched air 7 is injected from the tip of the gap. Here, in the gap between the first pipe (2) and the second pipe (3), a spiral partition wall 8 that partitions the gap long in the pipe length direction is provided, and oxygen or oxygen-enriched air is provided. 7 are spirally formed. As a result, the oxygen or oxygen-enriched air 7 is injected as a spiral rotating flow. On the other hand, the gap between the second pipe (3) and the third pipe (4) and the gap between the third pipe (4) and the fourth pipe (5) are each provided with a cooling fluid 9 such as cooling water. The cooling fluid 9 introduced from the rear end 1a of the lance flows through the forward path to the tip 1b of the lance, turns back here, enters the return path, and is discharged from the rear end 1a of the lance. You.

The above-mentioned lance 1 for blowing synthetic resin material comprises:
As shown in FIGS. 2 and 3, it is provided and used at the tuyere of a vertical metallurgical furnace. FIG. 2 shows a blast furnace 10 as a vertical metallurgical furnace.
FIG. 3 is a view schematically showing a flow of blowing the synthetic resin material 6 into the blast furnace 10, and FIG. 3 is a view showing a mounting state of the synthetic resin material blowing lance 1 provided at the tuyere 11. FIG. 3 is a view for explaining a direction in which the synthetic resin material is ejected and a direction in which the synthetic resin material is blown into the furnace.

The tuyere 11 of the blast furnace 10 is connected to a blow pipe 13 which is a branch pipe for blowing hot air 12 from the tuyere 11 into the furnace.
Is inserted obliquely into the outer peripheral wall of the blow pipe 13, and the tip of the lance 1 is
3 and is mounted so as to be located relatively close to the tuyere 11. The axis 6z in the direction in which the synthetic resin material 6 is ejected from the ejection port 6b does not collide with any of the inner wall surface of the blow pipe 13 and the inner wall surface of the tuyere 11 on the way. It is important that the vehicle is configured so as to be directed toward the inside of the raceway 14 formed forward. Here, the spout 6b
Oxygen or oxygen-enriched air 7 is injected from the injection port 7b with respect to the flow of the synthetic resin material 6 injected from the above, and the synthetic resin material 6 becomes a mixed fluid with the oxygen or oxygen-enriched air 7 In order to allow a new flow of the synthetic resin material 6 to reach the inside of the raceway 14 as much as possible directly,
Further, it is important to appropriately increase the flow velocity of the hot air 12 injected from the blow pipe 13 so that the synthetic resin material 6 efficiently reaches the inside of the raceway 14. This makes it possible for the synthetic resin material 6 to directly reach the inside of the raceway 14 efficiently. This is because the synthetic resin material 6 efficiently and directly reaches the inside of the raceway 14, thereby improving the combustion efficiency of the synthetic resin material 6 and suppressing the combustion inside the blow pipe 13 and the inside of the tuyere 11. This is an extremely important requirement for preventing thermal damage to the device, and is one of the important components of the present invention.

Oxygen or oxygen-enriched air 7 has its jet port 7b
The axis 7z in the direction of jetting from
Intersects the axis 6z in the direction of jetting from the jet port 6b in front of the lance. Where lance 1
Since the flow path of the oxygen or oxygen-enriched air 7 in the inside is formed in a spiral shape, the flow velocity distribution of the oxygen or oxygen-enriched air 7 in the pipe circumferential direction becomes uniform, and the oxygen or oxygen-enriched air 7 Since the swirling energy is applied to the jet flow of, the degree of mixing with the synthetic resin material 6 is improved. As a result, the burning rate of the synthetic resin material 6 in the raceway 14 is further improved.

Next, in the second tube (3) and the fourth tube (5), near the tip of the lance 1, the cooling fluid 9 is folded back at the tip of the third tube (4). It is configured to be able to. For example, as shown in FIGS. 1 and 3, the outer peripheral portion near the distal end of the second pipe (3) and the distal end of the fourth pipe (5) are welded by the interposition of the flow path end surface member 15 or the like. , Formed in a folded water channel of the cooling fluid. The cooling jacket has a double-pipe water cooling structure.

In the example of FIGS. 1 and 3, the third pipe (4) is shorter than the second pipe (3) and the fourth pipe (5). The outer peripheral surface of the second tube (3) on the side is coated with a refractory material 16.
In this way, by making the tip portions of the first and second pipes project forward from the position of the folded water channel, the synthetic resin material 6 and the oxygen Alternatively, it is convenient to curve the protruding tube portion so as to direct the jet direction of the oxygen-enriched air 7.
Therefore, the degree of curvature should be appropriately selected according to the inner diameter of the blow pipe 13 and the positions of the two jet ports 6b and 7b. However, the synthetic resin material 6 injected from the injection port 6b and the oxygen or oxygen-enriched air 7 injected from the injection port 7b
A new flow of the mixed fluid with the flow of
If it is designed such that it can directly reach the inside of the raceway 14 without colliding with the inner surface of the tuyere or the inner surface of the tuyere 11, it is not always necessary to curve the protruding tube portion.

The refractory material 16 may be a castable refractory, an amorphous refractory such as mortar, or a refractory material.
A refractory woven fabric such as a ceramic fiber blanket or the like is suitable. In particular, a material that can withstand thermal shock at high temperatures is desirable. Here, the distance L from the end of the folded water channel to the end of the lance 1 is such that the cooling effect by the cooling fluid is reduced or lost, so it is important to apply a sufficient refractory material coating layer in this range. The range length at which the cooling effect is reduced is preferably, for example, about 200 mm or less.

On the other hand, on the rear end 1a side of the lance 1, an inlet 9a and an outlet 9b for the cooling fluid 9 are provided. The first and second lances 1 are provided on the rear end 1a side.
In each of the pipes, a supply port 6a for the synthetic resin material 6 and a supply port 7a for the oxygen or oxygen-enriched air 7 are provided.

Regarding the shape of the flow path of the oxygen or oxygen-enriched air 7, the range in which the spiral flow path is formed by the above-mentioned spiral partition wall 8 can sufficiently exhibit the above-described functions and effects when the spiral shape is used. It is important to be able to do so. From this viewpoint, it is particularly preferable to install the lance in the region where the heat load is large at the tip portion 1b. 50 mm from the injection port 7b
It is preferable not to set the range of the degree.

Although the embodiment shown in FIG. 1 has a single spiral partition wall 8 (one section), a plurality of partition walls 8 may be appropriately arranged along each other.

The lance 1 for injecting the synthetic resin material into the vertical metallurgical furnace described above is connected to a blow pipe 13 connected to a tuyere 11 on the lower side wall, as shown in the case of using the blast furnace 10 in FIG. 2, for example. Attach and use. In the case of a practical blast furnace, the number of tuyere 11 is usually 20 to 50 depending on the scale of the blast furnace.
The blow pipes 13 of each tuyere 11 are provided.
On the other hand, about one or two synthetic resin material blowing lances 1 can be mounted. FIG. 2 is a conceptual diagram showing an example in which one synthetic resin material blowing lance 1 according to the present invention is mounted on a blow pipe 13 of a blast furnace 10, and the detailed structure of the blast furnace equipment is omitted.

The lance for injecting the synthetic resin into the vertical metallurgical furnace according to the present invention does not need to be limited to the lance having a multi-tube structure described with reference to FIGS. Anything should do. That is, a lance that is inserted and attached to a blow pipe attached to the tuyere of a vertical metallurgical furnace, and blows a synthetic resin material and oxygen or oxygen-enriched air. Port is provided with a synthetic resin material ejection port, and the outer peripheral portion thereof is provided with an oxygen or oxygen-enriched air ejection port,
And on the outer peripheral surface of the flow path structure of oxygen or oxygen-enriched air,
A jacket for cooling fluid such as cooling water is provided, and the axial direction of the synthetic resin flow ejected from the lance does not collide with the inner wall surface of the blow pipe or the inner wall surface of the tuyere. And the flow path of oxygen or oxygen-enriched air has a form spirally swirled along the longitudinal direction of the lance. I just need. At this time, the spiral oxygen or oxygen-enriched air flow path
It is not necessary to limit the number to one, and the function is exhibited even with a plurality of lines, and there is no problem.

Since the synthetic resin material blowing lance according to the present invention has the structure as described above, the synthetic lance material is synthesized in spite of the large amount of combustion heat generated by the large amount of synthetic resin material 6 being blown. The heat load on the resin material injection lance can be reduced to prevent bending and melting of the lance tip, thereby contributing to stable furnace operation and long-term continuous operation.

Next, an embodiment of a method for producing hot metal by a vertical metallurgical furnace with synthetic resin injection according to the present invention will be described.

The above-mentioned lance for injecting the synthetic resin into the vertical metallurgical furnace according to the present invention is inserted into a blow pipe attached to the tuyere of the vertical metallurgical furnace, and is mounted. This is a method of producing molten iron having a desired composition and temperature by burning and burning a material, and performing reduction smelting of iron ore or melting and refining of scrap or the like. The feature of this hot metal manufacturing method is that firstly, a synthetic resin material is ejected from a radial center of a tip of a lance, and oxygen or oxygen-enriched air is ejected from an outer peripheral portion of the ejection port. The object is to efficiently jet and supply a synthetic resin material into a raceway formed in front of the tuyere. Thus, the present invention is intended to improve the combustion rate of the synthetic resin material in the raceway and improve the combustion efficiency of the synthetic resin material in the vertical metallurgical furnace. Therefore, as described above, the synthetic resin material blowing lance to be used need not be limited to the multi-tube structure.

Here, the vertical metallurgical furnace is a blast furnace, a scrap melting furnace or a cupola, etc., which is a furnace for producing or refining iron ore or scrap and is a vertical furnace capable of producing hot metal. The above-mentioned synthetic resin material blowing lance can be used effectively, and is suitable for this.

As described above, according to the present invention, the synthetic resin material can be efficiently used for combustion in a furnace, a reduction reaction, and the like. As long as it satisfies the following conditions, its shape is powdery, granular or flake-like, or any of the mixtures thereof. The effect is exhibited. That is, synthetic resin materials that can be used in the practice of the present invention are as follows.
Type of synthetic resin material (component system): Overall plastic product, mainly composed mainly of C, H, O Source and form of synthetic resin material: Source: Industrial waste, general waste (mainly What is discharged from homes), Form: Various, such as lump, powder, granular material, crushed pieces, strips, films, sheets, etc., which are pre-processed to a predetermined size

[0036]

EXAMPLE In a practical blast furnace, a blowing test of a synthetic resin material was performed in accordance with the embodiment shown in FIGS. The synthetic resin injection lance 1 has a length of about 2000 mm, an inner diameter of the first tube (2): 38.7 mm, and an outer diameter of the fourth tube (5): 65 mm. Woven fabric,
A water-cooled lance having a multiple pipe structure and having a thickness of about 3 mm and a coating range length (L) of about 100 mm was used. The synthetic resin material blowing lance 1 and the pulverized coal blowing lance were each inserted and attached to the blow pipe 13 of one of the 34 tuyeres. As a synthetic resin material, C, H, and O as main components, C: 50 to 90%, H: 5 to 20%, and O: 1 to 3
0% waste plastic, calorific value: 6000-1200
Various used plastics having 0 kcal / kg and a particle size of 1 to 10 mm were used. Table 1 shows operating conditions and synthetic resin material blowing conditions.

[0037]

[Table 1]

As a result of the test, the amount of synthetic resin injected per lance for injecting the synthetic resin can be increased to 200 kg in terms of one ton of hot metal, and operation troubles caused by the lance can be increased. And the stable operation of the blast furnace was able to be performed during the period from when the blast furnace was cut off to when it was cut off without discharging unburned char derived from the synthetic resin material to the outside of the furnace.

[0039]

According to the present invention, it is possible to reduce the heat load at the tip of the lance despite the heat of combustion of a large amount of synthetic resin material, and to suppress the bending and melting of the tip of the lance. As a result, extension of the lance life is achieved.
Moreover, since the burning rate of the synthetic resin material in the raceway can be significantly higher than the burning rate of pulverized coal, the fuel replacement rate due to the injection of the synthetic resin material, for example,
The coke replacement ratio in the blast furnace can be stabilized at a high level, and the operation of the vertical metallurgical furnace can be stabilized. A lance for injecting a synthetic resin material into such a vertical metallurgical furnace, and a method for producing hot metal by a vertical metallurgical furnace accompanied by injection of a synthetic resin material can be provided, and industrially useful effects can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing one example of a synthetic resin material blowing lance according to the present invention.

FIG. 2 is a schematic flowchart of a synthetic resin material blowing operation into a blast furnace according to the present invention.

FIG. 3 is a view for explaining a mounting state of a synthetic resin material blowing lance provided in the tuyere, a direction in which the synthetic resin material is ejected, and a direction in which the synthetic resin material is blown into the furnace.

[Description of Signs] 1 Synthetic resin material lance 1a Lance rear end 1b Lance tip 2 First tube 3 Second tube 4 Third tube 5 Fourth tube 6 Synthetic resin material 6a Synthetic resin material 6b Spout port (synthetic resin material) 6z Axis (synthetic resin material spouting direction) 7 Oxygen or oxygen-enriched air 7a Oxygen or oxygen-enriched air supply port 7b Spout port (oxygen or oxygen-enriched air) 7z Axis (injection direction of oxygen or oxygen-enriched air) 8 Partition wall (spiral) 9 Cooling fluid 9a Cooling fluid inlet 9b Cooling fluid outlet 10 Blast furnace 11 11 12 Hot air 13 Blow pipe 14 Raceway 15 Channel end face member 16 Refractory material 17 Furnace opening 18 Tapping hole L Distance from tip of folded water channel to tip of lance

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroshi Takeo 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. F-term (reference) 4K012 BE01 BE08 BE09 4K015 AD02 AD03 FC03

Claims (6)

[Claims] 1. A lance for injecting a synthetic resin material and oxygen or oxygen-enriched air into the vertical metallurgical furnace by being inserted into and attached to a blow pipe attached to the tuyere of the vertical metallurgical furnace. In addition, a jet port of the synthetic resin material is provided at a radially central portion of the lance tip, and a jet port of the oxygen or oxygen-enriched air is provided at an outer peripheral portion of the synthetic resin material jet port. An oxygen or oxygen-enriched air injection port is configured to form a synthetic resin material injection lance provided with a cooling fluid jacket on the outer peripheral surface of the oxygen or oxygen-enriched air introduction flow path structure, A raceway formed in front of the vertical metallurgical furnace tuyere without the injection direction axis of the synthetic resin material at the resin material spout colliding with any of the inner wall surface of the blow pipe and the tuyere inner wall surface. In the direction toward The introduction flow path for the oxygen or oxygen-enriched air is composed of one or more flow paths formed in a spiral shape whose traveling direction is oriented in the flow direction of the oxygen or oxygen-enriched air. A lance for injecting a synthetic resin material into a vertical metallurgical furnace. 2. A main body of the lance is formed of a multi-tube, and a flow passage for introducing the synthetic resin material to the synthetic resin material ejection port is formed of an innermost pipe of the multi-tube. The jet port of the synthetic resin material is formed at a tip end of the innermost installation pipe, and the introduction flow path of the oxygen or oxygen-enriched air to the jet port of the oxygen or oxygen-enriched air is An annular gap between the innermost pipe and a pipe adjacent to the outer peripheral side thereof is constituted by a spiral flow path partitioned by one or two or more spiral partition walls; 2. A lance for injecting a synthetic resin material into a vertical metallurgical furnace according to claim 1, wherein an outlet of the enriched air is formed at a tip end of the spiral flow path. 3. A first tube, a second tube, a third tube, and a fourth tube are arranged concentrically from the center side in the order of a first tube, a second tube, a third tube, and a fourth tube. The synthetic resin material is injected by the pneumatic gas, and oxygen or oxygen-enriched air is injected from the tip of the gap between the first tube and the second tube, and
Cooling fluids flow in opposite directions to the gap between the second pipe and the third pipe and the gap between the third pipe and the fourth pipe, and the tip of the third pipe. The front portion of the third tube is closed so that the cooling fluid is turned back and flows at the tip of the third tube, and further, the gap is provided between the first tube and the second tube. A lance for injecting a synthetic resin material into a vertical metallurgical furnace, wherein a spiral partition wall for partitioning the gap long in the pipe length direction is provided to form a flow path for the oxygen or oxygen-enriched air. . 4. The tip of said second tube is connected to said third and fourth tubes.
4. A synthetic resin material injection into a vertical metallurgical furnace according to claim 3, wherein said second metal tube protrudes forward from the tip of said tube, and the outer peripheral surface of said second tube is coated with a refractory material. For lance. 5. A method for producing hot metal while blowing a synthetic resin material into a vertical metallurgical furnace using a lance inserted into and attached to a blow pipe attached to a tuyere of the vertical metallurgical furnace, Injecting the synthetic resin material, wherein the synthetic resin material is ejected from a radially central portion of a tip of the lance, and oxygen or oxygen-enriched air is ejected from an outer peripheral portion of an outlet of the synthetic resin material. Of hot metal production using a vertical metallurgical furnace with 6. A method for producing hot metal while blowing a synthetic resin material into a vertical metallurgical furnace using a lance inserted into and attached to a blow pipe attached to a tuyere of the vertical metallurgical furnace, A lance for blowing the synthetic resin material into the vertical metallurgical furnace according to any one of claims 1 to 4, wherein the lance is used for blowing the synthetic resin material. The synthetic resin material is ejected from a central portion, and oxygen or oxygen-enriched air is ejected from an outer peripheral portion of an outlet of the synthetic resin material, and the form of the synthetic resin material is powder, granule, and fine particles. A method for producing hot metal by a vertical metallurgical furnace accompanied by blowing a synthetic resin material into a vertical metallurgical furnace, characterized by injecting one or more forms of synthetic resin material selected from shapes.