CN104641002A - Pulverized coal injection device, blast furnace equipment equipped with the pulverized coal injection device, and pulverized coal supply method - Google Patents

Abstract

The running cost of blast furnace equipment is reduced to realize the reduction of the manufacturing cost of pig iron. The pulverized coal injection device (5A) is configured in such a manner that pulverized coal is injected from a tuyere (8) of a blast furnace body (2) together with heated and compressed injection air, and modified coal modified from low-quality coal and having self-heating properties is used as a raw material of the pulverized coal. Further, a heat exchanger (25a) is provided as a heat transfer means for transferring the heat generated by the self-heating action of the modified coal to a portion requiring heat. The heat exchanger (25a) heats the intake air by exchanging heat between the heat generated by the self-heating action of the reformed coal passing through the pulverized coal supply pipe (22) and the air sucked into the blown air feeder (23), for example. The modified coal may be inactivated to such an extent that a predetermined amount of the self-heating action remains.

Description

Pulverized coal injection device, blast furnace equipment equipped with the pulverized coal injection device, and pulverized coal supply method

technical field

The present invention relates to a pulverized coal injection device, a blast furnace facility equipped with the pulverized coal injection device, and a pulverized coal supply method.

Background technique

Injection of pulverized coal (PCI: Pulverized Coal Injection) as an auxiliary fuel in blast furnace equipment is a low-cost auxiliary fuel supply method that replaces heavy oil injection performed before 1970. Important conditions for pulverized coal (PCI coal) to be blown into blast furnaces include: low moisture content, low volatile content, excellent combustibility, and high combustion speed as fast as heavy oil; low combustion residues such as unburned carbon and ash ; a condition with a calorific value of 6500 kcal/kg or more; and a condition with a small content rate of a sulfur component and a phosphorus component, and the like.

In order to satisfy the above-mentioned conditions, currently, as shown in Patent Document 1, relatively high-quality and expensive raw coal such as bituminous coal is used as a raw material for PCI coal. Such raw coal is crushed to a predetermined particle size by a pulverizer to form pulverized coal, which is conveyed by an air flow of high-pressure air or nitrogen, and transported to a storage tank installed near the main body of the blast furnace for storage. Then, the pulverized coal is blown into the main body of the blast furnace together with hot air of heated high-pressure air through the tuyeres provided at the lower part of the main body of the blast furnace for combustion.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2012-173241

Contents of the invention

The problem to be solved by the invention

However, as described above, since high-quality and expensive raw coal is required as a raw material for the PCI coal blown into the blast furnace body as an auxiliary fuel, the operating cost of the blast furnace facility increases, resulting in an increase in the production cost of pig iron. .

In addition, pulverized coal is blown into the blast furnace together with compressed air, but in order to prevent the furnace from being cooled by the compressed air during the blowing, the compressed air must be heated to about 1200° C. with a burner or the like in advance. For this reason, a large amount of fuel such as heavy oil is required, which also causes an increase in the operating cost of the blast furnace facility.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pulverized coal injection device capable of reducing the operating cost of the blast furnace facility to reduce the production cost of pig iron, a blast furnace facility equipped with the pulverized coal injection device, and a pulverized coal supply. method.

Solution to the problem

In order to solve the above-mentioned problems, the present invention adopts the following means.

That is, the pulverized coal blowing device according to the first aspect of the present invention is configured to blow the pulverized coal together with the heated and compressed blown air from the tuyere of the main body of the blast furnace. Self-heating modified coal is used as the raw material of the pulverized coal.

According to this pulverized coal blowing device, as the raw material of the pulverized coal blown into the blast furnace main body as auxiliary fuel, modified coal which is much cheaper than raw coal such as bituminous coal which is generally used is used, so that the cost of auxiliary fuel can be reduced. The operating cost of blast furnace equipment can be reduced by reducing the price, so that the manufacturing cost of pig iron can be reduced.

In addition, the heat of upgraded coal can be effectively used in other parts that require heat, thereby contributing to energy saving.

The pulverized coal blowing device according to the first aspect of the present invention is based on the above-mentioned structure. Preferably, the pulverized coal blowing device is provided with a heat transfer mechanism that generates heat from the self-heating effect of the modified coal. The heat is transferred to the parts that need heat.

In the case of the above-mentioned structure, the heat generated by the self-heating action of the reformed coal is transferred to the location requiring heat by the heat transfer mechanism, so it is possible to reduce the consumption of fuel or electricity for generating heat at the location. This can reduce the operating cost of the blast furnace facility, thereby reducing the production cost of pig iron.

In addition, since the heat of the reformed coal is transferred by the heat transfer mechanism, the reformed coal is cooled, so spontaneous combustion of the reformed coal can be prevented.

The pulverized coal injection device according to the first aspect of the present invention is based on the above structure, and it is preferable that the heat transfer mechanism is configured such that the blown air before being compressed and the reformed coal exchange heat. .

According to the above configuration, the blown air is moderately heated by exchanging heat with the reformed coal before being heated by the dedicated heating means. Therefore, energy for further heating the blown air can be saved. In particular, by exchanging heat between the cold blown air before compression and the reformed coal, the cooling effect of the reformed coal is improved, and the generation rate of compression heat of the blown air is increased, thereby further reducing the heating of the blown air energy required.

The pulverized coal injection device according to the first aspect of the present invention is based on the above-mentioned structure, and it is preferable that the heat transfer mechanism transfers the heat of the reformed coal to the reforming device for reforming the low-quality coal. The method of transfer constitutes.

According to the above configuration, part of the heat required for the reformer for reforming low-quality coal is provided by the heat of the reformed coal, so energy consumed by the reformer can be saved.

The pulverized coal injection device according to the first aspect of the present invention is based on the above-mentioned structure, and preferably, the pulverized coal injection device includes an inactivation mechanism for deactivating the modified coal into its The extent to which a specified amount remains due to self-heating.

According to the above configuration, since the self-heating effect of the upgraded coal is weakened, the necessity of conveying the upgraded coal in a nitrogen atmosphere is reduced to avoid spontaneous combustion of the upgraded coal, and the usage rate of the nitrogen supply device can be reduced. Therefore, it is possible to reduce the operating cost of the blast furnace facility, thereby reducing the production cost of pig iron.

The pulverized coal blowing device according to the first aspect of the present invention is based on the above-mentioned structure, and preferably, the pulverized coal blowing device includes a mixing unit that mixes the pulverized coal composed of the modified coal and the commonly used The pulverized coal composed of raw coal is mixed, and the pulverized coal composed of the raw coal is dried by the self-heating action of the reformed coal at the mixing part and its downstream side.

In the case of the above-mentioned structure, by mixing pulverized coal composed of raw coal with a moisture content higher than that of modified coal and pulverized coal composed of modified coal, the heat of the modified coal having self-heating property , to dry the pulverized coal composed of raw coal. Therefore, the drying process of raw coal can be partially omitted or simplified. Thereby, equipment, energy, personnel, etc. related to a drying process can be reduced, and the operation cost of a blast furnace facility can be reduced, and the manufacturing cost of pig iron can be reduced.

A blast furnace facility according to a second aspect of the present invention includes a pulverized coal injection device having any one of the structures described above.

According to this blast furnace facility, cheap reformed coal is used as a raw material for the pulverized coal blown into the blast furnace body as an auxiliary fuel, so the price of the auxiliary fuel can be reduced to reduce the operating cost of the blast furnace facility, and the production cost of pig iron can be achieved. Decrease, and can effectively use the heat of self-heating of modified coal.

In addition, the pulverized coal supply method of the third aspect of the present invention is a pulverized coal supply method when the pulverized coal is blown in from the tuyeres of the main body of the blast furnace together with heated and compressed blown air. The modified modified coal is used as a raw material for the above-mentioned pulverized coal, and the heat generated by the self-heating action of the modified coal is transferred to a location requiring heat.

According to this pulverized coal supply method, since the pulverized coal blown into the inside of the blast furnace body as an auxiliary fuel becomes inexpensive reformed coal, the price of the auxiliary fuel can be lowered to reduce the production cost of pig iron. In addition, the heat generated by the self-heating action of the reformed coal can be effectively used by transferring the heat generated by the self-heating action of the reformed coal to the place where heat is needed, and the fuel or electricity consumed to generate heat at this place can be reduced, thereby reducing the operating cost of the blast furnace equipment, and further Realize the reduction of the manufacturing cost of pig iron.

In addition, the pulverized coal supply method according to the third aspect of the present invention is based on the method described above, and preferably deactivates the modified coal to such an extent that a predetermined amount of self-heating action remains.

According to the method described above, since the self-heating effect of the modified coal is weakened, the necessity of conveying the modified coal in a nitrogen atmosphere is reduced to avoid spontaneous combustion of the modified coal, and the usage rate of the nitrogen supply device can be reduced. Therefore, it is possible to reduce the operating cost of the blast furnace facility, thereby reducing the production cost of pig iron.

The pulverized coal supply method according to the fourth aspect of the present invention is a pulverized coal supply method when the pulverized coal is blown in from the tuyere of the main body of the blast furnace together with the heated and compressed blown air, wherein the low-quality coal is modified The pulverized coal composed of the final modified coal is mixed with the pulverized coal composed of raw coal that is generally used, and the pulverized coal composed of the raw coal is dried by the self-heating action of the modified coal.

According to the above pulverized coal supply method, by mixing pulverized coal composed of raw coal having a moisture content higher than that of modified coal and pulverized coal composed of modified coal, the heat generated by the self-heating modified coal is used to generate Since the pulverized coal composed of raw coal is dried, part of the drying process of raw coal can be omitted or simplified. Thereby, equipment, energy, personnel, etc. related to a drying process can be reduced, and the operation cost of a blast furnace facility can be reduced, and the manufacturing cost of pig iron can be reduced.

Invention effect

As described above, according to the pulverized-coal injection device, the blast furnace facility including the pulverized-coal injection device, and the pulverized-coal supply method of the present invention, it is possible to reduce the operating cost of the blast furnace facility and reduce the production cost of pig iron.

Description of drawings

Fig. 1 is a schematic configuration diagram of a blast furnace facility equipped with a pulverized coal injection device according to a first embodiment of the present invention.

Fig. 2 is a schematic configuration diagram of a blast furnace facility equipped with a pulverized coal injection device according to a second embodiment of the present invention.

Fig. 3 is a schematic configuration diagram of a blast furnace facility equipped with a pulverized coal injection device according to a third embodiment of the present invention.

Fig. 4 is a schematic configuration diagram of a blast furnace facility equipped with a pulverized coal injection device according to a fourth embodiment of the present invention.

Fig. 5 is a schematic configuration diagram of a blast furnace facility equipped with a pulverized coal injection device according to a fifth embodiment of the present invention.

Detailed ways

Hereinafter, several embodiments of the present invention will be described based on FIGS. 1 to 5 .

[first embodiment]

Fig. 1 is a schematic configuration diagram of a blast furnace facility 1A provided with a pulverized coal injection device 5A according to a first embodiment of the present invention. This blast furnace facility 1A includes a blast furnace main body 2 , a raw material quantitative supply device 3 , a loading conveyance device 4 , and a pulverized coal injection device 5A.

The blast furnace main body 2 has a general structure, and a top hopper 7 is provided at the top thereof, and a tuyere 8 and a pig iron outlet 9 are provided at the lower part. The blowpipe 11 is connected to the tuyere 8 , and the spray gun 12 is connected to the blowpipe 11 in such a way that it merges obliquely to the blowpipe 11 .

The loading and conveying equipment 4 is arranged to rise from the vicinity of the base of the blast furnace main body 2 toward the furnace top hopper 7, and the downstream end (upper end) of the loading and conveying equipment 4 is located directly above the furnace top hopper 7 in the conveying direction. A raw material quantitative supply device 3 is provided directly above the upstream end (lower end).

The raw material quantitative supply device 3 transports raw materials such as iron ore as the main raw material of pig iron 14 smelted in the blast furnace main body 2, coke as a fuel and reducing material, and limestone as a material for removing impurities to the charge at a constant supply speed. The equipment 4 supplies, and the above-mentioned raw materials are loaded into the blast furnace main body 2 from the furnace top hopper 7 through the loading conveying equipment 4, and the smelted pig iron 14 is accumulated at the bottom of the blast furnace main body 2. The pig iron 14 after smelting is taken out from pig iron outlet 9.

On the other hand, the pulverized coal blowing device 5A blows pulverized coal (PCI coal) as an auxiliary fuel together with heated and compressed hot blast-like blown air from the tuyere 8 (blowpipe 11) of the blast furnace main body 2, so that The temperature inside the blast furnace main body 2 rises. This pulverized coal injection device 5A includes a reformer 16, a charging line 17, a nitrogen gas supply device 18, a cyclone separator 19, a storage tank 21, a pulverized coal supply pipe 22, an air blowing device 23, and the like.

The reforming device 16 and the cyclone separator 19 are connected by a charging line 17 , and a nitrogen gas feeding device 18 is connected upstream of the charging line 17 . In addition, the pulverized coal supply pipe 22 is connected between the storage tank 21 and the spray gun 12 . Then, the blown air in the form of hot air generated by the blown air supply device 23 is supplied to the blowpipe 11 .

Since the structure of the modifying device 16 is well known, its detailed description is omitted, but in brief, the modifying device 16 is a device that modifies the properties of low-quality coal such as cheap sub-bituminous coal or lignite to a suitable It is pulverized to produce pulverized coal (PCI coal) as an auxiliary fuel for the blast furnace main body 2 . In this reformer 16, the low-quality coal fed from the receiving hopper 24 is dried and heated multiple times to remove moisture and volatile components, then cooled, and pulverized by a mill to become pulverized coal for auxiliary fuel.

The blown air supply device 23 is a device that compresses the air sucked in from the air suction pipe 25 by a compressor not shown, and heats the air to about 1200° C. by a heater or a burner not shown. , thereby generating high-temperature, high-pressure and dried blown air for pulverized coal blowing.

The middle part of the air suction pipe 25 is formed, for example, in a spiral shape that wraps multiple turns around the pulverized coal supply pipe 22, and this spiral part serves as a heat exchanger 25a. This heat exchanger 25a functions as a heat transfer mechanism that transfers the heat generated by the self-heating action of reformed coal passing through the inside of the pulverized coal supply pipe 22 to a location requiring heat, for example, in this embodiment. Blowing air is sent to the device 23 for transfer.

In the pulverized coal blowing device 5A constituted as above, the pulverized coal composed of the reformed coal obtained by reforming the low-quality coal through the reformer 16 is conveyed to the charging line 17, and is sent from the nitrogen gas feeding device 18. Nitrogen gas is mixed to form a solid-gas two-phase flow, which is sent to the cyclone separator 19 in an inert atmosphere of nitrogen gas. The cyclone separator 19 is a type of centrifugal separation device, and separates and degasses nitrogen gas from pulverized coal by centrifugal force, and releases or recovers nitrogen gas to the outside. Thereafter, the pulverized coal is stored in the storage tank 21 , and only a necessary amount is supplied from the pulverized coal supply pipe 22 to the spray gun 12 .

On the other hand, when the air (external air) sucked from the air suction pipe 25 and supplied to the blown air delivery device 23 passes through the heat exchanger 25a formed in the middle of the air suction pipe 25, it is connected with the air in the pulverized coal supply pipe 22. The heat generated by the self-heating effect of the pulverized coal composed of modified coal that descends at a relatively slow speed in the interior is exchanged for heat, so that the temperature rises, and the heat is carried and supplied to the blowing air supply device 23. The air is further compressed and heated in the air supply device 23 to become high-temperature and high-pressure hot air at about 1200°C. That is, the blown air exchanges heat with the reformed coal before being compressed and heated by the blown air supply device 23 .

Then, the pulverized coal (modified coal) supplied to the spray gun 12 is mixed with the blown air supplied to the blowpipe 11, and the pulverized coal is ignited and combusted in contact with the high-temperature hot air blown air, and becomes A flame is formed to form a combustion raceway, and coke charged into the blast furnace main body 2 is combusted. Thereby, the iron ore charged together with the coke is reduced to become pig iron (liquid iron) 14 , which is taken out from the pig iron outlet 9 .

The pulverized coal blowing device 5A configured as above uses pulverized coal composed of self-heating self-heating reformed coal as a tuyere from the blast furnace main body 2 together with the heated and compressed blown air. 8 Blown in pulverized coal. Since reformed coal is much cheaper than raw coal such as bituminous coal that is generally used, the price of auxiliary fuel can be reduced to reduce the operating cost of the blast furnace facility 1A, thereby reducing the production cost of pig iron. In addition, the heat of upgraded coal can be effectively used in other parts that require heat, thereby contributing to energy saving.

In addition, in this embodiment, as an example of the heat transfer mechanism that transfers the heat generated by the self-heating action of the pulverized coal generated from the reformed coal to other parts that require heat, the blown air supply device 23 inhales The middle part of the air suction pipe 25 through which the air passes is provided with a heat exchanger 25a, and the heat of the air passing through the inside of the heat exchanger 25a and the heat of the pulverized coal passing through the inside of the pulverized coal supply pipe 22 are exchanged. Therefore, the blown air is moderately heated by exchanging heat with the pulverized coal before blowing it in.

Therefore, energy such as fuel and electric power consumed to further heat the blown air in the blown air feeding device 23 can be greatly saved, and the operating cost of the blast furnace facility 1A can be further reduced to contribute to the reduction of the production cost of pig iron. In addition, since the heat of the reformed coal passing through the pulverized coal supply pipe 22 is transferred by the heat exchanger 25a to cool the reformed coal, spontaneous combustion of the reformed coal can be prevented.

In particular, the cold blown air before being compressed by the blown air delivery device 23 is heat-exchanged with the reformed coal, so the cooling effect of the reformed coal in the pulverized coal supply pipe 22 can be improved, and the blown air can be improved. The generation rate of compression heat, and the energy for heating the blown air is further reduced.

[Second Embodiment]

Fig. 2 is a schematic configuration diagram of a blast furnace facility 1B provided with a pulverized coal injection device 5B according to a second embodiment of the present invention.

This pulverized coal injection device 5B differs from the pulverized coal injection device 5A of the first embodiment (FIG. 1) in that it includes a heat transfer pipe 32 (heat transfer mechanism) extending from the reformer 16, The heat transfer pipe 32 is arranged so as to loop around the pulverized coal supply pipe 22 multiple times and return to the reforming device 16 again. The surrounding portion of the heat transfer pipe 32 is the same heat exchanger 32a as the heat exchanger 25a of the pulverized coal injection device 5A of the first embodiment. A fluid serving as a heat medium circulates inside the heat transfer pipe 32 . The configuration of other parts is the same as that of the pulverized-coal injection device 5A of the first embodiment, and therefore the same reference numerals are assigned to the respective parts, and description thereof will be omitted.

The heat generated by the self-heating action of reformed coal passing through the pulverized coal supply pipe 22 is transferred to the reformer 16 by the heat medium flowing through the heat transfer pipe 32 and the heat exchanger 32 a. In the reformer 16, this heat is used, for example, in a step of drying low-quality coal. Thereby, the energy consumed for drying low-quality coal can be saved.

[Third Embodiment]

Fig. 3 is a schematic configuration diagram of a blast furnace facility 1C including a pulverized coal injection device 5C according to a third embodiment of the present invention.

In this pulverized coal blowing device 5C, the only difference from the pulverized coal blowing device 5A of the first embodiment (FIG. Activation mechanism), and the structure of other parts is the same as that of the pulverized coal injection device 5A, so the same symbols are attached to each part and descriptions are omitted.

In the deactivation unit 42 , the reformed coal reformed by the reformer 16 from low-quality coal is deactivated to such an extent that a predetermined amount of self-heating action remains. As a specific deactivation method, the coal that has been carbonized at 300° C. to 500° C. in the reformer 16 and then cooled is exposed to a treatment gas atmosphere containing oxygen in the deactivation device 42 to transfer oxygen to the gas. Surface and internal adsorption (soaking) treatment. By adjusting the amount of oxygen absorbed, the degree of self-heating of the modified coal can be adjusted.

In this embodiment, the degree of treatment in the deactivation device 42 is set to preserve a certain degree of self-heating effect for the upgraded coal sent to the charging line 17 after finishing the deactivation treatment by the deactivation device 42. degree.

By providing such an inactivation device 42, the self-heating effect of the reformed coal can be weakened, so the necessity of transporting the reformed coal in a nitrogen atmosphere to avoid spontaneous combustion can be eliminated, or the amount of nitrogen gas used can be reduced. Therefore, it is possible to reduce the decrease in the operating rate of the nitrogen gas feeding device 18, reduce the operating cost of the blast furnace facility 1C, and further reduce the production cost of pig iron.

[Fourth Embodiment]

Fig. 4 is a schematic configuration diagram of a blast furnace facility 1D including a pulverized coal injection device 5D according to a fourth embodiment of the present invention.

In this pulverized coal blowing device 5D, the point of difference from the pulverized coal blowing device 5A of the first embodiment (FIG. 1) is that in the pulverized coal blowing device 5A, only the The pulverized coal composed of modified coal is supplied to the blast furnace main body 2. On the other hand, in the pulverized coal injection device 5D, the pulverized coal composed of modified coal and the pulverized coal composed of raw coal generally used are mixed and supplied to the blast furnace. Subject 2 supplies.

The pulverized coal injection device 5D includes two cyclones 19A, 19B, and a mixing pipe 52 (mixing section) is provided downstream of the cyclones 19A, 19B, and the mixing pipe 52 is connected to the storage tank 21 . Since the structure of other parts is the same as 5A of pulverized-coal injection apparatuses, the same code|symbol is attached|subjected to each part, and description is abbreviate|omitted.

In this pulverized coal injection device 5D, pulverized coal composed of reformed coal reformed by the reformer 16 is supplied from the charging line 17 to the cyclone 19A. In addition, pulverized coal made of raw coal is supplied to the cyclone 19B through a supply device not shown. Then, the two types of pulverized coal are mixed in the mixing pipe 52 and stored in the storage tank 21 . Then, the two kinds of pulverized coal are supplied to the blast furnace main body 2 in a mixed state together with hot air blown air supplied from the blown air supply device 23 via the pulverized coal supply pipe 22 .

In the above structure, since the pulverized coal composed of upgraded coal and the pulverized coal composed of raw coal are mixed in the mixing pipe 52, in the mixing pipe 52 and the storage tank 21 and the pulverized coal supply pipe 22 on the downstream side, the The self-heating action of the pulverized coal composed of modified coal dries the moisture contained in the pulverized coal composed of raw coal.

Therefore, it is possible to omit a part or simplify the drying process of the pulverized coal made of raw coal or the raw coal itself. Thereby, equipment, energy, personnel, etc. related to the drying process of raw coal can be reduced, and the operation cost of blast furnace facility 1D can be reduced, and the manufacturing cost of pig iron can be reduced.

[Fifth Embodiment]

Fig. 5 is a schematic configuration diagram of a blast furnace facility 1E provided with a pulverized coal injection device 5E according to a fifth embodiment of the present invention.

This pulverized coal injection device 5E is equipped with the deactivation device 42 provided in the pulverized coal injection device 5C of the third embodiment ( FIG. 3 ) in the pulverized coal injection device 5D of the fourth embodiment ( FIG. 4 ). Structure. The deactivation device 42 deactivates the reformed coal obtained by reforming the low-quality coal by the reformer 16 to such an extent that a predetermined amount of self-heating action remains. The structure of other parts is the same as that of the pulverized coal blowing device 5D.

When the modified coal is completely deactivated, it loses self-heating property, so in the deactivation device 42, the modified coal is prevented from being completely deactivated. Before the pulverized coal is supplied from the mixing pipe 52 to the blast furnace main body 2 through the pulverized coal supply pipe 22, the moisture contained in the pulverized coal composed of raw coal is dried by self-heating of the pulverized coal composed of upgraded coal.

According to this pulverized coal injection device 5E, the drying process of the raw coal can be partially omitted or simplified, and the equipment, energy, and personnel related to the drying process of the raw coal can be reduced, and the operating cost of the blast furnace equipment 1E can be reduced. Manufacturing costs are reduced.

In addition, since the self-heating effect of the upgraded coal can be weakened by the deactivation device 42, the necessity of transporting the upgraded coal in a nitrogen atmosphere to avoid spontaneous combustion of the upgraded coal can be eliminated, or the amount of nitrogen gas used can be reduced. Therefore, the operating rate of the nitrogen gas feeding device 18 can be reduced, and this can also reduce the operating cost of the blast furnace facility 1E, thereby contributing to the reduction of the production cost of pig iron.

As described above, according to the pulverized coal injection devices 5A to 5E and the pulverized coal injection method of each of the above-mentioned embodiments, it is possible to reduce the operating cost of the blast furnace facilities 1A to 1E and reduce the production cost of pig iron.

The present invention is not limited to the configurations of the above-mentioned embodiments, and changes or improvements can be appropriately added without departing from the gist of the present invention. Embodiments with such changes or improvements are also included in the scope of rights of the present invention.

For example, the destination of transferring the heat generated by the self-heating property of reformed coal does not have to be the inside of the blast furnace facility, and the heat may be transferred to adjacent plants or other facilities. In addition, the configurations of the respective embodiments may be combined appropriately.

Symbol Description:

1A, 1B, 1C, 1D, 1E blast furnace equipment

2 blast furnace body

3 Raw material quantitative supply device

4 Loading into the conveying equipment

5A, 5B, 5C, 5D, 5E Pulverized coal injection device

7 Furnace top hopper

8 outlets

9 pig iron export

11 Blowpipe

12 spray guns

14 pig iron

16 Modification device

17 load line

18 Nitrogen delivery device

19, 19A, 19B cyclone separator

21 storage boxes

22 Pulverized coal supply pipe

23 Blowing air into the device

24 Accept Hopper

25 air suction pipe

25a heat exchanger (heat transfer mechanism)

32 hot transfer tube (hot transfer mechanism)

32a heat exchanger (heat transfer mechanism)

42 Inactivation device (inactivation mechanism)

52 Mixing tube (mixing part)

Claims (10)

1. a coal dust device for blowing, it is to be formed coal dust with the mode be blown into from the air port of high furnace main body together with air that is blown into after being heated and compress, wherein,

Use, from low-quality coal modification, there is the raw material of spontaneous hot modified coal as described coal dust.

2. coal dust device for blowing according to claim 1, wherein,

Described coal dust device for blowing is provided with hot transfer mechanism, and the heat that the spontaneous heating effect of described modified coal produces by this hot transfer mechanism is transferred to needing the position of heat.

3. coal dust device for blowing according to claim 2, wherein,

Described hot transfer mechanism is formed to make the mode by being blown into air and described modified coal described in before compressing and carrying out heat exchange.

4. coal dust device for blowing according to claim 2, wherein,

Described hot transfer mechanism is to be formed the mode of the heat of described modified coal to the reforming apparatus transfer described low-quality coal being carried out to modification.

5. coal dust device for blowing according to any one of claim 1 to 4, wherein,

Described coal dust device for blowing possesses deactivation mechanism, and this deactivation mechanism changes into nonactive for described modified coal the degree that its spontaneous heating effect remains specified amount.

6. coal dust device for blowing according to claim 1, wherein,

Described coal dust device for blowing possesses mixing unit, this mixing unit is by the coal dust be made up of described modified coal and the normally used coal dust mixing be made up of raw coal, in this mixing unit and downstream side thereof, made the coal dust drying be made up of described raw coal by the spontaneous heating effect of described modified coal.

7. a blast-furnace equipment, it possesses the coal dust device for blowing according to any one of claim 1 to 6.

8. a coal dust supply method, it is by coal dust and the coal dust supply method be blown into when being blown into from the air port of high furnace main body together with air after being heated and compress, wherein,

Use and carry out the raw material of modified modified coal as described coal dust to low-quality coal, the heat spontaneous heating effect of this modified coal produced utilizes to needing the position of heat to transfer.

9. coal dust supply method according to claim 7, wherein,

The degree that its spontaneous heating effect remains specified amount is changed into by nonactive for described modified coal.

10. a coal dust supply method, it is by coal dust and the coal dust supply method be blown into when being blown into from the air port of high furnace main body together with air after being heated and compress, wherein,

Low-quality coal will be carried out to coal dust that modified modified coal forms and the normally used coal dust mixing be made up of raw coal,

By the spontaneous heating effect of described modified coal, make the coal dust drying be made up of described raw coal.