WO2015198689A1

WO2015198689A1 - Water-granulated-slag manufacturing device and water-granulated-slag manufacturing method

Info

Publication number: WO2015198689A1
Application number: PCT/JP2015/061341
Authority: WO
Inventors: 昌男藤田; 徹志宮田; ボブグライベルディンガー; 真司枝村
Original assignee: 株式会社Ihi; 株式会社Ｉｈｉポールワース
Priority date: 2014-06-23
Filing date: 2015-04-13
Publication date: 2015-12-30
Also published as: CN106458747A; JP2016008149A; JP5798217B1; KR101780409B1; KR20160147889A; CN106458747B

Abstract

　This water-granulated-slag manufacturing device (170) is provided with first and second water-granulated-slag manufacturing units (200A, 200B), and each of the first and second water-granulated-slag manufacturing units is provided with a water-granulated slurry generating unit (220) for injecting water into molten slag and generating a water-granulated slurry, and an Invar filter (250) for dehydrating the water-granulated slurry and manufacturing a water-granulated slag. The water-granulated-slag manufacturing device is further provided with a delivery device (400) for delivering the water-granulated slurry generated by the first water-granulated slag manufacturing unit to the Invar filter of the second water-granulated-slag manufacturing unit.

Description

Granulated slag production apparatus and granulated slag production method

The present invention relates to a granulated slag production apparatus and a granulated slag production method for producing granulated slag from molten slag discharged from a blast furnace.
This application claims priority based on Japanese Patent Application No. 2014-128325 for which it applied to Japan on June 23, 2014, and uses the content here.

The molten iron and molten slag generated in the blast furnace are discharged from the outlet. The hot metal is poured into a torpedo car through the output and sent to the downstream equipment such as a converter. On the other hand, the molten slag is diverted to the soot branched from the tuna and sent to a dry pit or a granulated slag production apparatus. In the dry pit, the molten slag is gradually cooled to produce ballast (gravel). The granulated slag production device produces pressurized granulated slag by injecting pressurized water into the molten slag and rapidly crushing it. In addition, since granulated slag has much demand compared with a ballast, molten slag is processed more by a granulated slag manufacturing apparatus than a dry pit.

As described above, in the granulated slag production apparatus, since pressurized water is injected into the molten slag, a granulated slurry that is a mixture of the granulated slag and water is generated. Therefore, the dewatering apparatus for dewatering the granulated slurry is provided in the granulated slag manufacturing apparatus. As such a dewatering device, for example, an invar filter that includes a cylindrical screen installed so that its axis is in the horizontal direction and a drive unit that rotates the screen, and dewaters the granulated slurry on the inner wall surface of the screen. (INBA filter) is used (for example, see Patent Document 1).

Further, Patent Document 2 discloses a facility for producing granulated slag, and Patent Document 3 discloses a power generation device that generates power using exhaust heat discharged from the facility for producing granulated slag.

Japanese Laid-Open Patent Publication No. 8-157241 Japanese Laid-Open Patent Publication No. 2001-180989 Japanese Unexamined Patent Publication No. 60-195309

The production capacity of the granulated slag in the granulated slag production apparatus provided with the invar filter of Patent Document 1 depends on the area of the screen of the invar filter. In general, the area (size) of the screen is determined based on the amount of molten slag delivered from one outlet. Therefore, when the spout expands at the end of the tap and the amount of molten slag to be sent increases, or when the molten slag is sent from the two taps simultaneously to one invar filter, The supply amount of the slurry may exceed the dewatering capacity of the invar filter. In this case, the delivery destination of the molten slag must be switched from the granulated slag production apparatus to the dry pit, which may reduce the production efficiency of the granulated slag.

Although it is conceivable to improve the dewatering efficiency by increasing the area of the screen constituting the invar filter, the cost required for the invar filter may increase.

It is an object of the present invention to provide a granulated slag production apparatus and a granulated slag production method capable of improving the production efficiency of granulated slag without increasing the area of the screen constituting the invar filter. To do.

In order to solve the above-described problem, in the first aspect of the present invention, the granulated slag production apparatus includes first and second granulated slag production units, and the first and second granulated slag production units include: Each includes a granulated slurry generating section that generates water granulated slurry by injecting water onto the molten slag discharged from the blast furnace body, and an invar filter that dehydrates the granulated slurry to produce the granulated slag. Moreover, the said granulated slag manufacturing apparatus sends out the granulated slurry produced | generated by the said granulated slurry production | generation part of the said 1st granulated slag production unit to the said invar filter of the said 2nd granulated slag production unit. A device is further provided.

Moreover, in the 2nd aspect of this invention, in the granulated slag manufacturing apparatus of the said 1st aspect, each of the said 1st and 2nd granulated slag manufacturing unit is the granulated which the said granulated slurry production | generation part produced | generated, respectively. A granulation tank is further provided for storing the slurry and separating water vapor from the granulated slurry. Moreover, the said delivery apparatus is comprised so that the granulated slurry in the said granulation tank of the said 1st granulated slag manufacturing unit may be sent to the said 2nd granulated slag manufacturing unit.

In the third aspect of the present invention, in the granulated slag production apparatus according to the second aspect, the delivery device includes the granulation tank and the second granulated slag production of the first granulated slag production unit. The unit is connected to the above-mentioned granulating tank.

In the fourth aspect of the present invention, in the granulated slag production apparatus according to any one of the first to third aspects, the delivery device generates the granulated slurry in the first granulated slag production unit. A delivery pipe extending from the downstream side of the section, and a pump for circulating the granulated slurry through the delivery pipe.

According to a fifth aspect of the present invention, in the granulated slag manufacturing apparatus according to the fourth aspect, the pump is provided in the delivery pipe, and the delivery apparatus is located upstream of the pump in the delivery pipe. Further provided is a shut-off valve.

In the sixth aspect of the present invention, in the granulated slag manufacturing apparatus according to the fifth aspect, the delivery device includes a buffer tank for storing the granulated slurry between the shutoff valve and the pump. Further prepare.

Moreover, in the seventh aspect of the present invention, in the granulated slag manufacturing apparatus of the first aspect, the delivery device includes first and second delivery units. The first delivery unit is configured to send the granulated slurry generated by the first granulated slag production unit to the invar filter of the second granulated slag production unit. Moreover, the said 2nd sending part is comprised so that the granulated slurry produced | generated by the said 2nd granulated slag manufacturing unit may be sent to the said invar filter of the said 1st granulated slag manufacturing unit.

Moreover, in the 8th aspect of this invention, the granulated slag manufacturing method is the granulated slag manufacturing method using the 1st, 2nd granulated slag manufacturing unit which manufactures granulated slag from the molten slag discharged | emitted from the blast furnace. In the first granulated slag production unit, a production step of injecting water into the molten slag to produce a granulated slurry, and the granulated slurry produced in the first granulated slag production unit. In the first granulated slag production unit, the first production process of dewatering and producing the granulated slag, and the above-mentioned generated in the first granulated slag production unit when a predetermined condition is satisfied Sending the granulated slurry to the second granulated slag production unit, and sending the granulated slurry from the first granulated slag production unit to the second granulated slag production unit in the delivery step The water-granulated slurry, and a second process of manufacturing a water granulated slag is dehydrated in the second granulated slag production unit.

According to the present invention, it is possible to improve the production efficiency of granulated slag without increasing the area of the screen constituting the invar filter.

It is a figure for demonstrating a blast furnace. It is a figure for demonstrating a granulated slag manufacturing unit. It is a figure for demonstrating an inba filter. It is a figure for demonstrating the delivery apparatus which comprises the granulated slag manufacturing apparatus concerning one Embodiment of this invention. It is a flowchart for demonstrating the flow of a process of the granulated slag manufacturing method concerning one Embodiment of this invention. It is a figure for demonstrating the sending apparatus concerning the modification of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

FIG. 1 is a diagram for explaining the blast furnace 100. In the present embodiment, a blast furnace 100 having a two-face cast floor will be described as an example. As shown in FIG. 1, a blast furnace 100 includes a blast furnace body 110 that generates pig iron by reducing and melting iron ore that is a metal raw material. In the blast furnace body 110, molten slag is generated together with pig iron (molten iron), and a spout 112 (indicated by reference numerals 112A to 112D in FIG. 1) for discharging the generated pig iron and molten slag is provided. 110 is provided below.

Outside the blast furnace body 110, a tapping iron 120 and a tapping iron 120 through which molten slag flowed out from the tapping port 112 are provided for each tapping port 112. In addition, a skinmer 130 is provided on the tread 120, and the pig iron and the molten slag are separated by the skinmer 130, and the pig iron passes through the tread 120 and the tilting rod 140 to a torpedo car 142 arranged under the casting floor. Led. On the other hand, the molten slag separated from the pig iron by the skinmer 130 is guided to the pole 150 branched from the tread 120 and passed through the pole 150 and the rotary pole 152 through the dry pit 160 (

reference numerals

160A and 160B in FIG. 1). Or a granulated slag production unit 200 (indicated by

reference numerals

200A and 200B in FIG. 1) constituting the granulated slag production apparatus 170. In the present embodiment, two each of the dry pit 160 and the granulated slag production unit 200 are provided, but a plurality of three or more units may be provided. That is, the granulated slag production apparatus 170 of the present embodiment includes a granulated slag production unit 200A (first granulated slag production unit) and a granulated slag production unit 200B (second granulated slag production unit). When three or more granulated slag production units are provided in the granulated slag production apparatus, at least two of the granulated slag production units may be the granulated

slag production units

200A and 200B of the present embodiment. .

In general, in the blast furnace main body 110, in order to perform the dredging while maintaining the liquid level of the pig iron and the molten slag in the blast furnace main body 110, a plurality of outlets 112 are provided in the blast furnace main body 110, and a plurality of The spout 112 is opened alternately and continuously spouted.

More specifically, as shown in FIG. 1, the blast furnace 100 having a double-faced cast floor has four tap holes 112. In this case, the dry pit 160A and the granulated slag are alternately formed by alternately changing the period for opening the tap opening 112A or the tap opening 112B and the period for opening the tap opening 112C or the tap opening 112D. The production unit 200A, the dry pit 160B and the granulated slag production unit 200B are alternately used.

As an example, during the period of opening the spout 112A or the spout 112B, while the spout 112A is opened, the

spout

112B, 112C, 112D is closed, When the output through 112A is carried out in a predetermined period and the output port 112A expands to a predetermined size (becomes the end of output), the output port 112C or the output port 112D is opened, and then the spout 112A is closed. In addition, when the tapping through the spout 112C or the spout 112D is carried out in a predetermined period and reaches the end of the spout, the spout 112A is opened, and then the spout 112C or The sealing port 112D is closed. In addition, it is called a wrap tapping to perform the tapping with both the tapping holes 112 opened. Similarly, while the spout 112B is opened, the

spouts

112A, 112C, and 112D are closed, and the spout through the spout 112B is performed during a predetermined period. At the end stage, the spout 112C or the spout 112D is opened, and then the spout 112B is closed. In addition, when the tapping through the spout 112C or the spout 112D is performed in a predetermined period and reaches the end of the spout, the spout 112B is opened, and then the spout 112C or The sealing port 112D is closed. Therefore, the molten slag extracted from the tap outlet 112A or the tap outlet 112B is introduced into the dry pit 160A or the granulated slag manufacturing unit 200A, and the dry pit 160B or water The crushed slag production unit 200 B is introduced with molten slag discharged from the tap outlet 112 C or the tap outlet 112 D.

Of the four outlets 112 described above, two outlets 112 are alternately used (one of the

outlets

112A and 112B, and the

outlets

112C and 112D. In the configuration in which one of the outlets 112 is alternately opened (so-called two-turning), one of the two outlets 112 that is not in use is repaired with respect to one outlet 112. Repair of the ridge 120), the other outlet 112 is dried and is on standby.

However, in the case of increasing the output amount, etc., a configuration (three rotations) in which the three output ports 112 of the four output ports 112 are used in order (the remaining one output port 112 is used). In some cases, repairs are performed on the heel. For example, when adopting a configuration in which the

tap outlets

112A, 112B, and 112C are used in order, a period during which the tap end of the tap outlet 112A and the initial tap output of the tap outlet 112B are wrapped (the tap outlet 112A and the tap out). There is a period during which the lap is taken out at the inlet 112B), and during this lap outlet period, both the molten slag discharged from the outlet 112A and the molten slag discharged from the outlet 112B Is introduced into the dry pit 160A or the granulated slag production unit 200A.

The dry pit 160 gradually cools the molten slag to produce ballast (gravel). The granulated slag production unit 200 produces a granulated slag by quenching and crushing the molten slag.

FIG. 2 is a diagram for explaining one granulated slag production unit 200. As shown in FIG. 2, the molten slag (shown in black in FIG. 2) falls from the ridge 150 into the granulated tub 210 and flows in. In addition, a large amount of pressurized water is sprayed from the granulated slurry generation unit (blowing box) 220 together with the inflow of molten slag into the granulated jar 210. In the granulated slag 210, the molten slag (about 1500 ° C.) is rapidly cooled to less than 100 ° C. and crushed by injecting pressurized water into the molten slag, and a granulated slurry (FIG. 5) is a mixture of the granulated slag and water. 2 are indicated by hatching). The granulated slurry thus produced is sent to the granulation tank 230.

The granulation tank 230 temporarily stores the granulated slurry and separates water vapor from the granulated slurry. The granulated slurry from which water vapor has been separated by the granulation tank 230 is introduced into the invar filter 250 by the distributor 240.

FIG. 3 is a view for explaining the invar filter 250, and is a cross-sectional view taken along line III-III in FIG. As shown in FIG. 3, the invar filter 250 is installed so that its axis is in the horizontal direction, and has a cylindrical screen 252 in which a plurality of holes are formed, and a screen 252 that rotates the screen 252 around the axis. And a drive unit. A plurality of holes 242 are provided in the lower surface of a portion of the distributor 240 that is disposed inside the screen 252, and the granulated slurry (shown by hatching in FIG. 3) is substantially contained in the screen 252 by the distributor 240. The slurry is uniformly dispersed and introduced by dropping, and the granulated slurry is dehydrated by the screen 252.

Further, the screen 252 is provided with a plurality of scraping plates 254 erected from the inner wall of the screen 252 toward the center. The scraping plates 254 are rotated in accordance with the rotation of the screen 252 (counterclockwise in FIG. 3). The granulated slag (indicated by cross hatching in FIG. 3) is scraped and dropped onto the discharge conveyor 260. Thus, the granulated slag is separated from the water of the granulated slurry and dehydrated. That is, granulated slag is produced. The granulated slag dehydrated by the inva filter 250 is discharged out of the inva filter 250 by the discharge conveyor 260 and falls from the inva filter 250 (water separated from the granulated slurry, shown in white in FIG. 3). Is stored in a water collection tank 290 provided below the inva filter 250.

Returning to FIG. 2, the granulated slag (denoted by cross hatching in FIG. 2) dehydrated by the inva filter 250 and conveyed by the discharge conveyor 260 is supplied to the product tank 280 via the transport conveyor 270. The

On the other hand, the water separated from the granulated slurry by the Inba filter 250 and stored in the water collecting tank 290 is introduced into the hot water tank 300 by overflow. Water (about 90 ° C.) introduced into the hot water tank 300 is sent to the cooling tower 320 by the hot water pump 310 and is cooled to about 50 ° C. to 60 ° C. in the cooling tower 320. The water thus cooled is circulated through the granulated slag manufacturing unit 200 by being returned to the granulated slurry generation unit 220 by the cold water pump 330.

As described above, in the granulated slag production unit 200, granulated slag is produced, and in the dry pit 160, ballast is produced. Since granulated slag is more demanding than ballast, there is a desire to introduce the entire amount of molten slag discharged from the blast furnace into the granulated slag production unit 200. However, at the end of the brewing process or during the lapping process, there are cases where the entire amount of the molten slag cannot be processed by only one granulated slag production unit 200. In this case, the delivery destination of the molten slag must be switched from the granulated slag production unit 200 to the dry pit 160, and the production efficiency of the granulated slag decreases. Therefore, in this embodiment, molten slag processing (manufacture of granulated slag) is not performed, or sending using a granulated slag production unit 200 that is in the initial stage of brewing and has a sufficient amount of granulation processing. By providing the apparatus 400 in the granulated slag production apparatus 170, the production efficiency of the granulated slag is improved. Hereinafter, the configuration of the sending device 400 will be described.

(Sending device 400)
FIG. 4 is a diagram for explaining a delivery device 400 that constitutes the granulated slag production apparatus 170. As shown in FIG. 4, the delivery device 400 includes a delivery pipe 410, a pump 420, a shut-off valve 430, and a slag control unit 440.

The delivery pipe 410 (indicated by

reference numerals

410A and 410B in FIG. 4) is a pipe that connects the granulated tank 230 of the granulated slag production unit 200A and the granulated tank 230 of the granulated slag production unit 200B. A pump 420 (indicated by reference numerals 420 A and 420 B in FIG. 4) causes the granulated slurry to flow through the delivery pipe 410. The shut-off valve 430 (indicated by

reference numerals

430A and 430B in FIG. 4) is provided on the upstream side of the pump 420 in the delivery pipe 410.

The delivery pipe 410A of the present embodiment is configured to send the granulated slurry generated by the granulated slag production unit 200A to the inva filter 250 of the granulated slag production unit 200B. Therefore, at least the delivery pipe 410A corresponds to the first delivery unit of the present invention. Further, the delivery pipe 410B of the present embodiment is configured to send the granulated slurry generated by the granulated slag production unit 200B to the inva filter 250 of the granulated slag production unit 200A. Therefore, at least the delivery pipe 410B corresponds to the second delivery unit of the present invention.

The slag control unit 440 is composed of, for example, a semiconductor integrated circuit including a CPU (Central Processing Unit), reads a program, parameters, and the like for operating the CPU itself from the ROM, and serves as a RAM and other electronic circuits as a work area. The entire delivery device 400 is managed and controlled in cooperation. In the present embodiment, the slag control unit 440 controls the pump 420 and the shutoff valve 430. Specific control processing of the pump 420 and the shutoff valve 430 by the slag control unit 440 will be described in detail later.

In the delivery device 400, for example, in the granulated slag manufacturing unit 200A, when all of the molten slag discharged from the

outlets

112A and 112B cannot be processed, the slag control unit 440 opens the shutoff valve 430A and the pump 420A. Is driven to feed the granulated slurry from the granulated tank 230 of the granulated slag production unit 200A to the granulated tank 230 of the granulated slag production unit 200B.

As a result, the molten slag that cannot be processed in the granulated slag production unit 200A can be treated in the granulated slag production unit 200B, and the granulated slag production apparatus can be used without increasing the area of the screen 252 constituting the invar filter 250. The production efficiency of the granulated slag at 170 can be improved.

Moreover, in the delivery apparatus 400, when the granulated slag manufacturing unit 200B cannot process all of the molten slag discharged from the

outlets

112C and 112D, the slag control unit 440 opens the shut-off valve 430B and the pump 420B. Is driven to feed the granulated slurry from the granulated tank 230 of the granulated slag production unit 200B to the granulated tank 230 of the granulated slag production unit 200A. Also in this case, the molten slag that cannot be processed in the granulated slag production unit 200B can be treated in the granulated slag production unit 200A, and the production efficiency of the granulated slag in the granulated slag production apparatus 170 can be improved.

(Granulated slag manufacturing method)
Then, the granulated slag manufacturing method using the said granulated slag manufacturing apparatus 170 is demonstrated. FIG. 5 is a flowchart for explaining the flow of processing of the granulated slag manufacturing method. In the present embodiment, a case where a lap is carried out at the spout 112A and the spout 112B will be described as an example. At the start of granulated slag production, the shutoff valve 430 is closed and the pump 420 is stopped.

First, the granulated slurry production unit 220 of the granulated slag production unit 200A injects pressurized water into the molten slag to produce a granulated slurry (granulated slurry production step S110, production step). Subsequently, the invar filter 250 of the granulated slag production unit 200A dehydrates the granulated slurry produced in the granulated slurry production step S110 to produce granulated slag (granulated slag production step S120, first production step). ).

Subsequently, the slag control unit 440 determines whether or not a predetermined switching condition is satisfied (determination step S130).

For example, the switching condition may be that the weight of the granulated slag transported by the transport conveyor 270 is equal to or greater than a predetermined weight set value, or the torque of the screen 252 is equal to or greater than a predetermined torque set value. Can be mentioned.

If the switching condition is not satisfied (NO in S130), the slag control unit 440 maintains the introduction of the granulated slurry from the granulation tank 230 to the inva filter 250 in the granulated slag production unit 200A, and the granulated slag production method Terminate the process. Note that the flowchart shown in FIG. 5 shows the process of determining whether or not the sending apparatus 400 of this embodiment is necessary, and therefore, for example, the process shown in FIG. Determine no.

On the other hand, when the switching condition is satisfied (YES in S130), the slag control unit 440 opens the shut-off valve 430A (valve opening step S140), drives the pump 420A (pump driving step S150), and produces granulated slag. The granulated slurry generated in the unit 200A is sent to the granulated slag manufacturing unit 200B (feeding step). Subsequently, the granulated slag production unit 200B dehydrates the granulated slurry sent from the granulated slag production unit 200A to produce a granulated slag (a granulated slag production process S160, a second production process). In addition, when the granulated slurry is produced | generated also in the granulated slag manufacturing unit 200B, the granulated slag manufacturing unit 200B is the granulated slurry sent from the granulated slag manufacturing unit 200A and the granulated slag manufacturing unit 200B. The produced granulated slurry is dehydrated together to produce granulated slag (second production step). Further, as described above, since the flowchart shown in FIG. 5 shows the process of determining whether or not the delivery device 400 is necessary, FIG. 5 always shows that the granulated slag manufacturing process S160 is performed after the granulated slag manufacturing process S120. It does not indicate that it is carried out, and in fact, these manufacturing steps may be performed simultaneously.

As explained above, by the granulated slag production method according to the present embodiment, the molten slag that cannot be treated in the granulated slag production unit 200A can be treated in the granulated slag production unit 200B, and the production efficiency of the granulated slag Can be improved.

Further, as described above, the delivery pipe 410B of the delivery device 400 is configured to send the granulated slurry generated by the granulated slag production unit 200B to the invar filter 250 of the granulated slag production unit 200A. . For this reason, the molten slag which cannot be processed in the granulated slag production unit 200B can be sent to the granulated slag production unit 200A for processing, and the production efficiency of the granulated slag can be improved. Whether or not the delivery pipe 410B is to be used may be determined in the same process as the flowchart shown in FIG.

Thus, since the delivery apparatus 400 is provided with delivery piping 410A, 410B, the delivery direction of the granulated slurry is not limited to one direction, and the delivery apparatus 400 includes a plurality of granulated slag production units (invar filters). ) Can be changed as appropriate according to the processing status of the slurry. In other words, when the processing capacity (dewatering capacity) of one granulated slag production unit 200 is insufficient among the plurality of granulated slag production units 200, the delivery device 400 is the one granulated slag production unit 200. It is comprised so that the produced | generated granulated slurry may be sent to another granulated slag manufacturing unit. Therefore, according to the processing condition of a plurality of granulated slag production units (inva filters), granulated slag can be flexibly produced.

(Modification)
FIG. 6 is a diagram for explaining a sending device 500 according to a modification of the present invention. The delivery device 500 of the modified example includes a buffer tank 510, an air discharge pipe 520, and a cleaning mechanism 530 in addition to the delivery pipe 410, the pump 420, the shutoff valve 430, and the slag control unit 440. In this modification, the buffer tank 510, the air discharge pipe 520, and the cleaning mechanism 530 disposed in the delivery pipe 410A will be described, and the buffer tank 510, the air discharge pipe 520, and the washing mechanism 530 disposed in the delivery pipe 410B will be described. Since the function is substantially the same as the said structure distribute | arranged to the delivery piping 410A, description is abbreviate | omitted.

The buffer tank 510 is provided between the shut-off valve 430A and the pump 420A, and stores the granulated slurry. The delivery pipe 410A extending from the shutoff valve 430A is connected to the upper part of the buffer tank 510, and the delivery pipe 410A extending from the pump 420A is connected to the lower part of the buffer tank 510. By storing the granulated slurry in the buffer tank 510, the air mixed in the granulated tank 230 can be separated from the granulated slurry. Further, an air discharge pipe 520 is provided on the upper surface of the buffer tank 510, and the air separated in the buffer tank 510 is discharged to the water granulation tank 230.

With the configuration including the buffer tank 510, it is possible to prevent the introduction of air that could not be separated in the water granulating tank 230 into the pump 420A. Further, it is possible to prevent the introduction of air into the pump 420A due to a decrease in the level of the granulated slurry in the granulating tank 230. As a result, the pump 420A can be stably operated.

The cleaning mechanism 530 includes a cleaning pipe 532 connected to the delivery pipe 410A between the shutoff valve 430A and the buffer tank 510, and a washing water pump 534 that supplies washing water to the delivery pipe 410A through the washing pipe 532. Composed.

The granulated slurry is not always introduced into the delivery pipe 410A, but is introduced only when the switching condition is satisfied. Therefore, there is a possibility that the granulated slurry is fixed in the delivery pipe 410A during the period when the granulated slurry is not introduced.

Therefore, the configuration including the cleaning mechanism 530 allows the water supply slurry 410A, the pump 420A, the shutoff valve 430A, and the buffer tank 510 to be cleaned with the cleaning water after the introduction of the granulated slurry into the supply piping 410A is stopped. . As a result, it is possible to prevent adhesion of the granulated slurry in the delivery pipe 410A, the pump 420A, the shutoff valve 430A, and the buffer tank 510.

The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such embodiments. A person skilled in the art can conceive various changes or modifications within the scope of the claims, and these naturally belong to the technical scope of the present invention.

For example, in the above embodiment, the example in which the delivery device 400 includes the delivery pipe 410, the pump 420, the shutoff valve 430, and the slag control unit 440 has been described. However, the delivery device has a configuration as long as the granulated slurry generated by the granulated slurry production unit 220 of one granulated slag production unit 200 can be delivered to the invar filter 250 of another granulated slag production unit 200. There is no limitation.

Moreover, in the said embodiment, the delivery piping 410 demonstrated and demonstrated the structure which connects the granulation tanks 230 as an example. However, the delivery pipe may be connected to any part (for example, the water granule 210 and the distributor 240) on the downstream side of the granulated slurry generation unit 220 and on the upstream side of the invar filter 250. For example, the delivery pipe includes any one of the granulated slag 210, the granulated tank 230, and the distributor 240 in one granulated slag production unit 200, and the granulated slag 210 and the granulated water in another granulated slag production unit 200. Any one of the tank 230 and the distributor 240 may be connected to each other.

In the above embodiment, the configuration in which the delivery device 400 includes the cutoff valve 430 has been described. However, the delivery device may not include the cutoff valve. In this case, for example, whether or not the granulated slurry is delivered is determined by driving the pump 420.

In the above-described embodiment, the blast furnace 100 having a two-face cast floor has been described. In any case, as long as a plurality of granulated slag production units 200 are provided, the delivery device 400 uses the granulated slurry produced by the granulated slurry production unit 220 of one granulated slag production unit 200 as the other. This can be sent to the INVA filter 250 of the granulated slag production unit 200, and the production efficiency of the granulated slag can be improved.

Moreover, although the granulated slag manufacturing apparatus 170 demonstrated the structure provided with the two granulated slag manufacturing units 200 in the said embodiment, the number of the granulated slag manufacturing units 200 may be three or more.

In the above-described embodiment, the configuration in which the molten slag is guided to the granulated slag manufacturing unit 200 or the dry pit 160 has been described as an example. However, instead of the dry pit 160, a ladle-type receiving device that receives a hot pot may be adopted.

In the above-described embodiment, the rotary rod 152 has been described as an example of the switching device that switches the introduction destination of the molten slag flowing through the rod 150 to the dry pit 160 or the granulated slag production unit 200. However, the switching device is not limited, and for example, a stopper for blocking the flow of the molten slag is provided on each of the dredger 150 communicating only with the dry pit 160 and the dredger 150 communicating only with the granulated slag production unit 200. Alternatively, the introduction destination of the molten slag may be switched to the dry pit 160 or the granulated slag production unit 200 by moving the stopper up and down.

Although the case where the slag control unit 440 is configured by a semiconductor integrated circuit including a CPU has been described as an example, it may be a DSC, a PLC (Programmable Logic Controller), a relay board, or the like. Moreover, the granulated slag manufacturing apparatus 170 may not include the slag control unit 440. For example, an alarm may be generated when the screen torque (torque of the drive unit) exceeds a set value, and the operator may switch the operation of the delivery device based on the occurrence of the alarm.

In the above embodiment, the delivery device 400 includes

delivery pipes

410A and 410B, but the present invention is not limited to this configuration. The delivery device is provided with one delivery pipe that connects two granulated slag production units, a pump that can change the flow direction of the granulated slurry is provided in the delivery pipe, and water between the two granulated slag production units is provided. You may comprise so that the delivery direction of crushed slurry can be changed. In this case, this one delivery pipe corresponds to both the first and second delivery parts of the present invention.

Moreover, when the processing capacity (dewatering capacity) of only a specific granulated slag production unit among a plurality of granulated slag production units is insufficient, two granulated slag production units are connected by one delivery pipe, The sending direction may be fixed in one direction. For example, in the above embodiment, when the processing capacity of only the granulated slag manufacturing unit 200A is insufficient, only the delivery pipe 410A is provided, and the delivery pipe 410B may not be provided. In addition, the delivery piping should just be a flow path | route which can make a granulated slurry flow, for example, a soot may be sufficient.

The present invention can be used in a granulated slag production apparatus and a granulated slag production method for producing granulated slag from molten slag discharged from a blast furnace.

170 Granulated slag production apparatus 200 Granulated slag production unit 200A Granulated slag production unit (first granulated slag production unit)
200B Granulated slag production unit (2nd granulated slag production unit)
220 Granulated slurry generator 230 Granulated tank 250 Inver filter 400 Sending device 410 Sending pipe 410A Sending pipe (first sending part)
410B Delivery pipe (second delivery part)
420 Pump 430 Shut-off valve 500 Delivery device 510 Buffer tank

Claims

A granulated slag production apparatus comprising first and second granulated slag production units,
Each of the first and second granulated slag production units dehydrates the granulated slurry and a granulated slurry generator that injects water into the molten slag discharged from the blast furnace body to generate a granulated slurry. An inba filter for producing granulated slag,
The granulated slag production apparatus further comprising a delivery device that sends the granulated slurry produced by the granulated slurry production unit of the first granulated slag production unit to the invar filter of the second granulated slag production unit.
Each of the first and second granulated slag production units further includes a granulation tank that stores the granulated slurry generated by the granulated slurry generation unit and separates water vapor from the granulated slurry.
The granulated slag according to claim 1, wherein the delivery device is configured to deliver the granulated slurry in the granulated tank of the first granulated slag production unit to the second granulated slag production unit. Manufacturing equipment.
The granulated slag production apparatus according to claim 2, wherein the delivery device connects the granulation tank of the first granulated slag production unit and the granulation tank of the second granulated slag production unit.
The said delivery apparatus is equipped with the delivery piping extended from the downstream of the said granulated slurry production | generation part in the said 1st granulated slag manufacturing unit, and the pump which distribute | circulates the said granulated slurry to the said delivery piping. 4. The granulated slag production apparatus according to any one of items 1 to 3.
The pump is provided in the delivery pipe,
The said delivery apparatus is a granulated slag manufacturing apparatus of Claim 4 further provided with the cutoff valve provided in the upstream of the said pump in the said delivery piping.
The granulated slag manufacturing apparatus according to claim 5, wherein the delivery device further includes a buffer tank that stores the granulated slurry between the shut-off valve and the pump.
The delivery device includes first and second delivery units,
The first delivery unit is configured to send the granulated slurry generated in the first granulated slag production unit to the invar filter of the second granulated slag production unit,
The said 2nd sending part is comprised so that the granulated slurry produced | generated by the said 2nd granulated slag manufacturing unit may be sent to the said invar filter of the said 1st granulated slag manufacturing unit. Granulated slag production equipment.
A granulated slag production method using first and second granulated slag production units for producing granulated slag from molten slag discharged from a blast furnace,
In the first granulated slag production unit, a production step of generating water granulated slurry by injecting water into the molten slag;
A first production process for producing the granulated slag by dehydrating the granulated slurry generated in the first granulated slag production unit, in the first granulated slag production unit;
A delivery step of sending the granulated slurry generated in the first granulated slag production unit to the second granulated slag production unit when a predetermined condition is satisfied;
The granulated slurry sent from the first granulated slag production unit to the second granulated slag production unit in the delivery step is dehydrated in the second granulated slag production unit to produce granulated slag. A granulated slag manufacturing method including two manufacturing steps.