JP2796272B2 - Molten metal transport system and molten metal transport equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten metal transport system and a molten metal transport system for transporting molten metal such as steel.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 50-49105 discloses a method for transferring hot metal from a blast furnace to a steelmaking plant in an integrated steelmaking steel mill called a blast furnace-converter method. As described in the official gazette, a method using a torpedo car (mixed iron wheel) as shown in FIG. 5 and a method using an open ladle (blast furnace pot) as shown in FIG. 6 are known. Hot metal from the blast furnace is conveyed to a converter by a torpedo car 32 or an open ladle 33 pulled by a locomotive 31 on a track laid between the blast furnace and a steelmaking plant. The conventional hot metal transport system will be further described with reference to FIGS. 5 and 6. In the system shown in FIG. 5, hot metal poured from a blast furnace 34 is sequentially poured into a torpedo car 32 lined up on a line below a casting bed at a taphole. After the pig iron, the torpedo car 32 is pulled by the locomotive 31 and transferred to the raw material building 35 of the steel mill, where the torpedo car 3
2 is temporarily stored in the mixed iron furnace 36. After the hot metal in the mixed iron furnace 36 is transferred to the hot metal charging pot 37, the hot metal charging pot 37 is transferred to the converter 39 by the crane 38, and
Hot metal is injected into 9. In the method shown in FIG. 6, similarly to FIG. 5, hot metal poured from the blast furnace 34 is poured into the open ladle 33, and the bogie 40 on which the open ladle 33 is placed is pulled by the locomotive 31 to make a steelmaking plant. Is transferred to the raw material building 35, and the open ladle 33 is moved to the crane 4
The hot metal suspended in the open ladle 33 is temporarily stored in the mixed-iron furnace 36. After the hot metal in the mixed iron furnace 36 is transferred to the hot metal charging pot 37, the hot metal charging pot 37 is transferred to the converter 39 by the crane 38, and the converter 39
Hot metal is injected into the inside.

As described above, in the conventional hot metal transfer system, the transfer distance from the blast furnace to the converter is long, and the number of hot metal transfers is large. This leads to an increase in both initial and running costs of the dust collecting device as an auxiliary equipment for the optimization of the operation.

The total length of a large-capacity torpedo car is 3
Since it reaches 0 to 35 m, the proper radius of curvature of the track in a connected running state with a locomotive pulling a plurality of torpedo cars needs to be 140 to 150 m, and as a result, the plant site needs to be extremely large.

[0005] The weight of the hot metal charged into the converter is measured for each carriage on which an open ladle is mounted in front of the converter.
Or, since it is a track scale system in which measurement is performed for each torpedo car, the accuracy is lower than that of ladle weighing.

Incidentally, the hot metal weight required in a converter generally varies depending on the operation schedule and the required steel type. In this regard, in recent years, particularly, the amount of hot metal filled in a torpedo car, which has tended to increase in capacity in search of economies of scale, does not correspond one-to-one to the charging amount required by the converter. In order to adjust to the required charge, it is necessary to pour the hot metal into the hot pot several times,
In the steelmaking plant, the required charging amount was satisfied again by a hot metal weighing device with a weighing function more accurate than a truck scale and relay dring, and it was designed to have a shape and capacity that can be charged into the converter furnace mouth. Hot metal charging pot is required. Furthermore, in recent years, when hot metal pretreatment such as desulfurization, dephosphorization, and silicon removal is performed in accordance with the improvement in required steel quality, the torpedo car has a vertically long shape, so the gas and pretreatment agent for hot metal pretreatment by the immersion type injection lance are used. There is a drawback that sufficient stirring of the hot metal cannot be performed due to insufficient stirring in the inside, and a drawback that slag scraping cannot be sufficiently performed.

As described in detail above, the conventional hot metal transport system has various disadvantages. Therefore, as an open ladle-type hot metal transfer system for improving these drawbacks, Japanese Patent Laid-Open No. 50-49105 discloses a pit 42 connecting a blast furnace 34 and a raw material building 35 of a steelmaking plant as shown in FIG. The hot metal charging pot 37 is placed on a weighing machine 43 running on a rail laid in the pit 42, and the hot metal is poured from the blast furnace 34 into the mixed iron furnace 36a or 36b. After moving the dolly 43 to the raw material building 35 of the steelmaking factory through the pit 42, the crane 3
8 describes a method for transporting the hot metal charging pot 37 to the converter 39. However, in this method, since the mixed iron furnace 36a or 36b is interposed between the blast furnace 34 and the converter 39 in addition to the hot metal charging pot 37 which is a hot metal transfer vessel, the “hot metal” accompanying the transfer of hot metal is still required. The problem of "temperature drop" and the problem of "dust generation" are not so improved.
Further, when a trouble occurs in the tap hole of the blast furnace 34, the hot metal charging pot 37 cannot receive the hot metal of a predetermined weight, and similarly to the conventional hot metal conveying method of FIGS. 5 and 6,
Since a single hot metal charging pot 37 cannot be filled with the required hot metal charging amount of the converter 39, another hot metal charging pot will replenish the insufficient hot metal. As described above, if a single hot metal charging pot cannot secure the required amount of hot metal to be charged into the converter, as described above, excess hot metal not charged into the converter will remain in the hot metal charging pot. However, the temperature of the residual hot metal drops significantly before being charged into the converter, which hinders the operation in the steelmaking plant.

As described above, when the conventional hot metal transfer system is adopted, there are various disadvantages in the torpedo car system and the open ladle type hot metal transfer system. The open ladle has a substantially cylindrical shape, which is advantageous in terms of hot metal pretreatment. In addition, it can be used as both an open ladle (blast furnace pan) and a chargeon grader (hot metal charging pan), and can receive iron from the blast furnace to the open ladle. By weighing the required amount of hot metal in the converter during the process and associating the receiving volume with the required amount of converter in a one-to-one relationship, it is possible to take advantage of the advantage of the open ladle as a hot metal carrier. It becomes possible.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to use an open ladle as a transfer vessel for molten metal in a steelmaking furnace charging pan. It is an object of the present invention to provide a novel molten metal transport system and a molten metal transport facility made possible by weighing directly below a pig iron furnace. Specifically, an object of the present invention is to provide a molten metal transport system and a molten metal transport facility capable of transporting within a limited layout shape site. It is another object of the present invention to provide a molten metal transport system and a molten metal transport facility that reduce heat loss during transport. Another object of the present invention is to provide a molten metal transport system and a molten metal transport facility that minimize the frequency of dust generation due to molten iron injection.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a metal melting furnace and a metal melting furnace which can supply a required amount of hot metal to a steelmaking furnace from a metal melting furnace without excess or shortage. Provide a transport path that connects the steelmaking plant with the optimal access route according to the layout, inject the required amount of molten iron in the steelmaking furnace from the metal melting furnace into the open ladle and melt the molten metal along the transport path. Is a very efficient molten metal transport system and a molten metal transport facility capable of transporting molten metal.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the molten metal transport system of the present invention, a molten metal discharged from a metal melting furnace is mounted on a self-propelled bogie having a weight measuring means only in an amount required in a steelmaking furnace. After the self-propelled bogie is run on a first track laid immediately below or near the metal melting furnace, the open ladle is transferred to another self-propelled bogie, and The traveling trolley is moved on the second track connecting the metal melting furnace and the steelmaking plant and moved into the steelmaking plant,
Next, after passing through the hot metal pretreatment and / or slag scraping treatment, in any case, the molten metal is directly charged into the furnace opening without adjusting the charging amount by adding or transferring molten metal. It is characterized by: It is preferable to have a plurality of first tracks on which the above-described self-propelled truck travels, and a crane at the upper portion of the first track which can transfer an open ladle to an arbitrary self-propelled truck.

Further, the molten metal transport equipment of the present invention has a plurality of first tracks on which a self-propelled bogie having weight measuring means and carrying an open ladle travels is laid immediately below or near a metal melting furnace, A crane capable of transferring an open ladle is installed on the upper part of the first track, and a plurality of second self-propelled trucks that travel in the direction orthogonal to the first track or in the same direction following the first track A track is laid to connect the metal melting furnace to the steelmaking plant, and the steelmaking plant is equipped with molten metal charging equipment for charging the molten metal in the open ladle into the furnace opening of the steelmaking furnace. In the present invention, the metal melting furnace refers to a hot metal production facility such as a blast furnace or a smelting reduction furnace. Further, the steelmaking furnace refers to a batch type refining furnace such as a converter or an electric furnace.

[0013]

Next, an embodiment in which the present invention is applied to equipment for transferring hot metal from a blast furnace to a converter will be described with reference to the drawings. FIG. 1 shows the overall arrangement of the hot metal transfer facility. In FIG. 1, 1 is a first blast furnace, 2 is a second blast furnace, 3 is a main gutter, and 4 is a tilting gutter. Hot metal in the first blast furnace or the second blast furnace flows from one of the main gutters 3 through the inclined gutter 4,
It is poured into an open ladle 7 (see FIG. 2) mounted on a self-propelled bogie 6 running on any one of the eight first tracks 5 laid immediately below the blast furnace. This self-propelled trolley 6
It is operated by an operator of an iron pouring plant based on an instruction of a department controlling a whole ladle operation in a steel mill. As shown in FIG. 2, a self-propelled bogie 6 has a weight measuring means of an open ladle 7 containing hot metal. The self-propelled trolley 6 is further provided with a detection sensor (not shown) for identifying the open ladle by a symbol attached to the open ladle.

In FIG. 1, a crane 9 for transferring an open ladle to an arbitrary self-propelled carriage 6 is provided above the first track 5. Reference numeral 10 denotes a cast iron machine. Four second tracks 11 are laid in a direction orthogonal to the first track 5, and the first blast furnace 1 or the second blast furnace 2 and the steelmaking plant 12 are linearly connected by the second track 11. I have. In the steelmaking plant 12, a first converter 13, a second converter 14, and a third converter 15 are installed. 16 is a desulfurization facility, and 17 is a slag scraping facility. If necessary, a hot metal pretreatment facility such as a dephosphorization facility or a silicon removal facility can be provided in the steelmaking plant. A molten metal charging facility (crane) 18 is installed in the steelmaking factory 12, and an open ladle mounted on a self-propelled bogie 6 ′ on the second track 11 in the steelmaking factory 12 by the charging facility 18. Can be transported to any one of the first to third converters. Note that the self-propelled carriage 6 'traveling on the second track 11 does not require a weighing function.

According to the molten metal transport equipment of the present invention configured as described above, hot metal is transferred from the first blast furnace or the second blast furnace to any one of the first to third converters as follows. Can be transported.

Now, the required charging amount from the first converter 13 is 2
If it is 00 tons, the content of this instruction is based on the instructions from the steelmaking process as the next process, and the department that controls the operation of the in-house ladle operates to instruct the operator of the pouring plant about the target position of the self-propelled bogie 6. Will be issued. Then, the self-propelled carriage 6 moves on the first track 5 to the lower part of the first blast furnace 1 or the lower part of the second blast furnace 2. For example, when receiving hot metal from the first blast furnace 1, the hot metal moves to the hot metal outlet of any one of the four main gutters 3 of the first blast furnace 1 and the hot metal outlet from the hot metal outlet to the hot metal surface. 200 tons of hot metal is received by the open ladle 7 while measuring the hot metal weight with the load cell 8 (see FIG. 2) while measuring the hot metal surface level by distance measuring means (not shown) for measuring the distance. In this case, a trouble occurs in the main gutter 3 during tapping of the first blast furnace 1 and the tapping cannot be performed halfway.
If only 180 tons of hot metal can be supplied to the self-propelled bogie 6 on the other first track 5 by the crane 9, the open ladle 7 is transferred from the other main gutter 3 to the remaining 20 tons. Can accept tons of hot metal.

After receiving 200 tons of hot metal from the first blast furnace 1 to the open ladle 7, as shown in FIG. 3, the open ladle 7 placed on the self-propelled bogie 6 traveling on the first track is removed. It is transferred to a self-propelled bogie 6 'traveling on the second track by the crane 9, and this self-propelled bogie 6'
It travels on the second track 11 shown in FIG. After the desulfurization equipment 16 desulfurizes the hot metal in the open ladle on the self-propelled bogie 6 ', the molten metal charging equipment 18 transports the open ladle to the slag scraping equipment 17, where the slag is scraped. .
Further, the molten metal charging equipment 18 transports the open ladle storing 200 tons of hot metal to the first converter 13 and injects 200 tons of hot metal into the first converter 13. Next, after a steelmaking process is performed in the first converter 13 for a predetermined time, a predetermined process is performed in a subsequent process such as a continuous casting facility.

FIG. 4 is a view showing another embodiment of the present invention. In FIG. 4, reference numerals 19, 20, and 21 denote a first blast furnace,
The second blast furnace and the third blast furnace are shown. In this embodiment, following a plurality of first tracks 22 laid near the first to third blast furnaces, a plurality of second tracks 23 on which the self-propelled bogie travels are laid in the same direction as the first track. A case where the first to third blast furnaces and the inside of the steelmaking plant 24 are connected linearly is shown. 25, 26, 27 are first converter, second converter, third converter, 28 is crane,
29 is a molten metal charging facility, and 30 is an electric furnace.

[0019]

As described above, the present invention has the following advantages. Since the metal melting furnace and the steelmaking factory are connected by an optimal access route according to the layout of the transportation system and the transportation equipment, the metal melting furnace and the steelmaking factory can be installed on any site. Hot iron can be charged to the steelmaking furnace from the open ladle filled with the required amount of hot metal in the steelmaking furnace without excess or shortage, so that no excess hot metal remains in the open ladle. It is possible to suppress a decrease in the temperature of the hot metal due to the transportation. The hot metal transfer vessel between the metal melting furnace and the steelmaking furnace only needs to be an open ladle, and there is no need to transfer hot metal to another vessel, so that heat loss and dust generation due to hot metal transfer can be minimized.

Since the open ladle filled with the required amount of hot metal charged by the steelmaking furnace is transported from the metal melting furnace to the steelmaking factory, direct tapping from the metal melting furnace and direct charging to the steelmaking factory are possible. Yes, it is possible to improve the productivity of the entire pig steel integrated steelworks. Since each open ladle is identified each time it is placed on the self-propelled bogie, the accuracy of hot metal weighing when pouring iron from the blast furnace cast floor is improved based on continuous management of the open ladle.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the entire arrangement of a molten metal transport facility of the present invention.

FIG. 2 is a side view of a self-propelled carriage on which an open ladle is placed.

FIG. 3 is a diagram illustrating a state in which an open ladle on a self-propelled trolley is transferred to another self-propelled trolley by a crane.

FIG. 4 is a diagram showing another embodiment of the entire arrangement of the molten metal transport equipment of the present invention.

FIG. 5 is a diagram illustrating a conventional hot metal transport system using a torpedo car.

FIG. 6 is a diagram illustrating a conventional hot metal transport system using an open ladle.

FIG. 7 is a view for explaining another conventional hot metal transfer system which also serves as an open ladle and a hot metal charging pot.

[Explanation of symbols]

 1, 19 ... first blast furnace (or first smelting reduction furnace) 2, 20 ... second blast furnace (or second smelting reduction furnace) 3 ... main gutter 4 ... inclined pouring gutter 5, 22 ... first track 6, 6 '... Self-propelled trolley 7 Open ladle 8 Load cell 9, 28 Crane 10 Cast iron machine 11, 23 Second track 12, 24 Steelmaking plant 13, 25 First converter 14, 26 Second converter 15, 27: third converter 18, 29: molten metal charging equipment 21: third blast furnace (or third smelting reduction furnace)

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) C21C 1/06 C21B 7/00

Claims (3)

(57) [Claims] 1. A molten metal discharged from a metal melting furnace,
Only the necessary amount of the steelmaking furnace is injected into an open ladle mounted on a self-propelled bogie having weight measuring means, and the self-propelled bogie travels on a first track laid immediately below or near the metal melting furnace. After that, the open ladle is transferred to another self-propelled bogie, and the self-propelled bogie is moved on the second track connecting the metal melting furnace and the steelmaking factory to the steelmaking factory, and then After the hot metal pre-treatment and / or slag scraping treatment, charge the molten metal directly into the furnace mouth without adjusting the charging amount by adding or transferring molten metal in any case. A molten metal transport system characterized by the following. 2. A crane which has a plurality of first tracks on which a self-propelled truck travels and which can transfer an open ladle to an arbitrary self-propelled truck is provided at an upper portion of the first track. Molten metal transport system. 3. A plurality of first tracks on which a self-propelled bogie having weight measuring means and having an open ladle mounted thereon travels, is laid immediately below or near a metal melting furnace, and the open ladle is moved above the first track. A loadable crane is installed, and after the first track, a plurality of second tracks on which another self-propelled truck travels are laid in a direction orthogonal to the first track or in the same direction, and a metal melting furnace is provided. A molten metal transfer facility, which is connected to a steelmaking factory, and has a molten metal loading facility for charging the molten metal in the open ladle into the furnace opening of the steelmaking furnace.