JPH05125413A - System for receiving molten iron - Google Patents

Abstract

PURPOSE:To provide a system for receiving molten iron, in which labor can be saved and molten iron quantity to be received in a molten iron ladle can automatically be controlled to the desired quantity even in any case. CONSTITUTION:This system is the molten iron receiving system for receiving the molten iron tapped from a blast furnace into the molten iron ladies 13a, 13b from an tilting trough 11. Further, this system provides level meters 15a, 15b for detecting the molten iron level in the molten iron ladle 13a, 13b, load cells 14a, 14b for detecting the molten iron wt. in the molten iron ladle and a detecting part for detecting the signals from the level meter and load cell, and when the signal from at least one side in the level meter and the load cell reaches the prescribed value, the receive of the molten iron in the previous molten iron ladle is completed and the tilting trough is changed over to the other side of molten iron ladle side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot metal receiving system for receiving hot metal tapped from a blast furnace from a tilting gutter into a hot metal ladle.

[0002]

2. Description of the Related Art Hot metal tapped from a blast furnace passes through a hot metal gutter provided in a casting floor,
Guided by an inclined gutter. The slant trough has hot metal outlets on both sides thereof, and a hot metal ladle for receiving hot metal is arranged below them. Then, by tilting the tilting gutter to one of the outlet sides, the hot metal is received by the hot metal ladle placed below it. Then, when the hot metal reaches a predetermined amount, the tilting gutter is returned to the original state, and the receiving of the pot is completed. After that, the tilting gutter is tilted to the opposite side to start receiving the hot metal ladle placed on the other exit side.

In the case of receiving hot metal from the blast furnace in this way, conventionally, when an operator visually monitors the liquid level in the hot metal ladle, when it reaches about 80% (270T) of the hot pot. So, I changed the tilting gutter so that it could be received in another pot. However, in the case of such a method, since a human judgment is used as a reference, an error is likely to occur and it is against the demand for labor saving. In order to avoid such a problem, a method of grasping the hot metal level using sounding or microwave is also adopted.

However, even when such a level meter is used, the hot metal subjected to cast bed desiliconization causes foaming or the like in the hot metal ladle to reach a predetermined level with a weight less than a predetermined weight. There are cases where it will end up. In such a case, the rotating efficiency of the pot is poor, and the hot metal temperature may be significantly lowered.

The present invention has been made in view of the above circumstances, and it is possible to save labor, and in any case, the amount of hot metal to be received in the hot metal ladle is automatically set to a desired amount. An object is to provide a hot metal receiving system that can be controlled.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a hot metal receiving system for hot metal tapped from a blast furnace from a tilting gutter to a hot metal ladle. Level meter for detecting the hot metal level of the hot metal, a load cell for detecting the weight of hot metal in the hot metal ladle, and the level meter and the load cell.
A detection unit for detecting a signal from the dowel cell, and when the signal from at least one of the level meter and the load cell reaches a predetermined value, the conventional hot metal ladle is finished receiving, and the tilting trough is connected to the other. Provided is a hot metal receiving system characterized by switching to the hot metal ladle side.

[0007]

In the present invention, the system is provided with the level meter for detecting the level of the hot metal in the hot metal ladle and the load cell for detecting the weight of the hot metal in the hot metal ladle, and the signal from at least one of them is detected. Even in the case of forming, the amount of hot metal can be controlled automatically and accurately. Further, even if the volume of the pot changes or the amount of hot metal to be received changes, the amount of received hot metal can be accurately controlled from these detected values, and it is possible to sufficiently cope with diversification.

[0008]

Embodiments of the present invention will be described in detail below.

FIG. 1 is a diagram schematically showing an example of the pig-iron receiving system according to the present invention. Hot metal 2 tapped from the blast furnace
Is guided to the tilting gutter 11 through the hot metal gutter 1. Inclined gutter 1
1 has hot metal outlets on both sides, and is tilted to either of the outlet sides by a motor 12. Under the respective hot metal outlets, hot metal ladles 13a and 13b are arranged, respectively. Then, the hot metal is poured into the hot metal ladle (the hot metal ladle 13a in the figure) on the side on which the tilting gutter 11 is tilted.

A load cell 14a for measuring the weight of the hot metal in the hot metal ladle is provided at the installation position of the hot metal ladle 13a, and a microwave oscillator 15a for grasping the hot metal level is provided above the hot metal ladle 13a. Is provided. Also,
Similarly, a load cell 14b and a microwave oscillator 15b are provided on the side of the hot metal ladle 13b. Furthermore, 1 hot metal pot
Monitoring TVs 16a and 16b for monitoring the inside of these are installed above 3a and 13b, respectively.

Next, the operation of the pig iron receiving system thus constructed will be described with reference to FIG. The level of hot metal in the hot metal ladle and the weight of hot metal are set in the process controller 18 in advance. At this time, one or both of the level and the weight are controlled. The control in this case outputs a signal to the arithmetic unit 19 according to the set value set in the process controller 18, and further controls the molten pig iron pot based on the signal from the arithmetic unit 19.
And the controlled object among the hot metal level and the weight is selected by the switch unit 17. For example, in order to control both the hot metal level and the weight of the hot metal ladle 13a, the switch unit 17
Among them, the switches 17a and 17c are turned on, the switches 17b and 17d are turned off, and the load cell 1
4a and the signal of the microwave oscillator 15a are input to the process controller 18 (see FIG. 2). Then, when the signal input to the process controller 18 from the load cell to be controlled and the microwave oscillator reaches the set value, the process controller 18 outputs a switching signal to the motor 12. This signal causes motor 1
2 is driven, the tilting gutter 11 is tilted to the other, and the receiving of the next hot metal ladle is started. In addition, when setting the weight, make sure that the weight of the hot metal is clear so that the tare (pot itself) is
Set the weight of. In addition, the setting values of the hot metal ladle were input in the order of receiving the hot metal ladle set values (the weight of the hot metal and the level from the top of the hot metal), as shown in Fig. 3, for example. Do it using the recipe.

Which of the hot metal level and the weight is selected depends on the amount of brick wear in the hot metal pot and the presence or absence of desiliconization of the hot metal (presence or absence of forming). For example, when there is no silicon removal treatment, the control is performed with emphasis on the level, and when there is silicon removal treatment, the control is performed with emphasis on the weight. This is because when the silicon removal treatment is performed, a reaction of 2FeO + Si → SiO ₂ + 2Fe occurs and the forming is likely to occur, and the weight is insufficient when the level is controlled. In this case, hot metal is added until the predetermined weight is reached when the forming is stopped.

Further, when the damage to the brick is small, it is possible to control by emphasizing the level. However, when the damage to the brick becomes severe, the volume of the hot metal ladle is changed, and therefore the weight is emphasized in the control. To do. When both the level and the weight are controlled, the degree of damage to the brick of the hot metal ladle can be grasped conversely by using one of these values. Furthermore, in the case of a small lot, it can be dealt with by changing the setting in advance.

As described above, the means for grasping both the level and the weight of the hot metal are provided, and at least one of them is controlled to receive the pig iron. The amount of hot metal to be received in the hot metal ladle can be automatically controlled, and it is possible to sufficiently cope with diversification. Also, by monitoring these, centralized management can be performed at a position apart from the pig iron receiving position, and labor can be saved. Furthermore, the monitoring TV 16a, 1
By installing 6b, the state of the hot metal in the hot metal ladle can be monitored in the central control room.

Next, the result of actual pig iron reception using the pig iron receiving system of the present invention will be described. For hot metal without desiliconization, when the hot metal weight is set to 270T and the hot metal level is set to 0.5m from the top of the pan, and for hot metal with desiliconization, when the hot metal weight is set to 230T and the hot metal level is set to 1m from the top of the pan Table 1 shows the weight of hot metal actually received and the level of hot metal.

[0016]

[Table 1]

As shown in Table 1, when there is desiliconization,
It was confirmed that the variation in control was extremely small in both cases where there was no removal, and that the weight of hot metal that was received did not significantly decrease when desiliconization was performed. As a result, the rotation efficiency of the hot metal ladle increased, and the decrease in hot metal temperature decreased by about 30 ° C. Next, Table 2 shows the result of a test conducted by a worker visually without using the piggyback system of the present invention and with the same target setting.

[0018]

[Table 2] As shown in this table, there was a large variation when visually judged, and the values were far from the set values. From this result, the effectiveness of the present invention was confirmed. The present invention is not limited to this embodiment and can be variously modified. For example, the control method is not limited to this embodiment.

[0019]

According to the present invention, labor saving can be achieved, and in any case, the amount of hot metal to be received in the hot metal ladle can be automatically controlled to a desired amount. A receiving system is provided. Therefore, it is possible to cope with diversification, and moreover, it is possible to increase the rotation efficiency of the hot metal ladle and reduce the decrease in the hot metal temperature.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing an example of a pig iron receiving system according to the present invention.

FIG. 2 is a block diagram showing a control system of the pig-iron receiving system according to the present invention.

FIG. 3 is a diagram showing an example of inputting set values for a hot metal ladle.

[Explanation of symbols]

11 ... Inclined gutter, 13, 13b ... Hot metal ladle, 14a, 1
4b: load cell, 15a, 15b ... level meter, 1
8: Detection section.

Claims (1)

[Claims] 1. A hot metal receiving system for hot metal tapped from a blast furnace from a tilting gutter to a hot metal ladle, which comprises a level meter for detecting the level of hot metal in the hot metal ladle and a weight of hot metal in the hot metal ladle. And a detection unit for detecting the signals from the level meter and the load cell, and at the time when the signal from at least one of the level meter and the load cell reaches a predetermined value. A hot metal receiving system characterized by terminating the hot metal ladle reception and switching the tilting gutter to the other hot metal ladle side.