JP7323773B2 - HEATING METHOD AND HEATING DEVICE FOR SEPARATE TRUCK CAR - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heating method and a heating apparatus for heating the inside of a standby torpedo car.

In a steel plant, molten iron produced in a blast furnace is mainly transported to a steelmaking plant by a torpedo truck. A torpedo car is used simply as a device for transporting hot metal, or as a treatment vessel in which hot metal is subjected to preliminary treatment such as dephosphorization, desiliconization, and desulfurization while it is being transported. In order to accommodate hot metal in the torpedo car, the inner wall of the torpedo car is made of refractory material.

Usually, the torpedo trucks operating in the steelworks are waiting near the hot metal discharge part of the blast furnace to receive hot metal, the one that contains the hot metal and is in the process of transporting it to the steelmaking plant, and the one that transports the hot metal to the converter ladle Some of them are returned to the blast furnace again after being discharged to the blast furnace. Such a spare torpedo torpedo car is required to receive molten iron that continues to be tapped from the blast furnace in an emergency such as when trouble occurs in the steelmaking plant and the steelmaking plant cannot accept the molten iron. there is

Conventionally, this backup torpedo car is incorporated in an operating line that shuttles between a blast furnace and a steelmaking plant. However, incorporating a spare pig-metal car into the operating line lowers the turnover rate of the pig-metal car, resulting in a longer empty time and a decrease in the amount of heat stored inside the torch-car. When the amount of heat stored decreases, the temperature of the molten iron drops significantly while it is being transported from the blast furnace to the steelmaking plant. sometimes Furthermore, if the temperature inside the torpedo car decreases, the refractory inside the torpedo car may be damaged due to a sudden temperature difference acting on the refractory when receiving hot metal.

In order to retain the heat of such an empty torpedo truck, for example, Patent Document 1 discloses a method in which solid fuel obtained by drying and pressurizing municipal waste is thrown into the torpedo truck and burned. discloses a method of charging and burning bricks having a high carbon content.

Japanese Patent Application Laid-Open No. 2005-105310 JP 2008-101261 A

However, both of the methods of Patent Document 1 and Patent Document 2 are methods of throwing combustibles containing carbon into a torpedo car in an operating line, and it is necessary to provide equipment for that purpose in the operating line. In addition, these methods require moisture control of the input to prevent steam explosion when receiving hot metal. Also, these methods do not improve the turnover rate of the torpedo car.

In order to suppress the temperature drop inside the torpedo car during operation, it is preferable to increase the turnover rate of the torpedo car. However, in the case of a torpedo car that is in operation, it is possible to keep the internal temperature above a certain level by receiving molten iron at regular intervals, but if it is completely removed from the operating line, it can quickly receive molten iron in an emergency. In order to make it possible, it is necessary to always keep the heat above a certain temperature.

The present invention has been made in view of this point, and is intended to improve the rotation rate of the torpedo torpedo car in the steelworks to suppress the temperature drop of the torpedo torpedo car in operation, and to quickly turn on the torpedo car for emergency. It is an object of the present invention to provide a heating method and a heating apparatus for keeping molten pig iron at a temperature that can be received in a furnace.

In order to solve the above problems, the present invention provides a method for heating the interior of a spare torpedo torpedo car that is deployed at a standby location in preparation for an emergency, comprising: After removing the spare pig-metal car and heating one spare pig-metal car with a burner for a predetermined heating time for raising the temperature to a target temperature and storing heat, the burner is removed from the said pig-metal car. During the waiting time until the internal temperature of the torpedo car falls to the lower limit temperature at which molten iron can be received from the blast furnace, the burner heats another spare torpedo car, and the torpedo car is heated during the waiting time. places a heat-retaining lid at the inlet of the torpedo car after heating, and when the temperature of the torpedo car initially heated falls to the lower limit temperature, the torpedo car that was first heated by the burner is heated again. By repeating the step of heating, a single burner is used to heat a plurality of spare pig-metal cars so that the internal temperature of the spare pig-metal car does not fall below the lower limit temperature.

The heating time may be set such that the standby time is an integral multiple of the heating time, and a single burner may sequentially heat a plurality of spare torpedo torpedo cars.

In addition, the present invention is a device for heating the inside of a spare pig-metal car that is arranged at a standby place in preparation for an emergency, and is capable of being put in and out of a plurality of spare pig-metal cars that are removed from the operating line. and a burner for heating the inside of the pig-metal car;

According to the present invention, by removing the spare pig-metal car from the operating line, the rotation rate of the pig-metal car in the operating line can be improved, and the spare pig-metal car is kept at a predetermined temperature by the burner. Therefore, in an emergency, hot metal can be quickly received into a spare torpedo torpedo car.

FIG. 4 is a diagram showing a state in which the torpedo car is heated by the heating device according to the embodiment of the present invention; FIG. 4 is a graph showing an example of temperature transitions during heating and non-heating of a torpedo car to which the present invention is applied; FIG. FIG. 4 is a graph showing the temperature transition of two pig-metal cars when heating two pig-metal cars with one burner as an example of the embodiment of the present invention. FIG. 5 is a graph showing an example of different temperature progressions during heating and non-heating of a torpedo car to which the present invention is applied; FIG. 5 is a graph showing the temperature transition of three pig-metal cars when heating three pig-metal cars with one burner as an example of a different embodiment of the present invention; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In this embodiment, the operation line of the torpedo trucks in the steelworks is provided with the required number of torpedo torpedo trucks for storing and transporting the hot metal that is normally discharged from the blast furnace and processed in the steelmaking plant. The spare torpedo trucks that are deployed at the time are placed in a waiting area off the operating line. A spare torpedo torpedo car is set up at a standby place, for example, 500,000 to be able to immediately receive molten iron from the blast furnace when it becomes impossible to receive molten iron into the steelmaking plant due to a malfunction in the steelmaking plant, or in an emergency such as a trouble with the refractory of the torpedo torpedo car. The heat is maintained until the temperature does not fall below the lower limit temperature of °C. This lower limit temperature is the minimum temperature required to prevent damage to the refractories inside the torpedo torpedo vehicle and solidification of the molten iron when the torpedo torpedo vehicle for standby is moved from the standby location to the blast furnace and receives molten iron, for example, 300°C or more. is appropriately set according to the conditions of the steelworks. The temperature here means the ambient temperature inside the torpedo car, and is a value measured by a thermocouple provided in the vicinity of the iron receiving port.

FIG. 1 is a diagram for explaining an example of a heating device for a torpedo torpedo vehicle for backup, and is a cross-sectional view of a torpedo torpedo vehicle 10. As shown in FIG. The torpedo car 10 has a substantially long cylindrical main body 11 that accommodates molten iron produced in a blast furnace. The main body 11 has a structure that can rotate around its long axis, and has substantially conical conical portions on both sides in the longitudinal direction, the diameter of which decreases toward the tip. Moreover, the iron hole 13 is formed in the central part in the longitudinal direction. The iron hole 13 has a neck portion 14 extending vertically outward from the main body 11 , and a refractory material 12 is applied to the inner walls of the main body 11 and the neck portion 14 . FIG. 1 shows a vertical cross-section of a tow car 10 containing hot metal. During heating, it is better to tilt the tow car 10 so that the iron receiving port 13 is at a position lower than directly above the torch car 10. Since it is difficult to escape, the torpedo car 10 may be rotated around its long axis and tilted.

In this embodiment, the heating device 1 comprises a pair of burners 2, and the burner 2 is arranged substantially in the center of the iron hole 13, as shown in FIG. If the burner 2 enters the inside of the main body 11 through the iron receiving port 13, there is a risk that the burner 2 will be damaged due to the deposits adhering to the inner wall of the main body 11 peeling off during heating. It is preferably arranged within the iron mouth 13 . Further, if the flame of the burner directly hits the monolithic refractory at the corner 15 of the boundary between the neck 14 of the iron hole 13 and the main body 11, the refractory at the corner 15 may be damaged. 2 is preferably oriented in a direction such that the flame does not hit the corner 15 and the heat sufficiently reaches both ends of the torpedo car 10 in the longitudinal direction. The shape and arrangement of the burner 2 used in the present invention are not limited to those described above. Moreover, conventionally well-known various burners can be used.

Further, in the present embodiment, an attachment/detachment device 4 for attaching/detaching the heat retaining lid 3 made of a refractory material is installed to/from the iron receiving port 13 of the hot metal car 10 after heating. The attachment/detachment device 4 includes, for example, a mechanism for holding the heat insulation lid 3 and a mechanism capable of transporting the heat insulation lid 3 to the positions of the pig iron inlets 13 of the plurality of torpedo torpedo cars 10 .

The spare pig-metal car 10 may be, for example, one burner 2 for one pig-metal car 10, and may continue heating so as to maintain the lower limit temperature or higher, or one burner 2 may be used to heat a plurality of mixed pig-metals. The car 10 can also be heated. A method of heating a plurality of torpedo cars 10 with one burner 2 will be described below.

FIG. 2 is a graph showing the relationship between the temperature inside the torpedo car 10 and time when the inside of the torpedo car 10 is heated by the burner 2 and then the burner 2 is removed. This data is obtained by an experiment with a thermocouple attached to the . When heating, after raising the temperature to a target temperature of, for example, 1000° C., heating is continued for a certain period of time until the temperature distribution in the thickness direction of the refractories 12 in the torpedo car 10 becomes substantially uniform. By accumulating heat in the refractory 12 in this manner, the rate of decrease in temperature after the burner 2 is removed can be delayed.

In the case of FIG. 2, the heating time t1 for temperature rise and heat storage is about 12 hours, and the standby time t2 from when the heating is stopped until the temperature drops to 500° C. set as the lower limit temperature is about 12 hours. It's becoming

FIG. 3 shows the temperature histories of two pig-metal cars (pig-pig car A and pig-metal car B) showing the temperature histories shown in FIG. 2 when they are heated by one burner. is. In the case of FIG. 2, the ratio of the heating time t1 for temperature rise and heat storage to the waiting time t2 from when heating is stopped until the inside of the torpedo car drops to the lower limit temperature (500° C.) is 1:1. In this case, the other pig-metal car (B) can be heated with the same burner during standby after heating one pig-metal car (B). At the timing when heating of the pig-metal car B is completed, the temperature of the pig-metal car A is lowered to the lower limit time, and the process of heating the pig-metal car A again is repeated.

FIG. 4 shows the tow car 10 in which the inside of the tow car 10 is heated by the burner 2, and after the burner 2 is removed, the heat retaining lid 3 made of refractory material is provided in the iron receiving port 13 of the tow car 10. 10 is a graph showing the relationship between temperature inside 10 and time. By providing the heat retaining lid 3 to the hot metal inlet 13 of the torpedo car 10 after heating, the speed of the temperature decrease can be further delayed, and the waiting time t2 from when the heating is stopped until the temperature decreases to the lower limit of 500°C. is approximately 24 hours. That is, by using the heat insulating lid 3, the standby time t2 can be lengthened by about 12 hours.

Fig. 5 shows the temperature history of three torpedo trucks (toller truck A, torpedo truck B, and torpedo truck C) showing the temperature histories shown in Fig. 4 when heating with one burner. It shows history. In the case of FIG. 4, the ratio of the heating time t1 for temperature rise and heat storage to the standby time t2 from when heating is stopped until the inside of the torpedo car drops to the lower limit temperature (500° C.) is 1:2. In this case, during standby after heating one torpedo car (toller car A), the other two torpedo car cars (tower car B and torch car C) can be sequentially heated with the same burner. At the timing when heating of the torpedo car C is completed, the temperature of the torpedo car A, which was heated first, drops to the lower limit temperature, and the process of heating the torpedo car A again is repeated.

In the heating of the standby torpedo car 10 out of the operating line, the standby time t2 during which the temperature drops to the lower limit temperature after the burner 2 is removed is for the temperature to rise to the target temperature and for the refractory to have a certain amount of heat storage. It is preferable to adjust the heating time t1 so as to be an integral multiple of the heating time t1 by the burner 2 including the accumulated heat. Thereby, a cycle of heating a plurality of torpedo cars 10 with one burner 2 can be realized without waste. Since the temperature history after heating differs depending on the shape and size of the torpedo car 10, the type of the refractory 12, etc., the temperature history should be experimentally measured in advance to set the heating time t1.

As described above, according to the present invention, by removing the spare pig-metal car 10 from the operating line, the turnover rate of the pig-metal car in the operating line is improved, the empty time is shortened, and the temperature drop is reduced. can be suppressed. By heating the spare torpedo torpedo car 10 with the burner 2 to keep the molten iron above the lower limit temperature for receiving the molten iron, the car can be quickly incorporated into the operating line in an emergency. Further, when a plurality of torpedo cars 10 are heated by one burner 2, the heating can be efficiently performed, and if the heat retaining lid 3 is used, the temperature decrease rate after heating is slowed down, and the standby time t2 is reached. can be lengthened, the cost of heating can be reduced.

In the above embodiment, all the spare pig-metal cars are removed from the operating line and heated by the burners. You may make it heat by.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope of the technical idea described in the claims, and these are also within the technical scope of the present invention. be understood to belong to

INDUSTRIAL APPLICABILITY The present invention is useful as a heating method for heating a standby torpedo torpedo car in a steelworks that deploys a torpedo torpedo car for use in preparation for emergencies.

Reference Signs List 1 heating device 2 burner 3 lid 4 attachment/detachment device 10 torpedo car 11 main body 12 refractory 13 iron receiving port 14 neck 15 corner

Claims (3)

A method for heating the interior of a spare torpedo car deployed at a standby location in preparation for an emergency, comprising:
Remove the spare torpedo car from the operating line that goes back and forth between the blast furnace and the steelmaking plant,
After heating for a predetermined heating time for raising the temperature to a target temperature and storing heat with a burner for one spare pig-metal car, the burner is removed from the pig-metal car, and the internal temperature of the torch-car is However, during the standby time until the temperature drops to the minimum temperature at which hot metal can be received from the blast furnace, the burner heats another spare torpedo torpedo car,
During the waiting time, a heat-retaining lid is placed at the inlet of the torpedo car after heating,
When the temperature of the torpedo car that was heated first falls to the lower limit temperature, the step of heating the torpedo car that was first heated by the burner again is repeated, and the temperature inside the backup torpedo car is reduced to the above- mentioned A method for heating a standby torpedo torpedo car, characterized by heating a plurality of standby torpedo torpedo cars with one burner so as not to fall below the lower limit temperature. The heating time is set such that the waiting time is an integral multiple of the heating time, and a single burner is used to sequentially heat a plurality of spare torpedo torpedo cars. Item 1. The method for heating a spare torpedo car according to item 1 . A device for heating the inside of a spare torpedo car that is deployed at a standby location in preparation for an emergency,
a burner that can be sequentially taken in and out of a plurality of spare pig-metal cars removed from the operating line and that heats the interior of the pig-metal cars;
and an attachment/detachment device for attaching/detaching a heat insulating cover to/from the inlet of the torpedo torpedo car.

Images