JPH0416699B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to arc furnace equipment that improves the operating rate of the furnace and reduces the electric power consumption rate.

[Conventional technology]

In steelmaking using an arc furnace, scrap is charged as a raw material, but the scrap is preheated by exhaust gas discharged from the melting furnace during melting before charging.

In conventional arc furnace equipment, scrap is once charged into a scrap bucket, and in that state, the exhaust gas from the melting furnace is lowered to the required temperature and preheated.
Next, the scrap was moved from the preheating position to the scrap charging position and charged into the melting furnace, but the conventional arc furnace equipment had the following drawbacks.

(i) Since the preheating tank is a scrap bucket, high temperature exhaust gas cannot be introduced, a device for adjusting the exhaust gas temperature is required, and the preheating temperature cannot be made very high.

(ii) The life of the preheating tank (scrap bucket) is short.

(iii) Since the exhaust gas after preheating is still quite high in temperature, a gas cooler was used to lower the temperature sufficiently before releasing it into the atmosphere.

(iv) Scraping after preheating is carried out by moving the scrap bucket to the charging location, so a trolley is required to support and move the scrap bucket, which increases the scale of the equipment and makes it difficult to charge the scrap. It takes time.

[Problem that the invention seeks to solve]

In view of the above circumstances, the present invention eliminates the need to adjust the exhaust gas temperature for preheating and the exhaust gas temperature after preheating, eliminates the need for a cooler, reduces equipment costs, sets the preheating temperature to a high temperature, lowers the power consumption rate, and speeds up the process. This is intended to improve the operating rate of the furnace.

[Means for solving problems]

In the present invention, at least three furnaces are installed on a turntable at desired intervals, and the turntable has a function that allows for intermittent feeding, and each operation of melting, tapping, furnace repair, raw material charging, and preheating is performed. is an arc furnace equipment in which melting is performed only at a predetermined location, and the preheating furnace is a dual-purpose furnace for preheating and melting, and the exhaust gas generated from the furnace during melting is introduced directly into the preheating furnace. It is something that

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The turntable 1 can be rotated freely around a rotation axis 2, and a circular rail 3 is installed concentrically with the rotation axis 2.
It is supported via a rotating wheel 4. At least one of the turning wheels 4 is provided with a turning drive device 5 so that the turntable 1 can travel (rotate) and can stop at every required angle (60° in this embodiment). be.

Further, six sets of furnaces 7 supported by brackets 6 so as to be tiltable are provided on the upper surface of the turntable 1, and each furnace 7 can be tilted by a tilting cylinder 8. Air supply port 9 on the center side
has been established. Each furnace 9 is always at a fixed position (station) by the divided rotation of the turntable 1.
Among the six stations, A is a melting station, B is a tapping station, C is a scrap charging station, and D to F are preheating stations.

Above the melting station A is a rotating top lid 10.
The upper cover 10 is provided with an electrode 12 connected to a power source 11 and a dust collecting elbow 13. Further, a fixed type upper lid 14 is provided above the preheating stations D to F, and can be lifted up and down by a cylinder 16 provided on a beam 15 extending over the roof (not shown). Of the upper lids 14, the one at station D is provided with an exhaust duct 17 for releasing exhaust gas into the atmosphere, and the one at station E is provided with a connecting duct 18 communicating with the air supply port 9 of station D. Each of the devices is provided with a connecting duct 19 that communicates with the air supply port 9 of the station E. Further, a required gap is provided between the connecting ducts 18, 19 and the air supply ports 9, 9 so that each furnace 7 can be freely rotated.
Further, a connecting duct 20 is provided that communicates the dust collection elbow 13 with the air supply port 9 of the station F, so that each furnace 7 can be freely rotated and the rotatable upper cover 11 can be rotated. A required gap is provided between the connecting duct 20, the air supply port 9, and the connecting duct 20. 21 in the figure is a pot truck.

Although not particularly shown here, the exhaust duct 17 and the connecting ducts 18, 19, and 20 are supported by a necessary means from the building side.

Next, a steel manufacturing process using the equipment configured as described above will be explained.

First, when starting the operation, scraps are charged into the furnace 7 at the scrap charging station C, and the scraps are charged while the turntable 1 is sequentially and intermittently fed. When the furnace loaded with scrap reaches the melting station A, electricity is applied to the electrode 12 to generate an arc and melt the scrap.
High-temperature exhaust gas generated by melting the scrap is exhausted from the dust collection elbow 13 and guided into the furnace of station F through the connecting duct 20, preheating the scrap in the furnace of station F, and then passing through the connecting duct 19. Air is supplied to the furnace of station E. Similarly, the exhaust gas supplied into the furnace of station D is discharged to the atmosphere through the exhaust duct 17.

Thus, the scrap in the furnaces of station E and station D is also preheated by the exhaust gas,
The temperature of the exhaust gas decreases each time it passes through each preheating station, and by the time it passes through the exhaust duct 17, it is at a temperature that does not cause any problem even if it is released into the atmosphere.

When the melting is completed, the electrode is pulled up, the turntable 1 is rotated 60 degrees, the electrode 12 is set in the furnace sent from the preheating station F, and the furnace 7 of the tapping station B is tilted by the tilting cylinder 8. , transfer the molten steel to the casting pot on the pot truck. Furthermore, the furnace moved to scrap charging station C is charged with scrap.

By sequentially repeating the above steps, steel manufacturing can be performed continuously. Further, although the exhaust gas flowing into the preheating station F is at a high temperature, since the container into which the scraps are charged is the furnace 7, there is no problem even if the scraps are melted, and the preheating temperature can be conveniently increased. Furthermore, the heat of the exhaust gas can be used without waste.

Further, as described above, the series of steel manufacturing processes progresses in sequence, and there is no loss time, so the operating rate of the equipment is dramatically improved.

In addition to the above-mentioned stations, a station for repairing the furnace, that is, a furnace repair station may be provided.

〔Effect of the invention〕

As described above, according to the present invention, the following excellent effects can be exhibited.

(i) A series of processes including melting, tapping, preheating, and charging are completed on a turntable, making the equipment extremely compact.

(ii) The operating rate will improve dramatically.

(iii) It is possible to save energy by using the heat of exhaust gas as residual heat until it reaches a temperature that can be released into the atmosphere.

(iv) Also, equipment costs are reduced because a gas cooler is not required.

(v) Since preheating is also performed in a furnace, the service life is long, scrap can be preheated at extremely high temperatures, and the electricity consumption rate for melting can be lowered.

[Brief explanation of drawings]

FIG. 1 is a plan view of the equipment according to the present invention, and FIG. 2 is an elevational view of the same. 1 is a turntable, 5 is a turning drive device, 7
1 is a furnace, 18, 19, and 20 are continuous ducts, A is a melting station, B is a tapping station, C is a scrap charging station, and D to F are preheating stations.

Claims (1)

[Claims] 1. At least three furnaces are installed on a turntable at desired intervals, and the turntable is equipped with a function that enables intermittent feeding, and the melting position, tapping position, raw material charging position, and preheating The arc furnace equipment is characterized in that the positions are respectively determined positions, and each of the furnaces can be stopped at these determined positions. 2. The preheating furnace is a preheating furnace and a melting furnace, and
The arc furnace equipment according to claim 1, wherein exhaust gas generated from the furnace during melting is directly introduced into the preheating furnace. 3. Claim 2, wherein there are two or more preheating furnaces, and each preheating furnace is connected by an exhaust gas duct.
Arc furnace equipment as described in section.