JPS6038666Y2 - Heat retention device for converter for nonferrous smelting - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for retaining heat in a converter for non-ferrous smelting, such as copper smelting, by blocking heat radiated to the outside from the furnace opening during wind down periods. be.

In copper smelting, the smelt produced from the smelting furnace is converted into blister copper. Normally, two converters are used regularly.

However, in order to suck both the exhaust gas from the smelting furnace and the exhaust gas from the converter into the sulfuric acid plant and to operate it economically, it is necessary to operate two converters at the same time due to the appropriate size of the sulfuric acid plant. Generally speaking, this is not possible.

Moreover, the converter is a batch operation, and the operation of the converter in the cycle requires several times of charging the steel, discharging the rawhide kalami, discharging the rawhide blister copper, etc. Therefore, if the operation cycle of the other converter is started after one cycle of one converter is completed, the time during which the air flow of the converter is interrupted will account for a considerable proportion of the time.

Therefore, in order to increase the throughput of steel and achieve efficient operation, the operating cycles of the two converters may be slightly staggered, so that when one converter is on a break, the air from the other converter is turned off. If the two furnaces are alternately blown as described above, the time during which air from the converter is interrupted can be greatly reduced compared to the case described above.

However, in the case of such a converter operation, when focusing on a single furnace, there is a period when the furnace is idle with the melt still in it, and a period when the furnace is idle until the final copper-making period is completed and the furnace is charged with steel again. There are two types of wind down periods: a period when the inside of the furnace is empty, but in both periods the converter stops operating and the furnace mouth is left open, so the inside of the furnace is directly exposed to outside air. contact,
A large amount of heat is dissipated to the outside from the furnace mouth.

Therefore, the temperature inside the converter fluctuates, which promotes spalling of the lining bricks, causing a shortening of the furnace life, and also causes the disadvantage that the amount of cool material such as waste copper throughput decreases during operation.

In order to improve this problem, heat compensation has been carried out by burning heavy oil, butane, etc. in the converter furnace when the converter is idle, but this has the disadvantage of consuming expensive fuel. be.

Therefore, closing the furnace opening with a lid during the period of rest of the converter is the most effective and advantageous method for heat retention, but when charging steel into the converter during the period of rest, , it becomes necessary to open the furnace port cover, but at that time, the other converter is in operation, and if only one converter is staffed for operation, the operator must open the converter while it is in operation. Since operations such as punching the siding and determining the end point are performed, it is cumbersome to move the converter to the converter where the material is charged and open and close the lid, which may lead to disturbances and delays in the converter operation. become.

This invention was made to solve all of the above problems, and it is equipped with a furnace mouth cover that opens and closes the furnace mouth of the converter using a motor, and an overhead crane that opens and closes the furnace mouth to charge the melt into the converter. This is done remotely from the driver's cab.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Fig. 1 is a schematic plan view showing the opening/closing operation of the furnace mouth lid in the heat retention device of the present invention, Figure 2 is a side view of the vicinity of the furnace mouth lid in the heat retention device of the present invention, and Figure 3 is a schematic plan view of the heat retention device of the present invention. This is the block diagram of

In FIGS. 1 and 2, 1 is a converter, 2 is a support vertically installed next to the converter 1, and 3 is a siding provided on the converter 1.

Further, 4 is an overhead crane used to charge the melt into the converter 1, and the support 2 is provided with a rotating shaft 6 rotatably supported by a vertically fixed holder 5. A rotating arm 7 is fixed to the converter 6, and at the tip of the rotating arm 7, there is a furnace mouth cover 9 having a shape capable of shielding the furnace mouth 8 of the converter 1, which is tilted to such an extent that the tuyeres 3 are not immersed in the hot water surface. installed.

Reference numeral 10 denotes a drop prevention chain provided to prevent the furnace mouth lid 9 from falling in the event that the attachment part between the swing arm 7 and the furnace mouth lid 9 is damaged. connected.

The upper part of the rotating shaft 6 is connected to a motor 12 fixed to the column 2 by a metal fitting 11, and the rotating shaft 6 can be rotated by driving the motor 12.

In addition, in the operator's cab 13 of the overhead crane 4, as shown in FIG. In the converter control room (not shown) provided nearby, there is a receiving device B consisting of an antenna 19, a reception demodulator 20, and a signal converter 21, and a motor control unit that controls the operation of the motor 12 connected to the receiving device B. A circuit 22 is provided.

Next, the operation of the heat retaining device configured in this way will be explained.

First, when the converter 1 is in operation, the furnace mouth cover 9 is rotated in the direction of arrow C in FIG. I'll keep it.

When the operation of the converter 1 is interrupted after completing one stage, or when the operation is finished and the tapping is finished, the converter 1 is tilted to a predetermined angle and stopped.

Thereafter, in the operator's cab 13 of the overhead crane 4, when the crane driver operates the operation bundle 14 of the transmitter A in the closing direction, the signal is converted into an electrical signal via the transducer 15, and the signal is converted into an electric signal by the signal converter 16 and the transmission modulator 17. The signal is then transmitted as a radio signal from the antenna 18.

The radio wave signal reaches an antenna 19 installed in the converter control room, is processed through a reception demodulator 20 and a signal converter 21, and is sent to a motor control circuit 22 as a signal to operate the motor 12 in the closing direction. The motor 12 rotates the rotary shaft 6, rotates the furnace mouth cover 9 in the direction of the arrow, and closes the furnace mouth 8 of the converter 1.

Since the furnace mouth 8 of the converter is closed by the furnace mouth cover 9 until new material such as glue is charged, the purpose of heat retention is distantly removed.

Next, when charging the converter 1 with matte, etc., the crane driver operates the operation bundle 14 of the transmitter A in the direction of opening.Similarly to the above-mentioned case of closing, the crane driver operates the operating bundle 14 of the transmitter A installed in the overhead crane 4. A and a receiving device B installed in the converter control room,
The motor 12 is operated via the motor control circuit 22, the furnace mouth cover 9 is turned again in the direction of arrow C to open the furnace mouth 8, and then a solution such as glue is introduced into the converter 1 using a ladle.

As explained in detail above, according to the heat retaining device of the present invention, by closing the furnace port with a lid during the air rest period of the converter, it is possible to prevent the heat inside the furnace from dissipating to the outside from the furnace port. So,
It is possible to retain heat in the converter without using expensive fuels such as heavy oil and butane, and it is possible to effectively prevent spalling of the converter lining bricks and extend the life of the reactor. It is possible to increase the amount of cold material processed not only by several sets but also by several sets.

In addition, since the opening and closing of the furnace mouth cover can be remotely controlled from the operator's cab of the overhead crane, it is possible to avoid disturbances and delays in converter operation caused by opening and closing operations performed by the converter operator, which has a significant effect on improving efficiency. be.

Although the above-mentioned embodiments have been explained using a Pierce-Smith type converter, the same can be applied to other types of converters. It goes without saying that the same method can be applied to converters as well.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a schematic plan view of one embodiment of the heat retaining device of the present invention, showing the opened and closed states of the furnace mouth cover, and Fig. 2 is a side view of the person with the furnace mouth lid attached to the device of the present invention. FIG. 3 is also a block diagram of the device of the present invention. 1...Converter, 4...Overhead crane, 7
...Swivel arm, butt, mouth, 9...
・Furnace cover, 12...Motor 13...
- Overhead crane operator's cabin, 22... Motor control circuit, A... Transmitting device, B... Receiving device.

Claims (1)

[Scope of utility model registration request] A furnace cover that is rotatably supported by a motor and can open and close the converter mouth, a radio wave transmitter installed in the operator's cab of the converter overhead crane, and a radio wave receiver installed near the converter. and a motor control circuit that is connected to the radio wave receiving device and controls the operation of the motor, and the furnace mouth cover is opened and closed by remote control from an operator's cab of an overhead crane. Heat retention device for iron smelting converter.