JPS5925877Y2 - Converter pressure measuring device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an in-furnace pressure measuring device for preventing molten slag from scattering outside from the furnace mouth during converter blowing (hereinafter referred to as slopping).

In the blowing operation of a converter, when slopping occurs during blowing, in order to prevent this slopping, the amount of oxygen supplied to the blowing lance is usually reduced, the blowing lance is lowered, and the slag is removed. We are trying to suppress slopping by adjusting the blowing equipment by reducing the contact area.
Conventional methods for detecting slopping during blowing include applying microwaves to the slag surface from the converter mouth and measuring the absolute level on the slag surface, or installing a microphone around the converter mouth. A determination method has been proposed that detects the occurrence of slopping based on the acoustic change when slopping occurs, but when microwaves are used, the transmittance decreases due to dust or the sensor is damaged due to heat. Furthermore, when using acoustic changes, it is difficult to determine the occurrence of slopping because it is easily influenced by the surroundings of the converter and the outside.

For this reason, the current practice is to detect the occurrence of slopping visually.

However, with the visual detection method of slopping, the adjustment of the blowing equipment to prevent slopping is delayed, the occurrence of slopping cannot be immediately suppressed, and the yield decreases.
This was also causing problems in blowing operations.

As a result of various experiments, the inventor has already learned that there is a proportional relationship between the pressure inside the furnace during blowing and the occurrence of slopping, and from this relationship, the pressure inside the furnace during blowing can be detected. It was recognized that slopping can be prevented by adjusting the blowing equipment.

This invention was made based on the above opinion, and one embodiment thereof will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, a concave ring is formed by fixing a cross-sectional cylinder 8 to the inner peripheral surface of the open end of an outer cylinder that can come into contact with the flange end surface of the converter tapping hole 7. A long cylindrical probe 3 for insertion into a tapping hole is installed at the center of the inner surface of the probe stand 2, which is provided by filling the groove 9 with a sealing material 1 such as rock wool and closing the end face of the proximal end of the outer cylinder. A probe carriage 4, which supports the probe stand 2 by protruding from it and fixing a probe arm 10 to the center of the outer surface of the probe stand 2, is connected to the advancement/retraction device 5 toward the tapping hole 7. A pressure measuring device 6 such as a diaphragm type pressure gauge is connected via a conduit 12 such as a heat-resistant hose to a pressure measuring device 6 such as a diaphragm pressure gauge and a furnace pressure take-off pipe 11 whose base end is partially bored and connected.

The advancing/retracting device 5 has a pulley support column 13 suspended from a frame 14 at a position between two points near and far toward the converter tapping hole 7, and a front portion and a front portion are respectively attached to the lower ends of the pulley support columns 13 and 13. The chain pulleys 1115□ and 15□ at the rear are attached, and a rail 16 is installed horizontally between the pulley support columns 13 and 13, and the probe truck 4 is engaged with the rail 16. □.

The front and rear ends of the advancing/retreating chain 17 that extends between 15□ are fixed to the front and rear surfaces of the probe truck 4.

Furthermore, a driving chain 19 for the motor 18 suspended from the pedestal 14 near the rear pulley support column 13 is provided so as to extend over the rear chain pulley 15□.
When activated, the advance/retreat chain 17 interlocked with the drive chain 19 is actuated to move the probe cart 4 onto the rail 16.
It has a mechanism to move forward and backward along
The height position of the advancing/retracting device 5 is set so that it faces into the space 7.

20 is a limit switch for detecting the forward position of the probe cart; 21 is a limit switch for detecting the backward position;
22 is a control panel, and 23 shows its wiring.

Further, the conduit 12 is arranged by an appropriate means so as not to hinder the forward and backward movement of the probe cart 4, and the furnace pressure is transmitted to the pressure measuring device 6 through this conduit 12, and the furnace pressure measured here is transmitted to the pressure measuring device 6. The internal pressure value is immediately displayed on the pressure display device 24.

In addition, 25 is a heat shield plate, 26 is a converter, and 27 is a blowing lance.

Now, when measuring the pressure inside the furnace during blowing using the above device,
The advancement/retraction device 5 is started based on the start instruction from the control panel 22, and
The probe cart 4 is moved forward.

Then, at the same time that the probe carriage 4 comes into contact with the limit switch 20 for detecting the forward position, a stop signal is issued to the advancement/retraction device 5, and the probe carriage 4 is stopped.

At this stop position, the ring groove 9 provided in the probe carriage 4
The sealing material 1 is in close contact with the flange end face of the tapping hole 7, and leakage of furnace gas from inside the tapping hole 7 is prevented.

At the same time, about the middle of tapping hole 7 (approximately 400
The probe 3 is inserted up to 1 mm), and the furnace pressure passes through the probe 3, and is then transmitted to the pressure measuring device 6 via the furnace pressure extraction pipe 11 and the conduit 12, where it is measured. After that, the pressure is displayed by the pressure measuring device 24, and the operator gives an adjustment instruction to the blowing equipment according to this value.

Therefore, during blowing, the furnace pressure is continuously measured by the above device, and when the furnace pressure increases, the blowing equipment is adjusted to suppress slopping.

After blowing, the advance/retreat device 5 is activated in response to a backward instruction from the control panel 22 to move the probe truck 4 backward, and at the same time as the probe truck 4 contacts the limit switch 21 for detecting the backward position, a stop signal is sent to the advance/retreat device 5. The probe carriage 4 is stopped, and the measurement of the furnace pressure is completed.

By this operation, blowing operation can be performed in which slopping is prevented from occurring.

Further, when measuring the pressure inside the furnace, leakage from the tapping hole 7 is made airtight by the sealing material 1, but it is also possible to further improve the airtightness by attaching an electromagnet or the like to the sealing part.

In this way, the pressure inside the furnace during converter blowing is measured directly from inside the tapping hole using a series of measuring devices, so it is possible to accurately grasp changes in the pressure inside the furnace over time without being affected by external influences. ,
The blowing equipment can be adjusted accurately.

As mentioned above, this idea was developed by installing a device to measure the pressure inside the furnace, which is closely related to the occurrence of slopping, in order to prevent the slopping that tends to occur during converter blowing. Therefore, it is possible to accurately grasp the blowing condition inside the furnace and always perform proper blowing.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an embodiment of the furnace pressure measuring device of this invention, and FIG. 2 is an enlarged view of the main part of FIG. 1. 1...Sealing material, 2...Blow table, 3...Fu. Robe, 4... Probe trolley, 5...
Advancement/retraction device, 6... Pressure measuring device, 24...
...Pressure display device.

Claims (1)

[Scope of utility model registration request] A long cylindrical probe 3 for insertion into the tap hole is protruded from the center of a probe stand 2, which has a sealing material 1 attached around the open end that contacts the flange end surface of the converter tap hole, and is supported. This is an in-furnace pressure measuring device for a converter, in which a probe cart 4 is connected to an advancing/retracting device 5 that moves forward and backward toward a tapping hole, and the probe 3 is connected via piping to a pressure measuring device 6.