JPS6225954B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing slag.
Various methods have been proposed to remove slag from the surface of the molten metal, but the most efficient method is a suction method as proposed in Japanese Patent Application Laid-open No. 18226/1983, which was previously proposed by the applicant. There is. That is, slag is sucked through a suction port connected to a suction device, and water is injected onto the suctioned slag to cool and solidify the slag, and the cooled and solidified slag, the injected water, and the steam generated by the water are combined. In this method, the slag and water are separated from the suction air flow containing a mixture of the above before reaching the suction device, and the separated slag and water are discharged to the outside of the suction air flow path. With this method, slag and water do not reach suction devices such as vacuum pumps and rotary blowers, making it possible to remove slag by efficient suction with less load on the suction device. However, this method also had some points to be improved. That is, in this method, slag and water are removed from the suction air flow path, but when the slag moves through the suction air flow path in a high temperature state, it is converted into water vapor by the high temperature slag in the suction air flow path, and this water vapor is A part of the capacity of the suction device is used for processing (discharging), and a problem arises in that a suction device with an extra large capacity is required.

The present invention solves the above conventional problems,
It is an object of the present invention to provide a slag removal method that can minimize the generation of water vapor in a suction air flow path.

In order to achieve the above object, the slag removal method of the present invention sucks slag from a suction port connected to a suction device, and injects water to the sucked slag to cool and solidify the slag. A suction airflow containing a mixture of the slag, injected water, and steam generated by the water is passed through a separation hopper to separate the slag and water from the suction airflow, and the tip of the sleeve provided in the separation hopper is inserted into the water tank. The slag and water separated by the separation hopper are discharged into the water in the water tank through the sleeve while rotating an impeller placed facing the opening at the tip of the sleeve underwater. It is structured as follows.

According to this configuration, since the separated slag is placed in water, the generation of water vapor in the suction air flow path can be minimized, and the capacity of the suction device is not wasted for discharging water vapor. By rotating the impeller, you can maintain negative pressure in the separation hopper and prevent water from entering the water tank into the separation hopper. Slag and water from the hopper can be continuously discharged into the water tank.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, 1 is a ladle, 2 is a molten metal, and 3 is a slag. Reference numeral 4 denotes a suction head, which is composed of a tip member 4a made of a heat-resistant material and a main body part 4b.A water cooling jacket 5 is provided on the outer peripheral surface of the main body part 4b, and a water cooling jacket 5 is provided at the lower end of the suction head to direct the water in the water cooling jacket 5 into the suction head. A water injection channel 6 is provided to eject water. Also, the jacket 5 has a water supply pipe 7.
and a lead-out pipe 10 having an air relief valve 8 and a safety valve 9 at its tip. 11 is a pressure gauge provided in the water supply pipe 7, and 12 is a valve. The suction head 4 is connected to a slag separation device 20 via a suction line 16 comprising a connecting pipe 13, a flexible tube 14, a connecting pipe 15, and the like. Note that the suction head 4 and the suction line 16 are not limited to those shown in the drawings, and may have various structures.

The slag separating device 20 consists of a separating hopper 21 and a discharge section 22, the detailed structure of which is shown in FIG. In FIG. 2, the separation hopper 21
A slag inlet pipe 23 is provided at the upper end of the slag inflow pipe 23, and its lower end opening 23a is located approximately in the center of the separation hopper 21. Further, a suction port 24 is formed in the upper peripheral wall of the separation hopper 21 to communicate with a suction device. A discharge port 25 at the lower end of the separation hopper 21 is connected to the discharge section 22. Said outlet 2
A sleeve 26 is attached to 5 by bolts and nuts through a seal packing 27, and the sleeve 26 is immersed below a water surface 29 communicating with a water tank 28 disposed on the side thereof. In this example,
A pair of water tanks 28 are provided at appropriate intervals on both sides of the sleeve 26, and the upper portions of these water tanks 28 are communicated with each other by a communication gutter 30. The sleeve 26 is located at the center of the communication gutter 30. It is located. 31 is a support stand for the separation hopper 21. 32 is an impeller disposed directly below the sleeve 26 for sending the slag and water that have fallen through the sleeve 26 to the water tank 28 on the side, and includes a lower disk 33 having a mounting boss 34 in the center; , an upper annular plate 35 that fits over the lower end of the sleeve 26, and a blade 36 attached between these plates 33, 35. 37 is aquarium 2
8 and the communication gutter 30 so as to face the outer periphery of the impeller 32, and is for preventing the water in the water tank 28 from rotating due to the rotation of the impeller 32. It is. On the other hand, the impeller 32 has a rotating shaft 3 that passes through the center of the bottom plate 38 of the communication gutter 30 from below.
It is fixed to the upper end of 9. This rotating shaft 39 is
It is rotatably supported by a bearing box 41 attached to the lower plate 38 via a mounting barrel 40,
A V-belt rotated by an unillustrated drive device is wound around a V-pulley 42 fixed to the lower end of the rotating shaft 39, so that it can be rotated. In the bearing box 41, 43 is a bearing, 44 is a bearing holder/bearing cover, and 45 is a bearing cover. Further, in the mounting barrel 40, 46 is a water seal boss portion through which the rotating shaft 39 passes toward the inside of the communication gutter 30, 47 is a felt ring thereof, 48 is a sleeve, and 49 is a sleeve holder. Further, 50 is an overflow tank attached to the upper part of the water tank 28, and the water tank 28 is
8 and maintains the water level in the water tank 28 constant. 52 is a drain pipe from the overflow tank 50. Reference numeral 53 denotes a slag removal lid provided at the bottom of the water tank 28, but the slag accumulated in the water tank 28 may be continuously discharged using a sludge conveyor or the like. Note that the separation hopper 21
The suction port 24 of is connected to the condenser 60 via a connecting pipe 54.

The detailed structure of the condenser 60 will be explained with reference to FIGS. 3 and 4. 61 is an inner cylinder whose upper end is closed, and 62 is an outer cylinder whose upper and lower ends are both closed. These inner cylinder 61 and outer cylinder 62 constitute a main body container 63 having a double structure. 64 is a filler layer provided in the inner cylinder 61 that increases the contact efficiency between water vapor and cooling water and promotes the condensation of water vapor, and a filler layer 65 made of polypropylene of a special shape with a very large porosity is placed above and below. The space between the wire meshes 66 is filled. The upper space 67 of the filling material layer 64 communicates with a suction device connection port 68 connected to a suction device, and within this space 67 are numerous nozzles that spout cooling water toward the filling material layer 64. 69 are provided. This nozzle 69 is attached to a distribution pipe 70 fixed to the upper wall of the inner cylinder 61, and is arranged so as to spray cold water evenly over the entire upper surface of the filler layer 64. 71 is a water supply pipe communicating with the distribution pipe 70. 69a is the outer cylinder 6
A cooling water injection nozzle is disposed in an annular space 72 between the inner cylinder 61 and the inner cylinder 61, and is provided in a distribution pipe 70a communicating with the water supply pipe 71. The annular space 7
2 communicates with the space below the filler layer 64,
A suction airflow inlet 73 is provided in the upper part of this annular space 72 in the tangential direction of the outer cylinder 62 . Further, a condensate storage section 74 is formed at the bottom of the outer cylinder 62, and a pump 75 for discharging water in this storage section 74 to the outside of the main container 63 is installed within the storage section 74. 76 is a suction port of this pump 75, and 77 is a discharge port. 78 is a pump drive motor installed outside the main container 63, and 80 is a seal provided in the main container 63 at the penetrating portion of the drive shaft 79. Although the main body container 63 of this condenser 60 has a double structure, the main body container 63 may have a single layer structure by locating the suction airflow inlet 73 below the filler layer 64.

The suction device connection port 68 of the condenser 60 is connected to a suction device 83 such as a vacuum pump or rotary blower via a connection pipe 81 and a stop valve 82, and the discharge port 84 of this suction device is connected to the silencer 8.
5 to the atmosphere. 86 is a pressure gauge.

Next, the operation will be explained. When the suction device 83 is activated, negative pressure is created in the suction head 4 through the inside of the condenser 60 and the inside of the separation hopper 21, and the slag 3 is suctioned. At this time, the water supplied into the jacket 5 by the water supply pipe 7 is ejected into the suction head through the water injection channel 6, so that the sucked slag 3 is cooled and solidified, and in a desirable embodiment, it is rapidly cooled and pelletized. . The cooled and solidified slag, water, and generated water vapor flow into the separation hopper 21 of the slag separation device 20 through the suction pipe 16 together with the suction air flow. At the opening 23a of the slag inflow pipe 23 of the separation hopper 21, the cross-sectional area of the suction flow path rapidly increases, so that the flow rate of the suction airflow sharply decreases. Therefore, the slag and water with heavy specific gravity fall towards the discharge port 25 below, while the suction air current and water vapor exit from the opening 23a, descend slightly, then rise and exit from the suction port 24, thus being sucked. Slag and water are separated from the air stream.

The still hot slag and water that have fallen into the discharge port 25 collide with the mounting boss 34 of the impeller 32 through the sleeve 26, and are immediately and continuously discharged into the water tanks 28 on both sides by the action of the impeller 32.
At this time, the impeller 32 is given rotational force by the V-pulley 42, thereby discharging the slag and water into the water tank 28, and at the same time creating a head that balances the vacuum pressure (negative pressure) in the separation hopper 21. is made so that the outer circumference of the lower end of the sleeve 26 and the inner circumference of the upper annular plate 35 of the impeller 32 are several mm.
Water is allowed to infiltrate through the gap, and air is blocked from entering so that a water-sealed state is always exhibited. Therefore,
The slag and water are continuously discharged into the water tank 28 while the vacuum pressure (negative pressure) in the separation hopper 21 is maintained at all times. The high-temperature slag discharged into the water tank 28 generates steam within the water tank 28, and this water vapor is released from the water surface into the atmosphere. Moreover, since the impeller 32 is always immersed in water and cooled, the impeller 32 does not become hot even if it comes into contact with high-temperature slag.

On the other hand, the suction airflow containing water vapor coming out of the suction port 24 flows into the suction airflow inlet 73 of the condenser 60 via the connecting pipe 54, descends while swirling within the annular space 72, and flows into the inner cylinder 61. It flows into the filler layer 64 evenly from the entire circumference of the lower end, and the entire filler layer 64 is effectively utilized due to this uniform inflow. on the other hand,
Cooling water is injected from the nozzle 69, and while the cooling water flows down inside the filler layer 64, the water vapor exchanges heat with the cooling water and condenses. For this condensation, the water vapor and cooling water pass through the filler layer 64 made of the filler 65 with a large porosity, so that a large contact area or contact time between the water vapor and the cooling water is obtained. As a result, high-temperature steam can be condensed even under negative pressure with a high degree of vacuum. The condensed water vapor and cooling water flow down to the condensate storage section 74 at the bottom of the outer cylinder 62 and are discharged to the outside of the main container 63 by the pump 75. Note that if the pump 75 is placed outside the main container 63, the high degree of negative pressure inside the main container 63 will suck air into the pump from the seal portion of the pump 75, making it difficult to start the pump. However, by arranging the pump 75 in the condensate reservoir 74 and keeping it submerged at all times as in this embodiment, there is no pressure difference between the inside and outside of the pump 75, and the pump can be started reliably.

On the other hand, the suction airflow, from which water vapor has been condensed and removed while passing through the filler layer 64, flows through the upper space 67, the suction device connection port 68, the connection pipe 81, and the stop valve 82.
It flows into the suction device 83 through the exhaust port and is discharged into the atmosphere via the silencer 85.

As explained above, according to the slag removal method of the present invention, water is injected to the sucked slag to cool and solidify the slag, and a mixture of the cooled and solidified slag, water, and steam generated by the water is removed. Since the slag and water are separated from the suction air flow and placed in water, the generation of water vapor in the suction air flow path can be minimized, and the capacity of the suction device is not wasted in discharging water vapor. Not only can the suction capacity be improved, but by rotating the impeller, the negative pressure inside the separation hopper can be maintained and water in the water tank can be prevented from entering into the separation hopper. The slag and water from the separation hopper can be continuously discharged into the water tank.

[Brief explanation of the drawing]

The drawings show an embodiment of the apparatus for carrying out the method of the present invention, and FIG. 1 is a partial cross-sectional overall front view, and FIG.
3 is a longitudinal sectional front view of the slag separator, FIG. 3 is a longitudinal sectional front view of the condenser, and FIG. 4 is a sectional view taken along the line -- in FIG. 3. 3...Slag, 4...Suction head, 5...
. . . Water cooling jacket, 6 . . . Water injection flow path, 16 . . . Suction pipe line, 20 .

Claims (1)

[Claims] 1 Slag is sucked through a suction port connected to a suction device, and water is injected onto the suctioned slag to cool and solidify the slag, and the cooled and solidified slag, the injected water, and the steam generated by the water are combined. A suction airflow containing a mixture of is passed through a separation hopper to separate slag and water from the suction airflow, and the tip of the sleeve provided in the separation hopper is immersed below the water surface in the water tank, and the sleeve is inserted into the opening at the tip of the sleeve underwater. A slag removal method comprising discharging the slag and water separated by the separation hopper into water in a water tank through the sleeve while rotating impellers arranged facing each other.