JPS6054084B2 - Separation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for separating suction material from a suction conveyance path and for condensing water vapor contained in a gas flow in the suction conveyance path.

As a device for separating the aspirate from the suction conveyance path, the applicant has previously proposed a negative pressure chamber communicating with the suction device, a liquid tank communicating with the negative pressure chamber, and communication between the liquid tank and the negative pressure chamber. We proposed a system consisting of an impeller installed in the section.

In such a device, the suction material is separated from the suction airflow in the negative pressure chamber, and the liquid in the liquid tank is prevented from flowing into the negative pressure chamber by the centrifugal action of the impeller, and the separated fluid is separated through the impeller. Drain the aspirate into a liquid reservoir. However, if the suction material is at a high temperature, the liquid in the liquid tank will become hot during operation, and if the hot suction material is discharged from the impeller into such high-temperature liquid, it will instantly boil near the impeller. A large amount of steam is generated as a result. This steam causes the pressure at the outlet of the impeller to be lower than atmospheric pressure, so that the high temperature liquid around the impeller flows back into the negative pressure chamber along with bubbles and steam. Furthermore, when this inflowing liquid comes into contact with the hot suction material, a large amount of steam is generated, which lowers the negative pressure and weakens the suction conveyance ability. The present invention can prevent backflow of liquid into the impeller, and
Moreover, the present invention provides a separation device that can simultaneously separate the suction material from the gas flow and condense the water vapor contained in the gas flow in the suction conveyance path. Thereafter, the scum on the surface of the molten metal is sucked, water is injected onto the sucked scum to solidify the scum,
An embodiment in which the present invention is applied to the case where the scum and water are separated from the suction air flow containing the solidified scum and the steam generated by the injected water and the steam is condensed will be described with reference to the drawings. Reference numeral 1 denotes a negative pressure chamber, which has a cylindrical side wall 1a, a load-shaped bottom wall lb continuous with the side wall 1a, and an upper wall lc covering the side wall 1a from above, and a suction device communication port 2 is provided in the side wall 1a. A suction flow inlet 3 is provided on the upper wall lc.

The suction device communication port 2 is connected to a suction device such as a vacuum pump. The suction flow inlet 3 is constituted by an opening at one end of an inflow pipe 3a that penetrates the upper wall lc and opens at the lower part of the negative pressure chamber 1, and the other end of the inflow pipe 3a is opened above the scum on the surface of the molten metal. It communicates with a suction head that sucks up the scum located in the area and sprays water onto the sucked scum. Negative pressure chamber 1
Inside, a condenser 4 is provided between the suction flow inlet 3 and the suction device communication port 2. The condenser 4 includes a solid-filled bed 5 and a cooling water supply device 6 disposed in a space above the solid-filled bed 5. The solid material filling layer 5 is formed by filling a pair of wire meshes 7, 7 fixed in the negative pressure chamber 1 with a synthetic resin solid material having a large porosity. The cooling water supply device 6 includes a distribution pipe 6a connected to a water supply pipe outside the negative pressure chamber 1 and provided with a large number of water spray nozzles 6b. A conical partition plate 8 is provided below the solid matter packed bed 5 to receive condensate water and cooling water. The partition plate 8 has a large number of ventilation holes 9 on the entire surface, and each ventilation hole 9
A cylindrical wall 9a is provided at the upper edge of. A load-shaped partition wall 10 is extended from the outer peripheral edge of the partition plate 8 and fits loosely into the inner surface of the bottom wall 1b of the negative pressure chamber 1 with a slight gap.
A communication portion 10b that communicates with the liquid tank 11 below the negative pressure chamber 1 is configured by the central cylindrical portion. In addition, inflow pipe 3
a penetrates the solid filling layer 5 and the partition plate 8, and the partition plate 8
It opens into the space 12 below. An impeller 14 submerged below the liquid level 13 of the liquid tank 11 is connected to the communication portion 10b. The impeller 14 is fixed to one end of a drive shaft 15 that passes through the bottom wall of the liquid tank 11, and is rotationally driven by a drive device connected to the other end of the drive shaft 15. The drive shaft 15 is supported by the liquid tank 11 via a cylindrical body 16. The impeller 14 includes a bottom plate 1 fixed to the drive shaft 15.
7, and a first annular plate 18 and a second annular plate 19, which are arranged opposite to each other with a gap on one side of the bottom plate 17, and between the bottom plate 17 and the first annular plate 18. A main radial flow path 21 is formed by a space partitioned by a plurality of radially provided blade bodies 20, and a plurality of radially provided blades 20 are formed between a first annular plate 18 and a second annular plate 19. body 2
A sub radial flow path 23 is formed by the space partitioned by 2. The first annular plate 18 is fitted onto the communication portion 10b via a labyrinth 24, and the inner end of the main radial channel 21 communicates with the communication portion 10b. The sub-radial flow path 23 constitutes a water discharge device, and the second annular plate 19 is externally fitted onto the cylindrical portion 25 of the bottom wall 1b of the negative pressure chamber 1 via a labyrinth 26. The inner end of the sub-radial flow path 23 communicates with the condenser 4 via a communication waterway 27 formed by a gap between the bottom wall 1 b of the negative pressure chamber 1 and the partition wall 10 . Next, to explain the operation, the suction airflow containing the red-hot scum sucked by the suction head and solidified by the jetted water, the jetted water, and the generated water vapor flows from the suction inlet 3 to the space 12 of the negative pressure chamber 1. flow inside.

When the suction airflow flows into the space 12, it is decelerated due to the increase in the cross section of the flow path, so that the scum and water, which have a heavy specific gravity, are separated from the suction airflow and fall into the communication portion 10b.
The fallen scum and water pass through the main radial channel 21 of the impeller 14 to the liquid tank 11 due to the centrifugal action of the impeller 14.
discharged inside. Further, due to the centrifugal action, the negative pressure in the negative pressure chamber 1 and the pressure of the liquid in the liquid tank 11 are equalized at a portion 21, and the liquid in the liquid tank 11 is prevented from flowing into the communication portion 10b. On the other hand, the suction airflow and water vapor that have flowed into the space 12 rise toward the suction device communication port 2 and pass through the ventilation hole 9 of the partition plate 8 and the solid material filling layer 5. Since the cooling water injected from the water spray nozzle 6b flows down inside the solid-filled bed 5, the rising water vapor is heat exchanged with the cooling water and condenses. This condensate and cooling water fall onto the top surface of the partition plate 2,
The sub radial channel 23 of the impeller 14 passes through the communication channel 27
leading to. This condensate and cooling water are then discharged from the sub-radial flow path 23 to a distance from the impeller 14 by centrifugal action. At this time, the condensate and cooling water are discharged due to the centrifugal action regardless of the negative pressure in the negative pressure chamber 1. Since the scum discharged from the impeller 14 has a high temperature,
During operation, the liquid in the liquid tank 11 becomes high temperature.

When red-hot scum is released into such high-temperature liquid, boiling occurs instantaneously near the outlet of the impeller 14, generating a large amount of steam and bubbles. The generated steam and bubbles are then swept away from the impeller 14 by the water discharged from the sub-radial flow path 23. Therefore,
The liquid seal at the outlet of the main radial flow path 21 of the impeller 14 is maintained, preventing a pressure drop, and therefore the fluid in the liquid tank 11 does not flow back into the negative pressure chamber 1, and the fluid inside the negative pressure chamber J1 There is no problem of negative pressure drop due to steam generation. Moreover, since the water used to wash away the steam and bubbles is the condensate generated in the condenser 4 and the used cooling water, no extra water source is required and the configuration is simple. Further, in the above embodiment, since the partition plate 8 is provided, condensate water and cooling water do not fall into the space 12 or the communication portion 10b, and contact with scum in the negative pressure chamber 1 and generation of water vapor is prevented. can. Although the cylindrical wall 9a of the ventilation hole 9 of the partition plate 8 is not necessarily required, if the cylindrical wall 9a is provided, the water that falls on the partition plate 9 and flows will be absorbed into the ventilation hole 9.
You can reliably prevent it from falling. Water droplets of condensate or cooling water falling directly into the ventilation holes 9 and entering the space 12 can be prevented by setting the diameter or number of the ventilation holes 9 appropriately and blowing up suction air from the space 12 through the ventilation holes 9. This can be prevented by obtaining a sufficient flow rate.
In the above embodiment, the impeller 14 has a double structure and the sub-radial flow path 23 constitutes the water spraying device, but the water spraying device may be a nozzle fixedly installed near the impeller 14. In that case, a suction or discharge drive device such as a pump is required in the communication waterway leading from the condenser 4 to the water discharge device.
The present invention can be implemented as described above, and according to this, the separation of the suction material from the suction conveyance path and the condensation of the water vapor contained in the suction airflow can be performed in the same device. When used to separate high-temperature suction materials, the problem of reduced suction power due to boiling that occurs at the impeller outlet can be prevented by using condensed water or cooling water used for condensed water.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a sectional view and FIG.
The figure is an enlarged sectional view of the impeller. 1... Negative pressure chamber, 2... Suction device communication port, 3... Suction flow inlet, 4... Condenser,
5... Solid matter packed bed, 6... Cooling water supply device, 8... Partition plate, 9... Ventilation hole, 10b...・Communication part, 11... Liquid tank, 14... Impeller, 21... Main radial channel, 23... Sub radial channel (water discharge device), 2
7...Connecting waterway.

Claims (1)

[Claims] 1 A liquid tank communicating with the negative pressure chamber is provided below the negative pressure chamber, an impeller is provided in the communication section between the liquid tank and the negative pressure chamber, a condenser is provided inside the negative pressure chamber, and the condensate water is A suction device communication port is provided in the negative pressure chamber above the condenser, a suction inlet opening facing the impeller is provided in the negative pressure chamber below the condenser, and a water discharge device is provided near the impeller. Place the
A separation device characterized in that a communication waterway is connected from the condenser to a water discharge device.