JPH0414716Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an apparatus for injecting granular pearlite into the cold insulation gap of a low-temperature tank. The present invention is particularly effective when the cold insulation gap is pressurized or when the cold insulation gap is filled with inert gas.

[Prior art] For example, when injecting granular perlite as a cold insulating material into the cold insulation gap between the inner and outer tanks of a double-shelled low-temperature tank, conventionally the perlite filling port is opened and the perlite is poured from the top of the tank by gravity to fill the tank. Method,
Also, methods of filling by applying pressure or suction using a fan or the like are used.

[Problems that the invention aims to solve] However, in such conventional methods, for example, if the space to be filled is pressurized, the internal gas may be released to the outside when the pearlite filling port is opened using the gravity drop method. There were some drawbacks.

In addition, even with the method of pressurizing with a fan, etc., if the hopper outlet valve is suddenly opened, the granular pearlite moves at a very high speed inside the pearlite delivery pipe due to the large pressure difference between the inside of the hopper and the cold storage gap, and the pearlite is sent out. Uneven areas inside the pipe, rough areas with high frictional resistance, curved pipe parts (elbow parts),
There were drawbacks such as the so-called "choke phenomenon" in which the pipes became clogged at points with different diameters (from the thick pipe to the thin pipe), and the pearlite grains stopping in the pearlite delivery pipe or flowing backwards due to incomplete control of the pressure difference. In addition, the cooling gap is approximately 50mmAqG,
For example, the pressure inside the hopper is 0.5Kg/cm ² G,
When the specific gravity of granular pearlite is about 60Kg/ ^m3 ,
When the hopper outlet valve is opened, granular pearlite is discharged into the pearlite delivery pipe in a lump at a rate of approximately 40m/sec.
Even if there are some irregularities in the pearlite delivery pipe, the lumpy granular pearlite collides with the inner wall of the pipe and is decelerated, causing the chiok phenomenon.

Furthermore, the method of suctioning with a fan or the like has the drawback that when the hopper outlet valve is opened, gas flows back into the hopper and granular pearlite flows pulsatingly due to a bridging phenomenon in the hopper.

In addition, if the space to be filled is filled with dry inert gas or flammable gas, in order to feed granular pearlite containing dry inert gas, the air in the hopper must be removed before filling the space. must be purged. That is, commercially available granular perlite bags are generally filled with air, and the hopper is filled with air when the bag is filled into the hopper.

As described above, all three methods have the disadvantage that purging is extremely difficult.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a suction port of an ejector having a pearlite delivery pipe connectable to a tank nozzle that communicates with the cold storage gap.
A lower outlet of a hopper located above, diagonally or horizontally in the ejector is connected through a hopper outlet valve, and a pressurized gas supply line having a valve is connected to the blast pipe of the ejector and the upper part of the hopper, respectively. By connecting them, a granular pearlite injection device was constructed. The hopper is provided with a hopper lid that can be sealed even when the inside of the hopper is pressurized,
The injection device may include a purge pipe and a purge valve for purging the gas in the hopper.

[Operation] When granular pearlite is placed in the hopper and gas such as nitrogen gas, air, carbon gas, etc. is fed into the hopper from the ejector through the inlet valve of the ejector from the blast pipe and from the pressurized gas supply line, the hopper is opened. Through the outlet valve, the granular pearlite in the hopper flows into the ejector by falling under its own weight, is sucked in, or is pressurized, and the pressurized gas from the blower pipe fills the cooling gap thoroughly through the pearlite delivery pipe. .

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows an embodiment of the present invention, in which inner and outer tanks 1 and 2 of a double-shell cryogenic tank 3 consisting of an inner tank 1 and an outer tank 2 are shown.
A tank nozzle 5 that communicates with the pressurized cold insulation gap 4 between the tanks is connected to one or more required positions of the outer tank 2, and the tank nozzle 5 is provided with a tank main valve 6 and a guide lid 24 for the perlite delivery pipe. be.

Above an ejector 8 having a pearlite delivery pipe 7 that can be inserted into the tank main valve 6 and the tank nozzle 5 and into the cold storage gap 4,
A hopper 9 for supplying a required capacity of granular pearlite is provided, and a hopper outlet 10 of the hopper 9 is connected to a suction port 12 of the ejector 8 via a hopper outlet valve 11.

Further, the pressurized gas supply main pipe 13 for supplying pressurized nitrogen gas, air, carbon dioxide gas, etc. is branched, and each of the branch pipes 14 and 15 is provided with an inlet valve 16 and 17, respectively. 14 and 15 are connected to the blow pipe 18 of the ejector 8 and the upper part of the hopper 9, respectively, to form a pressurized gas supply line 19.

With the above configuration, open the tank main valve 6 and connect the pearlite delivery pipe 7 at the tip of the ejector 8.
into the tank main valve 6 and tank nozzle 5,
The tip of the pearlite delivery pipe 7 is inserted into the cold storage cavity 4.

Close the hopper inlet valve 17 and hopper outlet valve 11, put the granular pearlite into the hopper 9, close the closed hopper lid 21, and open the ejector inlet valve 16 of the branch pipe 14 connected to the blower pipe 18 of the ejector 8 to blow air. Pressurized nitrogen gas is sent to the pipe 18, and after the pressure in the cold storage gap is overcome and the gas flow becomes constant, the hopper inlet valve 17 is opened, and then the hopper outlet valve 11 is opened.

Then, because the flow direction of the pressurized nitrogen gas in the blower pipe 18 and the suction port 12 are at a substantially perpendicular position, and because the pressure inside the hopper 9 is higher than that of the cold storage gap, the nitrogen gas falls from the suction port 12 due to its own weight. Alternatively, the granular pearlite that has flowed under pressure is carried by the pressurized gas and sent from the pearlite delivery pipe 7 into the cold storage gap 4.

To flow a large amount of granular pearlite, the ejector inlet valve 16 may be closed gradually, and to flow a small amount of granular pearlite, the hopper inlet valve 17 or hopper outlet valve 11 may be gradually closed. In this way, the flow rate of granular pearlite is determined by the above valve 1.
6 and 17 enable adjustment.

In this case, since the ejector inlet valve 16 or the hopper inlet valve 17 is always open, there is no significant change in the gas flow rate, so the granular pearlite stops in the pearlite delivery pipe 7, flows backward, or does not cause the chiyok phenomenon and allows stable transport of granular pearlite.

Note that in order to remove the air that enters the hopper 9 when the closed hopper lid 21 is opened, the hopper lid 21 is
1 is closed, the purge valve 22 provided in the purge pipe 23 is opened, and the hopper inlet valve 17 is opened to allow gas to flow into the hopper 9.
Air within the hopper 9 can be purged through the purge pipe 23. Further, in order to quickly purge the air in the lower part of the hopper 9, the branch pipe 15 connected to the hopper 9 may be further branched and connected to the lower part of the hopper 9 as shown in FIG.

Moreover, since the granular pearlite is fed together with the pressurized gas, it is evenly filled into every corner of the cold insulation cavity 4.

Incidentally, the granular pearlite injection device of the present invention is not limited to the above-mentioned embodiment, and may be configured such that the inlet valve 17 for blowing air to the hopper is opened while the inlet valve 16 for blowing air to the ejector is closed. The structure of the closed hopper lid is such that it can be closed with bolts 26 on the flange 25 shown in Figure 1, and with clips 27 as shown in Figure 2. It goes without saying that various changes can be made without departing from the gist of the present invention, such as using appropriate means depending on the pressure, and selecting the type of pressurized gas appropriate depending on the object of cold storage. It is.

[Effects of the invention] As described above, according to the granular pearlite injection device of the present invention, granular pearlite can be poured into the cold insulation gap in a pressurized container such as a cold storage layer of a low-temperature tank without opening the tank. It is possible to achieve various excellent effects such as being able to efficiently fill without causing a chiok phenomenon or a bridging phenomenon, and also without causing filling irregularities.

[Brief explanation of drawings]

FIG. 1 is an explanatory view of one embodiment of the granular pearlite injection device of the present invention, and FIG. 2 is a partial explanatory view of another embodiment of the granular pearlite injection device of the present invention. 1 is an inner tank, 2 is an outer tank, 3 is a double shell low temperature tank,
4 is a cold storage cavity, 5 is a tank nozzle, 7 is a perlite delivery pipe, 8 is an ejector, 9 is a hopper,
10 is a hopper outlet, 11, 16, 17 are valves, 1
2 is a suction port of the ejector, 13 is a pressurized gas supply main pipe, 14 and 15 are branch pipes, 18 is a blower pipe, 19
indicates a pressurized gas supply line.

Claims (1)

[Scope of utility model registration request] The lower outlet of the hopper is connected via a hopper outlet valve to the suction port of an ejector that has a pearlite delivery pipe connectable to a tank nozzle that communicates with the cold storage cavity, and valves are installed in the blast pipe of the ejector and the upper part of the hopper, respectively. 1. A granular pearlite injection device, characterized in that it is connected to a pressurized gas supply line having: