JPS6215194Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a seal pot.

Conventionally, in the chemical industry, when storing liquids that have a pungent odor at room temperature, such as styrene, in tanks, the process of pressurizing the tank to a certain level with an inert gas, such as nitrogen (hereinafter abbreviated as sealing operation), is carried out. .

Figure 1 shows an example of a seal pot used in this case, where a is a storage tank for seal water b;
c is an inlet nozzle connected to a tank (not shown), d is an outlet nozzle communicating with the atmosphere, e is a seal water supply pipe, f is a seal water overflow pipe, and g is a drain nozzle.

In this seal pot, when the inside of the tank is pressurized, the gas inside the tank passes through the inlet nozzle c and seals the seal water b under pressure, as shown by arrow A. The pressure corresponds to that of water in the illustrated state.

In this type of seal pot, if the above-mentioned seal operation device fails while the liquid is being transferred by the pump, the inside of the tank will become under negative pressure. Then, the seal water in the seal pot is gradually drawn into the inlet nozzle c, and as a result, there is a risk that the tank will buckle.
That is, the above-mentioned seal pot operates when the inside of the tank is pressurized, but has the disadvantage that it does not operate when the inside of the tank is under negative pressure.

Therefore, in order to operate even with negative pressure inside the tank, the prior art (Utility Model Application No. 52-106818) formed the seal pot into a two-layer structure consisting of an upper water tank and a lower water tank.
No.).

According to this prior art, when the pressure inside the tank is positive, the lower water tank is activated to exhaust the gas inside the tank, and when the inside of the tank is under negative pressure, the upper water tank is activated to introduce atmospheric air. It is.

However, in this prior art, it is not possible to change the type of liquid in the tank or to make adjustments due to seasonal changes in external conditions.

The purpose of the present invention is to solve the above-mentioned drawbacks of the prior art and provide a two-layer seal pot that can adjust the set pressure in response to changes in the type of liquid in the tank or changes in external conditions due to seasonal changes. shall be.

The present invention will be explained below with reference to the embodiment shown in FIG.

The two-layer seal pot of the present invention essentially consists of an upper water tank 1 and a lower water tank 2. The lid 3 of the upper water tank 1 is equipped with a gas inlet nozzle 4 from the tank and a communication pipe 5 for suctioning atmospheric air.

An adjustment nozzle 6 that is slidable in the vertical direction is provided at the tip of the atmosphere suction communication pipe 5.
The depth at which the communication pipe 5 is underwater becomes the working pressure of the tank's negative pressure. A seal water supply nozzle 8 is provided on the side plate 7 of the upper water tank 1.

The partition plate 9 between the upper water tank 1 and the lower water tank 2 includes a drain pipe 10 of the upper water tank, and a communication pipe 11 extending between the gas phase part of the upper water tank 1 and the liquid phase part of the lower water tank 2.
Also provided is an overflow pipe 12 for keeping the liquid level in the upper water tank 1 constant. An adjustment nozzle 13 that is slidable in the vertical direction is provided at the tip of the communication tube 11. The underwater depth of the communication pipe 11 becomes the operating pressure for pressurizing the tank. The overflow pipe 12 is provided to keep the water level in the upper water tank 1 constant and to supply seal water to the lower water tank 2. Further, the underwater portion of the overflow pipe 12 in the lower water tank 2 needs to be larger than the above. A drain nozzle 15 is installed on the bottom plate 14 of the lower water tank 2.
However, the side plate 16 is provided with a gas discharge pipe 17, and the side plate 17 is provided with a seal water overflow nozzle 18. It is preferable to provide a water washing mechanism 20 near the outlet of the nozzle 17 for the purpose of washing the gas. The water washing mechanism includes a spray nozzle, a water shower, and the like. In this invention, the gas exhaust pipe 17
Although the communication pipe 5 and the communication pipe 5 are assembled in the middle, they do not need to be assembled.

19 is a seal water supply nozzle, 20 is a shower, 21 is a level meter for checking the seal water level in the water tank, and 22 is seal water.

In the present invention, the inner diameters of the gas inlet nozzle 4, atmospheric suction communication pipe 5, communication pipe 11, and gas discharge pipe 17 are determined by the amount of compression and expansion of the gas in the tank space and the amount of pump feed depending on the outside air temperature of the liquid in the tank and the temperature of the liquid itself. Determined by etc.

In addition, the tips of the communication pipes 5 and 11 are provided with adjustment nozzles 6,
13 has a sliding structure, but it is not necessary to use a sliding structure if the pressurization of the tank and the operating pressure of the negative pressure are determined at the design stage of the seal pot.

When the water washing mechanism 20 is used, it is not necessary to use the nozzle 8 of the upper water tank 1 if seal water is supplied from the nozzle 19.

The seal pot of the present invention operates as follows.

The tank internal pressure acts inside the upper water tank 1 at all times. When the internal pressure of the tank exceeds the set pressure, the positive pressure is applied to the seal water 22 of the upper water tank 1.
It acts on the liquid level and also acts on the seal water 22 in the communication pipe 11 through the communication pipe 11. As the internal pressure of the upper water tank 1 increases, the liquid level of the seal water 22 in the upper water tank 1 decreases, and the liquid level in the atmosphere suction communication pipe 5 rises accordingly. On the other hand, the liquid level of the seal water 22 in the lower water tank 2 rises due to the pressure acting on the liquid level of the seal water 22 in the communication pipe 11 through the communication pipe 11, but the rising seal water 22 passes through the seal water overflow nozzle 18. Drained. In this way, the liquid level in the communication pipe 11 becomes lower than the liquid level at the set pressure, so that the gas in the tank is discharged into the lower water tank 2 through the communication pipe 11. The gas discharged into the lower water tank 2 enters the chamber of the lower water tank 2 via the seal water 22 and is discharged through the gas exhaust pipe 17. At this time, the exhaust gas is washed with water by the water washing mechanism 20 before being exhausted into the atmosphere.

Next, when the tank internal pressure becomes lower than the set pressure, the negative pressure acts on the liquid level of the seal water 22 in the upper water tank 1 and acts on the seal water 22 in the communication pipe 11 through the communication pipe 11.

As the internal pressure of the upper water tank 1 decreases and the seal water 22 in the upper water tank 1 becomes negative pressure, the liquid level of the seal water 22 in the atmosphere suction communication pipe 5 lowers. Accordingly, the liquid level of the seal water 22 in the water tank 1 rises, but the increased seal water 22 is transferred to the overflow pipe 1.
2 and overflows into the lower water tank 2.

On the other hand, the seal water 22 in the communication pipe 11 is caused by the negative pressure acting in the lower water tank 2 through the communication pipe 11.
The liquid level rises. As a result, the liquid level of the seal water 22 in the water tank 2 is lowered, but the water level is kept constant by the seal water 22 from the upper water tank 1 overflowing through the overflow pipe 12.

In this way, the liquid level of the seal water 22 in the communication pipe 11 rises and the liquid level of the seal water 22 in the atmosphere suction communication pipe 5 falls, so that air in the atmosphere is removed from the atmosphere suction communication pipe 5. Enter the upper aquarium 1 room,
This will keep the pressure inside the tank constant.

The one shown in FIG. 3 is of a type in which a gas exhaust pipe 17 is inserted into the atmosphere suction communication pipe 5, and its function is the same as that shown in FIG. 2.

In the type illustrated in Figure 2, the following conditions are met: Upper water tank 1 has an inner diameter of 508 mmφ and height is 500 mm Lower water tank 2 has an inner diameter of 508 mmφ and height is 500 mm Nozzles 4, 5, 11, and 17 have inner diameters of 80 mmφ Nozzle 11 is submerged Part () 50 mm Underwater part of nozzle 5 () 50 mm Nozzle 12 A two-layer seal pot with an inner diameter of 40 mm was attached to a styrene storage tank. As a result, it was confirmed that the tank could be used without any problem even at its maximum receiving and extracting capacity.

As described above, according to the two-layer structure seal pot according to the present invention, adjustment nozzles that can be adjusted in the vertical direction are provided at the lower ends of the atmospheric suction communication pipe and the gas communication pipe, so that the type of liquid in the tank can be adjusted. Setting conditions can be changed as external conditions change depending on the season. Furthermore, since the gas communication pipe is provided inside the water tank, the entire installation can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an example of a conventional seal pot, Fig. 2 is a longitudinal sectional view showing an example of a two-layer seal pot according to the present invention, and Fig. 3 is a longitudinal sectional view showing another embodiment. . 1... Upper water tank, 2... Lower water tank, 4... Gas inlet nozzle from the tank, 5... Communication pipe for atmospheric suction, 11... Communication pipe, 12... Overflow pipe, 17... Gas discharge pipe, 22... Seal water.

Claims (1)

[Scope of utility model registration request] An upper water tank and a lower water tank are separated by a partition plate, and a communication pipe is connected to the gas phase part of the upper water tank to communicate with the inside of the tank, and one end is opened to the liquid phase part of the upper water tank, and the other end is opened to the atmosphere. A communication pipe for atmospheric suction is provided, one end of which is open to the gas phase portion of the lower water tank, and a gas discharge pipe is provided with the other end opened to the atmosphere, and an overflow pipe is formed to maintain a constant liquid level in the upper water tank. A two-layer structure in which a passage is provided to communicate the liquid phase part of the tank and the lower water tank, and the upper water tank or lower water tank is operated according to changes in the internal pressure in the tank, and the internal pressure in the tank is maintained within a certain range. In the seal pot, as a passage that communicates the inside of the tank with the liquid phase part of the lower water tank, it penetrates the partition plate and opens one end to the gas phase part of the upper water tank, and the other end opens to the liquid phase part of the lower water tank. A gas discharge pipe is provided, and the lower water tank is provided with an overflow discharge port that maintains a constant liquid level in the water tank, and the lower ends of the atmospheric suction communication pipe and the gas communication pipe are adjustable in the vertical direction. A two-layer seal pot featuring an adjustment nozzle.