JPS62210040A - System for dissolving carbon dioxide - Google Patents

Abstract

PURPOSE:To completely dissolve carbon dioxide and to prevent the generation of noise accompanying with the generation of bubbles by injecting carbon dioxide wherein its pressure is regulated so as to oppose the pressure of seawater as fine bubbles into underwater through a nozzle having a porous film in a submarine boat or the like. CONSTITUTION:After carbon dioxide generated in a closed space is separated and concentrated, it is subjected to pressure regulation in coincidence with the depth of seawater through a regulator 16 for discharged pressure of carbon dioxide and injected into seawater through a nozzle 1 having a porous film. The porous film preferably has many fine holes of about <=0.2mmphi hole diameter and is constituted of a ceramic material, sintered metal and a high polymer compound substance, etc. In case of using this system for dissolving carbon dioxide, the generation of noise due to the generation of bubbles is prevented and therefore this system is extremely available as a device discharging carbon dioxide from a manned submarine boat used with an acoustic apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a carbon dioxide dissolving system using a porous membrane. In particular, the present invention relates to a carbon dioxide dissolving system that efficiently discharges carbon dioxide into water without generating noise.

[Conventional technology] Carbon dioxide (CO+) depends on gas temperature and pressure.

Changes its water solubility. When carbon dioxide gas is released into seawater under pressure, it produces noise when ejected, and depending on its dissolution rate, it generates fine bubbles, and as these bubbles rise toward the water surface, the pressure is reduced. Expands due to effect 1
It splits and generates noise when bubbles are generated and rise, making them unsuitable for sound control systems that require a quiet environment. In particular, when carbon dioxide gas is discharged from a manned submersible that uses diaphragm measurement equipment, or when carbon dioxide gas is discharged into seawater by an attached device to the submersible's air purification system, The noise generated by the road has been a long-standing problem, but it has not been completely solved.

On the other hand, nuclear powered submersibles are equipped with liquid amine carbon dioxide removal equipment, which uses the large power supply capacity generated by the nuclear power equipment to release the carbon dioxide absorbed during the dive into the seawater. You can actually stream it while diving. For this reason, carbon dioxide dissolution treatment is necessary when releasing carbon dioxide into seawater, but there is a conventional device called an "underwater injection disperser" that uses iron grates and metal nets to fragment bubbles. There was information. However, there was no specific information regarding what kind of equipment could be used to completely eliminate air bubbles. In addition, as for other techniques, no means or device for preventing air bubbles has been considered even in devices and instruments 1 that utilize compressed air that are thought to generate air bubbles, such as signal launchers and hydraulic injectors.

On the other hand, regarding carbon dioxide emissions from submersibles, 194
In the 1990s, research was conducted on the diameter of exhaust gas and the state of bubbles, and it was found that [in the case of 30 feet underwater, if the initial gas bubble diameter is 0.32 mm or less, no bubbles will appear on the water surface; The injection disperser has a discharge hole diameter of 1/8
It has been made clear that the

[Problems to be solved by the invention] The present invention solves the problem by using carbon dioxide, which is a gas with high water solubility,
The purpose of the present invention is to provide a carbon dioxide dissolving system that completely dissolves carbon dioxide in seawater under pressurized conditions without generating bubbles. A further object of the present invention is to provide a carbon dioxide gas dissolution system that can create a state in which carbon dioxide gas is completely dissolved by applying a "porous membrane" material to the boundary between the gas side and seawater. (1) The present invention provides a porous membrane nozzle capable of producing fine gas particles that can be completely dissolved in pressurized seawater, and an exhaust gas pressure II.
In combination with the I adjustment mechanism, carbon dioxide dissolution allows carbon dioxide to be released and dissolved into seawater while maintaining optimal exhaust gas pressure conditions and without being affected by acoustic disturbances due to bubble generation and bubble surfacing. The purpose is to provide a system.

Means for Solving Problem C] The present invention provides a carbon dioxide dissolving system for dissolving carbon dioxide in water or seawater, which is characterized by being equipped with a porous membrane nozzle for ejecting carbon dioxide. It is. The porous membrane for ejecting carbon dioxide gas can be manufactured from a ceramic material, a sintered alloy, or a polymer compound. also.

The diameter of the gas particles ejected from the porous membrane for ejecting carbon dioxide gas is
It is suitable that the diameter is 0.2 mmφ or less.

[Effects] Carbon dioxide (Co) is a type of gas with high water solubility, but when released into seawater under pressurized conditions, it usually produces bubbles that rise toward the water surface and When the pressure is reduced, it expands and splits into one, and when bubbles are generated and rise,
It makes a sound and also creates bubbles on the water surface. This noise disturbs environments under acoustic control, such as submarines or survey ships for seabed exploration, which require a quiet environment, so a technology for dissolving and absorbing carbon dioxide gas into such pressurized water is desired.

In order to completely dissolve carbon dioxide gas without generating carbon dioxide gas bubbles in seawater under pressure, the present invention has been developed by placing a "porous membrane" material at the boundary between the gas side and seawater. This is aimed at reducing the diameter of the exhaust gas necessary for dissolving carbon dioxide gas. As a result, gas particles that can be completely dissolved in pressurized seawater are created, and in combination with an exhaust gas pressure adjustment mechanism, there is virtually no bubble generation under optimal exhaust gas pressure conditions, and a carbon dioxide gas discharge device that does not generate noise. We were able to provide the following.

The carbon dioxide dissolving system of the present invention is a new technology that combines the application of a "porous membrane" to reduce the particle size of exhaust gas and an exhaust gas pressure adjustment device suitable for promoting dissolution.

Carbon dioxide gas generated in a closed space underwater, such as a submarine or an underwater survey ship, is concentrated by a device installed inside the ship to remove carbon dioxide gas and reduce the concentration of carbon dioxide gas in the space. The pressure of concentrated carbon dioxide is approximately IKgf
/cm''.Next, the a-path suboxygen gas is pressurized to a constant pressure (i.e., the highest expected pressure for carbon dioxide gas discharge) by a carbon dioxide gas compressor.In one embodiment, the pressurizing force is Maximum 5
It is assumed to be 0Kgf/cn+'G. The carbon dioxide compressor is driven by an electric motor and is mounted on a vibration-proof platform for the purpose of preventing vibration and blocking noise propagated to the hull structure. The pressurized carbon dioxide gas is temporarily stored in a carbon dioxide gas storage device.

The air storage pressure can reach a maximum of 50Kgf/cm"G. The carbon dioxide discharge pressure 'IA'vi device detects the pressure that changes from the depth of the water, and the carbon dioxide gas emitted resists the pressure of seawater. The carbon dioxide gas is pressurized or depressurized to adjust the pressure to be ejected into the seawater.The carbon dioxide gas whose discharge pressure has been adjusted is introduced into the carbon dioxide gas discharge chamber.The part of the carbon dioxide gas discharge chamber that comes into direct contact with the seawater is It is a porous membrane, preferably having a large number of narrow pores with a diameter of 0.2 or less.

Examples of materials constituting the porous membrane include ceramic materials, sintered metals or alloys, and polymer compounds.

JJ
The following is a discussion of the carbon dioxide dissolving system for releasing I.

In the case of current electric propulsion submersibles, the carbon dioxide removal device is generally a liquid amine type carbon dioxide removal device, which is operated in a system that absorbs and processes all the carbon dioxide gas generated during the dive. Carbon dioxide gas is released into the atmosphere in the sea or while a submersible is floating on the surface. However, in other cases 1, for example, a nuclear-powered submersible is equipped with a liquid amine carbon dioxide removal device, but since it has a nuclear power unit, there is a large margin in the power supply capacity for consumption on board. Therefore, the process of releasing carbon dioxide absorbed during the dive can be carried out during the dive. For this reason, carbon dioxide dissolution treatment is required when releasing carbon dioxide into seawater, or in other words, bubble countermeasures are required.

Carbon dioxide gas generated in a closed space surrounded by seawater or water is separated from the ambient air by a carbon dioxide removal means and a-condensed, and the a-path acid gas is discharged outside the closed space. There must be. However, in the case of a submersible, for example, sound control may be used to create a quiet environment in order to avoid adverse effects on the audio equipment used by the ship.

It is necessary to facilitate the discharge of carbon dioxide gas under this acoustic control. In such cases, 2 According to the carbon dioxide dissolving system of the present invention, carbon dioxide gas bubbles are made fine by discharging carbon dioxide gas into seawater or water through a porous membrane, and the fine bubbles are dissolved due to the high solubility of carbon dioxide gas. It easily dissolves in water.

The bubbles disappeared quickly and no v&sound was generated.

The carbon dioxide gas discharged has pressure #A! Approximately 6Kgf/cm' more than that because the device resists pressure due to seawater depth.
G is adjusted to a high pressure. By passing through the porous membrane, the carbon dioxide gas adjusted to the discharge pressure creates a discharge bubble diameter that is most easily dissolved in seawater, and the microbubbles are dissolved and do not become bubbles.

As mentioned above, the diameter of these microbubbles is at most 0.2 mmφ. This is set so that the fine carbon dioxide gas bubbles are dissolved within 1.0 m of the evacuation movement without becoming bubbles in the depth range from 200 m to approximately 500 m. It is something. Like other gases, the higher the pressure, the higher the solubility of carbon dioxide; in other words, the deeper the depth, the larger the volume of carbon dioxide that can dissolve. Therefore, if the depth is 200 m or more, the pore diameter of the porous membrane should be about 0.2 mmφ or less without any problem.

The carbon dioxide dissolving system of the present invention is a device that does not spread unnecessary noise to the surrounding area, and is therefore used in underwater work vessels or submersibles for exploration of underwater oil fields and the like. Specifically, firstly, it is extremely useful as a device for exhausting carbon dioxide gas from manned submersibles that use Sound9 equipment, and secondly, it is extremely useful as an auxiliary device for air purifying devices on submersibles. Next, in the sense that the effect of uniformly dissolving useful gases into liquids can be expected, if bubble generation has a negative impact on the process or product in chemical plants where gaseous substances are dissolved in liquids, Very useful and necessary.

[Examples] Next, an embodiment of the present invention will be described in more detail with respect to the carbon dioxide dissolving system shown in the figure, but the present invention is limited to the following examples unless the gist thereof is changed. isn't it.

FIG. 1 is a schematic sectional view showing a porous membrane nozzle portion of an embodiment of the carbon dioxide dissolving system of the present invention. To explain this, carbon dioxide gas that has been pressurized according to the depth of the seawater is supplied from a supply pipe, through a check valve 5, and from a gate valve 4 to a carbon dioxide discharge chamber 3 that is open in the shape of two cones. The carbon dioxide gas discharge chamber 3 is equipped with a gas ejection nozzle section 1 made of a porous membrane at its tip. This porous membrane nozzle 1 has a cylindrical shape, for example, as shown in FIG. 1, and carbon dioxide gas is ejected mainly from fine holes in the porous membrane at the bottom of the cylindrical shape.

This porous membrane gas dissolving chamber includes a nozzle portion 1 made of a porous membrane. A cylindrical part that reinforces the porous membrane nozzle from the periphery 2.
3. Conically opened carbon dioxide gas discharge chamber that supplies carbon dioxide gas to the porous membrane nozzle. Sealing device 25 that can withstand pressure from seawater, etc.
．． It consists of a gate valve 4, a check valve 5, a seawater pool 9, etc. that stop the backflow of seawater. The cylindrical porous membrane part of the porous membrane nozzle 1 is installed in a seawater pool 9 in a recessed part of the hull, and a grid 21 is installed between the hull and the outside.
The lattice 21 is attached with hinges 22 and bolts 23 and can be opened and closed. The hull.

The high pressure of seawater is blocked by the hull outer structure 7 and the hull internal structure 8. Porous membrane nozzle 1.

The cylindrical part 2, which can be disposed as shown in the figure in the cylindrical part 2 provided between the hull outer plate structure 7 and the hull internal structure 8, has an inner diameter that matches the outer diameter of the carbon dioxide gas discharge chamber 3 and the nozzle, A mechanical backing type water-sealing bag e25 is provided at the inner end as shown in the figure. Carbon dioxide gas is subjected to pressure that resists the pressure of seawater, etc., and is ejected into the seawater through a porous membrane. The carbon dioxide gas forms a large number of bubbles, passes through the grid 21 into the seawater, and dissolves in the seawater while erupting and rising.

Next, FIG. 2 is a schematic perspective view illustrating the entire carbon dioxide dissolving system of the present invention.

The carbon dioxide gas generated on board the ship is separated from the ambient air by a carbon dioxide removal means and a-condensed. This concentrated carbon dioxide gas 11 is transported from the pipe at a pressure of I Kgf/am.
Enters carbon dioxide compressor 12, maximum pressure 50Kgf/cm
'G is pressurized. The carbon dioxide gas compressor 12 is placed on a vibration-proof base plate 14 and fully driven by an electric motor 13 so as not to generate any noise. The concentrated and pressurized carbon dioxide gas is then stored in the carbon dioxide gas accumulator 15 (accumulation pressure: maximum 50 Kgf/cm''G).

27 is a safety valve, and 28 is a pipe leading to a normal carbon dioxide gas overboard discharge port. Reference numeral 26 denotes a drain valve, which discharges moisture accumulated in the carbon dioxide gas accumulator 15 into the ship. When it is necessary to discharge carbon dioxide to the outside, such as during carbon dioxide gas accumulation or during lines 15 to 71, the carbon dioxide is discharged through a carbon dioxide discharge pressure regulator throughout the day, as shown in Figure 1, or as shown in Figure 1. 1. Carbon dioxide gas can be discharged to the outside by the carbon dioxide dissolving system of the present invention. That is, the seawater depth is detected by the depth pressure detection sensor 17, and depending on the detected pressure, the jj2 acid gas is reduced in pressure PA at 16, and the check valve 5. Through the piping equipped with the gate valve 4, the pressure becomes uniform in the carbon dioxide discharge chamber 3, and through the porous membrane nozzle 1, a large number of bubbles are ejected into the seawater as shown by the arrows in the seawater. The foam is quickly absorbed into the water and dissolved. In Figure 1, A indicates inside the ship,
B indicates seawater.

[Effects of the Invention] The carbon dioxide dissolving system of the present invention is equipped with a porous membrane nozzle for ejecting carbon dioxide gas, thereby completely dissolving carbon dioxide gas in pressurized seawater or underwater without generating bubbles. It is something that can be done. Therefore, firstly, a porous membrane material is provided at the interface between the pressurized gas and the pressurized seawater or water;

By combining it with a device that adjusts the exhaust gas pressure,
Capable of discharging and dissolving carbon dioxide gas into seawater or water without generating bubbles under optimal exhaust gas pressure conditions;
Second, by releasing carbon dioxide through a porous membrane, carbon dioxide can be released into seawater or water without making any noise. It is possible to use a manned submersible measurement vessel in seawater or underwater without adversely affecting measurement equipment, etc. Thirdly, in the process of dissolving carbon dioxide gas in a liquid, there is no adverse effect on the process due to the generation of bubbles. The carbon dioxide gas dissolving system of the present invention provides technical effects such as enabling a treatment method that can reduce adverse effects on products.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view showing the configuration of a carbon dioxide gas jetting nozzle in an embodiment of the carbon dioxide dissolving system of the present invention. FIG. 2 is a schematic perspective view showing the overall configuration of the carbon dioxide dissolving system of the present invention. Explanation of symbols of main parts of mouth] 1. Porous membrane nozzle part 28. Carbon dioxide discharge chamber reinforcing cylindrical part 3, carbon dioxide discharge chamber 4, gate valve 5, check valve 6, carbon dioxide 7, 1. Hull outer plate structure; 8. Hull internal structure; 9. Seawater pool; 11. Ficondensed carbon dioxide; 12) Carbon dioxide compressor; 16. Carbon dioxide discharge Pressure regulator A, ..., inside the ship; B, ..., seawater;

Claims (4)

[Claims] (1) In a carbon dioxide dissolving system that dissolves carbon dioxide in water or seawater, carbon dioxide whose pressure is adjusted to resist the pressure at the depth of the water or seawater is ejected into the water or seawater in the form of fine bubbles. A carbon dioxide dissolving system characterized by being equipped with a porous membrane nozzle. (2) The carbon dioxide dissolving system according to claim 1, further comprising a device for adjusting the pressure of the carbon dioxide gas jet in accordance with the pressure in the jet water or seawater. (3) In the carbon dioxide dissolving system according to claim 1 or 2, the porous membrane for the carbon dioxide gas jetting nozzle is made of a ceramic material, a sintered alloy, or a polymer compound. Carbon dioxide dissolution system. (4) The carbon dioxide dissolving system according to claim 1 or 2, characterized in that the gas particle size of the microbubbles ejected from the carbon dioxide gas ejection nozzle porous membrane is 0.2 mmφ or less. Carbon dioxide dissolution system.