JPH0370534B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a carbon dioxide gas dissolving device that completely dissolves carbon dioxide gas in water under pressurized conditions.

(Prior Art) Carbon dioxide (CO ₂ ) changes its water solubility depending on temperature and pressure. When carbon dioxide gas is discharged into water under pressure, it generates noise at the time of ejection, and depending on the rate of dissolution, bubbles are generated, and as these bubbles rise toward the water surface, they expand and split due to the decompression effect. Noise is generated when bubbles are generated and when they rise, making it unsuitable for use under sound control, which requires a quiet environment. In particular, the noise generated when carbon dioxide gas is discharged into the water from a manned submersible using acoustic measurement equipment has been a long-standing problem, but it has not been solved.

(Problems to be Solved by the Invention) An object of the present invention is to provide a carbon dioxide dissolving device that can dissolve carbon dioxide in water and then discharge it into the water without being affected by acoustic disturbances due to bubble generation and bubble floating. This is the purpose.

(Solution by the Invention) A water inlet pipe for introducing water from outside the manned submersible is provided in the upper part of the carbon dioxide dissolving container, and a carbon dioxide gas introduction pipe for introducing the carbon dioxide generated inside the manned submersible in the lower part of the container. and a water outlet pipe for discharging water in which carbon dioxide gas is dissolved is provided outside the vessel, a porous air diffuser plate communicating with the carbon dioxide gas introduction pipe is provided in a carbon dioxide gas dissolution container filled with water, and The average pore diameter of the air diffuser plate was set to 500μ or less.

(Example) FIG. 1 shows an example of the carbon dioxide dissolving device of the present invention. A carbon dioxide gas dissolving container 1 is provided in the ship, and a porous air diffuser plate 7 that generates fine carbon dioxide gas bubbles is sandwiched between porous air diffuser plate holding flanges 11 in the shape of a sandwich at the bottom of the container to dissolve carbon dioxide gas. It is used as a nozzle. Inside the carbon dioxide gas dissolving container 1 is water 9
The water 9 is introduced into the carbon dioxide gas dissolving container 1 from the inlet pipe 2 by a pump or the like from outside the ship, and after completely dissolving the carbon dioxide gas, the water is introduced into the water outlet pipe 3.
is ejected overboard. Incidentally, a ceramic material, a sintered alloy, a polymer compound, or the like is used for the porous diffuser plate that generates fine carbon dioxide gas bubbles.

On the other hand, carbon dioxide gas is introduced into the porous diffuser plate 7 through the carbon dioxide gas inlet pipe 4 at a pressure higher than the sum of the water pressure and the pressure loss of the porous diffuser plate 7. It is designed to generate fine carbon dioxide gas bubbles 10 and completely dissolve it in water 9.

Figure 2 shows the conditions under which carbon dioxide gas bubbles completely dissolve within 1 m of the rising height of the carbon dioxide gas bubbles in water. According to the test results, the smaller the average pore diameter of the diffuser plate, the more completely the carbon dioxide gas bubbles are dissolved at a lower pressure, and the area where the bubbles are completely dissolved is above the straight line in FIG. For example, when a diffuser plate with an average pore diameter of 10 μm is used, carbon dioxide gas bubbles are completely dissolved at a liquid pressure of 9 kg/cm ² G or more. Further, when a diffuser plate with an average pore diameter of 0.9 μm is used, carbon dioxide gas bubbles are completely dissolved at a liquid pressure of 3 kg/cm ² G or more. Thus, it can be seen that it is desirable to use a diffuser plate with an average pore diameter of 0.9 μm or less in order to completely dissolve the carbon dioxide gas bubbles within a rising height of 1 m.

Next, FIG. 3 shows the relationship between the carbon dioxide gas flow rate per unit area of the diffuser plate and the carbon dioxide gas average bubble diameter. According to this, the average bubble diameter increases as the carbon dioxide flow rate per unit area increases, but if the average bubble diameter is 0.3 mm or less, the carbon dioxide bubbles will completely dissolve within 1 m of the rising height of the carbon dioxide bubbles. I understand that.

Now, based on the results shown in FIGS. 2 and 3, (1) The material of the porous diffuser plate 7 for blowing out carbon dioxide gas is ceramic material, sintered alloy, or polymer compound; The average pore diameter of the air plate was 500μ or less.

(2) Considering the practical size and dimensions of the carbon dioxide dissolving container installed on a submersible, etc., the average pore diameter of the diffuser plate should be 0.9μ in order to completely dissolve the carbon dioxide bubbles within 1 m of rising height. It is preferable to use a porous air diffuser, and it is preferable that the diameter of the fine bubbles ejected from the porous diffuser plate is 0.3 mm or less.

(Effects) The carbon dioxide dissolving device releases carbon dioxide gas into water under pressure from a porous diffuser plate for blowing out carbon dioxide gas with an average pore diameter of 500μ or less, and the released carbon dioxide gas bubbles rise to a height of 1 m. Since the carbon dioxide gas can be completely dissolved in the water, it can be discharged overboard after being dissolved in the water, and there is no adverse effect on the acoustic measuring equipment.

As a result, it is suitable as a carbon dioxide dissolving device for equipment that requires a quiet environment, such as a submarine or a survey ship for seabed exploration.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a carbon dioxide dissolving device according to the present invention. Figure 2 is a graph showing the conditions under which CO ₂ gas dissolves within 1 m. Figure 3 is a graph showing the relationship between CO ₂ gas flow rate and average bubble diameter. In the figure; 1... carbon dioxide gas dissolving container, 2...
Water inlet pipe, 3... Water outlet pipe, 4... Carbon dioxide inlet pipe, 5... O ring, 6... Packing, 7...
Porous air diffuser plate, 8...Packing, 9...Water, 1
0... Carbon dioxide gas bubbles, 11... Porous diffuser plate holding flange, 12... Carbon dioxide gas introduction pipe.

Claims (1)

[Claims] 1. A water inlet pipe for introducing water from outside the manned submersible is installed in the upper part of the carbon dioxide dissolving container, and a carbon dioxide gas introduction pipe for introducing the carbon dioxide generated inside the manned submersible and the water from outside the manned submersible is installed in the lower part of the container. A water outlet pipe for discharging water in which carbon dioxide is dissolved is provided, a porous air diffuser plate communicating with the carbon dioxide gas introduction pipe is provided in a carbon dioxide gas dissolving container filled with water, and an average of the porous air diffuser plate is provided. A carbon dioxide dissolving device for use on a manned submersible, characterized by a pore diameter of 500μ or less.