JP5559528B2 - Method and apparatus for selective methane gas separation of hot spring water - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a methane gas separation method and apparatus for selectively and safely separating flammable gas such as methane dissolved in hot spring water (hereinafter referred to as methane gas) from hot spring water when pumping hot spring water. The methane gas separated from the hot spring water that has been pumped up is diluted to a concentration that does not explode, allowing the methane gas to diffuse into the atmosphere, suppressing the generation of undesirable hot spring scales as a by-product, and the temperature of the hot spring water. The present invention relates to a methane gas separation method and apparatus capable of reducing the concentration of methane gas in hot spring water from which methane gas has been separated while suppressing the descent to a concentration of less than 0.25 percent by analysis using the headspace method.

In the case of hot springs other than natural springs, the underground hot spring water is pumped up by a pump, and the hot springs supplied to the hot spring facility are used as hot springs. In this way, when the source spring is pumped up, the methane gas dissolved in the source spring under high pressure is pumped together with the source spring, stored in the hot spring storage tank under atmospheric pressure, the water pressure is released, and the methane gas in the source spring Is released spontaneously and separated.
By the way, the volume solubility of methane in water is, for example, approximately 3% within a pressure range of 1 to 100 atm. This means that approximately 3 liters of methane gas is dissolved in 100 liters of hot spring water regardless of whether the pressure applied to the water is 10 atmospheres or more in the ground and normal pressure. When the pressure of 1 liter of methane gas is reduced to 1 atm, the volume will be about 30 liters due to the nature of the gas, so a hot spring such as a 10 atm source that saturates methane gas. When 100 liters of water is pumped and stored in a 1 atm hot spring storage tank, only about 3 liters of hot spring water 100 out of approximately 30 liters of methane gas dissolved in 100 liters of 10 atm hot spring water. Since it does not dissolve in liters, the difference of 27 liters cannot be dissolved in water and is separated.

In this way, in a method in which hot water is stored in a hot spring storage tank under atmospheric pressure, the water pressure is released, and the methane gas that spontaneously releases methane gas in the hot spring water is separated, a considerable amount of methane gas is generated in the hot spring water. The methane gas was released from the hot spring water in the use facility such as the hot water bath, and there was a danger of explosion.
Therefore, the hot spring law has been amended to prevent explosions due to the release of methane gas from hot spring water in facilities such as baths at hot water destinations, and the residual methane gas concentration of hot spring water is an analytical value by the headspace method. , Less than 0.25 percent volume concentration.
In order to make the residual methane gas concentration of the hot spring water less than 0.25 percent volume concentration as analyzed by the headspace method, the methane gas accompanying the hot spring water pumped from the hot spring well must be separated from the hot spring water. Don't be.

Conventionally, the following method has been proposed as a method of separating methane gas accompanying hot spring water such as a source spring from hot spring water. That is, (1) The brine pumped up by the pump is guided to the gas separator and separated into hot spring water and natural gas due to the difference in specific gravity, the natural gas is discarded to the atmosphere, and the hot spring water passes through the filtration device to the hot spring water receiving tank. A natural gas separation system that is sent from a hot spring water receiving tank to each bathing related facility is disclosed (see Patent Document 1). (2) In the primary separator, the hot spring water that has been pumped up is discharged from the nozzle toward the receiving plate at a rapid rate of release, and the gas contained in the hot spring water is expanded by a pressure drop due to pressure release. While colliding with the backing plate, the separation effect is enhanced and separated, and the separated gas is discharged from the upper part of the primary separator, while the hot spring water separated by the primary separator is sent to the secondary separator. The hot water is pumped by an underwater motor and sent to a plurality of separators that separate the dissolved gas by centrifugal force, and the residual gas in the hot spring water is separated, and the hot water is directed horizontally from the top of the secondary separator. A gas separator is disclosed in which the gas discharged from the tube and separated by the secondary separator is discharged from the upper part of the secondary separator. (See Patent Document 2). (3) A spiral tank is provided in the cylindrical tank, and the pumped hot spring water is supplied to the spiral water path from the top of the tank, and the spiral water path is swirled down into the hot spring water by centrifugal force. The cyclone type gas water separator which isolate | separates the gas currently used is disclosed (refer patent document 3). (4) Hot spring water that collides hot water from the nozzle at the top of the primary tank with the baffle installed in front of it, drops it from the baffle plates in multiple stages, separates the gas by those impacts, and separates the gas A gas separator is disclosed in which water falls from a hole in a perforated plate of a cradle, enters a primary compartment, overflows a secondary partition plate, enters a secondary compartment, and discharges dissolved gas. (See Patent Document 4)
JP 2008-285583 A Noto 3150115 Noto 3150656 Noto 3154627

However, in these devices, (1) hot spring water from which methane gas such as a source spring is separated (hereinafter referred to as “hot spring water from which methane gas is separated”) is sprinkled or aerated in the atmosphere. Dissolves in hot spring water, and hot spring components, especially ferrous ions, which are divalent ions in hot spring water, are oxidized to trivalent ferric ions, and ferric hydroxide is produced as the chemical composition changes. Then iron scale occurs. (2) Carbon dioxide dissolved in the hot spring water is also released into the air at the same time as the separation of methane gas, so that hydrogen carbonate ions in the hot spring water are reduced, resulting in a chemical change in the calcium component in the hot spring water. However, when calcium hydrogen carbonate having a relatively high solubility in water is changed to calcium carbonate having a low solubility in water, calcium carbonate is precipitated and a calcium scale is generated. (3) Furthermore, the heat of the hot spring water is released into the air by watering, and the hot water temperature drops, which is a problem.
However, (4) In order to avoid these problems, if the amount of sprinkling or aeration is adjusted, or if the device is sealed, the separation performance of methane gas deteriorates, and the analysis value by the headspace method is 0. It is difficult to remove methane gas to less than 25 percent volume concentration.
The present invention provides a hot spring method without causing undesirable phenomena in conventional methods such as changes in chemical components due to oxidation of hot spring water, generation of calcium scale due to a decrease in bicarbonate ions, and decrease in hot water temperature of hot springs. The objective is to remove methane gas from hot spring water in an amount of less than 0.25 percent volume concentration, as determined by the safety standard headspace method specified.

The present invention is based on the conventional method, while preventing or suppressing problems such as changes in chemical components due to oxidation of hot spring water, generation of calcium scale due to a decrease in bicarbonate ions, and decrease in hot water temperature of hot springs. It is an object of the present invention to provide a method and an apparatus for selectively separating methane gas from hot spring water up to a volume concentration of less than 0.25 percent by analysis based on the safety standard headspace method defined in 1.
That is, the present invention ejects hot spring water from which methane gas is separated at an injection pressure from an injection hole to form a jet of a gas-liquid mixed fluid of the hot spring water and the methane gas of the hot spring water , and the methane gas partial pressure is small. By causing a jet of gas-liquid mixed fluid of the hot spring water and the methane gas of the hot spring water to collide with the hot spring water obtained by separating a part of the methane gas from the hot spring water under the blowing of outside air, with separated by release of methane gas, the hot spring water to separate a portion of the methane gas, by mixing rolling a small outside air of the air of methane gas partial pressure to the hot spring water, a small outside air air bubbles of methane gas partial pressure formed, by contacting the air bubbles and the hot spring water, a portion of the methane gas that dissolves in hot spring water part was separated in the methane gas, smaller the methane gas partial pressure by a difference in the methane gas partial pressure Separated by moving in the gas of the air bubbles, the hot spring water separated by moving a portion of the methane gas in the air bubbles formed in the water flow flowing down in cascading, water flow of the hot spring water, methane content A part of the methane gas dissolved in the hot spring water is brought into contact with the air flow of the outside air having a low pressure and dissolved in the hot spring water due to the difference in the methane gas partial pressure of the water flow of the hot spring water and the air flow of the outside air. moving the flow in the method of separating methane spring water, characterized that you separation. In the present invention, the hot spring water jet from which the methane gas is separated into the hot spring water can be blown through the air of the blown gas blown over the hot spring water surface.
And also, the present invention is provided with a gas outlet at the top, a discharge port of the hot spring water methane is separated at the bottom, blowing a gas inlet for introducing the air blower methane partial pressure is lower outside air of the air on the side It has, and methane gas separation tank provided with a blower of the air gas having an air blowing port of the blower gas inlet on the side inside the lower portion enclosed by the partition wall, provided in the methane gas separation tank, the upper end the opening is formed, overflow wall is provided surrounding the opening, the side wall and the bottom wall portion is formed is sealed, the overflow wall, the outer wall surface of the hot spring water overflowing An impact water tank formed to be transmitted and dropped, and a gas-liquid mixed fluid of the hot spring water and the methane gas of the hot spring water provided above the impact water tank and jetting hot spring water from which methane gas is separated Formed in the shock water tank Having an injection hole for impinging the jet of water, methane gas has a jetting tube spring water to be separated, the bottom of the methane gas separation tank below said impact aquarium hot spring water which methane gas is separated A hot spring drainage part to be gathered is formed, and a lower end part of the partition wall forming the air outlet of the blower part is provided above the liquid surface of the hot spring drainage part, and a lower end part of the partition wall A blast gas passage is formed between the liquid level of the hot spring water falling portion, and the blast gas passage follows an upward air blowing portion provided along the outer wall surface of the wall of the impact water tank. It is in the methane gas separation device of hot spring water characterized by

The saturated volume solubility of methane gas in water at room temperature of 1 atm is approximately 3 percent, but this saturated volume solubility is proportional to the partial pressure of methane gas in the air in contact with water.
Even if a part of the device is open to the atmosphere, the inside of the device is generally partitioned from the outside, and the air inside the device is different from the outside. In particular, since the methane gas is discharged from the hot spring water in the methane gas separation device, the methane gas concentration in the device is higher than the outside. If the methane gas concentration in the air in the apparatus is 50%, the methane gas concentration in the hot spring water is theoretically 1.5%. When the partial pressure of methane gas in the air is small, methane gas is separated from the hot spring water until equilibrium is reached, so the methane gas concentration in the hot spring water can be lowered.

  Separation of methane gas from hot spring water by jetting hot spring water forcibly spontaneously releases methane gas that cannot be dissolved in water due to a pressure drop caused by jetting hot spring water into the atmosphere. On the other hand, the separation of methane gas by equilibrium between the hot spring water and the air in contact with the hot spring water is due to mass transfer between the hot spring water and the air in contact with the hot spring water, and the moving speed of methane becomes a problem. This mass transfer rate is due to the movement of methane at the interface between hot spring water and air and the diffusion of methane that has moved into the air into the air. It is proportional to the difference in the partial pressure of methane and proportional to the difference in the concentration of methane in the air. For this reason, in the existing gas separation device stored in the tank at atmospheric pressure, since the gas-liquid interface is small and methane gas stays in the gas phase of the tank, the difference in partial pressure between the gas phase and the liquid phase becomes small, The movement speed of methane decreases, separation does not proceed, and hot water is distributed to the bathtub with methane gas remaining in the hot spring water, which is a problem.

In the present invention, the methane gas separation device includes an injection pipe, an impact water tank, and a blower. The formation of a jet of hot spring water from which the methane gas is separated by jetting from the jet pipe is the first to spontaneously release methane gas that cannot be dissolved in the hot spring water as the pressure drops according to Henry's first law. It separates methane gas from water.
Further, in the present invention, blowing the hot spring water jet flow from which the methane gas from the injection pipe is separated into the hot spring water in the impact water tank is separated by the difference in partial pressure of methane gas according to Henry's second law. Is. That is, the hot spring water jet flow from the jet pipe is applied to the surface of the hot spring water in the impact water tank, draws in the surrounding air and flows into the hot spring water, forms bubbles of the drawn air, It increases the area of the interface between hot spring water and air. In the present invention, the hot spring water jet flow from which the methane gas from the jet pipe is separated is drawn into the hot spring water by the negative pressure generated at the time of blowing, forming air bubbles, Unlike aeration, pressure is not applied to air to introduce air into hot spring water to form bubbles, so oxygen does not easily dissolve in hot spring water due to pressure. In the case of aeration, the time for air bubbles to rise to the surface due to buoyancy is the contact time between hot spring water and air, whereas in the case of injection, the time for touching the air is shortened by increasing the injection speed. can do.

The jet of hot spring water, from which methane gas is separated, collides with the hot spring water in the impact water tank, impacting the jet of hot spring water and causing the effect of knocking out methane gas. The impact on the jet of hot spring water is not due to the impact plate, but the hot spring water in the impact water tank not only gives impact like an impact plate, but also entrains air by spraying on the water surface, A mixed fluid of air is formed to increase the interface area between the air and the hot spring water, and an impact is generated in all directions of 360 degrees due to a complicated movement of the mixed fluid, so that methane gas is knocked out of the hot spring water.
The formation of this mixed fluid generates bubbles in the hot spring water, but the hot spring water overflows from the impact water tank and falls into a waterfall. . Furthermore, in the present invention, air is blown into the apparatus by a blower to prevent methane gas from staying in the apparatus and introduce an atmosphere with a low partial pressure of methane gas, so that the methane partial pressure in the hot spring water and the air in the tank are reduced. The difference in methane partial pressure is secured, and the equilibrium transfer speed is increased by the concentration gradient.

  In the present invention, the hot spring water in the impact water tank overflows by increasing the amount of the hot spring water in the impact water tank by blowing in the jet stream of the hot spring water from which the methane gas from the injection pipe is separated. Since the hot spring water flows down the outer wall of the aquarium and falls in a waterfall shape, the hot spring water flows down on the outer wall of the impact water tank by forming a water flow of the waterfall, and the air of the blast gas flows on the waterfall surface of the hot spring water. Methane gas can be separated from hot spring water by gas-liquid contact. In this case, the hot spring water forms a waterfall-like hot spring water flow on the outer wall surface of the impact water tank, which increases the contact area with the air. Since it is a gas atmosphere, the partial pressure of methane is much lower than the partial pressure of methane in hot spring water, so that the moving speed of methane in the hot spring water to the air phase can be increased. The purpose of the injection is to increase the area of the interface between the air with a small partial pressure of methane drawn and the hot spring water, and it is not necessary to apply water pressure to the air like aeration. In comparison, oxygen becomes difficult to dissolve in hot spring water.

In the present invention, since the separation of methane gas is performed in a short time, the heat transfer from the blown air to the hot spring water can be minimized, and the scale generation of the hot spring water can be suppressed.
The cause of scale generation is primarily that oxygen gas dissolves in hot spring water, but dissolution of oxygen gas from air can be suppressed by minimizing the contact time. Second, in order to selectively separate methane gas, methane gas receives mutual force due to van der Waals force against water molecules, but it is not a stronger electrical bond by ions such as carbon dioxide gas. Methane gas tends to be more easily separated than carbon dioxide gas, and by reducing the processing time, methane gas can be selectively separated while suppressing separation of carbon dioxide gas.

  In the present invention, a jet of hot spring water from which methane gas is separated is blown into the hot spring water, and air is drawn into the hot spring water to form air bubbles. Therefore, when the jet is blown into the hot spring water, the partial pressure of methane gas in the surrounding air is reduced. By doing so, air bubbles with a small methane gas partial pressure can be formed in the hot spring water, and the difference between the methane gas partial pressure of the hot spring water and the methane gas partial pressure of the air bubbles can be increased to facilitate movement into the air bubbles. Since the methane gas in the hot spring water can be removed from the hot spring water, the methane gas can be quickly separated from the hot spring water and the separation efficiency can be increased. Further, in the present invention, at the stage of forming the hot spring water jet from which the methane gas is separated, the methane gas in the source water is released from the jet, and is dispersed in the form of bubbles in the jet to be mixed with gas and liquid. A fluid is formed, and the gas-liquid mixed fluid is made to collide with hot spring water, and methane gas in the jet is released by the impact. Further, in the present invention, under the blowing of outside air, a hot spring water jet from which methane gas is separated is blown into the hot spring water, and air bubbles are formed in the hot spring water by blowing the jet flow, and the formed air bubbles and Contact the hot spring water, move part of the methane gas dissolved in the hot spring water into the air bubbles and separate it, and overflow the hot spring water from which part of the methane gas dissolved in the hot spring water is separated from the impact water tank Then, a waterfall-shaped water flow is formed, and this water flow is brought into contact with the air flow of the blowing gas, so that the methane gas dissolved in the hot spring water can be moved to the air flow. In the present invention, a jet of hot spring water from which methane gas is separated is jetted toward the surface of the hot spring water while blowing outside air, and the outside air having a small partial pressure of methane gas in contact with the surface of the hot spring water is drawn into the hot spring water. Can be dispersed. As a result, the methane gas in the hot spring water comes into contact with the methane gas partial pressure of the hot spring water and the outside air with a small methane gas partial pressure, so it is separated from the hot spring water due to the difference in the methane gas partial pressure between the hot spring water and the outside air, Since it is quickly removed and carried away by the blowing gas, the methane gas can be separated from the hot spring water quickly and continuously. In the present invention, since the hot spring water jet from which the methane gas is separated is jetted onto the surface of the hot spring water, the temperature difference between the two hot spring waters is small. It can be avoided. Furthermore, in the apparatus of the present invention, an impact water tank is disposed in a gas separation tank having a gas discharge port at the upper part and a hot water outlet having been gas-separated at the lower part, and above the shock water tank. A hot spring water injection nozzle that separates methane gas is arranged, so that a hot spring water jet that separates methane gas is formed, and this jet is jetted toward the surface of the hot spring water to contact the surface of the hot spring water. The work of drawing and dispersing outside air with a small partial pressure of methane gas into the hot spring water is performed with a simple structure in which a shock water tank is arranged in the gas separation tank and a hot spring water injection nozzle is arranged above the shock water tank. In addition, it is easy to strengthen the structure, the operation is simple, the apparatus is easy to clean, and the maintenance work can be reduced.

1 is a schematic side sectional view of a gas separation apparatus according to an embodiment of the present invention.

In the present invention, methane gas means a combustible gas such as methane. In the present invention, the hot spring water from which methane gas is separated refers to a source spring or other hot spring water from which methane gas is separated.
In the present invention, the jet of hot spring water blown into the hot spring water is preferably blown at an injection pressure in the range of 0.07 to 0.3 MPa (megapascal) from the injection hole of the injection pipe, more preferably 0. .1 to 0.2 MPa is preferable and practical. If the water head of the jet injected from the injection hole is smaller than 0.07 MPa, the methane gas concentration in the treated hot spring water tends to increase, and if the water head of the jet injected from the injection hole exceeds 0.3 MPa There is a danger that the tank will be destroyed.
It is preferable that the jet head of the jet pipe adjust the jet head with the diameter of the jet hole and the pressure reducing valve so that the head of the jet jetted from the jet hole is in the range of 0.07 to 0.3 MPa. The distance from the spray tube to the impact water tank is preferably in the range of 30 to 50 centimeters. It has been found that the separation efficiency of methane gas tends to deteriorate even when the distance from the injection pipe to the impact water tank is increased or decreased beyond this range. In addition, when increasing the amount of hot spring water, rather than increasing the diameter of the injection pipe and the size of the impact water tank, the combination of the injection pipe and the impact water tank is increased from 1 set to 2 sets according to the amount of hot spring water, It is preferable to increase the number of sets of combinations of injection pipes and impact water tanks by increasing the size of the methane gas separator main body. A plurality of spray nozzle holes can be provided in one spray pipe. In this case, the nozzle hole diameter and the number of nozzles can be adjusted.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited to the following description and illustration.
FIG. 1 is a schematic side sectional view of a gas separation apparatus according to an embodiment of the present invention.

  In the embodiment shown in FIG. 1, the methane separation device 1 is provided with an exhaust pipe 2 at the top, and the bottom 3 is connected to an inlet (not shown) of methane gas separation hot spring water in a hot spring storage tank. A methane gas separation tank 5 having an outlet 4 for methane gas separation hot spring water is provided. In this example, the methane gas separation tank 5 has an injection nozzle hole 6 in the center, and methane gas connected via a pump to a hot spring water supply tank from which methane gas pumped up from the hot spring well is separated. A hot spring water injection pipe 7 having a hot spring water inlet (none of which are shown) is provided, and an impact water tank 8 is provided below the hot spring water injection pipe 7. The impact water tank 8 has an upper end opened to form an upper end opening 9, and the side 10 and the bottom 3 are sealed. In the present invention, the hot spring water from which the methane gas in the impact water tank 8 is separated overflows the wall part 10 composed of the side wall part and the bottom wall part, and falls on the outer wall surface 11 of the wall part 10 of the impact water tank 8 in a waterfall shape. The mass transfer of methane is performed by the gas-liquid contact with the blowing gas that flows down and rises along the outer wall surface 11. An overflow weir 12 is provided at the upper end of the wall 10 of the opening 9 of the impact water tank 8 so that the hot spring water in the impact water tank 8 can flow down the outer wall surface 11 and fall down in a waterfall shape. Yes. Below the impact water tank 8 of the methane gas separation tank 5, a hot spring water falling part where hot water from which methane gas is separated by gas-liquid contact flows down on the outer wall surface 11 of the impact water tank 8 and collects at the bottom 3. 13 is formed.

In the present embodiment, as shown in Figure 1, the gas separation tank 5, on the right side of the impact water tank 8, and the partition wall portion 15 is formed inside the side wall portion 14 of the methane gas separation tank 5, methane gas separation tank An air blowing portion 16 is formed surrounded by the eight side wall portions 14 and the partition wall portion 15. A blower 17 is connected to the blower unit 16. In this example, air is introduced into the blower unit 16 as blown gas. The lower end portion 18 of the partition wall portion 15 is provided above the liquid surface of the hot spring water falling portion 13 on the bottom portion 3 below the impact water tank 8 of the methane gas separation tank 5. 18 and the liquid level of the hot spring water falling part 13 so that the atmosphere of the blowing gas can pass through the liquid level of the hot spring water falling part 13 while being in contact with the liquid level. 19 is formed. In this example, since the air is blown from the air blower 16, the hot spring water from which the methane gas collected in the hot spring water dropping part 13 is separated is separated from the air flowing through the air blowing gas passage 19 and the methane gas by gas-liquid contact. It can be carried out.
The hot spring water from which the methane gas collected in the hot spring water falling part 13 is separated is sent from the outlet 4 of the methane gas separation tank 5 to a hot spring storage tank (not shown).
In this example, even if methane gas from the hot spring water is released into the gas phase in the methane gas separation tank 8 by gas-liquid contact, the methane gas released from the hot spring water into the gas phase is quickly removed by the blowing gas. Separation of methane gas by gas-liquid contact can be performed quickly.

  In this example, the air is sent to the blower unit 16 by the blower 17 in the methane gas separation tank 5. The air taken in by the blower 16 passes through the lower end 18 of the partition wall 15, is sent to the hot spring drainage unit 13, passes through the blown gas passage 19, and runs along the outer wall 11 of the wall 10 of the impact water tank 8. Then, the air blowing upward portion 20 moves upward, passes through the air blowing exhaust portion 21, and is discharged from the exhaust port 4.

  Since this example is configured as described above, hot spring water from which methane gas is separated, for example, a source spring, is sent from a hot spring well to a hot spring water injection pipe 7 via a pump (none of which is shown) and injected. It is injected from the nozzle 6 to the impact water tank 8 through the injection nozzle hole 6 of the hot spring water injection pipe 7. By this injection, the pressure of the hot spring water is released under atmospheric pressure and reduced to atmospheric pressure. The methane gas that cannot be dissolved by this pressure drop is spontaneously released and separated, and the remaining methane gas forms hot spring water and gas-liquid mixed fluid in the jet. A jet stream (jet stream) of hot spring water (for example, a source spring) from which methane gas is separated is jetted from the upper end opening 9 of the impact water tank 8 toward the hot spring water of the impact water tank 8 from the jet nozzle hole 6. When the jet of hot spring water from which the methane gas is separated collides with the hot spring water in the impact water tank 8, an impact is given to the gas-liquid mixed fluid of methane gas in the hot spring water from which the methane gas is separated, and the methane gas in the source spring is struck. At the same time, air bubbles are formed in the hot spring water and the hot spring water from which the methane gas is separated, and a gas-liquid mixed fluid composed of the hot spring water and the air bubbles of the outside air is formed in the hot spring water. Due to the difference between the methane gas partial pressure of the air in the bubble and the methane gas partial pressure of the hot spring water, the methane gas in the hot spring water moves into the air bubbles and a part of the methane gas in the hot spring water Are further separated.

  Moreover, in this example, this hot spring water is partly separated from the hot spring water in the impact water tank 8 by the hot spring water from which the methane gas continuously injected from the injection pipe 7 is separated. Part of it is filled with separated hot spring water. The hot spring water from which part of the methane gas that has filled the impact water tank 8 is separated overflows or overflows the overflow weir 12 on the outer wall surface 11 of the wall 10 of the impact water tank 8, and flows into the air blower section while falling or falling. 16 is brought into contact with the blast gas flowing through the blast gas upward passage 20 through the blast gas passage 19, and the difference between the methane gas partial pressure of the blast gas having a small methane gas partial pressure and the methane gas partial pressure of the hot spring water The methane gas in the water moves to the blowing gas and is separated. Moreover, the hot spring water which flows over and flows down the outer wall surface 11 from the upper part is separated from the air containing methane gas when falling.

In this way, the hot spring water from which the methane gas has been separated flows down on the outer wall surface 11 of the wall 10 of the impact water tank 8 in a waterfall shape and comes into contact with the blowing gas flowing upward through the blowing upward portion 20, and the blowing gas The methane gas is further separated by the difference between the methane partial pressure of the water and the methane partial pressure of the hot spring water, and is sent from the hot spring water falling part 13 to the hot spring storage tank 4 through the hot spring treated water discharge pipe 4 to be stored. The piping from the hot spring treated water discharge pipe 4 to the hot spring storage tank is sealed to prevent air from flowing from the hot spring water falling part 13 to the hot spring treated water discharge pipe 4.
The hot spring water flowing down on the outer wall surface 11 in a waterfall shape is struck to the bottom 3 of the gas separation tank 5 at the lower part of the hot spring water falling part 13 and further receives an impact to separate methane gas.

The air in the methane gas separation device 5 containing methane gas is discharged from the exhaust outlet 4 from the blower discharge part 21 through the air blowing upward part 20 from the hot spring water falling part 13 by the air blown from the blower 17. Separation is facilitated by minimizing the partial pressure of methane gas in the apparatus by this blown gas.
The hot spring water from which the methane gas has been separated flows down on the outer wall surface 11 in a waterfall shape, and is stored in the hot spring storage tank from the hot spring water falling portion 13 by the hot spring treated water discharge pipe 4.
The hot spring water fed to the gas separation device 5 is processed at an average speed of about 1 to 2 seconds, and methane gas is selectively separated.

It is possible to install a silencer for suppressing sound caused by injection or a white smoke preventer for preventing white smoke generated when exhaust is discharged to the outside air in accordance with the environment to be installed in actual use.
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According to the present invention, an analysis value according to the safety standard headspace method stipulated in the revised hot spring law that came into effect on October 1, 2008, methane gas in an amount of less than 0.25 percent volume concentration, Hot spring water that is selectively separated from the water can be obtained, which can contribute to improving the safety of hot spring facilities. In addition, an impact water tank is disposed in the gas separation tank, and a hot spring water jet nozzle is disposed above the impact water tank. The structure is easy to strengthen and the operation is also simple. In addition, the apparatus can be easily cleaned and the maintenance work can be reduced.
Therefore, the present invention can realize the safe use of hot springs, and can suppress changes in spring quality so as not to impair the comfort of hot springs. The usability is great.

DESCRIPTION OF SYMBOLS 1 Methane gas separation apparatus 2 Exhaust pipe 3 Bottom part 4 Outlet of hot spring water from which methane gas was separated 5 Methane gas separation tank 6 Injection nozzle hole 7 Hot spring water injection pipe 8 Impact water tank 9 Upper end opening 10 of impact water tank 8 Upper end opening 9 Side wall portion 11 Outer wall portion 12 of impact water tank 8 Overflow weir 13 Hot spring drainage portion 14 Side wall portion 15 of methane gas separation device 1 Partition portion 16 Blower portion 17 Blower 18 Lower end portion 19 of partition portion 15 Blowing gas passage 20 Blower upward portion 21 Blower exhaust

Claims (2)

The hot spring water from which the methane gas is separated is ejected from the injection hole at an injection pressure to form a jet of a gas-liquid mixed fluid of the hot spring water and the methane gas of the hot spring water. In addition, the methane gas in the jet is released and separated by causing a jet of a gas-liquid mixed fluid of the hot spring water and the methane gas of the hot spring water to collide with the hot spring water obtained by separating a part of the methane gas from the hot spring water. while, in the hot spring water to separate a portion of the methane gas, by mixing rolling a small outside air of the air of methane gas partial pressure to the hot spring water, to form a small outside air air bubbles of methane gas partial pressure, the air bubbles and by contacting the hot spring water, a portion of the methane gas that dissolves in hot spring water part was separated in the methane gas, the difference between the methane partial pressure during air bubbles smaller outside air of the methane gas partial pressure By moving separate, move a portion of the methane gas in the air bubbles formed in the water flow flowing down the hot spring water separated by the cascading, water flow of the hot spring water, a small fresh air of the air of methane gas partial pressure A part of the methane gas dissolved in the hot spring water is moved to the outside air stream having a small partial pressure of the methane gas and separated due to a difference in partial pressure of methane gas between the water stream of the hot spring water and the air flow of the outside air. method of separating methane gas of hot spring water and said to Rukoto. The upper part is equipped with a gas outlet, the lower part is provided with a hot spring water outlet from which methane gas is separated, the side part has a blast gas inlet part for introducing outside air with a small methane gas partial pressure by a blower , and the side part methane gas separation tank provided with a blower of the air gas having an air blowing port of the blower gas inlet inside the lower portion enclosed by the partition wall, provided in the methane gas separation tank, an opening is formed in the upper end portion, overflow wall is provided surrounding the opening, the side wall and the bottom wall portion is formed is sealed, formed the overflow wall, so as to flow down transmitted the outer wall surface of the hot spring water overflowing An impact water tank, and an upper part of the impact water tank, injecting hot spring water from which methane gas is separated to form a jet of a gas-liquid mixed fluid of the hot spring water and the methane gas of the hot spring water, The jets collide with the hot spring water in the impact tank. Having that injection hole, methane gas has a jetting tube spring water to be separated, the the bottom of the methane gas separation tank below the impact aquarium, spring water drainage portions that methane gas is separated hot spring water is collected The lower end portion of the partition wall that forms the air outlet of the air blowing portion is provided above the liquid surface of the hot spring water drainage portion with an interval between the lower end portion of the partition wall and the hot spring water drainage portion. A blast gas passage is formed between the liquid surface, and the blast gas passage continues to an upward air blowing portion provided along the outer wall surface of the wall of the impact water tank. Methane gas separator for hot spring water.

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