Gas dissolution liquid manufacturing apparatus

Abstract

The present invention provides a gas dissolution liquid production apparatus that can properly drain condensed water that condenses in the gas phase chamber when generating a gas dissolution liquid in a gas dissolution membrane module, without measuring or adjusting the operating pressure of the gas phase chamber, through a drain pipe. [Solution] The gas dissolution liquid manufacturing apparatus 8 comprises a gas dissolution liquid module 80 and a condensed water discharge mechanism 81. The condensed water discharge mechanism 81 comprises a drain pipe 83 for draining condensed water, a first liquid level sensor 84 provided on the upstream side of the drain pipe 83, a second liquid level sensor 85 provided on the downstream side of the drain pipe 83, an on / off valve 86, and a control unit 88. The control unit 88 performs an open control to open the on / off valve 86 when the first liquid level sensor 84 detects condensed water, and performs a closed control to close the on / off valve 86 when the second liquid level sensor 85 no longer detects condensed water.

Description

Technical Field

[0001] The present invention relates to a gas-dissolved liquid production apparatus provided with a gas dissolution membrane module and a condensate discharge mechanism.

Background Art

[0002] Conventionally, a method has been used in which ozone gas in a pressurized state is dissolved in treated water (for example, pure water) through a gas dissolution membrane (for example, a hollow fiber membrane) to produce ozone water (for example, see Patent Document 1). When producing ozone water using such a gas dissolution membrane, it is common to discharge the condensed water that has condensed in the gas phase chamber of the gas dissolution membrane module to the outside through a drain pipe. However, in that case, in order to prevent the gas in the gas phase chamber of the gas dissolution membrane module from being discharged to the outside through the drain pipe, it is necessary to prevent the condensed water in the drain pipe from running out.

[0003] Therefore, conventionally, in a gas-dissolved water production apparatus provided with a gas dissolution membrane module and a condensate discharge mechanism, when discharging the condensed water that has condensed in the gas phase chamber of the gas dissolution membrane module to the outside, in order to prevent the condensed water in the drain pipe from running out, a technique has been proposed in which the decrease in the operating pressure of the gas phase chamber is set to 5 kPa or less (for example, see Patent Document 2). This conventional gas-dissolved water production apparatus is intended to enable smooth discharge of condensed water with a simple structure.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in conventional gas-dissolved water production systems, it was necessary to measure and adjust the operating pressure of the gas phase chamber of the gas-dissolved membrane module to keep the pressure drop below 5 kPa, in order to prevent the condensed water in the drain pipe from running out. Therefore, there was a need to develop a system that could properly discharge condensed water from the drain pipe with a simpler structure, without having to measure or adjust the operating pressure of the gas phase chamber of the gas-dissolved membrane module.

[0006] The present invention has been made in view of the above problems, and aims to provide a gas dissolution liquid production apparatus that can properly drain condensed water from a drain pipe without measuring or adjusting the operating pressure of the gas phase chamber when generating a gas dissolution liquid in a gas dissolution membrane module. [Means for solving the problem]

[0007] The present invention relates to a gas dissolution liquid production apparatus comprising: a dissolution tank having a gas phase chamber and a liquid phase chamber partitioned by a gas dissolution membrane; a gas dissolution membrane module that generates a gas dissolution liquid by dissolving a raw material gas in a liquid via the gas dissolution membrane; and a condensation water discharge mechanism for draining condensation water that has condensed in the gas phase chamber when the gas dissolution membrane module is generating the gas dissolution liquid, wherein the condensation water discharge mechanism is connected to the dissolution tank and includes a drain pipe for draining the condensation water; a first liquid level sensor provided in the drain pipe; and a position downstream of the first liquid level sensor, The system comprises a second liquid level sensor provided in the drain pipe, an on / off valve provided in the drain pipe at a position downstream of the second liquid level sensor, and a control unit that controls the opening and closing of the on / off valve based on a first detection signal output from the first liquid level sensor and a second detection signal output from the second liquid level sensor. The control unit performs an open control to open the on / off valve when the first liquid level sensor detects the condensed water based on the first detection signal, and performs a closed control to close the on / off valve when the second liquid level sensor no longer detects the condensed water based on the second detection signal.

[0008] In this configuration, when the first liquid level sensor located upstream of the drain pipe detects condensed water, an open control is performed to open the on / off valve, and when the second liquid level sensor located downstream of the drain pipe no longer detects condensed water, a closed control is performed to close the on / off valve. This prevents the drain pipe from becoming completely empty of condensed water, while allowing the condensed water that forms in the gas phase chamber when the gas dissolution membrane module generates the gas solution to be properly drained from the drain pipe. In this case, the condensed water that forms in the gas phase chamber when the gas dissolution membrane module generates the gas solution can be properly drained from the drain pipe without measuring or adjusting the operating pressure of the gas phase chamber.

[0009] Furthermore, in the gas dissolution liquid production apparatus of the present invention, the condensed water discharge mechanism includes a third liquid level sensor provided in the drain pipe at a position downstream of the second liquid level sensor and upstream of the on / off valve, and the control unit may perform the opening control based on the first detection signal when the third liquid level sensor detects the condensed water, based on the third detection signal output from the third liquid level sensor.

[0010] In this configuration, the drain valve is opened only when the third liquid level sensor, located downstream of the second liquid level sensor, detects condensed water. In other words, when the third liquid level sensor does not detect condensed water, the drain valve is not opened. This makes it possible to more reliably prevent the drain pipe from becoming empty of condensed water (i.e., the gas in the gas phase chamber of the gas-dissolved membrane module from being discharged to the outside through the drain pipe).

[0011] Furthermore, in the gas dissolution liquid production apparatus of the present invention, the condensed water discharge mechanism may include a flow rate adjustment unit provided in the drain pipe at a position downstream of the on / off valve, and the flow rate adjustment unit may have the function of adjusting the flow rate of the condensed water discharged from the drain pipe.

[0012] With this configuration, the flow rate adjustment unit located downstream of the on / off valve can appropriately adjust the flow rate of condensed water discharged from the drain pipe (for example, so that the condensed water is discharged gradually from the drain pipe). This prevents the condensed water from being discharged too quickly from the drain pipe when the on / off valve is opened.

[0013] Furthermore, the gas-dissolved liquid production apparatus of the present invention may include a plurality of the gas-dissolved membrane modules, and the drain pipe may branch off at a position upstream of the first liquid level sensor and be connected to the dissolution tanks of the plurality of gas-dissolved liquid modules, respectively.

[0014] With this configuration, even if the drain pipe is connected to the dissolution tank of each of the multiple gas-dissolved membrane modules, the condensed water that has formed in the gas phase chamber of each of the multiple gas-dissolved membrane modules can be properly drained from the drain pipe while preventing the condensed water in the drain pipe from becoming empty.

[0015] Furthermore, in the gas dissolution liquid production apparatus of the present invention, the drain pipe may be provided with a drain storage section having a larger cross-sectional area than the drain pipe at a position downstream of the first liquid level sensor and upstream of the second liquid level sensor.

[0016] This configuration allows for the storage of a larger amount of condensed water (more than what can be stored in the drain pipe) in a drain storage section (which has a larger cross-sectional area than the drain pipe) provided in the drain pipe. Since the drain storage section is located between the first liquid level sensor and the second liquid level sensor, an open control is performed to open the on / off valve when the first liquid level sensor detects condensed water, and a closed control is performed to close the on / off valve when the second liquid level sensor no longer detects condensed water. This prevents the drain pipe from becoming empty of condensed water, while allowing the condensed water that has condensed in the gas phase chamber when the gas dissolution membrane module generates the gas solution to be properly drained from the drain pipe.

[0017] The present invention relates to a method carried out in a gas dissolution solution production apparatus, the gas dissolution solution production apparatus comprising: a dissolution tank having a gas phase chamber and a liquid phase chamber partitioned by a gas dissolution membrane; a gas dissolution membrane module that generates a gas dissolution solution by dissolving a raw material gas in a liquid via the gas dissolution membrane; and a condensation water discharge mechanism for draining condensation water that has condensed in the gas phase chamber when the gas dissolution solution is generated in the gas dissolution membrane module, the condensation water discharge mechanism comprising: a drain pipe connected to the dissolution tank for draining the condensation water; a first liquid level sensor provided in the drain pipe; and a position downstream of the first liquid level sensor, the drain pipe The method comprises a second liquid level sensor provided in the drain pipe, an on / off valve provided in the drain pipe at a position downstream of the second liquid level sensor, and a control unit that controls the opening and closing of the on / off valve based on a first detection signal output from the first liquid level sensor and a second detection signal output from the second liquid level sensor, wherein the control unit performs an open control to open the on / off valve when the first liquid level sensor detects the condensed water based on the first detection signal, and performs a close control to close the on / off valve when the second liquid level sensor no longer detects the condensed water based on the second detection signal.

[0018] This method, as with the system described above, also performs an open control by opening the on / off valve when the first liquid level sensor located upstream of the drain pipe detects condensed water, and a closed control by closing the on / off valve when the second liquid level sensor located downstream of the drain pipe no longer detects condensed water. This prevents the drain pipe from becoming empty of condensed water, while allowing the condensed water that forms in the gas phase chamber when the gas dissolution membrane module generates the gas solution to be properly drained from the drain pipe. In this case, the condensed water that forms in the gas phase chamber when the gas dissolution membrane module generates the gas solution can be properly drained from the drain pipe without measuring or adjusting the operating pressure of the gas phase chamber.

[0019] The present invention is a program executed in a gas dissolution solution production apparatus, the gas dissolution solution production apparatus having a dissolution tank partitioned into a gas phase chamber and a liquid phase chamber by a gas dissolution membrane, a gas dissolution membrane module that dissolves a raw material gas in a liquid via the gas dissolution membrane to produce a gas dissolution solution, and a condensation water discharge mechanism for draining condensation water that has condensed in the gas phase chamber when the gas dissolution solution is produced in the gas dissolution membrane module, the condensation water discharge mechanism being connected to the dissolution tank and comprising a drain pipe for draining the condensation water, a first liquid level sensor provided in the drain pipe, and a position downstream of the first liquid level sensor, The system comprises a second liquid level sensor provided in a water pipe, an on / off valve provided in the drain pipe at a position downstream of the second liquid level sensor, and a control unit that controls the opening and closing of the on / off valve based on a first detection signal output from the first liquid level sensor and a second detection signal output from the second liquid level sensor. The program causes the control unit to perform an open control process based on the first detection signal, which opens the on / off valve when the first liquid level sensor detects the condensed water, and a close control process based on the second detection signal, which closes the on / off valve when the second liquid level sensor no longer detects the condensed water.

[0020] This program, like the system described above, opens the on / off valve when the first liquid level sensor located upstream of the drain pipe detects condensed water, and closes the on / off valve when the second liquid level sensor located downstream of the drain pipe no longer detects condensed water. This prevents the drain pipe from becoming completely empty of condensed water, while allowing the condensed water that forms in the gas phase chamber when the gas dissolution membrane module generates the gas solution to be properly drained from the drain pipe. In this case, the condensed water that forms in the gas phase chamber when the gas dissolution membrane module generates the gas solution can be properly drained from the drain pipe without measuring or adjusting the operating pressure of the gas phase chamber. [Effects of the Invention]

[0021] According to the present invention, when generating a gas-dissolved liquid in a gas dissolution membrane module, condensed water condensed in the gas phase chamber can be appropriately drained from a drain pipe without measuring or adjusting the operating pressure of the gas phase chamber.

Brief Description of the Drawings

[0022] [Figure 1] It is an explanatory drawing showing the overall configuration of an ozone water supply system in an embodiment of the present invention. [Figure 2] It is an explanatory drawing showing an example of a gas-dissolved liquid manufacturing apparatus (ozone water manufacturing apparatus) in an embodiment of the present invention. [Figure 3] It is an explanatory drawing showing another example of a gas-dissolved liquid manufacturing apparatus (ozone water manufacturing apparatus) in an embodiment of the present invention. [Figure 4] It is an explanatory drawing showing another example of a gas-dissolved liquid manufacturing apparatus (ozone water manufacturing apparatus) in an embodiment of the present invention. [Figure 5] It is an explanatory drawing showing another example of a gas-dissolved liquid manufacturing apparatus (ozone water manufacturing apparatus) in an embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0023] Hereinafter, a gas-dissolved liquid manufacturing apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the case of an ozone water manufacturing apparatus used in an ozone water supply system or the like is exemplified. The ozone water manufacturing apparatus of the present embodiment has a function of appropriately draining condensed water condensed in the gas phase chamber from a drain pipe when generating a gas-dissolved liquid in a gas dissolution membrane module. These functions are realized by a program stored in a control unit or the like of the ozone water manufacturing apparatus.

[0024] <Ozone Water Supply System> First, the configuration of the ozone water supply system to which the gas-dissolved liquid production apparatus (ozone water production apparatus) of this embodiment is applied will be described with reference to the drawings. Figure 1 is an explanatory diagram showing the overall configuration of the ozone water supply system. As shown in Figure 1, the ozone water supply system 1 includes a gas supply line 2 to which ozone gas, which is the raw material for ozone water, is supplied, and a liquid supply line 3 to which pure water (DIW), which is the raw material for ozone water, is supplied.

[0025] The gas supply line 2 is supplied with a first gas (e.g., oxygen gas) and a second gas (e.g., carbon dioxide gas, nitrogen gas, or a mixture of carbon dioxide gas and nitrogen gas) which are the raw materials for ozone gas. The gas supply line 2 is equipped with a gas flow regulator 4 and an ozonizer 5. The gas flow regulator 4 adjusts the flow rates of the first gas and the second gas, respectively. The ozonizer 5 generates ozone gas from the raw material gas (a mixture of the first gas and the second gas) by discharge.

[0026] Pure water is supplied to the liquid supply line 3, the flow rate of the pure water is adjusted by the flow rate adjustment valve 6, and the flow rate of the pure water is measured by the flow rate sensor 7. The liquid supply line 3 is connected to the first ozone water production device 8. The ozone water production device 8 is a device that produces ozone water by dissolving ozone gas in pure water via a gas dissolution membrane (such as a hollow fiber membrane). The main components of the ozone water production device 8 will be described later using Figures 2 to 5. The ozone water production device 8 is provided with an exhaust line 9 for exhausting ozone gas, and the exhaust line 9 is equipped with an ozone gas decomposer 10 for decomposing ozone gas and a pressure adjustment valve 11 for adjusting the pressure of the exhausted ozone gas.

[0027] A gas-liquid separator 12 is provided downstream of the first ozone water production device 8, and the first ozone water production device 8 and the gas-liquid separator 12 are connected by a first intermediate line 13. The first intermediate line 13 is equipped with a pressure regulating valve 14 for adjusting the pressure of the ozone water produced by the first ozone water production device 8. The first intermediate line 13 is a line for supplying the ozone water produced by the first ozone water production device 8 to the gas-liquid separator 12.

[0028] In addition to the first intermediate line 13, the gas-liquid separator 12 is connected to a circulation supply line 15 that circulates and supplies unused ozonated water at the point of use. The circulation supply line 15 is equipped with a flow sensor 16 for measuring the flow rate of unused ozonated water at the point of use and a pressure regulating valve 17 for adjusting the pressure of unused ozonated water at the point of use.

[0029] The gas-liquid separator 12 stores ozonated water and is equipped with a water level sensor (not shown) for measuring the water level of the ozonated water. The gas-liquid separator 12 is equipped with an exhaust line 18 for discharging undissolved ozone gas. The exhaust line 18 is equipped with an ozone gas decomposer 19 for decomposing ozone gas and a pressure regulating valve 20 for adjusting the pressure of the exhausted ozone gas.

[0030] A second ozonated water production device 8 is provided downstream of the gas-liquid separator 12. The configuration of the second ozonated water production device 8 is the same as that of the first ozonated water production device 8. The gas-liquid separator 12 and the second ozonated water production device 8 are connected by a second intermediate line 21. The second intermediate line 21 is equipped with a booster pump 22 that increases the pressure of the ozonated water supplied from the gas-liquid separator 12 to the second ozonated water production device 8, and a flow sensor 23 that measures the flow rate of the ozonated water supplied to the second ozonated water production device 8.

[0031] For example, a centrifugal pump, a bellows pump, or a diaphragm pump can be used as the booster pump 22. The parts of the booster pump 22 that come into contact with ozonated water or ozone gas are made of a material that is resistant to ozonated water or ozone gas (for example, fluororesin).

[0032] The second ozone water production device 8 is equipped with an ozone water supply line 24 for supplying ozone water to the use point. The ozone water supply line 24 is equipped with a flow sensor 25 for measuring the flow rate of ozone water supplied to the use point and a pressure sensor 26 for measuring the pressure of ozone water supplied to the use point.

[0033] The ozone water supply line 24 and the liquid supply line 3 are each provided with a discharge line 27 branching off from the ozone water supply line 24 and the liquid supply line 3, respectively, and the discharge line 27 is connected to the circulation supply line 15. The discharge line 27 is equipped with an ozone water concentration meter 28 for measuring the concentration of ozone water. The ozone water concentration meter 28 is equipped with a switching valve (not shown) and can switch between a mode for measuring the zero point of pure water (DIW) and a mode for measuring the concentration of ozone water (it can measure both the zero point and the concentration of ozone water).

[0034] <Ozone water production device> Next, the configuration of the ozone water production apparatus 8 of this embodiment will be described with reference to the drawings. Figure 2 is an explanatory diagram showing an example of the ozone water production apparatus 8 of this embodiment. As shown in Figure 2, the ozone water production apparatus 8 includes a gas dissolution membrane module 80 and a condensed water discharge mechanism 81. The gas dissolution membrane module 80 has a dissolution tank 82 partitioned into a gas phase chamber and a liquid phase chamber by a gas dissolution membrane (for example, a hollow fiber membrane), and is configured to produce ozone water by dissolving a raw material gas (ozone gas) in a liquid (pure water) via the gas dissolution membrane.

[0035] The condensed water discharge mechanism 81 has the function of draining the condensed water that has condensed in the gas phase chamber when ozonated water is generated in the gas dissolution membrane module 80. As shown in Figure 2, the condensed water discharge mechanism 81 includes a drain pipe 83, a first liquid level sensor 84, a second liquid level sensor 85, an on / off valve 86, a flow rate adjustment unit 87, and a control unit 88. The drain pipe 83 is connected to the drain port of the dissolution tank 82 and is configured to drain the condensed water. The first liquid level sensor 84, the second liquid level sensor 85, the on / off valve 86, and the flow rate adjustment unit 87 are located in the drain pipe 83. The second liquid level sensor 85 is located downstream of the first liquid level sensor 84, and the on / off valve 86 is located downstream of the second liquid level sensor 85.

[0036] The control unit 88 receives a first detection signal output from the first liquid level sensor 84 and a second detection signal output from the second liquid level sensor 85. The control unit 88 has the function of controlling the opening and closing of the on / off valve 86 based on the first and second detection signals. Specifically, based on the first detection signal, the control unit 88 opens the on / off valve 86 when the first liquid level sensor 84 detects condensed water, and based on the second detection signal, it closes the on / off valve 86 when the second liquid level sensor 85 no longer detects condensed water.

[0037] The flow rate adjustment unit 87 is located downstream of the on / off valve 86 and has the function of adjusting the flow rate of condensed water discharged from the drain pipe 83. The flow rate adjustment unit 87 may be configured to adjust the flow rate of condensed water by the control unit 88 (for example, when the on / off valve 86 is opened, it may reduce the flow rate of condensed water for a predetermined period of time).

[0038] The flow rate adjustment section 87 can be, for example, a needle valve, ball valve, plug valve, bellows valve, or butterfly valve. The flow rate is determined during the design phase, and a suitable valve is selected. Alternatively, the operator can check the flow rate during installation and adjust the flow rate by manually operating the valve. An orifice or similar device for maintaining a constant flow rate may also be used.

[0039] In this embodiment of the ozone water production apparatus 8, when the first liquid level sensor 84 located upstream of the drain pipe 83 detects condensed water, an open control is performed to open the on / off valve 86, and when the second liquid level sensor 85 located downstream of the drain pipe 83 no longer detects condensed water, a closed control is performed to close the on / off valve 86. This prevents the drain pipe 83 from becoming empty of condensed water, while allowing the condensed water that has formed in the gas phase chamber when ozone water is produced in the gas-dissolved membrane module 80 to be properly drained from the drain pipe 83. In this case, the condensed water that has formed in the gas phase chamber when ozone water is produced in the gas-dissolved membrane module 80 can be properly drained from the drain pipe 83 without measuring or adjusting the operating pressure of the gas phase chamber.

[0040] Furthermore, in this embodiment, the flow rate adjustment unit 87, which is provided downstream of the on / off valve 86, can appropriately adjust the flow rate of condensed water discharged from the drain pipe 83 (for example, so that the condensed water is discharged gradually from the drain pipe 83). This prevents the condensed water from being discharged too quickly from the drain pipe 83 when the on / off valve 86 is opened.

[0041] <Other examples of ozone water production devices> Here, another example of the ozone water production apparatus 8 of this embodiment will be described. Figure 3 is an explanatory diagram showing another example of the ozone water production apparatus 8 of this embodiment. As shown in Figure 3, the condensed water discharge mechanism 81 is equipped with a third liquid level sensor 89. The third liquid level sensor 89 is installed in the drain pipe 83 at a position downstream of the second liquid level sensor 85 and upstream of the on / off valve 86. The control unit 88 receives a third detection signal output from the third liquid level sensor 89. The control unit 88 is configured to perform opening control based on the first detection signal when the third liquid level sensor 89 detects condensed water based on the third detection signal.

[0042] In this case, the open control of the on / off valve 86 of the drain pipe 83 is performed on the condition that the third liquid level sensor 89, which is located downstream of the second liquid level sensor 85, detects condensed water. In other words, when the third liquid level sensor 89 does not detect condensed water, the open control of the on / off valve 86 of the drain pipe 83 is not performed. This makes it possible to more reliably prevent the condensed water in the drain pipe 83 from becoming empty (i.e., the gas in the gas phase chamber of the gas dissolution membrane module 80 from being discharged to the outside from the drain pipe 83).

[0043] Figure 4 is an explanatory diagram showing another example of the ozone water production apparatus 8 of this embodiment. As shown in Figure 4, the ozone water production apparatus 8 is equipped with a plurality of gas-dissolved membrane modules 80. That is, the first ozone water production apparatus 8 is equipped with a plurality of gas-dissolved membrane modules 80. Similarly, the second ozone water production apparatus 8 may also be equipped with a plurality of gas-dissolved membrane modules 80. The drain pipe 83 branches off upstream of the first liquid level sensor 84 and is connected to the dissolution tanks 82 of the plurality of ozone water modules, respectively.

[0044] In this case, even if the drain pipe 83 is connected to the dissolution tank 82 of each of the multiple gas dissolution membrane modules 80, the condensed water that has condensed in each of the gas phase chambers of the multiple gas dissolution membrane modules 80 can be properly drained from the drain pipe 83 while preventing the condensed water in the drain pipe 83 from running out.

[0045] Due to individual differences in the gas-dissolved membrane modules 80 (surface area of ​​hollow fibers, manufacturing tolerances), differences may occur in the amount of condensed water produced in each gas-dissolved membrane module 80. In the configuration shown in Figure 4, these individual differences can be disregarded, and by sharing the drain pipe 83, it is not necessary to install a liquid level sensor for each of the multiple gas-dissolved membrane modules 80, allowing for the drainage of condensed water with a simple configuration.

[0046] Figure 5 is an explanatory diagram showing another example of the ozone water production apparatus 8 of this embodiment. As shown in Figure 5, the drain pipe 83 is equipped with a drain storage section 90 having a larger cross-sectional area than the drain pipe 83 at a position downstream of the first liquid level sensor 84 and upstream of the second liquid level sensor 85.

[0047] In this case, a larger amount of condensed water (more than what is stored in the drain pipe 83) can be stored in the drain storage section 90 (a portion with a larger cross-sectional area than the drain pipe 83) provided in the drain pipe 83. Since the drain storage section 90 is located between the first liquid level sensor 84 and the second liquid level sensor 85, when the first liquid level sensor 84 detects condensed water, it is possible to open the on / off valve 86, and when the second liquid level sensor 85 no longer detects condensed water, it is possible to close the on / off valve 86, thereby preventing the drain pipe 83 from becoming empty of condensed water and allowing the condensed water that has condensed in the gas phase chamber when ozonated water is generated in the gas dissolution membrane module 80 to be properly drained from the drain pipe 83.

[0048] If the ozone water production device 8 is installed in a different location within the ozone water supply system 1, the rate at which condensed water accumulates in the dissolved membrane module 80 may differ. Therefore, if the trigger for draining the condensed water is set by time, it may be necessary to adjust the drainage mechanism each time the installation location or operating conditions change. For example, if the initial drainage time is set to be long, the drainage may continue until the drain is empty when the amount of condensed water decreases. The installation locations for multiple dissolved membrane modules 80 within the ozone water supply system 1 are upstream (ultrapure water side) and downstream (circulation line side) of the gas-liquid separator 12.

[0049] However, with the configuration shown in Figures 1 to 5, the position of the liquid level sensor remains constant regardless of whether the time for condensation water to accumulate is short or long, allowing for flexible adaptation to changes in installation location and operating conditions.

[0050] Although embodiments of the present invention have been described above by example, the scope of the present invention is not limited to these, and modifications and alterations can be made within the scope described in the claims depending on the purpose.

[0051] For example, the above explanation described an example of producing ozonated water by dissolving ozone gas in pure water, but the same method can be used to produce other gas-dissolved solutions. [Industrial applicability]

[0052] As described above, the gas dissolution liquid production apparatus according to the present invention has the effect of being able to properly drain the condensed water that condenses in the gas phase chamber when the gas dissolution liquid is generated in the gas dissolution membrane module, without measuring or adjusting the operating pressure of the gas phase chamber, and is useful for use in applications such as ozone water supply systems. [Explanation of Symbols]

[0053] 1. Ozone water supply system 2 Gas supply line 3. Liquid supply line 4. Gas flow regulator 5 Ozonizer 6. Flow control valve 7 Flow Sensor 8. Ozone water production device (gas-dissolved liquid generation system) 9 Exhaust line 10 Ozone gas decomposers 11 Pressure regulating valve 12 Gas-liquid separator 13. First Intermediate Line 14 Pressure regulating valve 15. Circulation supply line 16 Flow Sensor 17 Pressure regulating valve 18 Exhaust line 19 Ozone gas decomposer 20 Pressure regulating valve 21 Second Intermediate Line 22. Booster pump 23 Flow Sensor 24 Ozone water supply lines 25 Flow Sensor 26 Pressure Sensor 27 Sending Line 28. Ozone water concentration meter 80 Gas-dissolved membrane modules 81 Condensed water discharge mechanism 82 Dissolution tank 83 Drain pipe 84. First liquid level sensor 85. Second liquid level sensor 86 Shut-off valve 87 Flow rate adjustment section 88 Control Unit 89 Third liquid level sensor 90 Drainage storage section

Claims

1. A gas dissolution membrane module having a dissolution tank partitioned into a gas phase chamber and a liquid phase chamber by a gas dissolution membrane, and dissolving a raw material gas in a liquid via the gas dissolution membrane to produce a gas dissolution solution, When generating the gas-dissolved liquid in the gas-dissolved membrane module, a condensation water discharge mechanism is provided for draining the condensed water that has condensed in the gas-phase chamber, A gas dissolution liquid generation system comprising, The aforementioned condensed water discharge mechanism is, A drain pipe connected to the dissolution tank for draining the condensed water, A first liquid level sensor is provided in the drain pipe, A second liquid level sensor is provided in the drain pipe at a position downstream of the first liquid level sensor, A valve is provided in the drain pipe at a position downstream of the second liquid level sensor, A control unit that controls the opening and closing of the on / off valve based on a first detection signal output from the first liquid level sensor and a second detection signal output from the second liquid level sensor, Equipped with, The control unit, Based on the first detection signal, when the first liquid level sensor detects the condensed water, it performs an open control to open the on / off valve. A gas dissolving liquid generation system that, based on the second detection signal, performs closing control to close the on / off valve when the second liquid level sensor no longer detects the condensed water.

2. The condensed water discharge mechanism includes a third liquid level sensor provided in the drain pipe at a position downstream of the second liquid level sensor and upstream of the on / off valve. The gas dissolution liquid manufacturing apparatus according to claim 1, wherein the control unit performs the opening control based on the first detection signal when the third liquid level sensor detects the condensed water, based on the third detection signal output from the third liquid level sensor.

3. The condensed water discharge mechanism includes a flow rate adjustment section provided in the drain pipe at a position downstream of the on / off valve, The gas dissolution liquid manufacturing apparatus according to claim 1, wherein the flow rate adjustment unit has a function to adjust the flow rate of the condensed water discharged from the drain pipe.

4. The system comprises multiple gas dissolution membrane modules, The gas dissolution liquid manufacturing apparatus according to claim 1, wherein the drain pipe branches off at a position upstream of the first liquid level sensor and is connected to the dissolution tanks of the plurality of gas dissolution liquid modules, respectively.

5. The gas dissolution liquid manufacturing apparatus according to claim 1, wherein the drain pipe is provided with a drain storage section having a larger cross-sectional area than the drain pipe at a position downstream of the first liquid level sensor and upstream of the second liquid level sensor.

6. A method performed in a gas dissolution solution production apparatus, The aforementioned gas dissolution liquid manufacturing apparatus, A gas dissolution membrane module having a dissolution tank partitioned into a gas phase chamber and a liquid phase chamber by a gas dissolution membrane, and dissolving a raw material gas in a liquid via the gas dissolution membrane to produce a gas dissolution solution, When generating the gas-dissolved liquid in the gas-dissolved membrane module, a condensation water discharge mechanism is provided for draining the condensed water that has condensed in the gas-phase chamber, Equipped with, The aforementioned condensed water discharge mechanism is, A drain pipe connected to the dissolution tank for draining the condensed water, A first liquid level sensor is provided in the drain pipe, A second liquid level sensor is provided in the drain pipe at a position downstream of the first liquid level sensor, A valve is provided in the drain pipe at a position downstream of the second liquid level sensor, A control unit that controls the opening and closing of the on / off valve based on a first detection signal output from the first liquid level sensor and a second detection signal output from the second liquid level sensor, Equipped with, The above method is such that the control unit Based on the first detection signal, when the first liquid level sensor detects the condensed water, it performs an open control to open the on / off valve. Based on the second detection signal, when the second liquid level sensor no longer detects the condensed water, a closing control is performed to close the on / off valve. Methods that include...

7. A program executed in a gas dissolution solution manufacturing apparatus, The aforementioned gas dissolution liquid manufacturing apparatus, A gas dissolution membrane module having a dissolution tank partitioned into a gas phase chamber and a liquid phase chamber by a gas dissolution membrane, and dissolving a raw material gas in a liquid via the gas dissolution membrane to produce a gas dissolution solution, When generating the gas-dissolved liquid in the gas-dissolved membrane module, a condensation water discharge mechanism is provided for draining the condensed water that has condensed in the gas-phase chamber, Equipped with, The aforementioned condensed water discharge mechanism is, A drain pipe connected to the dissolution tank for draining the condensed water, A first liquid level sensor is provided in the drain pipe, A second liquid level sensor is provided in the drain pipe at a position downstream of the first liquid level sensor, A valve is provided in the drain pipe at a position downstream of the second liquid level sensor, A control unit that controls the opening and closing of the on / off valve based on a first detection signal output from the first liquid level sensor and a second detection signal output from the second liquid level sensor, Equipped with, The program controls the control unit, Based on the first detection signal, the process involves opening the on / off valve when the first liquid level sensor detects the condensed water, and Based on the second detection signal, a process is performed to close the on / off valve when the second liquid level sensor no longer detects the condensed water, A program that executes something.

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