JP2013027814A - Gas dissolving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep stably manufacturing gas dissolution liquid that dissolves a sufficient amount of gas to a liquid.SOLUTION: The gas-liquid dissolving device 1 forms a curtain-like water curtain in the container with internal straightening vanes 11-15, and forms a state in which liquid is sandwiched from both sides by gas, contacts each other at a wide area, and falls. Moreover, a power supply unit PS, a liquid level sensor 31, timers T1-T3, relays X1 and X2 or the like are incorporated in a control circuit 60 in a control box 50, and a solenoid valve 32 for gas supply is opened when a liquid level exceeds an upper limit value H1, and is closed when a fixed time has passed after it has become a lower limit H2. In addition, the degassing timer T3 is operated, the relay X2 for degassing is operated during a fixed time, and a solenoid valve 33 for degassing is opened, when it becomes the setting time of the 24 timer T1. At this time, the operation is compulsorily limited as for the relay X1 for gas supply.

Description

  The present invention relates to a gas dissolving apparatus for dissolving a gas in a liquid.

  Conventionally, as a gas dissolving apparatus capable of efficiently dissolving gas in water, as shown in FIG. 7A, gas is supplied into a container body having a sealed space through a supply pipe, and the inside is atmospheric pressure. The gas dissolved in water is stored in the bottom of the container body by pressurizing and supplying water into the container body through the water supply pipe and bringing the gas and liquid into contact with water and gas inside the container body. An apparatus configured to drain water to the outside through a water pipe has been proposed (Patent Document 1). In this apparatus, a structure in which first, second and third flow control plates are installed to flow water in a thin film shape and a waterfall shape in the internal space of the container body is also adopted.

  Further, as shown in FIG. 7B, there is also a proposal of an apparatus provided with blades that allow water to flow down spirally in a similar apparatus (Patent Document 2).

WO2005 / 075503 (FIGS. 1 and 5) JP2008-86896 (FIGS. 1 and 2)

  In these prior art devices, the amount of dissolved gas is increased by increasing the contact area between the gas and the liquid, but it should be improved in order to stably produce a gas-dissolved solution in which the gas is sufficiently dissolved. There was a point.

  Then, this invention was made | formed for the purpose of manufacturing stably the gas solution which melt | dissolved sufficient quantity of gas in the liquid.

In order to achieve the above object, a gas-liquid dissolution apparatus of the present invention comprises a container body in which a gas supply pipe, a gas discharge pipe, a liquid injection pipe, and a liquid discharge pipe are provided, and the gas supply pipe in the container An apparatus for dissolving a predetermined gas component in the gas into the liquid by a pressure difference between the gas and the liquid by maintaining a pressure of the gas supplied from the liquid injection pipe higher than the pressure of the liquid injected from the liquid injection pipe, Furthermore, it is characterized by having the following configuration.
(1-1) The liquid injection pipe is connected to a pump, and is piped so as to discharge liquid to the upper part of the internal space of the container main body by driving the pump. The liquid discharge pipe is a bottom portion of the container main body. Piping to discharge liquid from
(1-2) The gas supply pipe is connected to a gas supply source. When the valve is opened, the gas supply pipe is piped so as to supply gas from the upper part of the internal space of the container body, and the gas discharge pipe is opened. Sometimes piped so as to discharge gas from the upper part of the internal space of the container body.
(1-3) A liquid level sensor for measuring the liquid level in the container body is provided, and the liquid level in the container body is converged to a predetermined height based on the measurement value of the liquid level sensor. And a liquid level control means for opening and closing the valve of the gas supply pipe.
(1-4) It has a determination means which determines whether the density | concentration of the said predetermined gas component in the gas in the said container main body was in the state which fell under the predetermined conditions, and this determination means WHEREIN: When it is determined that the concentration of the predetermined gas component in the gas is lower than a predetermined condition, a gas vent control means for opening the valve of the gas discharge pipe and exchanging the gas in the container body is provided. Be prepared.

  According to the gas-liquid dissolution apparatus of the present invention, the state in which the container body is filled with a sufficient amount of gas to dissolve a predetermined gas component in the liquid is maintained by the liquid level height control means. . Thereby, the dissolution capability of the gas in a liquid is maintained appropriately. The melting of the predetermined gas component here proceeds by a physical phenomenon in which the gas molecules enter the gaps between the liquid molecules by maintaining the inside of the container at (gas pressure)> (liquid pressure). For this reason, other types of gas originally entering the gaps between the liquid molecules escape into the container body. Therefore, in the apparatus of the present invention, when the concentration of a predetermined gas component in the gas in the container body falls below a predetermined condition by the gas venting control means, the valve of the gas discharge pipe is opened to open the container body. Replace the gas inside. Thereby, the predetermined gas component density | concentration in gas is reset to a high state, and gas melt | dissolution can be continued stably.

Here, it is desirable that the gas dissolving apparatus of the present invention further includes the following configuration.
(1-5) A limiting means is provided for preventing the liquid level control means from operating when the degassing control means is operating.

  By providing the configuration (1-5) as well, the limiting means prevents the liquid level control means from operating when the degassing control means is operating. As a result, the replacement of gas can be executed without waste.

In the gas dissolving apparatus of the present invention, more specifically, the configuration (1-4) can be configured as follows.
(2-4) The determination unit is configured as a unit that determines that the concentration of the predetermined gas component in the gas in the container body is lower than a predetermined condition when the operation time set in the timer arrives. To do.

  In this gas-liquid dissolving apparatus, the timing for executing degassing control in a trial operation or the like is set in a timer.

In the gas dissolving apparatus of the present invention, more specifically, the configuration of (1-4) can be configured as follows.
(3-4) When the measurement result by the submerged gas component concentration sensor that measures the concentration of the predetermined gas component in the liquid discharged from the liquid discharge pipe is a predetermined condition, And a means for determining that the concentration of the predetermined gas component in the gas is lower than a predetermined condition.

  In this gas-liquid dissolving apparatus, the degassing control is executed when the measurement result by the submerged gas component concentration sensor is a predetermined condition, for example, when the gas component concentration falls below a predetermined value or when the gas component concentration does not change.

In the gas dissolving apparatus of the present invention, more specifically, the configuration of (1-4) can be configured as follows.
(4-4) When the measurement result by the gas component concentration sensor in the gas that measures the concentration of the predetermined gas component in the gas in the container body is a predetermined condition, the determination means determines that the gas in the container body It is configured as means for determining that the concentration of the predetermined gas component therein is in a state below a predetermined condition.

  In this gas-liquid dissolution apparatus, the measurement result of the gas component concentration sensor in the gas is a predetermined condition, for example, when the concentration of the gas component to be dissolved is below a predetermined value, or the gas component escaped from the liquid by dissolution. Degassing control is executed when the concentration exceeds a predetermined value.

  According to the present invention, a gas-dissolved liquid in which a sufficient amount of gas is dissolved in a liquid can be stably produced.

The gas-liquid dissolving apparatus of Example 1 is shown, (A) is a top view, (B) is a front view, (C) is a right view. It is sectional drawing of the gas-liquid melt | dissolution apparatus of Example 1. FIG. It is a wiring diagram in the control box of the gas-liquid dissolving apparatus of Example 1. FIG. 3 is a flowchart showing an operating state of the gas-liquid dissolving apparatus of Example 1. The characteristic structure of the gas-liquid melt | dissolution apparatus of Example 2 is shown, (A) is a block diagram of a control system, (B) is a flowchart which shows the outline | summary of the arithmetic processing program which a microcomputer performs. The characteristic structure of the gas-liquid dissolution apparatus of Example 3 is shown, (A) is a block diagram of a control system, (B) is a flowchart which shows the outline | summary of the arithmetic processing program which a microcomputer performs. It is explanatory drawing of a prior art.

  DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention will be described based on specific examples shown in the drawings.

  As shown in FIG. 1, the gas-liquid dissolving apparatus 1 of Example 1 includes a container main body 2, a gas supply pipe 3 for supplying gas into the container from the ceiling of the container main body 2, and the container from the ceiling to the container. A gas discharge pipe 4 for discharging the gas, a liquid injection pipe 5 for injecting liquid into the container from the middle side wall in the height direction, and a liquid discharge pipe 6 for discharging the liquid in the container from the bottom. ing. A pipe 7 provided on the opposite side of the liquid discharge pipe 6 is for draining. In the figure, reference numeral 8 denotes a flow sensor for measuring the gas flow rate from the gas supply pipe 3, and reference numeral 9 denotes a pressure sensor for measuring the internal pressure of the container body 2.

  As shown in FIG. 2, the liquid injection tube 5 extends horizontally to the center in the container, then extends vertically upward, and bends upward in the container so as to discharge the liquid toward the top of the container. In addition, a discharge nozzle 5a is provided at the tip. As shown in the figure, the discharge nozzle 5a has a tapered shape that is narrowed so that its diameter decreases toward the tip, and has a structure that increases the discharge pressure. The liquid injection pipe 5 is connected to a pump. This pump uses a pump having a discharge pressure of 0.1 Mpa and a discharge amount of 35 L / min to 5 ton / min depending on the purpose of use of the apparatus. Further, the gas supply pipe 3 is provided with a supply pressure adjusting mechanism that adjusts the supply pressure so that the gas is fed into the container body at 0.2 MPa. As a result, in this embodiment, the gas pressure enters the container with a pressure 0.1 Mpa higher than the liquid pressure, and the liquid level in the container is pushed down.

  Ring-shaped rectifying plates 11, 12, and 13 are attached to the inner wall of the container body 2. The uppermost rectifying plate 11 is attached to substantially the same height as the tip of the discharge nozzle of the liquid injection tube 5 and is composed of an inclined ring inclined obliquely downward. The second height rectifying plate 12 has the same shape as the uppermost rectifying plate 11. On the other hand, the lowermost rectifying plate 13 is a horizontal ring in which the edge of the hole is notched, and the average inner diameter thereof is larger than that of the upper two rectifying plates 11 and 12. Since the upper two rectifying plates 11 and 12 are the upper surfaces that are inclined downward toward the center, floating substances such as algae fragments mixed in the water pumped up from the lake fall down along the slope and rectify. It does not deposit on the plates 11 and 12. The reason why the diameter of the central hole of the lowermost rectifying plate 13 is increased is to prevent the liquid from forming a rod-like liquid curtain. The reason why the edge of the hole of the lowermost current plate 13 is notched is to form a water curtain having a larger area. In addition, when the ring-shaped rectifying plates 11, 12, and 13 protrude from the inner wall surface of the container toward the center, a state in which the liquid does not fall along the wall in the container is also formed.

  Further, in the vertical portion of the liquid injection pipe 5, blade rectifying rectifying plates 14 and 15 are attached between the rectifying plate 11 and the rectifying plate 12 and between the rectifying plate 12 and the rectifying plate 13, respectively. The inclination directions of the blades of the two bladed rectifying plates 14 and 15 are configured to be opposite to each other. Each vane of the vane rectifying plates 14 and 15 is twisted so that the inclination angle increases as it approaches the tip from the root, and is formed like a ship screw. As a result, the horizontal and vertical gaps between the blades gradually increase from the root toward the tip. Due to these structural features, the suspended matter in the liquid is guided to the tip of the blade without falling on the root side of the blade, falls with the liquid, and does not remain deposited on the blade. .

  Due to the action of these rectifying plates 11 to 15, the liquid discharged from the discharge nozzle 5 a of the liquid injection pipe 5 flows along the upper surface of each rectifying plate and falls vertically from the respective edges to create a curtain-like water curtain. While forming, it falls to the bottom of the container body 2. As a result of the formation of this curtain-shaped water curtain, the liquid in the container comes into contact with each other over a wide area in a state of being sandwiched from both sides by a gas whose pressure is higher by 0.03 to 0.1 Mpa than the liquid. The falling state is realized. As a result, the gas having a high pressure enters the gap between the water molecules, and conversely, the gas that has entered the gap between the water molecules is expelled and the gas is replaced.

  As shown in FIG. 1, a vertical tube 21 whose upper and lower sides communicate with each other in the container is installed on the front surface of the container body 2. The vertical tube 21 is provided with a liquid level sensor 31 so that the height of the liquid level in the container can be measured. Further, the vertical tube 21 itself is made of a translucent material, and has a structure in which the liquid level can be roughly confirmed by visual observation.

  The gas supply pipe 3 and the gas discharge pipe 4 are opened and closed by electromagnetic valves 32 and 33, respectively. The gas supply pipe 3 is a pipe for supplying gas into the container from a gas supply source containing a gas to be dissolved in a liquid, such as an oxygen cylinder or a carbon dioxide gas cylinder, and the gas discharge pipe 4 is a gas in the container It is a pipe for releasing to the atmosphere.

  The gas dissolving apparatus 1 according to the first embodiment includes a control box 50 for controlling the open / closed state of the electromagnetic valves 32 and 33.

  As shown in FIG. 3, single-phase 100 to 200 V is introduced into the control box 50 from the input terminals 51 and 52, and power is supplied to the output terminals 53 to 56 that supply driving power to the solenoid valves 32 and 33. Thus, a control circuit 60 for performing valve opening / closing control is provided. The output terminals 53 and 55 are for outputting a drive current to the gas venting solenoid valve 33, and the output terminals 54 and 56 are for outputting a drive current to the gas supply solenoid valve 32. . The control circuit 60 includes a power supply unit PS, a liquid level sensor 31, timers T1 to T3, and relays X1 and X2. The power supply unit PS is for converting the AC power input from the input terminals 51 and 52 into DC 24V. The timer T1 is a 24-hour timer that outputs a signal at a set time. On the other hand, the timers T2 and T3 are of a type that outputs a signal when a set time such as 15 seconds is counted.

  In the control circuit 60, when the measured value of the liquid level sensor 31 exceeds the set value on the upper limit side, the relay X1 is activated to close the contacts P1, P5, P6. As a result, the gas supply solenoid valve 32 is turned on and gas supply from the gas supply source is executed. As a result, the liquid level is pushed down by the gas. When the measured value of the liquid level sensor 31 falls below the lower limit side set value, the timer T2 is activated. When the timer T2 expires, the relay X1 is released, the contacts P1, P5, P6 are opened, and the gas supply solenoid valve 32 is turned off. As a result, when the liquid level exceeds a predetermined upper limit value, gas starts to be supplied, and as a result, the supply of gas is stopped when the liquid level is lowered to a state where the predetermined lower limit value is further undershooted. Thus, control for converging the liquid level within a certain range is automatically executed.

  A 24-hour timer T1 provided between the power supply unit PS and the input terminals 51 and 52 sets a timing at which a gas venting operation described later is executed, for example, once every hour or once every two hours. Is for. From the viewpoint of corresponding to various conditions, for example, it is preferable to use a device whose timing can be set in units of 15 minutes. When this timer T1 is activated, the contact P3 is closed and the degassing timer T3 is activated. The degas timer T3 is timed up in a fixed time such as 15 seconds. While the timer T3 is operating, the degassing relay X2 is operated and the contact P4 is closed. As a result, electric power is supplied to the degassing solenoid valve 31 to open it, and the gas in the container is discharged. On the other hand, when the degassing relay X2 is activated, the operation of the gas supply relay X1 is forcibly restricted, and the contacts P1, P5, and P6 cannot be closed. As a result, even if an operation command to the gas supply relay X1 is output as the liquid level rises as the gas is discharged during the gas venting operation, the operation of the relay X1 is limited. The electromagnetic valve 32 is kept closed.

  The liquid injection pipe 5 draws water from lakes, rivers, tanks, etc. by a pump that is always driven. The liquid discharge pipe 6 is installed so as to constitute a closed cycle for returning water to a lake or the like that has pumped up water, or a one-way cycle for sending water to another lake, river, or tank.

  Next, the flow of gas dissolution processing by the apparatus of the present embodiment will be described. As shown in FIG. 4, the pump is driven to start injecting water pumped from a lake or the like into the container body 2 (S1). At this time, the gas venting solenoid valve 32 is opened manually. When the liquid level height of the vertical tube 21 visually rises to a full state, the solenoid valve 32 for degassing is closed by manual operation and the switch of the control box 50 is turned on (S2). Then, since the liquid level sensor 31 outputs a signal that the upper limit value H1 is exceeded (S3: YES), the gas supply relay X1 is activated and the contacts P1, P5, P6 are closed, and the gas supply Energization of the electromagnetic valve 32 is executed, and gas is supplied from the gas supply source into the container body 2 (S4). As a result, the liquid level is gradually pushed down by supplying a gas having a higher pressure than the liquid into the filled container. When the measured value of the liquid level sensor 31 reaches the set lower limit value H2 (S5: YES), the timer T2 is activated. When the timer T2 expires (S6: YES), the gas supply relay X1 is released and the contacts P1, P5, and P6 are opened. As a result, the inside of the container forms a state where the liquid level is lower than the lower limit value and the gas pressure is higher than atmospheric pressure by 0.05 Mpa to 0.1 Mpa. Due to the pressure difference between the liquid and the gas, gas molecules enter the gaps between the molecules in the liquid. Since the amount of gas in the container does not increase from the time when the gas supply solenoid valve 32 is closed, the liquid level rises as much as it enters the liquid.

  When the measured value of the liquid level sensor 31 reaches the upper limit side H1 again, the gas supply relay X1 is actuated to supply gas into the container body 2, and the liquid level is gradually pushed down to the lower limit value H2. Then, the timer T2 is activated, and when the timer T2 expires, the gas supply is stopped. Thus, in the container, the gas is mixed into the liquid while being converged between the state where the liquid level is lower than the lower limit value H2 by a predetermined amount and the upper limit value H1.

  For example, when purifying water such as lakes and marshes using high-concentration oxygen supplied from a high-pressure oxygen cylinder, this device presses the water curtain from both sides against water that falls as a curtain-like water curtain. Uses to purify the water quality by increasing the oxygen dissolved concentration in water by replacing the gases of nitrogen and oxygen dissolved in water with a pressure difference of 0.05 Mpa to 0.1 Mpa. Can be used. Then, water having an increased dissolved oxygen concentration is generated inside the container body 2 and returned to the lake etc. from the liquid discharge pipe 6 to improve the water quality of the lake etc. The pressure in the container depends on the capacity of the pump and the discharge pressure setting condition of the gas supply pipe 3, and is adjusted within the range of 0.05 Mpa to 0.1 Mpa by adjusting the valve opening of the liquid discharge pipe 6. Adjust and adjust to fit.

  On the other hand, when the 24-hour timer T1 indicates the time indicating the degas timing (S7: YES), the contact P3 is closed and the degas timer T3 is activated (S8). Along with this, the gas discharge relay X2 is operated for a certain period of time, the contact P4 is closed, and the gas supply relay X1 is in an operation-restricted state (S10). As a result, electric power is supplied to the gas venting electromagnetic valve 33 so that the gas discharge pipe 4 is opened, and the gas in the container is discharged. Even if the liquid level rises as the gas is discharged, as a result of the operation restriction of the gas supply relay X1, the gas supply electromagnetic valve 32 is kept closed.

  This state is maintained until the timer T3 expires (S11: NO). When the timer T3 expires (S11: YES), the operation restriction on the gas supply relay X1 is released, and the contact P4 is opened (S12). As a result of the liquid level rising due to the degassing operation, the gas supply relay X1 immediately performs a normal operation, and the gas supply electromagnetic valve 32 is opened.

  The degassing associated with the operation of the 24-hour timer T1 eliminates the state in which the concentration of the replacement target gas (for example, oxygen) in the container has decreased due to the replacement gas (for example, nitrogen) that has escaped from the liquid into the container. Thus, the operation of the apparatus in a state where the concentration of the replacement target gas is high is realized. Further, in this embodiment, since the inside of the container is filled with the gas in the container when the operation is started, the operation can be started in a state where the concentration of the replacement target gas is high. In addition, since the control circuit as shown in FIG. 3 is used in this embodiment, when the 24-hour timer notifies the arrival of the set time in the gas supply condition, the gas supply operation is the operation of the relay X1 by the relay X2. Interrupted by restrictions.

  The gas-liquid dissolution apparatus 1 of the second embodiment has a common configuration in that it includes the same container body and pipe as those of the first embodiment. The feature of this embodiment is that the opening / closing timing of the electromagnetic valves 32 and 33 is controlled not by timer control but by microcomputer control, which is different from the first embodiment, and the control system is configured as shown in FIG. It has become.

  As shown in FIG. 5A, the microcomputer 70 receives detection signals from the liquid level sensor 31 and the oxygen concentration sensor 71 in the water, and issues an operation command to the gas supply solenoid valve 32 and the gas release solenoid valve 33. Is output. Here, the underwater oxygen concentration sensor 71 is installed so as to measure the oxygen concentration of water discharged from the liquid discharge pipe 6.

  The microcomputer 70 of the apparatus according to the second embodiment is configured to execute control processing according to a control program as shown in FIG. In this embodiment as well, during operation, the water pumped up from the lake and the like by the pump is injected into the container body and discharged through the liquid discharge pipe.

  The microcomputer 70 determines whether or not the detection value SH input from the liquid level sensor 31 exceeds a predetermined set value H (S21). When it is determined that the detection value SH exceeds the set value H (S21: YES), a command for causing the gas supply solenoid valve 32 to perform an opening operation is output (S22). This command is continued until the detection value SH of the liquid level falls below the set value H (S23: NO → S22). After the detection value SH of the liquid level is below the set value H (S23: YES), the detection signal SOW from the underwater oxygen concentration sensor 71 is input (S24), and the value is less than the set value OW. It is determined whether or not (S25). When it is determined that the oxygen concentration SOW in water is not smaller than the set value OW (S25: NO), the process returns to S21.

  On the other hand, when it is determined that the oxygen concentration SOW in water is smaller than the set value OW (S25: YES), a command for causing the degassing solenoid valve 33 to perform an opening operation is output (S26). The opening operation command for the degassing solenoid valve 33 is continued until a predetermined time elapses (S27: NO → S26), stopped with the elapse of the predetermined time (S27: YES), and returns to S21.

  By repeating such control processing, the inside of the container main body 2 has a liquid surface height converged around the set value H, and oxygen is maintained in a state where the inside of the container is 0.05 Mpa to 0.1 Mpa higher than the atmospheric pressure. And water are brought into contact with each other, and the gas of nitrogen and the like dissolved in water is replaced with oxygen, so that the concentration of dissolved oxygen in water is increased. On the other hand, as a result of nitrogen in the water escaping into the container and the oxygen concentration in the gas is reduced and the ability to dissolve oxygen is reduced, the amount of oxygen concentration change ΔSOW in the water is reduced. Finally, it becomes difficult to efficiently dissolve oxygen. It is determined in S41 and the subsequent arithmetic processing that this state has been reached, and degassing is performed to return the gas in the container to a state in which the oxygen concentration is sufficiently high. Thereby, the process which raises oxygen concentration in water is performed, without reducing the melt | dissolution capability of oxygen.

  In Example 2, as understood from the flowchart of FIG. 5B, when the gas venting process is started, the process does not return to S31 until the process is completed. Even if the liquid level rises due to degassing, the gas supply solenoid valve 32 is kept closed.

  The gas-liquid dissolution apparatus 1 of the third embodiment is similar to the second embodiment, but includes a gas oxygen concentration sensor 72 that detects the oxygen concentration of the gas in the container as a component device for determining the gas venting timing. The point of use is different.

  The control system is configured as shown in FIG. 6A, and the microcomputer 70 receives detection signals from the liquid level sensor 31 and the oxygen concentration sensor 72 in the gas, and supplies the gas supply solenoid valve 32 and the gas vent. An operation command is output to the electromagnetic valve 33.

  The microcomputer 70 of the apparatus according to the third embodiment is configured to execute control processing according to a control program as shown in FIG. In this embodiment as well, during operation, the water pumped up from the lake and the like by the pump is injected into the container body and discharged through the liquid discharge pipe.

  The microcomputer 70 determines whether or not the detection value SH input from the liquid level sensor 31 has exceeded a predetermined set value H (S31). If it is determined that the detected value SH exceeds the set value H (S31: YES), a command for causing the gas supply solenoid valve 32 to perform an opening operation is output (S32). This command is continued until the liquid level height detection value SH falls below the set value H (S33: NO → S32). After the detection value SH of the liquid level is below the set value H (S33: YES), the detection signal SOG from the oxygen concentration sensor 72 in the gas is input (S34), and the value is the set value OG. It is determined whether it has become smaller (S35). When it is determined that the gas oxygen concentration SOG is not smaller than the set value OG (S35: NO), the process returns to S31.

  On the other hand, when it is determined that the gas oxygen concentration SOG has become smaller than the set value OG (S35: YES), a command for causing the degassing solenoid valve 33 to perform an opening operation is output (S36). . The opening operation command for the degassing solenoid valve 33 is continued until a predetermined time elapses (S37: NO → S36), stopped with the elapse of the predetermined time (S378: YES), and returns to S31.

  By repeating such control processing, the liquid level in the container body 2 is converged to the vicinity of the set value H in the same manner as in the first and second embodiments, and the inside of the container is 0.05 MPa to 0 MPa from the atmospheric pressure. The oxygen and water are brought into contact with each other in a state where the pressure is increased by 1 Mpa, and the gas, such as nitrogen and oxygen, dissolved in the water is replaced, and the dissolved oxygen concentration in the water is increased. On the other hand, when nitrogen in the water escapes into the container and the oxygen concentration in the gas decreases and the oxygen dissolving ability decreases, the gas is released to return the gas in the container to a sufficiently high oxygen concentration. Thereby, the process which raises oxygen concentration in water is performed, without reducing the melt | dissolution capability of oxygen.

  Also in the third embodiment, as understood from the flowchart of FIG. 8, when the degassing process is started, the process does not return to S51 until the process is completed. Even if the liquid level rises due to this, the gas supply solenoid valve 32 is kept closed.

  As mentioned above, although the Example for implementing this invention was described, this invention is not limited to this, The various change in the range which does not deviate from the summary is possible.

  For example, in order to dissolve nitrogen in seawater, a closed cycle in which seawater is circulated between the seaweed culture tank containing seawater and the device of the present invention is configured, and a nitrogen gas cylinder is provided as a gas supply source, and the sensor When using it and determining a gas venting timing, it can also comprise so that nitrogen concentration may be measured.

  It can be used for water purification of lakes and rivers, water quality management of fishery ponds, and water quality management of algae culture tanks.

DESCRIPTION OF SYMBOLS 1 ... Gas-liquid dissolution device 2 ... Container main body 3 ... Gas supply pipe 4 ... Gas discharge pipe 5 ... Liquid injection pipe 5a ... Discharge nozzle 6 ... Liquid discharge pipe 7. ..Drain removal 8 ... Flow sensor 9 ... Pressure sensor 11,12,13 ... Ring-shaped rectifying plate 14,15 ... Band thrust rectifying plate 21 ... Vertical tube 31 ... Liquid level Sensor 32 ... Solenoid valve for gas supply 33 ... Solenoid valve for gas release 50 ... Control box 51, 52 ... Input terminal 53-56 ... Output terminal 60 ... Control circuit 70 ... -Microcomputer 71 ... Underwater oxygen concentration sensor 72 ... Gas oxygen concentration sensor PS ... Power supply unit T1-T3 ... Timer X1, X2 ... Relay P1-P6 ... Contact

Claims (5)

A gas supply pipe, a gas discharge pipe, a liquid injection pipe, and a container body in which the liquid discharge pipe is piped, and the pressure of the gas supplied from the gas supply pipe in the container An apparatus for dissolving a predetermined gas component in a gas into the liquid by a pressure difference between the gas and the liquid by maintaining the pressure higher than the pressure, and further comprising the following configuration: .
(1-1) The liquid injection pipe is connected to a pump, and is piped so as to discharge liquid to the upper part of the internal space of the container main body by driving the pump. The liquid discharge pipe is a bottom portion of the container main body. Piping to discharge liquid from
(1-2) The gas supply pipe is connected to a gas supply source. When the valve is opened, the gas supply pipe is piped so as to supply gas from the upper part of the internal space of the container body, and the gas discharge pipe is opened. Sometimes piped so as to discharge gas from the upper part of the internal space of the container body.
(1-3) A liquid level sensor for measuring the liquid level in the container body is provided, and the liquid level in the container body is converged to a predetermined height based on the measurement value of the liquid level sensor. And a liquid level control means for opening and closing the valve of the gas supply pipe.
(1-4) It has a determination means which determines whether the density | concentration of the said predetermined gas component in the gas in the said container main body was in the state which fell under the predetermined conditions, and this determination means WHEREIN: When it is determined that the concentration of the predetermined gas component in the gas is lower than a predetermined condition, a gas vent control means for opening the valve of the gas discharge pipe and exchanging the gas in the container body is provided. Be prepared. The gas dissolving apparatus according to claim 1, further comprising the following configuration.
(1-5) A limiting means is provided for preventing the liquid level control means from operating when the degassing control means is operating. The gas dissolving apparatus according to claim 1 or 2, further comprising the following configuration.
(2-4) The determination unit is configured as a unit that determines that the concentration of the predetermined gas component in the gas in the container body is lower than a predetermined condition when the operation time set in the timer arrives. To do. The gas dissolving apparatus according to claim 1 or 2, further comprising the following configuration.
(3-4) When the measurement result by the submerged gas component concentration sensor that measures the concentration of the predetermined gas component in the liquid discharged from the liquid discharge pipe is a predetermined condition, And a means for determining that the concentration of the predetermined gas component in the gas is lower than a predetermined condition. The gas dissolving apparatus according to claim 1 or 2, further comprising the following configuration.
(4-4) When the measurement result by the gas component concentration sensor in the gas that measures the concentration of the predetermined gas component in the gas in the container body is a predetermined condition, the determination means determines that the gas in the container body It is configured as means for determining that the concentration of the predetermined gas component therein is in a state below a predetermined condition.

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