JP4813944B2 - Saturated gas supply device - Google Patents

Description

  The present invention relates to a saturated gas supply device for supplying a gas having a desired dew point.

  Conventionally, as a saturated gas supply device for supplying a gas having a desired dew point, water is stored in a container, and the gas is discharged into the water while keeping the temperature of the water at a predetermined temperature. A so-called bubbling device is known that generates a saturated gas and discharges the saturated gas from the upper part of the container. In such a saturated gas supply device, by maintaining the temperature of the saturated gas in the container at the same temperature as that of water, a gas having a dew point equal to the temperature of water can be stably supplied.

For example, Patent Document 1 describes a saturated gas supply device that maintains the temperature of water and saturated gas in a container at the same temperature as that of the liquid by immersing the container in a liquid stored in a tank. Has been.
Japanese Patent Laid-Open No. 11-248607

  However, in the saturated gas supply apparatus configured as in Patent Document 1, when changing the gas dew point, it is necessary to change the temperature by heating or cooling the liquid stored in the tank. Since the tank has a large capacity and a large amount of liquid is stored in the tank, it takes a long time to change the temperature of the liquid, and the dew point of the gas cannot be changed in a short time.

  In view of such circumstances, an object of the present invention is to provide a saturated gas supply device capable of changing a gas dew point in a short time.

The invention according to claim 1 generates a saturated gas having a desired temperature in the container by releasing the gas into the water while keeping the temperature of the water stored in the container at a predetermined temperature. A saturated gas supply device capable of supplying gas from an upper portion of the container, covering a portion of the container that contains the saturated gas and containing a liquid therein, and being connected to the jacket, A pipe that forms a circulation path, and the pipe is disposed in the water stored in the container, the heating section capable of heating the liquid, the cooling section capable of cooling the liquid, and the water. And a heat exchanging part for exchanging heat with the liquid, and adjusting the temperature of the liquid in the jacket by the heating part and the cooling part to adjust the temperature of the water to be exchanged with the liquid. Adjustment , Thereby and controlling the dew point of the gas.

  According to a second aspect of the present invention, in the saturated gas supply device according to the first aspect of the present invention, the pipe line generates a water flow that flows downward while swirling around the container to the liquid flowing into the jacket from the pipe line. It is provided so that it may occur.

  The invention according to claim 3 is the saturated gas supply device according to claim 1 or 2, characterized in that a heater for heating water stored in the container is provided in the container. It is.

  According to a fourth aspect of the present invention, in the saturated gas supply device according to the third aspect, the heater and the heat exchanging portion are arranged near the center in the container in a plan view. It is.

  According to a fifth aspect of the present invention, in the saturated gas supply device according to the fourth aspect, a gas discharge port for discharging gas into the container is provided at a lower portion of the portion of the container where water is stored. It is characterized by being.

  The invention according to claim 6 is the saturated gas supply apparatus according to any one of claims 1 to 5, wherein the container is formed in a vertically long shape.

According to the first aspect of the present invention, since the pipe forming the circulation path of the liquid accommodated in the jacket has the heating part and the cooling part, the temperature of the liquid is kept constant at the heating part or the cooling part. Thus, the temperature of the saturated gas contained in the portion covered by the jacket of the container can be maintained at a desired temperature . Therefore, holding the temperature of the pre-Symbol liquid to a predetermined temperature, it is possible to maintain the temperature of the water and the saturated gas in the vessel to a temperature of Nozomu Tokoro, so that it can be stably produced a saturated gas at the desired temperature together comprising, by changing the temperature of the liquid, the temperature of the water and the saturated gas in the container can be changed.

  As described above, according to the present invention, the container is immersed in the liquid stored in the tank by the jacket provided in the portion of the container that stores the saturated gas and the conduit for circulating the liquid stored in the jacket. Therefore, the temperature of the water and the saturated gas in the container can be maintained or changed to a desired temperature with a remarkably small amount of liquid as compared with the configuration for adjusting the temperature. That is, when changing the temperature of the saturated gas, that is, the dew point of the supply gas, the temperature of the liquid can be changed in a relatively short time by the heating unit or cooling unit of the pipe, so that the water in the container and the saturated gas The temperature can be changed in a short time. Therefore, the dew point of the supply gas can be changed in a short time.

  According to the second aspect of the present invention, since the liquid in the jacket generates a water flow that flows downward while swirling around the container, the temperature distribution of the jacket can be kept small. As a result, the temperature control for the saturated gas can be performed satisfactorily, and the accuracy of the dew point control can be improved.

  According to the invention which concerns on Claim 3, since the water stored in a container can be heated directly with a heater, it becomes a structure suitable when supplying gas with a high dew point.

  According to the invention of claim 4, when the water stored in the container at the heater and the heat exchange unit is kept at a room temperature or higher, the water in the container is heated near the center of the container by the heater and the heat exchange unit. However, the part along the wall is naturally cooled. For this reason, the water in a container raise | generates the natural convection which raises near the center in a container, and falls along a wall surface, and can stir the water in a container using this natural convection.

  According to the fifth aspect of the present invention, the gas discharged from the gas discharge port to the lower part in the container is guided to the vicinity of the center in the container in which the heater and the heat exchanging part are disposed by the natural convection of water described above. The heating efficiency of the gas can be increased.

  According to the invention which concerns on Claim 6, since the container is vertically long, the contact time of gas and water can be lengthened, suppressing the quantity of the water stored in a container. Thereby, it becomes possible to cope with a large change in gas flow rate. And since the quantity of the water in a container can be restrained, the temperature of water can be changed in a short time.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1 and FIG. 2, a saturated gas supply device 1 according to an embodiment of the present invention includes a container 2 in which water is stored inside and a saturated gas is stored in an upper portion thereof, and an upper portion of the container 2. A jacket 3 to be installed and a pipe line 4 connected to the jacket 3 are provided. In addition, although illustration is abbreviate | omitted, the heat insulating material is wound by the saturated gas supply apparatus 1 entirely.

  The container 2 is formed in a vertically long shape, and includes a circular cylindrical peripheral wall 22 extending in the vertical direction, a bottom wall 21 that closes an opening below the peripheral wall 22, and an opening above the peripheral wall 22. And a ceiling wall 23 to be closed.

  A gas discharge port 2 a for discharging gas into the container 2 is provided at a position slightly above the lower end of the peripheral wall 22. Connected to the gas discharge port 2a is a gas supply means composed of a pump, piping, etc. (not shown) capable of delivering gas. A supply port 2b that extends upward through the jacket 3 is provided at the approximate center of the ceiling wall 23. Then, when gas is released from the gas supply means into the container 2 through the gas discharge port 2a, saturated gas is generated by passing the gas in water in a bubble state, and the saturated gas is discharged from the supply port 2b. Become so.

  In addition, the container 2 is provided with an automatic water supply mechanism 5 for keeping the amount of water in the container 2 at a predetermined amount (1.8 L in the present embodiment). The automatic water supply mechanism 5 includes a water level confirmation tank 51 that extends in the vertical direction, a liquid phase communication part 52 a that communicates a lower part in the water level confirmation tank 51 and a lower part in the container 2, and an upper part in the water level confirmation tank 51. And a gas phase communication part 52 b that communicates with the upper part in the container 2, so that the water level in the water level confirmation tank 51 matches the water level in the container 2. In addition, an electrostatic capacity type sensor 53 is provided in the water level confirmation tank 51, and a diaphragm type pump 6 is connected to the liquid phase communication portion 52a. The sensor 53 indicates that the water level has dropped. When detected, an appropriate amount of water is automatically sent into the liquid phase communicating portion 52a by the pump 6 so that the amount of water in the container 2 is maintained at a predetermined amount.

  Furthermore, a heater 25 for heating water stored in the container 2 is provided in the container 2. The heater 25 keeps the temperature of water detected by the water temperature detection sensor 71 provided in the container 2 at a predetermined temperature when the dew point is kept constant, and increases the temperature of the water when the dew point rises to raise the dew point. It is formed in a substantially U shape that opens downward, and is fixed to the approximate center of the bottom wall 21.

  The jacket 3 covers the portion of the container 2 that contains the saturated gas above the portion where water is stored. Specifically, the jacket 3 has an annular bottom wall 32 extending radially outward from a position substantially equal to the level of water in the container 2 on the peripheral wall 22 of the container 2, and an upper side from the outer peripheral edge of the bottom wall 32. A circular cylindrical peripheral wall 31 extending in the direction of the wall 2 and a ceiling wall 33 that closes the opening on the upper side of the peripheral wall 31 and opposes the ceiling wall 23 of the container 2. And these walls 31-33 form the sealed space 34 which covers the upper part of the container 2, The liquid is accommodated in this sealed space 34. FIG. In the present embodiment, the amount of liquid stored in the jacket 3 is 3.4L.

  As the liquid, it is preferable to employ water, but it is also possible to employ a liquid other than water.

  The pipe line 4 forms a circulation path for the liquid accommodated in the jacket 3 together with the jacket 3, and one end part 4a is connected to the upper part of the peripheral wall 31 of the jacket 3 and the other end part 4b. Is connected to the lower part of the peripheral wall 31 of the jacket 3. The pipe 4 is provided with a pump 41, and the liquid in the jacket 3 flows out from the other end 4 b by the operation of the pump 41, and after passing through the pipe 4, again from the one end 4 a into the jacket 3. To flow into. In the present embodiment, the discharge amount of the pump 41 is set to 10 L / min. Here, since the amount of the liquid is 3.4 L as described above, the number of circulations of the jacket 3 is 2.9 times / min.

  More specifically, as shown in FIG. 3, the one end 4 a and the other end 4 b of the pipe line 4 are connected to the jacket 3 in a state of facing a tangential direction of a specific circle in the jacket 3 in plan view. For this reason, the liquid that has flowed into the jacket 3 from the one end portion 4 a generates a spiral water flow that flows downward while swirling around the container 2.

  The pipe 4 is provided with a heating unit 42 for heating the liquid on the downstream side of the pump 41, and a cooling unit 43 for cooling the liquid on the upstream side of the pump 41. ing. These heating unit 42 and cooling unit 43 maintain the temperature of the liquid detected by the liquid temperature detection sensor 72 provided in the jacket 3 at the same temperature as the water in the container 2 when the dew point is stable, When the dew point is lowered, the liquid temperature is raised or lowered.

  The heating unit 42 has a configuration in which a heater 42 a is disposed inside the pipe 4.

  The cooling unit 43 is provided in the middle of the pipeline 4, and the first port and the second port are connected to the pipeline 4 and one end is connected to the third port of the three-way valve 43a. A heat exchanger 43d for exchanging heat between the branch passage 43b, the other end of which is connected to a position downstream of the three-way valve 43a of the pipe 4, and the cooling pipe 43c through which chiller water or industrial water flows. have. And the cooling part 43 can adjust the cooling capacity of the said liquid with the opening degree of the 3rd port of the three-way valve 43a.

  Further, the pipe 4 is disposed between the pump 41 and the cooling unit 43 in the water stored in the container 2, and heat exchange for adjusting the temperature of the water to the same temperature as the liquid. A portion 45 is provided.

  The heat exchanging portion 45 is configured such that a portion formed in a substantially U shape in which the pipe line 4 opens downward penetrates the bottom wall 21 into the container 2. As shown in FIG. 4, the heat exchanging part 45 and the heater 25 are arranged so as to form a cross at the center in the container 2 in plan view. The heat exchanging part 45 and the heater 25 are both It is located near the center in the container 2 in plan view.

  The heat exchanging unit 45 exchanges heat between the liquid flowing in the pipe 4 and the water in the container 2, thereby contributing to the stability of the water temperature when the dew point is stable, and the water temperature when the dew point is changed. Play a role to change.

Specifically, in the saturated gas supply device 1 of the present embodiment, the temperature of water in the container 2 is maintained at a predetermined temperature by the heater 25 when the dew point is stable. Further, the temperature of the liquid stored in the jacket 3 by the heating unit 42 or the cooling unit 43 of the pipe line 4 is maintained at the same temperature as the temperature of the water in the container 2, and thereby the portion covered by the jacket 3 of the container 2. The temperature of the saturated gas accommodated in is maintained at a desired temperature. That is, the temperature of the water and the saturated gas in the container 2 is to be kept at a temperature of Nozomu Tokoro, stably produced a saturated gas at the desired temperature. At this time, the heat exchange unit 45 contributes to the stability of the temperature of the water in the container 2.

On the other hand, when the dew point is changed, the temperature of the liquid stored in the jacket 3 is changed by the heating part 42 or the cooling part 43 of the pipe line 4, so that the heat exchange part 45 of the jacket 3 and the pipe line 4 changes the temperature in the container 2. temperature of saturated gas and water is strange notice.

  As described above, in the saturated gas supply device 1 of the present embodiment, the jacket 3 provided in the portion for storing the saturated gas of the container 2 and the conduit 4 for circulating the liquid stored in the jacket 3 Compared with a configuration in which the temperature is adjusted by immersing the container 2 in a liquid stored in the tank, the temperature of water and saturated gas in the container 2 can be changed with a significantly smaller amount of liquid. That is, when the temperature of the saturated gas, that is, the dew point of the supply gas is changed, the temperature of the liquid can be changed in a relatively short time by the heating unit 42 or the cooling unit 43 of the pipe 4. The temperature of water and saturated gas can also be changed in a short time. Therefore, the dew point of the supply gas can be changed in a short time.

  Furthermore, the number of circulations of the jacket 3 is 2.9 times / min, and the discharge amount 10 L / min of the pump 41 is 1.8 L of water in the container 2 and 3.4 L of liquid in the jacket 3. Since it is about twice the total amount of 5.2 L, the temperature controllability is excellent and the temperature stability is good. For example, if the power of the heaters 25 and 42a is set to 1.8 kW, the time required to increase the temperature of the water in the container 2 and the temperature of the liquid stored in the jacket 3 from 25 ° C. to 75 ° C. Is 5.2 kcal / ° C. × 50 ° C. ÷ 1.8 kW ÷ 860 × 60 = 10 min.

  The saturated gas supply device 1 of the present embodiment can change the dew point of the supply gas in such a short time, and thus is used for, for example, a fuel cell evaluation device that requires a change in the dew point in a short time. It is preferred that In addition, in a device using a conventional saturated gas supply device, since the dew point cannot be changed in a short time with the saturated gas supply device alone, a wet gas (saturated) is used to change the dew point in a short time. It is necessary to perform a so-called diversion method in which the dew point is changed by changing the mixing ratio with the saturated gas supplied from the gas supply device. Since the dew point of the supply gas can be changed in a short time with a saturated gas supply device alone, no dry gas is required, and the cost of the device can be reduced.

  Moreover, in the saturated gas supply apparatus 1 of this embodiment, since the liquid in the jacket 3 produces a spiral water flow that flows downward while swirling around the container 2, the temperature distribution of the jacket 3 is reduced. Can be suppressed. As a result, the temperature control for the saturated gas can be performed satisfactorily, and the accuracy of the dew point control can be improved.

  Furthermore, when the water stored in the container 2 by the heater 25 and the heat exchanging unit 45 is kept at room temperature or higher, the water in the container 2 is heated near the center in the container 2 by the heater 25 and the heat exchanging unit 45. However, the part along the peripheral wall 22 is naturally cooled. For this reason, the water in the container 2 causes natural convection that rises near the center in the container 2 and descends along the peripheral wall 22, and the water in the container 2 is agitated using this natural convection. Can do.

  Furthermore, since the gas discharge port 2a for discharging the gas into the container 2 is provided slightly above the lower end of the peripheral wall 22, the gas discharged from the gas discharge port 2a into the container 2 is the above-mentioned. Since the natural convection of the water efficiently leads to the vicinity of the center in the container 2 in which the heater 25 and the heat exchange unit 45 are disposed, the gas heating efficiency can be increased. This effect can be remarkably obtained when the gas flow rate is very small.

  Moreover, since the container 2 is vertically long, the contact time between the gas and water can be increased while suppressing the amount of water stored in the container 2. Thereby, it becomes possible to cope with a large change in gas flow rate (for example, a change in the range of 0.5 to 500 L / min). And since the quantity of the water in the container 2 can be restrained, the temperature of water can be changed in a short time.

  The amount of water stored in the container 2, the amount of liquid stored in the jacket 3, and the discharge amount of the pump 41 are not limited to the values shown in the above embodiment, and other values are selected. It is also possible. However, it is preferable to select the circulation rate of the jacket 3 so that it is 1 time / min or more and 5 times / min or less. This is because if the number of circulations of the jacket 3 is less than 1 time / min, the responsiveness deteriorates, and if it is greater than 5 times / min, it is not economical.

  Moreover, in the said embodiment, although the cooling part 43, the heat exchange part 45, the pump 41, and the heating part 42 are provided in order from the upstream in the pipe line 4, these arrangement | sequences can be changed suitably.

In the above embodiment, the heater 25 is provided in the container 2. However, the heater 25 may be omitted. In this way, the temperature of the saturated gas accommodated in the portion covered by the jacket of the container 2 can be maintained at a desired temperature only by keeping the temperature of the liquid accommodated in the jacket 3 constant. The temperature of the water stored in the inside can be kept at the same temperature as the temperature of the liquid. Therefore, holding the temperature of the liquid to a predetermined temperature, it is possible to maintain the temperature of the water and the saturated gas in the container 2 to a temperature of Nozomu Tokoro, so that it can be stably produced a saturated gas at the desired temperature made with, by changing the temperature of the liquid, the temperature of the water and the saturated gas in the container 2 can be changed. However, when the heater 25 is provided in the container 2 as in the above-described embodiment, water stored in the container 2 can be directly heated by the heater 25, so that a gas with a high dew point is supplied. It becomes the composition suitable for.

  Moreover, as the heating part 42 and the cooling part 43, for example, a part of the pipeline 4 may be branched, and the branched part may be immersed in hot water or cold water, and the configuration thereof can be changed as appropriate.

  Furthermore, the gas discharge port 2a may be configured by, for example, a pipe that extends through the ceiling wall 23 of the container 2 to the lower part in the container 2. Moreover, the supply port 2b for supplying saturated gas to another apparatus etc. should just be provided in the upper part of the container 2, for example, may be provided in the upper part of the surrounding wall 22. FIG.

  In addition, the peripheral wall 22 of the container 2 is preferably a circular cylinder, but may be an elliptic cylinder or a rectangular cylinder with rounded corners.

It is a schematic block diagram of the saturated gas supply apparatus which concerns on one Embodiment of this invention. It is the II-II sectional view taken on the line of FIG. It is a perspective view of the part in which the jacket of the saturated gas supply apparatus was provided. It is a perspective view of a heater and a water temperature adjustment part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Saturated gas supply apparatus 2 Container 2a Gas discharge port 2b Supply port 25 Heater 3 Jacket 4 Circulation path 42 Heating part 43 Cooling part 45 Heat exchange part

Claims (6)

While maintaining the temperature of the water stored in the container at a predetermined temperature, a saturated gas having a desired temperature is generated in the container by discharging the gas into the water, and the saturated gas is supplied from the upper part of the container. Possible saturated gas supply device,
A jacket for covering the portion containing the saturated gas in the container and containing a liquid therein; and a pipe line connected to the jacket to form a circulation path for the liquid;
The pipe line is a heating unit capable of heating the liquid, a cooling unit capable of cooling the liquid, and a heat exchanging unit arranged in water stored in the container to exchange heat between the water and the liquid. And adjusting the temperature of the liquid in the jacket by adjusting the temperature of the liquid in the jacket by the heating unit and the cooling unit, thereby controlling the dew point of the gas A saturated gas supply device.   2. The saturation according to claim 1, wherein the pipe line is provided so that a liquid flowing into the jacket from the pipe line generates a water flow that flows downward while swirling around the container. Gas supply device.   The saturated gas supply apparatus according to claim 1 or 2, wherein a heater for heating water stored in the container is provided in the container.   The saturated gas supply device according to claim 3, wherein the heater and the heat exchange unit are disposed near a center in the container in a plan view.   The saturated gas supply device according to claim 4, wherein a gas discharge port for discharging gas into the container is provided at a lower part of a portion of the container in which water is stored.   The saturated gas supply device according to claim 1, wherein the container is formed in a vertically long shape.

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