JP2015177560A - Hydrogen gas dryer and rotary electric machine system comprising the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hydrogen gas dryer capable of preventing firing and explosion caused by hydrogen gas leak by using no electric heater and implementing an airtight circuit configuration in which a hydrogen gas does not exit externally, and a rotary electric machine system comprising the dryer.SOLUTION: A desiccant regenerative circuit for performing vacuum drying using a heating tube 4 provided in a drying tower 2 implements an airtight circuit configuration for preventing a hydrogen gas from exiting externally. High temperature oil discharged from an airtight oil pump 23 added to a rotary electric machine 20 is used as a heating fluid circulating in the heating tube 4. A vacuum tank 24 and a vacuum pump 25 provided in an oil supply apparatus added to the rotary electric machine 20 is used as vacuum drawing means. Thereby, a hydrogen gas dryer which has a simple configuration and high safety and to which a simple control method can be applied, and a rotary electric machine system comprising the hydrogen gas dryer are obtained.

Description

  The present invention relates to a hydrogen gas drying device that circulates and dehumidifies hydrogen gas for cooling a device to be cooled such as a rotating electrical machine, and a rotating electrical machine system including the same.

  2. Description of the Related Art Conventionally, a hydrogen gas drying device for cooling equipment to be cooled, such as a rotating electrical machine, circulates hydrogen gas outside the apparatus by a pressure difference between an inlet side and an outlet side of a fan installed in a rotor of the rotating electrical machine. Dehumidification was performed with a desiccant filled in Also, when the desiccant absorbs moisture above a certain level, after isolating the hydrogen gas drying device from the line, the electric heater installed inside the drying tower is started and air from the blower installed outside is sent to the desiccant. Water was removed (see FIG. 2).

  As an improvement example of this type of hydrogen gas drying apparatus, in Patent Document 1, it is efficient in a short time by evacuating the inside of the drying tower together with heating by an electric heater installed inside the drying tower. To perform proper dehumidification. Moreover, in patent document 2, each valve, such as a hydrogen gas inlet valve, a hydrogen gas outlet valve, a vacuum drawing valve, and a drain valve, can be remotely controlled by an automatic valve control device, thereby reducing an operator's workload. .

  Furthermore, in Patent Document 3, when the hydrogen gas detector detects hydrogen gas by automating the switching operation of each valve, one of the automatic valves has a hydrogen gas leak by stopping the drying operation and the regeneration operation. Sometimes, the hydrogen gas drying device is not operated.

JP 61-54841 A JP-A 64-77445 Japanese Patent Laid-Open No. 08-331808

  In the above Patent Documents 1 to 3, since all of them are provided with an electric heater for heating the desiccant, and the desiccant is installed in a circuit through which hydrogen gas passes, consideration for explosion prevention is indispensable. For this reason, the operation is performed so that the opening and closing timing of the isolation valve is shifted so that the hydrogen gas does not come into contact with the heated heater, the hydrogen gas remaining in the drying tower is purged with an inert gas, or the inside of the drying tower is evacuated. I was taking measures such as.

  Furthermore, even if the valve switching operation is automated, it is necessary to establish the switching timing of each valve in consideration of explosion prevention, to confirm the completion of switching of each valve, or to monitor the internal temperature of the drying tower, and the system becomes complicated. Therefore, there is a problem that the control system becomes complicated.

  Further, since there is a risk of ignition even with a small amount of hydrogen gas, it is desired for safety management that it does not flow into the surrounding atmosphere. However, in the conventional hydrogen gas drying apparatus as shown in FIG. As a result, the surrounding air is sent to the drying tower, so that hydrogen gas existing with pressure in the drying tower sometimes flows out from the blower when the interlocking switching valve is operated.

  The present invention has been made in order to solve the above-described problems, and realizes a closed circuit configuration in which hydrogen gas does not flow out without using an electric heater, and prevents ignition and explosion due to hydrogen gas leakage. An object of the present invention is to obtain a hydrogen gas drying apparatus that can prevent and apply a simple control method, and a rotating electrical machine system including the same.

  A gas drying apparatus according to the present invention is a hydrogen gas drying apparatus that dehumidifies the cooling hydrogen gas of a cooled device such as a rotating electrical machine outside the apparatus, and includes a heating pipe that allows a heated fluid that passes at least the ambient temperature to pass therethrough. Two drying towers filled with a desiccant between the heating tube and the outer container, and hydrogen gas is guided to one of the drying towers using the differential pressure due to the blower in the rotating electrical machine. A hydrogen gas circulation circuit that passes it back into the rotating electrical machine, and a desiccant regeneration circuit that evacuates the other drying tower by a vacuuming means and heats it by a heating tube to remove moisture absorbed in the desiccant. And a heating fluid circulation circuit that circulates the heated fluid in the heating pipe, a switching valve that selects a drying tower that serves as a hydrogen gas circulation circuit, and a switching valve that selects a drying tower that serves as a desiccant regeneration circuit Means are provided.

  In addition, a rotating electrical machine system according to the present invention includes a rotating electrical machine and a hydrogen gas drying device that circulates and dehumidifies the cooling hydrogen gas of the cooled equipment of the rotating electrical machine outside the device, and the hydrogen gas drying device described above is used as the hydrogen gas drying device. A gas drying apparatus is used.

  According to the hydrogen gas drying apparatus and the rotating electrical machine system of the present invention, vacuum drying using a heating tube is performed in a desiccant regeneration circuit without using a heat source that may be ignited such as an electric heater. Furthermore, since a closed circuit configuration in which hydrogen gas does not flow out is realized, ignition and explosion due to hydrogen gas leakage can be prevented, and a simple control method can be applied.

It is a figure which shows the system | strain of the two-column type gas drying apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the system | strain of the conventional hydrogen gas drying apparatus. It is a figure which shows the effect of the vacuum drying by the two-column type gas drying apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the drying tower in the two-column type gas drying apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the other example of the drying tower in the two-column type gas drying apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the other example of the drying tower in the two-column type gas drying apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the system | strain of the double tower type gas drying apparatus which concerns on Embodiment 3 of this invention. It is a figure which shows the system | strain of the two-column type gas drying apparatus which concerns on Embodiment 4 of this invention. It is a figure which shows the system | strain of the two-column type gas drying apparatus which concerns on Embodiment 5 of this invention. It is a figure which shows the system | strain of the two-column type gas drying apparatus which concerns on Embodiment 6 of this invention. It is a figure which shows the system | strain of the two-column type gas drying apparatus which concerns on Embodiment 7 of this invention. It is a figure which shows the system | strain of the two-column type gas drying apparatus which concerns on Embodiment 8 of this invention. It is a figure which shows the system | strain of the two-column type gas drying apparatus which concerns on Embodiment 9 of this invention.

Embodiment 1 FIG.
Below, the hydrogen gas drying apparatus which concerns on Embodiment 1 of this invention is demonstrated based on drawing. FIG. 1 shows a main part of a two-column gas drying apparatus that is a hydrogen gas drying apparatus of a rotating electrical machine system according to Embodiment 1 of the present invention. In the following drawings, the white triangles indicating the valves indicate the “open” state, the black triangles indicate the “closed” state, and the arrow A indicates the outdoor exhaust.

  The two-column gas drying apparatus 1 has two drying towers 2a and 2b (generally called a drying tower 2), one of these drying towers 2 constitutes a hydrogen gas circulation circuit, and the other is a desiccant regeneration circuit. Configure. The hydrogen gas circulation circuit guides the hydrogen gas to one drying tower 2 (drying tower 2b in FIG. 1) by using the differential pressure due to the blower in the rotating electrical machine 20 that is a device to be cooled, and allows the desiccant 3 to pass therethrough. This is a circuit for dehumidifying and returning it to the rotary electric machine 20 again.

  The desiccant regeneration circuit evacuates the other drying tower 2 (drying tower 2a in FIG. 1) by a vacuuming means and removes moisture absorbed in the desiccant 3 while heating by the heating tube 4. This circuit regenerates (reactivates) the desiccant 3. In the first embodiment, the vacuum tank 24 and the vacuum pump 25 installed in the oil supply device attached to the rotating electrical machine 20 are used as the vacuuming means. The two drying towers 2a and 2b are operated so as to be alternately a hydrogen gas circulation circuit and a desiccant regeneration circuit.

  The two drying towers 2a and 2b are filled with desiccants 3a and 3b (collectively desiccant 3) in the respective outer containers. Heating pipes 4a and 4b (generally called heating pipes 4) for allowing a warming fluid having a temperature equal to or higher than the ambient temperature to pass therethrough are provided at substantially the center inside the outer container. The desiccant 3 is filled between the heating tube 4 and the outer container.

  The interlocking switching three-way valve 5 serving as a switching means has an inlet valve 5a and an outlet valve 5b that are interlocked with each other, and selects the drying tower 2 that becomes a hydrogen gas circulation circuit. The evacuation closing valve 6 temporarily closes the evacuation of the desiccant regeneration circuit. The vacuum switching valve 7 as another switching means is provided in the desiccant regeneration circuit, and selects the drying tower 2 that performs vacuuming. In the first embodiment, these valves are manually operated by an operator.

  In the first embodiment, high-temperature oil discharged from the sealing oil pump 23 attached to the rotary electric machine 20 is used as the heating fluid that passes through the heating pipe 4 of the drying tower 2. The heated fluid supply pipe 8 constitutes a heated fluid circulation circuit that circulates the heated fluid in the heated pipe 4, and supplies a part of the oil discharged from the sealed oil pump 23 to the drying tower 2. Further, the heating fluid circulation circuit is provided with orifices 9a and 9b for limiting the flow rate of the heating fluid.

  The temperature of the warming fluid is not particularly limited, but heat is supplied to the desiccant 3 of the drying tower 2 in the desiccant regeneration circuit to promote drying. The above is used.

  Next, the operation will be described. The cooling hydrogen gas of the rotating electrical machine 20 is led to the hydrogen gas circulation circuit of the two-column gas drying device 1 via the local supply valve 21, and is transferred from the inlet valve 5a side of the interlocking switching three-way valve 5 to the drying tower 2b. Inflow. After passing through the drying tower 2b, the moisture in the hydrogen gas is removed by contact with the desiccant 3b, and then returns from the outlet valve 5b to the rotating electrical machine 20 via the local return valve 22.

  Further, in the warming fluid circulation circuit, the hot discharge oil supplied from the sealing oil pump 23 flows from the warming fluid supply pipe 8 to the warming pipes 4a and 4b in the drying towers 2a and 2b through the orifices 9a and 9b. It flows while receiving restrictions. The oil that has passed through the heating tubes 4 a and 4 b returns to the vacuum tank 24.

  Further, the drying tower 2a of the desiccant regeneration circuit is connected to the vacuum tank 24 and the vacuum pump 25 through the opened vacuum pulling / closing valve 6 and the vacuum pulling switching valve 7, and is vacuumed. The desiccant 3a of the drying tower 2a is exposed to vacuum, and heat is supplied from the heating tube 4a and the outer container of the drying tower 2a, whereby the absorbed moisture is evaporated and gradually dried. By continuing this state for a certain period, the desiccant 3a of the drying tower 2a becomes dry and is regenerated.

  In the drying tower 2b of the hydrogen gas circulation circuit, the absorbed moisture gradually accumulates when the operation is continued, and the desiccant 3b is saturated. For this reason, after driving | running for a fixed period, operation which replaces the drying towers 2a and 2b of a hydrogen gas circulation circuit and a desiccant reproduction | regeneration circuit is implemented.

  The switching operation procedure is as follows: first, the vacuum pulling shut-off valve 6 is temporarily closed, and then the vacuum pulling switching valve 7 is operated to switch the drying tower 2 b to communicate with the vacuum tank 24. Next, the interlocking switching three-way valve 5 is switched so that the hydrogen gas from the rotating electrical machine 20 flows into the drying tower 2a. Finally, the vacuum closing valve 6 is opened to start vacuum drying of the desiccant 3b in the drying tower 2b.

  Next, as a comparative example of the two-column gas drying apparatus 1 according to Embodiment 1, a desiccant regeneration circuit of a conventional hydrogen gas drying apparatus will be described with reference to FIG. 2 that are the same as or equivalent to those in FIG. 1 are assigned the same reference numerals, and descriptions thereof are omitted.

  The conventional gas drying apparatus is provided with an electric heater 10 and a power source 11 for drying the desiccant 3 inside the drying tower 2. A blower & motor 13 for ventilation is attached in the vicinity of the drying tower 2, and ambient air is sent to the drying tower 2 through the air supply pipe 14. The moist air that has passed through the desiccant 3 is discharged to the outside through the discharge pipe 15.

  In addition, a thermometer 12 with an alarm contact is installed in the drying tower 2 so that the internal temperature does not rise abnormally, and protection is provided to shut off the electric heater 10 when the temperature exceeds the set temperature. In addition, the position limit switch 16 confirms that the interlocking switching three-way valve 5 is completely switched from the hydrogen circulation circuit including the rotating electrical machine 20 to the desiccant regeneration circuit including the blower & motor 13, and the circuit must be switched. For example, the blower & motor 13 and the electric heater 10 cannot be started.

  During the hydrogen gas drying operation, the wet hydrogen gas sent from the rotating electrical machine 20 flows into the drying tower 2 through the open local supply valve 21 and the inlet valve 5a of the interlocking switching three-way valve 5, and is dried. After being dehumidified through the agent 3, it returns to the rotating electrical machine 20 from the open local return valve 22 via the outlet valve 5 b. Since the circuit at this time is isolated from the blower & motor 13 side and the discharge pipe 15 side by the inlet valve 5a and the outlet valve 5b, hydrogen gas does not flow out to the outside.

  On the other hand, at the time of regeneration of the desiccant, the local supply valve 21 and the local return valve 22 are closed to separate the rotary electric machine 20 and the drying tower 2. Thereafter, the interlocking switching three-way valve 5 is operated so that the drying tower 2, the blower & motor 13, and the discharge pipe 15 communicate with each other. That is, the inlet valve 5a is connected to the blower & motor 13 side, and the outlet valve 5b is connected to the discharge pipe 15 side.

  Subsequently, the starter switch of the blower & motor 13 is operated to start the motor, and ambient air is sent from the blower to the drying tower 2. After confirming that the blower & motor 13 is activated, the electric heater 10 is activated to dehumidify the air passing through the desiccant 3. This state is continued for a certain time, and when the dehumidifying agent 3 is dehumidified, the electric heater 10 and the blower & motor 13 are stopped. After leaving until the internal temperature of the drying tower 2 sufficiently decreases, the interlocking switching three-way valve 5 is switched to the rotating electrical machine 20 side, and a hydrogen gas drying operation is performed.

  When the conventional hydrogen gas drying apparatus as shown in FIG. 2 is dried by heating with the electric heater 10 in a state where 1 kg of moisture is absorbed in 12 kg of the desiccant, the moisture removal rate is 90% to 95% in several hours. It was about. Thus, although the conventional hydrogen gas drying apparatus can obtain a high moisture removal rate by the direct heating effect by the electric heater 10, there are the following problems.

  In the conventional hydrogen gas drying apparatus, there is a possibility that hydrogen gas remains in the drying tower 2 even when the interlocking switching three-way valve 5 is completely switched during regeneration of the desiccant. For this reason, it was indispensable to consider explosion prevention, such as starting the blower & motor 13 before the electric heater 10. In addition, it is not desirable in terms of safety management that the hydrogen gas remaining in the drying tower 2 is exhausted outdoors. The two-column gas drying apparatus 1 according to the first embodiment solves these problems.

  FIG. 3 shows the effect of vacuum drying using the heating tube 4 of the two-column gas drying apparatus 1 according to the first embodiment. In FIG. 3, the horizontal axis represents the elapsed drying time (Hr) by evacuation, and the vertical axis represents the amount of residual moisture (g) absorbed by the desiccant.

  As shown in FIG. 3, after the start of vacuum drying, moisture is removed from the desiccant over time. In this measurement result, the water content of 1.1 kg decreased to 345 g in 30 hours, and the water removal rate in 30 hours was about 70%. This value indicates that the moisture removal rate is slower than the direct heat drying by the electric heater in the above-described conventional hydrogen gas drying apparatus. However, even in vacuum drying using the heating tube 4, the moisture removal rate is improved by further increasing the duration of evacuation.

  In actual operation, the amount of moisture entering the rotary electric machine 20 is about 5 to 15 g / day, although it varies depending on the size of the rotary electric machine 20. For example, 12 kg of desiccant will take a minimum of about 66 days to absorb 1 kg of moisture. As an operation example, when the hydrogen gas circulation circuit and the desiccant regeneration circuit are switched every 30 days, the amount of moisture absorbed in the desiccant is 450 g at the maximum, and the duration of vacuum drying is 720 hours. It is considered that a higher water removal rate can be obtained.

  As described above, according to the two-column gas drying apparatus 1 according to the first embodiment, the heating pipe 4 is connected to the desiccant regeneration circuit without using a heat source that may be ignited such as an electric heater. Since the vacuum drying used is performed and a closed circuit configuration in which hydrogen gas does not flow out is realized, ignition and explosion due to hydrogen gas leakage can be prevented, and safety is improved.

  Furthermore, there is an effect that the operation by the operator is facilitated by improving the safety. In addition, since the two drying towers 2a and 2b can be operated alternately at regular intervals to be a hydrogen gas circulation circuit and a desiccant regeneration circuit, it is possible to always perform dehumidification of hydrogen gas.

Embodiment 2. FIG.
4-6 has shown the example of the drying tower in the two-column type gas drying apparatus which concerns on Embodiment 2 of this invention. In the second embodiment, a modification of the drying tower 2 of the two-column gas drying apparatus 1 according to the first embodiment will be described. The overall configuration is the same as that of the first embodiment, and a description thereof will be omitted.

  In the example shown in FIG. 4, the heating tube 4 has heating tube radiating fins 17 for increasing the contact area with the desiccant 3. By attaching the heating pipe radiating fins 17 to the heating pipe 4, the contact area with the desiccant 3 increases, the heat transfer from the heating pipe 4 extends over a wide range of the desiccant 3, and the drying speed increases.

  Further, in the example shown in FIG. 5, the drying tower 2 has drying tower radiating fins 18 for increasing the contact area with the desiccant 3 inside the outer container. By attaching the drying tower radiation fin 18 inside the outer container of the drying tower 2, the contact area with the desiccant 3 is increased, the heat transfer from the surrounding atmosphere reaches the inside of the desiccant 3, and the drying speed is increased. .

  In the example shown in FIG. 6, the heating pipe radiating fins 17 shown in FIG. 4 are provided in the heating pipe 4, and the drying tower radiating fins 18 shown in FIG. 5 are provided inside the outer container of the drying tower 2. . Thereby, both the heat transfer from the heating tube 4 and the heat transfer from the surrounding atmosphere are promoted, and the drying rate is further increased.

  According to the second embodiment, in addition to the same effects as those of the first embodiment, the drying rate and moisture removal rate of the desiccant 3 can be further improved.

Embodiment 3 FIG.
FIG. 7 shows the main part of a two-column gas drying apparatus 1 according to Embodiment 3 of the present invention. 7 that are the same as or equivalent to those in FIG. 1 are assigned the same reference numerals, and descriptions thereof are omitted. In the first embodiment, the vacuum tank 24 and the vacuum pump 25 installed in the oil supply apparatus attached to the rotating electrical machine 20 are used as the vacuuming means. However, the rotating electrical machine 20 does not include a vacuum pump or the like. There is also. In this case, it is not desirable to install a vacuum pump because it requires a large amount of money.

  In the third embodiment, a small ejector 26 is provided as a evacuation means in the rotary electric machine 20 that is not provided with a vacuum pump or the like, and a part of the discharge oil of the attached sealing oil pump 23 is supplied to the rotary electric machine 20. Evacuation is performed. The sealed oil pump 23 is connected to an oil leveling box 27 and a loop seal tank 28.

  According to the third embodiment, even in the rotary electric machine 20 that is not provided with a vacuum pump or the like, the small ejector 26 can be installed at low cost, and it is possible to ensure a vacuuming function by flowing a small amount of oil. it can. As a result, the same vacuuming as in the first embodiment can be performed without affecting the capacity of the sealing oil pump 23.

Embodiment 4 FIG.
FIG. 8 shows a main part of a two-column gas drying apparatus 1A according to Embodiment 4 of the present invention. 8 that are the same as or equivalent to those in FIG. 1 are assigned the same reference numerals, and descriptions thereof are omitted. A two-column gas drying apparatus 1A according to the fourth embodiment is a modification of the two-column gas drying apparatus 1 (FIG. 1) according to the first embodiment. In the first embodiment, the switching of each valve, which is a switching means, is manually performed by an operator. However, in the fourth embodiment, all of these manual valves are automatic valves and are controlled by the valve switching controller 30. It controls the switching of the valve.

  Specifically, the hydrogen gas circulation circuit includes an automatic switching inlet valve 32 that selects a drying tower 2 (drying tower 2b in FIG. 8) that is provided upstream of the drying tower 2 and introduces hydrogen gas, and the drying tower 2 An automatic switching outlet valve 33 that is provided further downstream and interlocks with the automatic switching inlet valve 32 is provided. Further, the desiccant regeneration circuit is provided between a vacuum evacuation automatic switching valve 34 for selecting a drying tower 2 (drying tower 2a in FIG. 8) for evacuation, and a vacuum tank 24 and a vacuum evacuation automatic switching valve 34. A vacuum evacuation automatic closing valve 31 is provided.

  The operation of the valve switching controller 30 when the hydrogen gas circulation circuit and the desiccant regeneration circuit are switched in the two-column gas drying apparatus 1A according to the fourth embodiment will be described. First, the evacuation automatic closing valve 31 is fully closed. After it is confirmed by the signal that the valve is fully closed, the automatic switching inlet valve 32 and the automatic switching outlet valve 33 are switched to change the drying tower 2 into which hydrogen gas is introduced. Subsequently, the evacuation automatic switching valve 34 is switched to change the drying tower 2 to be evacuated. When the above switching of the automatic valve is completed, the evacuation automatic closing valve 31 is finally opened to start evacuation.

  According to the fourth embodiment, in addition to the same effects as those of the first embodiment, each valve is an automatic valve and is controlled by an open / close signal from the valve switching controller 30. There is no need to be involved in the operation, and the burden is greatly reduced.

Embodiment 5 FIG.
FIG. 9 shows a main part of a two-column gas drying apparatus 1A according to Embodiment 5 of the present invention. In FIG. 9, the same reference numerals are given to the same and corresponding parts as in FIG. A two-column gas drying apparatus 1A according to the fifth embodiment is a modification of the two-column gas drying apparatus 1 (FIG. 7) according to the third embodiment, and includes a rotating electrical machine 20 that does not include a vacuum tank or the like. A small ejector 26 is provided as a evacuation means in the above, and each valve is an automatic valve and controlled by an open / close signal from the valve switching controller 30. In the fifth embodiment, the same effect as in the fourth embodiment can be obtained.

Embodiment 6 FIG.
FIG. 10 shows a main part of a two-column gas drying apparatus 1B according to Embodiment 6 of the present invention. 10 that are the same as or equivalent to those in FIG. 1 are assigned the same reference numerals, and descriptions thereof are omitted. A two-column gas drying apparatus 1B according to the fifth embodiment is a modification of the two-column gas drying apparatus 1 (FIG. 1) according to the first embodiment, and circulates through the heating tube 4 of the drying tower 2. A high-temperature hydrogen gas derived from the rotating electrical machine 20 is used as the heating fluid to be used.

  In the sixth embodiment, as shown in FIG. 10, hydrogen gas flows from the rotating electrical machine 20 through the local supply valve 21 into the two-column gas drying apparatus 1B, and a part of the hydrogen gas flows into the interlocking switching three-way valve 5. The other flows to the hydrogen circulation circuit via the inlet valve 5a, and the other flows to the heated fluid supply pipe 8a of the desiccant regeneration circuit.

  According to the sixth embodiment, by using hydrogen gas instead of the high-temperature oil discharged from the sealing oil pump 23 as the heating fluid that circulates the heating pipe 4, although the heating effect is inferior, This eliminates the need for additional piping, reducing costs and improving safety.

Embodiment 7 FIG.
FIG. 11 shows the main part of a two-column gas drying apparatus 1B according to Embodiment 7 of the present invention. In FIG. 11, the same reference numerals are given to the same and corresponding parts as in FIG. 1, and description thereof is omitted. A two-column gas drying apparatus 1B according to the seventh embodiment is a modification of the two-column gas drying apparatus 1 (FIG. 7) according to the third embodiment, and includes a rotating electrical machine 20 that does not include a vacuum tank or the like. A small ejector 26 is provided as a vacuum evacuation means, and a high-temperature hydrogen gas derived from the rotating electrical machine 20 is used as a heating fluid for circulating the heating tube 4 of the drying tower 2. Also in the seventh embodiment, the same effect as in the third and sixth embodiments can be obtained.

Embodiment 8 FIG.
FIG. 12 shows the main part of a two-column gas drying apparatus 1C according to Embodiment 8 of the present invention. In FIG. 12, the same reference numerals are given to the same or corresponding parts as in FIG. A two-column gas drying apparatus 1C according to the eighth embodiment is a modification of the two-column gas drying apparatus 1A (FIG. 8) according to the fourth embodiment, and each valve is an automatic valve and a valve switching controller. The high-temperature hydrogen gas derived from the rotating electrical machine 20 is used as a heating fluid that is controlled by an open / close signal from 30 and circulates through the heating pipe 4 of the drying tower 2. Also in the eighth embodiment, the same effect as in the fourth and sixth embodiments can be obtained.

Embodiment 9 FIG.
FIG. 13 shows a main part of a two-column gas drying apparatus 1C according to Embodiment 9 of the present invention. In FIG. 13, the same and corresponding parts as in FIG. A two-column gas drying apparatus 1C according to the ninth embodiment is a modification of the two-column gas drying apparatus 1A (FIG. 9) according to the fifth embodiment.

  In the ninth embodiment, a small ejector 26 is provided as a vacuum evacuation means in the rotary electric machine 20 that is not provided with a vacuum tank or the like, and each valve is an automatic valve and is controlled by an open / close signal from the valve switching controller 30, A high-temperature hydrogen gas derived from the rotating electrical machine 20 is used as a heating fluid that circulates through the heating tube 4 of the drying tower 2. Also in the ninth embodiment, the same effect as in the fifth and sixth embodiments can be obtained.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  INDUSTRIAL APPLICABILITY The present invention can be used as a hydrogen gas drying device that dries cooling hydrogen gas for a cooled device such as a rotating electrical machine.

1, 1A, 1B, 1C Two-column gas dryer, 2, 2a, 2b
3, 3a, 3b desiccant, 4, 4a, 4b heating tube,
5 interlocking switching three-way valve, 5a inlet valve, 5b outlet valve, 6 vacuum closing valve,
7 Vacuum switching valve, 8 and 8a Heated fluid supply pipe, 9a and 9b Orifice, 10 Electric heater, 11 Power supply, 12 Thermometer with alarm contact, 13 Blower & motor, 14 Air supply pipe, 15 Release pipe, 16 Position Limit switch, 17 Heating pipe radiating fin, 18 Drying tower radiating fin, 20 Rotating electric machine, 21 Local supply valve, 22 Local return valve, 23 Sealed oil pump, 24 Vacuum tank, 25 Vacuum pump, 26 Small ejector, 27 Oil leveler Casing box, 28 loop seal tank, 30 valve switching controller, 31 automatic vacuum closing valve, 32 automatic switching inlet valve, 33 automatic switching outlet valve, 34 automatic vacuum switching valve.

Claims (9)

A hydrogen gas drying device for dehumidifying the cooling hydrogen gas of the equipment to be cooled outside the machine,
Two drying towers each having a heating pipe for passing a heating fluid of at least the ambient temperature or more and filled with a desiccant between the heating pipe and the outer container;
A hydrogen gas circulation circuit that guides hydrogen gas to one of the drying towers using a differential pressure by a blower in the cooled equipment, and passes the desiccant back into the cooled equipment;
A desiccant regeneration circuit for evacuating the other drying tower with a vacuuming means and heating with the heating tube to remove moisture absorbed by the desiccant;
A heating fluid circulation circuit for circulating a heating fluid through the heating tube;
A hydrogen gas drying apparatus comprising switching means including a switching valve for selecting the drying tower to be the hydrogen gas circulation circuit and a switching valve for selecting the drying tower to be the desiccant regeneration circuit.   2. The hydrogen gas drying apparatus according to claim 1, wherein the heating pipe has a heating pipe radiating fin for increasing a contact area with the desiccant.   The said drying tower has a drying tower radiation fin for increasing the contact area with the said desiccant inside the said outer container, The hydrogen gas drying apparatus of Claim 1 or Claim 2 characterized by the above-mentioned.   The hydrogen gas drying according to any one of claims 1 to 3, wherein a discharge oil of a sealed oil pump attached to a device to be cooled is used as a heating fluid for circulating the heating pipe. apparatus.   The hydrogen gas drying apparatus according to any one of claims 1 to 3, wherein hydrogen gas derived from a device to be cooled is used as a heating fluid that circulates through the heating pipe.   The hydrogen gas drying apparatus according to any one of claims 1 to 5, wherein a vacuum pump or a vacuum tank installed in an oil supply apparatus attached to the equipment to be cooled is used as the evacuation means. .   6. The evacuation is performed by providing an ejector as the evacuation means and supplying a part of discharge oil of a sealing oil pump attached to the cooled device to the ejector. A hydrogen gas drying apparatus according to claim 1.   As the switching means, an automatic switching inlet valve for selecting the drying tower for introducing hydrogen gas provided upstream from the drying tower in the hydrogen gas circulation circuit, and downstream from the drying tower in the hydrogen gas circulation circuit. An automatic switching outlet valve provided and interlocked with the automatic switching inlet valve; an evacuation automatic switching valve provided in the desiccant regeneration circuit for selecting the drying tower for evacuation; the evacuation means; and the evacuation automatic 8. A vacuum evacuation automatic closing valve provided between the switching valve and a valve switching controller for controlling switching between these valves. Hydrogen gas drying equipment.   A rotating electrical machine, and a hydrogen gas drying device that circulates and dehumidifies a cooling hydrogen gas of a device to be cooled of the rotating electrical machine, and the hydrogen gas drying device is any one of claims 1 to 8. A rotating electrical machine system, characterized in that it is a hydrogen gas drying device described in the item.