JPH0744805B2 - Method for adjusting hydrogen pressure of hydrogen-cooled rotating electric machine - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a hydrogen-cooled rotary electric machine, and more particularly to a hydrogen-cooled rotary electric machine in which the hydrogen gas pressure in the machine can be adjusted according to the load variation by using a hydrogen storage alloy. Regarding pressure adjustment method.

[Technical background of the invention and its problems]

Some rotating electrical machines, such as turbine generators, use hydrogen gas as a cooling medium. In this case, it is necessary to increase the heat capacity of the hydrogen gas inside the machine as the unit capacity of the turbine generator increases, that is, (specific weight) × (specific heat) to improve the cooling effect. Some have a pressure of, for example, 5.2 atm.

However, in recent years, the use of turbine generators has become more frequent and
It may be used at partial load as well as 100% load. During this partial load, there is little electric loss in the generator, and it is not necessary to keep the hydrogen gas pressure at 5.2 atm for cooling. If the hydrogen gas pressure inside the machine is kept at 5.2 atm during partial load, rotor windage loss and fan power will be the same as at 100% load, resulting in reduced generator efficiency. Therefore, in such a case, by lowering the hydrogen gas pressure inside the machine, windage of the rotor and fan power are reduced, and the efficiency of the generator under partial load can be improved. Also, if the hydrogen pressure is kept constant regardless of the load, it will be supercooled during partial load, and the heat cycle depending on the load will be applied to the rotating electrical machine components, such as insulators, but depending on the load. If the hydrogen pressure is changed by
There is also an advantage that the life of the rotating electric machine is increased.

Therefore, conventionally, the hydrogen gas pressure inside the machine has been adjusted by discharging the hydrogen gas inside the machine to the atmosphere according to the change in the load or by reinjecting it from a high-pressure hydrogen gas cylinder. However, in this method, the operations for injecting and releasing hydrogen gas are complicated, and it is necessary to take sufficient safety measures in handling hydrogen gas, and the consumption of hydrogen gas will be enormous. However, there is a problem from the viewpoint of effective use of energy.

Moreover, as a means for solving such a problem, for example,
There is an invention in which the hydrogen gas pressure inside the turbine generator can be adjusted by a pressure adjustment control mechanism according to the fluctuation of the load, as in the invention described in Japanese Patent No. 55-12720.

FIG. 10 shows a hydrogen gas pressure adjusting system in such a conventional hydrogen-cooled turbine generator. That is,
In a turbine generator 31 connected to an external load system as shown in FIG. 10, hydrogen gas filled in a hydrogen gas cylinder 33 can be supplied to the inside 32 of the turbine generator 31 through a pressure adjusting valve 34, and As a control system for adjusting the hydrogen gas pressure of, the relief hydrogen reserve chamber 36 communicating with the inside of the aircraft through the pressure regulating valve 35, the volume of this reserve chamber 36 is adjusted and the inside of the aircraft 32
This piston 37 that allows the hydrogen gas of
The magnitude of the load is detected by the outputs of the piston drive mechanism 38 and the turbine generator 31 that drive the engine, and a drive command is given to the piston drive mechanism 38 according to the load fluctuation and an opening / closing command is given to the pressure regulating valve 35. It is composed of a load following control mechanism 39.

Therefore, in the hydrogen gas pressure adjusting system of the turbine generator having such a configuration, the pressure of the hydrogen gas cylinder 33 is normally controlled by the pressure adjusting valve 34 so that the pressure is controlled to be constant, and when the load fluctuates, the load is changed. Drive the piston 37 based on the command from the tracking control mechanism 39 to adjust the volume of the reserve chamber 36 and control the opening degree of the pressure adjustment valve 35 to change the hydrogen gas pressure in the turbine generator 32 to the load fluctuation. It can be adjusted accordingly.

However, in the hydrogen gas pressure adjusting system of such a turbine generator, the volume of the reserve chamber 36 is adjusted by the piston 37 that slides on the peripheral surface of the reserve chamber, so that the volume between the piston 37 and the peripheral surface of the reserve chamber is adjusted. If the seal is not sufficient, the high-pressure hydrogen gas on the side communicating with the inside of the machine may leak to the back side of the piston in the atmospheric state, leading to an explosion.

Therefore, recently, the hydrogen gas pressure in the machine can be easily adjusted without using the relief hydrogen reserve chamber and the drive device such as a piston for adjusting the volume of the reserve chamber as described above, and the consumption of hydrogen gas can be eliminated. The use of hydrogen storage alloys is being considered.

This hydrogen storage alloy is a combination of metal atoms such as titanium and mesh metal, which have the property of absorbing hydrogen very well.When the temperature is lowered or the pressure is raised, hydrogen gas is absorbed and heat is generated. If the temperature is raised or the pressure is lowered, the absorbed hydrogen gas is released and heat is absorbed from the surroundings.Also, the temperature of the alloy itself changes depending on the pressure value of the hydrogen gas sent in, and conversely the temperature of the alloy itself is changed. There is a correlation that the pressure of hydrogen gas generated by is also different.

FIG. 7 shows a characteristic example of a hydrogen storage alloy. That is, as shown in Fig. 7, the characteristics of the hydrogen storage alloy are upward-sloping characteristics with a substantially flat portion in the center. The upward-sloping portion on the left side of this characteristic is the hydrogen The solid solution stage, the flat part in the center is the stage of forming metal hydride by hydrogenation reaction, and the rising part on the right side of the characteristic is the supersaturated solid solution stage in which all the metals are hydrogenated and hydrogen is supersaturated between the lattices.

Of these, hydrogen is most absorbed in the hydrogen compound formation stage, and since the reaction proceeds at a substantially constant pressure, this portion is called an equilibrium portion, and that pressure is called an equilibrium pressure. This equilibrium pressure depends on the temperature of the hydrogen storage alloy and also on the type of hydrogen storage alloy. An example of the relationship between the equilibrium pressure and the temperature is shown in FIG.

When a hydrogen storage alloy having such characteristics is placed in a closed container and heated and cooled, the hydrogen gas pressure in the container changes as shown in the following equation.

The volume of the container is V (m ³ ), the initial pressure in the container P ₀ (Kg / c
m ² ), hydrogen content capacity of hydrogen storage alloy k (m ³ / Kg atmospheric pressure conversion), sufficient cooling to absorb and release hydrogen gas,
When heating is performed, the pressure P in the container is P = P ₀ ± KM / V, where + indicates release and − indicates absorption.

By utilizing the characteristics of the hydrogen storage alloy as described above, the hydrogen pressure in the rotating electric machine can be adjusted to a stationary type, but in this case, it is necessary to heat and cool the hydrogen storage alloy. In heating and cooling this hydrogen storage alloy,
If possible, it is advantageous in terms of energy if the exhaust heat of the cooling medium used in the rotating electric machine can be utilized.

Therefore, when the load on the rotating electrical machine is large, the hydrogen storage alloy is heated to release hydrogen gas to increase the internal pressure of the machine, and when the load is reduced, the hydrogen storage alloy is cooled to adsorb hydrogen gas. It suffices to reduce the internal pressure of the machine, but in that case, it is conceivable to use the stator winding cooling water which is the cooling medium of the rotating electric machine, the temperature of which changes according to the change of load.

On the other hand, there is an allowable pressure in the relationship between the load on the rotating electric machine and the hydrogen gas pressure.There is an electrical loss when the load decreases and the temperature rise of the member of the rotating electric machine due to reduced hydrogen gas cooling is 100% load. The allowable hydrogen gas pressure is determined from the condition that it is the same as the temperature rise.

Therefore, when the exhaust heat of the cooling medium of the rotating electric machine is used for heating and cooling of the hydrogen storage alloy, the allowable hydrogen pressure for the load of the rotating electric machine and the hydrogen balance of the hydrogen storage alloy for the exhaust heat temperature of the cooling medium generated by the load. If the pressures are the same, the exhaust gas can be used as it is to heat and cool the hydrogen storage alloy to completely automatically adjust the hydrogen gas pressure according to the load of the rotating electric machine.

However, for example, when the exhaust heat of the stator winding cooling water is used, as shown in FIG. 9, the characteristics (a), (b), (c) and (d) of the hydrogen storage alloy and the exhaust heat temperature with respect to the load are used. And the allowable hydrogen gas pressure (A) do not match.
Further, the hydrogen storage alloy is generally powdery, and hydrogen gas is present between the particles, so that the heat conduction is worse than that of the solid metal,
There is a time lag from cooling or heating to the hydrogen equilibrium pressure of the hydrogen storage alloy. Especially when the load is rapidly increased, the delay in the increase of the hydrogen gas pressure leads to the heating of the components of the rotating electric machine, so a time lag must be avoided.

As described above, when the hydrogen storage alloy is used for adjusting the hydrogen gas pressure of the rotating electric machine, there are problems such as inconsistency in characteristics of the hydrogen storage alloy and time lag.

[Object of the Invention]

The present invention has been made to solve these problems, and facilitates selection of a hydrogen storage alloy, and can reduce the time lag from cooling or heating to the hydrogen equilibrium pressure of the hydrogen storage alloy, resulting in a sharp load. It is an object of the present invention to provide a hydrogen pressure adjusting method for a hydrogen-cooled rotating electric machine that can quickly adjust the pressure of hydrogen gas inside the machine even when the temperature changes to.

[Outline of Invention]

In order to achieve such an object, the present invention provides a case storing a hydrogen storage alloy that releases or adsorbs hydrogen gas due to temperature change, outside the rotating electric machine cooled by hydrogen gas, and in this case, a cooling medium for the rotating electric machine. The pipe for introducing the is connected to the inside of the machine and connected to the hydrogen gas circulation system in the machine for connecting and disconnecting the hydrogen gas, and a valve is provided in the middle of each pipe, which is formed in the case. When adjusting the in-machine hydrogen gas pressure according to load fluctuations by flowing in and out the cooling medium of the rotating electrical machine to the flow passage and cooling or heating the hydrogen storage alloy, as the hydrogen storage alloy of the cooling medium of the rotating electrical machine At the discharge temperature, the hydrogen equilibrium pressure is equal to or higher than the upper limit of the regulated pressure inside the machine, and at the supply temperature of the cooling medium of the rotating electric machine, the hydrogen equilibrium pressure of the hydrogen storage alloy is the maximum regulated pressure inside the machine. A hydrogen storage alloy that is less than or equal to the limit and keeps the gas pressure in the case to be higher than or equal to the upper limit or lower than the lower limit of the regulated pressure, and opens or closes the valve according to the fluctuation of the load to release hydrogen gas into the aircraft or It is characterized in that the hydrogen gas in the machine is adsorbed to adjust the hydrogen gas pressure in the machine.

Example of Invention

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the configuration of a hydrogen pressure adjusting device for a hydrogen-cooled rotary electric machine according to the present invention. In FIG. 1, 1 is a rotating electric machine, for example, a stator frame of a turbine generator,
A stator core 3 having a stator winding 2 made of a hollow conductor through which cooling water can flow in and out is attached to the inner peripheral surface thereof, and a gas ventilation space 4 is formed in the back portion thereof. Reference numeral 5 denotes a rotor supported by bearings, and a self-fan 6 is attached to the rotor 5 for forcibly circulating the hydrogen gas 7 sealed in the machine at a pressure higher than atmospheric pressure. Further, 8a and 8b are headers for passing cooling water through the hollow conductors of the stator winding 2, and a pure water supply device 9 provided outside the machine is installed in these headers 8a and 8b via pipes 10a and 10b. It is connected. The pure water supply device 9 is composed of a tank 11, a pump 12, a cooler 13 and an ion exchange resin (not shown). On the other hand, 14 is a case provided outside the machine, and this case 14 has an upper header 15 at approximately the center of the peripheral surface of the cylindrical body.
In addition, a plurality of heat transfer tubes 16 are arranged inside along the longitudinal direction of the cylindrical body, and a powdery hydrogen storage alloy 17 is provided in the outer space formed between these heat transfer tubes 16. Is filled. In such a case 14, a pipe 10a connecting the cooling water outflow side header 8a of the stator winding 2 and the tank 11 of the pure water supply device 9 to one opening of the cylindrical body.
Connect the pipe 18a connected in the middle of the
8a and a pipe 10b in the vicinity of the outlet of the cooler 13 are connected by a pipe 21, and a pipe 18b for returning the cooling water to the tank 11 of the pure water supply device 9 is connected to the other opening of the cylindrical body for cooling water. Form a bypass path that bypasses a part of Further case
The upper header 15 of 14 is provided with a breathable filter 19 for preventing dust and particles from floating or scattering in the machine, and this portion is connected to the gas ventilation space 4 in the machine through the pipe 20. The hydrogen gas released from the hydrogen storage alloy 17 or adsorbed to the hydrogen storage alloy 17 can be flowed to and from the inside of the aircraft. Further, 22a, 22b and 22c are a pipe 18a forming a cooling water bypass passage connected to one opening of the case 14, a pipe 21 connecting the pipe 18a and a pipe 10b near the outlet of the cooler 13, and an upper header 15 Piping 20 that serves as a hydrogen gas flow passage that connects the
The solenoid valves are provided at appropriate places respectively.

In the hydrogen pressure adjusting system of the hydrogen-cooled turbine generator configured as described above, the hydrogen equilibrium pressure is 5.2 K at a temperature of 80 ° to 60 ° C., for example, as the hydrogen storage alloy filled in the case 14.
It is assumed that the hydrogen equilibrium pressure of 1.0 kg / cm ² or less is selected at g / cm ² or more and the cooling water low temperature side temperature of 45 ° to 40 ° C. Under such conditions, when the solenoid valve 22a is now open and the solenoid valves 22b and 22c are closed, the cooling water is piped from the tank 11 of the pure supply device 9 to the hollow conductor of the stator winding 2.
b, inflow through the inflow side header 8b, outflow side header 8a
To the tank 11 of the pure water supply device 9 through the pipe 10a. The stator winding cooling water circulation system cools the stator winding 2, and at this time, the stator winding cooling water is heated by heat due to electrical loss of the winding. It becomes waste heat water. The waste heat water further flows into the case 14 through the bypass pipe 18a and the solenoid valve 22a, where the hydrogen storage alloy 17 is heated and then returns to the tank 11 through the pipe 18b. Therefore, since the solenoid valve 22c is closed, the inside of the case 14 is boosted to the hydrogen equilibrium pressure of the exhaust hot water temperature by the hydrogen gas generated from the hydrogen storage alloy 17.

On the other hand, when the solenoid valves 22a and 22b are closed and the solenoid valve 22c is opened, the low-temperature cooling water flowing out from the outlet of the cooler 13 flows into the case 14 through the pipe 21 and cools the hydrogen storage alloy 17 in the case 14. Then return to tank 11. Therefore, in this case, the hydrogen gas in the case 14 is adsorbed by the hydrogen storage alloy 17, and the hydrogen gas pressure in the case 14 drops to the hydrogen equilibrium pressure of the temperature of the cooling water.

Here, the specific operation will be described based on the load pattern shown in FIG.

In Fig. 2, when the load is low at night (shown between D and A), the solenoid valve 22a in Fig. 1 is opened and the solenoid valves 22b, 2
Keep 2c closed. With this configuration, as described above, the exhaust heat water flowing out from the cooling water outflow side header 8a of the stator winding 2 passes through the case 14 and the tank of the pure water supply device 9
By flowing to 11, the hydrogen storage alloy 17 filled in the case 14 is warmed, and the hydrogen gas regenerated from the hydrogen storage alloy 17 causes the inside of the case 14 to have an allowable hydrogen pressure of 5.2 atm or more of the rotating electric machine at 100% load. Become. When in this state,
When it becomes the morning (between A and B) and the load increases, the opening degree of the solenoid valve 22c is adjusted according to the load and hydrogen gas is discharged from the case 14 through the pipe 20 into the machine. Therefore, the hydrogen gas pressure inside the machine rises to the allowable hydrogen gas pressure for the load. The solenoid valve 22c is opened only when necessary and is normally closed.

When the load rise is completed and the load reaches the point B where the load is stabilized, the solenoid valves 22a and 22c are closed, the solenoid valve 22b is opened, and the low temperature cooling water flowing out from the cooler 13 flows into the case 14. Therefore, since the hydrogen storage alloy 17 in the case 14 is cooled, the hydrogen gas pressure in the case 14 becomes 1.0 Kg / cm ² or less, and prepares for the load reduction in the evening.

In the evening, when the load is reduced as shown in the figure between C and D, the solenoid valve 19c is opened according to the load at that time and the opening is adjusted to allow the hydrogen gas in the machine to flow into the case 14 so that the hydrogen gas is discharged. Adsorb on the storage alloy 17 and adjust to the allowable hydrogen gas pressure for the load. Then, when the load reduction is completed and the load reaches the point D shown in the figure where it stabilizes, the solenoid valve 22a is opened in reverse, the solenoid valves 22b and 22c are closed, and the stator winding 2 is attached to the heat exchanger 14.
Exhaust heat water that flows out from the cooling water outflow side header 8a flows into the case 14 in the same manner as described above to heat the hydrogen storage alloy 17 in the case 14, and the hydrogen gas pressure in the case 14 is set to 5.2 Kg / cm ² or more. Be prepared for a load increase in the morning.

As described above, according to the present embodiment, the characteristics of the hydrogen storage alloy 17 are that the hydrogen equilibrium pressure is not less than 5.2 Kg / cm ² at 80 ° to 60 ° C., 45
The hydrogen equilibrium pressure is 1.0Kg / cm ² or less at ° -40 ° C, which makes the selection of hydrogen storage alloy easy, and since the hydrogen storage alloy is in powder form, it has poor thermal conductivity and starts heating and cooling. There was a time lag from when the load was adjusted to the prescribed pressure, but since the load is ready for the next load when the load stabilizes, it is possible to quickly adjust the pressure for load fluctuations. Becomes Further, since the hydrogen storage alloy is heated by using the waste heat water after cooling the stator winding, it is extremely advantageous in terms of energy. Further, since the hydrogen storage alloy is in powder form, when hydrogen gas is released from the case 14, there is a risk that it will enter the machine as dust and deteriorate the electrical withstand voltage. Is provided, the reliability can be improved without the concern.

Of course, since the hydrogen gas pressure inside the machine is adjusted according to the load, wind loss and fan power during partial load are reduced, the efficiency of the rotary electric machine is improved, and the heat cycle of the rotary electric machine constituent members is reduced. Therefore, the life of the rotating electric machine is extended and the reliability is increased. In addition, the hydrogen gas pressure can be adjusted without exhaustion of hydrogen gas, and all hydrogen gas can be recovered in the hydrogen storage alloy without being released to the atmosphere during periodic inspection of rotating electric machines, so effective use of energy is possible. Can be achieved.

Next, another embodiment of the present invention will be described.

FIG. 3 shows another configuration example of the hydrogen pressure adjusting system of the hydrogen-cooled rotary electric machine. The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. Here, only different parts will be described. . In this embodiment, there are two cases as shown in FIG.
14A and 14B are provided, and one of the openings of the cylindrical body is provided with a cooling water outflow side header 8a and a tank of the pure supply device 9.
A solenoid valve 23, 24 is provided in the middle of the pipe 10a connecting the 11 through the pipes 18a1, 18a2, and solenoid valves 23, 24 are provided in the middle of the pipe 18a1, 18a2. Connect the pipes 18b1 and 18b2 to return to 11, and then connect the case 14A and 1
4B is provided with solenoid valves 25 and 26 in the middle of a branch pipe that branches the pipes 18a1 and 18a2 near one opening, and these are connected in common, and the common connection part is connected by a pipe 21 near the outlet of the cooler 13. Connect to pipe 10b. Further, the upper headers of the cases 14A and 14B are connected to the inside of the machine by communicating with the pipes 20a and 20b, respectively, and solenoid valves 27 and 28 are provided in the middle of these pipes 20a and 20b, respectively, and a pipe 29 is commonly used between the upper headers. The structure is such that the solenoid valve 30 is provided in the middle of the connection.

Next, the operation of the above configuration will be described based on the load pattern shown in FIG.

Now, in FIG. 4, one case is shown at the point E in the morning.
It is assumed that 14A is in a high pressure state and the other case 14B is in a low pressure state. In such a state, pressure adjustment with respect to load changes from morning to afternoon to evening E to F is performed as follows. First, when the load is increased, the solenoid valve 27 on the case 14A side is opened and its opening is adjusted to release hydrogen gas into the machine to increase the hydrogen gas pressure in the machine. On the other hand, when the load is reduced, the solenoid valve 28 on the case 14B side is opened and the opening thereof is adjusted to adsorb the hydrogen gas in the machine to reduce the hydrogen gas pressure in the machine. In this case, as in the embodiment shown in FIG. 1, the solenoid valves 23 and 26 are open, 24 and 25 are closed, and the solenoid valve 30 is also closed.

Through the daytime operation as described above, the case 14A releases a certain amount of hydrogen gas, and the case 14B adsorbs the hydrogen gas inside the aircraft. Here, the state will be described with reference to the characteristic curve diagram of the hydrogen storage alloy shown in FIG. That is, case 14A,
In FIG. 5 showing the relationship between the amount of hydrogen in the hydrogen storage alloy in 14B and the hydrogen equilibrium pressure, if the load is now at point E in FIG. 4, then case 14A is at point 1 in FIG. , The load is F
If it is at a point, it moves to point 2 due to the release of hydrogen gas. Also,
Case 14B is located at point 4 when the load is at point E, and moves to point 5 when the load is at point F due to absorption of hydrogen gas. When the load has passed the point F in Fig. 4 and entered at night, and when it became stable at a low load, leave it as it is, open the solenoid valve 30 to communicate between the heat exchangers 14A and 14B, and fill the hydrogen storage alloy. Allow hydrogen gas to flow in and out of the room. In this case, solenoid valves 26, 27
Of course, is closed. By doing so, in the characteristic curve of the hydrogen storage alloy shown in FIG. 5, the hydrogen gas pressures in cases 14A and 14B are the same, and the value is P
= (Pa + Pb) / 2. That is, the case 14A releases hydrogen gas to the case 14B, the case 14B adsorbs hydrogen gas, and the case 14A moves to point 3 and the case 14B moves to point 6. Therefore, Case 14A has a low hydrogen gas content,
In case 14B, since the hydrogen gas content is large, the hydrogen content is completely opposite to the point E at the load pattern shown in FIG. When this state reaches an equilibrium state, the solenoid valve 30 is closed, the solenoid valves 23 and 26 are closed, and the solenoid valves 24 and 25 are opened to reverse the temperature of the cooling water for heating and cooling the hydrogen storage alloy. In this case, the solenoid valves 25 and 27 are, of course, in the closed state. In this way, case 14A is low pressure, case 1
4B will be in a high pressure state and will be prepared for load changes in the morning.

In the above example, when the nighttime load is extremely low and the exhaust heat temperature of the stator winding cooling water is low, the hydrogen storage alloy does not reach the upper limit pressure adjusted by the exhaust heat temperature, for example, 5.2 Kg / cm ² or more. In this case, it is possible to increase the exhaust heat temperature by providing a cooling water reheater 31 in the pipe 10a connected to the cooling water discharge side header as shown in FIG.

Also, if the load pattern changes extremely frequently both day and night, there is no time to switch between the high-voltage case and the low-voltage case beforehand. In such a case, prepare two pairs of high-voltage and low-voltage cases. You may make it correspond.

By providing a plurality of cases (two in the above embodiment) in this way, it is possible to quickly adjust the in-machine hydrogen gas pressure of the rotating electric machine according to the load even when the load pattern changes.

In the embodiment shown in FIGS. 1 and 3 described above, the stator winding cooling system is used as a medium for cooling and heating the hydrogen storage alloy. However, hydrogen gas, which is the cooling medium for the rotating electric machine, should be used. May be. In this case, for heating the hydrogen storage alloy, hydrogen gas with a higher temperature than the inlet of the hydrogen gas cooler installed inside the machine is introduced into the case, and hydrogen gas with a low temperature at the outlet of the hydrogen gas cooler is introduced. Can be carried out by introducing it into a case for cooling.

〔The invention's effect〕

As described above, in the present invention, a case containing a hydrogen storage alloy that releases or adsorbs hydrogen gas due to temperature change is provided outside the rotating electric machine cooled by hydrogen gas, and the cooling medium for the rotating electric machine is provided in this case. The pipe to be introduced is connected to the inside of the machine so as to be connected to the hydrogen gas circulation system inside the machine, and the pipe for flowing the hydrogen gas into and out of the machine is connected to provide a valve in the middle of each pipe, which is formed in the case. When adjusting the in-machine hydrogen gas pressure according to load fluctuations by flowing the cooling medium of the rotating electric machine into and out of the flow passage to cool or heat the hydrogen storage alloy, the cooling medium of the rotating electric machine is used as the hydrogen storage alloy. The hydrogen equilibrium pressure at the exhaust temperature is equal to or higher than the maximum adjustment pressure inside the machine, and the hydrogen equilibrium pressure of the hydrogen storage alloy is at the adjustment pressure maximum inside the machine at the supply temperature of the cooling medium of the rotating electric machine. A hydrogen storage alloy below the limit is selected and the gas pressure in the case is kept above the adjustment upper limit or below the lower limit, and the hydrogen gas is released into the machine by opening or closing the valve according to the change in load. The hydrogen gas in the machine is adsorbed to adjust the hydrogen gas pressure in the machine. Therefore, the conditions for selecting the hydrogen storage alloy become extremely lenient, which facilitates the selection of the hydrogen storage alloy, and preheats or cools the hydrogen storage alloy to adjust the hydrogen gas pressure in the case to the adjusted pressure upper limit or higher. Or, since it is set to the lower limit or less, even if the load changes abruptly, the solenoid valve provided in the middle of the pipe for flowing hydrogen gas in and out of the hydrogen gas circulation system in the machine can be opened It is possible to provide a hydrogen pressure adjusting method for a hydrogen-cooled rotating electric machine that can quickly adjust the hydrogen gas pressure.

[Brief description of drawings]

FIG. 1 is a block diagram of a hydrogen pressure adjusting system of a hydrogen-cooled rotary electric machine showing an embodiment for explaining the method of the present invention, and FIG. 2 is a load pattern diagram of the rotary electric machine for explaining the operation of the embodiment. 3 is a configuration diagram of a hydrogen pressure adjusting system of a hydrogen-cooled rotary electric machine for explaining another embodiment of the present invention, and FIG. 4 is a load pattern diagram of the rotary electric machine for explaining the operation of the embodiment. FIG. 5 is a state diagram of adsorption and release of hydrogen gas from the hydrogen storage alloy with respect to the load pattern of FIG. 4, and FIG. 6 is cooling water introduction for introducing stator winding cooling water to the heat exchanger in FIG. Partial configuration diagrams showing a modified example of the system, FIGS. 7 and 8
The figure is a diagram for explaining an example of the characteristics of the hydrogen storage alloy, FIG. 9 is a relationship diagram of the characteristics of the hydrogen storage alloy, the stator winding cooling water outlet temperature and the allowable hydrogen gas pressure in the machine, and FIG. It is a block diagram which shows the hydrogen pressure adjustment system of a turbine generator. 1 ... Stator frame, 2 ... Stator winding, 3 ... Stator core, 4 ... Space part, 5 ... Rotor, 6 ... Self fan, 7 ... Hydrogen gas, 8a, 8b ... … Header, 10a, 10b ……
Piping, 11 …… tank, 12 …… pump, 13 …… cooler, 1
4,14A, 14B …… Case, 15 …… Case top header, 1
6 ... Heat transfer tube, 17 ... Hydrogen storage alloy, 18a, 18a1,18a2,18
b, 18b1,18b2 …… Piping, 19 …… Filter, 20,20a, 20b…
… Piping, 22a-22c, 23-30 …… solenoid valve.

Claims (2)

[Claims] 1. A case in which a hydrogen storage alloy that releases or adsorbs hydrogen gas due to temperature changes is housed outside a rotating electric machine cooled by hydrogen gas, and a cooling medium is provided in a stator winding of the rotating electric machine in this case. In addition to connecting the piping for introducing the hydrogen gas circulation system in the machine to connect the piping for flowing in and out the hydrogen gas to provide a valve in the middle of each pipe, in the flow passage formed in the case When adjusting the in-machine hydrogen gas pressure according to load fluctuations by flowing in and out a cooling medium for cooling the stator windings of the rotating electric machine to cool or heat the hydrogen storing alloy, the rotating electric machine is used as the hydrogen storing alloy. Supply temperature of the cooling medium flowing into the stator winding of the rotating electric machine when the hydrogen equilibrium pressure is equal to or higher than the upper limit of the regulated pressure inside the machine at the discharge temperature of the cooling medium flowing out from Select a hydrogen storage alloy whose hydrogen equilibrium pressure of the hydrogen storage alloy is less than or equal to the adjustment pressure lower limit in the machine and keep the gas pressure in the case above the adjustment pressure upper limit or below the lower limit, depending on load fluctuations. A method for adjusting hydrogen pressure in a hydrogen-cooled rotating electric machine, comprising: opening and closing the valve to adsorb hydrogen gas to adjust the hydrogen gas pressure inside the machine. 2. A plurality of cases are provided which are connected to a hydrogen gas circulation system inside the machine and an inflow / outflow system of a cooling medium for cooling a stator winding of a rotary electric machine. The method for adjusting hydrogen pressure in a hydrogen-cooled rotary electric machine according to claim 1, wherein the method is adapted to cope with fluctuations.