JPH0360350A - Cooling water equipment for gas cooling rotary electric machine - Google Patents

Abstract

PURPOSE:To detect leakage gas exactly and enable the leakage gas to be collected with safety by detecting the gas leaking into cooling water with a gas leakage detector, and by collecting the gas with a gas collecting device. CONSTITUTION:An internal-section air discharging pipe 9a fitted on a storage water tank 3 has an airtightly sealing section 10. The sealing section is formed with sealing solution which is put in the internal-section air discharging pipe 9a. The pipe 9a is branched into two at the sealing section 10, and the one side communicates with air via a valve 17a, and the other side is connected to a gas leakage detector 18 via a valve 17b. Besides, the outlet side of the gas leakage detector 18 is branched into two, and the one side communicates with the air by an external section air discharging pipe 9b via a valve 17c, and the other side is connected to a gas collecting device 19 via a valve 17d. As a result, leakage gas due to the breakage of a cooling water equipment is exactly detected, and an abnormal state can be immediately recognized, and the safety of the equipment can be contrived.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to cooling water equipment for a gas-cooled rotating electric machine, and in particular, when the cooling water equipment is damaged and gas leaks, the gas The present invention relates to cooling equipment for a gas-cooled rotary electric machine that can accurately detect leakage and reliably recover leaked gas.

(Prior Art) Gas-cooled rotating electric machines such as generators or motors generally have hydrogen gas sealed inside the machine and circulate this hydrogen gas within the machine using a rotor fan to cool the rotor and stator. . In addition, for large gas-cooled rotating electric machines,
High-purity water is passed through the stator conductors to cool them.

FIG. 3 shows a conventional gas-cooled rotating electric machine.

As shown in FIG. 3, the gas-cooled rotating electric machine 1 includes a stator conductor 2. As shown in FIG. Further, a water storage tank 3, a pure water pump 4, and a heat exchanger 5 are sequentially connected to form a cooling water facility for a gas-cooled rotating electric machine.

That is, by operating the pure water pump 4, the water storage tank 3
The pure water inside is sent to a heat exchanger 5, cooled by this heat exchanger 5, and then introduced into a header 8a inside the machine through a water supply pipe 6a. Thereafter, pure water is branched from the insulating hose 7a and fed into the stator conductor 2. Then, the pure water whose temperature has increased by cooling the conductor while dissipating the heat generated by the stator conductor 2 is similarly circulated to the water storage tank 3 via the insulating hose 7b, the header 8b, and the drain pipe 6b. During normal operation of such cooling water equipment, the in-machine gas pressure is normally maintained higher than the pure water pressure inside the stator conductor. Therefore, if a minute crack occurs in the circulation path inside the machine of the cooling water equipment, for example, if cracks occur in the many brazed parts provided at the end of the stator conductor 2, Instead of pure water gushing out,
Conversely, hydrogen gas will enter the pure water in the circulation path inside the aircraft. For this reason, serious accidents such as cracks in the internal circulation path are currently detected based on the amount of hydrogen gas consumed.

However, this is not a direct horizontal use method, and the increase in hydrogen gas consumption may be due to a malfunction in the shaft hydrogen seal or other causes, so it can be determined immediately whether or not a crack has occurred in the circulation path inside the machine. In many cases, this is not possible.

On the other hand, as a method of directly detecting hydrogen gas, there is a method of attaching a sensor of a hydrogen gas detector to the water storage tank 3. However, there is a problem in that the sensor of the detector is very sensitive to moisture.

In addition, if a material such as fluororesin is used for the insulating hoses 7a and 7b located inside the machine, hydrogen gas will penetrate into the pure water from this part and will eventually accumulate in the upper part of the water storage tank 3. I'll come. An atmosphere discharge pipe 9 is attached to this water tank 3, and this atmosphere discharge pipe 9 has an air seal portion 10 to isolate it from the atmosphere. Therefore, the hydrogen gas concentration in the upper part of the water tank 3 increases with the passage of time.

However, the hydrogen gas concentration in the upper part of the water storage tank 3 is reduced due to the temporary destruction of the air seal part 10 due to an increase in vapor pressure in the water storage tank 3, the accompanying release of gas into the atmosphere release pipe, and the liquid level due to changes in operating conditions. It is not constant due to fluctuations, etc. For this reason, even if a detector sensor is attached to the upper part of the water tank 3, it is difficult to determine whether or not the circulation path is damaged.

In addition, as another method for detecting abnormal leakage of hydrogen gas,
It is conceivable to install a hydrogen gas detector in the middle of the atmosphere discharge pipe outside the air seal part of the water tank. However, in this case the insulating hose 7a.

Hydrogen gas that permeates into the pure water in the circulation path from 7b and is discharged from the water storage tank 3 through the atmosphere discharge pipe 9 tends to stay in the atmosphere discharge pipe 9. There is a problem that the hydrogen gas detector operates even though there is no hydrogen gas.

(Problems to be Solved by the Invention) As described above, when a hydrogen gas detector is installed in the water storage tank 3, there is a problem that the sensor dislikes moisture. Also,
Since the concentration of hydrogen gas in the water storage tank changes depending on operating conditions, etc., it is difficult to accurately determine whether or not the circulation path has been damaged.

Furthermore, even when a hydrogen gas detector is attached to the atmosphere discharge pipe 9, hydrogen gas tends to remain in the atmosphere discharge pipe 9, making it difficult to determine whether or not there is an abnormal leakage of hydrogen gas.

The present invention has been made in consideration of these points,
In the event that cooling water equipment is damaged and gas leaks, this leak can be detected quickly and accurately.
The purpose is to provide cooling water equipment for gas-cooled rotating electric machines that can safely recover leaking gas.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a gas-cooled rotary electric machine that is equipped with a water storage tank to which an air discharge pipe is attached as an air seal portion, and that circulates cooling water within the conductor of the gas-cooled rotary electric machine. In the cooling water equipment, a gas leak detection device is provided in the atmosphere discharge pipe downstream of the air seal portion, and a gas recovery device is connected to the gas leak detection device.

(Function) According to the present invention, when the cooling water equipment in the gas-cooled rotating electrical machine is damaged, the gas in the rotating electrical machine leaks into the cooling water and remains in the water tank. This retained gas is guided from the air seal portion to the gas leak detector via the atmosphere discharge pipe, where gas leakage is detected and recovered by the gas recovery device.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 and 2 are diagrams showing an embodiment of a gas-cooled rotating electric machine according to the present invention. Note that the same parts as in the prior art are given the same reference numerals and detailed explanations are omitted.

The cooling water equipment for the gas-cooled rotating electric machine is configured by sequentially connecting a water tank 3, a pure water pump 4, and a heat exchanger 5, as in the conventional example.

Further, an internal atmosphere discharge pipe 9a is attached to the water storage tank 3, and this internal atmosphere discharge pipe 9 has a seal portion 10 to isolate it from the atmosphere. This seal 10 is made of a sealing liquid filled in the internal atmosphere discharge pipe 9. The internal atmosphere discharge pipe 9a branches into two at the seal portion 10, one of which communicates with the atmosphere via a valve 17a, and the other connected to a gas leak detection device 18 via a valve 17b. moreover,
The outlet side of this gas leak detection device 18 is branched into two, one communicating with the atmosphere via an external atmosphere discharge pipe 9b via a valve 17c, and the other connected to the gas recovery device 19 via a valve 17d. .

The gas leak detection device 18 includes a hydrogen storage alloy 11, a cooling fan 12 for cooling the heat generated when the hydrogen storage alloy 11 absorbs hydrogen gas, and a cooling fan 12 for releasing the hydrogen gas absorbed and accumulated in the hydrogen storage alloy 11. It has a built-in heater 13.

In addition, the hydrogen storage alloy 11 of the gas leak detection device 18 includes:
A temperature sensor 14 is connected, and this temperature sensor 14
An analyzer 15 and an alarm 16 are sequentially connected to the analyzer 15 and the alarm 16.

Next, the operation of this embodiment having such a configuration will be explained.

First, during normal operation, the valves 17a and 17d are closed. In this state, if a crack occurs in the circulation path of the cooling water equipment of the gas-cooled rotating electrical machine, hydrogen gas will continuously flow into the pure water in the circulation path, and this flowing hydrogen gas will remain in the water storage tank 3. As a result, the pressure inside the water tank 3 increases. Therefore, the sealing liquid in the air seal part 10 is released from the internal atmosphere discharge pipe 9.
At the time when the difference between the internal pressure of the water storage tank 3 and the atmosphere exceeds the liquid column pressure of the sealing liquid in the air sealing part 10, that is, at the time when the sealing liquid is discharged from the internal atmosphere discharge pipe 9a, the air sealing part 10 is instantaneously destroyed, and the hydrogen gas in the water tank 3 is released into the gas leak detection device 18. When hydrogen gas is fed into the gas leak detection device 18, the hydrogen storage alloy 11 absorbs the hydrogen gas and generates heat.

During this time, the cooling fan 12 inside the hydrogen gas leak detection device 18
is operated continuously to cool the heat generated when the hydrogen storage alloy 11 absorbs hydrogen gas. At the same time, the impure gas sent together with the hydrogen gas is discharged to the atmosphere from the external atmosphere discharge pipe 9b. After the hydrogen gas in the water tank 3 is released, the air seal portion 10 and the inside of the water tank 3 return to their original states.

If such abnormal leakage of hydrogen gas continues, hydrogen gas will continue to accumulate in the water tank 3, the pressure in the water tank 3 will rise again in a short time, and the destruction operation of the air seal portion 10 will be repeated. . In this case, since the amount of hydrogen gas absorbed by the hydrogen storage alloy 11 increases in a short period of time, the temperature of the hydrogen storage alloy due to the generated heat also rises rapidly, and the cooling fan 12 is unable to suppress this temperature rise. This state is shown in FIG.

FIG. 2 shows the temperature rise caused by the heat generated in the hydrogen storage alloy 11.

The temperature rise of the hydrogen storage alloy 11 is detected by the temperature sensor 14, and if the temperature rise value in a predetermined time exceeds the set value, the analyzer 15 outputs an alarm number 1 to the alarm 16 to detect this abnormal condition. Inform.

Thereafter, when it is determined that a large amount of hydrogen gas has been absorbed into the hydrogen storage alloy 11 after a certain period of time has elapsed, the valves 17b and 17c are closed, and the valve 17d is opened. Next, heater 13
By heating the hydrogen storage alloy 11, hydrogen gas is released from the hydrogen storage alloy 11. The hydrogen gas thus released is sent to one gas recovery device via the valve 17d, and the hydrogen gas is periodically recovered by this gas recovery device 19.

As described above, according to this embodiment, when an abnormal leak of hydrogen gas occurs in the circulation path in the gas-cooled rotating electrical machine, the temperature of the hydrogen storage alloy 11 rises rapidly, and this temperature rise is detected by the temperature sensor 14. At the same time, the alarm 16 notifies the user of this abnormal condition, so that leakage of hydrogen gas can be reliably detected. Moreover, since the hydrogen gas absorbed by the hydrogen storage alloy 11 can be periodically recovered by the gas recovery device 19, the safety of the equipment can be improved.

In the above embodiment, an example of cooling water equipment in which cooling water was circulated within the conductor 2 of the stator was shown as a cooling water equipment for a gas-cooled rotary electric machine. However, the present invention is not limited to this. It may also be a cooling water facility that circulates cooling water.

〔Effect of the invention〕

As explained above, according to the present invention, when the cooling water equipment in the gas-cooled rotating electric machine is damaged, the gas leaking into the cooling water is detected by the gas leak detector, and is also detected by the gas recovery device. It will be collected. Therefore, gas leakage due to damage to the cooling water equipment can be accurately detected, abnormal conditions can be immediately recognized, and the safety of the equipment can be improved.

[Brief Description of the Drawings] Fig. 1 is a schematic system diagram showing an example of the gas cooling water equipment according to the present invention, Fig. 2 is a diagram showing the temperature rise of the hydrogen storage alloy, and Fig. 3 is a diagram showing the temperature rise of the hydrogen storage alloy. 1 is a schematic system diagram showing a conventional gas cooling water facility. 1... Gas-cooled rotating electric machine, 2... Stator conductor, 3...
...Water tank, 4...Pure water pump, 5...Heat exchanger,
9a... Internal atmosphere release pipe, 9b... External atmosphere release tube, 10... Seal portion, 11... Hydrogen storage alloy, 12
...Cooling fan, 13... Heater, 14... Temperature sensor, 15-... Analyzer, 16-... Alarm, 17a
, 17b. 17c, 17d... Valve, 18... Gas leak detection device, 19... Gas recovery device.

Claims (1)

[Scope of Claims] 1. A cooling water equipment for a gas-cooled rotating electrical machine that includes a water storage tank to which an atmospheric discharge pipe having an air seal is attached and circulates cooling water within the conductor of the gas-cooled rotating electrical machine, wherein the air seal section A cooling water facility for a gas-cooled rotating electric machine, characterized in that a gas leak detection device is provided in the atmospheric discharge pipe on the downstream side, and a gas recovery device is connected to the gas leak detection device. 2. The cooling water equipment for a gas-cooled rotating electric machine according to claim 1, wherein the gas leakage detection device includes a hydrogen storage alloy and a temperature sensor that detects a temperature rise of the hydrogen storage alloy.