JPS6048616B2 - gas turbine generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas turbine power generator, and more particularly to a ventilation cooling system for a gas turbine power generator equipped with an open air cooling type gas turbine generator.

The bearing room of a gas turbine is at high temperature (400°C).
Since the bearing room is located adjacent to the exhaust gas exhaust pipe of the This may cause misalignment or burnout of the lead wire of the thermocouple for measuring exhaust temperature.

Therefore, in the past, for example, warm cooling air after cooling the gas turbine generator and the reduction gear was supplied into the bearing room to cool parts such as the bearings. First, such a conventional gas turbine power generation device will be explained with reference to FIGS. 1 and 2.

These figures are a plan view and a side view showing the ventilation passage of the gas turbine generator as a model. 1 is the outer cover of the gas turbine generator, 2 is the popular part having the popular port 3 and the air filter 4, and 5 is the popular part having the air filter 4. A base, 6 is a wind barrel inside the base, 7 is a stator frame of a gas turbine generator, 8 is a generator body housed within the stator frame, and a fan 9 is provided on the rotor thereof.

10 is a silencer, 11 is an exhaust duct, and 12 is a gear room, in which a reduction gear box 13 is housed.

14 is the outer jacket of the gas turbine, 15 is the bearing room (load coupling room or
16 is an exhaust port thereof, 17 is a gas turbine bearing housed in the bearing room 14, 18 is a load coupling, 19 is a partition wall between the gear room 12 and the bearing room 15, and 20 is an exhaust gas The exhaust pipe, 21 is a heat shielding wall between the bearing room 15 and the exhaust gas exhaust pipe, and 22 is a thermocouple.

The cooling air is generated by the generator fan 9 as shown by the arrow.
Enters the popular part 2 through the air filter 4 from the popular port 3,
From here, it is guided into the stator frame 7 via the wind cylinder 6 in the base, where the generator main body 8 is cooled, and then reached from the silencer 10 to the exhaust duct 11, and further into the gear room 12.
to go into.

The cooling air introduced into the gear room 12 cools the gear box 13 and then enters the bearing room 15, further cooling the bearings 17 etc. stored therein.
It is discharged outdoors from the exhaust port 16. By the way, such a conventional gas turbine power generation device has the following problems.

(1) The cooling air introduced into the bearing room 15 is
Since the turbine generator main body 8 and gear box 13 are already cooled and heated to a fairly high temperature, the cooling effect is not sufficient despite the large amount of ventilation (approximately 700 min). As mentioned above, problems such as burnout of bearing metal and charcoal burning of lubricating oil often occurred.

(2) Since hot exhaust air after cooling the generator main body 8 passes through the gear room 12, the work environment for maintenance personnel during operation is extremely poor, resulting in extremely poor reviews from customers. (3) Immediately after the gas turbine stops, the exhaust gas exhaust stack 2
Since the hot air in the bearing room 1; 5 heated by the residual heat of the bearing room 1 enters the gear room 12, a problem similar to the above (2) occurs.

Therefore, as shown in FIGS. 3 and 4, a ventilation cooling system has been proposed in which the ventilation cooling system for the generator main body 8 and the ventilation cooling system for the gear room 12 and bearing room 15 are separated.

That is, the exhaust duct 11 is provided with an exhaust port 23, and the cooling air that reaches the exhaust duct 11 after cooling the generator body 8 is discharged outdoors from the exhaust port 23 without being guided to the gear room 12. Sa3. It will be done.

On the other hand, the gear room 12 is provided with a popular port 24 and a ventilation fan 25 is attached to the partition wall 19, and the cooling air sucked into the gear room 12 from the popular port 24 by the ventilation fan 25 cools the gear box 13. Thereafter, as shown by the arrow, the air is blown out into the 4ι bearing room 15, further cooling the bearings 17 and the like stored therein, and then being discharged outdoors from the exhaust port 16. According to this ventilation cooling method, the temperature of the cooling air flowing into the bearing room 15 is lower than that of the conventional example, so the temperature inside the gear room 12 is reduced, which has a large cooling effect even though the amount of ventilation is small. is much lower than that of the conventional example,
Benefits include a significantly improved working environment for maintenance personnel.

However, on the other hand, it had the following drawbacks.

(1) Since the ventilation fan 25 is attached, the cost increases accordingly.

(2) As shown in Fig. 3, two ventilation fans 25 are provided on both sides of the drive shaft, but it is difficult to balance them and complete startup.For example, if one ventilation fan completes startup first, In response to the wind pressure, the other ventilation fan either rotates in the opposite direction or fails to start at the same time and is rotated at low speed for a long period of time, causing the problem that its drive motor may burn out.

To solve this problem, it is necessary to use an expensive drive motor with excellent starting characteristics. (3) Processing must be performed to attach the ventilation fan 25 to the partition wall 19 that partitions the bearing room 15 and the gear room 12 of the gas turbine, making the structure complicated and expensive.

(4) Since the bearing room 15 and the gear room 12 are in communication through the ventilation fan 25 section, when the gas turbine is stopped, the hot air in the bearing room 15 flows back into the gear room 12, causing the lead wires of the ventilation fan drive motor to burn out. A problem occurs.

The object of the present invention is to eliminate the drawbacks of the prior art described above, and to provide a simple structure without requiring a ventilation fan. To provide a gas turbine power generation device which is inexpensive and provides a good working environment in the gear room by effectively cooling bearings in a ring room and gearbox in the gear room.

In order to achieve this object, the present invention provides a ventilation passage that directly guides a portion of the cooling air that has been inserted into the stator frame of the gas turbine generator into the non-grooming room before cooling the starter body. At the same time, we installed a popular outlet at the bottom of the room and an exhaust outlet at the top, allowing natural convection to open the lower popular outlet. It is characterized by sucking new cooling air into the gear room to cool the gears and then exhausting it from the upper exhaust port. An embodiment of the present invention will be described below with reference to FIG.

In FIG. 5, the same reference numerals as in FIGS. 1 to 4 indicate the same or equivalent components. In this embodiment, the ventilation fan 25 in the conventional example shown in FIGS. 3 and 4 is omitted, and instead, the generator main body 8, which is introduced into the stator frame 7 of the gas turbine generator, is cooled. In order to direct part of the previous cold cooling air directly to the bearing room 15, the cooling air passage 26 passes through the base 5 from the lower part of the stator frame 7, and is bent upward just before reaching the partition wall 19.
It penetrates the inside of the gear room 12 and opens at the lower part of the inside of the bearing room 15.

Therefore, during operation, a part of the cooling air for the generator main body 8 is guided to one side below the bearing room 15 through the ventilation pipe 26 by the head of the fan 9 of the rotor.
It is discharged outdoors from the upper exhaust port 16 while cooling the inside. Since the cooling air for the generator main body is cold air having the same temperature as the outside temperature, a very small amount of about 5% of the generator main body cooling air volume is enough to perform its cooling function. 2 Oh,
Although the amount of cooling air for the generator main body is reduced by that amount, the temperature increase of the cooling air due to this is about 1.5 degrees, and the effect on the cooling of the generator main body can be ignored. Also,
Due to the omission of a ventilation fan, inside the gear room 12. In order to provide ventilation and cooling, the air intake port 24, which was conventionally provided above the gear room 12, has been moved downward, and an exhaust port 27 is provided above.

Therefore, due to natural convection, new cold cooling air is sucked into the gear room 12 from the lower popular port 24, cools the gear box 13, and then flows to the upper exhaust port 27.
is discharged outdoors. According to this embodiment, the following effects can be obtained.

(1) Since the coldest cooling air, which is the same as the outside temperature, can be supplied into the bearing room 15, the inside of the bearing room 15 can be effectively cooled with the minimum amount of ventilation.

(2) Since the bearing room 15 and the gear room 12 are completely separated by the partition wall 19, the hot air inside the bearing room 15 will not flow back into the gear room 12 when the gasta J-pin is stopped. (3) The inside of the bearing room 15 and the inside of the stator frame 7 are communicated through the ventilation pipe 26, so that when the gas turbine is stopped, the inside of the bearing room 1
There is a risk that the hot air in the bearing room 15 will flow back into the stator frame 7, but since the hot air in the bearing room 15 has the property of rising upward as an upward current, this property is utilized as in this embodiment. This can be prevented by bending the end of the ventilation pipe 26 on the bearing room 15 side upward.

(4) The working environment inside the gear room 12 can be maintained in an optimal state. (5) Simply installing the ventilation pipe 26 eliminates the need for a ventilation fan, and the structure of the partition wall becomes simple.
Significant cost reductions can be achieved.

(6) Conventionally, when entering the gear room 12 during operation, the noise from the gas turbine side was directly transmitted through the gap (or window) with the bearing room 15, which was very unpopular. Since it can be completely partitioned with solid walls, this noise can be blocked out. As explained above, according to the present invention, a part of the cold cooling air introduced into the stator frame of the gas turbine generator before cooling the generator body is effectively used to ventilate the bearing room. In addition to cooling, the inside of the gear room is also ventilated and cooled by fresh cooling air sucked in through natural convection, which eliminates the need for conventional ventilation fans and allows the bearings inside the bearing to be cooled. etc., the gear box in the gear room can be effectively cooled, this type of gas turbine power generator can be manufactured at low cost, and a good working environment in the gear room can be maintained.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view modeling a ventilation passage of an example of a conventional gas turbine power generation device, Fig. 2 is a schematic side view of the same, and Fig. 3 is a ventilation passage of another example of a conventional gas turbine power generation device. FIG. 4 is a schematic side view of the same, and FIG. 5 is a schematic side view of the modeled ventilation passage of a gas turbine generator/electric power device according to an embodiment of the present invention. be. 1... Outer cover of gas turbine generator, 2... Popular part, 6... Base inner wind barrel, 7... Stator frame of gas turbine generator, 8... Generator main body, 9...・・・
Fan, 12... Gear room, 13... Gear box, 15... Gas turbine bearing room, 24
...popular port, 26...ventilation pipe, 27...exhaust port.

Claims (1)

[Claims] 1. A gas turbine having a bearing room that houses a bearing that is cooled by ventilation, a gas turbine generator that is directly connected to this gas turbine and is cooled by ventilation, and a gas turbine that is located between these gas turbines and the gas turbine generator and that is and a gear room housing a gear box to be cooled, wherein a part of the cooling air introduced into the stator frame of the gas turbine generator before cooling the generator body is directly connected to the bearing room. At the same time, an inlet is provided at the bottom of the gear room, and an exhaust port is provided at the top of the gear room, and new cooling air is sucked into the gear room from the lower inlet by natural convection, cooling the gear box, and then moving upward. A gas turbine power generation device characterized in that the gas is discharged from an exhaust port.