JPH051634Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is installed in a gas turbine power generation device to discharge exhaust gas from the gas turbine, and is also used in a gas turbine and a generator driven by the gas turbine. This invention relates to an exhaust system that ventilates the air of a power generation device that houses a generator.

[Conventional technology]

Conventionally, in a gas turbine power generator equipped with an enclosure, etc., the exhaust device shown in Fig. 3 and Fig. 4 is used to discharge the cooling air of the generator and lubricating oil cooler and the exhaust gas of the gas turbine to the outside. Are known.

That is, in the system shown in FIG. 3, an exhaust muffler 3 is connected to a gas turbine 2 that drives a generator 1, and a ventilation fan 5 is provided to a generator 4 that houses the generator 1 and the gas turbine 2. The exhaust gas from the gas turbine 2 and the power generator 4 are ventilated separately by connecting the ventilation duct 6. In addition, the code|symbol 7 is a lubricating oil cooler.

In addition, in the one shown in FIG. 4, an exhaust silencer 3 is connected to the power generation device 4, and an ejector section 8 for spouting exhaust gas from the gas turbine 2 is connected to the power generation device 4. The ejector section 8 is provided with an opening in the communication passage 9, and the air inside the power generating device 4 is sucked in by the exhaust gas vigorously jetted from the ejector section 8, and is discharged to the outside together with the exhaust gas.

[The problem that the idea aims to solve]

However, the exhaust system in Figure 3
It is necessary to provide the exhaust muffler 3 separately from the exhaust muffler 3 by penetrating the building wall, and there is a problem that the overall structure is complicated. The one shown in Fig. 4 does not require the ventilation duct 6 as shown in Fig. 3 and has the advantage of being simple and economical in structure, but since it utilizes the ejector effect at the gas turbine outlet, There are the following problems.

Exhaust gas tends to flow back into the power generation device 4 when the gas turbine is started or stopped, and the radiant heat of the exhaust gas during operation raises the temperature of equipment in the power generation device 4, causing problems in terms of the lifespan and maintenance of the devices.

Since the noise of the exhaust gas leaks into the power generation device 4 through the gap between the ejector portion 8 and the communication passage 9, the inside of the power generation device 4 is very noisy.

Since it is necessary to reduce the gas passage resistance of the exhaust muffler 3, the exhaust muffler 3 tends to be larger than the gas flow rate.

In order to enhance the silencing effect of the exhaust silencer 3, it is necessary to adopt a ventilation method using a ventilation fan.

The present invention provides an exhaust system that is simple in structure and easy to implement, and is highly safe and reliable since there is no backflow of exhaust gas into the power generator or the influence of radiant heat when the power generator is started or stopped. The purpose is to provide.

[Means to solve the problem]

In order to achieve the above object, the present invention connects an exhaust muffler to a gas turbine that drives a generator, connects a ventilation duct to a power generation device that houses the generator and gas turbine, and also An ejector part that blows out the exhaust gas of the gas turbine at the end of the container, sucks in the air from the power generation equipment, and releases it to the outside together with the exhaust gas is connected to the ventilation duct by opening into the ventilation duct. .

[Effect]

Exhaust gas generated by the operation of the gas turbine that drives the generator is discharged into the exhaust muffler, where it is muffled, and then vigorously ejected from the ejector section provided at the end of the exhaust muffler. . At this time, since the exhaust silencer is directly connected to the gas turbine, the exhaust gas does not flow back into the power generation equipment when the gas turbine starts or stops, and the radiant heat of the exhaust gas is used to protect the equipment inside the power generation equipment. is not heated. Air inside the power generator is sucked through the ventilation duct by the exhaust gas ejected from the ejector section, and is discharged to the outside together with the exhaust gas. Here, since the ejector section is provided at the terminal end of the exhaust muffler and is opened to the ventilation duct, the noise of the exhaust gas does not directly leak to the power generator.

〔Example〕

FIG. 1 shows an embodiment of an exhaust system in a gas turbine power generator according to the present invention, and reference numeral 11 in the figure indicates a gas turbine. gas turbine 11
is for driving the generator 12 to generate electricity, and is housed in the power generation device 13 together with the generator 12.
An exhaust muffler 15 is flanged to the exhaust port 11a of the gas turbine 11 via an intermediate duct 14, and a first ventilation duct 16 is flanged to the power generation device 13. A second ventilation duct 17 formed integrally with the exhaust muffler 15 is flanged to 16, and an exhaust pipe 18 is further flanged to the second ventilation duct 17. Note that this exhaust pipe 18
can also be used as a second muffler.

In addition, the exhaust silencer 15 and the second ventilation duct 1
An ejector part 19 is provided on the partition wall 15a between the
is provided at the end of the second ventilation duct 17 with its free end open. The ejector section 19 is for vigorously blowing out exhaust gas and sucking out the air inside the power generating device 13 by an ejector effect. The power generation device 13 is provided with an air intake port 13a for the gas turbine 11, and air ports 13b and 13c for supplying air to the lubricating oil cooler 20 and the generator 12.
The power generation equipment itself is well known.

The reference numeral 21 is a ventilation fan installed in the first ventilation duct 16, and normally, as mentioned above, the exhaust pipe 18 is configured as a second muffler, so that the pressure loss is large and the ejector effect is insufficient. However, this is not always necessary and can be omitted.

Next, the operation of the exhaust system of the present invention constructed as described above will be explained.

When the gas turbine 11 is operated, outside air is sucked into the gas turbine 11 from the air intake port 13a, and the fuel is combusted and becomes exhaust gas.
It is discharged into the exhaust muffler 15 from 1a. The generator 12 is driven by the operation of the gas turbine 11 to generate electricity, and at this time, outside air is taken in from the air ports 13b and 13c, cools the lubricating oil cooler 20 and the generator 12, and flows into the power generator 13. do.

The exhaust gas discharged from the exhaust port 11a of the gas turbine 11 to the exhaust muffler 15 is
The sound is muffled inside and ejected from the ejector part 19,
An ejector effect is generated to create a negative pressure around the mouth of the ejector part 19. On the other hand, the air that has flowed into the power generator 13 is sucked in by the ejector effect of the exhaust gas, and is discharged to the outside through the exhaust pipe 18 together with the exhaust gas.

Note that the exhaust gas flow rate and the diameter and length of the exhaust pipe 18, which affect the ejector effect, are determined depending on noise conditions, and an example thereof is as follows.

a Exhaust gas flow rate; approximately 60 m/sec b Ratio of diameters of ejector section 19 and exhaust pipe 18;
1.6 to 2.1 c Length of exhaust pipe 18: 0.5 m or more d Ejector effect: Approximately 40 mmAq (However, measurement is made with the flange of the first ventilation duct 16 closed) Figure 2 shows the first ventilation duct 16 and the second ventilation duct 17, a movable flange 24 provided with a packing 23 is provided on the first ventilation duct 16, and the movable flange 24 is screwed into a nut member 25 of the first ventilation duct 16 with a jack bolt 26. Press the gasket 23 to the fixed flange 27 fixed to the second ventilation duct 17 by pushing it to the right in FIG.
6 and a second ventilation duct 17 is connected to the second ventilation duct 17.

In the above configuration, the vertical expansion and contraction of the exhaust muffler 15 due to heat is absorbed by the vertical movement of the fixed flange 27 relative to the packing 23, and the vibration of the exhaust muffler 15 is absorbed by the packing 23. Moreover, since the movable flange 24 can be moved by adjusting the jack bolts 26 to absorb dimensional errors, installation and assembly are facilitated.

[Effect of idea]

As explained above, in the exhaust system of the gas turbine power generator according to the present invention, an exhaust muffler is connected to the gas turbine that drives the generator, and a ventilation duct is connected to the power generator that houses the generator and the gas turbine. At the same time, an ejector part that blows out the exhaust gas of the gas turbine at the terminal end of the exhaust muffler, sucks in the air of the power generation equipment, and releases it to the outside together with the exhaust gas is opened and connected to the ventilation duct. Since the exhaust muffler is directly connected to the gas turbine without any gaps, the exhaust gas will not flow back into the power generator when the gas turbine is started or stopped. Furthermore, since the radiant heat of the exhaust gas does not directly irradiate the equipment in the power generator and heat them, there is no problem with the lifespan or maintenance of the equipment. Furthermore, since the ejector section is installed at the end of the exhaust silencer and opens into the ventilation duct, the noise of the exhaust gas does not directly leak into the power generator, making maintenance easier. It has the advantage of being applicable to low-noise silencers due to the magnitude of pressure loss. Furthermore, since only the exhaust gas passes through the exhaust muffler, there is no need to make it large, and the overall structure can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of an exhaust system in a gas turbine power generation apparatus according to the present invention, and FIG. 2 is a cross-sectional view showing an example of a joint structure of a first ventilation duct and a second ventilation duct. FIG. 3 is a sectional view of a conventional exhaust system, and FIG. 4 is a sectional view of another conventional exhaust system. 11... Gas turbine, 12... Generator, 13
...Power generator, 15...Exhaust silencer, 16,17
...Ventilation duct, 19...Ejector section.

Claims (1)

[Scope of utility model registration request] An exhaust muffler is connected to a gas turbine that drives a generator, a ventilation duct is connected to a power generation device that houses the generator and the gas turbine, and exhaust gas from the gas turbine is ejected to a terminal end of the exhaust muffler. 1. An exhaust system for a gas turbine power generator, characterized in that an ejector section that sucks air from the power generator and releases it to the outside together with exhaust gas is opened and connected to the ventilation duct.