JPH0331900B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to improvements in regenerative gas turbines.

(Prior art) For example, there is a gas turbine for automobiles as shown in Fig. 4 (Complete book of automotive engineering, Volume 6, Rotary engine, gas turbine... Sankaido, 1972)
Published on January 20, 2017). This is called a two-shaft regenerative gas turbine, in which fuel injected from a fuel injection nozzle is combusted in a combustor 2 together with compressed air from a compressor 1 to generate high-temperature gas, which is then passed through a scroll 3 and a gas passage 4. As a result, the turbine (compressor drive turbine) 5 that drives the compressor 1 and the turbine (output turbine) 6 that obtains the engine output are rotated, and the exhaust gas that drives the output turbine 6 is then transferred to a rotary heat storage system. The compressed air sent from the compressor 1 to the combustor 2 is heated.

(Problems to be Solved by the Invention) By the way, in such a gas turbine, the temperature of the high-temperature gas is 1000°C or higher, and the temperature of the compressed air passing through the heat exchanger 7 is 900°C or higher. ,
To prevent heat transfer to the outside, some housings (not shown) that house gas turbines have a heat insulating material on the inside (General Motors' AGT-
100) Ceramic materials such as alumina, silica, and glass ceramics are used as this heat insulating material, and are applied by coating or adhering molded bodies.

However, when applying ceramics,
Construction takes a lot of time and it is difficult to achieve a certain level of quality. Molded ceramics are expensive and sensitive to vibrations and the like. Another problem was that the surface of the heat insulating material was worn away by erosion during use, and the worn pieces further eroded other parts.

Another problem was that the vicinity of the seal of the heat exchanger 7 was thermally deformed by the high-temperature gas, resulting in poor sealing performance and a reduction in the output of the gas turbine.

(Means for Solving the Problems) This invention includes a combustor to which high-pressure air is supplied from a compressor, a turbine driven by high-temperature gas from the combustor, and a combustor to which high-pressure air is supplied from the compressor to the combustor. In a regenerative gas turbine equipped with a rotary regenerative heat exchanger that preheats high-pressure air with turbine exhaust gas, and which is housed in a housing, the housing is formed into a double structure, with an outer shell and an inner shell. An air passageway is formed between the heat exchanger and the heat exchanger for guiding high-pressure air from the compressor to the heat exchanger, and the air passageway is opened to a seal mounting surface of the heat exchanger.

(Function) The housing is forcibly cooled by high-pressure air from the compressor passing through the air passage, which prevents heat transfer to the outside without using ceramic insulation, and also prevents heat transfer. Since the area near the seal of the exchanger is cooled by the air discharged from the air passage, deterioration of sealing performance due to thermal deformation is also prevented.

(Embodiment) FIG. 1 is an exploded perspective view of essential parts showing an embodiment of the present invention, showing a housing 8 of a regenerative gas turbine.

This housing 8 is adapted to accommodate each of the components shown in FIG.
However, on the rear side, there is an output shaft 1 connected to an output turbine 6.
Two shaft holes 13 are formed.

An annular step 14 is formed on the upper surface of the housing 8 to which a rotary regenerative heat exchanger 7 is attached, and a double bulkhead 15 is formed in the center of the housing 8 to which a compressor drive turbine 5 and an output turbine 6 are attached. formed on the front.

Antechamber 1 partitioned by this bulkhead 15
6 is provided with a combustor 2 and a scroll 3 that guides high-temperature gas from the combustor 2 to a turbine 5, and a rear chamber 17 is provided with a diffuser 18 that guides exhaust gas from the turbine 6 to a heat exchanger 7. It is becoming more and more common.

In this embodiment, the housing 8 is used as an outer shell 19, and thin inner shells 20, 21 are provided in the front chamber 16 and rear chamber 17 of the housing 8, respectively, so that the housing 8 has a double structure.

The inner shell 20 has almost the same shape as the wall surface 23 of the front chamber 16, and is formed with a predetermined gap between the inner shell 20 and the wall surface 23, and has a cylindrical portion 24 on the front surface thereof in alignment with the flange portion 11 of the corresponding housing 8. However, there is also a semi-cylindrical part 2 on the top surface in line with the bottom edge of the annular step part 14.
5, an edge 26 is provided on the rear surface to match the periphery of the bulkhead 15. In this case, the lower part of the inner shell 20 is formed in a concave shape so that the gap with the wall surface 23 is large. However, 27 is a duct through which the combustor 2 passes.

The inner shell 21 has almost the same shape as the wall surface 28 of the rear chamber 17, and is similarly formed with a predetermined gap between it and the wall surface 28, with a larger gap at the bottom. The edge 29 is connected to the periphery of the bulkhead 15, the semi-cylindrical part 30 is connected to the bottom edge of the annular step 14 on the top surface, and the shaft hole 13 is connected to the rear surface.
A cylindrical portion 31 is provided for.

The inner shells 20 and 21 have a cylindrical portion 24 and a cylindrical portion 24, respectively.
31, the semi-cylindrical parts 25, 30 and the edges 26, 29 are welded and fixed to the corresponding parts of the housing 8.

Note that reinforcing ribs 32 are provided on the outer surfaces of the inner shells 20 and 21, and the inner shells 20 and 21 are
It may be formed by dividing into parts 3 and 34.

On the other hand, an inlet hole 37 passes through the support plate 9 of the compressor 1 and the flange portion 11 of the housing 8 and connects the discharge ports 35 and 36 of the scroll cover 10 to the gap between the inner shell 20 and the front chamber wall surface 23; An inlet hole 38 opening toward the annular step 14 is provided, and a communication hole 39 is formed in the lower part of the bulkhead 15 to connect the gap between the lower parts of the inner shells 20 and 21.

Then, the annular step part 14 is attached to the inner shells 20, 21 and the front chamber 16 on the lower surface of the annular step part 14 along the periphery thereof.
A large number of communication holes 40 are formed which connect to the gaps between the rear chamber 17 and the wall surfaces 23, 24. A communication hole 41 is also formed on the upper surface of the bulkhead 15.

The housing 8 formed in this way is
As shown in the figure. However, Fig. 2 shows a state in which the rotary heat exchanger 7 and its cover 46 are assembled, and seals 42 and 43 are provided at the periphery and center of the heat exchanger 7 to maintain airtightness. .

That is, the high pressure air sent from the compressor 1 on the front of the housing 8 flows through the inlet holes 37, 3 of the flange portion 11.
8, flows directly around the heat exchanger 7, passes through the gap between the inner shell 20 and the outer shell 19, and flows around the heat exchanger 7 from the communication hole 40 of the annular step 14, which is the seal mounting surface. be introduced.

Further, a portion of the high-pressure air passing through the gap between the inner shell 20 and the outer shell 19 flows into the gap between the inner shell 21 and the outer shell 19 from the communication hole 39 of the bulkhead 15, and enters the communication hole 40 of the annular step portion 14. and around the heat exchanger 7.

These high-pressure airs are collected on one side 44 of the heat exchanger 7, which is the fresh air introduction passage, and pass through the one side 44 of the heat exchanger 7 from the upper surface thereof to the front chamber 16 of the housing 8 where the combustor 2 is installed. It is sent to. Note that the high-pressure air that has flowed into the interior of the bulkhead 15 flows into the front chamber 16 from its upper surface.

In this way, the housing 8 is formed into a double structure,
The gap between the outer shell 19 and inner shells 20 and 21 of the housing 8 is filled with high pressure air from the compressor 1 to the heat exchanger 7.
Since the air passage 45 is configured to lead to air, the housing 8 is sufficiently cooled by the high pressure air, and also contributes to preheating of the compressed air.

Therefore, heat transfer to the outside can be prevented without using a heat insulating material such as ceramic as in the conventional example, and the housing 8 can be made compact and lightweight as a whole.

In addition, it does not wear out due to erosion unlike ceramic insulation materials, and high reliability can be obtained. Furthermore, a portion of the high-pressure air from the compressor 1 is passed through the seal of the heat exchanger 7, the entire circumference around its seating surface, and the upper surface of the bulkhead 15, so that the high-temperature sliding of the heat exchanger 7 is avoided. Seal 4
2 and 43 can be cooled, and therefore the sealing performance is not deteriorated due to thermal deformation, and the output performance of the gas turbine can be improved.

In this embodiment, the housing outer shell 19 is used as a strength member, and the inner shells 20 and 21 are further assembled. However, as shown in FIG. 3, the inner shell 47 is used as a strength member, and the outer shell 48 You may also install it.

(Effects of the invention) Good heat insulation properties can be obtained, the housing can be made smaller,
Lighter weight can be achieved. Furthermore, thermal deformation of the housing is suppressed and the sealing performance of the heat exchanger portion is improved, so that the output performance of the gas turbine is improved.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a main part showing an embodiment of the present invention, Fig. 2 is a sectional view of its configuration, Fig. 3 is a partial sectional view showing another embodiment of the invention, and Fig. 4 is a conventional gas It is a schematic block diagram of a turbine. 1...Compressor, 2...Combustor, 5, 6...Turbine, 7...Heat exchanger, 8...Housing, 19
...Outer shell, 20, 21...Inner shell, 45...Air passage.

Claims (1)

[Claims] 1 A combustor that is supplied with high air pressure from a compressor, a turbine that is driven by high-temperature gas from the combustor, and a rotary regenerative heat system that preheats the high-pressure air that is supplied from the compressor to the combustor with exhaust gas from the turbine. In the regenerative gas turbine, the housing is formed into a double structure, and the high-pressure air from the compressor is heated between the outer shell and the inner shell. A regenerative gas turbine characterized in that an air passage leading to an exchanger is formed, and the air passage is opened at a seal mounting surface of the heat exchanger.