Regenerative gas turbine

Abstract

The invention discloses a heat regeneration type gas turbine, which belongs to the technical field of gas turbines and comprises a gas compressor, a combustion chamber and a heat regenerator, the gas compressor, the combustion chamber and the heat regenerator are sequentially connected along a first direction, and the heat regenerator is provided with a hot gas inlet for hot gas to enter the heat regenerator. The heat regenerator is provided with a hot gas inlet, the hot gas inlet is formed in the end face, facing the combustion chamber, of the heat regenerator and connected with a gas outlet of the combustion chamber, and during work, high-temperature gas exhausted from the gas outlet of the combustion chamber directly enters the heat regenerator to exchange heat with cold gas and then is exhausted from the heat regenerator. The combustion chamber and the heat regenerator are connected without an additional connecting pipeline, and the heat regenerator, the gas compressor and the combustion chamber are coaxially arranged, so that the axial length and the radial size of the whole regenerative gas turbine can be reduced, the weight of the whole regenerative gas turbine can be reduced, and a higher fuel consumption rate can be obtained on the premise of a smaller overall size; and meanwhile, cold air enters and exits from the same side of the heat regenerator, the cold air passing through the heat regenerator does not need to be guided back to a combustion chamber through an additional channel structure, therefore, the structure is simple and compact, the overall dimension of the whole machine can be further shortened, and the weight of the whole machine can be further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and specifically to a regenerative gas turbine. Background Art

[0002] A gas turbine is an internal combustion power machine that uses continuously flowing gas as the working medium to drive the impeller to rotate at high speed and convert the energy of fuel into useful work. It is a rotating impeller type heat engine.

[0003] A gas turbine mainly includes a compressor, a combustion chamber, and a turbine. Its working process is as follows: the compressor sucks in air from the atmosphere and compresses the air. The compressed air enters the combustion chamber, mixes with fuel and burns to generate high-temperature gas. Then the high-temperature gas flows into the turbine to expand and do work, and the gas after driving the turbine to do work is directly discharged into the atmosphere. At this time, the temperature of the discharged gas can still reach 500°C to 700°C. In order to make full use of energy and improve work efficiency, a regenerator can be additionally installed in the gas turbine to exchange heat between the air compressed by the compressor and the gas discharged from the turbine. On the one hand, it can make full use of the exhaust waste heat of the gas turbine, and on the other hand, it can also increase the basic temperature of combustion in the combustion chamber and reduce the fuel consumption in the combustion chamber.

[0004] However, a gas turbine with a regenerative configuration generally has a complex structure, a large axial dimension, and a heavy weight. For a vehicle-mounted gas turbine, the space requirement is extremely compact. Currently, the complex structure of the gas turbine with a regenerative configuration results in a large overall volume and weight, making it not suitable for applications such as vehicle-mounted where there are high requirements for volume, weight, and fuel consumption rate.

[0005] Based on this, the present invention designs a regenerative gas turbine to solve the above problems. Summary of the Invention

[0006] The present invention provides a regenerative gas turbine to solve the technical problem that the currently regenerative gas turbine has a complex structure, resulting in a large overall volume and weight, and is not suitable for applications such as vehicle-mounted where there are high requirements for volume, weight, and fuel consumption rate.

[0007] According to one aspect of the present invention, a regenerative gas turbine is provided, which includes a compressor, a combustion chamber and a regenerator. It is characterized in that: the compressor, the combustion chamber and the regenerator are sequentially connected along a first direction. The regenerator has a hot gas inlet for hot gas to enter the regenerator, and the hot gas inlet is opened on the end face of the regenerator facing the combustion chamber, and the hot gas inlet is connected to the gas outlet of the combustion chamber. The regenerator further includes a cold gas inlet for cold gas to enter the regenerator and a cold gas outlet for cold gas to be discharged from the regenerator. Both the cold gas inlet and the cold gas outlet are opened on the end face of the regenerator facing the combustion chamber. An air flow passage is formed in the combustion chamber, and both ends of the air flow passage are respectively connected to the exhaust port of the compressor and the cold gas inlet. The air flow passage is used to introduce the cold gas discharged from the compressor from the cold gas inlet into the inner cavity of the regenerator for heating. The cold gas outlet is connected to the combustion chamber, and the cold gas outlet is used to introduce the heated cold gas into the flame tube of the combustion chamber to participate in combustion.

[0008] As a further solution of the present invention, the regenerator includes a regenerative core, and the regenerative core includes a plurality of heat exchange plates connected in sequence. The heat exchange plates include a first heat exchange plate provided with a first flow passage and a second heat exchange plate provided with a second flow passage. The first flow passage is used for cold gas to flow through, and the second flow passage is used for hot gas to flow through. The first heat exchange plate and the second heat exchange plate are alternately arranged among the plurality of sequentially connected heat exchange plates, so that the first flow passage and the second flow passage are alternately arranged in the regenerative type.

[0009] As a further solution of the present invention, the plurality of heat exchange plates are arranged along the first direction, and air inlet holes and return holes penetrating the heat exchange plates along the first direction are opened on the surfaces of the heat exchange plates. The air inlet holes opened on different heat exchange plates are aligned along the first direction to form an air inlet flow passage for cold gas to enter the regenerative core, and the return holes opened on different heat exchange plates are aligned along the first direction to form a return flow passage for cold gas to leave the regenerative core. The first flow passage is used to connect the air inlet flow passage and the return flow passage, so that the cold gas entering the regenerative core from the air inlet flow passage can enter the return flow passage through the first flow passage and be discharged from the regenerative core. Hot gas holes penetrating the heat exchange plates along the first direction are opened on the surfaces of the heat exchange plates. The hot gas holes opened on different heat exchange plates are aligned along the first direction to form a hot gas flow passage for hot gas to enter the regenerative core. The second flow passage connects the hot gas flow passage and the outside of the regenerative core, so that the hot gas entering the regenerative core from the hot gas flow passage can be discharged from the regenerative core through the second flow passage. An end plate for closing the air inlet flow passage, the return flow passage and the hot gas flow passage is provided at one end of the regenerative core away from the combustion chamber.

[0010] As a further solution of the present invention, the hot air holes are opened at the center of the heat exchange plate. A plurality of air inlet holes and return holes are opened on the heat exchange plate. The plurality of air inlet holes and the plurality of return holes are arranged at equal intervals around the hot air holes. The second flow channel includes a plurality of ribs provided on the second heat exchange plate flow surface. The plurality of ribs are arranged at equal intervals around the hot air holes. The hot air in the hot air flow channel can leave the hot air flow channel through the gaps between the ribs, enter the regenerative core, and finally leave the regenerative core.

[0011] As a further solution of the present invention, a wind guiding column with a cross-sectional shape matching that of the hot air hole is arranged in the hot air flow channel along the first direction. The outer surface of the wind guiding column gradually shrinks from one end close to the end plate to the end away from the end plate in the first direction, so as to form a wind guiding surface on the surface of the wind guiding column for guiding the hot air in the hot air flow channel to flow uniformly into the second flow channel.

[0012] As a further solution of the present invention, the first flow channel includes an introduction area communicating with the air inlet hole, an extraction area communicating with the return hole, and a main heat exchange area communicating with the introduction area and the extraction area. The flow surface of the first heat exchange plate forms the introduction area, the extraction area, and the main heat exchange area by being enclosed by a convex platform or recessed towards the contact surface. The distance from the position where the introduction area communicates with the air inlet hole to the hot air hole is the first distance, and the distance from the position where the extraction area is connected to the return hole to the hot air hole is the second distance. The first distance is greater than the second distance.

[0013] As a further solution of the present invention, a plurality of wavy convex platforms are provided in the main heat exchange area.

[0014] As a further solution of the present invention, the regenerator further includes a distributor provided between the combustion chamber and the regenerative core. The hot air inlet, the cold air inlet, and the cold air outlet are all opened on the distributor. The shape of the hot air inlet matches that of the hot air hole and is used to connect the gas outlet of the combustion chamber and the hot air flow channel. One end of the cold air inlet matches the shape of the air flow channel, and the other end matches the shape of the air inlet hole and is used to connect the air flow channel and the air inlet flow channel. The shape of the cold air outlet matches that of the return hole and is used to connect the combustion chamber and the return flow channel.

[0015] As a further solution of the present invention, the regenerator further includes a housing. The housing is fixed at one end of the distributor away from the combustion chamber in the first direction. The regenerative core is fixedly arranged in the housing, and an exhaust hole for discharging hot air is opened on the housing.

[0016] As a further solution of the present invention, a shock absorber for supporting the regenerative core and a connecting member for connecting the shock absorber and the regenerative core are arranged in the housing.

[0017] The present invention has the following beneficial effects:

[0018] The regenerator of the disclosed regenerative gas turbine is directly installed downstream of the combustion chamber, and the hot gas inlet on the regenerator for the entry of hot gas is directly connected to the gas outlet of the combustion chamber. During operation, the high-temperature gas discharged from the gas outlet of the combustion chamber directly enters the regenerator to exchange heat with the cold gas, and then is discharged from the regenerator. There is no need to use an additional connecting pipeline to connect the combustion chamber and the regenerator, and the regenerator is coaxially arranged with the compressor and the combustion chamber, which can reduce the axial length and radial size of the entire regenerative gas turbine, reduce the weight of the entire machine, and can obtain a higher fuel consumption rate under the premise of a smaller external dimension. It is particularly suitable for application scenarios with space limitations such as vehicle power and high requirements for fuel consumption rate. At the same time, the cold gas enters and exits from the same side of the regenerator, and there is no need for an additional channel structure to lead the cold gas passing through the regenerator back to the combustion chamber. Therefore, the structure is simple and compact, which can further shorten the external dimension of the entire machine and reduce the weight of the entire machine.

[0019] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The following will refer to the drawings for a further detailed description of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 is a schematic diagram of the overall structure of a regenerative gas turbine;

[0022] Figure 2 is a schematic diagram of the partial structure of a regenerative gas turbine;

[0023] Figure 3 is a schematic diagram of the structure of a regenerator;

[0024] Figure 4 is a schematic diagram of the structure of a distributor;

[0025] Figure 5 is a schematic diagram of the structure of a regenerative type;

[0026] Figure 6 is a schematic diagram of the structure of the second flow channel on the second heat exchange plate;

[0027] Figure 7 is a schematic diagram of the structure of the first flow channel on the first heat exchange plate;

[0028] Figure 8 is a schematic diagram of the structure of a shock absorber;

[0029] Figure 9 is a schematic diagram of the structure of a centrifugal impeller and a turbine component;

[0030] Figure 10 Schematic diagram of an integrated diffuser structure

[0031] Legend:

[0032] 1. Compressor; 11. Centrifugal impeller; 12. Large blade; 13. Small blade; 14. Integrated diffuser; 141. Diffuser front wall; 142. Diffuser rear wall; 143. Bleed air passage; 2. Combustion chamber; 21. Combustion gas outlet; 22. Air flow passage; 23. Combustion liner; 24. Combustion chamber outer casing; 25. Combustion chamber inner casing; 3. Regenerator; 31. Hot gas inlet; 32. Cold air inlet; 33. Cold air outlet; 34. Regeneration core; 35. Heat exchange plate; 351. First heat exchange plate; 352. Second heat exchange plate; 353. Air inlet hole; 354. Return hole; 355. Hot gas hole; 356. Rib; 357. Introduction area; 358. Outlet area; 359. Main heat exchange area; 36. End plate; 37. Air guide column; 38. Distributor; 381. Support plate; 39. Housing; 391. Exhaust gas hole; 392. Reinforcement plate; 393. Spring mounting seat; 394. Push rod; 395. Spring; 4. Turbine component; 41. First-stage rotor; 42. Second-stage rotor. Specific embodiments

[0033] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways defined and covered by the following.

[0034] Please refer to Figures 1 - 10 , the present invention provides a technical solution: a regenerative gas turbine, including a compressor 1, a combustion chamber 2 and a regenerator 3. The compressor 1, the combustion chamber 2 and the regenerator 3 are sequentially connected along a first direction. The regenerator 3 has a hot gas inlet 31 for hot gas to enter the regenerator 3. The hot gas inlet 31 is opened on the end face of the regenerator 3 facing the combustion chamber 2, and the hot gas inlet 31 is connected to the combustion gas outlet 21 of the combustion chamber 2;

[0035] As Figure 1 shown, the regenerator 3 of the regenerative gas turbine disclosed by the present invention is directly installed downstream of the combustion chamber 2, and the hot gas inlet 31 for hot gas to enter on the regenerator 3 is directly connected to the combustion gas outlet 21 of the combustion chamber 2. During operation, the high-temperature combustion gas discharged from the combustion gas outlet 21 of the combustion chamber 2 directly enters the regenerator 3 to exchange heat with cold air, and then is discharged from the regenerator 3. There is no need to use an additional connecting pipeline to connect the combustion chamber 2 and the regenerator 3, and the regenerator 3 is coaxially arranged with the compressor 1 and the combustion chamber 2, which can reduce the axial length and radial size of the whole regenerative gas turbine, reduce the weight of the whole machine, and can obtain a higher fuel consumption rate under the premise of a smaller outer contour size. It is especially suitable for use scenarios with space limitations and high fuel consumption rate requirements such as vehicle power;

[0036] Further, the regenerator 3 further includes a cold air inlet 32 for allowing cold air to enter the regenerator 3 and a cold air outlet 33 for allowing cold air to exit the regenerator 3. Both the cold air inlet 32 and the cold air outlet 33 are provided on the end face of the regenerator 3 facing the combustion chamber 2. An air flow channel 22 is formed in the combustion chamber 2. The two ends of the air flow channel 22 are respectively connected to the exhaust port of the compressor 1 and the cold air inlet 32, so that the cold air discharged from the compressor 1 can enter the regenerator 3 from the air flow channel 22. The cold air outlet 33 is connected to the combustion chamber 2, so that the cold air discharged from the regenerator 3 can enter the flame tube 23 in the combustion chamber 2 to participate in combustion;

[0037] As Figures 3 - 4 shown, the cold air inlet 32 for allowing cold air to enter the regenerator 3 and the cold air outlet 33 for allowing cold air to exit the regenerator 3 are also provided on the end face of the regenerator 3 facing the combustion chamber 2. The cold air compressed by the compressor 1 directly enters the regenerator 3 from the cold air inlet 32 after passing through the air flow channel 22 formed in the combustion chamber 2. The cold air exchanges heat with the high-temperature gas in the regenerator 3 and is discharged from the cold air outlet 33 on the same side as the cold air inlet 32, and then enters the combustion chamber 2 to participate in combustion. Thus, the high-temperature gas discharged from the combustion chamber 2 preheats the cold air, making full use of the waste heat of the high-temperature gas. Since both the cold air inlet 32 and the cold air outlet 33 are provided on the end face of the regenerator 3 facing the combustion chamber 2, the cold air enters and exits from the same side of the regenerator 3, and there is no need for an additional channel structure to lead the cold air passing through the regenerator 3 back to the combustion chamber 2. Therefore, the structure is simple and compact, which can further shorten the overall outline size of the machine and reduce the overall weight;

[0038] Specifically, the first direction is the axial direction of the compressor.

[0039] Further, as Figure 9 shown, the compressor 1 adopts a single-stage centrifugal compressor gas rotor structure, including a centrifugal impeller 11. Due to its simple and reliable structure, it can reduce the number of disk bodies on the premise of providing sufficient pressure ratio, reduce the structural complexity, is beneficial to reducing production costs, and improving the system robustness. Compared with the multi-stage axial flow compressor 1 used in traditional gas turbines, the axial dimension of the gas rotor is compressed to the greatest extent, which is beneficial to realizing the lightweight of the gas turbine;

[0040] Specifically, the centrifugal impeller 11 adopts a super high pressure ratio design. As Figure 9 shown, its blades adopt a design of one large blade 12 and two small blades 13. Compared with the design of traditional centrifugal impellers with only large blades or one large blade and one small blade, its single stage can achieve a pressure ratio of 10 orders of magnitude.

[0041] Further, as Figure 10As shown, in the compressor 1, the inlet casing, the impeller shroud, and the axial diffuser are integrally designed as an integrated diffuser 14. The integrated diffuser 14 includes a diffuser front wall 141 and a diffuser rear wall 142, and the two are connected and fixed by long bolts.

[0042] The diffuser front wall 141 simultaneously undertakes the functions of the inlet casing, the impeller shroud, and the axial diffuser front wall. It is formed by casting, which reduces the number of parts to the greatest extent and can greatly reduce the production cost of the whole machine.

[0043] The diffuser rear wall 142 undertakes the functions of the axial diffuser rear wall of the compressor 1 and the turbine cooling air extraction. It sends the air at the outlet of the integrated diffuser 14 to the turbine component 4 through the diffuser air extraction channel 143 to cool the turbine rotor disc. Compared with the traditional combustion chamber 2 chamber air extraction cooling, since the air flow in the combustion chamber 2 chamber has been heated and raised in temperature by the regenerator 3, the temperature of the air flow at the outlet of the integrated diffuser 14 is much lower than the temperature of the air flow in the combustion chamber 2 chamber. Therefore, the cooling effect of extracting air from the outlet of the integrated diffuser 14 will be significantly better than the traditional scheme.

[0044] Specifically, as Figure 2 shown, an air flow channel 22 is formed between the outer casing 24 of the combustion chamber and the inner casing 25 of the combustion chamber. The air outlet of the compressor 1 is communicated with the air flow channel 22. The cold air compressed by the compressor 1 enters the air flow channel 22 formed between the outer casing 24 of the combustion chamber and the inner casing 25 of the combustion chamber from the air outlet of the compressor 1, and then enters the regenerator 3 under the guidance of the air flow channel 22.

[0045] Specifically, as Figure 5 shown, the regenerator 3 includes a regenerator core 34. The regenerator core 34 includes a plurality of heat exchange plates 35 connected in sequence ( Figure 1 only one heat exchange plate 35 is shown in the figure to ensure the clarity of the structure inside the housing 39). The heat exchange plate 35 includes a first heat exchange plate 351 provided with a first flow channel and a second heat exchange plate 352 provided with a second flow channel. The first flow channel is used for the cold air to flow through, and the second flow channel is used for the hot air to flow through. The first heat exchange plate 351 and the second heat exchange plate 352 are alternately arranged among the plurality of heat exchange plates 35 connected in sequence, so that the first flow channel and the second flow channel in the regenerator type 34 are alternately arranged.

[0046] A plurality of first heat exchange plates 351 and a plurality of second heat exchange plates 352 are connected in sequence to form a plurality of first flow channels and second flow channels in the regenerative core 34. The number of first flow channels is the same as the number of first heat exchange plates 351, and the number of second flow channels is the same as the number of second heat exchange plates 352. At the same time, the first heat exchange plates 351 and the second heat exchange plates 352 are arranged alternately, so that the plurality of first flow channels and second flow channels in the regenerative core 34 are arranged alternately. During operation, the cold air is divided into multiple strands and enters the first flow channels formed by different first heat exchange plates 351 respectively, and the hot air is divided into multiple strands and enters the second flow channels formed by different second heat exchange plates 352 respectively. The cold air in the first flow channel exchanges heat with the hot air in two adjacent second flow channels through the first heat exchange plate 351 and the second heat exchange plate 352, thereby dividing the cold air and the hot air entering the regenerator 3 into multiple strands, which can avoid local overheating or overcooling, reduce the temperature gradient, make the heat exchange more uniform, avoid heat transfer dead angles, and at the same time improve the heat transfer efficiency per unit volume, reduce the heat transfer area under the same heat transfer capacity, thereby reducing the volume of the regenerative core 34, and further reducing the volume of the regenerator 3 and the overall regenerative gas turbine. At the same time, the arrangement of multiple first flow channels and multiple second flow channels can prevent the system from completely shutting down when some of the first flow channels or / and second flow channels fail, improving the fault tolerance of the regenerator 3.

[0047] Specifically, the heat exchange plate 35 includes a flow channel surface provided with a first flow channel or a second flow channel and a contact surface opposite to the flow channel surface. When a plurality of heat exchange plates 35 are connected in sequence, the flow channel surfaces and the contact surfaces between the heat exchange plates 35 are opposite to each other;

[0048] Specifically, as Figure 5 shown, a plurality of heat exchange plates 35 are arranged along a first direction, and air inlet holes 353 and return holes 354 penetrating the heat exchange plate 35 along the first direction are formed on the surface of the heat exchange plate 35. The air inlet holes 353 formed on different heat exchange plates 35 are aligned along the first direction to form an air inlet flow channel for the cold air to enter the regenerative core 34, and the return holes 354 formed on different heat exchange plates 35 are aligned along the first direction to form a return flow channel for the cold air to leave the regenerative core 34. The first flow channel is used to connect the air inlet flow channel and the return flow channel, so that the cold air entering the regenerative core 34 from the air inlet flow channel can enter the return flow channel through the first flow channel and be discharged from the regenerative core 34; hot air holes 355 penetrating the heat exchange plate 35 along the first direction are formed on the surface of the heat exchange plate 35. The hot air holes 355 formed on a plurality of heat exchange plates 35 are aligned along the first direction to form a hot air flow channel for the hot air to enter the regenerative core 34. The second flow channel communicates with the hot air flow channel and the outside of the regenerative core 34, so that the hot air entering the regenerative core 34 from the hot air flow channel can be discharged from the regenerative core 34 through the second flow channel;

[0049] Cool air enters the intake air flow path through the cool air inlet 32 and flows along the intake air flow path into the regenerator core 34. During the flow of the cool air in the intake air flow path, the cool air will be divided into multiple strands and enter the first flow paths at different positions respectively. Then, it enters the return flow path through the first flow paths and flows along the return flow path towards the combustion chamber 2. Finally, it leaves the regenerator core 34 from the cool air outlet 33. The hot air enters the hot air flow path through the hot air inlet 31 and flows along the hot air flow path into the regenerator core 34. During the flow of the hot air in the hot air flow path, it will also be divided into multiple strands and enter the second flow paths at different positions respectively. Then, it is discharged from the regenerator core 34 through the second flow paths. The cool air in the first flow path exchanges heat with the hot air in the two adjacent second flow paths, so that the hot air and the cool air are both divided into multiple strands for heat exchange;

[0050] Specifically, at one end of the regenerator core 34 away from the combustion chamber 2, there is an end plate 36 that closes the intake air flow path, the return flow path, and the hot air flow path, thus closing one end of the regenerator core 34 in the first direction. This ensures that the cool air entering the intake air flow path can only enter the second flow path through the first flow path, and the cool air in the second flow path can only flow towards the combustion chamber 2. At the same time, it ensures that the hot air entering the hot air flow path can only leave the hot air flow path through the second flow path, thereby preventing the hot air and the cool air from leaking or deviating from the set flow route and ensuring the safe use of the regenerative gas turbine;

[0051] Specifically, the heat exchange plates 35 are fixed by welding.

[0052] Specifically, the hot air holes 355 are opened at the center of the heat exchange plate 35. A plurality of intake holes 353 and return holes 354 are opened on the heat exchange plate 35. The plurality of intake holes 353 and the plurality of return holes 354 are arranged at equal intervals around the hot air holes 355. The second flow path includes a plurality of ribs 356 arranged on the flow surface of the second heat exchange plate 352. The plurality of ribs 356 are arranged at equal intervals around the hot air holes 355. The hot air in the hot air flow path can leave the hot air flow path from the gaps between the ribs 356, enter the regenerator core 34, and finally leave the regenerator core 34;

[0053] Such as Figure 5As shown, a plurality of air inlet holes 353 and return holes 354 are formed in the heat exchange plate 35. The numbers of the air inlet holes 353 and the return holes 354 can be designed according to the size of the heat exchange plate 35. When the numbers of the air inlet holes 353 and the return holes 354 are inconsistent, the numbers of the air inlet channels and the return channels formed in the regenerative core 34 are also different. One air inlet channel and a plurality of return channels are connected through the first channel, or a plurality of air inlet channels are connected to one return channel through the first channel. In this example, the numbers of the air inlet holes 353 and the return holes 354 are the same. Thus, the same number of air inlet channels and return channels are formed on the regenerative core 34. The air inlet channels, the return channels and the first channel correspond to each other one by one. The cold air can be divided into multiple strands through a plurality of air inlet channels and enter the air inlet channels at different positions respectively. Then, it is further divided into multiple strands in the air inlet channels and enters different first channels, so as to further divide the cold air entering the regenerative core 34. Similarly, the hot air entering the hot air channel will be divided into multiple strands and enter different second channels at different positions. As Figure 6 shown, the second channel includes a plurality of ribs 356. The plurality of ribs 356 subdivide the second channel surface into a plurality of regions for the hot air to flow through, so that the hot air entering the second channel is further divided into multiple strands, and further divides the hot air entering the second channel, further reducing the temperature gradient, making the heat exchange more uniform and avoiding heat transfer dead angles;

[0054] Meanwhile, the air inlet holes 353, the return holes 354 and the ribs 356 on the second heat exchange plate 352 are arranged at equal intervals around the hot air hole 355. Thus, the air inlet channels and the return channels formed on the regenerative core 34 are arranged around the hot air channel, and the ribs 356 for guiding the hot air in the second channel are also arranged around the hot air channel. Thus, the hot air in the hot air channel can be guided uniformly along the circumferential direction of the hot air channel away from the hot air channel through the ribs 356 around the hot air channel, so as to realize uniform heat exchange between the hot air and the cold air at different positions, make the heat exchange more uniform and avoid local overheating or overcooling;

[0055] Furthermore, a wind guiding column 37 with a cross-sectional shape matching the hot air hole 355 is arranged in the hot air channel along the first direction. The wind guiding column 37 gradually shrinks from the end close to the end plate 36 to the end away from the end plate 36 in the first direction, so as to form a wind guiding surface on the surface of the wind guiding column 37 for guiding the hot air in the hot air channel to flow uniformly into the second channel;

[0056] In order to enable the hot air in the hot air runner to enter different positions of the second runner evenly, a wind guiding column 37 is installed in the hot air runner. The cross-sectional shape of the wind guiding column 37 is the same as that of the hot air hole 355, and the wind guiding column 37 is located at the center of the hot air hole 355. In this example, the hot air hole 355 is circular, so the cross-section of the wind guiding column 37 is also circular, and the wind guiding column 37 is coaxially arranged with the hot air hole 355. Moreover, the diameter of the wind guiding column 37 at the end close to the end plate 36 is larger than the diameter of the wind guiding column 37 at the end far from the end plate 36, and the diameter change is gradual. In this way, an inclined wind guiding surface can be formed on the surface of the wind guiding column 37. When the hot air enters the hot air runner, as the hot air penetrates deeper into the hot air runner, part of the hot air will leave the hot air runner through the second runner, which will cause the volume of the hot air to be smaller at the position farther from the combustion chamber 2 in the hot air runner. However, the diameter of the wind guiding column 37 is larger at the position farther from the combustion chamber 2, so that the space between the hot air runner and the wind guiding column 37 is smaller, thereby ensuring that the hot air always maintains a certain range of pressure when moving in the hot air runner, making the flow velocity difference of the hot air in different positions of the second runner in the first direction not exceed the set range. At the same time, the wind guiding surface can also evenly disperse the hot air in the hot air runner from the center to the periphery, distribute the hot air entering the second runner evenly between different ribs 356 in the second runner, and then realize uniform heat exchange, prevent the situation of too large a difference in hot air flow rate at different positions, prevent local overheating, enable the hot air to exchange heat evenly with the cold air, and improve the heat exchange efficiency;

[0057] As Figure 1 shown, in this example, the diameter of the end of the wind guiding column 37 close to the end plate 36 matches the diameter of the hot air hole 355 to close one end of the hot air runner close to the end plate 36 through the wind guiding column 37. As Figure 3 shown, at this time, the end plate 36 is annular and is used to close the intake runner and the return runner.

[0058] Furthermore, a turbine component 4 is arranged downstream of the centrifugal impeller 11. The turbine component 4 includes a turbine rotor. Specifically, in this example, the turbine rotor includes a primary rotor 41 and a secondary rotor 42. The primary rotor 41 and the secondary rotor 42 are both coaxially arranged with the centrifugal impeller 11. The wind guiding column 37 is in a hollow state. As Figure 1 shown, in this example, the turbine rotor outputs power at the front end, and there is still a large space reserved in the central area at the rear end of the hollow wind guiding column 37. Therefore, the turbine rotor can also be designed to output power at the rear end, which is convenient for the regenerative gas turbine to be flexibly modified to adapt to different application scenarios.

[0059] Specifically, the first flow channel includes an introduction area 357 communicating with the air inlet hole 353, a lead-out area 358 communicating with the return hole 354, and a main heat exchange area 359 communicating with the introduction area 357 and the lead-out area 358. The flow channel surface of the first heat exchange plate 351 forms the introduction area 357, the lead-out area 358, and the main heat exchange area 359 by being enclosed by bosses or recessed towards the contact surface;

[0060] Since the flow channel surface of the first heat exchange plate 351 is in contact connection with the contact surface of the second heat exchange plate 352, it is necessary to form the introduction area 357, the lead-out area 358, and the main heat exchange area 359 on the flow channel surface of the first heat exchange plate 351 by being enclosed by bosses or recessed towards the contact surface, so as to generate a gap for cold air to flow between the introduction area 357, the lead-out area 358, and the main heat exchange area 359 and the contact surface of the adjacent second heat exchange plate 352. As Figure 7 shown, in this example, the flow channel surface of the first heat exchange plate 351 forms the introduction area 357, the lead-out area 358, and the main heat exchange area 359 by being recessed towards the contact surface. The introduction area 357 is connected to the air inlet hole 353, and the lead-out area 358 is connected to the return hole 354. Thus, cold air can enter the introduction area 357 from the air inlet flow channel, enter the lead-out area 358 after passing through the main heat exchange area 359 from the introduction area 357, and finally enter the return flow channel from the lead-out area 358, realizing that the cold air in the air inlet flow channel enters the return flow channel from the first flow channel and achieving efficient heat exchange with the hot air in the second flow channel in the first flow channel.

[0061] Furthermore, as Figure 7 shown, the distance from the position where the introduction area 357 communicates with the air inlet hole 353 to the hot air hole 355 is the first distance, and the distance from the position where the lead-out area 358 is connected to the return hole 354 to the hot air hole 355 is the second distance. The first distance is greater than the second distance;

[0062] Since the hot air hole 355 is opened at the middle position of the heat exchange plate 35, the hot air flow channel is located at the center of the regenerative core 34, and the hot air flow direction is from the center of the regenerative core 34 along the second flow channel towards the outside of the regenerative core 34. When the first distance is greater than the second distance, when the cold air in the air inlet flow channel enters the return flow channel through the first flow channel, it needs to move towards the hot air flow channel in the first flow channel, that is, towards the center of the regenerative core 34. This makes the flow direction of the cold air in the first flow channel opposite to the flow direction of the hot air in the second flow channel, so that the cold air in the first flow channel and the hot air in the second flow channel are in countercurrent flow. The countercurrent design can make the average temperature difference larger. Under the same heat transfer amount, the required heat transfer area is smaller, improving the heat transfer efficiency, and thus further reducing the volume of the regenerative core 34.

[0063] Furthermore, as Figure 7As shown in the figure, the main heat exchange area 359 is provided with a plurality of wavy bosses. The wavy bosses protrude on the flow channel surface of the first heat exchange plate 351 and are recessed on the contact surface of the first heat exchange plate 351. This can increase the heat exchange area of both the cold air and the hot air in the main heat exchange area 359, and at the same time increase the complexity of the path in the main heat exchange area 359, increasing the time required for the cold air to flow in the main heat exchange area 359, thereby further increasing the heat exchange efficiency.

[0064] Furthermore, as Figures 3 - 4 shown in the figure, the regenerator 3 further includes a distributor 38 provided between the combustion chamber 2 and the regenerator core 34. The hot air inlet 31, the cold air inlet 32, and the cold air outlet 33 are all opened on the distributor 38. The shape of the hot air inlet 31 matches the shape of the hot air hole 355 and is used to connect the gas outlet 21 of the combustion chamber 2 and the hot air flow channel. One end of the cold air inlet 32 matches the shape of the air flow channel 22, and the other end matches the shape of the air inlet hole 353 and is used to connect the air flow channel 22 and the air inlet flow channel. The shape of the cold air outlet 33 matches the shape of the return hole 354 and is used to connect the combustion chamber 2 and the return flow channel;

[0065] As Figures 3 - 4 shown in the figure, the hot air inlet 31, the cold air inlet 32, and the cold air outlet 33 opened on the distributor 38 are used to respectively guide the cold air into and out of the regenerator core 34 and the hot air into the regenerator core 34. At the same time, the shape of the hot air inlet 31 matches the shape of the hot air hole 355, so that the hot air can enter the hot air flow channel more smoothly. Similarly, the shapes of the cold air inlet 32 and the cold air outlet 33 respectively match the shapes of the air inlet hole 353 and the return hole 354, making the cold air enter the air inlet flow channel more smoothly when entering from the cold air inlet 32 and leave the return flow channel more smoothly when leaving from the cold air outlet 33;

[0066] As Figures 3 - 4 shown in the figure, the air inlet is a special-shaped channel. The two ends of the air inlet are respectively used to connect the air flow channel 22 and the air inlet flow channel. Therefore, one end of the air inlet connected to the air flow channel 22 matches the shape of the air flow channel 22, and the end of the air inlet connected to the air inlet flow channel matches the shape of the air inlet hole 353;

[0067] The distributor 38 also acts as a load-bearing casing to support the turbine component 4;

[0068] At the same time, to ensure the strength of the distributor 38, a plurality of support plates 381 are provided on the distributor 38. Some of the support plates 381 are strengthening support plates, and the remaining support plates 381 are oil and gas support plates. In addition to the support function, a pipeline channel for the lubricating oil required by the bearings at the turbine component 4 is also provided.

[0069] Specifically, the regenerator 3 further includes a housing 39. The housing 39 is fixed to one end of the distributor 38 away from the combustion chamber 2 in the first direction. The regenerative core 34 is fixed inside the housing 39, and the housing 39 is provided with exhaust holes 391 for discharging hot air.

[0070] Setting the regenerative core 34 inside the housing 39 can achieve the effects of heat preservation and protection of the regenerative core 34. At the same time, by opening the exhaust holes 391, the direction of the hot air is guided to prevent the hot air discharged from the regenerative core 34 from escaping.

[0071] Specifically, both ends of the regenerative core 34 in the first direction are fixedly connected to the distributor 38 and the housing 39 respectively to ensure the stability of the regenerative core 34.

[0072] Furthermore, shock absorbers for supporting the regenerative core 34 and connecting members for connecting the shock absorbers and the regenerative core 34 are arranged inside the housing 39 to increase the stability of the regenerative core 34 during use.

[0073] Specifically, as Figure 1 shown, a plurality of shock absorbers are arranged inside the housing 39. As Figure 8 shown, the shock absorber includes a spring mounting seat 393, a push rod 394, a spring 395, a snap ring, etc. One end of the spring mounting seat 393 is fixed on the housing 39, and the other end elastically slides and mounts a push rod 394 through a spring 395. The end of the push rod 394 away from the spring mounting seat 393 is connected to the regenerative core 34 through a connecting member. The spring 395 between the push rod 394 and the spring mounting seat 393 can improve the stability of the regenerative core 34 under various working conditions, allow the regenerative core 34 to generate a certain displacement or deformation in the radial direction, and can release the working stress of the heat exchange plate 35 on the premise of ensuring the working safety of the gas turbine, preventing the heat exchange plate 35 from undergoing irreversible deformation, damage, and even gas leakage and air leakage due to excessive stress.

[0074] Specifically, as Figure 3 shown, the connecting member includes a plurality of reinforcing plates 392 arranged at intervals in the first direction inside the housing 39. The reinforcing plates 392 are fixed between adjacent two heat exchange plates 35. At the same time, holes matching the shapes of the air inlet holes 353, the return holes 354, and the hot air holes 355 are opened at corresponding positions of the reinforcing plates 392. The reinforcing plates do not affect the normal ventilation of the air inlet flow channel, the return flow channel, and the hot air flow channel. To ensure the heat exchange efficiency and reduce the weight at the same time, the thickness of the heat exchange plate 35 is about 0.2 mm. Fixing the reinforcing plates 392 between the heat exchange plates 35 can not only connect the shock absorbers, but also effectively increase the strength of the regenerative core 34, avoid bending and torsion of the regenerative core 34 during operation, and at the same time;

[0075] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A regenerative gas turbine, comprising a compressor (1), a combustion chamber (2) and a regenerator (3), characterized in that: The compressor (1), the combustion chamber (2), and the regenerator (3) are connected in sequence along a first direction. The regenerator (3) has a hot gas inlet (31) for hot gas to enter the regenerator (3). The hot gas inlet (31) is opened on the end face of the regenerator (3) facing the combustion chamber (2), and the hot gas inlet (31) is connected to the gas outlet (21) of the combustion chamber (2). The regenerator (3) further includes a cold gas inlet (32) for cold gas to enter the regenerator (3) and a cold gas outlet (33) for cold gas to be discharged from the regenerator (3). Both the cold gas inlet (32) and the cold gas outlet (33) are opened on the end face of the regenerator (3) facing the combustion chamber (2). An air flow passage (22) is formed in the combustion chamber (2). Two ends of the air flow passage (22) are respectively connected to the exhaust port of the compressor (1) and the cold gas inlet (32). The air flow passage (22) is configured to introduce the cold gas discharged from the compressor (1) into the inner cavity of the regenerator (3) through the cold gas inlet (32) for heating. The cold gas outlet (33) is connected to the combustion chamber (2), and the cold gas outlet (33) is configured to introduce the heated cold gas into the flame tube (23) of the combustion chamber (2) to participate in combustion.

2. A regenerative gas turbine according to claim 1, characterized in that: The regenerator (3) includes a regenerator core (34). The regenerator core (34) includes a plurality of heat exchange plates (35) connected in sequence. The heat exchange plate (35) includes a first heat exchange plate (351) provided with a first flow passage and a second heat exchange plate (352) provided with a second flow passage. The first flow passage is for cold gas to flow through, and the second flow passage is for hot gas to flow through. The first heat exchange plate (351) and the second heat exchange plate (352) are alternately arranged among the plurality of sequentially connected heat exchange plates (35) so that the first flow passage and the second flow passage are alternately arranged in the regenerator core (34).

3. A regenerative gas turbine according to claim 2, wherein: The plurality of heat exchange plates (35) are arranged along the first direction, and air inlet holes (353) and return holes (354) penetrating the heat exchange plates (35) along the first direction are formed on the surfaces of the heat exchange plates (35). The air inlet holes (353) formed in different heat exchange plates (35) are aligned along the first direction to form an air inlet flow passage for cold gas to enter the regenerator core (34). The return holes (354) formed in different heat exchange plates (35) are aligned along the first direction to form a return flow passage for cold gas to leave the regenerator core (34). The first flow passage is configured to communicate the air inlet flow passage and the return flow passage so that the cold gas entering the regenerator core (34) from the air inlet flow passage can enter the return flow passage through the first flow passage and be discharged from the regenerator core (34). Hot gas holes (355) penetrating the heat exchange plates (35) along the first direction are formed on the surfaces of the heat exchange plates (35). The hot gas holes (355) formed in different heat exchange plates (35) are aligned along the first direction to form a hot gas flow passage for hot gas to enter the regenerator core (34). The second flow passage communicates the hot gas flow passage and the outside of the regenerator core (34) so that the hot gas entering the regenerator core (34) from the hot gas flow passage can be discharged from the regenerator core (34) through the second flow passage. The regenerative core (34) is provided with an end plate (36) at one end far from the combustion chamber (2) to enclose the intake air flow path, the reflux flow path, and the hot air flow path.

4. The regenerative gas turbine according to claim 3, characterized in that: The hot air holes (355) are opened at the center of the heat exchange plate (35). A plurality of intake air holes (353) and reflux holes (354) are opened on the heat exchange plate (35). The plurality of intake air holes (353) and the plurality of reflux holes (354) are arranged at equal intervals around the hot air holes (355); The second flow path includes a plurality of ribs (356) provided on the flow path surface of the second heat exchange plate (352). The plurality of ribs (356) are arranged at equal intervals around the hot air holes (355). The hot air in the hot air flow path can leave the hot air flow path from the gaps between the ribs (356) and enter the regenerative core (34) and finally leave the regenerative core (34).

5. The regenerative gas turbine according to claim 4, characterized in that: A wind guiding column (37) with a cross-sectional shape matching that of the hot air holes (355) is arranged in the hot air flow path along the first direction. The outer surface of the wind guiding column (37) gradually narrows from one end close to the end plate (36) to the end far from the end plate (36) in the first direction, so as to form a wind guiding surface on the surface of the wind guiding column (37) for guiding the hot air in the hot air flow path to uniformly flow to the second flow path.

6. The regenerative gas turbine according to claim 3, characterized in that: The first flow path includes an introduction area (357) communicating with the intake air holes (353), an extraction area (358) communicating with the reflux holes (354), and a main heat exchange area (359) communicating with the introduction area (357) and the extraction area (358). The flow path surface of the first heat exchange plate (351) is enclosed by bosses or recessed towards the contact surface to form the introduction area (357), the extraction area (358), and the main heat exchange area (359); The distance from the position where the introduction area (357) communicates with the intake air holes (353) to the hot air holes (355) is the first distance, and the distance from the position where the extraction area (358) is connected to the reflux holes (354) to the hot air holes (355) is the second distance. The first distance is greater than the second distance.

7. A regenerative gas turbine according to claim 6, characterized in that: The main heat exchange area (359) is provided with a plurality of wavy bosses.

8. A regenerative gas turbine according to claim 2, characterized in that: The regenerator (3) further includes a distributor (38) provided between the combustion chamber (2) and the regenerative core (34). The hot air inlet (31), the cold air inlet (32), and the cold air outlet (33) are all opened on the distributor (38). The shape of the hot air inlet (31) matches that of the hot air holes (355) and is used to connect the gas outlet (21) of the combustion chamber (2) with the hot air flow path. One end of the cold air inlet (32) matches the shape of the air flow channel (22), and the other end matches the shape of the intake air holes (353) and is used to connect the air flow channel (22) with the intake air flow path. The shape of the cold air outlet (33) matches that of the reflux holes (354) and is used to connect the combustion chamber (2) with the reflux flow path.

9. A regenerative gas turbine according to claim 8, characterized in that: The regenerator (3) further includes a housing (39). The housing (39) is fixed at one end of the distributor (38) far from the combustion chamber (2) in the first direction. The regenerative core (34) is fixedly arranged in the housing (39), and an exhaust hole (391) for discharging hot air is opened on the housing (39).

10. A regenerative gas turbine according to claim 9, characterized in that: An anti-vibration device for supporting the regenerative core (34) and a connecting member for connecting the anti-vibration device and the regenerative core (34) are provided inside the housing (39).

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