CN213574233U - Turbine and power generation system - Google Patents
Turbine and power generation system Download PDFInfo
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- CN213574233U CN213574233U CN202022663171.6U CN202022663171U CN213574233U CN 213574233 U CN213574233 U CN 213574233U CN 202022663171 U CN202022663171 U CN 202022663171U CN 213574233 U CN213574233 U CN 213574233U
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Abstract
The utility model provides a turbine and power generation system relates to the power machinery field, has solved the poor problem of cooling effect of turbine among the power generation system. The turbine comprises a turbine stator and a turbine rotor, wherein a first cavity is arranged in the turbine stator, the turbine rotor is positioned in the first cavity, the turbine rotor comprises a main shaft and an impeller arranged on the main shaft, and the main shaft and the impeller rotate along the axial direction of the main shaft in the first cavity; a stator cooling flow passage is arranged on the turbine stator, a rotor cooling flow passage is arranged on the turbine rotor, an outlet of the stator cooling flow passage is matched with an inlet of the rotor cooling flow passage, and a cooling working medium flows through the stator cooling flow passage and enters the rotor cooling flow passage. The utility model provides a power generation system contains above-mentioned turbine. The utility model discloses improve turbine's cooling effect, improved turbine cooling efficiency, improved power generation system's generating efficiency.
Description
Technical Field
The utility model relates to a power machinery technical field especially relates to a turbine and power generation system.
Background
Supercritical Carbon Dioxide (SCO for short)2) The Brayton cycle power generation system has the characteristics of high power generation efficiency, good environmental protection, high economic performance and wide application range, and has good application prospect.
The turbine is one of the most important components in the brayton cycle power generation system, and in order to ensure the normal operation of the system, the turbine needs to be effectively cooled, at the present stage, the cooling of the turbine mostly adopts a natural cooling method, and part of the turbine rotor leaks to the outer side of a turbine casing. During the operation of the turbine rotor, the temperature of the outer side of the turbine casing is lower, and the heat in the turbine casing can be transferred to the outside of the turbine through the turbine rotor which leaks outwards.
However, SCO2The Brayton cycle power generation system has the advantages that the requirement on compactness is provided for a turbine structure due to high rotating speed, the arrangement of a rotor exposed section or a coupling is unrealistic, the traditional natural cooling method is difficult to use, and the cooling effect of the turbine is poor.
SUMMERY OF THE UTILITY MODEL
In order to solve at least one problem mentioned in the background art, the utility model provides a turbine and power generation system has improved the cooling effect of turbine, has improved the cooling efficiency of turbine, has improved the work efficiency of turbine, and then has improved power generation system's generating efficiency.
In order to achieve the above object, in a first aspect, the present invention provides a turbine, including turbine stator and turbine rotor, be provided with first cavity in the turbine stator, turbine rotor is located first cavity, and turbine rotor includes the main shaft and sets up the impeller on the main shaft, and main shaft and impeller rotate along the axial of main shaft in first cavity. A stator cooling flow passage is arranged on the turbine stator, a rotor cooling flow passage is arranged on the turbine rotor, an outlet of the stator cooling flow passage is matched with an inlet of the rotor cooling flow passage, and a cooling working medium flows through the stator cooling flow passage and enters the rotor cooling flow passage.
The utility model provides a turbine rotates along the main shaft axial in first cavity through setting up main shaft and impeller, can reach the purpose of the external acting of turbine. Through setting up stator cooling flow channel and rotor cooling flow channel, ensure that cooling medium can be at the inside flow of turbine, cooling medium's flow path is: enters through the inlet of the stator cooling channel, then enters the rotor cooling channel, and finally leaves the turbine through the outlet of the rotor cooling channel. The turbine can generate certain heat in the working process, and the heat is transferred to the cooling working medium through the turbine based on the heat transfer principle, so that the temperature reduction in the turbine is completed. The utility model discloses improve turbine cooling effect, improved turbine cooling efficiency.
In the turbine, optionally, a second cavity is arranged in the main shaft, a pull rod is arranged in the second cavity, at least part of the pull rod extends to the outside of the second cavity, and an impeller is sleeved on the pull rod positioned outside the second cavity.
Annular areas are arranged between the outer wall surface of the pull rod and the inner wall surface of the second cavity and between the outer wall surface of the pull rod and the inner wall surface of the impeller, cooling through holes are formed in the main shaft and communicated with the stator cooling flow channel and the annular areas, and the annular areas and the cooling through holes jointly form a rotor cooling flow channel.
And the cooling working medium flows through the cooling through holes from the stator cooling flow passage and enters the annular space area.
Through setting up the pull rod, can carry out zonulae occludens with main shaft and impeller, through setting up annular space and cooling through-hole, inject the circulation direction in the rotor cooling runner to realize the effective cooling of cooling working medium pair main shaft and impeller.
In the above turbine, optionally, the annular region extends along the axial direction of the main shaft, and at least a part of the annular region extends to the end of the impeller.
The annular area comprises a first annular area and a second annular area, the first annular area is located between the outer wall surface of the pull rod and the inner wall surface of the second cavity, and the second annular area is located between the outer wall surface of the pull rod and the inner wall surface of the impeller.
The arrangement can ensure that the cooling working medium circulates in the rotor cooling flow channel so as to ensure that the cooling working medium can realize the cooling of the impeller and the main shaft.
In the turbine, optionally, an extension portion is provided on an outer peripheral wall of the tie rod located outside the second cavity, and an end of the extension portion is in close contact with an inner wall surface of the impeller. The extension part is provided with at least one first through hole which is communicated with the first annular space area and the second annular space area.
And a fastener is arranged on one side of the pull rod close to the end part of the impeller and is connected with the impeller and the pull rod. At least one second through hole is formed in the fastener, and the second through hole is communicated with the second annular space area and the outside.
The utility model provides a turbine can guarantee the zonulae occludens of pull rod and impeller through setting up the extension to guarantee the zonulae occludens of main shaft and impeller. The purpose of communicating the first annular space area and the second annular space area can be achieved by arranging the first through hole on the extension part, and the circulation efficiency of the cooling working medium in the rotor cooling flow channel is improved. Through setting up fastener and second through-hole, further strengthened being connected between impeller and the main shaft, optimized the structure of rotor cooling runner, cooling working medium can leave the turbine through the second through-hole.
In the turbine, optionally, the first through holes are plural, and the plural first through holes are distributed at intervals on the extension portion in the circumferential direction of the tie rod.
And/or the second through holes are distributed on the fastening piece at intervals along the circumferential direction of the pull rod.
The arrangement can improve the outflow efficiency of the cooling working medium in the rotor cooling channel, so that the cooling efficiency of the turbine working medium is accelerated.
In the turbine described above, optionally, the axis of the first through hole and the axis of the second through hole are located on the same straight line.
The arrangement can further improve the circulation efficiency of the cooling working medium and further accelerate the cooling efficiency of the turbine.
In the turbine, optionally, a sealing member is disposed between an outer wall surface of the main shaft and an inner wall surface of the first cavity, and a passage is disposed in the sealing member and communicates the stator cooling flow passage and the rotor cooling flow passage.
The seal acts to seal the turbine rotor and turbine stator of the turbine. The utility model provides an in the turbine, the passageway is the annular chamber structure, has further injectd the flow direction of cooling working medium, ensures that the cooling working medium enters rotor cooling runner along the stator cold runner, has improved the cooling efficiency of cooling working medium to turbine.
In the turbine, optionally, a first turbine flow channel is provided in the turbine stator, a second turbine flow channel is provided in the impeller, an outlet of the first turbine flow channel is aligned with an inlet of the second turbine flow channel, and the turbine working medium flows into the second turbine flow channel from the first turbine flow channel.
The cooling working medium and the turbine working medium have the same composition, the material components and the content of each material in the cooling working medium and the turbine working medium are the same, the temperature of the cooling working medium is lower than that of the turbine working medium, and the pressure of the cooling working medium is higher than that of the turbine working medium.
The temperature of the cooling working medium is set to be lower than that of the turbine working medium, so that the cooling of the cooling working medium on the turbine can be effectively realized, and the pressure of the pressure turbine working medium of the cooling working medium is set, so that smooth circulation of the cooling working medium in the stator cooling flow passage and the rotor cooling flow passage can be ensured.
In the turbine, optionally, the stator of the turbine includes a stator housing and a stator fixing member, the stator housing is connected to the stator fixing member, the first cavity is located in the stator housing, and a heat insulating member is disposed between the stator housing and the stator fixing member.
Such an arrangement can block the radiation heat of the stator case to the stator fixing member.
In a second aspect, the present invention provides a power generation system comprising the above turbine.
The utility model provides a power generation system includes above-mentioned turbine, through setting up stator cooling runner and rotor cooling runner in the turbine, ensures that the cooling working medium can be at the inside flow of turbine, and the flow path of cooling working medium does: enters through the inlet of the stator cooling channel, then enters the rotor cooling channel, and finally leaves the turbine through the outlet of the rotor cooling channel. The turbine can generate certain heat in the working process, and the heat is transferred to the cooling working medium through the turbine based on the heat transfer principle, so that the temperature reduction in the turbine is completed. The utility model discloses improve turbine's cooling effect, improved turbine cooling efficiency, and then improved turbine generating efficiency.
The construction of the turbine and power generation system and its other objects and advantages will be more apparent from the description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a turbine according to an embodiment of the present invention;
fig. 2 is a schematic partial structural view of a portion i in fig. 1 according to an embodiment of the present invention;
FIG. 3 is a schematic view of a turbine rotor of a turbine according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a cross section a-a in fig. 3 according to an embodiment of the present invention;
fig. 5 is a schematic partial structural diagram of a part ii in fig. 3 according to an embodiment of the present invention;
fig. 6 is a schematic partial structural view of a part iii in fig. 3 according to an embodiment of the present invention.
Reference numerals:
100-turbine stator;
110 — a first cavity;
120-stator cooling flow path;
130-a first turbine flow path;
140-a stator housing;
150-stator mount;
160-insulation;
200-a turbine rotor;
210-a main shaft;
211-cooling through holes;
220-an impeller;
230-rotor cooling channels;
240-a pull rod;
241-an extension;
242 — a first via;
250-ring empty area;
251-a first annular space region;
252-a second annular space;
260-a fastener;
261-a second via;
270-a second turbine flow path;
300-a seal;
310-channel.
Detailed Description
At SCO2In a Brayton cycle power generation system, a turbine is a core component of a Brayton cycle generator set. The turbine comprises a turbine stator and a turbine rotor, a turbine working medium enters the turbine through the turbine stator and then works through the turbine rotor, and the process can generate larger heat and improve the temperature of the turbine. In order to ensure the normal operation of the system, the turbine needs to be effectively cooled,at present, the cooling of the turbine mostly adopts a natural cooling method, and part of the turbine rotor leaks to the outer side of the turbine casing. During the operation of the turbine rotor, the temperature of the outer side of the turbine casing is lower, and the heat in the turbine casing can be transferred to the outside of the turbine through the turbine rotor which leaks outwards. However, the cooling method for the turbine has low cooling efficiency and poor cooling effect, and cannot meet the cooling requirement of the turbine in the power generation system. At SCO2In the Brayton cycle power generation system, the requirement on compactness is provided for a turbine structure due to high rotating speed, intermediate parts such as a coupler are not arranged between an impeller and a main shaft of the turbine, the impeller is in direct contact with the main shaft metal, heat conduction is fast, and the temperature at the position of a rotor bearing of the main shaft is high. Since the bearing alloy and the lubricating oil can be normally used while being maintained at a certain temperature, the volume of the lubricating oil system should be increased in order to maintain the temperature of the bearing alloy and the lubricating oil within a normal range. However, an increase in the volume of the lubricating oil system increases the SCO2The power consumption of the Brayton cycle power generation system is not favorable for the compact arrangement of the unit structure, and the SCO is increased by using a large amount of lubricating oil in the power generation process2The power generation cost of a brayton cycle power generation system.
The utility model provides a turbine and power generation system, including turbine stator and turbine rotor, through having seted up stator cooling runner in the turbine stator, turbine rotor cooling runner has been seted up in the turbine rotor, can make the cooling working medium successively pass through turbine stator cooling runner and turbine rotor cooling runner, absorb the heat in the turbine when flowing, the last cooling working medium leaves the turbine through rotor cooling runner, such setting has simplified power generation system's inner structure, realize the compact of power generation system inner structure and arrange, the cooling effect of turbine among the power generation system has been improved, the cooling efficiency of turbine has been improved. The utility model provides a power generation system includes above-mentioned turbine, has improved the generating efficiency who discovers the system.
Fig. 1 is a schematic structural diagram of a turbine provided by an embodiment of the present invention, fig. 2 is a schematic partial structural diagram of a part i in fig. 1 provided by an embodiment of the present invention, fig. 3 is a schematic structural diagram of a turbine rotor of a turbine provided by an embodiment of the present invention, fig. 4 is a schematic structural diagram of a-a cross section in fig. 3 provided by an embodiment of the present invention, fig. 5 is a schematic partial structural diagram of a part ii in fig. 3 provided by an embodiment of the present invention, and fig. 6 is a schematic partial structural diagram of a part iii in fig. 3 provided by an embodiment of the present invention.
Referring to fig. 1 to 6, a turbine according to an embodiment of the present invention includes a turbine stator 100 and a turbine rotor 200, a first cavity 110 is disposed in the turbine stator, the turbine rotor 200 is located in the first cavity 110, the turbine rotor 200 includes a main shaft 210 and an impeller 220 disposed on the main shaft 210, and the main shaft 210 and the impeller 220 rotate along an axial direction of the main shaft 210 in the first cavity 110. The turbine stator 100 is provided with a stator cooling channel 120, the turbine rotor is provided with a rotor cooling channel 230, an outlet of the stator cooling channel 120 is matched with an inlet of the rotor cooling channel 230, and a cooling working medium enters the rotor cooling channel 230 through the stator cooling channel 120.
Referring to fig. 1 to 2, the direction a is a direction in which the cooling working medium enters the stator cooling channel 120 in the turbine stator 100, and based on the feature that the outlet of the stator cooling channel 120 is aligned with the inlet of the rotor cooling channel 230, the cooling working medium can enter the rotor cooling channel from the stator cooling channel 120, at this time, the cooling working medium circulates inside the turbine stator 100 and the turbine rotor 200, absorbs heat, and finally leaves the turbine through the outlet of the rotor cooling channel 230, thereby completing the cooling of the turbine.
The embodiment of the utility model provides a turbine can use at SCO2In the Brayton cycle power generation system, the temperature of the working medium at the outlet of the compressor is the lowest in the power generation system, the inlet of the stator cooling flow passage 120 is connected with the outlet of the compressor, the cooling working medium enters the stator cooling flow passage 120 after passing through the outlet of the compressor and then enters the rotor cooling flow passage 230, and the cooling working medium absorbs the heat of the turbine in the flowing process to achieve the purpose of cooling the turbine. The embodiment of the utility model provides a turbine need not to be equipped with cooling device in power generation system, has improved the SCO2The compactness of the arrangement of the structure in the Brayton cycle power generation system simultaneously realizes the effective cooling of the turbine.
The embodiment of the utility model provides a preferred centripetal turbine of turbine, the turbine working medium expands in the turbine and does work, drives impeller 220's rotation, and impeller 220 drives main shaft 210 and rotates together, and at this moment, centripetal turbine plays turboexpander's effect. In practical application, radial turbine can also be adopted to the turbine, and the embodiment of the utility model provides a do not do the restriction to this.
It should be noted that, the turbine working medium of the turbine provided by the embodiment of the present invention may be gas, such as steam, gas, air, etc., or may be liquid, such as water, oil, etc., which is not limited in this respect. At SCO2In the Brayton cycle power generation system, the turbine working medium is SCO2。
As an implementation manner, referring to fig. 3, a second cavity is disposed in the main shaft 210, a pull rod 240 is disposed in the second cavity, at least a portion of the pull rod 240 extends to the outside of the second cavity, and an impeller 220 is sleeved on the pull rod 240 located outside the second cavity. An annular area 250 is formed between the outer wall surface of the pull rod 240 and the outer wall surface of the second cavity, a cooling through hole 211 is formed in the main shaft 210, the cooling through hole 211 is communicated with the stator cooling flow passage 120 and the annular area 250, and the annular area 250 and the cooling through hole 211 form a rotor cooling flow passage 230 together. The cooling medium flows through the cooling through holes 211 from the stator cooling channel 120 and enters the annular space 250.
At least part of the pull rod 240 extends to the outside of the second cavity, the impeller 220 is sleeved on the pull rod 240, and the main shaft 210 and the impeller 220 are tightly connected through the pull rod 240, so that the work of the impeller is transmitted to the main shaft, and the expansion work process of the turbine is completed. Through seting up the annular space 250 and cooling through hole 211, cooling working medium can get into the cooling through hole 211 on the main shaft 210 through the export of stator cooling runner 120, then get into annular space 250, realize the flow of cooling working medium between main shaft 210 and impeller 220, can effectively realize the cooling of cooling working medium pair turbine rotor, cooling through hole 211 plays intercommunication stator cooling runner 120 and rotor cooling runner 230, the flow direction effect of injecing cooling working medium, cooling working medium can get into the rotor cooling runner after stator cooling runner 120, avoid the circulation of cooling working medium to other directions, the efficiency of cooling working medium has been improved. By arranging the annular space area 250, the cooling working medium can be circumferentially wrapped inside the main shaft 210 and the impeller 220 after entering the main shaft 210 and the impeller 220, so that the contact area between the cooling working medium and the main shaft 210 and the impeller 220 is increased, the conveying efficiency of the heat of the main shaft 210 and the impeller 220 to the cooling working medium is further increased, and the cooling efficiency of the cooling working medium on the turbine rotor 200 is increased.
In order to improve the working efficiency of cooling the rotor cooling channel 230, the annular space 250 should be as long as possible to reduce the temperature difference between the adjacent unit lengths of the main shaft 210 and the impeller 220, so as to reduce the thermal stress on the main shaft 210 and the impeller 220 and improve the mechanical performance of the turbine.
Referring to fig. 4, the number of the cooling through holes 211 may be multiple, and the axis of the main shaft is circumferentially arranged at intervals, and preferably, the number of the cooling through holes 211 is 6 to 8. When the number of the cooling through holes is 6, the 6 cooling through holes 211 are arranged at intervals along the circumferential direction of the main shaft 210, and the included angle between the axes of two adjacent cooling through holes 211 is 60 °. When the number of the cooling through holes is 8, as shown in fig. 4, the 8 cooling through holes 211 are arranged at intervals in the circumferential direction of the main shaft 210, and the included angle between the axes of two adjacent cooling through holes is 45 °. Of course, the number of the cooling through holes 211 may be set to other numbers, which is not limited by the embodiment of the present invention. The size of the through holes of the cooling through holes 211 may be equal or unequal, which is not limited by the embodiment of the present invention.
As an achievable embodiment, with continued reference to fig. 3, the annular region 250 is distributed along the axial extension of the main shaft 210, and at least part of the annular region 250 extends to the end of the impeller 220. The annular space 250 includes a first annular space 251 and a second annular space 252, the first annular space 251 is located between the outer wall surface of the tie bar 240 and the inner wall surface of the second cavity 252, and the second annular space 252 is located between the outer wall surface of the tie bar 240 and the inner wall surface of the impeller 220.
After the cooling working medium enters the annular region 250, the cooling working medium firstly flows through the first annular region 251 and then flows through the second annular region 252, the main shaft 210 and the impeller 220 are sequentially cooled, the annular region 250 extends to the end part of the impeller 220, the length of the circulation path of the cooling working medium in the second annular region 252 is equal to the axial length of the impeller 220, the contact area between the cooling working medium and the impeller 220 is increased, when the turbine works, heat generated by the impeller 200 can be quickly transmitted to the cooling working medium, and the cooling efficiency of the impeller 220 is improved.
Referring to fig. 3 and 5, as an embodiment, an extension 241 is provided on the outer circumferential wall of the tie rod 240 located outside the second cavity 252, and the end of the extension 241 is in close contact with the inner wall surface of the impeller 220. The extending portion 241 is provided with at least one first through hole 242, and the first through hole 242 communicates the first annular space 251 and the second annular space 252.
The extension part 241 is arranged on the pull rod 240 and is tightly abutted with the inner wall surface of the impeller 220, so that the connection reliability of the impeller 220 and the pull rod 240 is improved, the connection reliability between the impeller 220 and the main shaft 210 is improved, and the mechanical strength and the working performance of the turbine are improved. Preferably, the tight contact is preferably an interference fit for tight connection. The first through hole 242 is used for communicating the first through hole 242 with the first annular space 251 and the second annular space 252, so as to dredge a circulation path of the cooling working medium between the first annular space 251 and the second annular space 252, and the cooling working medium enters the second annular space 252 through the first through hole 242 in the first annular space 251.
In an implementation manner, referring to fig. 3 and 6, a fastener 260 is disposed on the pull rod 240 on a side near the end of the impeller 220, and the fastener 260 fixes the impeller 220 and the pull rod 240. The fastening member 260 is provided with at least one second through hole 261, and the second through hole 261 communicates the second annular space 252 and the outside.
The fastening member 260 serves to further fix the tie rod 240 and the impeller 220, further improving the mechanical strength of the turbine rotor 200 and the operating performance of the turbine. By providing at least one second through-hole 261 in the fastener, the cooling medium can exit the turbine through the second through-hole 261. The fastener 260 is located at the port of the second annular region 252, the temperature of the cooling working medium absorbing the heat of the turbine rises, the temperature reaches the highest temperature at the second through hole 261, the cooling working medium leaving through the second through hole 261 can be directly merged with the turbine working medium after the expansion work in the turbine is completed, and the cooling working medium enters the interior of the power generation system to continue to circulate, so that the working efficiency of the turbine is guaranteed.
The fastening member 260 is preferably a draw rod nut, and the draw rod nut and the draw rod 240 cooperate with each other to connect and fasten the impeller and the main shaft.
In an implementation manner, the first through holes 242 are plural, and the plural first through holes 242 are distributed on the extension portion 241 at intervals along the circumferential direction of the tie rod. And/or, there are a plurality of second through holes 261, and the plurality of second through holes 261 are distributed on the fastener 260 at intervals along the circumferential direction of the pull rod 240.
The plurality of first through holes 242 and the plurality of second through holes 261 can be used for circulating cooling working media, so that the circulation area of the cooling working media between the extension portion 241 and the fastening piece 260 can be increased, and the circulation efficiency of the cooling working media is further improved.
As an achievable embodiment, the axis of the first through hole 242 and the axis of the second through hole 261 are located on the same straight line.
By arranging the relative positions of the first through hole 242 and the second through hole 261, the circulation efficiency of the cooling working medium between the first through hole 242 and the second through hole 261 can be ensured, the cooling working medium can leave the rotor cooling channel 230 more quickly, and the cooling efficiency of the turbine is improved.
It should be noted that the axes of the first through holes 242 and the second through holes 261 may be all on the same straight line, and also a part of the first through holes 242 and a part of the second through holes 261 may be on the same straight line, which is not limited by the embodiment of the present invention. Preferably, the number of the first through holes 242 may be 6 to 8, when the number of the first through holes is 6, the 6 first through holes 242 are arranged at intervals in the circumferential direction of the extending portion 241, an included angle between axes of two adjacent first through holes 242 is 60 °, when the number of the first through holes is 8, the 8 first through holes 242 are arranged at intervals in the circumferential direction of the extending portion 241, and an included angle between axes of two adjacent first through holes 242 is 45 °. As another preferred embodiment, the number of the second through holes may be 6 to 8, when the number of the second through holes is 6, the 6 second through holes 261 are arranged at intervals in the circumferential direction of the fastener 260, an included angle between axes of two adjacent second through holes 261 is 60 °, when the number of the second through holes 261 is 8, the 8 second through holes 261 are arranged at intervals in the circumferential direction of the fastener 260, and an included angle between axes of two adjacent second through holes 261 is 45 °. Of course, the number of the first through holes 242 and the second through holes 261 may be other numbers, and the embodiment of the present invention does not specifically limit this.
In an implementation, a sealing member 300 is disposed between an outer wall surface of the main shaft 210 and an inner wall surface of the first cavity 110, and a passage 310 is disposed on the sealing member 300, and the passage 310 communicates the stator cooling flow passage 120 and the rotor cooling flow passage 230.
The seal 300 functions to seal the turbine rotor 200 and the turbine stator 100 of the turbine, and preferably, the turbine of the present embodiment provides the channel 310 in the form of an annular chamber. By arranging the channel 310, the flowing direction of the cooling working medium is further limited, the cooling working medium is ensured to enter the rotor cooling channel 230 along the stator cold channel 120, and the cooling efficiency of the cooling working medium to the turbine is improved.
It should be noted that the sealing element 300 provided in the embodiment of the present invention may be a floating ring seal, a labyrinth seal, a lubricating oil seal, a dry gas seal, or the like. At SCO2In the Brayton cycle power generation system, the sealing element 300 is preferably dry gas seal, the dry gas seal has the characteristics of less leakage amount, small abrasion, low energy consumption, simple and reliable operation and low maintenance amount, and the SCO can be met while the good sealing effect is realized2The need for a compact arrangement of the structures in a brayton cycle power generation system.
In an implementation, the turbine stator 100 is provided with a first turbine flow channel 130, the impeller is provided with a second turbine flow channel 270, an outlet of the first turbine flow channel 130 is matched with an inlet of the second turbine flow channel 270, and the turbine working medium flows into the second turbine flow channel 270 from the first turbine flow channel 130. The cooling working medium and the turbine working medium have the same composition, namely, the cooling working medium and the turbine working medium have the same material components and the same content of each material, the temperature of the cooling working medium is lower than that of the turbine working medium, and the pressure of the cooling working medium is higher than that of the turbine working medium.
By setting the temperature of the cooling working medium to be lower than that of the turbine working medium, heat generated in the working process of the turbine working medium can be transferred to the cooling working medium under the action of temperature difference, so that the cooling efficiency of the cooling working medium to the turbine can be improved. The pressure of the cooling working medium is set to be larger than that of the turbine working medium, the cooling working medium can be guaranteed to smoothly flow through the stator cooling flow channel 120 and the rotor cooling flow channel 230, the flowing speed of the cooling working medium in the turbine is guaranteed, the difference between the time taken by the turbine working medium to reach the outlet of the second turbine flow channel 270 and the time taken by the cooling working medium to reach the outlet of the rotor cooling flow channel 230 is reduced, and the working efficiency of the working medium in the power generation system is improved.
At SCO2In the Brayton cycle power generation system, the power generation system comprises a compressor, a heater, a turbine and an SCO2After being compressed by a compressor, high pressure SCO is formed2Then enters a heater for heating to become high-temperature high-pressure SCO2Then, the turbine working medium is expanded to do work in the turbine, at the moment, the embodiment of the utility model provides a turbine working medium is the high temperature high pressure SCO after the heater heating2. The inlet of the stator cooling flow passage 120 is connected with the outlet of the compressor, and the cooling working medium is high-pressure SCO at the outlet of the compressor2And has a lower temperature. In addition, due to SCO2Certain pressure loss can be caused in the process of circulation in the heater, so that the arrangement can ensure that the temperature of the cooling working medium is lower than that of the turbine working medium, and the pressure of the cooling working medium is higher than that of the turbine working medium.
Referring to fig. 2, the direction b is a direction in which the turbine working fluid enters the first turbine flow passage 130, and the turbine working fluid enters the turbine through the first turbine flow passage 130, turns in the first turbine flow passage 130, then enters the second turbine flow passage 270, expands in the second turbine flow passage 270, and drives the impeller 220 to rotate. The embodiment of the utility model provides a it is the same with turbine working medium through setting up cooling working medium, has improved turbine working medium's application scope, has avoided adding other structural device because of adding cooling working medium, has simplified power generation system's inner structure, satisfies power generation system's compact structure typeThe requirements of the arrangement. Meanwhile, the circulation efficiency of the working medium in the power generation system is improved, and the cooling efficiency of the turbine is improved. At SCO2The Brayton cycle wind power generation system, the turbine working medium and the cooling working medium are SCO2Wherein, the cooling working medium comes from the compressor, the outlet of the compressor is the lowest temperature of the working medium in the power generation system, and the compressor and the stator cooling flow passage 120 in the turbine are connected by a small pipeline, thereby avoiding the pressure loss of the cooling working medium in the flowing process.
As an implementation example, referring to fig. 1 and 2, the turbine stator 100 includes a stator housing 140 and a stator fixing member 150, the stator housing 140 is connected to the stator fixing member 150, the first cavity 110 is located in the stator housing 140, and a heat insulating member 160 is disposed between the stator housing 140 and the stator fixing member 150.
The heat insulating member 160 serves to insulate the stator case 140 from the radiant heat of the stator fixing member 150, thereby improving the cooling efficiency of the turbine. In an embodiment of the present invention, the heat insulator 160 may be filled between the stator case 140 and the stator fixing 150. The heat insulating member 160 may have a plate-shaped structure having a larger area than the opposite area between the stator fixing member 150 and the stator case 140.
On the basis, the embodiment of the utility model provides a still provide a power generation system, including the compressor with the embodiment of the utility model provides a turbine. The inlet of the stator cooling channel 120 of the turbine is connected to the outlet of the compressor.
The embodiment of the utility model provides an including compressor, heater, turbine and cooler in the power generation system, wherein, the export of compressor and the import of heater and the stator cooling runner 120's of turbine access connection, the export of heater and first turbine runner 130 are connected, the export of second turbine runner 270 and rotor cooling runner 230 and the access connection of cooler, the export of cooler and the exit linkage of compressor. The working medium is compressed by the compressor, then is pressurized and enters the heater to be heated, so that the working medium is changed into the high-temperature and high-pressure working medium, the high-temperature and high-pressure working medium enters the turbine to perform expansion work, the pressure of the expanded turbine working medium is reduced, then the turbine working medium enters the cooler, and then enters the compressor again after being cooled by the cooler. The inlet of the stator cooling channel 120 in the turbine is connected to the outlet of the compressor, part of the working medium passes through the outlet of the compressor and then enters the stator cooling channel 120 as a cooling working medium, and then enters the rotor cooling channel 230, and the cooling working medium absorbs heat generated in the expansion work process of the turbine in the flowing process, so that the purpose of cooling the turbine is achieved. Through the arrangement, the cooling effect of the turbine in the power generation system is improved, the cooling efficiency of the turbine is improved, the efficiency of the expansion work of the turbine is improved, and the power generation efficiency of the power generation system is improved.
At SCO2In the brayton cycle power generation system, the compressor is preferably connected to the stator cooling flow path 120 by a metal pipe. Based on the advantages of good cooling effect and high cooling efficiency of the turbine, the turbine has high working efficiency, thereby further improving SCO2The power generation efficiency of the Brayton cycle power generation system. Furthermore, the embodiment of the utility model provides a through setting up stator cooling runner 120 and rotor cooling runner 230 and all being located inside the turbine, the cooling working medium is accomplished the heat dissipation to the turbine at the in-process that flows, has improved the SCO2The compactness of the arrangement of all structures in the Brayton cycle power generation system. Meanwhile, the embodiment of the utility model provides a turbine and electricity generation can satisfy the SCO2The Brayton cycle generator set requires a compact structure to accommodate the main shaft 210 and the impeller 220 of the turbine at a high rotation speed. In the power generation system, the cooling effect of the generator set is not required to be ensured by increasing the volume of the lubricating oil system, the arrangement of each structure in the generator set can be more compact, and the SCO is reduced2The power consumption of the Brayton cycle power generation system reduces the power generation cost of the power generation system.
In the description of the present invention, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, an indirect connection through an intermediary, a connection between two elements, or an interactive relationship between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. The terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing and simplifying the present invention, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A turbine is characterized by comprising a turbine stator and a turbine rotor, wherein a first cavity is arranged in the turbine stator, the turbine rotor is positioned in the first cavity, the turbine rotor comprises a main shaft and an impeller arranged on the main shaft, and the main shaft and the impeller rotate along the axial direction of the main shaft in the first cavity;
the turbine stator is provided with a stator cooling flow channel, the turbine rotor is provided with a rotor cooling flow channel, an outlet of the stator cooling flow channel is matched with an inlet of the rotor cooling flow channel, and a cooling working medium flows through the stator cooling flow channel and enters the rotor cooling flow channel.
2. The turbine of claim 1, wherein a second cavity is formed in the main shaft, a pull rod is disposed in the second cavity, at least a portion of the pull rod extends to the outside of the second cavity, and the impeller is sleeved on the pull rod located outside the second cavity;
annular areas are arranged between the outer wall surface of the pull rod and the inner wall surface of the second cavity and between the outer wall surface of the pull rod and the inner wall surface of the impeller, a cooling through hole is formed in the main shaft and is communicated with the stator cooling runner and the annular areas, and the annular areas and the cooling through hole jointly form the rotor cooling runner;
and cooling working media flow through the stator cooling runner and enter the annular space area through the cooling through holes.
3. The turbine of claim 2, wherein the annular region extends along an axial extent of the main shaft and at least a portion of the annular region extends to an end of the impeller;
the annular area comprises a first annular area and a second annular area, the first annular area is located between the outer wall surface of the pull rod and the inner wall surface of the second cavity, and the second annular area is located between the outer wall surface of the pull rod and the inner wall surface of the impeller.
4. The turbine according to claim 3, wherein an extension portion is provided on an outer peripheral wall of the tie bar located outside the second chamber, an end of the extension portion being in close abutment with an inner wall surface of the impeller;
the extension part is provided with at least one first through hole which is communicated with the first annular space area and the second annular space area;
a fastener is arranged on one side of the pull rod, which is close to the end part of the impeller, and the fastener fixes the impeller and the pull rod;
at least one second through hole is formed in the fastener and communicated with the second annular space area and the outside.
5. The turbine of claim 4, wherein the first plurality of through holes are spaced apart along the circumference of the tie rod on the extension;
and/or the second through holes are distributed on the fastener at intervals along the circumferential direction of the pull rod.
6. The turbine of claim 5, wherein the axis of the first bore is collinear with the axis of the second bore.
7. The turbine of any one of claims 1-6, wherein a seal is disposed between an outer wall surface of the main shaft and an inner wall surface of the first cavity, the seal having a passage disposed therein, the passage communicating the stator cooling flow path and the rotor cooling flow path.
8. The turbine according to any one of claims 1 to 6, wherein a first turbine flow channel is provided in the turbine stator, a second turbine flow channel is provided in the impeller, an outlet of the first turbine flow channel is aligned with an inlet of the second turbine flow channel, and a turbine working medium flows from the first turbine flow channel into the second turbine flow channel;
the cooling working medium and the turbine working medium have the same composition, the temperature of the cooling working medium is lower than that of the turbine working medium, and the pressure of the cooling working medium is higher than that of the turbine working medium.
9. The turbine of any one of claims 1 to 6 wherein the turbine stator comprises a stator housing and a stator mount, the stator housing being connected to the stator mount, the first cavity being located within the stator housing, and a thermal insulator being located between the stator housing and the stator mount.
10. A power generation system comprising a turbine according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022663171.6U CN213574233U (en) | 2020-11-17 | 2020-11-17 | Turbine and power generation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022663171.6U CN213574233U (en) | 2020-11-17 | 2020-11-17 | Turbine and power generation system |
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| CN213574233U true CN213574233U (en) | 2021-06-29 |
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| CN202022663171.6U Active CN213574233U (en) | 2020-11-17 | 2020-11-17 | Turbine and power generation system |
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| CN (1) | CN213574233U (en) |
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