CN210622876U - Brayton cycle power generation system - Google Patents
Brayton cycle power generation system Download PDFInfo
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- CN210622876U CN210622876U CN201921421585.9U CN201921421585U CN210622876U CN 210622876 U CN210622876 U CN 210622876U CN 201921421585 U CN201921421585 U CN 201921421585U CN 210622876 U CN210622876 U CN 210622876U
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Abstract
The utility model relates to the technical field of power generation systems, and discloses a Brayton cycle power generation system, which comprises a compressor, a heater and a turbine which are connected in sequence, and also comprises a sealing shell, a heat regenerator and at least one ejector, wherein the compressor and the turbine are arranged in the sealing shell, the sealing shell is connected with an injected fluid inlet of the ejector, and an outlet of the compressor is connected with an injection source fluid inlet of the ejector; the outlet of the ejector is connected with the inlet of the first heat exchange side of the heat regenerator, and the outlet of the first heat exchange side of the heat regenerator is connected with the inlet of the heater; the outlet of the turbine is connected with the inlet of the second heat exchange side of the regenerator, and the outlet of the second heat exchange side of the regenerator is connected with the inlet of the compressor. The Brayton cycle power generation system utilizes the sealing shell to convert the dynamic seal of the rotating machine into static seal, and simultaneously mixes the leaked working medium and the main flow working medium through the ejector, thereby fully recovering the heat of the leaked working medium.
Description
Technical Field
The utility model relates to a power generation system technical field especially relates to a brayton cycle power generation system.
Background
Supercritical CO2The Brayton cycle has become a hot spot of domestic and foreign research, has extremely high thermal efficiency and power-to-volume ratio, is a main technical route for replacing steam cycle in the future, but because of supercritical CO2Low viscosity like gas and high density like liquid, resulting in supercritical CO2The problems that dynamic sealing difficulty is high, operation working conditions deviate from design values and the like and are difficult to solve appear in Brayton cycle, and the sealing difficulty caused by high rotating speed and small fluid viscosity of rotary machinery is found through reason analysisParticularly, the turbine has high operation temperature and high operation pressure, the sealing difficulty is higher than that of a compressor, and the sealing requirements cannot be met by the common dry gas sealing, labyrinth sealing and other modes. Meanwhile, the problem of deviation of the operation condition is also that the heat exchange equipment cannot operate according to the design condition, a heat exchange mode that multiple micro channels (with the diameter of 1-2 mm) are connected in parallel is generally adopted to ensure high pressure bearing capacity (more than 20 MPa), the commonly used micro-tube shell-and-tube heat exchangers, printed circuit board heat exchangers and the like have the problem that inlets correspond to hundreds of through-flow pipelines, the flow speed is reduced due to excessive leakage of working media, the unevenness of flow distribution among the micro channels is also aggravated, and the actual flow deviation of each channel can reach more than 30%.
The conventional solution is to first use an intermittent make-up system, which is turned on as soon as the pressure is below a certain limit, by filling with high-pressure supercritical CO2Maintaining a steady operating flow in the system, but this solution puts the flow in the compressor and turbine in a fluctuating condition from time to time, resulting in severe deviation of the unit efficiency from the nominal value and even stall risk. Secondly, add flow equalizing plate or throttling element in heat exchanger head position, lead to the total resistance of system further to increase. The measures can increase the power consumption of the compressor, cause the flow in the system to obviously fluctuate, directly influence the cycle efficiency and the economy, and even cause the problems of damage, failure and the like of the rotary mechanical equipment.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a brayton cycle power generation system for solve among the current brayton cycle power generation system problem that rotary machine dynamic seal is difficult, easily leaks, leak the working medium with the recovery and utilization.
The embodiment of the utility model provides a brayton cycle power generation system, including compressor, heater and the turbine that connects gradually, still include seal housing, regenerator and at least one ejector, the compressor with the turbine all sets up in the seal housing, seal housing is connected in the ejector be drawn fluid inlet, the export of compressor is connected in the ejector draw source fluid inlet of ejector; the outlet of the ejector is connected with the inlet of the first heat exchange side of the heat regenerator, and the outlet of the first heat exchange side of the heat regenerator is connected with the inlet of the heater; and the outlet of the turbine is connected with the inlet of the second heat exchange side of the heat regenerator, and the outlet of the second heat exchange side of the heat regenerator is connected with the inlet of the compressor.
The ejector comprises at least one stage of ejection unit, and each stage of ejection unit comprises an ejection pipe and a driving air inlet assembly; the driving air inlet assembly comprises a driving air inlet pipe, a nozzle and a driving expansion section which are sequentially connected, and the driving expansion section extends into the injection pipe; the drive intake pipe is equipped with a plurality of air intake branch pipes in circumference, every air intake branch pipe's import all connect in the export of compressor, every air intake branch pipe's export all with the drive intake pipe is tangent.
The air inlet branch pipes are distributed along the axis of the driving air inlet pipe in a centrosymmetric mode.
The injection pipe comprises an injection section, a mixing contraction section and a diffusion section which are sequentially connected, and the driving expansion section is arranged in the injection section.
The ejector comprises a plurality of stages of ejection units, and the ejection pipes of the adjacent two stages of ejection units are mutually connected; the outlet of the diffusion section of the upper stage of the injection unit is connected with the inlet of the injection section of the lower stage of the injection unit.
And swirl vanes are arranged on the inner wall surface of the injection section in the circumferential direction.
Wherein, the inlet of the first heat exchange side of the regenerator is uniformly provided with a plurality of micro channels.
The heat regenerator comprises a first heat exchange side, a second heat exchange side and a cooler, wherein the cooler also comprises a cooler, an inlet of the cooler is connected to an outlet of the second heat exchange side of the heat regenerator, and an outlet of the cooler is connected to an inlet of the compressor.
The sealing shell is internally filled with Brayton cycle working medium with preset pressure.
The compressor and the turbine adopt magnetic suspension bearings or air bearing.
The embodiment of the utility model provides a brayton cycle power generation system, including compressor, heater and the turbine that connects gradually, still include seal housing, regenerator and at least one ejector, utilize seal housing to carry out the full seal to turbine and compressor, the working medium that leaks from turbine and compressor enters seal housing, seal housing connects in the end of being drawn of ejector to regard as the fluid that is drawn as leaking the working medium; the outlet of the compressor is connected to the injection end of the injector so as to take the main flow working medium as an injection source, and the low-pressure leakage working medium enters the heat regenerator after being mixed and boosted under the action of high-speed jet flow of the high-pressure main flow working medium. This brayton cycle power generation system utilizes sealed casing to turn into rotary machine's movive seal static seal, will leak working medium and mainstream working medium through the ejector simultaneously and mix, fully retrieves the heat of leaking the working medium, has simplified gaseous discontinuity replenishing device by a wide margin, has realized the zero leakage of system, has guaranteed heat exchanger and rotary machine simultaneously and has all operated in the design operating mode, reaches the effect that equipment operation stability, economic nature and security in the system promoted in step.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed 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 diagram of a brayton cycle power generation system in an embodiment of the invention;
fig. 2 is a schematic structural diagram of an ejector according to an embodiment of the present invention;
FIG. 3 is a side view of a drive inlet pipe and an inlet manifold in an embodiment of the invention;
fig. 4 is a diagram illustrating a result of flow distribution of micro-channels of a regenerator according to an embodiment of the present invention;
description of reference numerals:
1: a compressor; 11: a motor; 2: a heater;
21: a heat source; 3: a turbine; 31: a generator;
4: sealing the housing; 5: a heat regenerator; 6: an ejector;
61: an injection pipe; 611: an injection section; 612: a mixed shrinkage section;
613: a diffusion section; 614: a swirl vane; 62: driving the air intake assembly;
621: driving an air inlet pipe; 622: a nozzle; 623: a drive expansion section;
624: an intake branch pipe; 7: a cooler; 8: leakage of working fluid;
9: a main flow of working fluid.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "first" and "second" are used for clearly indicating the numbering of the product parts and do not represent any substantial difference unless explicitly stated or limited otherwise. The directions of "up", "down", "left" and "right" are all based on the directions shown in the attached drawings. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.
It is to be understood that, unless otherwise expressly specified or limited, the term "coupled" is used broadly, and may, for example, refer to directly coupled devices or indirectly coupled devices through intervening media. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.
Fig. 1 is the schematic diagram of a brayton cycle power generation system in the embodiment of the utility model, fig. 2 is the utility model provides an in the embodiment of the structure schematic diagram of an ejector, as shown in fig. 1-fig. 2, the utility model provides a brayton cycle power generation system, including compressor 1, heater 2 and the turbine 3 that connects gradually, still include seal housing 4, regenerator 5 and at least one ejector 6, compressor 1 and turbine 3 all set up in seal housing 4, seal housing 4 is connected in ejector 6 by ejector fluid inlet, the exit linkage of compressor 1 is in ejector source fluid inlet of ejector 6. An outlet of the ejector 6 is connected to an inlet of a first heat exchange side of the regenerator 5, and an outlet of the first heat exchange side of the regenerator 5 is connected to an inlet of the heater 2. The outlet of the turbine 3 is connected to the inlet of the second heat exchange side of the regenerator 5, and the outlet of the second heat exchange side of the regenerator 5 is connected to the inlet of the compressor 1.
Specifically, a rotating shaft of the compressor 1 is connected with a motor 11 to form a compressor unit; the pivot of turbine 3 is connected with generator 31, constitutes turbine generator set, and motor 11 and generator 31 all are connected with outside water cooling system (not shown in the figure), and water cooling system sets up outside sealed housing 4, can directly adopt the current water cooling system of power plant, only need with motor 11 and generator 31 through condenser tube be connected to water cooling system can, guarantee that the motor operation is not overtemperature. The heater 2 may adopt an indirect heat exchanger, an inlet of a first heat exchanging side of the heater 2 is connected to an outlet of a first heat exchanging side of the regenerator 5, and an outlet of the first heat exchanging side of the heater 2 is connected to an inlet of the turbine 3. The second heat exchange side of the heater 2 may employ conventional fuel combustion, solar heat collection or other heat generating energy source as the heat source 21.
The sealed housing 4 may be an overall housing that encloses the compressor unit and the turbine-generator unit together. The sealed housing 4 may also be a plurality of separate sub-housings, the compressor unit and the turbine generator unit being housed in their respective sub-housings. In this embodiment, the sealing housing 4 is specifically described as two sub-housings, and the rest of the cases are similar and will not be described again. The temperature of the leaked working medium fluid 8 can be reduced without adopting a cooling device in the sealed shell 4, so that the heat of the system can be fully recovered.
The heat regenerator 5 can adopt an indirect heat exchanger, a first heat exchange side of the heat regenerator 5 is connected in series between the compressor 1 and the heater 2, and a second heat exchange side of the heat regenerator 5 is connected in series between the turbine 3 and the compressor 1. The number of the ejectors 6 can be one or more, when the number of the ejectors 6 is multiple, the ejectors 6 are connected in parallel, that is, an ejected fluid inlet of each ejector 6 is connected to the sealed housing 4, an ejection source fluid inlet of each ejector 6 is connected to an outlet of the compressor 1, and an outlet of each ejector 6 is connected to an inlet of the first heat exchange side of the regenerator 5. The ejector 6 can be a single-stage ejector or a multi-stage ejector. In this embodiment, a single-stage ejector is taken as an example for description, and the rest of the cases are similar to the above, and are not described again. The Brayton cycle working medium used in the embodiment can be supercritical CO2Helium or nitrogen, in this case supercritical CO2For the sake of example, the rest of the cases are similar and will not be described again.
In operation, the main flow of working fluid 9 (high pressure supercritical CO)2) The liquid flows out of an outlet of the compressor 1 and enters an injection source fluid inlet of the injector 6 to serve as an injection source; at the same time, the shaft end of the compressor 1 will leak part of the leaked working medium fluid 8 (low-pressure CO)2Gas) into the left-hand sealed housing 4, the shaft end of the turbine 3 will also leak part of the leakage working fluid 8 into the right-hand sealed housing 4. The leakage working medium fluid 8 is converged and then led out to an injected fluid inlet of the injector 6 to be used as injected fluid by arranging the lead-out pipes on the two sealing shells 4 respectively. The main flow working medium fluid 9 with high pressure and high speed carries low pressure leakage working medium fluid 8 under the action of jet flow, the speed is reduced and the pressure is increased to the pressure required by the system operation, the main flow working medium fluid enters the first heat exchange side of the heat regenerator 5, the heat is heated by utilizing the heat of exhaust, the main flow working medium fluid is heated and heated by the heater 2, then the main flow working medium fluid enters the turbine 3, the energy contained in the working medium fluid is converted into mechanical energy, and the mechanical energy is converted into electric energy by the generator 31And (6) outputting. The exhaust gas of the turbine 3 enters the second heat exchange side of the heat regenerator 5 to heat the compressed gas so as to improve the heat efficiency, and finally enters the compressor 1 again to perform the next cycle.
The brayton cycle power generation system provided by the embodiment comprises a compressor, a heater and a turbine which are sequentially connected, and further comprises a sealing shell, a heat regenerator and at least one ejector, wherein the sealing shell is used for fully sealing the turbine and the compressor, a working medium leaked from the turbine and the compressor enters the sealing shell, and the sealing shell is connected to an ejected end of the ejector so as to take the leaked working medium as an ejected fluid; the outlet of the compressor is connected to the injection end of the injector so as to take the main flow working medium as an injection source, and the low-pressure leakage working medium enters the heat regenerator after being mixed and boosted under the action of high-speed jet flow of the high-pressure main flow working medium. This brayton cycle power generation system utilizes sealed casing to turn into rotary machine's movive seal static seal, will leak working medium and mainstream working medium through the ejector simultaneously and mix, fully retrieves the heat of leaking the working medium, has simplified gaseous discontinuity replenishing device by a wide margin, has realized the zero leakage of system, has guaranteed heat exchanger and rotary machine simultaneously and has all operated in the design operating mode, reaches the effect that equipment operation stability, economic nature and security in the system promoted in step.
Further, as shown in fig. 2 and 3, the ejector 6 includes at least one stage of ejector unit, that is, the ejector 6 may be a single-stage ejector or a multi-stage ejector. Each stage of injection unit comprises an injection pipe 61 and a driving air inlet assembly 62. The driving air inlet assembly 62 comprises a driving air inlet pipe 621, a nozzle 622 and a driving expansion section 623 which are sequentially connected, and the driving expansion section 623 extends into the injection pipe 61. The driving air inlet pipe 621 is provided with a plurality of air inlet branch pipes 624 in the circumferential direction, an inlet of each air inlet branch pipe 624 is connected to an outlet of the compressor 1, and an outlet of each air inlet branch pipe 624 is tangent to the driving air inlet pipe 621.
Specifically, the jet source incidence mode of the ejector 6 is changed from the existing direct current incidence to tangential incidence, the main flow working medium fluid 9 is introduced into the ejector 6 through two or more air inlet branch pipes 624 tangent to the driving air inlet pipe 621 to form a strong tangential flow field, then the main flow working medium fluid sequentially passes through the contraction section, the nozzle 622 and the driving expansion section 623 of the driving air inlet pipe 621 to accelerate, a high-speed jet with strong tangential secondary flow is formed at the outlet of the driving expansion section 623, then the leaked working medium fluid 8 is carried under the action of strong shearing force, the mixing is carried out in the ejector pipe 61, the speed is reduced and the pressure is increased to the pressure required by the system operation, and then the jet enters the inlet of the first heat exchange side of the heat regenerator 5.
Meanwhile, the jet flow source fluid (namely the main flow working medium fluid 9) and the injected gas (namely the leakage working medium fluid 8) have strong rotational flow secondary flow effect, and the injected gas is pressurized while being cooled, so that the injected gas is wholly greatly contracted, and the main flow supercritical CO is pulled and accelerated2Moving to the outside. Meanwhile, a large-range central reflux area is caused by the action of strong rotational flow, so that the supercritical fluid is deflected and cannot directly rush into a micro channel opposite to the seal head inlet, and further more fluid can be conveyed to the edge micro channel.
In the heat regenerator 5, the injected leakage working medium fluid 8 has high temperature and low pressure, and is mixed with the main flow working medium fluid 9 in the mixing and boosting process. On one hand, the density difference aggravates the action of strong rotational flow centrifugal force, the high-density main flow working medium fluid 9 is thrown out towards the edge of the inlet end socket of the heat regenerator 5, the injected leakage working medium fluid 8 is positioned outside the main flow working medium fluid 9, the temperature is reduced and the pressure is increased in the mixing process to cause the specific volume to suddenly drop to generate the integral shrinkage phenomenon, and the main flow working medium fluid 9 is pulled to accelerate to move towards the edge of the inlet end socket of the heat regenerator 5; on the other hand, at the inlet of the first heat exchange side of the regenerator 5, the central backflow phenomenon occurs in the rotational flow expansion process of the air flow, so that the flow direction of the fluid in the central area is deflected, and more fluid is conveyed to the edge micro-channel. The two aspects together result in a reduction in the flow difference between the individual microchannels. In a specific embodiment, the microchannel flow distribution of regenerator 5 results, see fig. 4, with maximum flow deviation no greater than 6% as shown in fig. 4, while fully recovering working fluid and heat from leaking working fluid 8.
The embodiment utilizes the comprehensive effects of high-speed jet flow effect, rotational flow secondary flow, fluid pressure boosting and contraction, central area backflow and the likeSupercritical CO for recovering leakage of rotary machine2At the same time, most of the supercritical CO is mixed2The method is directly conveyed to the edge micro-channel, and the problems of shaft end dynamic seal leakage and uneven flow distribution of the heat exchanger in the system are synchronously solved.
Further, as shown in fig. 3, the plurality of intake branch pipes 624 are arranged in a central symmetrical manner along the axis of the drive intake pipe 621. Specifically, the number of the inlet branch pipes 624 may be two or more, and in this embodiment, four inlet branch pipes 624 are illustrated as an example, and the four inlet branch pipes 624 are uniformly distributed along the circumferential direction of the driving inlet pipe 621 and are in the form of a four-corner tangential circle.
Further, the injection pipe 61 includes an injection section 611, a mixing contraction section 612 and a diffusion section 613 which are connected in sequence, and the driving expansion section 623 is disposed in the injection section 611. Specifically, the injection section 611 and the mixing and shrinking section 612 are both reducing pipes, and the diffusion section 613 is a reducing pipe. The main flow working medium fluid 9 passes through the nozzle 622 and the driving expansion section 623, forms high-speed tangential flow at the outlet of the driving expansion section 623, and then forms an injection effect of strong shearing force in the injection section 611. Furthermore, the front end of the injection section 611 is further provided with a circular tube transition section for installing the driving air inlet assembly 62, so that the injection tube 61 is coaxially sleeved outside the driving air inlet assembly 62.
Furthermore, the ejector 6 may be a multi-stage ejector, that is, it includes a plurality of sets of ejector units, the ejector pipes 61 of two adjacent sets of ejector units are connected to each other, and the outlet of the diffuser section 613 of the previous ejector unit is connected to the inlet of the ejector section 611 of the next ejector unit. More specifically, the circular tube transition section of the first-stage injection unit is connected to the sealed housing 4, the diffusion section 613 of the upper-stage injection unit is connected to the circular tube transition section of the lower-stage injection unit, and the diffusion section 613 of the last-stage injection unit is connected to the inlet of the first heat exchange side of the heat regenerator 5.
Further, as shown in fig. 2, the inner wall surface of the injection section 611 is mounted with swirl vanes 614 in the circumferential direction. Specifically, the swirl direction of the swirl vanes 614 and the main flow working fluid 9 (i.e., high pressure supercritical CO) driving the outlet of the expansion section 6232Fluid) in a uniform direction. After entering the injection section 611, the leaked working medium fluid 8 flows through the swirl vanes 614Under the action of the pressure sensor, a tangential velocity is generated and enters the mixing contraction section 612 together with the main flow working medium fluid 9. At this time, the injected leakage working medium fluid 8 is located outside the main flow working medium fluid 9, and the gas is in a strong rotational flow state, and directly enters the inlet of the first heat exchange side of the heat regenerator 5 after being subjected to speed reduction and pressure increase by the mixing contraction section 612 and the pressure expansion section 613.
Further, an inlet of the first heat exchange side of the regenerator 5 is uniformly provided with a plurality of fine passages (not shown in the figure). Specifically, the regenerator 5 may be a micro-tube shell-and-tube heat exchanger or a printed circuit board heat exchanger, and inlets of the micro-tube shell-and-tube heat exchanger or the printed circuit board heat exchanger correspond to hundreds of micro-channels. The high pressure-bearing capacity (more than 20 MPa) can be ensured by arranging a heat exchange mode in which a plurality of micro channels (with the diameter of 1 mm-2 mm) are connected in parallel.
Furthermore, the end socket structure of the inlet of the first heat exchange side of the regenerator 5 may be hemispherical or rounded to square, so that the strong rotational flow can be fully developed and expanded in the space.
Further, the compressor 1 and the turbine 3 are in a coaxial configuration or a split-shaft configuration. In particular, the compressor unit and the turbine generator unit may be configured coaxially, i.e. sharing the electric machine 11 or the generator 31; it is also possible to have a split-shaft configuration, i.e. not sharing the electric machine 11 or the generator 31. In this embodiment, a split-axis configuration is adopted.
Further, as shown in fig. 1, a cooler 7 is further included, an inlet of the cooler 7 is connected to an outlet of the second heat exchanging side of the regenerator 5, and an outlet of the cooler 7 is connected to an inlet of the compressor 1. The exhaust gas of the turbine 3 is cooled by the provision of a cooler.
Further, the compressor 1 and the turbine 3 adopt magnetic suspension bearings or air bearings. Thus leaked CO2Can not be polluted by other working media, so the waste gas can be directly recycled without purification.
Further, the shaft ends of the compressor 1 and the turbine 3 are both labyrinth-sealed. Because the dry gas seal has the problems of complex system and more auxiliary equipment, the simple labyrinth seal is adopted in the embodiment.
In a particular embodiment, there is also provided a method of using the brayton cycle power generation system described above, comprising:
before the operation of the Brayton cycle power generation system, vacuumizing the sealed shell 4, and injecting a Brayton cycle working medium until the actually measured pressure value in the sealed shell 4 reaches a preset pressure value;
and operating the Brayton cycle power generation system, and keeping the difference value between the actual measurement pressure value in the sealed shell 4 and the preset pressure value smaller than or equal to the preset pressure difference value.
Specifically, before operation, the sealed shell 4 is filled with 1MPa of normal-temperature high-purity CO2The pressure in the sealing shell 4 is always kept at about 1MPa in the operation process, the leaked working medium fluid 8 is reduced to about 1MPa from more than 10MPa after being leaked at the dynamic sealing section, the temperature is also obviously reduced after being reduced, the highest temperature is not more than 200 ℃, the sealing shell 4 does not have the problems of temperature-resistant materials and dynamic sealing, the back pressure in the sealing shell 4 can obviously reduce the internal and external sealing pressure difference, and the static sealing under the operation environment can completely achieve zero leakage.
In a specific embodiment, the turbine 3 and the compressor 1 are first sealed completely by the seal housing 4, and a back pressure of 1MPa can be maintained in the seal housing 4 to significantly reduce the pressure difference between the inside and the outside of the seal, thereby reducing the leakage. Then the leakage gas is led into the inlet of the injected fluid of the injector 6 through an eduction tube, the high-pressure fluid at the outlet of the compressor 1 is used as a jet source, the jet source at the inlet is set to be strong tangential rotational flow, the leakage working medium fluid 8 is directly recovered without temperature reduction and purification through the one-stage or multi-stage injection effect, and simultaneously, the effects of rotational flow centrifugal force, external expansion effect, leakage gas pressure boosting and contraction and the like are comprehensively utilized to enable more supercritical CO to be obtained2And the fine channel is conveyed to the edge of an inlet end socket of the first heat exchange side of the heat regenerator 5, so that the problem of uneven flow distribution of the fine channel is solved.
According to the embodiment, the brayton cycle power generation system provided by the utility model, wherein brayton cycle power generation system includes compressor, heater and turbine that connect gradually, still includes seal housing, regenerator and at least one ejector, utilizes seal housing to carry out the full seal to turbine and compressor, and the working medium that leaks from turbine and compressor enters into seal housing, and seal housing connects in the end of being drawn of ejector to regard as the fluid that is drawn by the leakage working medium; the outlet of the compressor is connected to the injection end of the injector so as to take the main flow working medium as an injection source, and the low-pressure leakage working medium enters the heat regenerator after being mixed and boosted under the action of high-speed jet flow of the high-pressure main flow working medium. This brayton cycle power generation system utilizes sealed casing to turn into rotary machine's movive seal static seal, will leak working medium and mainstream working medium through the ejector simultaneously and mix, fully retrieves the heat of leaking the working medium, has simplified gaseous discontinuity replenishing device by a wide margin, has realized the zero leakage of system, has guaranteed heat exchanger and rotary machine simultaneously and has all operated in the design operating mode, reaches the effect that equipment operation stability, economic nature and security in the system promoted in step.
Further, the Brayton cycle power generation system recovers CO leaked at the shaft end2Meanwhile, the flow distribution of each micro channel is uniform, and other devices such as a booster pump, a resistance piece and the like are not introduced. Firstly, the system realizes full recovery and zero leakage of leaked gas and heat by additionally arranging a pressure-bearing container and an injection device; secondly, the rotary machines such as the compressor, the turbine and the like can operate under a stable working condition, the phenomenon that the flow fluctuates constantly is avoided, and the high efficiency and the safety of equipment are ensured; thirdly, the design allowance of the heat exchanger is greatly released, and the volume, the weight and the cost of the heat exchanger are obviously reduced. In conclusion, the efficiency, the safety and the economy of the whole system can be obviously improved.
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 it; 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 technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A Brayton cycle power generation system comprises a compressor, a heater and a turbine which are sequentially connected, and is characterized by further comprising a sealed shell, a heat regenerator and at least one ejector, wherein the compressor and the turbine are arranged in the sealed shell, the sealed shell is connected to an ejected fluid inlet of the ejector, and an outlet of the compressor is connected to an ejection source fluid inlet of the ejector;
the outlet of the ejector is connected with the inlet of the first heat exchange side of the heat regenerator, and the outlet of the first heat exchange side of the heat regenerator is connected with the inlet of the heater; and the outlet of the turbine is connected with the inlet of the second heat exchange side of the heat regenerator, and the outlet of the second heat exchange side of the heat regenerator is connected with the inlet of the compressor.
2. The brayton cycle power generation system of claim 1, wherein said eductor comprises at least one stage of eductor unit, each stage of said eductor unit comprising an eductor tube and a drive air intake assembly; the driving air inlet assembly comprises a driving air inlet pipe, a nozzle and a driving expansion section which are sequentially connected, and the driving expansion section extends into the injection pipe; the drive intake pipe is equipped with a plurality of air intake branch pipes in circumference, every air intake branch pipe's import all connect in the export of compressor, every air intake branch pipe's export all with the drive intake pipe is tangent.
3. A brayton cycle power generation system in accordance with claim 2, wherein said plurality of intake manifolds are arranged in a central symmetrical manner along the axis of said drive intake duct.
4. The brayton cycle power generation system of claim 2, wherein the ejector tube comprises an ejector section, a mixing contraction section and a diffuser section which are connected in sequence, and the driving expansion section is arranged in the ejector section.
5. The brayton cycle power generation system of claim 4, wherein said ejector comprises a plurality of stages of said ejector units, said ejector tubes of adjacent stages of said ejector units being interconnected; the outlet of the diffusion section of the upper stage of the injection unit is connected with the inlet of the injection section of the lower stage of the injection unit.
6. A Brayton cycle power generation system in accordance with claim 4, wherein swirl vanes are mounted circumferentially on an inner wall surface of the injection section.
7. A brayton cycle power generation system in accordance with claim 1, wherein an inlet of the first heat exchange side of the regenerator is uniformly provided with a plurality of minute passages.
8. A brayton cycle power generation system in accordance with claim 1, further comprising a cooler, an inlet of said cooler being connected to an outlet of said second heat exchanging side of said regenerator, an outlet of said cooler being connected to an inlet of said compressor.
9. The brayton cycle power generation system of claim 1, wherein the sealed housing is filled with a brayton cycle working fluid at a predetermined pressure.
10. A brayton cycle power generation system in accordance with any one of claims 1 to 9, wherein said compressor and said turbine employ magnetic or air bearings.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110469376A (en) * | 2019-08-29 | 2019-11-19 | 中国船舶重工集团公司第七一九研究所 | Brayton cycle electricity generation system and method |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110469376A (en) * | 2019-08-29 | 2019-11-19 | 中国船舶重工集团公司第七一九研究所 | Brayton cycle electricity generation system and method |
| CN110469376B (en) * | 2019-08-29 | 2024-01-16 | 中国船舶重工集团公司第七一九研究所 | Brayton cycle power generation system and method |
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