CN112282871A - Symmetrically-arranged high-speed double-turbine distributed excess pressure power generation system - Google Patents
Symmetrically-arranged high-speed double-turbine distributed excess pressure power generation system Download PDFInfo
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- CN112282871A CN112282871A CN202010971607.XA CN202010971607A CN112282871A CN 112282871 A CN112282871 A CN 112282871A CN 202010971607 A CN202010971607 A CN 202010971607A CN 112282871 A CN112282871 A CN 112282871A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D13/00—Combinations of two or more machines or engines
- F01D13/02—Working-fluid interconnection of machines or engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/165—Controlling means specially adapted therefor
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Abstract
The invention discloses a symmetrically-arranged high-speed double-turbine distributed excess pressure power generation system, which belongs to the field of distributed excess pressure power generation and comprises a first isolation valve, a flow distribution valve, a second isolation valve, a second three-way switching valve, a high-speed permanent magnet motor, a second turbine expander, a first three-way switching valve, a safety valve and a bypass isolation valve; the first turbo expander and the second turbo expander are arranged in a reverse symmetrical mode, and the high-speed permanent magnet motor is arranged between the first turbo expander and the second turbo expander. Through the symmetrically arranged double-turbine structure, the balance of the axial force of the high-speed bearing is realized, the flux of working media is increased, and the power output of the system is improved; through the switching of the isolation valve and the three-way switching valve, the series and parallel operation of the double-turbine expansion machines is realized, so that the system has better adaptability to the scenes with higher steam quality and larger pressure difference.
Description
Technical Field
The invention relates to the field of distributed excess pressure power generation, in particular to a symmetrically-arranged high-speed double-turbine distributed excess pressure power generation system.
Background
With the continuous increase of energy-saving and environmental protection pressure, small-scale distributed industrial small boilers with low efficiency and high pollution are gradually replaced by centralized district heating systems, but the problem of mismatching of supply and demand parameters of steam is usually faced, and huge waste of energy is caused. At present, a temperature and pressure reducing device is the most widely applied method for solving the problem of mismatching of supply and demand parameters, but the method causes the loss of steam exergy and wastes the work capacity of the steam, and a patent application with the publication number of CN 110118106A provides a distributed residual pressure power generation system and a working method based on a high-efficiency radial turbine, and the temperature and pressure reducing device is replaced by a high-speed radial turbine to recover the energy loss of a unit with mismatching of supply and demand parameters.
In order to keep the differential pressure power generation system of the radial turbine to have efficient power output and solve the problem that the balance of the axial force is the key for maintaining the safe and stable operation of the system, a patent with the publication number of CN 210087393U provides an axial force balancing device for a single-stage radial turbine expansion machine, and the patent effectively reduces the axial force generated when the single-stage radial turbine expansion machine operates; the operating large-scale power plant turbine generally adopts a turbine expander type which is symmetrically arranged, but the system rotating speed is not high, generally 3000 revolutions or 1500 revolutions, and the system rotating speed depends on the pole pair number of the generator. When the pressure difference between the supply and demand sides is large, the energy recovery capacity of the single-stage radial turbine expander is limited, and the steam flux is small, so that the output power of the system is low, and the application and popularization of the high-speed radial turbine distributed residual pressure power generation system are limited; at present, a double-turbine expander scheme aiming at a residual pressure power generation system of a radial turbine does not exist, and through the turbine expanders which are symmetrically arranged, the axial force of a high-speed bearing can be eliminated, the steam flow rate is increased, the output power of the system is increased, and meanwhile, the safe and stable operation of the residual pressure power generation system of the high-speed radial turbine is maintained.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a high-speed double-turbine distributed residual pressure power generation system which is symmetrically arranged, has reasonable structural design and aims at solving the problems that a single-stage radial turbine expander is low in output power, a high-pressure-difference energy supply system is low in energy recovery efficiency and axial force cannot be solved during operation.
The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides a symmetrical arrangement's high-speed double turbine distributing type excess pressure power generation system which characterized in that: the system comprises a first isolation valve, a flow distribution valve, a second isolation valve, a second three-way switching valve, a high-speed permanent magnet motor, a second turbo expander, a first three-way switching valve, a safety valve and a bypass isolation valve; the first turbine expander and the second turbine expander are arranged in a reverse symmetrical mode and used for balancing axial force generated by high-speed movement of the turbine, increasing the flow rate of working media and increasing the power output of a system, and the high-speed permanent magnet motor is arranged between the first turbine expander and the second turbine expander; the first isolation valve is connected with a high-pressure steam inlet pipeline, the flow distribution valve is respectively connected with inlets of the first isolation valve and the first turbo expander, the second isolation valve is respectively connected with the flow distribution valve and the second three-way switching valve, the second three-way switching valve is connected with an inlet of the second turbo expander, the first three-way switching valve is respectively connected with an outlet of the first turbo expander, the second three-way switching valve and a low-pressure steam outlet pipeline, the safety valve is arranged on the low-pressure steam outlet pipeline, and the bypass isolation valve is arranged on a pipeline between the high-pressure steam inlet pipeline and the low-pressure steam outlet pipeline.
Furthermore, the first three-way switching valve is controlled to lead the outlet of the first turbine expander to the low-pressure steam outlet pipeline by opening the second isolation valve, and the flow distribution valve equally distributes the steam flow entering the first turbine expander and the second turbine expander to realize the parallel operation of the first turbine expander and the second turbine expander which are symmetrically arranged. The flow distribution valve evenly distributes the steam flow entering the two turbine expansion machines, realizes the parallel operation of the symmetrically arranged high-speed double turbines, and simultaneously increases the system output and balances the axial force of the high-speed bearing.
Furthermore, the first three-way switching valve is controlled to lead the outlet of the first turbo expander to the second three-way switching valve and then to the second turbo expander by closing the second isolation valve, so that the first turbo expander and the second turbo expander which are symmetrically arranged are connected in series. When the steam quality is higher and the pressure difference is larger, the high-speed double turbines which are symmetrically arranged can be switched through the valve, so that the full utilization of pressure difference resources is realized.
Furthermore, in order to improve the power generation efficiency of the residual pressure power generation system, a technical route that a high-speed bearing directly drives a high-speed permanent magnet motor is adopted.
Furthermore, the bypass isolation valve is opened when the symmetrically arranged high-speed double-turbine distributed residual pressure power generation system fails, and the first isolation valve is closed at the same time, so that high-temperature high-pressure steam in the high-pressure steam inlet pipeline is directly discharged to the low-pressure steam outlet pipeline.
Furthermore, the safety valve is opened when the pressure is higher than the pressure limit value of the low-pressure heat supply pipe network, so that the safe and stable operation of the low-pressure heat supply pipe network is ensured.
Compared with the prior art, the invention has the following advantages and effects:
1. compared with a single-stage high-speed radial turbine expander, the high-speed double-turbine expander structure which is symmetrically arranged in the system realizes the balance of the axial force of the high-speed bearing;
2. the double-turbine expander structure is adopted, the steam flow is increased, and the output power of the system can be improved;
3. the system enhances the adaptability of the radial residual pressure power generation system to the load change of the pressure difference resource, can adjust the working mode of the double turbines according to the condition of the pressure difference resource, when the steam quality is higher and the pressure difference is larger, the double turbine expanders are switched to operate in a series connection mode from a parallel connection mode, and the axial force deviation generated during the series connection operation is borne by the axial thrust bearing of the high-speed permanent magnet motor.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the system of the present invention.
Fig. 2 is a schematic structural diagram of a parallel operation mode of the system of the present invention.
Fig. 3 is a schematic diagram of the serial operation mode of the system of the present invention.
In the figure: the high-pressure steam turbine comprises a high-pressure steam inlet pipeline 1, a first isolation valve 2, a flow distribution valve 3, a second isolation valve 4, a second three-way switching valve 5, a high-speed permanent magnet motor 6, a high-speed bearing 7, a second turbo expander 8, a first turbo expander 9, a first three-way switching valve 10, a low-pressure steam outlet pipeline 11, a safety valve 12 and a bypass isolation valve 13.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Example 1.
The high-speed double-turbine distributed residual pressure power generation system is symmetrically arranged in a parallel operation mode.
The embodiment discloses a high-speed double-turbine distributed residual pressure power generation system (hereinafter referred to as the system) which is symmetrically arranged in a parallel operation mode, and the system designs a symmetrically arranged high-speed double-turbine expansion machine structure aiming at the problems that a single-stage radial turbine expansion machine is low in output power and cannot solve axial force during operation.
Referring to fig. 1 and 2, the system comprises a first isolation valve 2, a flow distribution valve 3, a second isolation valve 4, a second three-way switching valve 5, a high-speed permanent magnet motor 6, a second turbo expander 8, a first turbo expander 9, a first three-way switching valve 10, a safety valve 12 and a bypass isolation valve 13; the first turbo expander 9 and the second turbo expander 8 are symmetrically arranged in the reverse direction, and the high-speed permanent magnet motor 6 is arranged between the first turbo expander 9 and the second turbo expander 8; an isolation valve 2 is connected with a high-pressure steam inlet pipeline 1, a flow distribution valve 3 is respectively connected with inlets of an isolation valve 2 and a turbine expander 9, an isolation valve 4 is respectively connected with the flow distribution valve 3 and a three-way switching valve 5, the three-way switching valve 5 is connected with an inlet of a turbine expander 8, the three-way switching valve 10 is respectively connected with an outlet of the turbine expander 9, the three-way switching valve 5 and a low-pressure steam outlet pipeline 11, a safety valve 12 is arranged on the low-pressure steam outlet pipeline 11, and a bypass isolation valve 13 is arranged on a pipeline between the high-pressure steam inlet pipeline 1 and the low-pressure steam outlet pipeline 11.
Specifically, the system controls the first three-way switching valve 10 to lead the outlet of the first turbo expander 9 to the low-pressure steam outlet pipeline 11 by opening the second isolation valve 4, and the flow distribution valve 3 equally distributes the steam flow entering the first turbo expander 9 and the second turbo expander 8, so that the first turbo expander 9 and the second turbo expander 8 which are symmetrically arranged run in parallel.
In this embodiment, the first three-way switching valve 10 controls the outlet of the first turbo expander 9 to be communicated to the low-pressure steam outlet pipe 11, and closes the pipe leading to the second three-way switching valve 5.
In this embodiment, the flow distribution valve 3 is normally opened to equally distribute the steam flow into the first turbo expander 9 and the second turbo expander 8.
In this embodiment, during normal operation, the second isolation valve 4 is opened, and the bypass isolation valve 13 is closed.
In this embodiment, the bypass isolation valve 13 is opened when the system fails, and the first isolation valve 2 is closed at the same time, so that the high-temperature high-pressure steam in the high-pressure steam inlet pipeline 1 is directly discharged to the low-pressure steam outlet pipeline 11.
In this embodiment, the safety valve 12 is opened when the pressure is higher than the pressure limit of the low-pressure heat supply pipe network, so as to ensure the safe and stable operation of the low-pressure heat supply pipe network.
In the embodiment, the system balances the axial force of the high-speed bearing 7 by parallelly operating the symmetrically arranged high-speed double turbines, avoids the occurrence of faults such as bearing locking and the like, ensures the safe and stable operation of the system, increases the flow of working media by the double turbine structure, and improves the power output of the system.
In specific application, the working method of the system comprises the following steps:
the method comprises the following steps: high-pressure steam enters a flow distribution valve 3 from a high-pressure steam inlet pipeline 1 through a first isolation valve 2, and the flow of the high-pressure steam entering a first turbine expansion machine 9 and a second turbine expansion machine 8 is evenly distributed through the flow distribution valve 3;
step two: high-pressure steam with equal flow is led to a first turbine expander 9 and a second turbine expander 8 which are symmetrically arranged, the turbine expanders drive a high-speed bearing 7 to rotate, and electric power is generated through a high-speed permanent magnet generator 6;
step three: the exhaust steam after the first turbine expander 9 and the second turbine expander 8 do work is conveyed to a heat user through a low-pressure steam outlet pipeline 11.
Example 2.
The high-speed double-turbine distributed residual pressure power generation system is symmetrically arranged in a series operation mode.
The embodiment of the invention discloses a high-speed double-turbine distributed excess pressure power generation system (hereinafter referred to as the system) which is symmetrically arranged in a series operation mode, and the system aims at the problems that a single-stage radial turbine expander is low in output power, the energy recovery efficiency of the system is not matched with high differential pressure supply and demand is low, and axial force cannot be solved during operation, and especially aims at the operation working conditions that a high-pressure steam inlet pipeline 1 is high in steam quality and large in differential pressure.
Referring to fig. 1 and 3, the system comprises a first isolation valve 2, a flow distribution valve 3, a second isolation valve 4, a second three-way switching valve 5, a high-speed permanent magnet motor 6, a second turbo expander 8, a first turbo expander 9, a first three-way switching valve 10, a safety valve 12 and a bypass isolation valve 13; the first turbo expander 9 and the second turbo expander 8 are symmetrically arranged in the reverse direction, and the high-speed permanent magnet motor 6 is arranged between the first turbo expander 9 and the second turbo expander 8; an isolation valve 2 is connected with a high-pressure steam inlet pipeline 1, a flow distribution valve 3 is respectively connected with inlets of an isolation valve 2 and a turbine expander 9, an isolation valve 4 is respectively connected with the flow distribution valve 3 and a three-way switching valve 5, the three-way switching valve 5 is connected with an inlet of a turbine expander 8, the three-way switching valve 10 is respectively connected with an outlet of the turbine expander 9, the three-way switching valve 5 and a low-pressure steam outlet pipeline 11, a safety valve 12 is arranged on the low-pressure steam outlet pipeline 11, and a bypass isolation valve 13 is arranged on a pipeline between the high-pressure steam inlet pipeline 1 and the low-pressure steam outlet pipeline 11.
Specifically, the first three-way switching valve 10 is controlled by closing the second isolation valve 4, so that the outlet of the first turbo expander 9 is led to the second three-way switching valve 5 and then led to the second turbo expander 8, and the first turbo expander 9 and the second turbo expander 8 which are symmetrically arranged are connected in series.
In this embodiment, the first three-way switching valve 10 controls the outlet of the first turboexpander 9 to be communicated to the second three-way switching valve 5, and closes the low-pressure steam outlet pipeline 11.
In this embodiment, during normal operation, the second isolation valve 4 is closed, and the bypass isolation valve 13 is closed.
In this embodiment, the high-pressure steam in the high-pressure steam inlet pipeline 1 completely enters the first turbo expander 9 through the flow distribution valve 3, the exhaust steam of the first turbo expander 9 enters the second turbo expander 8 after entering the second three-way switching valve 5 through the first three-way switching valve 10, and the exhaust steam of the second turbo expander 8 enters the low-pressure steam outlet pipeline 11.
In this embodiment, the bypass isolation valve 13 is opened when the system fails, and the first isolation valve 2 is closed at the same time, so that the high-temperature high-pressure steam in the high-pressure steam inlet pipeline 1 is directly discharged to the low-pressure steam outlet pipeline 11.
In this embodiment, the safety valve 12 is opened when the pressure is higher than the pressure limit of the low-pressure heat supply pipe network, so as to ensure the safe and stable operation of the low-pressure heat supply pipe network.
In this embodiment, this system has balanced high-speed bearing 7's axial force through the high-speed double turbine of series operation symmetrical arrangement, because No. 9 turbo expanders of turbine and No. two 8 steam parameters of turbo expander are different, can cause the phenomenon that partial axial force can't offset, bears the weight of the safe and stable operation of assurance unit through the axial thrust bearing that sets up in the high-speed permanent-magnet machine 6 this moment. The system can recover steam pressure difference resources to the maximum extent and realize energy recycling especially under the operating condition that the steam quality of the high-pressure steam inlet pipeline 1 is high and the pressure difference is large.
In specific application, the working method of the system comprises the following steps:
the method comprises the following steps: high-pressure steam enters the flow distribution valve 3 from the high-pressure steam inlet pipeline 1 through the first isolation valve 2, and the high-pressure steam passing through the flow distribution valve 3 enters the first turboexpander 9 due to the closing of the second isolation valve 4;
step two: the exhaust steam of the first turbine expander 9 enters the second three-way switching valve 5 through the first three-way switching valve 10 and then enters the second turbine expander 8, and the turbine expander drives the high-speed bearing 7 to rotate and generates electric power through the high-speed permanent magnet generator 6;
step three: the exhaust steam after the work of the second turbine expansion machine 8 is delivered to a heat user through a low-pressure steam outlet pipeline 11.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (5)
1. The utility model provides a symmetrical arrangement's high-speed double turbine distributing type excess pressure power generation system which characterized in that: the system comprises a first isolation valve (2), a flow distribution valve (3), a second isolation valve (4), a second three-way switching valve (5), a high-speed permanent magnet motor (6), a second turbo expander (8), a first turbo expander (9), a first three-way switching valve (10), a safety valve (12) and a bypass isolation valve (13); the first turbine expander (9) and the second turbine expander (8) are arranged in a reverse symmetrical mode and used for balancing axial force generated by high-speed movement of a turbine, increasing working medium flux and increasing system power output, and the high-speed permanent magnet motor (6) is arranged between the first turbine expander (9) and the second turbine expander (8); the first isolation valve (2) is connected with a high-pressure steam inlet pipeline (1), the flow distribution valve (3) is respectively connected with inlets of the first isolation valve (2) and the first turbo expander (9), the second isolation valve (4) is respectively connected with the flow distribution valve (3) and the second three-way switching valve (5), the second three-way switching valve (5) is connected with an inlet of the second turbo expander (8), the first three-way switching valve (10) is respectively connected with an outlet of the first turbo expander (9), the second three-way switching valve (5) and a low-pressure steam outlet pipeline (11), the safety valve (12) is arranged on the low-pressure steam outlet pipeline (11), and the bypass isolation valve (13) is arranged on a pipeline between the high-pressure steam inlet pipeline (1) and the low-pressure steam outlet pipeline (11).
2. The symmetrically arranged high speed dual turbine distributed overbalance power generation system of claim 1, wherein: the outlet of the first turbine expansion machine (9) is led to a low-pressure steam outlet pipeline (11) by opening the second isolation valve (4) and controlling the first three-way switching valve (10), and the flow distribution valve (3) equally distributes the steam flow entering the first turbine expansion machine (9) and the second turbine expansion machine (8), so that the parallel operation of the first turbine expansion machine (9) and the second turbine expansion machine (8) which are symmetrically arranged is realized.
3. The symmetrically arranged high speed dual turbine distributed overbalance power generation system of claim 1, wherein: by closing the second isolating valve (4), the first three-way switching valve (10) is controlled to lead the outlet of the first turbo expander (9) to the second three-way switching valve (5) and then to the second turbo expander (8), so that the first turbo expander (9) and the second turbo expander (8) which are symmetrically arranged are connected in series.
4. The symmetrically arranged high speed dual turbine distributed overbalance power generation system of claim 1, wherein: and the bypass isolation valve (13) is opened when the symmetrically arranged high-speed double-turbine distributed residual pressure power generation system fails, and the first isolation valve (2) is closed at the same time, so that high-temperature high-pressure steam in the high-pressure steam inlet pipeline (1) is directly discharged to the low-pressure steam outlet pipeline (11).
5. The symmetrically arranged high speed dual turbine distributed overbalance power generation system of claim 1, wherein: the safety valve (12) is opened when the pressure is higher than the pressure limit value of the low-pressure heat supply network pipe so as to ensure the safe and stable operation of the low-pressure heat supply network pipe.
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| CN202010971607.XA CN112282871A (en) | 2020-09-16 | 2020-09-16 | Symmetrically-arranged high-speed double-turbine distributed excess pressure power generation system |
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| CN202010971607.XA CN112282871A (en) | 2020-09-16 | 2020-09-16 | Symmetrically-arranged high-speed double-turbine distributed excess pressure power generation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115199347A (en) * | 2022-07-26 | 2022-10-18 | 北京全四维动力科技有限公司 | Air turbine system and method of operating the same |
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| CN101839154A (en) * | 2010-04-28 | 2010-09-22 | 北京力通高科技发展有限公司 | Distributed type residual-heat/residual-pressure power generation system and distributed type residual-heat/residual-pressure power generation method |
| CN103277153A (en) * | 2013-05-08 | 2013-09-04 | 南京溧马新能源科技有限公司 | Organic Rankine cycle heat engine device based on multiple expansion machines |
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| CN111594280A (en) * | 2020-06-23 | 2020-08-28 | 南京天加热能技术有限公司 | Double-turbine gas suspension ORC power generation system and control method |
| CN111594283A (en) * | 2020-06-23 | 2020-08-28 | 南京天加热能技术有限公司 | Two-stage turbine gas suspension ORC power generation system and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115199347A (en) * | 2022-07-26 | 2022-10-18 | 北京全四维动力科技有限公司 | Air turbine system and method of operating the same |
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