CN114738060A - Natural gas pressure difference driving power generation system - Google Patents
Natural gas pressure difference driving power generation system Download PDFInfo
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- CN114738060A CN114738060A CN202210439569.2A CN202210439569A CN114738060A CN 114738060 A CN114738060 A CN 114738060A CN 202210439569 A CN202210439569 A CN 202210439569A CN 114738060 A CN114738060 A CN 114738060A
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- natural gas
- power generation
- pressure difference
- gas pressure
- generation device
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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
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention discloses a natural gas pressure difference driving power generation system which comprises a natural gas pressure difference generator and a first power generation device, wherein one end of the natural gas pressure difference generator is connected with an external high-pressure natural gas storage tank through a pipeline, the other end of the natural gas pressure difference generator is connected with the first power generation device, the natural gas pressure difference generator is used for generating pressure difference at two ends of the natural gas pressure difference generator so as to increase the kinetic energy of natural gas in the natural gas pressure difference generator, and the first power generation device can generate power by using the kinetic energy of the natural gas. In the natural gas pressure difference driving power generation system, the natural gas pressure difference generator can generate pressure difference at two ends of the natural gas pressure difference generator so as to increase the kinetic energy of the natural gas in the natural gas pressure difference generator, thereby increasing the flow speed of the natural gas entering the first power generation device and improving the power generation efficiency of the first power generation device.
Description
Technical Field
The invention relates to the technical field of natural gas power generation, in particular to a natural gas pressure difference driving power generation system.
Background
The maximum design pressure of an onshore gas pipeline is as follows: in the United states: 12MPa, Russia: 7.5MPa, Germany and Italy: 8MPa, China: 10 MPa. The high-pressure natural gas transmitted by the high-pressure gas transmission main line is required to be depressurized according to the gas supply pressure requirement of downstream users at the natural gas receiving door stations and the pressure regulating stations of all cities, and then the high-pressure natural gas can be supplied to ordinary users, so that the pressure regulating stations are arranged behind the natural gas receiving door stations or the receiving door stations of all cities.
At present, the process of the natural gas gate station in China cannot efficiently utilize the pressure energy of natural gas, so a large amount of energy cannot be fully utilized.
The patent (application number: 201220358035.9) discloses a fluid pipeline pressure difference power generation device, which comprises a fluid pipeline pressure difference power generator, wherein the fluid pipeline pressure difference power generator is provided with a fluid pipeline, a kinetic energy device and a power generation component main body, the kinetic energy device comprises a shell and a centrifugal impeller, a wheel shaft of the centrifugal impeller extends out of the shell, the extending part of the wheel shaft of the centrifugal impeller is sealed by a housing which is hermetically connected on the shell, the wheel shaft of the centrifugal impeller is coupled with an output shaft through permanent magnetic force, and the output shaft is connected with a rotor shaft of the power generation component main body through a clutch; the power generation component main body is a permanent magnet generator, and an alternating current-direct current conversion circuit is connected to the power output end of the permanent magnet generator. The scheme utilizes the self kinetic energy of the fluid in the fluid pipeline to generate electricity, and the generating efficiency is not high.
Disclosure of Invention
The invention aims to overcome the technical defects and provides a natural gas differential pressure driving power generation system, which solves the technical problems that a fluid pipeline differential pressure power generation device in the prior art only utilizes the kinetic energy of fluid to generate power and has low power generation efficiency.
In order to achieve the technical purpose, the technical scheme of the invention provides a natural gas pressure difference driving power generation system which comprises a natural gas pressure difference generator and a first power generation device, wherein one end of the natural gas pressure difference generator is connected with an external high-pressure natural gas storage tank through a pipeline, the other end of the natural gas pressure difference generator is connected with the first power generation device, the natural gas pressure difference generator is used for generating pressure difference at two ends of the natural gas pressure difference generator so as to increase the kinetic energy of natural gas in the natural gas pressure difference generator, and the first power generation device can generate power by using the kinetic energy of the natural gas.
Furthermore, the natural gas pressure difference generator comprises a special-shaped pipeline and an air heater, wherein a plurality of turns are arranged on the special-shaped pipeline along the flowing direction of the natural gas and are used for increasing the kinetic energy of the natural gas; the air heater is arranged close to the outer wall of the special-shaped pipeline and used for heating the natural gas in the special-shaped pipeline to enable the natural gas to expand so as to form a low-pressure area in the special-shaped pipeline.
Furthermore, two bends are arranged on the special-shaped pipeline along the flowing direction of the natural gas, and the air heater is fixedly arranged on the outer wall of the special-shaped pipeline corresponding to the second bend.
Furthermore, the natural gas pressure difference driving power generation system further comprises a second power generation device, and the second power generation device is connected between the natural gas pressure difference generator and an external high-pressure natural gas storage tank.
Further, the second power generation device is electrically connected with the air heater and used for supplying power to the air heater.
Furthermore, the second power generation device comprises a volute, an impeller rotor rotatably arranged in an inner cavity of the volute and a turbine generator fixedly arranged at the tail end of the volute, an inlet of the volute is connected with an external high-pressure natural gas storage tank through a pipeline, and an outlet of the volute is fixedly connected with the front end of the natural gas pressure difference generator; the impeller rotor is in transmission connection with an input shaft of the turbine generator.
Furthermore, the volute and the turbine generator are fixedly provided with a shell outside for protection, the shell is provided with a first air inlet and a first air outlet, the first air inlet is communicated with an external high-pressure natural gas storage tank, and the first air outlet is communicated with an inlet of the volute.
Further, a fluid director positioned at the front end of the impeller rotor is fixedly arranged in the volute.
Furthermore, the natural gas pressure difference driving power generation system further comprises a voltage stabilizer, the first power generation device and the second power generation device are electrically connected with the voltage stabilizer, and electric energy generated by the first power generation device and the second power generation device is stabilized by the voltage stabilizer and then stored in an external energy storage device.
Further, the first power generation device includes:
a second air inlet and a second air outlet are respectively formed in the two ends of the shell, and the second air inlet is fixedly connected with the tail end of the natural air pressure difference generator;
a shaftless centrifugal rotor rotatably disposed within the housing;
the control coil and the generating coil are fixedly arranged in the shell;
the magnet group is fixedly arranged on the outer wall of the shaftless centrifugal rotor;
and the blade group comprises a plurality of blades which are fixedly arranged on the inner wall of the shaftless centrifugal rotor along the circumferential direction.
Compared with the prior art, the invention has the beneficial effects that: in the natural gas pressure difference driven power generation system, the natural gas pressure difference generator can generate pressure difference at two ends of the natural gas pressure difference generator so as to increase the kinetic energy of the natural gas in the natural gas pressure difference generator, thereby increasing the flow speed of the natural gas entering the first power generation device and improving the power generation efficiency of the first power generation device.
Drawings
FIG. 1 is a schematic structural diagram of a natural gas pressure difference driven power generation system provided by the invention;
FIG. 2 is a schematic structural view of a second power generation device in the embodiment of the invention;
fig. 3 is a schematic structural diagram of a first power generation device in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a natural gas pressure difference driving power generation system which is structurally shown in figure 1 and comprises a natural gas pressure difference generator 1 and a first power generation device 2, wherein one end of the natural gas pressure difference generator 1 is connected with an external high-pressure natural gas storage tank through a pipeline, the other end of the natural gas pressure difference generator 1 is connected with the first power generation device 2, the natural gas pressure difference generator 1 is used for generating pressure difference at two ends of the natural gas pressure difference generator to increase kinetic energy of natural gas in the natural gas pressure difference generator, and the first power generation device 2 can generate power by utilizing the kinetic energy of the natural gas.
In the natural gas pressure difference driven power generation system, the natural gas pressure difference generator 1 can generate pressure difference at two ends thereof to increase kinetic energy of natural gas inside the natural gas, so that the flow rate of the natural gas entering the first power generation device 2 is increased, and the power generation efficiency of the first power generation device 2 can be improved.
As a preferred embodiment, the natural gas pressure difference generator 1 includes a special-shaped pipeline 11 and an air heater 12, wherein a plurality of turns 110 are arranged on the special-shaped pipeline 11 along the natural gas flowing direction for increasing the kinetic energy of the natural gas; the air heater 12 is disposed closely to the outer wall of the profiled pipe 11, and is used for heating the natural gas in the profiled pipe 11 to expand so as to form a low-pressure area in the profiled pipe 11, thereby increasing the flow rate of the natural gas entering the profiled pipe 11.
By creating a low pressure zone in the profiled duct 11 by means of the air heater 12 and the pressure difference at the bend 110, the flow rate of the natural gas is increased, increasing its kinetic energy.
As a specific embodiment, two bends 110 are arranged on the shaped pipeline 11 along the natural gas flowing direction, and the air heater 12 is fixedly arranged on the outer wall of the shaped pipeline 11 corresponding to the second bend 110.
In a preferred embodiment, the natural gas pressure difference driven power generation system further includes a second power generation device 3, and the second power generation device 3 is connected between the natural gas pressure difference generator 1 and an external high-pressure natural gas storage tank.
The second power generation device 3 and the first power generation device 2 can perform secondary power generation by using the kinetic energy of natural gas, so that the utilization rate and the power generation efficiency of natural gas kinetic energy are improved.
In a preferred embodiment, the second power generation device 3 is electrically connected to the air heater 12, and is configured to supply power to the air heater 12.
As a preferred embodiment, the natural gas pressure difference driven power generation system further includes a voltage stabilizer (not shown in the figure), the first power generation device 2 and the second power generation device 3 are both electrically connected to the voltage stabilizer, and the electric energy generated by the first power generation device 2 and the second power generation device 3 is stabilized by the voltage stabilizer and then stored in an external energy storage device.
As a preferred embodiment, as shown in fig. 2, the second power generation device 3 in the embodiment of the present invention is a schematic structural diagram, the second power generation device 3 includes a volute 31, an impeller 32 rotatably disposed in an inner cavity of the volute 31, and a turbine generator 33 fixedly disposed at a tail end of the volute 31, an inlet of the volute 31 is connected to an external high-pressure natural gas storage tank through a pipeline, and an outlet is fixedly connected to a front end of the natural gas pressure difference generator 1; the impeller rotor 32 is in driving connection with the input shaft of the turbine generator 33.
The natural gas high-speed airflow entering the volute 31 from the high-pressure natural gas storage tank pushes the impeller rotor 32 to rotate, converts the kinetic energy of the natural gas into mechanical energy, and drives the turbine generator 33 to generate electricity.
As a preferred embodiment, an outer casing 34 is fixedly disposed outside the volute 31 and the turbine generator 33 for protection, a first air inlet 341 and a first air outlet are formed in the outer casing 34, the first air inlet 341 is communicated with an external high-pressure natural gas storage tank, and the first air outlet is communicated with an inlet of the volute 31.
As a preferred embodiment, a flow guider (not shown in the figure) positioned at the front end of the impeller rotor 32 is further fixedly arranged in the volute casing 31, and the flow guider can achieve the flow dividing and guiding effects on the natural gas in the volute casing 31, achieve non-impact air intake, and reduce the kinetic energy loss of the natural gas. In a specific embodiment, a nozzle is fixedly arranged at the tail end of the flow guider and used for increasing the flow rate of the natural gas.
As a preferred embodiment, as shown in fig. 3, the first power generation device 2 in the embodiment of the present invention is a schematic structural diagram, where the first power generation device 2 includes a housing 21, a shaftless centrifugal rotor 22, a control coil 23, a power generation coil 24, a magnet group 25, and a blade group 26, where two ends of the housing 21 are respectively provided with a second air inlet 211 and a second air outlet 212, and the second air inlet 211 is fixedly connected to a tail end of the natural gas pressure difference generator 1; the shaftless centrifugal rotor 22 is rotationally arranged in the shell 21, the control coil 23 and the power generation coil 24 are fixedly arranged in the shell 21, the control coil 23 is used for controlling the rotating speed of the shaftless centrifugal rotor 22, when the rotating speed of the shaftless centrifugal rotor 22 is too high, the control coil 23 is electrified to decelerate the shaftless centrifugal rotor 22, and the speed of natural gas flow at a user end is stable; the magnet set 25 and the blade set 26 are respectively fixed on the outer wall and the inner wall of the shaftless centrifugal rotor 22, and the blade set 26 includes a plurality of blades fixed on the inner wall of the shaftless centrifugal rotor 22 along the circumferential direction. In a preferred embodiment, the blades 26 are provided with six centrifugal arc-shaped shaftless blades, so that the surfaces of the blades 26 are uniformly impacted by the airflow to reduce the kinetic energy loss of the natural gas.
After being accelerated by the natural gas pressure difference generator 1, natural gas enters the inside of the housing 21 from the second gas inlet 211, and blows the blade group 26 to drive the shaftless centrifugal rotor 22 and the magnet group 25 adhered to the outer wall of the shaftless centrifugal rotor 22 to rotate, the magnetic field of the magnet group 25 is cut by the generating coil 24, so that current is generated in the generating coil 24 to realize a generating function.
In other embodiments, the first power generation device 2 and the second power generation device 3 may be other power generation equipment, such as an expansion generator.
For the convenience of understanding the present invention, the operation principle of the present solution is described in detail below with reference to fig. 1 to 3:
the natural gas transmitted from a remote base station is detected to be normal by an air flow meter and then transferred to an external high-pressure natural gas storage tank for temporary storage and preheating. After preheating is completed, the natural gas pressure at that time is remeasured by the air flow meter. The natural gas then enters the second power generation device 3 through a pipeline, and the second power generation device 3 converts the kinetic energy of the natural gas into electric energy and stores the electric energy in an external energy storage device. The natural gas enters the special-shaped pipeline 11 after passing through the second power generation device 3, when the natural gas entering the special-shaped pipeline 11 passes through the bend 110, the dynamic pressure of the natural gas is increased due to the change of the flow speed of the natural gas, so that the natural gas flows in the special-shaped pipeline 11 at an accelerated speed, when the natural gas passes through the position of the special-shaped pipeline 11 corresponding to the air heater 12, the natural gas expands due to heating and forms a low-pressure area at the position, so that a large pressure difference is formed between the position and the front end of the special-shaped pipeline 11, so that the kinetic energy of the natural gas is increased due to the accelerated flow of the natural gas again, and the kinetic energy can be converted into more electric energy by the first power generation device 2, so that the power generation efficiency is improved.
The natural gas pressure difference driven power generation system provided by the invention has the following beneficial effects:
(1) in the natural gas pressure difference driven power generation system, the natural gas pressure difference generator 1 can generate pressure difference at two ends thereof to increase the kinetic energy of natural gas inside the natural gas, so that the flow rate of the natural gas entering the first power generation device 2 is increased, and the power generation efficiency of the first power generation device 2 can be improved;
(2) the natural gas pressure difference generator 1 comprises a special-shaped pipeline 11 and an air heater 12, a plurality of turns 110 are arranged on the special-shaped pipeline 11 along the flowing direction of natural gas, and the air heater 12 is tightly attached to the outer wall of the special-shaped pipeline 11. By creating a low pressure zone inside the profiled duct 11 by means of the air heater 12, and by being able to create a pressure difference at the bend 110, the flow rate of the natural gas is increased, increasing its kinetic energy;
(3) the second power generation device 3 and the first power generation device 2 can perform secondary power generation by using the kinetic energy of natural gas, so that the utilization rate and the power generation efficiency of natural gas kinetic energy are improved.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The natural gas pressure difference driving power generation system is characterized by comprising a natural gas pressure difference generator and a first power generation device, wherein one end of the natural gas pressure difference generator is connected with an external high-pressure natural gas storage tank through a pipeline, the other end of the natural gas pressure difference generator is connected with the first power generation device, the natural gas pressure difference generator is used for generating pressure difference at two ends of the natural gas pressure difference generator to increase the kinetic energy of natural gas in the natural gas pressure difference generator, and the first power generation device can utilize the kinetic energy of the natural gas to generate power.
2. The natural gas pressure difference driven power generation system as claimed in claim 1, wherein the natural gas pressure difference generator comprises a special-shaped pipeline and an air heater, and a plurality of turns are arranged on the special-shaped pipeline along the flowing direction of natural gas for increasing the kinetic energy of the natural gas; the air heater is arranged close to the outer wall of the special-shaped pipeline and used for heating the natural gas in the special-shaped pipeline to enable the natural gas to expand so as to form a low-pressure area in the special-shaped pipeline.
3. The natural gas pressure difference driven power generation system as claimed in claim 2, wherein two turns are arranged on the special-shaped pipeline along the natural gas flow direction, and the air heater is fixedly arranged on the outer wall of the special-shaped pipeline corresponding to the second turn.
4. The differential natural gas pressure driven power generation system of claim 2, further comprising a second power generation device connected between the differential natural gas pressure generator and an external high pressure natural gas storage tank.
5. The power generation system driven by natural gas pressure difference as claimed in claim 4, wherein the second power generation device is electrically connected with the air heater for supplying power to the air heater.
6. The natural gas pressure difference driven power generation system according to claim 4, wherein the second power generation device comprises a volute, an impeller rotor rotatably arranged in an inner cavity of the volute, and a turbine generator fixedly arranged at the tail end of the volute, an inlet of the volute is connected with an external high-pressure natural gas storage tank through a pipeline, and an outlet of the volute is fixedly connected with the front end of the natural gas pressure difference generator; the impeller rotor is in transmission connection with an input shaft of the turbine generator.
7. The natural gas pressure difference driven power generation system according to claim 6, wherein a housing is fixedly arranged outside the volute and the turbine generator for protection, a first gas inlet and a first gas outlet are formed in the housing, the first gas inlet is communicated with an external high-pressure natural gas storage tank, and the first gas outlet is communicated with an inlet of the volute.
8. The natural gas pressure difference driven power generation system according to claim 6, wherein a flow guide device is further fixedly arranged in the volute and is positioned at the front end of the impeller rotor.
9. The natural gas pressure difference driven power generation system according to claim 4, further comprising a voltage stabilizer, wherein the first power generation device and the second power generation device are electrically connected to the voltage stabilizer, and the electric energy generated by the first power generation device and the second power generation device is stabilized by the voltage stabilizer and then stored in an external energy storage device.
10. The natural gas pressure differential driven power generation system of claim 1, wherein the first power generation device comprises:
a second air inlet and a second air outlet are respectively formed in the two ends of the shell, and the second air inlet is fixedly connected with the tail end of the natural air pressure difference generator;
a shaftless centrifugal rotor rotatably disposed within the housing;
the control coil and the generating coil are fixedly arranged in the shell;
the magnet group is fixedly arranged on the outer wall of the shaftless centrifugal rotor;
and the blade group comprises a plurality of blades which are fixedly arranged on the inner wall of the shaftless centrifugal rotor along the circumferential direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210439569.2A CN114738060A (en) | 2022-04-25 | 2022-04-25 | Natural gas pressure difference driving power generation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210439569.2A CN114738060A (en) | 2022-04-25 | 2022-04-25 | Natural gas pressure difference driving power generation system |
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| CN202210439569.2A Pending CN114738060A (en) | 2022-04-25 | 2022-04-25 | Natural gas pressure difference driving power generation system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0973082A1 (en) * | 1998-07-16 | 2000-01-19 | Ewald Hennel | Method for controlling a fluid pressure |
| CN202325702U (en) * | 2011-11-17 | 2012-07-11 | 重庆川然节能技术有限公司 | Natural gas pressure difference power generation system self-adapting to rear-end load change |
| CN105003306A (en) * | 2015-07-31 | 2015-10-28 | 北京市燃气集团有限责任公司 | Internal electricity generation system for gas pipeline and automatic control method |
| CN109184816A (en) * | 2018-10-26 | 2019-01-11 | 南充西南石油大学设计研究院有限责任公司成都分公司 | The shaftless power generator of culvert type |
| WO2020028650A1 (en) * | 2018-08-01 | 2020-02-06 | Crusoe Energy Systems Inc. | Systems and methods for generating and consuming power from natural gas |
-
2022
- 2022-04-25 CN CN202210439569.2A patent/CN114738060A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0973082A1 (en) * | 1998-07-16 | 2000-01-19 | Ewald Hennel | Method for controlling a fluid pressure |
| CN202325702U (en) * | 2011-11-17 | 2012-07-11 | 重庆川然节能技术有限公司 | Natural gas pressure difference power generation system self-adapting to rear-end load change |
| CN105003306A (en) * | 2015-07-31 | 2015-10-28 | 北京市燃气集团有限责任公司 | Internal electricity generation system for gas pipeline and automatic control method |
| WO2020028650A1 (en) * | 2018-08-01 | 2020-02-06 | Crusoe Energy Systems Inc. | Systems and methods for generating and consuming power from natural gas |
| CN109184816A (en) * | 2018-10-26 | 2019-01-11 | 南充西南石油大学设计研究院有限责任公司成都分公司 | The shaftless power generator of culvert type |
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