CN108868904B - Hydraulic variable motor speed regulating system for recovering natural gas residual pressure energy - Google Patents
Hydraulic variable motor speed regulating system for recovering natural gas residual pressure energy Download PDFInfo
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- CN108868904B CN108868904B CN201810611277.6A CN201810611277A CN108868904B CN 108868904 B CN108868904 B CN 108868904B CN 201810611277 A CN201810611277 A CN 201810611277A CN 108868904 B CN108868904 B CN 108868904B
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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
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/002—Reciprocating-piston liquid engines details; components parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C1/00—Reciprocating-piston liquid engines
- F03C1/26—Reciprocating-piston liquid engines adapted for special use or combined with apparatus driven thereby
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Abstract
The invention relates to a hydraulic variable motor speed regulating system for recovering residual pressure energy of natural gas, which comprises an expander, a hydraulic pump, an energy accumulator, a variable motor, a controller and a natural gas pipeline, wherein the expander is connected with the hydraulic pump; the expander is connected with the hydraulic pump and is placed in a natural gas pipeline; the output end of the hydraulic pump is connected with a one-way valve, the output end of the one-way valve is provided with a safety valve, an energy accumulator and a variable motor, the safety valve and the energy accumulator are connected in parallel, and the energy accumulator and the variable motor are connected in series; the variable motor is provided with a controller and a generator; the output end of the variable motor is provided with an oil cooler, a filter and an oil tank. Its advantages are: the hydraulic variable motor speed regulating system for recovering the residual pressure energy of the natural gas has high utilization rate of the residual pressure of the natural gas, and can be used for intensively recovering the residual pressure of a plurality of natural gas pipelines and intensively generating power frequency alternating current.
Description
Technical Field
The invention relates to the technical field of natural gas excess pressure energy recycling, in particular to a hydraulic variable motor speed regulating system for recycling natural gas excess pressure energy.
Background
The shale gas 'well factory' platform is usually provided with 4-8 gas production wells, the natural gas pressure of the gas production well pipeline is as high as 100MPa, and the pressure of the oil gas treatment plant inlet pipeline is between 10MPa and 12 MPa. In order to meet the pressure requirements of oil and gas treatment plants, high-pressure natural gas is generally subjected to step-by-step pressure reduction treatment by a pressure reduction valve group. During the depressurization process, a large part of pressure energy is lost in the high-pressure natural gas, and the high-pressure natural gas is completely wasted. Therefore, if effective measures can be taken to intensively recover the natural gas residual pressure energy of a plurality of gas production wells of the natural shale gas 'well factory' platform, the pressure energy lost in the pressure regulating process is reduced, and the method has important significance for reducing resource waste and improving enterprise benefits.
Chinese patent document CN 205064001U, CN 206129326U, CN 203892871U, the weather energy-taking scheme of the above patent: natural gas pressure energy → expander → gearbox → generator, but has the following drawbacks and deficiencies: whether the generator directly generates power frequency alternating current is not described.
Chinese patent CN 205064001U, CN 206129326U, CN 203892871U uses a speed change gear box, but has the following defects and shortcomings: the price is high, and the cost is high because the use needs to be overhauled for 5 to 7 years.
The power generation recovery device used in chinese patent document CN 205064001U, CN 206129326U, CN 203892871U, CN-105927491 a can only recover residual pressure energy in a natural gas pipeline, and cannot recover energy to generate power in a centralized manner.
In summary, a hydraulic variable motor speed regulation transmission system with high natural gas excess pressure utilization rate and flexible transmission is needed for intensively recovering the excess pressure of a plurality of natural gas pipelines of a shale gas well factory and intensively generating power frequency alternating current. However, no report is found about the hydraulic variable motor speed regulation system at present.
Disclosure of Invention
The invention aims to provide a hydraulic variable motor speed regulation transmission system with high natural gas residual pressure utilization rate and flexible transmission, which is used for intensively recovering residual pressure of a plurality of natural gas pipelines of a shale gas well factory and intensively generating power frequency alternating current aiming at the defects in the prior art.
The invention further aims to provide application of the speed-regulating transmission system of the hydraulic variable-displacement motor.
In order to achieve the purpose, the invention adopts the technical scheme that:
a hydraulic variable motor speed regulating system for recovering residual pressure energy of natural gas comprises an expander, a hydraulic pump, an energy accumulator, a variable motor, a controller and a natural gas pipeline; the expander is connected with the hydraulic pump and is placed in a natural gas pipeline; the number of the natural gas pipelines is at least one, each natural gas pipeline is internally provided with an expander and a hydraulic pump which are matched, and each hydraulic pump is connected in parallel; the output end of the hydraulic pump is connected with a one-way valve, the output end of the one-way valve is provided with a safety valve, an energy accumulator and a variable motor, the safety valve and the energy accumulator are connected in parallel, and the energy accumulator and the variable motor are connected in series; the variable motor is provided with a controller and a generator; the output end of the variable motor is provided with an oil cooler, a filter and an oil tank; the oil cooler and the filter are connected in series, and the oil cooler is connected with the oil tank.
As a preferable technical scheme, the hydraulic variable motor speed regulating system comprises two types of a closed type hydraulic variable motor speed regulating system or an open type hydraulic variable motor speed regulating system.
As a preferred technical scheme, the natural gas pipeline comprises a wellhead gas production tree pipeline and a natural conveying pipeline.
As a preferable technical scheme, the oil cooler is connected in parallel, the oil supplementing device is communicated with an oil tank, and the flushing valve is connected with the hydraulic pump.
As a preferable technical scheme, the oil tank is connected with the hydraulic pump through a one-way valve.
As a preferable technical scheme, the natural gas pipeline, the hydraulic pump, the expander and the one-way valve form an energy conversion unit.
As a preferred technical solution, the number of the energy conversion units is at least one.
As a preferable technical scheme, the generator, the variable motor and the controller form a power frequency power generation unit.
As a preferred technical scheme, the number of the power frequency power generation units is at least one.
In order to achieve the second object, the invention adopts the technical scheme that:
the hydraulic variable motor speed regulating system is applied to the application of the shale gas well factory multiple natural gas pipeline residual pressure centralized recovery and the centralized power frequency alternating current generation.
The invention has the advantages that:
1. the closed hydraulic variable motor speed regulating system for recovering the residual pressure energy of the natural gas has high utilization rate of the residual pressure of the natural gas, and can be used for intensively recovering the residual pressure of a plurality of natural gas pipelines and intensively generating power frequency alternating current.
2. The natural gas pipeline is provided with the expanders and the hydraulic pumps which are matched with the natural gas pipeline in quantity, and the residual pressure energy recovery of a plurality of natural gas pipelines is realized. The centralized energy recovery power generation is convenient to realize.
3. The check valve only allows the liquid flow to flow in one direction in the pipeline, and high-pressure oil generated by a plurality of pumps can be output in parallel.
4. The safety valve has the function that when the pressure of the system exceeds a set safety pressure value, oil of the system overflows a part of oil return tank through a valve port, and the abnormal system pressure caused by overlarge system or element damage due to overhigh natural gas residual pressure is prevented.
5. The accumulator is an energy storage element in the hydraulic system, stores redundant pressure oil, releases the oil to the supply system when needed, supplements the flow and pressure of the system, buffers and absorbs pressure pulsation caused by sudden increase of the residual pressure of natural gas, ensures that the pressure and the flow of the system are in a stable range, and is convenient for the controller to realize the dynamic adjustment function.
6. The variable motor is driven to rotate by high-pressure oil and is dynamically adjusted by the controller, so that the motor outputs a constant rotating speed which is not influenced by the change of natural gas residual pressure.
7. The generator selects the magnetic pole pairs according to the constant output rotating speed of the variable motor, and the variable motor with the constant rotating speed drives the generator to rotate to generate power frequency alternating current.
8. The oil cooler, the filter, the flushing valve, the oil tank and the oil supplementing device are all hydraulic auxiliary elements, and stable operation of the system is guaranteed.
9. The hydraulic variable motor speed regulating system can adopt effective measures to recover pressure energy lost in the natural gas pressure regulating process, and has important significance for reducing resource waste and improving enterprise benefits.
Drawings
Fig. 1 is a structural block diagram of a closed hydraulic variable motor speed control system for recovering natural gas residual pressure energy according to the invention.
Fig. 2 is a structural block diagram of an open type hydraulic variable motor speed regulating system for recovering natural gas residual pressure energy according to the invention.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
The reference numerals and components referred to in the drawings are as follows:
1. expander 2. hydraulic pump
3. Check valve 4 safety valve
5. Energy accumulator 6 variable motor
7. Controller 8. generator
9. Oil cooler 10, filter
11. Oil tank 12 oil supply device
13. Flushing valve 14 natural gas pipeline
15. Energy conversion unit 16, power frequency power generation unit
Example 1
Referring to fig. 1, fig. 1 is a block diagram of a closed hydraulic variable displacement motor 6 speed control system for recovering natural gas residual pressure energy according to the present invention. A closed hydraulic variable motor 6 speed regulating system for recovering natural gas residual pressure energy comprises an expander 1, a hydraulic pump 2, an energy accumulator 5, a variable motor 6, a controller 7 and a natural gas pipeline 14; the expander 1 and the hydraulic pump 2 are connected together and are placed in a natural gas pipeline 14; the number of the natural gas pipelines 14 is at least one, and an expander 1 and a hydraulic pump 2 which are matched with each other are arranged in each natural gas pipeline 14; the hydraulic pumps 2 are connected in parallel; the output end of the hydraulic pump 2 is connected with a one-way valve 3; the output end of the one-way valve 3 is provided with a safety valve 4, an energy accumulator 5 and a variable motor 6, the safety valve 4 and the energy accumulator 5 are connected in parallel, and the energy accumulator 5 and the variable motor 6 are connected in series; the variable motor 6 is provided with a controller 7 and a generator 8; the output end of the variable motor 6 is provided with an oil cooler 9, a filter 10, an oil tank 11, an oil supplementing device 12 and a flushing valve 13; the oil cooler 9 and the filter 10 are connected in series, and the oil cooler 9 is connected with the oil tank 11; the flushing valve 13 and the oil supplementing device 12 are both connected with the oil cooler 9 in parallel, and the oil supplementing device 12 is communicated with the oil tank 11.
It should be noted that:
the natural gas residual pressure energy recovered by the expander 1, the expander 1 rotates and drives the hydraulic pump 2 to generate high-pressure oil, and the expander 1 and the hydraulic pump 2 are combined for use and fixedly placed in a natural pipeline. The natural gas pipeline 14 comprises a wellhead gas production tree pipeline and a natural gas conveying pipeline.
The expander 1 and the hydraulic pump 2 are arranged in the natural gas pipeline 14, and the number of the natural gas pipeline 14 lines is matched with the number of the natural gas pipelines, so that the recovery of residual pressure energy of the natural gas pipelines 14 is realized. The centralized energy recovery power generation is convenient to realize.
The check valve 3 only allows the liquid flow to flow in one direction in the pipeline, and high-pressure oil generated by a plurality of pumps can be output in parallel.
The natural gas pipeline 14, the expansion machine 1, the hydraulic pump 2 and the one-way valve 3 form an energy conversion unit 15, and at least one energy conversion unit 15 is arranged, so that the hydraulic pump 2 in the plurality of natural gas pipelines 14 connected in parallel can output high-pressure oil in a centralized manner. Preferably, there are two energy conversion units 15, and the two energy conversion units 15 are connected in parallel.
The safety valve 4 has the function that when the pressure of the system exceeds a set safety pressure value, oil of the system overflows a part of oil returning tank 11 through a valve port, and the abnormal system pressure caused by overlarge system or element damage due to overhigh natural gas residual pressure is prevented.
The energy accumulator 5 is an energy storage element in a hydraulic system, stores redundant pressure oil, releases a supply system when needed, supplements the flow and pressure of the system, buffers and absorbs pressure pulsation caused by sudden increase of residual pressure of natural gas, ensures that the pressure and flow of the system are in a stable range, and is convenient for the controller 7 to realize the dynamic adjustment function.
The variable motor 6 is driven to rotate by high-pressure oil, and the variable motor 6 is dynamically adjusted by the controller 7, so that the motor outputs a constant rotating speed which is not influenced by the change of natural gas residual pressure.
The generator 8 selects the magnetic pole pairs according to the constant output rotating speed of the variable motor 6, so that the variable motor 6 with the constant rotating speed drives the generator 8 to rotate to generate power frequency alternating current.
The oil cooler 9 be arranged in preventing that the system is overheated, the impurity in the filter 10 is arranged in the filtering fluid, flushometer 13 is used for heating the heat exchange, oil tank 11 is used for saving fluid, mends oily device 12 for in time supply leak and flushometer 13 heat exchange fluid, guarantee the steady operation of system.
The oil cooler 9, the filter 10, the flushing valve 13, the oil tank 11 and the oil supplementing device 12 are all hydraulic auxiliary elements, and stable operation of the system is guaranteed.
The invention forms a closed hydraulic variable motor 6 speed-regulating transmission system, and realizes the centralized recycling of residual gas pressure energy of a plurality of natural gas pipelines 14 to produce power frequency alternating current.
The working principle of the closed hydraulic variable motor 6 speed regulation transmission system is as follows:
(1) the pressure energy of the natural gas recovered by the expander 1 enables the expander 1 to rotate (the pressure energy of the natural gas is converted into mechanical energy);
(2) the expander 1 rotates to drive the hydraulic pump 2 to rotate to generate high-pressure oil (mechanical energy is converted into pressure energy of liquid);
(3) the high-pressure hydraulic oil is output through the oil pipe and is used by a subsequent hydraulic motor. Meanwhile, the hydraulic variable motor 6 adjusts the output rotating speed thereof through dynamic control, so that the generator 8 is ensured to output power frequency alternating current, and the whole process of converting natural gas pressure energy into rotary mechanical energy is completed.
Example 2
Referring to fig. 2, fig. 2 is a block diagram of another open type hydraulic variable displacement motor speed regulation system for recovering residual pressure energy of natural gas according to the present invention. The present embodiment is substantially the same as embodiment 1, except that the speed control system of the hydraulic variable displacement motor in embodiment 1 is a closed structure, while the speed control system of the hydraulic variable displacement motor in the present embodiment is an open structure, that is, the flushing valve 13 and the oil supplementing device 12 are not provided in the present embodiment, and the oil tank 11 is directly connected to the hydraulic pump 2 by using the check valve 3, thereby simplifying the structure of the whole system. Secondly, in this embodiment, the variable displacement motor 6, the controller 7 and the generator 8 form at least one power frequency power generation unit 16, so that the residual pressure of the natural gas pipelines 14 can be recovered and the power frequency alternating current can be generated in a centralized manner. Preferably, there are two power frequency power generation units 16, and the two power frequency power generation units 16 are connected in parallel.
The hydraulic variable motor 6 speed regulating system for recovering the residual pressure energy of the natural gas has high utilization rate of the residual pressure of the natural gas, and can be used for intensively recovering the residual pressure of a plurality of natural gas pipelines 14 and intensively generating power frequency alternating current; the expander 1 and the hydraulic pump 2 are arranged in the natural gas pipeline 14, and the number of the natural gas pipeline 14 lines is matched with the number of the natural gas pipelines, so that the recovery of residual pressure energy of the natural gas pipelines 14 is realized. The centralized energy recovery power generation is convenient to realize; the check valve 3 only allows liquid flow to flow in one direction in the pipeline, and high-pressure oil generated by a plurality of pumps can be output in parallel; the safety valve 4 has the function that when the pressure of the system exceeds a set safety pressure value, oil of the system overflows a part of oil return tank 11 through a valve port, and the abnormal system pressure caused by overlarge system or element damage due to overhigh natural gas residual pressure is prevented; the energy accumulator 5 is an energy storage element in the hydraulic system, stores redundant pressure oil, releases a supply system when needed, supplements the flow and pressure of the system, buffers and absorbs pressure pulsation caused by sudden increase of residual pressure of natural gas, ensures that the pressure and flow of the system are in a stable range, and is convenient for the controller 7 to realize the dynamic adjustment function; the variable motor 6 is driven to rotate by high-pressure oil, and the variable motor 6 is dynamically adjusted by the controller 7, so that the motor outputs a constant rotating speed which is not influenced by the change of natural gas residual pressure; the generator 8 selects the magnetic pole pairs according to the constant output rotating speed of the variable motor 6, so that the variable motor 6 with the constant rotating speed drives the generator 8 to rotate to generate power frequency alternating current; the oil cooler 9, the filter 10, the flushing valve 13, the oil tank 11 and the oil supplementing device 12 are all hydraulic auxiliary elements, and stable operation of the system is guaranteed.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A hydraulic variable motor speed regulating system for recovering residual pressure energy of natural gas is characterized by comprising an expander, a hydraulic pump, an energy accumulator, a variable motor, a controller and a natural gas pipeline; the expander is connected with the hydraulic pump and is placed in a natural gas pipeline; the number of the natural gas pipelines is at least one, each natural gas pipeline is internally provided with an expander and a hydraulic pump which are matched, and each hydraulic pump is connected in parallel; the output end of the hydraulic pump is connected with a one-way valve, the output end of the one-way valve is provided with a safety valve, an energy accumulator and a variable motor, the safety valve and the energy accumulator are connected in parallel, and the energy accumulator and the variable motor are connected in series;
the safety valve has the function that when the pressure of the system exceeds a set safety pressure value, oil of the system overflows a part of oil return tank through a valve port, and the abnormal system pressure caused by overlarge system or element damage due to overhigh natural gas residual pressure is prevented;
the energy accumulator is an energy storage element in the hydraulic system, stores redundant pressure oil, releases a supply system when needed, supplements the flow and pressure of the system, buffers and absorbs pressure pulsation caused by sudden increase of residual pressure of natural gas, ensures that the pressure and flow of the system are in a stable range, and is convenient for the controller to realize the dynamic adjustment function;
the variable motor is dynamically adjusted by the controller to realize that the motor outputs a constant rotating speed, and the variable motor is dynamically controlled to adjust the output rotating speed of the variable motor, so that power generation output power frequency alternating current is ensured, and the whole process of recovering natural gas pressure energy converted into rotary mechanical energy is completed;
the variable motor is provided with a controller and a generator; the output end of the variable motor is provided with an oil cooler, a filter and an oil tank; the oil cooler and the filter are connected in series, and the oil cooler is connected with the oil tank.
2. The system of claim 1, wherein the system comprises a closed hydraulic variable displacement motor speed control system or an open hydraulic variable displacement motor speed control system.
3. The hydraulic variable motor speed regulation system of claim 1, wherein the natural gas pipeline comprises a wellhead gas production tree pipeline and a natural gas transportation pipeline.
4. The hydraulic variable motor speed regulating system according to claim 2, wherein an oil supplementing device and a flushing valve are further arranged at the output end of the variable motor; the flushing valve and the oil supplementing device are connected with the oil cooler in parallel, the oil supplementing device is communicated with the oil tank, and the flushing valve is connected with the hydraulic pump.
5. The system of claim 2, wherein the oil tank is connected to the hydraulic pump via a check valve.
6. The hydraulic variable motor speed regulation system of claim 1, wherein the natural gas line, the hydraulic pump, the expander, and the check valve form an energy conversion unit.
7. The system according to claim 1, wherein the number of energy conversion units is at least one.
8. The hydraulic variable motor speed control system of claim 5, wherein the generator, the variable motor, and the controller form a power frequency power generation unit.
9. The system according to claim 8, wherein the number of power frequency power generation units is at least one.
10. The hydraulic variable motor speed regulation system of any one of claims 1 to 9, wherein the hydraulic variable motor speed regulation system is applied to the centralized recovery and centralized generation of power frequency alternating current of residual pressure of a plurality of natural gas pipelines of a shale gas "well factory".
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| CN110259633B (en) * | 2019-05-21 | 2020-11-17 | 西安交通大学 | Progressive distributed ocean current energy hydraulic transmission generator set and control method thereof |
| CN110195677B (en) * | 2019-05-21 | 2020-11-10 | 西安交通大学 | Parallel distributed ocean current energy hydraulic transmission generator set and control method thereof |
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| JPH04177140A (en) * | 1990-11-09 | 1992-06-24 | Mitsubishi Heavy Ind Ltd | Bubble diameter adjustment type underwater bubble producer |
| CN1843794A (en) * | 2006-03-31 | 2006-10-11 | 王建军 | Automobile power system using compressed air as power |
| CN102506004B (en) * | 2011-11-01 | 2013-09-25 | 浙江大学 | Compressed air type energy accumulation stable power generation device adopting liquid piston |
| GB201309902D0 (en) * | 2013-06-02 | 2013-07-17 | Bayram Peter J | A throttle controlled turbocharger to boost type 1 C Engine |
| CN103994030B (en) * | 2014-05-16 | 2016-06-15 | 江苏大学 | Integrate variable-speed constant-frequency wind power generation system and the control method of energy storage device |
| CN106065850B (en) * | 2016-06-06 | 2019-03-05 | 江苏大学 | A kind of wind energy of skyscraper roof is stable to continue electricity generation system and control method |
| CN106870289B (en) * | 2017-03-28 | 2023-08-08 | 兰州理工大学 | Hydrostatic energy storage type hydraulic drive wind generating set and control method |
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| CN203741026U (en) * | 2013-12-30 | 2014-07-30 | 北京林克富华技术开发有限公司 | Natural gas pipeline chemical dosing device |
| CN204755177U (en) * | 2015-07-24 | 2015-11-11 | 杨军 | High -pressure overflow oil and residual pressure oil power generation system at lubricated hydraulic oil station |
| CN105156156A (en) * | 2015-08-20 | 2015-12-16 | 深圳智慧能源技术有限公司 | Turbine pressure reduction power device and turbine pressure reduction unit |
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