System utilizing pressure energy of natural gas in gas storage

Abstract

The invention provides a system for utilizing pressure energy of natural gas in a gas storage, which comprises a pressure energy expansion module with a first rotor, a transmission module with an input end and an output end, and a power generation module with a second rotor, the input end is connected with the first rotor, the output end is connected with the second rotor, and the power generation module is connected with the transmission module. Natural gas from a gas storage enters the pressure energy expansion module, the first rotor rotates under the action of pressure, the first rotor drives the input end to rotate so as to drive the output end to rotate, and the output end drives the second rotor to rotate so as to enable the power generation module to generate power. The pressure energy of high-pressure natural gas in the gas storage can be converted into electric energy to be recycled for self-use in the station yard, and therefore use of external grid electricity is reduced.

Description

Technical Field

[0001] The present invention relates to the field of natural gas pressure energy power generation, and in particular to a system for utilizing the pressure energy of natural gas in a gas storage reservoir. Background Art

[0002] As my country's natural gas consumption continues to increase, the importance of natural gas reserves in balancing market supply and demand contradictions and ensuring national security has become increasingly prominent. In order to ensure the stability of downstream natural gas use, my country is rapidly advancing the construction of gas storage facilities. During the gas injection process, the gas storage facility converts electrical energy into gas injection pressure energy through a compressor and stores it underground. The high-pressure natural gas extracted from the gas storage facility is used to adjust the fluctuation of downstream gas consumption after throttling, depressurization and dehydration. If the pressure of high-pressure natural gas is recycled during the gas extraction process, the operating cost of the gas storage facility can be reduced. However, at present, the utilization of natural gas pressure energy at home and abroad is mainly concentrated in the application of natural gas pipeline pressure regulating stations, and the high-pressure natural gas pressure energy extracted from the gas storage facility has not yet been widely used. Summary of the invention

[0003] One purpose of the present invention is to propose a system that utilizes the pressure energy of natural gas in a gas storage reservoir to convert the pressure energy of high-pressure natural gas in the gas storage reservoir into electrical energy for recovery for internal use in the station, thereby reducing the use of external grid electricity.

[0004] According to the present invention, a system for utilizing the pressure energy of natural gas in a gas storage reservoir is provided, comprising: a pressure energy expansion module having a first rotor, a transmission module having an input end and an output end, and a power generation module having a second rotor, wherein the input end is connected to the first rotor, and the output end is connected to the second rotor. Natural gas from the gas storage reservoir enters the pressure energy expansion module and causes the first rotor to rotate due to pressure. The first rotor drives the input end to rotate, thereby driving the output end to rotate. The output end drives the second rotor to rotate, so that the power generation module generates electricity.

[0005] In a preferred embodiment, the system utilizing the pressure energy of natural gas in a gas storage reservoir further includes a rectifier connected to the power generation module, and the rectifier is used to convert the alternating current generated by the power generation module into direct current.

[0006] In a preferred embodiment, the system utilizing the pressure energy of natural gas in a gas storage reservoir further includes a charging controller connected to the rectifier and a battery pack connected to the charging controller, wherein the charging controller is capable of controlling the load of the power generation module charging the battery pack, and the battery pack is used to store electricity.

[0007] In a preferred embodiment, the system utilizing the pressure energy of natural gas in a gas storage reservoir further includes a pressure flow unit disposed on an external transmission pipeline connected to the pressure energy expansion module and communicatively connected to the charging controller, and is used to measure the pressure and flow of the natural gas in the external transmission pipeline. When the pressure and flow measured by the pressure flow unit exceed set values, the pressure flow unit sends a control signal to the charging controller so that part of the electricity generated by the power generation module is stored in the battery pack.

[0008] In a preferred embodiment, the system utilizing the pressure energy of natural gas in a gas storage reservoir further comprises an inverter connected to the battery pack for converting the power generation stored in the battery pack into alternating current.

[0009] In a preferred embodiment, the phase change heating furnace further includes an auxiliary heating unit, and the pressure energy expansion module, transmission module, power generation module, rectifier, charging controller, battery pack and inverter are all integrated in a device skid.

[0010] In a preferred embodiment, the input end and the output end are both gears, and the transmission ratio is 1:5.

[0011] In a preferred embodiment, the system utilizing the pressure energy of the natural gas in the gas storage is disposed close to a gas production wellhead of the gas storage.

[0012] In a preferred embodiment, the pressure energy expansion module includes an air inlet and an air outlet, the air inlet is connected to the gas wellhead of the gas storage reservoir through a pipeline, and the air outlet is connected to the external transmission pipeline.

[0013] In a preferred embodiment, the system utilizing the pressure energy of natural gas in the gas storage reservoir further comprises an air intake valve, the input end of the air intake valve is connected to the gas production wellhead, and the output end of the air intake valve is connected to the air intake.

[0014] The present invention comprises a pressure energy expansion module having a first rotor, a transmission module having an input end and an output end, and a power generation module having a second rotor. The input end is connected to the first rotor and the output end is connected to the second rotor. Natural gas enters the pressure energy expansion module and the first rotor is rotated by pressure and the first rotor drives the input end to rotate, thereby driving the output end to rotate to increase the rotation speed of the output end. The output end drives the second rotor to rotate so that the power generation module generates electricity. The pressure energy of the high-pressure natural gas in the gas storage reservoir can be converted into electrical energy for recovery for internal use of the station, thereby reducing the use of external grid electricity.

[0015] The present invention connects the input part of the intake valve to the gas wellhead of the gas storage reservoir and the output part of the intake valve to the intake port, thereby controlling the flow of natural gas in the gas storage reservoir entering the pressure energy expansion module through the intake valve, thereby adjusting the natural gas intake flow according to external electricity demand and making the entire natural gas pressure energy utilization system more stable.

[0016] The system for utilizing the pressure energy of natural gas in the gas storage reservoir of the present invention also includes a pressure flow unit arranged on the external transmission pipeline connected to the pressure energy expansion module, which is used to measure the pressure and flow of natural gas in the external transmission pipeline. The pressure flow unit is in communication connection with the charging controller. When the pressure and flow measured by the pressure flow unit exceed the set value, the pressure flow unit controls the charging controller to start, thereby storing part of the electricity generated by the power generation module in the battery pack. When the pressure and flow measured by the pressure flow unit exceed the set value, it can be indicated that the flow and pressure of the natural gas entering the pressure energy expansion module are large, and the pressure flow unit controls the charging controller to start, thereby storing part of the electricity generated by the power generation module in the battery pack, thereby improving the utilization efficiency of the electricity generated by the power generation module.

[0017] The pressure energy expansion module, transmission module, power generation module, rectifier, charging controller, battery pack and inverter described in the present invention are all integrated in a device skid, thereby minimizing the footprint of the device and facilitating installation and reuse of the device.

[0018] By making the input end and the output end both gears and the transmission ratio 1:5, the present invention can make the rotation speed of the second rotor of the power generation module about 3000 rpm and the power generation frequency about 50 Hz, thereby improving the power generation and power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The overall structure of the system for utilizing the pressure energy of natural gas in a gas storage facility according to the present invention is schematically shown.

[0020] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0021] like Figure 1As shown, the system 100 for utilizing the pressure energy of natural gas in a gas storage reservoir according to the present invention comprises: a pressure energy expansion module 1 having a first rotor 11 and an air inlet (not shown in the figure), a transmission module 2 having an input end 21 and an output end 22, and a power generation module 3 having a second rotor 31, wherein the input end 21 of the transmission module 2 is connected to the first rotor 11, the output end 22 of the transmission module 2 is connected to the second rotor 31 of the power generation module 3, the input end 21 is connected to the output end 22, the natural gas from the gas storage reservoir (not shown in the figure) enters the pressure energy expansion module 1 through the air inlet, and the first rotor 11 is rotated by the pressure, the first rotor 11 drives the input end 21 to rotate, and then drives the output end 22 to rotate, so as to increase the rotation speed of the output end 22, the output end 22 drives the second rotor 31 of the power generation module 3 to rotate by rotating, so that the power generation module 3 generates alternating current.

[0022] In the present invention, the pressure energy expansion module 1 can be a pressure energy expander. After the high-pressure natural gas enters the pressure energy expander, it can drive the first rotor 11 of the pressure energy expander to rotate through the pressure action. The first rotor 11 of the pressure energy expansion module 1 is connected to the input end 21 of the transmission module 2, so that it can drive the input end of the transmission module 2 to rotate. The input end 21 of the transmission module 2 is also connected to the output end 22, so that the input end 21 can drive the output end 22 to rotate. The transmission module 2 can be a gear box, and the input end 21 and the output end 22 can be gears that mesh with each other. The first rotor 11 of the pressure energy expansion module 1 can be a rotating shaft. The first rotor 11 is connected to the input end 21 through an axial hole, so that it can drive the input end 21 to rotate. The input end 21 and the output end 22 are meshed with each other, so that the input end 21 can drive the output end 22 to rotate. The output end 22 is connected to the second rotor 31 of the power generation module 3 through the axial hole. The power generation module 3 can be an AC generator. The output end 22 drives the second rotor 31 of the power generation module 3 to rotate by rotating, so that the power generation module 3 generates AC power.

[0023] The present invention comprises a pressure energy expansion module 1 having a first rotor 11, a transmission module 2 having an input end 21 and an output end 22, and a power generation module 3 having a second rotor 31, the input end 21 is connected to the first rotor 11 and the output end 22 is connected to the second rotor 31, natural gas enters the pressure energy expansion module, and the first rotor 31 is rotated by pressure, and the first rotor 31 drives the input end 21 to rotate, thereby driving the output end 22 to rotate, so as to increase the rotation speed of the output end 22, and the output end 22 drives the second rotor 31 to rotate, so that the power generation module 3 generates electricity, and the pressure energy of the high-pressure natural gas in the gas storage reservoir can be converted into electrical energy for recovery for internal use of the station, thereby reducing the use of external grid electricity.

[0024] In one or more embodiments, the system 100 for utilizing the pressure energy of natural gas in a gas storage reservoir of the present invention further includes an intake valve 4, the input of the intake valve 4 is connected to the gas wellhead of the gas storage reservoir, and the output of the intake valve 4 is connected to the intake port.

[0025] The present invention connects the input part of the air intake valve 4 to the gas wellhead of the gas storage reservoir and the output part of the air intake valve 4 to the air inlet, thereby controlling the flow of natural gas in the gas storage reservoir entering the pressure energy expansion module 1 through the air intake valve 4, thereby adjusting the natural gas intake flow according to external electricity demand and making the entire natural gas pressure energy utilization system more stable.

[0026] In one or more embodiments, the system 100 for utilizing the pressure energy of natural gas in a gas storage reservoir according to the present invention further includes a rectifier 5 connected to the power generation module 3, and the rectifier 5 is used to convert the alternating current generated by the power generation module 3 into direct current. The power generation module 3 is used to generate alternating current, and the present invention includes a rectifier 5 connected to the power generation module 3, so that the alternating current can be converted into direct current through the rectifier 5 for storage.

[0027] In the process of extracting natural gas from the gas storage, the amount of natural gas extracted and the pressure of natural gas will gradually decrease, resulting in a decrease in the power generation of the power generation module 3, and the power generation cannot be matched with the power demand in the station. In one or more embodiments, the system 100 for utilizing the pressure energy of natural gas in the gas storage according to the present invention also includes a charging controller 6 connected to the rectifier 5 and a battery pack 7 connected to the charging controller 6. The rectifier 5 can convert AC power into DC power. The charging controller 6 is connected to the rectifier 5 and the charging controller 6 is connected to the battery pack 7. The charging controller 6 can control the load of the power generation module 3 charging the battery pack 7, so that the power generated by the power generation module 3 is converted into DC power by the rectifier 5 and then charged into the battery pack 7. The battery pack 7 is used to store the power generation of the power generation module 3. Since the gas production wells in the gas storage are affected by the downstream gas consumption and fluctuate, the power generation of the power generation module 3 also fluctuates. The present invention stores the power generation through the battery pack 7, which helps to improve the imbalance of the power generated by the power generation module 3 and achieve the stability of external power supply.

[0028] In one or more embodiments, the charging controller 6 can also control the excitation of the power generation module 3 by controlling the charging load, thereby changing the rotation speed of the second rotor 31 of the power generation module 3, thereby changing the rotation speed of the first rotor 11 of the pressure energy expansion module 1, thereby being able to control the amount of natural gas extracted from the gas storage.

[0029] In one or more embodiments, the system 100 for utilizing the pressure energy of natural gas in a gas storage reservoir of the present invention further includes an inverter 8 connected to the battery pack 7, and the inverter 8 is used to convert the power generation stored in the battery pack 7 into alternating current for external use.

[0030] In one or more embodiments, the input end 21 and the output end 22 are gears, and the transmission ratio is 1:5. The rotation speed of the first rotor 11 of the pressure energy expansion module 1 is 500-600 rpm. By making the input end 21 and the output end 22 both gears, and the transmission ratio is 1:5, the rotation speed of the second rotor of the power generation module 3 can be about 3000 rpm, and the power generation frequency can be about 50 Hz, thereby improving the power generation and power generation efficiency.

[0031] In one or more embodiments, the pressure energy expansion module 1, transmission module 2, power generation module 3, rectifier 5, charging controller 6, battery pack 7 and inverter 8 described in the present invention are all integrated in a device skid, thereby minimizing the footprint of the device and facilitating the installation and reuse of the device.

[0032] In one or more embodiments, the system 100 for utilizing the pressure energy of natural gas in a gas storage reservoir described in the present invention can be arranged near the gas production wellhead of the gas storage reservoir, and the gas production pipeline is connected to the gas inlet of the pressure energy expansion module 1. The pressure energy expansion module 1 also includes a gas outlet (not shown in the figure). The natural gas expanded in the pressure energy expansion module 1 is connected to the external transmission pipeline through the gas outlet, and the power supply line connected to the inverter 8 is connected to the power grid inside the gas storage reservoir to supply power to various power facilities inside the gas storage reservoir.

[0033] In one or more embodiments, the system 100 for utilizing the pressure energy of natural gas in a gas storage reservoir of the present invention further includes a pressure flow unit 9 disposed on an external transmission pipeline connected to the pressure energy expansion module 1, which is used to measure the pressure and flow of natural gas in the external transmission pipeline. The pressure flow unit 9 is in communication with the charging controller 6. When the pressure and flow measured by the pressure flow unit 9 exceed the set value, the pressure flow unit 9 sends a control signal to the charging controller 6 so that the electricity generated by the power generation module 3 can be charged into the battery pack 7. When the pressure and flow measured by the pressure flow unit 9 exceed the set value, it can be indicated that the flow and pressure of the natural gas entering the pressure energy expansion module 1 are large, and the pressure flow unit 9 controls the charging controller 6 to start, thereby storing part of the electricity generated by the power generation module 3 in the battery pack 7, thereby improving the utilization efficiency of the electricity generated by the power generation module 3.

[0034] The following briefly introduces the working conditions and principles of the system 100 for utilizing the pressure energy of natural gas in a gas storage reservoir according to the present invention:

[0035] The natural gas from the gas storage enters the pressure energy expansion module 1 through the air inlet, and the first rotor 11 is rotated by the pressure. The first rotor 11 drives the input end 21 to rotate, and then drives the output end 22 to rotate, so as to increase the rotation speed of the output end 22. The output end 22 drives the second rotor 31 of the power generation module 3 to rotate by rotating, so that the power generation module 3 generates alternating current, so that the pressure energy of the high-pressure natural gas in the gas storage can be converted into electrical energy for recovery for internal use of the station, thereby reducing the use of external grid electricity.

[0036] The rectifier 5 connected to the power generation module 3 can convert the alternating current generated by the power generation module 3 into direct current, so that the power generated by the power generation module 3 can be easily stored. The charging controller 6 connected to the rectifier 5 can control the load of the power generation module 3 charging the battery pack 7. The battery pack 7 is used to store the power generation of the power generation module 3. When the pressure and flow rate of the natural gas in the external transmission pipeline measured by the pressure flow unit 9 in the external transmission pipeline exceeds the set value, the pressure flow unit 9 sends a control signal to the charging controller 6 so that the power generated by the power generation module 3 can be charged into the battery pack 7, so that part of the power generated by the power generation module 3 is stored in the battery pack 7, and the remaining power generated by the power generation module 3 can be directly used to power external electrical equipment. The power stored in the battery pack 7 can be powered externally through the inverter 8, so that when the pressure and flow rate of the natural gas in the gas storage are large, part of the power generated by the power generation module 3 can be stored for use when the pressure and flow rate of the natural gas in the gas storage are small, resulting in insufficient power generated by the power generation module 3, which helps to improve the imbalance of the power generated by the power generation module 3 and achieve stability in external power supply.

[0037] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A system for utilizing the pressure energy of natural gas in a gas storage reservoir, comprising: A pressure energy expansion module having a first rotor, a transmission module having an input end and an output end, and a power generation module having a second rotor, wherein the input end is connected to the first rotor, and the output end is connected to the second rotor, Natural gas from the gas storage enters the pressure energy expansion module and causes the first rotor to rotate through the action of pressure. The first rotor drives the input end to rotate, thereby driving the output end to rotate. The output end drives the second rotor to rotate, so that the power generation module generates electricity.

2. The system for utilizing the pressure energy of natural gas in a gas storage reservoir according to claim 1, characterized in that: The system utilizing the pressure energy of natural gas in the gas storage also includes a rectifier connected to the power generation module, and the rectifier is used to convert the alternating current generated by the power generation module into direct current.

3. The system for utilizing the pressure energy of natural gas in a gas storage reservoir according to claim 2, characterized in that: The system utilizing the pressure energy of natural gas in a gas storage reservoir also includes a charging controller connected to the rectifier and a battery pack connected to the charging controller, wherein the charging controller can control the load of the power generation module charging the battery pack, and the battery pack is used to store electricity.

4. The system for utilizing the pressure energy of natural gas in a gas storage reservoir according to claim 3, characterized in that: The system utilizing the pressure energy of natural gas in the gas storage reservoir also includes a pressure flow unit arranged on an external transmission pipeline connected to the pressure energy expansion module and in communication with the charging controller, which is used to measure the pressure and flow of the natural gas in the external transmission pipeline. When the pressure and flow measured by the pressure flow unit exceed the set value, the pressure flow unit sends a control signal to the charging controller so that the electricity generated by the power generation module can be charged into the battery pack.

5. The system for utilizing the pressure energy of natural gas in a gas storage according to claim 4, characterized in that: The system utilizing the pressure energy of natural gas in a gas storage facility further includes an inverter connected to the battery pack for converting the power generation stored in the battery pack into alternating current.

6. The system for utilizing the pressure energy of natural gas in a gas storage according to claim 5, characterized in that: The pressure energy expansion module, transmission module, power generation module, rectifier, charging controller, battery pack and inverter are all integrated in a device skid.

7. The system for utilizing the pressure energy of natural gas in a gas storage facility according to claim 1, characterized in that: The input end and the output end are both gears, and the transmission ratio is 1:

5.

8. The system for utilizing the pressure energy of natural gas in a gas storage facility according to claim 5, characterized in that: The system utilizing the pressure energy of the natural gas in the gas storage reservoir is arranged near the gas production wellhead of the gas storage reservoir.

9. The system for utilizing the pressure energy of natural gas in a gas storage according to claim 8, characterized in that: The pressure energy expansion module comprises an air inlet and an air outlet, wherein the air inlet is connected to a gas production wellhead of a gas storage reservoir through a pipeline, and the air outlet is connected to the external transmission pipeline.

10. The system for utilizing the pressure energy of natural gas in a gas storage facility according to claim 9, characterized in that: The system utilizing the pressure energy of natural gas in the gas storage reservoir further comprises an air intake valve, the input end of the air intake valve is connected to the gas production wellhead, and the output end of the air intake valve is connected to the air intake.

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