CN216043934U - Natural gas pressure energy utilization system - Google Patents
Natural gas pressure energy utilization system Download PDFInfo
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- CN216043934U CN216043934U CN202122325294.3U CN202122325294U CN216043934U CN 216043934 U CN216043934 U CN 216043934U CN 202122325294 U CN202122325294 U CN 202122325294U CN 216043934 U CN216043934 U CN 216043934U
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Abstract
The utility model provides a natural gas pressure energy utilization system which is low in equipment cost and high in energy conversion efficiency and is suitable for utilization of natural gas pressure energy, and relates to the technical field of pressure energy utilization. The natural gas pressure energy utilization system comprises a first pressure energy conversion unit, a second pressure energy conversion unit, a hydraulic transmission device and a generator; the first pressure energy conversion unit and the second pressure energy conversion unit respectively comprise pressure conversion components; the pressure conversion assembly comprises an air inlet pipe, an air outlet pipe and at least one energy conversion device; the energy conversion device comprises a shell and a movable sealing structure, the movable sealing structure separates an inner cavity of the shell into a first medium cavity and a second medium cavity, an air inlet control valve is arranged on the air inlet pipe, an exhaust control valve is arranged on the exhaust pipe, and one end of the air inlet pipe and one end of the exhaust pipe are communicated with the second medium cavity. The system has the advantages of simple structure, low manufacturing cost, convenient maintenance and high power generation benefit.
Description
Technical Field
The utility model relates to the technical field of pressure energy utilization, in particular to a natural gas pressure energy utilization system.
Background
In the natural gas collection process, the traditional collection process flow is that the pressure of the ground bottom is directly subjected to pressure reduction and throttling, the pressure is reduced, and then the pressure enters a long-distance transmission pipeline, and the pressure of the wellhead high-pressure natural gas is required to be reduced firstly. In addition, in gathering and transporting natural gas, in order to overcome on-way resistance of a pipeline, the natural gas at the upstream of the pipeline needs to be transported at high pressure, but most of gas appliances need to operate at lower pressure, so that the high-pressure natural gas transported by the pipeline needs to be depressurized to a certain level and then supplied to the gas appliances. At present, the high-pressure natural gas is subjected to pressure reduction treatment through pressure regulating equipment, however, in the pressure regulating process, waste of the pressure energy of the natural gas is often caused.
In order to utilize the pressure energy of natural gas, the natural gas is adopted to directly push the pneumatic transmission equipment to rotate and apply work to generate electricity at present. Such as: application No.: 201820853922.0, a power generation device using natural gas pressure energy; application No.: 201921854882.2, a natural gas pressure energy utilization system. The pneumatic transmission equipment has the problems of high equipment cost and low energy conversion efficiency.
The utility model application with the application number of 201310581072.5 discloses a pneumatic hydraulic generator, which is characterized in that gas is introduced into a pressure-resistant water storage device during power generation, and water in the pressure-resistant water storage device passes through a hydraulic generator at a certain pressure by utilizing the gas, so that the hydraulic generator is pushed to rotate to generate power. The device converts the pressure energy of the gas into hydraulic energy and then generates electricity, the energy conversion efficiency of the device is high, the cost is low, and the gas can be contacted with the liquid in the pressure-resistant water storage device during working. When being used for the device natural gas well head pressure to utilize, because gas-liquid can contact, when letting in withstand voltage water storage device with high-pressure natural gas, gaseous can impact liquid, and liquid can the atomizing bubble, and during the natural gas can be sneaked into to atomizing liquid, inconvenient natural gas reuse also can sneak into the bubble in the liquid, the cavitation phenomenon also can appear at the flow in-process. Therefore, the above-described device is not suitable for use in the utilization of natural gas pressure energy.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a natural gas pressure energy utilization system which has low equipment cost and high energy conversion efficiency and is suitable for utilizing natural gas pressure energy.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the natural gas pressure energy utilization system comprises a first pressure energy conversion unit, a second pressure energy conversion unit, a hydraulic transmission device and a generator;
the first pressure energy conversion unit and the second pressure energy conversion unit respectively comprise pressure conversion components; the pressure conversion assembly comprises an air inlet pipe, an air outlet pipe and at least one energy conversion device; the energy conversion device comprises a shell and a movable sealing structure, the movable sealing structure is movably arranged in the shell and divides an inner cavity of the shell into a first medium cavity and a second medium cavity, an air inlet control valve is arranged on the air inlet pipe, an exhaust control valve is arranged on the exhaust pipe, and one end of the air inlet pipe and one end of the exhaust pipe are both communicated with the second medium cavity;
the first medium cavity of the first pressure energy conversion unit is connected with one end of the hydraulic transmission device through a pipeline, the first medium cavity of the second pressure energy conversion unit is connected with the other end of the hydraulic transmission device through a pipeline, and an output shaft of the hydraulic transmission device is in transmission connection with the generator.
Further, the hydraulic transmission device is a hydraulic motor.
Further, the movable sealing structure is a bag type structure.
Furthermore, a first flow control valve is arranged on a pipeline between the first medium cavity of the first pressure energy conversion unit and the hydraulic transmission device, and a second flow control valve is arranged on a pipeline between the first medium cavity of the second pressure energy conversion unit and the hydraulic transmission device.
The liquid supplementing system comprises a liquid supplementing pump, a first liquid supplementing pipeline, a second liquid supplementing pipeline and an oil return pipeline; one ends of the first liquid supplementing pipeline, the second liquid supplementing pipeline and the oil return pipeline are connected with a liquid outlet of the liquid supplementing pump;
the other end of the first liquid supplementing pipeline is communicated with a first medium cavity of the first pressure energy conversion unit, and a one-way valve in the direction of the first medium cavity of the first pressure energy conversion unit is arranged on the first liquid supplementing pipeline;
the other end of the second liquid supplementing pipeline is communicated with the first medium cavity of the second pressure energy conversion unit, and a one-way valve in the direction of the first medium cavity of the second pressure energy conversion unit is arranged on the second liquid supplementing pipeline;
and an overflow valve is arranged on the oil return pipeline.
Furthermore, the liquid supplementing system further comprises a cooling device, and the other end of the oil return pipeline is connected with an inlet of the cooling device.
The utility model has the beneficial effects that:
1. the natural gas pressure energy utilization system adopts the energy conversion device to convert the pressure energy of the natural gas into the kinetic energy of the liquid, and then utilizes the kinetic energy of the liquid to drive the generator to generate electricity, so that the energy conversion efficiency is high, gas and liquid are not contacted in the conversion process, and the requirement of utilizing the natural gas pressure energy is met;
2. the system adopts the energy conversion device to convert the natural gas pressure energy into the pressure energy of the hydraulic medium, the energy conversion device has simple structure and low cost, can meet the high pressure-bearing requirement, can be directly used for utilizing the pressure energy of the wellhead natural gas, and has simple structure, low manufacturing cost, convenient maintenance, high power generation benefit and convenient arrangement and installation of the energy conversion device.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic structural view of the energy conversion device of the present invention;
FIG. 4 is a schematic diagram of the utility model hydraulic transmission device generating electricity without reversing;
shown in the figure: the hydraulic control system comprises a first pressure energy conversion unit 1, a second pressure energy conversion unit 2, a hydraulic transmission device 3, a motor 4, a first flow control valve 5, a fluid infusion system 6, a high-pressure pipeline 7, a low-pressure pipeline 8, a second flow control valve 9, an energy conversion device 11, an air inlet pipe 12, an air outlet pipe 13, an air inlet control valve 14, an air outlet control valve 15, a fluid infusion pump 61, a first fluid infusion pipeline 62, a second fluid infusion pipeline 63, a return pipeline 64, a check valve 65, an overflow valve 66, a cooling device 67, a shell 111, a movable sealing structure 112, a first medium cavity 114 and a second medium cavity 113.
Detailed Description
The utility model is further illustrated with reference to the following figures and examples.
As shown in fig. 1 to 3, the natural gas pressure energy utilization system of the present invention includes a first pressure energy conversion unit 1, a second pressure energy conversion unit 2, a hydraulic power transmission device 3, and a generator 4. The first pressure energy conversion unit 1 and the second pressure energy conversion unit 2 respectively comprise pressure conversion components. The pressure conversion assembly includes an intake pipe 12, an exhaust pipe 13, and at least one energy conversion device 11. The energy conversion device 11 comprises a housing 111 and a movable sealing structure 112, the movable sealing structure 112 is movably arranged in the housing 111 and divides an inner cavity of the housing 111 into a first medium cavity 114 and a second medium cavity 113, and the sizes of the first medium cavity 114 and the second medium cavity 113 can be adjusted through the movable sealing structure 112; an air inlet control valve 14 is arranged on the air inlet pipe 12 to control the on-off of the air inlet pipe 12. An exhaust control valve 15 is provided on the exhaust pipe 113 to control the on/off of the exhaust pipe 113. One end of each of the intake pipe 12 and the exhaust pipe 13 is connected to the second medium chamber 113 of the energy conversion device 11. The first medium chamber 114 of the energy conversion device 11 of the first pressure energy conversion unit 1 is connected with one end of the hydraulic transmission device 3 through a pipeline, the first medium chamber 114 of the energy conversion device 11 of the second pressure energy conversion unit 2 is connected with the other end of the hydraulic transmission device 3 through a pipeline, and an output shaft of the hydraulic transmission device 3 is in transmission connection with the generator 4.
The hydraulic transmission device 3 is used for converting kinetic energy or pressure energy of liquid into mechanical energy, and can be a hydraulic motor, a turbine, a water turbine and the like. The hydraulic motor is more efficient, and for this reason, the hydraulic transmission device 3 in the present invention is preferably a hydraulic motor.
For convenience of automatic control, it is to be understood that solenoid valves are preferably employed for both the intake control valve 14 and the exhaust control valve 15 in the present invention.
The specific number of energy conversion devices 11 in the conversion assembly may be any number greater than or equal to 1, and in the embodiment of the present invention, the conversion assembly includes three energy conversion devices 11. For convenience of control, it is understood that when a plurality of energy conversion devices 11 are provided in the pressure energy conversion unit, it is preferable that one intake pipe and one exhaust pipe are shared among the energy conversion devices 11 in the same pressure conversion unit.
When the system is used, the air inlet pipes 12 of the first pressure energy conversion unit 1 and the second pressure energy conversion unit 2 are connected to the high-pressure pipeline 7, and the air outlet pipes 12 of the first pressure energy conversion unit 1 and the second pressure energy conversion unit 2 are connected to the low-pressure pipeline 8. For convenience of description, the intake control valve 14 on the first pressure energy converting unit 1 is defined as YM1, the exhaust control valve 15 on the first pressure energy converting unit 1 is defined as YM2, the intake control valve 14 on the second pressure energy converting unit 2 is defined as YM3, and the exhaust control valve 15 on the second pressure energy converting unit 1 is defined as YM 4.
As shown in fig. 1, when the system utilizes natural gas pressure energy, steps one, opening YM1 and YM4, and closing YM2 and YM 3. At this time, the air inlet pipe 12 of the first pressure energy conversion unit 1 and the air outlet pipe 13 of the second pressure energy conversion unit 2 are both in an on state, the air outlet pipe 13 of the first pressure energy conversion unit 1 and the air inlet pipe 12 of the second pressure energy conversion unit 2 are both in an off state, the wellhead natural gas enters the second medium cavity 113 of the first pressure energy conversion unit 1 (energy conversion device 11) along the air inlet pipe 12 of the first pressure energy conversion unit 1, the second medium cavity 113 of the first pressure energy conversion unit 1 is inflated, the movable sealing structure 112 in the energy conversion device 11 of the first pressure energy conversion unit 1 is activated under the action of the air pressure, the second medium cavity 113 is enlarged, the first medium cavity 114 is reduced, and the liquid in the first medium cavity 114 is pressed out. After being extruded out, the liquid enters the hydraulic transmission device 3 from one end of the hydraulic transmission device 3 to push the hydraulic transmission device 3 to rotate, and the hydraulic transmission device 3 drives the generator 4 to rotate through the output shaft to generate electricity. After flowing out of the hydraulic transmission device 3, the fluid enters the first medium chamber 114 of the energy conversion device 11 of the second pressure energy conversion unit 2 and presses out the gas in the second medium chamber 113 thereof, and the second pressure energy conversion unit 2 discharges low-pressure gas from the exhaust pipe 13. After the second medium chamber 113 of the energy conversion device 11 of the first pressure energy conversion unit 1 is filled with a certain amount of gas, the second step is performed, YM1 and YM4 are closed, and YM2 and YM3 are opened. At this time, the wellhead natural gas enters the second medium cavity 113 of the energy conversion device 11 of the second pressure energy conversion unit 2 along the gas inlet pipe 12 of the second pressure energy conversion unit 2, the second medium cavity 113 of the second pressure energy conversion unit 2 is inflated, the movable sealing structure 112 in the energy conversion device 11 of the second pressure energy conversion unit 2 is moved under the action of the air pressure, the second medium cavity 113 is enlarged, the first medium cavity 114 is reduced, and the liquid in the first medium cavity 114 is pressed out. After being extruded out, the liquid enters the hydraulic transmission device 3 from the other end of the hydraulic transmission device 3 to push the hydraulic transmission device 3 to reversely rotate, and then the hydraulic transmission device 3 drives the generator 4 to rotate to generate electricity. After flowing out of the hydraulic transmission device 3, the fluid enters the first medium chamber 114 of the energy conversion device 11 of the first pressure energy conversion unit 1 and presses out the gas in the second medium chamber 113 of the energy conversion device, and the first pressure energy conversion unit 1 discharges low-pressure gas from the exhaust pipe 13. After a certain amount of gas is filled in the second medium cavity 113 of the second pressure energy conversion unit 2, the step 1 is repeated, and after a certain amount of gas is filled in the second medium cavity 113 of the first pressure energy conversion unit 1, the step 2 is repeated, so that the step 1 and the step 2 are continuously circulated, the pressure energy of the natural gas can be continuously converted into electric energy, and the utilization of the pressure energy of the natural gas is realized.
In order to ensure a stable flow in the low-pressure line 8, a plurality of the above-described systems are usually arranged in parallel between the high-pressure line 7 and the low-pressure line 8.
The system adopts the energy conversion device 11 to convert the pressure energy of the natural gas into the kinetic energy of the liquid, and then utilizes the kinetic energy of the liquid to drive the generator to generate electricity, so that the energy conversion efficiency is high, and simultaneously, the gas and the liquid are not contacted in the conversion process, thereby meeting the requirement of utilizing the pressure energy of the natural gas. In a gas production wellhead, the pressure of natural gas is usually up to dozens of megapascals, the conventional pneumatic transmission equipment is difficult to meet the high pressure-bearing requirement, the energy conversion device of the system converts pneumatic force into hydraulic force by adopting the shell 111 and the movable sealing structure 112, the energy conversion device is simple in structure and low in cost, and can meet the high pressure-bearing requirement, so that the system can also be directly used for utilizing the pressure energy of the natural gas at the wellhead, and the system is low in manufacturing cost and convenient to maintain. In addition, compared with a gas-liquid energy conversion mode that the air cylinder pushes the hydraulic cylinder to be linked, the system has the advantages that the structure can be more compact, and the arrangement and installation of the energy conversion device are more convenient.
In the present invention, it is to be noted that: the first medium cavity 114 of the energy conversion device 11 of the first pressure energy conversion unit 1 is connected with one end of the hydraulic transmission device 3, and the first medium cavity 114 of the energy conversion device 11 of the second pressure energy conversion unit 2 is connected with the other end of the hydraulic transmission device 3, so that the liquid in the energy conversion devices 11 of the two pressure energy conversion units 1 is recycled, and the power generation is not limited to the mode of driving the hydraulic transmission device 3 to rotate forwards, reversely and forwards. As shown in fig. 4, a reversing structure may be provided between the first medium chamber 114 of the energy conversion device 11 of the first pressure energy conversion unit 1 and the first medium chamber 114 of the energy conversion device 11 of the second pressure energy conversion unit 2, so as to continuously push the hydraulic transmission device 3 to rotate to generate electricity (the hydraulic transmission device 3 does not reverse). In the figure, when the first pressure energy conversion unit 1 discharges liquid, the electromagnetic valves YM6 and YM7 are opened, and YM5 and YM8 are closed, and when the second pressure energy conversion unit 2 discharges liquid, YM6 and YM7 are closed, and YM5 and YM8 are opened, so that the force transmission device 3 can continuously rotate (not reverse).
The movable sealing structure 112 in the energy conversion device 11 can be specifically referred to as an existing accumulator structure, and the movable sealing structure 112 can be a piston structure or a bag structure. Since natural gas inevitably contains solid particles, especially natural gas at the wellhead is not processed and has more solid particles, if the energy conversion device 11 adopts a piston type structure, the solid particles are easy to cause piston sealing failure or piston locking in the energy conversion device 11 after entering the energy conversion device 11, so that in order to avoid the above situation, the movable sealing structure 112 is preferably of a bag type structure.
The energy conversion means 11 may be arranged in various ways, such as: horizontal, upright, inverted, inclined, etc. Especially, when the pressure of natural gas at a wellhead can be utilized, the solid particles in the gas are more, and if the solid particles in the leather bag of the energy conversion device 11 cannot be discharged in time, the contraction of the leather bag can be influenced, and the leather bag can be damaged. In order to facilitate timely discharge of solid particles in the bladder, preferably, the energy conversion device 11 is arranged in an inverted manner, that is: the second medium chamber 113 of the energy conversion means 11 faces downward and the first medium chamber 114 of the energy conversion means 11 is installed upward.
In the system, a first flow control valve 5 is provided in a pipe between the first medium chamber 114 of the energy conversion device 11 of the first pressure energy conversion unit 1 and the hydraulic transmission device 3, and a second flow control valve 9 is provided in a pipe between the first medium chamber 114 of the energy conversion device 11 of the second pressure energy conversion unit 2 and the hydraulic transmission device 3. In this way, the flow rates at which the fluid is pushed out to the hydraulic transmission device 3 by the energy conversion devices 11 of the first pressure energy conversion unit 1 and the second pressure energy conversion unit 2 can be controlled by the first flow control valve 5 and the second flow control valve 9, respectively, so that the rotational speed of the hydraulic transmission device 3 can be controlled, and the system generated voltage can be stabilized.
The first flow control valve 5 and the second flow control valve 9 can be both one-way or two-way flow control valves, and in the embodiment of the utility model, the first flow control valve 5 and the second flow control valve 9 are both one-way flow control valves which are directed to the hydraulic transmission device 3.
The system further comprises a liquid supplementing system 6, wherein the liquid supplementing system 6 comprises a liquid supplementing pump 61, a first liquid supplementing pipeline 62, a second liquid supplementing pipeline 63 and an oil return pipeline 64. And one ends of the first liquid supplementing pipeline 62, the second liquid supplementing pipeline 63 and the oil return pipeline 64 are connected with a liquid outlet of the liquid supplementing pump 61. The other end of the first fluid infusion pipeline 62 is communicated with the first medium cavity 114 of the energy conversion device 11 of the first pressure energy conversion unit 1, and the first fluid infusion pipeline 62 is provided with a check valve 65 facing the first medium cavity 114 of the energy conversion device 11 of the first pressure energy conversion unit 1. The other end of the second fluid infusion pipeline 63 is communicated with the first medium cavity 114 of the energy conversion device 11 of the second pressure energy conversion unit 2, and a check valve 65 facing the first medium cavity 114 of the energy conversion device 11 of the second pressure energy conversion unit 2 is arranged on the second fluid infusion pipeline 63. And an overflow valve 66 is arranged on the oil return pipeline 64. When the liquid in the energy conversion device 11 of the first pressure energy conversion unit 1 is not enough to completely supplement the energy conversion device 11 of the second pressure energy conversion unit 2, the fluid supplement pump 61 can supplement the liquid to the energy conversion device 11 of the second pressure energy conversion unit 2 through the second fluid supplement pipeline 63; when the liquid in the energy conversion device 11 of the second pressure energy conversion unit 2 is not enough to completely supplement the energy conversion device 11 of the first pressure energy conversion unit 1, the fluid supplement pump 61 can supplement the liquid to the energy conversion device 11 of the first pressure energy conversion unit 1 through the first fluid supplement pipeline 62, which also helps the system to generate electricity smoothly. Relief valve 66 functions as a complete valve and controls the oil make-up pressure of the system.
The fluid infusion system of the system is also provided with a cooling device 67 to cool the liquid in the oil circuit of the fluid infusion system. The other end of the return line 64 is connected to the inlet of a cooling device 67.
Claims (6)
1. Natural gas pressure can utilize system, its characterized in that: comprises a first pressure energy conversion unit (1), a second pressure energy conversion unit (2), a hydraulic transmission device (3) and a generator (4);
the first pressure energy conversion unit (1) and the second pressure energy conversion unit (2) respectively comprise pressure conversion components; the pressure conversion assembly comprises an air inlet pipe (12), an air outlet pipe (13) and at least one energy conversion device (11); the energy conversion device (11) comprises a shell (111) and a movable sealing structure (112), the movable sealing structure (112) is movably arranged in the shell (111) and divides an inner cavity of the shell (111) into a first medium cavity (114) and a second medium cavity (113), an air inlet control valve (14) is arranged on the air inlet pipe (12), an air exhaust control valve (15) is arranged on the air exhaust pipe (13), and one end of the air inlet pipe (12) and one end of the air exhaust pipe (13) are both communicated with the second medium cavity (113);
the first medium cavity (114) of the first pressure energy conversion unit (1) is connected with one end of the hydraulic transmission device (3) through a pipeline, the first medium cavity (114) of the second pressure energy conversion unit (2) is connected with the other end of the hydraulic transmission device (3) through a pipeline, and an output shaft of the hydraulic transmission device (3) is in transmission connection with the generator (4).
2. The natural gas pressure energy utilization system of claim 1, wherein: the hydraulic transmission device (3) is a hydraulic motor.
3. The natural gas pressure energy utilization system of claim 1, wherein: the movable sealing structure (112) is of a bag type structure.
4. The natural gas pressure energy utilization system of claim 1, wherein: a first flow control valve (5) is arranged on a pipeline between a first medium cavity (114) of the first pressure energy conversion unit (1) and the hydraulic transmission device (3), and a second flow control valve (9) is arranged on a pipeline between a first medium cavity (114) of the second pressure energy conversion unit (2) and the hydraulic transmission device (3).
5. The natural gas pressure energy utilization system according to any one of claims 1 to 4, wherein: the device is characterized by also comprising a liquid supplementing system (6), wherein the liquid supplementing system (6) comprises a liquid supplementing pump (61), a first liquid supplementing pipeline (62), a second liquid supplementing pipeline (63) and an oil return pipeline (64); one ends of the first liquid supplementing pipeline (62), the second liquid supplementing pipeline (63) and the oil return pipeline (64) are connected with a liquid outlet of the liquid supplementing pump (61);
the other end of the first liquid supplementing pipeline (62) is communicated with a first medium cavity (114) of the first pressure energy conversion unit (1), and a one-way valve (65) towards the first medium cavity (114) of the first pressure energy conversion unit (1) is arranged on the first liquid supplementing pipeline (62);
the other end of the second liquid supplementing pipeline (63) is communicated with the first medium cavity (114) of the second pressure energy conversion unit (2), and a one-way valve (65) towards the first medium cavity (114) of the second pressure energy conversion unit (2) is arranged on the second liquid supplementing pipeline (63);
an overflow valve (66) is arranged on the oil return pipeline (64).
6. The natural gas pressure energy utilization system of claim 5, wherein: the liquid supplementing system (6) further comprises a cooling device (67), and the other end of the oil return pipeline (64) is connected with an inlet of the cooling device (67).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122325294.3U CN216043934U (en) | 2021-09-24 | 2021-09-24 | Natural gas pressure energy utilization system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122325294.3U CN216043934U (en) | 2021-09-24 | 2021-09-24 | Natural gas pressure energy utilization system |
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| CN216043934U true CN216043934U (en) | 2022-03-15 |
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| CN202122325294.3U Active CN216043934U (en) | 2021-09-24 | 2021-09-24 | Natural gas pressure energy utilization system |
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- 2021-09-24 CN CN202122325294.3U patent/CN216043934U/en active Active
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