CN112923769A - Zero-cold-source natural gas excess pressure recycling system - Google Patents
Zero-cold-source natural gas excess pressure recycling system Download PDFInfo
- Publication number
- CN112923769A CN112923769A CN202110304316.XA CN202110304316A CN112923769A CN 112923769 A CN112923769 A CN 112923769A CN 202110304316 A CN202110304316 A CN 202110304316A CN 112923769 A CN112923769 A CN 112923769A
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- China
- Prior art keywords
- heat exchanger
- natural gas
- pipeline
- expander
- gearbox
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0014—Recuperative heat exchangers the heat being recuperated from waste air or from vapors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a cold source natural gas excess pressure recycling system, wherein an output shaft of an expander (1) is connected with a gearbox (2), a transmission shaft of the gearbox (2) is connected with rotary mechanical equipment (3), the expander (1) is connected with a heat exchanger A (4), the heat exchanger A (4) is connected with a cold storage tank (5), the cold storage tank (5) is connected with a variable frequency pump (6), the variable frequency pump 6 is connected with a heat exchanger B (9), the heat exchanger B (9) is connected with the heat exchanger A (4), the heat exchanger B (9) is connected with a system lubricating oil station (11), the heat exchanger B (9) is sequentially connected with the rotary mechanical equipment (3), the gearbox (2) and the expander (1), the gearbox (2) and the rotary mechanical equipment (3) are sequentially connected and then connected with the system lubricating oil station (11). The invention can convert the pressure energy of the natural gas into mechanical energy, can realize the recycling of the cold energy of the natural gas and simultaneously avoids the limitation of geographical positions.
Description
Technical Field
The invention belongs to the technical field of mechanical equipment, and particularly relates to a zero-cold-source natural gas residual pressure recycling system.
Background
The natural gas is a relatively clean energy, and is conveyed through a pipeline in a high-pressure mode after being mined, and is subjected to pressure regulation step by step through pressure regulation stations at different stages, and finally supplied to users for use. In the pressure regulating process of the pressure regulating station, the pressure energy of the natural gas is directly lost and wasted through the pressure regulating station. The pressure regulating station is replaced by the expansion machine, so that the pressure energy of the natural gas can drive mechanical equipment to rotate and be converted into mechanical energy, and the mechanical energy can be further converted into energy in other forms, such as electric energy, heat energy and the like. When the expander is used for replacing a pressure regulating station for pressure reduction, a lubricating oil station needs to be configured for the expander, a gear box, a mechanical rotating device and the like, a corresponding lubricating oil cooling system needs to be configured for long-time work, the lubricating oil temperature is prevented from being too high, the cooling system is separately configured, a cold source needs to be configured for the cooling system, the manufacturing cost of the system is increased, and the limitation of the geographic environment is also caused.
Disclosure of Invention
The invention aims to overcome the defects and provide a zero-cold-source natural gas residual pressure recycling system which can convert the pressure energy of natural gas into mechanical energy, can recycle the cold energy and avoids the limitation of geographical positions.
The purpose of the invention and the main technical problem of solving the invention are realized by adopting the following technical scheme:
the invention discloses a cold source natural gas residual pressure recycling and efficient utilizing system, which comprises an expander, a gearbox, rotary mechanical equipment, a heat exchanger A, a cold storage tank and a heat exchanger B, wherein: the inlet of the expander is connected with the side of a natural gas high-pressure pipe network, the output shaft of the expander is connected with a gearbox, a transmission shaft of the gearbox is connected with rotary mechanical equipment, the outlet of the expander is connected with the inlet of a heat exchanger A through a pipeline, the outlet of the heat exchanger A is connected with the side of a natural gas low-pressure pipe network through a pipeline, the other outlet of the heat exchanger A is connected with the inlet of a cold storage tank through a pipeline, the outlet of the cold storage tank is connected with the inlet of a variable-frequency pump through a pipeline, the outlet of the variable-frequency pump is connected with the inlet of a heat exchanger B through a pipeline which is sequentially provided with a check valve and a regulating valve, the outlet of the heat exchanger B is connected with the other inlet of the heat exchanger A through a pipeline which is provided with a thermodetector A, a variable-frequency pump B is, The gearbox and the rotary mechanical equipment are connected in sequence and then connected with an inlet of a system lubricating oil station through a pipeline.
Compared with the prior art, the invention has obvious beneficial effects, and the technical scheme can show that: the outlet of the expansion machine is connected with the inlet of the heat exchanger, the heat exchanger absorbs the cold energy generated by the expansion machine, and the cold energy is absorbed and then stored in the cold storage tank: the expander is connected with the rotating equipment through a gear box; the cold storage tank is connected with the heat exchanger of the expansion engine oil station through a pipeline; when the expander works, the expander drives the gear box to rotate, and the gear box drives the rotating equipment to rotate. The temperature of the low temperature natural gas after the expander can reach about 30 degrees below zero, utilize the heat exchanger to absorb this part cold energy, store in the cold storage tank, the cold storage tank passes through the heat exchanger of governing valve and system lubrication oil station and is connected, utilize the cold energy that high pressure natural gas produced behind the expander, the lubricating oil at cooling system lubrication oil station, the cold source of lubrication oil station heat exchanger is supplied with has been avoided, the direct loss of cold energy after having avoided utilizing the expander to replace the pressure regulating station has been avoided, the cold source that system lubrication oil station lubricating oil cooling needs has also been avoided, the use economy of system device has been improved, the restriction of geographical position has been avoided simultaneously.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
The labels in the figure are:
1. an expander; 2. a gearbox; 3. rotating mechanical equipment; 4. a heat exchanger A; 5. a cold storage tank; 6. a variable frequency pump A; 7. a check valve; 8. adjusting a valve; 9. a heat exchanger B; 10. a thermodetector A; 11. a system lube station; 12. a variable frequency pump B; 13. a temperature measuring instrument B; 14. a pressure sensor.
Detailed Description
The following detailed description will be made on specific embodiments, structures, features and effects of the system for recycling residual pressure of natural gas as a cooling source according to the present invention with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1, the zero-cold-source natural gas residual pressure recycling system of the present invention includes an expander 1, a transmission 2, a rotating mechanical device 3, a heat exchanger a4, a cold storage tank 5, and a heat exchanger B9, wherein: the inlet of an expander 1 is connected with the side of a natural gas high-pressure pipe network, the output shaft of the expander 1 is connected with a gearbox 2, the transmission shaft of the gearbox 2 is connected with a rotary mechanical device 3, the outlet of the expander 1 is connected with the inlet of a heat exchanger A4 through a pipeline, the outlet of a heat exchanger A4 is connected with the side of a natural gas low-pressure pipe network through a pipeline, the other outlet of the heat exchanger A4 is connected with the inlet of a cold storage tank 5, the outlet of the cold storage tank 5 is connected with the inlet of a variable-frequency pump 6 through a pipeline, the outlet of the variable-frequency pump 6 is connected with the inlet of a heat exchanger B9 through a pipeline which is sequentially provided with a check valve 7 and a regulating valve 8, the outlet of the heat exchanger B9 is connected with the other inlet of a heat exchanger A4 through a pipeline which is provided with a thermodetector A10, a variable-frequency pump B12 is arranged on, The gearbox 2, the expansion machine 1, the gearbox 2 and the rotary mechanical equipment 3 are connected in sequence and then connected with an inlet of a system lubricating oil station 11 through a pipeline.
The working principle is as follows: when the expander 1 is connected to a pipe network, the expander 1 starts to work under the action of pressure difference between the high-pressure pipe network side and the low-pressure pipe network side, the heat exchanger A4 absorbs cold energy of a natural gas medium passing through the expander 1 and stores the cold energy in the cold storage tank 5, the working pressure of the variable frequency pump 6 and the opening of the regulating valve 8 are adjusted according to the measured temperature of the thermodetector B13, the speed and the time of the cooling working medium flowing through the heat exchanger B9 are controlled, so that the temperature of high-temperature circulating lubricating oil of the system lubricating oil station 11 reaches the set temperature, meanwhile, the variable frequency pump 12, connected with the heat exchanger B9, of the system lubricating oil station 11 provides lubricating oil pressure required by normal work of the system, and therefore the purposes of converting the pressure energy of the natural gas pipe network into rotary mechanical energy by the expander 1 and recycling the cold energy at the outlet of the expander 1 by. The invention avoids the problem of cooling lubricating oil by using a water cooling mode in the prior art, and can effectively avoid the problem that the natural gas excess pressure utilization site is limited by the geographical position.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the present invention without departing from the technical spirit of the present invention.
Claims (6)
1. The utility model provides a cold source natural gas excess pressure retrieves high-efficient system of utilizing, includes expander (1), gearbox (2), rotating machinery equipment (3), heat exchanger A (4), cold storage tank (5), heat exchanger B (9), its characterized in that: the output shaft of expander (1) is connected with gearbox (2), gearbox (2) transmission shaft is connected with rotating mechanical equipment (3), the export of expander (1) is imported through pipe connection heat exchanger A (4), another export of heat exchanger A (4) is through pipeline and cold storage tank (5) access connection, the export of cold storage tank (5) is imported through pipe connection inverter pump (6), the pipeline connection heat exchanger B (9) import of inverter pump 6 export through installing check valve (7) and governing valve (8) in proper order, heat exchanger B (9) export is through pipeline and another access connection of heat exchanger A (4), another import and system's lubricating oil station (11) exit linkage of heat exchanger B (9), another export of heat exchanger B (9) is through pipeline and connects gradually rotating mechanical equipment (3), gearbox (2), expander (1), gearbox (2), The rotary mechanical equipment (3) is connected with an inlet of a system lubricating oil station (11) through a pipeline after being sequentially connected.
2. The system for recovering and efficiently utilizing the residual pressure of the natural gas of the cold source as claimed in claim 1, wherein: the other outlet of the heat exchanger B (9) is connected with a pipeline of the rotating mechanical equipment (3) and is sequentially provided with a temperature measuring instrument B (13) and a pressure sensor (14).
3. The system for recovering and efficiently utilizing the residual pressure of the natural gas of the cold source as claimed in claim 1, wherein: the outlet of the heat exchanger B (9) is connected with the other inlet of the heat exchanger A (4) through a pipeline provided with a thermodetector A (10).
4. The system for recovering and efficiently utilizing the residual pressure of the natural gas of the cold source as claimed in claim 1, wherein: a variable frequency pump B (12) is arranged on a pipeline connected between the other inlet of the heat exchanger B (9) and the outlet of the system lubricating oil station (11).
5. The system for recovering and efficiently utilizing the residual pressure of the natural gas of the cold source as claimed in claim 1, wherein: the inlet of the expander (1) is connected with the side of the natural gas high-pressure pipe network.
6. The system for recovering and efficiently utilizing the residual pressure of the natural gas of the cold source as claimed in claim 1, wherein: the outlet of the heat exchanger A (4) is connected with the natural gas low-pressure pipeline network side through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110304316.XA CN112923769A (en) | 2021-03-22 | 2021-03-22 | Zero-cold-source natural gas excess pressure recycling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110304316.XA CN112923769A (en) | 2021-03-22 | 2021-03-22 | Zero-cold-source natural gas excess pressure recycling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112923769A true CN112923769A (en) | 2021-06-08 |
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ID=76175409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110304316.XA Pending CN112923769A (en) | 2021-03-22 | 2021-03-22 | Zero-cold-source natural gas excess pressure recycling system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112923769A (en) |
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2021
- 2021-03-22 CN CN202110304316.XA patent/CN112923769A/en active Pending
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