CN219754610U - Natural gas residual pressure recovery system - Google Patents
Natural gas residual pressure recovery system Download PDFInfo
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- CN219754610U CN219754610U CN202321434434.3U CN202321434434U CN219754610U CN 219754610 U CN219754610 U CN 219754610U CN 202321434434 U CN202321434434 U CN 202321434434U CN 219754610 U CN219754610 U CN 219754610U
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- natural gas
- expander
- heat exchanger
- recovery system
- compressor
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 214
- 239000003345 natural gas Substances 0.000 title claims abstract description 107
- 238000011084 recovery Methods 0.000 title claims abstract description 39
- 238000003303 reheating Methods 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000005380 natural gas recovery Methods 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a natural gas residual pressure recovery system, and relates to the technical field of natural gas conveying and residual pressure recovery. The high-pressure natural gas enters a first expander, the exhaust gas after expansion work of the first expander enters the cold side of a first heat exchanger through a cold energy utilization device, flows out of the cold side of the first heat exchanger and enters an inlet of a second expander, and the exhaust gas of the second expander is merged into a low-pressure side natural gas pipe network; the system also comprises a reheating cycle, wherein the circulating working medium of the reheating cycle is a medium-high temperature heat pump working medium; the reheating cycle comprises a throttle valve, a second heat exchanger and a compressor; the circulating working medium enters the hot side of the first heat exchanger after being compressed by the compressor, then enters the cold side of the second heat exchanger through the throttle valve and returns to the inlet of the compressor. The natural gas residual pressure recovery system solves the technical problems that the high-pressure-drop natural gas recovery system in the prior art needs multistage pressure regulation and intermediate conversion pressure regulation, and the utilization efficiency of natural gas pressure energy is low.
Description
Technical Field
The utility model relates to the technical field of natural gas transportation and residual pressure recovery, in particular to a natural gas residual pressure recovery system.
Background
After the natural gas is combusted, water and carbon dioxide are mainly generated, so that the natural gas is environment-friendly and is a clean energy source. The natural gas is transported by pipeline under high pressure, and is supplied downstream after pressure regulation to a natural gas valve station. The degree of depressurization required is also different for different natural gas use consumers. The natural valve station for large users is designed to have relatively large pressure drop, and the pressure is generally reduced from about 6.3Mpa to about 0.1-0.3Mpa required by the users. The gas consumption of a natural valve station of a large user is also particularly large, and can reach hundreds of thousands of cubic meters per day. In the process of regulating the pressure of the natural gas, as the pressure drop is accompanied by temperature drop, if the temperature of the high-pressure natural gas is about 0 ℃, the temperature can be reduced to-40 ℃ after the accompanied pressure drops to about 0.1-0.3 MPa. The pressure energy lost by the large amount of high pressure drop natural gas can be particularly great. The existing natural gas residual pressure recovery device utilizes natural gas pressure drop to drive an expander to generate power.
In the process of realizing the scheme, the inventor finds that at least the following problems exist in the prior art:
the existing expander is difficult to directly reduce the pressure of natural gas to the pressure required by a natural valve shop, and is required to perform intermediate conversion pressure regulation. This is because the high expansion ratio of the high pressure drop natural gas requires an expander, and even if the high efficiency turbo expander is used for recovery, the high expansion ratio also puts a considerable demand on the performance of the turbo expander in every aspect, and the higher the expansion ratio, the lower the temperature after expansion, and also has a certain influence on other equipment of the door station.
Based on the above, it is needed to provide a natural gas recovery system with a large pressure drop, and to efficiently and deeply recover the pressure energy of the natural gas.
Disclosure of Invention
The utility model aims to provide a utilization device capable of efficiently and deeply recycling natural gas pressure energy, and solves the technical problems that a large-pressure-drop natural gas recycling system in the prior art needs multistage pressure regulation and intermediate conversion pressure regulation, and the utilization efficiency of the natural gas pressure energy is low.
To achieve the purpose, the utility model adopts the following technical scheme:
the natural gas residual pressure recovery system comprises a first expander, wherein the high-pressure natural gas enters a cold side of a first heat exchanger through a cold utilization device after being expanded by the first expander, flows out of the cold side of the first heat exchanger and enters an inlet of a second expander, and is merged into a low-pressure side natural gas pipeline network through the exhaust gas of the second expander; the first expander and the second expander are connected with a generator; the system also comprises a reheating cycle, wherein a circulating working medium of the reheating cycle is a medium-high temperature heat pump working medium; the reheating cycle comprises a throttle valve, a second heat exchanger and a compressor; the working medium enters the hot side of the first heat exchanger after being compressed by the compressor, then enters the cold side of the second heat exchanger through the throttle valve and returns to the inlet of the compressor; the compressor is powered by a power supply system.
Further, the system further comprises a gear box, wherein an output shaft of the first expander is connected with a first input end of the gear box, an output shaft of the second expander is connected with a second input end of the gear box, and an output end of the gear box is connected with the generator.
Further, the power supply system comprises a wind generating set, a controller and a storage battery; the wind generating set is connected with the controller, the controller is connected with the storage battery, and the storage battery supplies power for the compressor.
Further, the power supply system comprises a solar generator set, a controller and a storage battery; the solar generator set is connected with the controller, the controller is connected with the storage battery, and the storage battery supplies power for the compressor.
Further, the controller includes an inverter.
Further, a temperature monitor is arranged on a pipeline between the outlet of the cold side of the first heat exchanger and the inlet of the second expander.
Further, an insulation layer is installed on a pipeline between the outlet of the compressor and the inlet of the hot side of the first heat exchanger.
Further, the second heat exchanger is an air temperature type heat exchanger.
Further, a pressure regulating valve is arranged at the inlet of the first expander.
Further, the medium-temperature heat pump working medium is one or more of R22, R134a and R410 a.
The beneficial effects are that:
the natural gas residual pressure recovery system comprises a residual pressure recovery flow path and a reheat cycle. The residual pressure recovery flow path is as follows: the high-pressure natural gas at the tail end of the long-distance pipeline enters the first expander after entering the system, the temperature of the natural gas of the exhaust gas after being expanded and decompressed by the first expander is also reduced, at the moment, the natural gas of the exhaust gas after being expanded and acting by the first expander enters the cold energy utilization device, and the cold energy utilization device utilizes the cold energy after the natural gas is decompressed to refrigerate. Natural gas exiting the cold energy utilization device reenters the cold side of the first heat exchanger, and heat on the hot side of the first heat exchanger is provided by a reheat cycle. After the temperature of the natural gas is raised by the first heat exchanger, the natural gas flowing out from the outlet of the cold side of the first heat exchanger rises, then enters the second expander to expand and do work, the exhaust pressure of the second expander is reduced to the natural gas pressure standard of the door station, and the natural gas can be directly connected to the natural gas pipe network of the downstream low-pressure side.
The cycle working medium of the reheating cycle is a medium-high temperature heat pump working medium; the working temperature area of the reheating cycle is moved upwards by the medium-high temperature heat pump working medium, so that the recovery range of low-level heat energy resources is enlarged. The reheat cycle includes a throttle valve, a second heat exchanger, and a compressor. The circulating working medium is compressed by a compressor and then heated, enters a hot side pipeline of the first heat exchanger, exchanges heat with low-temperature natural gas on the cold side of the first heat exchanger, and improves the temperature of the natural gas on the cold side. The temperature of the circulating working medium flowing out of the hot side pipeline of the first heat exchanger is reduced, the circulating working medium enters the throttle valve again, the temperature of the working medium after throttling can be further reduced, the low-temperature circulating working medium then enters the cold side of the second heat exchanger, after the temperature of the circulating working medium rises through the temperature rise of the hot side of the second heat exchanger, the rising circulating working medium returns to the inlet of the compressor, and the next circulation is started. The temperature of the circulating working medium entering the hot side of the first heat exchanger is further improved, and the temperature of the natural gas entering the second expander is further improved.
According to the scheme, the natural gas residual pressure recovery system is provided with a reheating cycle, and the reheating cycle can improve the temperature of natural gas entering the second expander, so that the pressure of the natural gas entering the low-pressure side of the natural gas pipe network is reduced. Therefore, the natural gas residual pressure recovery system of the scheme can realize the large pressure drop of natural gas through the two expansion machines, namely, the natural gas in the high-pressure transportation pipeline is reduced to the pressure required by a store, meanwhile, the pressure drop of the natural gas is utilized to generate electric energy, the cold energy in the natural gas pressure drop process is recovered through the cold energy utilization device, the natural gas pressure energy is deeply recovered, and the efficiency and the economic benefit of the natural gas residual pressure recovery system are improved.
Drawings
FIG. 1 is a schematic diagram of the natural gas residual pressure recovery system of the present utility model.
In the figure: 1-a pressure regulating valve; 2-a first expander; 3-a cold energy utilization device; 4-a first heat exchanger; 5-a temperature monitor; 6-a second expander; 7-a gear box; an 8-generator; 9-a wind generating set; 10-a solar generator set; 11-a controller; 12-a storage battery; 13-a compressor; 14-a throttle valve; 15-a second heat exchanger.
Detailed Description
In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Embodiment one:
the embodiment provides a natural gas residual pressure recovery system, wherein high-pressure natural gas firstly enters a first expander 2, exhaust gas after expansion work of the first expander 2 enters the cold side of a first heat exchanger 4 through a cold energy utilization device 3, flows out of the cold side of the first heat exchanger 4 and enters an inlet of a second expander 6, and is merged into a low-pressure side natural gas pipe network through the exhaust gas of the second expander 6; the first expander 2 and the second expander 6 are connected with a generator 8; the system also comprises a reheating cycle, wherein the circulating working medium of the reheating cycle is a medium-high temperature heat pump working medium; the reheat cycle comprises a throttle valve 14, a second heat exchanger 15, and a compressor 13; the working medium enters the hot side of the first heat exchanger 4 after being compressed by the compressor 13, then enters the cold side of the second heat exchanger 15 through the throttle valve 14 and returns to the inlet of the compressor 13; the compressor 13 is powered by a power supply system.
The natural gas residual pressure recovery system of the present embodiment includes a residual pressure recovery flow path and a reheat cycle. The residual pressure recovery flow path is as follows: the high-pressure natural gas at the tail end of the long-distance pipeline enters the first expander 2 after entering the system, the temperature of the exhaust natural gas after being expanded and decompressed by the first expander 2 is also reduced, at the moment, the exhaust gas after being expanded and acted by the first expander 2 enters the cold energy utilization device 3, and the cold energy utilization device 3 utilizes the cold energy after the natural gas is decompressed to refrigerate. The natural gas coming out of the cold energy utilization device 3 re-enters the cold side of the first heat exchanger 4, and the heat of the hot side of the first heat exchanger 4 is provided by the reheating cycle. After the temperature of the natural gas is raised by the first heat exchanger 4, the natural gas flows out from the outlet of the cold side of the first heat exchanger 4, then enters the second expander 6 to expand and do work, the exhaust pressure of the second expander 6 is reduced to the natural gas pressure standard of the door station, and the natural gas is introduced into the natural gas pipe network at the downstream low-pressure side, and the temperature of the expanded natural gas is within a safe range.
The cycle working medium of the reheating cycle is a medium-high temperature heat pump working medium; the working temperature area of the reheating cycle is moved upwards by the medium-high temperature heat pump working medium, so that the recovery range of low-level heat energy resources is enlarged. The reheat cycle comprises a throttle valve 14, a second heat exchanger 15, a compressor 13. The working medium is compressed by the compressor 13 and then heated, enters a hot side pipeline of the first heat exchanger 4, exchanges heat with low-temperature natural gas on the cold side of the first heat exchanger 4, and improves the temperature of the natural gas on the cold side. At the same time, the temperature of the working medium flowing out of the hot side of the first heat exchanger 4 is reduced, and then the working medium enters the throttle valve 14, the temperature of the throttled working medium is further reduced, the circulating working medium with reduced temperature then enters the cold side of the second heat exchanger 15, and the circulating working medium is returned to the inlet end of the compressor 13 after absorbing low-level heat of the environment under the action of the second heat exchanger 15, so that the next circulation is started. The temperature of the circulating working medium entering the hot side of the first heat exchanger 4 is further increased by increasing the temperature of the inlet of the compressor 13 through the temperature reduction of the throttle valve 14 and the temperature of the circulating working medium entering the second heat exchanger 15, and then the temperature of the natural gas entering the second expander 6 is increased.
According to the scheme, the natural gas residual pressure recovery system is provided with a reheating cycle, and the reheating cycle can improve the temperature of natural gas entering the second expander, so that the pressure of the natural gas entering the low-pressure side of the natural gas pipe network is reduced. Therefore, the natural gas residual pressure recovery system of the scheme can realize the large pressure drop of natural gas through the two expansion machines, namely, the natural gas in the high-pressure transportation pipeline is reduced to the pressure required by a store, meanwhile, the pressure drop of the natural gas is utilized to generate electric energy, the cold energy in the natural gas pressure drop process is recovered through the cold energy utilization device, the natural gas pressure energy is deeply recovered, and the efficiency and the economic benefit of the natural gas residual pressure recovery system are improved.
It should be noted that, the first heat exchanger and the second heat exchanger may both use heat exchangers in the prior art, and those skilled in the art know that the heat exchangers include at least one hot fluid and at least one cold fluid, where the hot fluid and the cold fluid exchange heat in the heat exchangers, the pipeline where the hot fluid is located is a hot side of the heat exchangers, and the pipeline where the cold fluid is located is a cold side of the heat exchangers.
Further, the hot side fluid of the second heat exchanger 15 uses air, such as exhaust gas with low heat, and further, the second heat exchanger 15 in the reheat cycle is an air temperature heat exchanger.
Further, the medium-temperature heat pump working medium is one or more of R22, R134a and R410 a. Preferably, the medium-temperature high-temperature heat pump working medium adopts a heat pump working medium with a boiling point below 40 ℃ and a critical temperature above 70 ℃. Preferably, R410a with a boiling point below 40 ℃ and a critical temperature above 70 ℃ is used, and has the advantages of being stable, nonflammable and nontoxic. In addition, by adopting the circulating working medium, even at about 15 ℃ below zero, more heat exchange quantity of the air temperature type reheater can be ensured from the absorption of air. The medium-high temperature heat pump working medium with the critical temperature of more than 70 ℃ can realize the reheating requirement of the low-temperature natural gas after passing through the first expander 2.
Further, the cold energy utilization device 3 is an ice maker to make ice using natural gas cold energy.
Further, the power generation device further comprises a gear box 7, an output shaft of the first expander 2 is connected with a first input end of the gear box 7, an output shaft of the second expander 6 is connected with a second input end of the gear box 7, and an output end of the gear box 7 is connected with a power generator 8. The gearbox 7 can be used to connect the output shafts of the first expander 2 and the second expander 6 to a generator and can also be used to regulate the rotational speed and torque of the first expander 2 and the second expander 6.
Further, the power supply system comprises a wind generating set 9, a controller 11 and a storage battery 12; the wind generating set 9 is connected with a controller 11, the controller 11 is connected with a storage battery 12, and the storage battery 12 supplies power for a compressor 13. Further, the controller includes an inverter.
Further, the power supply system comprises a solar generator set 10, a controller 11 and a storage battery 12; the solar generator set 10 is connected with a controller 11, the controller 11 is connected with a storage battery 12, and the storage battery 12 supplies power for a compressor 13. Further, the controller includes an inverter.
Further, the power supply system comprises a wind generating set 9, a solar generating set 10, a controller 11 comprises an inverter, the inverter comprises at least two input ends and at least one output end, the wind generating set 9 and the solar generating set 10 are respectively connected to the two input ends of the inverter, the output end of the inverter is connected with a storage battery 12, and the storage battery 12 supplies power for a compressor 13.
Further, a temperature monitor 5 is arranged on a pipeline between the cold side outlet of the first heat exchanger 4 and the inlet of the second expander 6, and is used for detecting the temperature of the inlet of the second expander, especially avoiding damage to equipment caused by too low temperature, and also is used for detecting the operation temperature of the whole natural gas residual pressure recovery system.
Further, a pressure regulating valve 1 is arranged at the inlet of the first expander 2 for regulating the pressure of the natural gas entering the first expander 2. In addition, the pressure regulating valve 1 is combined with the temperature monitor 5, so that the natural gas residual pressure recovery system can be adjusted to work in an optimal state.
Further, an insulation layer is installed on a pipeline between the outlet of the compressor 13 and the hot side inlet of the first heat exchanger 4 in the reheating cycle, so as to reduce heat loss of the high-temperature working medium at the outlet side of the compressor.
Embodiment two:
the embodiment provides a natural gas pressure regulating equipment, including the natural gas residual pressure recovery system of embodiment one, the natural gas pressure regulating equipment of this embodiment just can realize the big pressure drop of natural gas through two expanders to produce the electric energy in the in-process that natural gas step down, in addition, still retrieved the cold energy in the natural gas pressure drop in-process through cold energy utilization device, improved the economic benefits of natural gas pressure regulating equipment.
It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.
Claims (10)
1. The natural gas residual pressure recovery system is characterized in that high-pressure natural gas firstly enters a first expander, exhaust gas after expansion work of the first expander enters the cold side of a first heat exchanger through a cold energy utilization device, flows out of the cold side of the first heat exchanger and enters an inlet of a second expander, and the exhaust gas of the second expander is merged into a low-pressure side natural gas pipe network; the first expander and the second expander are connected with a generator;
the system also comprises a reheating cycle, wherein a circulating working medium of the reheating cycle is a medium-high temperature heat pump working medium;
the reheating cycle comprises a throttle valve, a second heat exchanger and a compressor; the working medium enters the hot side of the first heat exchanger after being compressed by the compressor, then enters the cold side of the second heat exchanger through the throttle valve and returns to the inlet of the compressor; the compressor is powered by a power supply system.
2. The natural gas residual pressure recovery system according to claim 1, further comprising a gearbox, wherein an output shaft of the first expander is connected to a first input of the gearbox, an output shaft of the second expander is connected to a second input of the gearbox, and an output of the gearbox is connected to the generator.
3. The natural gas residual pressure recovery system according to claim 1, wherein the power supply system comprises a wind generating set, a controller and a storage battery; the wind generating set is connected with the controller, the controller is connected with the storage battery, and the storage battery supplies power for the compressor.
4. The natural gas residual pressure recovery system according to claim 1, wherein the power supply system comprises a solar power generator set, a controller and a storage battery; the solar generator set is connected with the controller, the controller is connected with the storage battery, and the storage battery supplies power for the compressor.
5. A natural gas residual pressure recovery system according to claim 3 or 4, wherein the controller comprises an inverter.
6. A natural gas residual pressure recovery system according to claim 1, characterized in that a temperature monitor is provided on the line between the outlet of the cold side of the first heat exchanger and the inlet of the second expander.
7. A natural gas residual pressure recovery system according to claim 1, wherein a heat insulating layer is provided on the line between the outlet of the compressor and the inlet of the hot side of the first heat exchanger.
8. The natural gas residual pressure recovery system of claim 1, wherein the second heat exchanger is an air temperature heat exchanger.
9. The natural gas residual pressure recovery system according to claim 1, wherein a pressure regulating valve is provided at an inlet of the first expander.
10. The natural gas residual pressure recovery system according to claim 1, wherein the medium-temperature heat pump working medium is one of R22, R134a, R410 a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321434434.3U CN219754610U (en) | 2023-06-07 | 2023-06-07 | Natural gas residual pressure recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321434434.3U CN219754610U (en) | 2023-06-07 | 2023-06-07 | Natural gas residual pressure recovery system |
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| CN219754610U true CN219754610U (en) | 2023-09-26 |
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| CN202321434434.3U Active CN219754610U (en) | 2023-06-07 | 2023-06-07 | Natural gas residual pressure recovery system |
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| CN (1) | CN219754610U (en) |
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2023
- 2023-06-07 CN CN202321434434.3U patent/CN219754610U/en active Active
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