CN216922245U - High-efficient recovery unit of pipeline natural gas pressure energy and chemical energy - Google Patents
High-efficient recovery unit of pipeline natural gas pressure energy and chemical energy Download PDFInfo
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- CN216922245U CN216922245U CN202122442281.4U CN202122442281U CN216922245U CN 216922245 U CN216922245 U CN 216922245U CN 202122442281 U CN202122442281 U CN 202122442281U CN 216922245 U CN216922245 U CN 216922245U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The utility model belongs to the technical field of natural gas, and discloses a device for efficiently recovering pressure energy and chemical energy of pipeline natural gas, which comprises: the natural gas pipeline and the pressure difference power generation device generate power by utilizing the natural gas pressure difference; the first heat exchanger is used for exchanging heat with the low-temperature natural gas generated by the differential pressure generating device; a natural gas fuel cell; generating power by using the chemical energy of the depressurized natural gas; the second heat exchanger is used for exchanging heat between the low-temperature natural gas and the hot tail gas; the natural gas pipeline is communicated with the natural gas fuel cell and downstream natural gas respectively after passing through the second heat exchanger; the control system is used for controlling the flow and cut-off of natural gas in the natural gas pipeline; a gas-liquid separation device; a water storage tank and a carbon dioxide recovery device. The device disclosed by the utility model is combined with a natural gas fuel cell in a gas field station through a differential pressure power generation technology, so that the natural gas is efficiently utilized, and meanwhile, the energy conservation and the environmental protection are realized.
Description
Technical Field
The utility model relates to the technical field of natural gas, in particular to a device for efficiently recovering pressure energy and chemical energy of pipeline natural gas.
Background
The description of the background of the utility model pertaining to the related art to which this invention pertains is given for the purpose of illustration and understanding only of the present invention, and is not to be construed as an admission that the applicant is explicitly or implicitly admitted to be prior art to the date of filing this application for the first time.
The carbon emission can be effectively reduced by applying advanced processes, technologies and equipment to efficiently utilize natural gas in the gas field station, and the aim of carbon neutralization is fulfilled.
When natural gas enters a low-pressure pipe network from a high-pressure pipe network, pressure regulation is needed to reduce the pressure of the natural gas. At present, throttling is the most common pressure regulating process in an urban gas pipe network, but a large amount of pressure energy is wasted.
SUMMERY OF THE UTILITY MODEL
The device disclosed by the embodiment of the utility model is combined with a natural gas fuel cell in a gas field station through a differential pressure power generation technology, so that the natural gas is efficiently utilized, and meanwhile, the energy conservation and the environmental protection are realized.
The purpose of the embodiment of the utility model is realized by the following technical scheme:
the utility model provides a high-efficiency recovery device for pressure energy and chemical energy of pipeline natural gas, which comprises:
the natural gas pipeline is connected with the upstream natural gas and used for conveying the natural gas;
the pressure difference power generation device generates power by utilizing the pressure difference of natural gas;
the first heat exchanger is internally provided with a refrigerant and is used for exchanging heat with the low-temperature natural gas generated by the differential pressure generating device;
a natural gas fuel cell; generating power by using the chemical energy of the depressurized natural gas;
the second heat exchanger is used for exchanging heat between the low-temperature natural gas and the hot tail gas generated after the natural gas fuel cell generates electricity; the natural gas pipeline is communicated with the natural gas fuel cell and downstream natural gas respectively after passing through the second heat exchanger;
the control system is used for controlling the flow and cut-off of natural gas in the natural gas pipeline;
the gas-liquid separation device is used for carrying out gas-liquid separation on the hot tail gas passing through the second heat exchanger to obtain carbon dioxide and water;
and the water storage tank and the carbon dioxide recovery device are connected with the gas-liquid separation device and are respectively used for storing water and carbon dioxide, and the carbon dioxide recovery device is provided with a waste gas discharge port.
Further, the water storage tank is connected with the natural gas fuel cell.
Furthermore, the device also comprises an energy storage device, wherein the energy storage device is respectively connected with the differential pressure power generation device and the natural gas fuel cell and is used for storing electric energy.
Furthermore, the natural gas pipeline is provided with a stop valve, a check valve, a flow regulating valve and a flowmeter.
Further, the differential pressure power generation device comprises an expander, and the expander is a turbine expander, a screw expander or a turbine expander.
Furthermore, the natural gas fuel cell is a proton exchange membrane fuel cell, a molten carbonate fuel cell or a solid oxide fuel cell.
The embodiment of the utility model has the following beneficial effects:
according to the utility model, pressure energy is recovered through the differential pressure power generation equipment, and the hot tail gas generated after power generation through the natural gas fuel cell connected with the differential pressure power generation equipment is used for heating the depressurized low-temperature natural gas, so that the natural gas is efficiently utilized while the safe operation is ensured.
The main equipment of the utility model is differential pressure generating equipment and a natural gas fuel cell, which are arranged between upstream incoming gas and downstream gas transmission and are connected in parallel with the original pressure regulating equipment of a gas field station. The proposal in the scheme utilizes the pressure energy of the natural gas to generate electricity through the pressure difference generating device, the cold energy recovery system is utilized to recover the cold energy of the low-temperature natural gas after the electricity generation, the natural gas fuel cell can utilize the chemical energy of the natural gas after the pressure reduction to generate electricity, the hot tail gas generated after the electricity generation of the natural gas fuel cell can heat the expanded natural gas, and the natural gas after the expansion and the temperature reduction can be conveyed to the natural gas fuel cell and a downstream pipeline. The utility model combines the differential pressure power generation technology with the natural gas fuel cell in the gas field station, realizes the high-efficiency utilization of natural gas and simultaneously realizes energy conservation and environmental protection.
Drawings
Fig. 1 is a schematic structural diagram of a device for efficiently recovering pressure energy and chemical energy of pipeline natural gas.
Detailed Description
The present application is further described below with reference to examples. In the following description, different "one embodiment" or "an embodiment" may not necessarily refer to the same embodiment, in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art. Various embodiments may be replaced or combined, and other embodiments may be obtained according to the embodiments without creative efforts for those skilled in the art.
In order to solve the problems of pressure energy utilization and cold energy utilization in association with depressurization power generation, the utility model provides a natural gas pressure energy and chemical energy efficient utilization device based on a gas field station.
The efficient utilization process of natural gas pressure energy and chemical energy based on a gas field station is one of key technologies in a pipeline natural gas pressure energy recovery technology, and main equipment of the efficient utilization process is differential pressure power generation equipment and a natural gas fuel cell, is installed between upstream incoming gas and downstream gas transmission and is connected with original pressure regulating equipment of the gas field station in parallel. The natural gas pressure energy is utilized to generate electricity through the pressure difference generating device, the cold energy of the low-temperature natural gas is recovered by the cold energy recovery system after the electricity generation, the natural gas fuel cell can utilize the chemical energy of the natural gas after the pressure reduction to generate electricity, the hot tail gas generated after the natural gas fuel cell generates electricity can be heated for the natural gas after the expansion, and the natural gas after the expansion and the temperature reduction can be conveyed to the natural gas fuel cell and a downstream pipeline. In conclusion, the utility model provides a process scheme for efficiently utilizing the pressure energy and the chemical energy of natural gas based on a gas field station, and the gas field station is combined with a natural gas fuel cell through a differential pressure power generation technology, so that the natural gas is efficiently utilized, and meanwhile, the energy conservation and the environmental protection are realized.
The utility model provides a high-efficient recovery unit of pipeline natural gas pressure energy and chemical energy, includes:
the natural gas pipeline 1 is connected with the upstream natural gas 2 and used for conveying natural gas;
the pressure difference power generation device generates power by utilizing the pressure difference of natural gas;
a refrigerant 5 is arranged in the first heat exchanger 4 and is used for exchanging heat with the low-temperature natural gas generated by the differential pressure generating device;
a natural gas fuel cell 6; generating power by using the chemical energy of the depressurized natural gas;
the second heat exchanger 7 is used for exchanging heat between the low-temperature natural gas and the hot tail gas 8 generated by the natural gas fuel cell 6 after power generation; the natural gas pipeline 1 is respectively communicated with the natural gas fuel cell 6 and the downstream natural gas 9 after passing through a second heat exchanger 7;
the natural gas is efficiently utilized and energy-saving and environment-friendly are realized by combining a differential pressure power generation technology with a natural gas fuel cell in a gas field station;
and the control system 10 is used for controlling the flow and the cut-off of the natural gas in the natural gas pipeline 1 by the control system 10. The control system of the utility model can carry out scheduling control according to the data feedback of the flowmeter, the pressure sensor and the temperature sensor. The following three control logics are operated: when the temperature of the natural gas after the pressure difference power generation is subjected to two times of heat exchange is lower, the amount of hot tail gas can be increased by increasing the amount of the natural gas at the inlet of the natural gas fuel cell; when the temperature of the natural gas after the pressure difference power generation is carried out twice heat exchange is higher, the amount of the hot tail gas can be reduced by reducing the amount of the natural gas at the inlet of the natural gas fuel cell; when the parallel connection fails, the emergency cut-off valve is started, and only the original pressure regulating equipment of the gas field station is operated to ensure downstream gas utilization;
the gas-liquid separation device 11 is used for carrying out gas-liquid separation on the hot tail gas 8 passing through the second heat exchanger 7 to obtain carbon dioxide and water;
and the water storage tank 12 and the carbon dioxide recovery device 13 which are connected with the gas-liquid separation device 11 are respectively used for storing water and carbon dioxide, and the carbon dioxide recovery device 13 is provided with a waste gas discharge port 15. By connecting the carbon dioxide recovery device, the net zero emission of carbon dioxide can be realized. The energy storage device and the carbon dioxide recovery device in the process can be installed according to local conditions according to specific conditions of the gas field station.
In some embodiments of the present invention, the water storage tank 12 is connected to the natural gas fuel cell 6.
In some embodiments of the present invention, the present invention further comprises an energy storage device 14, and the energy storage device 14 is connected to the differential pressure power generation device and the natural gas fuel cell 6 respectively, and is used for storing electric energy.
Here, it is to be noted that: the pressure difference power generation equipment can convert the pressure energy of the natural gas into electric energy, and the generated low-temperature natural gas can exchange heat with the refrigerant through the first heat exchanger to realize cooling. The natural gas fuel cell can generate electricity by utilizing the chemical energy of the natural gas after the pressure reduction, and the pressure difference generating equipment and the natural gas fuel cell are converged into the energy storage module after generating electricity. The hot tail gas generated after the power generation of the natural gas fuel cell can heat the expanded natural gas in the second heat exchanger, so that the expanded and cooled natural gas can be conveyed to the natural gas fuel cell and a downstream pipeline. The hot tail gas after heat exchange is separated into carbon dioxide and water through the gas-liquid separator, the carbon dioxide can be recovered and stored by the carbon dioxide recovery device, and the water can be stored by the water storage tank and provided for the reforming reaction of natural gas, so that the cyclic utilization of the water is realized.
In some embodiments of the present invention, the natural gas pipeline 1 is provided with a shut-off valve, a check valve, a flow regulating valve and a flow meter.
In some embodiments, the pipe of the source station is provided with a filter 16, a first flow meter 17, a first stop valve 18, a first pressure regulating device 19 and a first check valve 20 in sequence from upstream to downstream.
In some embodiments, the device is connected to a site station pressure regulating device in parallel, and a second stop valve 21, an emergency cut-off valve 22, a first flow regulating valve 23 and a second flow meter 24 are sequentially arranged on the natural gas pipeline 1 of the device from upstream to the expansion machine 3; a third stop valve 25, a fourth stop valve 27, a second flow regulating valve 28, a second pressure regulating device 29 and a third flowmeter 30 are sequentially arranged between the second heat exchanger and the natural gas fuel cell; the natural gas line between the third stop valve 25 and the fourth stop valve 27 is connected to downstream natural gas, and a second check valve 26 is provided on the connected line. These flow meters and valves are controlled by a control system.
In some embodiments of the present invention, the pressure difference power generation device comprises an expander 3, and the expander 3 is a turbine expander, a screw expander or a turbine expander.
In some embodiments of the present invention, the natural gas fuel cell 6 is a proton exchange membrane fuel cell, a molten carbonate fuel cell, or a solid oxide fuel cell.
A method for efficiently recovering pressure energy and chemical energy of pipeline natural gas is completed by adopting the device; the device is connected with the original pressure regulating equipment of the natural gas station in parallel;
the natural gas at the upstream passes through the pressure difference power generation device and then exchanges heat through the first heat exchanger to provide cold energy, the natural gas passes through the first heat exchanger and then is heated through the second heat exchanger to reach the natural gas fuel cell, and hot tail gas generated by the natural gas fuel cell after power generation passes through the second heat exchanger and exchanges heat with the natural gas and then is subjected to gas-liquid separation to respectively collect water and carbon dioxide; the pressure difference power generation device and the natural gas fuel cell are connected with the energy storage device to store electric energy, and water is recycled and used for reforming natural gas; the control system is used for controlling the flow and the cut-off of the natural gas in the natural gas pipeline.
The utility model realizes the high-efficiency recovery function of the pressure energy of the natural gas and the chemical energy of the natural gas in the pipeline by combining the differential pressure power generation technology with the natural gas fuel cell.
The device is of a bypass type, is connected between upstream incoming gas and downstream gas transmission, is connected with the original pressure regulating equipment of the gas field station in parallel, and preferentially selects to operate differential pressure power generation equipment.
It should be noted that the above embodiments can be freely combined as necessary. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a high-efficient recovery unit of pipeline natural gas pressure energy and chemical energy which characterized in that includes:
the natural gas pipeline is connected with the upstream natural gas and used for conveying the natural gas;
the pressure difference power generation device generates power by using the pressure difference of natural gas;
the first heat exchanger is internally provided with a refrigerant and is used for exchanging heat with the low-temperature natural gas generated by the differential pressure generating device;
a natural gas fuel cell; generating power by using the chemical energy of the depressurized natural gas;
the second heat exchanger is used for heat exchange of the low-temperature natural gas and the hot tail gas generated after the natural gas fuel cell generates electricity; the natural gas pipeline is communicated with the natural gas fuel cell and downstream natural gas respectively after passing through the second heat exchanger;
the control system is used for controlling the flow and cut-off of natural gas in the natural gas pipeline;
the gas-liquid separation device is used for carrying out gas-liquid separation on the hot tail gas passing through the second heat exchanger to obtain carbon dioxide and water;
and the water storage tank and the carbon dioxide recovery device are connected with the gas-liquid separation device and are respectively used for storing water and carbon dioxide, and the carbon dioxide recovery device is provided with a waste gas discharge port.
2. The apparatus for recovering pipeline natural gas pressure energy and chemical energy efficiently as claimed in claim 1, wherein the water storage tank is connected to the natural gas fuel cell.
3. The efficient recovery device for pressure energy and chemical energy of pipeline natural gas according to claim 1, further comprising an energy storage device, wherein the energy storage device is respectively connected with the differential pressure power generation device and the natural gas fuel cell and is used for storing electric energy.
4. The efficient recovery device for pressure energy and chemical energy of pipeline natural gas according to claim 1, wherein the natural gas pipeline is provided with a stop valve, a check valve, a flow regulating valve and a flowmeter.
5. The apparatus for recovering pipeline natural gas pressure energy and chemical energy efficiently as claimed in claim 1, wherein the pressure difference power generation apparatus comprises an expander, and the expander is a turbo expander, a screw expander or a turbo expander.
6. The apparatus of claim 1, wherein the natural gas fuel cell is a proton exchange membrane fuel cell, a molten carbonate fuel cell or a solid oxide fuel cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122442281.4U CN216922245U (en) | 2021-10-11 | 2021-10-11 | High-efficient recovery unit of pipeline natural gas pressure energy and chemical energy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122442281.4U CN216922245U (en) | 2021-10-11 | 2021-10-11 | High-efficient recovery unit of pipeline natural gas pressure energy and chemical energy |
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| CN216922245U true CN216922245U (en) | 2022-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122442281.4U Active CN216922245U (en) | 2021-10-11 | 2021-10-11 | High-efficient recovery unit of pipeline natural gas pressure energy and chemical energy |
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2021
- 2021-10-11 CN CN202122442281.4U patent/CN216922245U/en active Active
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