Energy reduction and increment power generation device and process
By combining components such as precooling heat exchangers and cryogenic heat exchangers with solar energy assistance, the problems of heat exchanger impact, insufficient subcooling, and high energy consumption in cold energy power generation processes have been solved, thereby improving safety and power generation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-27
- Publication Date
- 2026-03-17
AI Technical Summary
Existing cold energy power generation processes suffer from problems such as heat exchange pipe impact within the heat exchanger, insufficient subcooling of the power generation medium, liquid in the power generation medium affecting safe operation, limited power generation from low-grade heat sources, and high energy consumption.
It employs a precooling heat exchanger, a cryogenic heat exchanger, a power generation medium circulation pump, an evaporator, a spiral separator, a high-temperature heat exchanger, and a power generation mechanism, combined with a solar heating device. Through stepped liquefaction and a porous liner uniform distributor, it ensures the subcooling of the power generation medium and utilizes green energy to increase temperature and pressure.
The safety of the energy-reducing incremental power generation device has been enhanced, ensuring subcooling, increasing power generation and reducing energy consumption.
Smart Images
Figure CN121676104A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of new energy utilization technology, and in particular to an energy-saving incremental power generation device and process. Background Technology
[0002] Cold energy power generation technology utilizes the cold energy of a low-temperature substance (refrigerant), liquefies the intermediate medium through heat exchange, and then releases the cold energy of the intermediate medium to generate electricity through processes such as pressurization, gasification, and expansion.
[0003] Currently, there are several problems and potential operational risks in cold energy power generation technology, specifically as follows: The power generation medium from the power generation unit enters the heat exchanger through a large-diameter pipe, impacting the heat exchange pipes within the heat exchanger. Furthermore, temperature differences exist within the heat exchanger, affecting the long-term safe operation of the equipment. The subcooling of the liquid power generation medium produced by the heat exchanger in the current cold energy power generation process cannot be guaranteed, posing potential safety risks to the circulating pump. This results in a significant elevation difference between the heat exchanger and the circulating pump for the power generation medium, increasing construction difficulty. The liquid power generation medium passing through the evaporator's gaseous power generation medium is prone to carrying liquid, which can enter the power generation unit and affect its safe operation. In cold energy power generation, low-grade heat sources are used for heat exchange, limiting the temperature and pressure of the power generation medium, affecting power generation output. Additionally, the high flow rate of low-grade heat sources leads to higher power consumption. Summary of the Invention
[0004] The purpose of this invention is to provide an energy-reducing incremental power generation device, which includes a precooling heat exchanger, a cryogenic heat exchanger, a power generation medium circulation pump, an evaporator, a spiral separator, a high-temperature heat exchanger, and a power generation mechanism. This device can effectively enhance the safety of the energy-reducing incremental power generation device, ensure subcooling, and increase the power generation of the process unit.
[0005] To achieve the above objectives, the present invention adopts the following technical solution, including: The precooling heat exchanger has its power generation medium inlet connected to the power generation mechanism; the liquefied natural gas inlet of the precooling heat exchanger is connected to the liquefied natural gas source; the precooling heat exchanger is used for primary heat exchange between liquefied natural gas and the power generation medium, converting the gaseous power generation medium from the power generation mechanism into a liquid power generation medium; The cryogenic heat exchanger has its power generation medium inlet connected to the power generation medium outlet of the precooling heat exchanger; the liquefied natural gas inlet of the cryogenic heat exchanger is connected to a liquefied natural gas source; the cryogenic heat exchanger is used to supply liquefied natural gas and the power generation medium for secondary heat exchange to ensure the subcooling of the power generation medium; A power generation medium circulation pump, which is connected to the power generation medium outlet of the cryogenic heat exchanger, is used to provide sequential power for the liquid power generation medium; An evaporator, connected to the power generation medium circulation pump, is used to convert the liquid power generation medium from the power generation medium circulation pump into a gaseous power generation medium; the evaporator is connected to a low-temperature heat source pipeline, which is used to provide a low-temperature heat source for the evaporator. A spiral separator, connected to the evaporator, is used to remove droplets from the gaseous power generation medium from the evaporator; A high-temperature heat exchanger, which is connected to the spiral separator, is used to allow the intermediate medium to exchange heat with the gaseous power generation medium from the spiral separator, further removing droplets from the gaseous power generation medium and raising the temperature of the power generation medium. A power generation mechanism, which is connected to the high-temperature heat exchanger, is used to allow a high-temperature power generation medium from the high-temperature heat exchanger to enter and generate electricity through expansion. A reheating device is connected to the natural gas outlet of the precooling heat exchanger and the cryogenic heat exchanger, and is used to reheat the natural gas. The first export pipeline is connected to the heating device and is used for exporting the heated natural gas. A solar heating device is connected to a high-temperature heat exchanger and a heating compensation device via an intermediate medium pipeline; it is used to provide a high-temperature heat source for the high-temperature heat exchanger and the heating compensation device. The power generation medium inlet of the precooling heat exchanger is provided with a first porous liner uniform distributor; the liquid phase power generation medium inlet of the evaporator is provided with a second porous liner uniform distributor.
[0006] Preferably, it also includes: An electric heating device, which is connected to the spiral separator and the power generation mechanism respectively, is used to heat the gaseous power generation medium from the spiral separator; A solar power generation / storage device is electrically connected to the electric heating device and the solar heating device respectively, and is used to supply power to the electric heating device and the solar heating device.
[0007] Preferably, it also includes: An NG heating device, connected to the heating replenishment device, is used to heat the natural gas from the heating replenishment device; An NG differential pressure power generation device, which is connected to the NG heating device, uses natural gas from the NG heating device to generate electricity through differential pressure. The second external pipeline is connected to the NG differential pressure power generation unit and is used to output the natural gas generated after power generation; The solar heating device is connected to the NG heating device via an intermediate medium pipeline; it is used to provide a high-temperature heat source for the NG heating device.
[0008] Preferably, the medium in the low-temperature heat source pipeline is water; the intermediate medium is one or more of water, methanol, and ethanol; and the power generation medium is ethane, propane, or a mixture thereof, wherein the mixture is a mixture of methane and ethane.
[0009] A power generation process with reduced energy consumption, using any one of the aforementioned power generation devices, includes the following steps: S1. The low-pressure gaseous power generation medium from the power generation mechanism passes sequentially through the precooling heat exchanger and the cryogenic heat exchanger, where it exchanges heat with liquefied natural gas and is converted into a cryogenic liquid-phase power generation medium. After heat exchange, the liquefied natural gas is converted into high-pressure cryogenic NG. The high-pressure cryogenic NG enters the heating device, exchanges heat with a high-temperature heat source, and is converted into high-pressure NG, which is then exported via the first external pipeline. S2. The cryogenic liquid-phase power generation medium then enters the power generation medium circulation pump and evaporator in sequence, where it exchanges heat with the low-temperature heat source in the evaporator and is converted into a gaseous power generation medium. S3. The gaseous power generation medium passes through a spiral separator and a high-temperature heat exchanger in sequence. The spiral separator removes droplets from the gaseous power generation medium. The gaseous power generation medium exchanges heat with a high-temperature heat source in the high-temperature heat exchanger and is converted into a high-temperature gaseous power generation medium, further removing droplets. S4. The high-temperature gaseous power generation medium finally enters the power generation mechanism to expand and generate electricity.
[0010] Preferably, in step S1, the high-pressure NG from the heating device passes sequentially through the NG heating device and the NG differential pressure power generation device. The NG heating device heats the high-pressure NG, converting it into a high-temperature high-pressure / low-pressure NG. The NG differential pressure power generation device uses the high-temperature high-pressure / low-pressure NG to generate electricity through differential pressure. After differential pressure power generation, the high-temperature high-pressure / low-pressure NG is converted into a medium-pressure / low-pressure NG, and then exits through the second external pipeline.
[0011] The beneficial effects of this invention are: 1. It is equipped with a pre-cooling heat exchanger and a cryogenic heat exchanger, and the stepped liquefaction can ensure the subcooling of the power generation medium; 2. The power generation medium inlet of the pre-cooling heat exchanger is equipped with a first porous liner uniform distributor, which can effectively reduce the impact of the power generation medium on the heat exchange tube and improve the safety of the energy-saving incremental power generation device; 3. It is equipped with a solar heating device, which utilizes green solar energy to increase the temperature and pressure of the power generation medium, increase the power generation, and effectively solve the problem of low power generation and high energy consumption. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of an energy-reducing incremental power generation device according to the present invention.
[0013] Figure 2 This is a schematic diagram of the precooling heat exchanger in this invention.
[0014] Figure 3 This is a schematic diagram of the evaporator in this invention. Detailed Implementation
[0015] The invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.
[0016] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.
[0017] like Figure 1-3 As shown, an energy-reducing incremental power generation device of the present invention includes: The precooling heat exchanger 110 has its power generation medium inlet connected to the power generation mechanism 170 via a first pipeline 401; the liquefied natural gas inlet of the precooling heat exchanger 110 is connected to the liquefied natural gas source via a second pipeline 402; the precooling heat exchanger 110 is used for primary heat exchange between liquefied natural gas and the power generation medium, converting the gaseous power generation medium from the power generation mechanism 170 into a liquid power generation medium; The cryogenic heat exchanger 120 has its power generation medium inlet connected to the power generation medium outlet of the precooling heat exchanger via a third pipeline 403; the liquefied natural gas inlet of the cryogenic heat exchanger 120 is connected to a liquefied natural gas source via a fourth pipeline 404; the cryogenic heat exchanger 120 is used to supply liquefied natural gas and the power generation medium for secondary heat exchange to ensure the subcooling of the power generation medium. A power generation medium circulation pump 130 is connected to the power generation medium outlet of the cryogenic heat exchanger 120 via a fifth pipeline 405, and is used to provide sequential power for the liquid power generation medium. Evaporator 140 is connected to the power generation medium circulation pump 130 via a sixth pipeline 406, for converting the liquid power generation medium from the power generation medium circulation pump 130 into a gaseous power generation medium; evaporator 140 is connected to a low-temperature heat source pipeline 811 and a low-temperature heat source pipeline 812 respectively, the low-temperature heat source pipeline 811 being used to provide a low-temperature heat source for the evaporator; as a preferred embodiment, a twenty-first isolation valve 521 is provided on the low-temperature heat source pipeline 811; a twenty-second isolation valve 522 is provided on the low-temperature heat source pipeline 812; A spiral separator 150, which is connected to the evaporator via a seventh pipe 407, is used to remove droplets from the gaseous power generation medium from the evaporator. The high-temperature heat exchanger 160 is connected to the spiral separator 150 via the eighth pipe 408, and is used to allow the intermediate medium to exchange heat with the gaseous power generation medium from the spiral separator 150, further removing droplets from the gaseous power generation medium and raising the temperature of the power generation medium. The power generation mechanism 170 is connected to the high-temperature heat exchanger 160 via the ninth pipeline 409, and is used to allow the high-temperature power generation medium from the high-temperature heat exchanger 160 to enter and generate electricity through expansion. The heating device 210 is connected to the natural gas outlet of the precooling heat exchanger 110 via the tenth pipe 410; the natural gas outlet of the cryogenic heat exchanger 120 is connected to the tenth pipe 410 via the eleventh pipe 411, thereby connecting to the heating device 210; the heating device 210 is used to heat the natural gas. The first export pipeline 610 is connected to the heating device 210 for exporting heated natural gas. Preferably, an eleventh isolation valve 511 is provided on the eleventh pipeline 411. A nineteenth isolation valve 519 is provided on the first export pipeline 610. The solar heating device 230 is connected to the high-temperature heat exchanger 160 via intermediate medium pipelines 701 and 702; the solar heating device 230 is connected to the heat replenishment device 210 via intermediate medium pipelines 703 and 704; these provide a high-temperature heat source for the high-temperature heat exchanger 160 and the heat replenishment device 210. Preferably, a fifteenth isolation valve 515 is provided on the intermediate medium pipeline 703; and a sixteenth isolation valve 516 is provided on the intermediate medium pipeline 704. Specifically, a first porous liner uniform distributor 111 is provided at the power generation medium inlet of the precooling heat exchanger 110; a second porous liner uniform distributor 141 is provided at the liquid phase power generation medium inlet of the evaporator 140; a first isolation valve 501 is provided on the first pipeline 401; a second isolation valve 502 is provided on the second pipeline 402; a third isolation valve 503 is provided on the third pipeline 403; a fourth isolation valve 504 is provided on the fourth pipeline 404; a sixth isolation valve 506 is provided on the sixth pipeline 406; an eighth isolation valve 508 is provided on the eighth pipeline 408; and a ninth isolation valve 509 is provided on the ninth pipeline 409.
[0018] In another embodiment, the device further includes: an electric heating device 250 connected to an eighth pipe 408 via a twelfth pipe 412, thereby connecting to the spiral separator 150; the electric heating device 250 connected to a ninth pipe 409 via a thirteenth pipe 413, thereby connecting to the power generation mechanism 170; used to heat the gaseous power generation medium from the spiral separator 150; preferably, a twelfth isolation valve 512 is provided on the twelfth pipe 412; a thirteenth isolation valve 513 is provided on the thirteenth pipe 413; and a solar power generation / storage device 510 is electrically connected to the electric heating device 250 and the solar heating device 230 respectively, for supplying power to the electric heating device 250 and the solar heating device 230.
[0019] In another embodiment, the system further includes: an NG heating device 410 connected to a first export pipeline 610 via a fourteenth pipeline 414, thereby connecting to the supplementary heating device 210 for heating the natural gas from the supplementary heating device 210; an NG differential pressure power generation device 420 connected to the NG heating device 410 via a fifteenth pipeline 415 for generating electricity using the natural gas from the NG heating device; and a second export pipeline 620 connected to the NG differential pressure power generation device 420 for exporting the generated natural gas. Preferably, a fourteenth isolation valve 514 is provided on the fourteenth pipeline 414. A twentieth isolation valve 520 is provided on the second export pipeline 620. The solar heating device 230 is connected to the NG heating device 410 via intermediate medium pipelines 705 and 706 to provide a high-temperature heat source for the NG heating device 410. A seventeenth isolation valve 517 is provided on the intermediate medium pipeline 705, and an eighteenth isolation valve 518 is provided on the intermediate medium pipeline 706.
[0020] In another embodiment, the medium in the low-temperature heat source pipeline 811 and the low-temperature heat source pipeline 812 is water; the intermediate medium is one or more of water, methanol, and ethanol; and the power generation medium is ethane, propane, or a mixture thereof, wherein the mixture is a mixture of methane and ethane.
[0021] A power generation technology that reduces energy consumption and increases power generation capacity, using any one of the aforementioned power generation devices. S1. The low-pressure gaseous power generation medium from the power generation mechanism 170 passes sequentially through the precooling heat exchanger 110 and the cryogenic heat exchanger 120, where it exchanges heat with liquefied natural gas and is converted into a cryogenic liquid-phase power generation medium. After heat exchange, the liquefied natural gas is converted into high-pressure cryogenic NG. The high-pressure cryogenic NG enters the heating device 210, where it exchanges heat with a high-temperature heat source and is converted into high-pressure NG, which is then exported via the first export pipeline 610. S2. The cryogenic liquid phase power generation medium then enters the power generation medium circulation pump 130 and evaporator 140 in sequence, where it exchanges heat with the low temperature heat source in the evaporator 140 and is converted into a gaseous power generation medium. S3. The gaseous power generation medium passes sequentially through a spiral separator 150 and a high-temperature heat exchanger 160. The spiral separator 150 removes droplets from the gaseous power generation medium. The gaseous power generation medium exchanges heat with a high-temperature heat source in the high-temperature heat exchanger 160, transforming it into a high-temperature gaseous power generation medium, further removing droplets. S4. The high-temperature gaseous power generation medium finally enters the power generation mechanism 170 to expand and generate electricity.
[0022] In another embodiment, in step S1, the high-pressure NG from the heating device 210 passes sequentially through the NG heating device 410 and the NG differential pressure power generation device 420. The NG heating device 410 heats the high-pressure NG, converting it into a high-temperature high-pressure / low-pressure NG. The NG differential pressure power generation device 420 uses the high-temperature high-pressure / low-pressure NG to generate differential pressure power. After differential pressure power generation, the high-temperature high-pressure / low-pressure NG is converted into a medium-pressure / low-pressure NG, and then exits through the second external transmission pipeline 620.
[0023] In summary, the present invention provides an energy-reducing incremental power generation device, which includes a pre-cooling heat exchanger 110 and a cryogenic heat exchanger 120. Stepped liquefaction ensures the subcooling of the power generation medium. The power generation medium inlet of the pre-cooling heat exchanger 110 is equipped with a first porous liner uniform distributor 111, which can effectively reduce the impact of the power generation medium on the heat exchange tube and enhance the safety of the energy-reducing incremental power generation device. A solar heating device 230 is provided, which utilizes green solar energy to increase the temperature and pressure of the power generation medium, thereby increasing the power generation and effectively solving the problems of low power generation and high energy consumption.
[0024] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.
Claims
1. A down-regulation incremental power generation device, characterized by, The application relates to a natural gas power generation system, which comprises the following components: a precooling heat exchanger, the power generation medium inlet of which is connected with a power generation mechanism; the liquefied natural gas inlet of the precooling heat exchanger is connected with a liquefied natural gas source; the precooling heat exchanger is used for primary heat exchange between the liquefied natural gas and the power generation medium, and converts the gaseous power generation medium from the power generation mechanism into liquid power generation medium; a deep cooling heat exchanger, the power generation medium inlet of which is connected with the power generation medium outlet of the precooling heat exchanger; the liquefied natural gas inlet of the deep cooling heat exchanger is connected with a liquefied natural gas source; the deep cooling heat exchanger is used for secondary heat exchange between the liquefied natural gas and the power generation medium, and ensures the supercooling degree of the power generation medium; a power generation medium circulating pump, which is connected with the power generation medium outlet of the deep cooling heat exchanger, and is used for sequentially driving the liquid power generation medium; an evaporator, which is connected with the power generation medium circulating pump, and is used for converting the liquid power generation medium from the power generation medium circulating pump into gaseous power generation medium; the evaporator is connected with a low-temperature heat source pipeline, and the low-temperature heat source pipeline is used for providing the evaporator with low-temperature heat source; a spiral separator, which is connected with the evaporator, and is used for removing liquid drops in the gaseous power generation medium from the evaporator; a high-temperature heat exchanger, which is connected with the spiral separator, and is used for heat exchange between the intermediate medium and the gaseous power generation medium from the spiral separator, further removes liquid drops in the gaseous power generation medium, and increases the temperature of the power generation medium; a power generation mechanism, which is connected with the high-temperature heat exchanger, and is used for the gaseous power generation medium from the high-temperature heat exchanger to enter and expand to generate power; a temperature compensation device, which is connected with the natural gas outlets of the precooling heat exchanger and the deep cooling heat exchanger, and is used for compensating the temperature of the natural gas; a first external pipeline, which is connected with the temperature compensation device, and is used for external transmission of the temperature-compensated natural gas; a solar heating device, which is connected with the high-temperature heat exchanger and the temperature compensation device through an intermediate medium pipeline, and is used for providing the high-temperature heat exchanger and the temperature compensation device with high-temperature heat source. A first porous lining distributor is arranged at the power generation medium inlet of the precooling heat exchanger; a second porous lining distributor is arranged at the liquid-phase power generation medium inlet of the evaporator.
2. The energy decrementing power generating device of claim 1, wherein, The application further comprises: an electric heating device, which is connected with the spiral separator and the power generation mechanism, and is used for heating the gaseous power generation medium from the spiral separator; a solar power generation / storage device, which is electrically connected with the electric heating device and the solar heating device, and is used for supplying the electric heating device and the solar heating device with power.
3. The energy decrementing power generating device of claim 2, wherein, The application further comprises: an NG temperature increasing device, which is connected with the temperature compensation device, and is used for increasing the temperature of the natural gas from the temperature compensation device; an NG differential pressure power generation device, which is connected with the NG temperature increasing device, and is used for differential pressure power generation by using the natural gas from the NG temperature increasing device; a second external pipeline, which is connected with the NG differential pressure power generation device, and is used for outputting the natural gas after power generation; The medium in the low-temperature heat source pipeline is water; the intermediate medium is one or more of water, methanol and ethanol; and the power generation medium is ethane, propane or a mixed agent, wherein the mixed agent is a mixture of methane and ethane.
4. The energy decrementing power generating device of claim 1, wherein: 5. A process for the production of incremental power by energy reduction, using the device for the production of incremental power by energy reduction according to any one of claims 1 to 4, characterized in that, The method comprises the following steps: S1, low-pressure gaseous power generation medium from the power generation mechanism successively passes through the pre-cooling heat exchanger and the cryogenic heat exchanger, exchanges heat with liquefied natural gas in the pre-cooling heat exchanger and the cryogenic heat exchanger, and is converted into cryogenic liquid-phase power generation medium; the liquefied natural gas is converted into high-pressure low-temperature NG after heat exchange, the high-pressure low-temperature NG enters the temperature compensation device, exchanges heat with a high-temperature heat source, is converted into high-pressure NG, and is exported through a first export pipeline; S2, the cryogenic liquid-phase power generation medium successively enters the power generation medium circulating pump and the evaporator, exchanges heat with a low-temperature heat source in the evaporator, and is converted into gaseous power generation medium; S3, the gaseous power generation medium successively passes through the spiral separator and the high-temperature heat exchanger; the spiral separator removes liquid droplets in the gaseous power generation medium; the gaseous power generation medium exchanges heat with a high-temperature heat source in the high-temperature heat exchanger, is converted into high-temperature gaseous power generation medium, and further removes liquid droplets; S4, the high-temperature gaseous power generation medium finally enters the power generation mechanism to perform expansion power generation.
6. The energy-reduction upscaling power generation process of claim 5, wherein: In step S1, the high-pressure NG from the temperature compensation device successively passes through the NG temperature increasing device and the NG differential pressure power generation device, the NG temperature increasing device increases the temperature of the high-pressure NG, the high-pressure NG is converted into high-temperature high-pressure / low-pressure NG, the NG differential pressure power generation device performs differential pressure power generation by using the high-temperature high-pressure / low-pressure NG, the high-temperature high-pressure / low-pressure NG is converted into medium-pressure / low-pressure NG after differential pressure power generation, and is exported through a second export pipeline.