CN111852602B - Transcritical carbon dioxide power generation system based on vortex tube - Google Patents
Transcritical carbon dioxide power generation system based on vortex tube Download PDFInfo
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- CN111852602B CN111852602B CN202010575032.XA CN202010575032A CN111852602B CN 111852602 B CN111852602 B CN 111852602B CN 202010575032 A CN202010575032 A CN 202010575032A CN 111852602 B CN111852602 B CN 111852602B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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Abstract
The invention discloses a supercritical carbon dioxide power generation system based on a vortex tube, and CO2The outlet of the turbine is divided into two paths, one path is connected with the generatorThe other path is connected with an inlet at the top of the vortex tube through a cooler, and an outlet of the vortex tube is divided into three paths for dividing medium-pressure CO2The fluid is divided into three low-pressure fluids, one path of which passes through CO in sequence2Working medium pump and heater and CO2The inlet of the turbine is connected; the remaining two paths are passed through CO2The compressor is connected to the inlet of the cooler. The invention solves the problem of CO in high-temperature environment2The difficulty of difficult condensation reduces the irreversible loss of the system and improves the generating efficiency of the system.
Description
Technical Field
The invention belongs to the technical field of low-temperature power generation, and particularly relates to a supercritical carbon dioxide power generation system based on a vortex tube.
Background
In recent years, low-temperature renewable energy and industrial waste heat power generation technologies have received much attention in order to alleviate energy problems and reduce environmental pollution.
Transcritical CO2The power generation technology is a technology for generating power by efficiently utilizing low-temperature renewable energy and industrial waste heat, and has the characteristics of compact structure, wide temperature range of a heat source and the like. However, CO2The critical temperature is low (only 31 ℃), and the condensation is difficult in a high-temperature environment. Therefore, transcritical CO2The problem that the working medium is difficult to condense in the high-temperature environment of the power generation system is urgently needed to be solved.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a supercritical carbon dioxide power generation system based on a vortex tube to generate CO in a high temperature environment, aiming at the defects in the prior art2The fluid condenses.
The invention adopts the following technical scheme:
transcritical carbon dioxide power generation system based on vortex tubeSystem comprising CO2Turbine, CO2The outlet of the turbine is divided into two paths, one path is connected with the generator, the other path is connected with the inlet at the top of the vortex tube through the cooler, and the outlet of the vortex tube is divided into three paths for dividing medium-pressure CO2The fluid is divided into three low-pressure fluids, one path of which passes through CO in sequence2Working medium pump and heater and CO2The inlet of the turbine is connected; the remaining two paths are passed through CO2The compressor is connected to the inlet of the cooler.
Specifically, the outlet at the bottom of the vortex tube and CO2Inlet connection of working medium pump for discharging saturated liquid CO in vortex tube2A fluid; CO22The outlet of the working medium pump is connected with the working medium side inlet of the heater; working medium side outlet and CO of heater2The inlet of the turbine is connected.
Specifically, outlets on the left side and the right side of the vortex tube are respectively connected with CO2Inlet connection of compressor, saturated gaseous CO in vortex tube2The fluid flows out from the cold end pipe at the right side of the vortex tube to overheat gaseous CO2Fluid flows out of the cold-end tube on the left side of the vortex tube.
Specifically, the cooler is connected with external cooling water through a water inlet pipe and a water outlet pipe respectively, and the flowing directions of the cooling water in the water inlet pipe and the water outlet pipe and CO in the cooler2The flow direction of (a) is opposite.
Specifically, the heater is connected with an external heat source fluid or heat conducting oil, and the flow direction of the heat source fluid or the heat conducting oil and CO in the heater2The flow direction of (a) is opposite.
Compared with the prior art, the invention has at least the following beneficial effects:
the supercritical carbon dioxide power generation system based on the vortex tube is scientific in structural design, the vortex tube is arranged in the traditional supercritical carbon dioxide power generation system, and the vortex tube is utilized to carry out CO conversion2The fluid is condensed to a saturated liquid state, thereby solving the problem of CO in a high-temperature environment2The difficult problem of being difficult to the condensation, simultaneously vortex tube simple structure, the loss is less, has improved system power generation efficiency, has reduced system cost.
Further, an outlet at the bottom of the vortex tube is connected with the CO2The working medium pump is connected with the working medium pump,CO condensed to a saturated liquid state2Working medium is treated with CO2After the working medium pump is pressurized to be supercritical, the working medium pump enters the heater again to absorb heat, and the whole power generation cycle is completed.
Further, saturated gaseous CO at the left and right outlets of the vortex tube2Fluid and superheated gaseous CO2The fluid is merged and enters CO2The compressor is compressed and then re-enters the cycle.
Furthermore, the flow direction of the cooling water in the water inlet pipe and the water outlet pipe is opposite to the flow direction of the CO2 in the cooler, so that the CO in the cooler can be reduced2Irreversible loss of heat exchange with cooling water improves the generating efficiency of the system.
Further, the flowing direction of the heat source fluid or the heat conducting oil and CO in the heater2The flow direction of the heat exchanger is opposite, so that CO in the heat exchanger can be reduced2And irreversible loss of heat exchange with heat source fluid or heat conduction oil improves the power generation efficiency of the system.
In conclusion, the invention solves the problem of CO in high-temperature environment2The difficulty of difficult condensation reduces the irreversible loss of the system and improves the generating efficiency of the system.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
Wherein: 1.CO2A turbine; CO 2.CO2A compressor; 3. a cooler; 4. a vortex tube; CO22A working medium pump; 6. a heater; 7. an electric generator.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
The invention provides a supercritical carbon dioxide power generation system based on a vortex tube, which utilizes the energy separation effect of the vortex tube to separate CO2Condensing into liquid state at normal temperature to solve the problem of transcritical CO2The working medium of the power generation system is difficult to be condensed in a high-temperature environment.
Referring to fig. 1, the present invention relates to a supercritical carbon dioxide power generation system based on a vortex tube, which comprises CO2Turbine 1, CO2Compressor 2, cooler 3, vortex tube 4, CO2Working medium pump 5, heater 6 and generator 7.
CO2The outlet of the turbine 1 is divided into two paths, one path is connected with the generator 7, the other path is connected with the vortex tube 4 through the cooler 3, and the outlet of the vortex tube 4 is divided into two pathsOne path is through CO2Working medium pump 5 and heater 6, and CO2The inlet of the turbine 1 is connected; the other path is through CO2The compressor 2 is connected to an inlet of the cooler 3.
CO2The outlet of the turbine 1 is connected with the inlet of the cooler 3; the outlet of the cooler 3 is connected to the inlet at the top of the vortex tube 4.
Outlet at the bottom of vortex tube 4 and CO2The inlet of the working medium pump 5 is connected; CO22The outlet of the working medium pump 5 is connected with the working medium side inlet of the heater 6; working medium side outlet and CO of heater 62The inlets of the turbines 1 are connected.
Outlets at the left side and the right side of the vortex tube 4 are respectively connected with CO2The inlet of the compressor 2 is connected; CO22The outlet of the compressor 2 is connected with the inlet of the cooler 3; CO22The turbine 1 is connected to a generator 7.
The cooler 3 is also connected with external cooling water through a water inlet pipe and a water outlet pipe, and the flowing directions of the water in the water inlet pipe and the water in the water outlet pipe and CO in the cooler 32The flow direction of (a) is opposite.
The heater 6 is also connected with external heat source fluid or heat-conducting oil, and the flow direction of the heat source fluid or the heat-conducting oil is connected with CO in the heater 62The flow direction of (a) is opposite.
For the present invention, CO2Turbine 1, cooler 3, vortex tube 4, CO2The working medium pump 5 and the heater 6 are sequentially connected in series, and outlets at the left side and the bottom of the vortex tube 4 and CO are connected with the outlet2Compressor 2 inlet connection, CO2The outlet of the compressor 2 is connected with the inlet of the cooler 3. It should be noted that the vortex tube 4 uses the vortex action of the fluid to realize energy separation, and one stream of medium-pressure CO is separated2The fluid being divided into three low-pressure streams, each of which is saturated gaseous CO2Saturated liquid CO2With superheated gaseous CO2A fluid; saturated gaseous CO2The fluid flows out from the cold end pipe at the right side of the vortex tube 4 to overheat gaseous CO2The fluid flows out from the hot end pipe at the left side of the vortex tube 4 and is saturated with liquid CO2The fluid is thrown to the wall surface under the action of centrifugal force and flows out from the outlet at the bottom of the vortex tube through the liquid discharge structure on the wall surface.
The working process of the supercritical carbon dioxide power generation system based on the vortex tube is as follows:
CO2turbine outlet medium pressure CO2Fluid and medium pressure CO from the compressor outlet2After the fluids are merged, the heat is released to external cooling water through a cooler and the temperature is reduced to a lower temperature, wherein the pressure indicated by the medium pressure is more than or equal to the critical pressure (7.18MPa) of CO2, and is usually less than or equal to 10 MPa.
Reduced temperature medium pressure CO2The fluid flows into the vortex tube from the top inlet of the vortex tube, and is separated into three strands of subcritical low-pressure fluid, namely saturated gaseous CO2Saturated liquid CO2With superheated gaseous CO2The pressure of the fluid at low pressure is less than the critical pressure (7.18MPa) of CO2, and is usually 4-6 MPa.
Low pressure saturated liquid CO2Passing the fluid through CO2The working medium pump pressurizes to trans-critical high-pressure state and high-pressure liquid CO2The fluid absorbs heat from heat source fluid or heat transfer oil in the steam generation process, and is heated to a superheated state, high-pressure superheated CO2Inflow of fluid into CO2In the turbine, a generator is driven to generate electricity; the high pressure is a pressure of CO2 critical pressure (7.18MPa) or more, usually 15 to 25 MPa.
Low pressure saturated gaseous CO2Fluid and low pressure superheated gaseous CO2The fluid is merged and flows into CO2Pressurized to medium pressure in a compressor, medium pressure gaseous CO2The fluid flows into the cooler to release heat to the external cooling water to be cooled to a lower temperature, and then enters the vortex tube again.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Calculated, the system of the invention is under the given condition
The efficiency is 19.46 percent, the power generation efficiency is 6.73 percent, and the power generation amount is 74.56 kW; the given conditions were calculated as follows:
in conclusion, the supercritical carbon dioxide power generation system based on the vortex tube is scientific and reasonable in structural design, and the problem of effectively solving the problem of supercritical CO is solved by adding the vortex tube in the traditional supercritical carbon dioxide power generation system and condensing carbon dioxide to be in a liquid state by using the energy separation effect of the vortex tube2The working medium is difficult to be condensed in the high-temperature environment of the power generation system.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (1)
1. A supercritical carbon dioxide power generation system based on a vortex tube is characterized by comprising CO2Turbine (1), CO2The outlet of the turbine (1) is divided into two paths, one path is connected with the generator (7), the other path is connected with the inlet at the top of the vortex tube (4) through the cooler (3), and the outlet of the vortex tube (4) is divided into three paths for dividing medium-pressure CO into three paths2The fluid is divided into three low-pressure fluids, one path of which passes through CO in sequence2Working medium pump (5) and heater (6) are connected with CO2The inlet of the turbine (1) is connected; the remaining two paths are passed through CO2Compressor (2) and cooler(3) The cooler (3) is respectively connected with external cooling water through a water inlet pipe and a water outlet pipe, and the flowing directions of the cooling water in the water inlet pipe and the water outlet pipe and CO in the cooler (3)2The flow direction of (2) is opposite;
an outlet at the bottom of the vortex tube (4) and CO2The inlet of the working medium pump (5) is connected and used for discharging saturated liquid CO in the vortex tube (4)2A fluid; CO22The outlet of the working medium pump (5) is connected with the working medium side inlet of the heater (6); working medium side outlet and CO of heater (6)2The inlet of the turbine (1) is connected, and the outlets on the left side and the right side of the vortex tube (4) are respectively connected with CO2The inlet of the compressor (2) is connected with saturated gaseous CO in the vortex tube (4)2The fluid flows out from the cold end pipe at the right side of the vortex tube (4) to overheat gaseous CO2The fluid flows out from the heat end pipe at the left side of the vortex tube (4), the heater (6) is connected with external heat source fluid or heat conducting oil, and the flowing direction of the heat source fluid or the heat conducting oil and CO in the heater (6)2The flow direction of (2) is opposite;
the working process is as follows:
CO2turbine outlet medium pressure CO2Fluid and medium pressure CO from the compressor outlet2After the fluid is converged, the fluid is cooled to a lower temperature by heat release of external cooling water through a cooler, and the medium pressure is 7.18-10 MPa;
reduced temperature medium pressure CO2The fluid flows into the vortex tube from the top inlet of the vortex tube, and is separated into three strands of subcritical low-pressure fluid, namely saturated gaseous CO2Saturated liquid CO2With superheated gaseous CO2The low-pressure of the fluid is 4-6 MPa;
low pressure saturated liquid CO2Passing the fluid through CO2The working medium pump pressurizes to trans-critical high-pressure state and high-pressure liquid CO2The fluid absorbs heat from heat source fluid or heat transfer oil in the steam generation process, and is heated to a superheated state, high-pressure superheated CO2Inflow of fluid into CO2In the turbine, a generator is driven to generate electricity; the high pressure is 15-25 MPa;
low pressure saturated gaseous CO2Fluid and low pressure superheated gaseous CO2The fluid is merged and flows into CO2Pressurized to medium pressure in a compressor, medium pressure gaseous CO2The fluid flows into the cooler to release heat to the external cooling water to be cooled to a lower temperature, and then enters the vortex tube again.
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| CN117662266A (en) * | 2023-12-27 | 2024-03-08 | 中国核动力研究设计院 | Vortex generator and supercritical carbon dioxide energy conversion system |
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| CN101017036A (en) * | 2007-03-08 | 2007-08-15 | 上海交通大学 | Refrigerating system using swirling flow ejector |
| CN103727697A (en) * | 2014-01-26 | 2014-04-16 | 天津商业大学 | High pressure gas vortex expanded carbon dioxide low temperature refrigerating system |
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| JPH1026029A (en) * | 1996-07-10 | 1998-01-27 | Mitsubishi Heavy Ind Ltd | Heat exchanger for gas turbine engine |
| US6389818B2 (en) * | 2000-03-03 | 2002-05-21 | Vortex Aircon, Inc. | Method and apparatus for increasing the efficiency of a refrigeration system |
| US20030167792A1 (en) * | 2002-03-06 | 2003-09-11 | Via Holdings, Llc | Refrigeration system with liquid refrigerant injection to the condenser |
| CN110530045B (en) * | 2019-07-09 | 2020-07-28 | 西安交通大学 | Transcritical CO2System multifunctional defogging and dehumidifying system and control method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101017036A (en) * | 2007-03-08 | 2007-08-15 | 上海交通大学 | Refrigerating system using swirling flow ejector |
| CN103727697A (en) * | 2014-01-26 | 2014-04-16 | 天津商业大学 | High pressure gas vortex expanded carbon dioxide low temperature refrigerating system |
| CN204987534U (en) * | 2015-07-31 | 2016-01-20 | 天津商业大学 | Solar energy vortex refrigerating system |
| CN205330748U (en) * | 2015-12-23 | 2016-06-22 | 德州高科力液压有限公司 | Utilize high -efficient heating power circulation system of vortex tube |
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