CN104179531A - Heat-work conversion mechanism based on open-close coupling thermodynamic cycle - Google Patents
Heat-work conversion mechanism based on open-close coupling thermodynamic cycle Download PDFInfo
- Publication number
- CN104179531A CN104179531A CN201410356979.6A CN201410356979A CN104179531A CN 104179531 A CN104179531 A CN 104179531A CN 201410356979 A CN201410356979 A CN 201410356979A CN 104179531 A CN104179531 A CN 104179531A
- Authority
- CN
- China
- Prior art keywords
- heat
- position valve
- energy
- heat exchange
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a heat-work conversion mechanism based on open-close coupling thermodynamic cycle, and belongs to the field of compressed air energy storage and utilization. The heat-work conversion mechanism is mainly used for a liquefied air energy storage system, an open-close coupling thermodynamic cycle implementation method is provided, accordingly, the heat-work conversion efficiency of liquefied air can be substantially improved, the energy utilization rate of the liquefied air is increased, and the overall efficiency of the energy storage system is improved. A large amount of cold energy can be produced in the endothermic process of liquefied air gasification, and the cold energy is an important part of liquefied air energy storage. The direct utilization manner of cold energy utilization and heat-work conversion coupling is used, a compression cycle is introduced on the basis of conventional thermodynamic cycle, the cold energy is directly converted into mechanical work, and the conversion efficiency between liquefied air energy and mechanical work is improved. The system mechanism can simultaneously utilize expansion energy and cold energy of liquefied air, and the efficiency of the system mechanism is substantially improved.
Description
Technical field:
The invention belongs to compressed air energy storage and utilize field, relating to the hot merit converting system of liquid air energy-storage system.
Background technique:
The environmental pollution problem that the burning of fossil fuel brings is day by day serious.Show as PM2.5 index and exceed standard on a large scale, annual haze number of days rises year by year, and CO2 emission constantly increases, and everything is inseparable with the burning of fossil fuel.
Therefore,, when combustion of fossil fuel technical research is constantly carried out, the exploration of new energy technology is also significantly advancing.The new energy such as current various countries develop actively wind energy, nuclear energy, solar energy.Accounting in the use of China's new energy in total energy only 7%, estimates will reach 15% at the year two thousand twenty
Renewable energy sources is as the important component part of new energy, be technical and cost on the most competitive new energy form, as wind energy and solar energy.At present the accounting of the use of renewable energy sources in total energy only 1.5%, estimates will reach 6% at the year two thousand twenty.2011, world's wind-powered electricity generation and photovoltaic generation total installation of generating capacity reached respectively 2.38 hundred million kilowatts and 0.69 hundred million kilowatt.But the renewable energy sourcess such as wind energy and solar energy have intermittent and instable feature, although electric motor power is huge, can not access on a large scale at present power grid application.
The large scale storage technology of renewable energy sources can address the above problem, so far, only have in the world the country such as U.S., moral to complete the foundation in a small amount of compressed-air energy storage power station, its reason is that compressed-air energy-storage system needs huge Natural Caves store compressed air.Therefore, not extensive use of compressed air energy storage technology.
Liquefied air energy storage can reduce 97% by energy storage space requirement, compares the energy storage of conventional compression air with the high advantage of its energy storage density, is applicable to the large scale storage of renewable energy sources, has broad application prospects.
Liquefied air energy storage principle: when power requirement is less than electrical network supply, unnecessary electric energy drive motor drives gas liquefaction system, and air enters liquefied air system, through overcompression and the cooling low-temperature liquefaction air that becomes, stores electric energy with the form of liquefied air; When power requirement is greater than electrical network supply, adopt cryopump by after the liquefied air supercharging of low-temperature liquid storage tank, with the air heat-exchange of normal temperature, gasification after liquefied air heat absorption, pressure raises and the promotion turbine generation that expands, and realizes the hot merit conversion of liquefied air.
In liquefied air gasification endothermic process, can produce a large amount of " cold ", and cold is the important component part of liquefied air stored energy, making full use of of cold is the key issue in liquefied air energy storage technology.
There are at present two kinds of technology paths that address this problem.
A kind of indirect utilization mode based on conventional air piece-rate system, utilize " cold " that normal temperature air is cooling, and the air that contains " cold " importing conventional air piece-rate system, make industrial products liquid nitrogen and liquid oxygen, to improve liquefied air capacity usage ratio.
Another kind be cryogenic energy utilization and hot merit conversion coupling directly utilize mode, by introduce a compression cycle on the basis of traditional thermodynamic cycle, directly cold is converted into mechanical work, to improve liquefied air energy-mechanical work conversion ratio.
In sum, thereby the direct target of energy-storage system is output, mechanical work is converted to electric energy, and the latter is the mode that a kind of cold directly utilizes, thereby has the potentiality that improve energy-storage system efficiency.Therefore, liquefied air hot merit switch technology is liquefied air energy-storage system key technology urgently to be resolved hurrily.
Within 1996, Ordonez proposes the motor taking liquid nitrogen as power first, make liquid nitrogen absorb heat gasification, after gasification, pressure increases, then drive turbine or piston output work using liquid nitrogen as pressure source, the complete low-pressure nitrogen that does work is discharged by relief opening, as Fig. 1, Ordonez adopts open cycle to utilize the characteristic of liquid nitrogen expanded by heating to realize hot merit conversion, then taking open cycle as fundamental analysis stored energy in liquid nitrogen.
Within 1998, Knowlen adopts enclosed Rankine cycle, in acting working medium compression process, absorb the heat of compression using liquid nitrogen as low-temperature receiver, utilize the temperature difference of liquid nitrogen and atmosphere environment to realize the conversion of cold energy and mechanical work, show that by theory analysis the liquid nitrogen of unit mass can realize hot merit conversion 300-450kJ/kg, and the potentiality that liquid nitrogen hot merit is changed are 760kJ/kg, theoretical efficiency is 40%-60%.Within 1998, Plummer utilizes above-mentioned principle to process experimental prototype, and records the actual hot merit of unit mass and change amount into 190kJ/kg, and practical efficiency is 25%.Within 2000, Ordonez adopts a kind of improved Closed Brayton Power Cycle to realize the raising of theoretical efficiency, obtains unit mass hot merit conversion amount 482kJ/kg, and theoretical efficiency is 63%.
The cold energy ability that is mechanical energy by thermal power transfer that to be liquid nitrogen have from external world's heat absorption, expansion energy is pressure rise and the ability of the acting of expanding to external world that has after liquid nitrogen gasification.The character of two kinds of energy is completely different, for this reason, open cycle technology is applied to liquefied air energy-storage system by Chen Hai life in 2007, realized the conversion of expansion energy-mechanical work, and utilize cold energy to prepare liquefied air, as the raw material of next energy storage circulation hot merit conversion.But the preparation circulation of liquefied air can bring cold loss of energy, thereby cause declining to a great extent of hot merit conversion efficiency.Therefore the thermodynamic cycle of, finding the conversion of a kind of expansion energy and cold energy coupling hot merit is problem demanding prompt solution.
Summary of the invention
Object of the present invention:
A kind of hot merit switch technology that improves liquefied air hot merit conversion efficiency is proposed.
Advantage of the present invention: directly the cold energy of liquefied air is converted to mechanical energy, improves the utilization ratio of cold energy.
Brief description of the drawings
Fig. 1 is the hot merit switching mechanism schematic diagram of open-close manifold type thermodynamic cycle
1. two-position valve, 2. work tank, 3. fan, 4. heat exchanging tube, 5. piston cylinder, 6. heat exchange tank, 7. heat exchanger, 8. two-position valve, 9. ascending pipe, 10. pipeline, 11. pipelines
Technological scheme of the present invention:
By work tank (2), heat exchange tank (6) and piston cylinder (4) composition, the pipeline (11) being connected with heat exchange tank (5) is divided into two branch roads, after one tunnel series connection two-position valve (1), be connected with work tank (2), another road connects two-position valve (8), the ascending pipe (9) being connected with two-position valve (1) inserts below the middle liquid level of work tank (2), more than the pipeline (10) being connected with two-position valve (1) inserts the middle liquid level of work tank (2), the heat exchanging tube (4) of connecting between heat exchange tank (6) and piston cylinder (5), the outer fan (3) of placing of heat exchanging tube (4), heat exchange tank (6) built-in heat exchanger (7), complete gasification-compression process, inflation process and exhaust process.
Gasification-compression process: two-position valve (1) is in the next, two-position valve (8) is in off state, piston cylinder (5) is in rise, gas in heat exchange tank (6) is compressed, enter the bottom of work tank (2) by connecting pipeline, pressurized gas and liquefied air direct contact heat transfer, the liquefied air gasification of being heated, work tank (2) pressure rise.
Inflation process: two-position valve (1) is in upper, two-position valve (8) is in off state, piston cylinder (5) is in backhaul, the air that gasification produces and pressurized gas mix, and enter heat exchange tank (6) by pipeline, and mixed gas is by heat exchanger (7), carry out abundant heat exchange with the heat exchanging fluid in heat exchange tank (6), temperature rise, gas expansion, the piston that promotes piston cylinder (5) externally does work.
Exhaust process: two-position valve (1) is in the next, two-position valve (8) is in connected state, piston cylinder (5) is in rise, heat exchange tank (6) liquid level rises, gas is discharged by two-position valve (8), gas pressure remains unchanged, and approaches barometric pressure.
Fan: in piston movement process, fan (3) remains starting state, exchange heat pipe (4) heats, and makes heat exchanging fluid temperature stabilization in room temperature, for the heat transfer process in heat exchange tank (6) provides stable origin of heat.
Ascending pipe: inserting work tank (2) end is the porous structure of the multiple geometrical shapies such as circular, square, polygonal.
Claims (6)
1. the hot merit switching mechanism based on the thermodynamic cycle of open-close manifold type, it is characterized in that: by work tank (2), heat exchange tank (6) and piston cylinder (4) composition, the pipeline (11) being connected with heat exchange tank (5) is divided into two branch roads, after one tunnel series connection two-position valve (1), be connected with work tank (2), another road connects two-position valve (8), the ascending pipe (9) being connected with two-position valve (1) inserts below the middle liquid level of work tank (2), more than the pipeline (10) being connected with two-position valve (1) inserts the middle liquid level of work tank (2), the heat exchanging tube (4) of connecting between heat exchange tank (6) and piston cylinder (5), the outer fan (3) of placing of heat exchanging tube (4), heat exchange tank (6) built-in heat exchanger (7), complete gasification-compression process, inflation process and exhaust process.
2. gasification-compression process claimed in claim 1, it is characterized in that: two-position valve (1) is in the next, two-position valve (8) is in off state, piston cylinder (5) is in rise, gas in heat exchange tank (6) is compressed, enters the bottom of work tank (2) by connecting pipeline, pressurized gas and liquefied air direct contact heat transfer, the liquefied air gasification of being heated, work tank (2) pressure rise.
3. inflation process claimed in claim 1, it is characterized in that: two-position valve (1) is in upper, two-position valve (8) is in off state, piston cylinder (5) is in backhaul, the air that gasification produces and pressurized gas mix, enter heat exchange tank (6) by pipeline, mixed gas is by heat exchanger (7), carry out abundant heat exchange with the heat exchanging fluid in heat exchange tank (6), temperature rise, gas expansion, the piston that promotes piston cylinder (5) externally does work.
4. exhaust process claimed in claim 1, it is characterized in that: two-position valve (1) is in the next, two-position valve (8) is in connected state, piston cylinder (5) is in rise, heat exchange tank (6) liquid level rises, gas is discharged by two-position valve (8), and gas pressure remains unchanged, and approaches barometric pressure.
5. fan claimed in claim 1, it is characterized in that: in piston movement process, fan (3) remains starting state, pipeline (4) is heated, make heat exchanging fluid temperature stabilization in room temperature, for the heat transfer process in heat exchange tank (6) provides stable origin of heat.
6. ascending pipe claimed in claim 1, is characterized in that: inserting work tank (2) end is the porous structure of the multiple geometrical shapies such as circular, square, polygonal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410356979.6A CN104179531B (en) | 2014-07-25 | A kind of heat to power output mechanism based on open-close manifold type thermodynamic cycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410356979.6A CN104179531B (en) | 2014-07-25 | A kind of heat to power output mechanism based on open-close manifold type thermodynamic cycle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104179531A true CN104179531A (en) | 2014-12-03 |
| CN104179531B CN104179531B (en) | 2017-01-04 |
Family
ID=
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240235A (en) * | 2017-05-26 | 2018-07-03 | 华北电力大学（保定） | A kind of non-compensation combustion type liquefied air energy-storing and power-generating system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2280845A (en) * | 1938-01-29 | 1942-04-28 | Humphrey F Parker | Air compressor system |
| WO2009126784A2 (en) * | 2008-04-09 | 2009-10-15 | Sustainx, Inc. | Systems and methods for energy storage and recovery using compressed gas |
| CN103370495A (en) * | 2011-01-20 | 2013-10-23 | 光帆能源公司 | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2280845A (en) * | 1938-01-29 | 1942-04-28 | Humphrey F Parker | Air compressor system |
| WO2009126784A2 (en) * | 2008-04-09 | 2009-10-15 | Sustainx, Inc. | Systems and methods for energy storage and recovery using compressed gas |
| CN103370495A (en) * | 2011-01-20 | 2013-10-23 | 光帆能源公司 | Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240235A (en) * | 2017-05-26 | 2018-07-03 | 华北电力大学（保定） | A kind of non-compensation combustion type liquefied air energy-storing and power-generating system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Guo et al. | Thermodynamic characteristics of a novel supercritical compressed air energy storage system | |
| CN110206599B (en) | Combined cooling, heating and power system | |
| CN109026241B (en) | Heat pump compressed air energy storage system | |
| CN102758690B (en) | Efficient high-pressure liquid air energy storage/release system | |
| CN106224041B (en) | A kind of electric heating energy-storage system | |
| CN102758748B (en) | High-pressure liquid air energy storage/release system | |
| CN103016152B (en) | Supercritical air energy storage system with novel process | |
| CN202970911U (en) | Novel-process supercritical air energy storage system | |
| CN102758689B (en) | Ultra-supercritical air energy storage/release system | |
| CN106907203A (en) | The air compressed energy-storage and generating integrated system of wind light mutual complementing | |
| CN207064027U (en) | The air compressed energy-storage and generating integrated system of wind light mutual complementing | |
| CN202811078U (en) | Ultra-supercritical air energy storage/release system | |
| CN208870659U (en) | A kind of heat pump compressed-air energy-storage system | |
| CN103670974B (en) | Recycle the double-action heat and acoustic power generating system of cold energy and heat energy simultaneously | |
| CN105736056B (en) | Liquid air energy storage system | |
| CN105545486A (en) | Power generating system and method of gas turbine | |
| CN112283069B (en) | Light storage combined power station based on non-afterburning type compressed air energy storage | |
| CN104500264B (en) | A kind of open-close formula Stirling heat to power output mechanism | |
| CN202811238U (en) | High-pressure liquid-state air energy storage/release system | |
| CN100427851C (en) | Solar-natural gas combined driven energy-saving air condioner | |
| CN210441302U (en) | Combined cooling, heating and power system | |
| CN202811079U (en) | High-efficiency and high-pressure liquid air energy storage/ release system | |
| CN207299595U (en) | A kind of sun set thermal field and compressed gas energy storage combined operation system | |
| CN106677988B (en) | Wind-solar energy storage system | |
| CN203272071U (en) | System with compressed air and heat storage media storing energy simultaneously |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170104 Termination date: 20190725 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |