CN1297744C - Ocean temperature difference energy and solar energy reheat circulating electric generating method - Google Patents
Ocean temperature difference energy and solar energy reheat circulating electric generating method Download PDFInfo
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- CN1297744C CN1297744C CNB2005100245847A CN200510024584A CN1297744C CN 1297744 C CN1297744 C CN 1297744C CN B2005100245847 A CNB2005100245847 A CN B2005100245847A CN 200510024584 A CN200510024584 A CN 200510024584A CN 1297744 C CN1297744 C CN 1297744C
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- temperature difference
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
Abstract
The present invention relates to a sea temperature difference energy and solar energy reheating circulation energy generation method. Sea water at the sea surface is taken as a preheating source, cold sea water in the deep sea lower than 500 M to 800 M is taken as a cold source, and the solar energy is taken as a main heat source so as to form a closed flow circulation system with a low boiling point working medium. A liquid low boiling point working medium is pressurized by a working medium pump to be conveyed to a preheater, the working medium is preheated by the sea water at the sea surface, and the working medium is heated for a second time by making use of a solar heat collector until reaching the overheat state of working medium gas. Overheated working medium gas enters a turbine to push the turbine to rotate and apply work, and electric power is outputted by a generator set. The working medium which is exhausted out of the turbine is cooled in the liquid state through a condenser by the low temperature sea water at the deep sea again, the pressure of the working medium is increased by the working medium pump, and the working medium is conveyed to the preheater to complete a working medium power circulation process. In the circulation process, the temperature difference of the sea water can be converted into electric power continuously, and thereby, sea temperature difference energy and solar energy reheating circulation energy generation is realized.
Description
Technical field
The present invention relates to a kind of ocean thermal energy-solar energy circulating generation method of reheating, be at traditional enclosed ocean temperature difference power generating system (Ocean Thermal Energy Conversion Closed Cycle, CC-OTEC) on the basis, heat low boiling working fluid once more in conjunction with solar energy, to improve the method for generating efficiency.
Background technique
Ocean thermal energy is meant the energy of the difference of water temperature between sea surface seawater and the deep sea water.Utilize this temperature difference can realize thermodynamic cycle and generating.China South Sea is located on the south north returns, and belongs to tropical climate, and big positive radiation is strong, and surface temperature whole year is more than 25 ℃, and the deep layer water temperature below 500～800 meters is below 5 ℃, and the temperature difference reaches 20 ℃～24 ℃, and the thermal gradient energy resource is richly stored with.
The notion of ocean thermal energy generating be 1881 by French physicist A Songwaer (Jacques Arsened ' Arsonval) proposes.Nineteen thirty Cloud (Claude) utilizes the ocean temperature difference to generate electricity successfully first, has confirmed its feasibility.
Open type and two kinds of circulatory systems of enclosed are mainly adopted in ocean thermal energy conversion. is in closed cycle; In heat exchanger (evaporimeter), heat passed to earlier the low boiling working fluids such as propane, ammonia from the warm seawater of sea surface; Make it evaporation; The working medium evaporation becomes steam pushing turbine expansion acting; The working medium that steam turbine is discharged enters condenser again; Again become liquid state after the deep layer Mare Frigoris water cooling that is drawn up by water supply pump; With working medium pump the liquid refrigerant in the condenser is compressed into evaporimeter again; For recycling (Yan Xiwen; Solar heat collector---the ocean thermal energy brief analysis of maximum on the earth; The New Energy Sources In China netHttp:// www.newenergy.com.cn/).
Studies show that because the cold and hot temperature of seawater is more or less the same, traditional ocean temperature difference power generating system efficient is extremely low.If with the ammonia is cycle fluid, is 25 ℃ in the seawater surface temperature, when the deep layer temperature was 5 ℃, the efficient of desirable Rankine cycle (Rankin Cycle) only had an appointment 1.74%.Because the actual cycle process also comprises the loss of each parts, the electric power that circulation is sent also is not enough to provide keeps the systemic circulation energy needed, makes that traditional ocean temperature difference power generating system is difficult to be applied all the time.
Solar energy is primary energy, is again renewable energy sources.The same with ocean thermal energy, its aboundresources both can freely use, and need not transportation again, and environment is not had any pollution.Sun mean radiation intensity can reach 210～250W/m in the torrid areas
2Combine with ocean thermal energy, form new circulation system, can realize the comprehensive exploitation and the utilization of the energy.Do not see that at present the research document of relevant this respect openly reports.
Summary of the invention
The objective of the invention is to traditional enclosed ocean power generation system is improved, propose a kind of novel ocean thermal energy-solar energy circulating generation method of reheating, improve the cycle fluid cold ﹠ heat source temperature difference, thereby improve systemic circulation efficient, promote its practicability.
For realizing such purpose, the present invention is as pre-thermal source with the seawater of about 25 ℃ of ocean surfaces, as low-temperature receiver, as main heat source, make up a low boiling working fluid enclosed flow circuit system with bathypelagic 5 ℃ of left and right sides Mare Frigoris water below 500～800 meters with solar energy.Wherein, solar energy can improve 20～50 ℃ with the temperature of thermal source.Liquid 7～12 ℃ low boiling working fluid improves pressure by working medium pump in the cyclic process, be transported in the preheater, after by the sea surface seawater working medium being preheated, utilize solar thermal collector that working medium is carried out double heating again, until reaching the Working medium gas superheat state, overheated Working medium gas enters turbine, promotes turbine rotation acting, by generator set electric power is exported.The working medium of discharging from turbine is the gas of 7～12 ℃ of nearly saturation state, is cooled to liquid condition by the bathypelagic low temperature seawater by condenser again, improves its pressure by working medium pump and sends into preheater, finishes the working medium power cycle.In this cyclic process, can be constantly the temperature difference of seawater be become electric power, realize ocean thermal energy-solar energy circulating generation of reheating thus.
Method of the present invention can adopt following steps to realize:
1. about 7～12 ℃ of saturated liquid refrigerants are sent in the preheater by the working medium pump pressurization.Power pressure is 30～50 ℃ of pairing evaporating pressures of working medium in the preheater.
2. working medium is heated to more than 20 ℃ by the seawater of about 25 ℃ of ocean surfaces in preheater, still keeps liquid.
3. the liquid refrigerant that flows out from preheater enters solar thermal collector, further is heated.The heating of liquid heating-up zone, two-phase heating-up zone and the overheated zone of process solar thermal collector becomes 60～80 ℃ overheated gas.
Power pressure still is its 30～50 ℃ of pairing evaporating pressures in the solar thermal collector.
In order to improve the working medium temperature, need to adopt solar concentrating collector that working medium is further overheated.Solar thermal collector can adopt solar concentrating collector, is the heat-pipe heat exchanger form.
4. the Working medium gas that flows out from solar thermal collector enters steam turbine, promotes turbine acting output power, and this power can be converted into electric power output or directly output by generator.
Be still overheated gas through working medium behind the steam turbine, the evaporating pressure of correspondence when pressure is reduced to 7～12 ℃, temperature also is reduced to below 15 ℃ simultaneously.
5. the gaseous working medium of being discharged by steam turbine enters in the condenser, is condensed into 7～12 ℃ saturated solution by the bathypelagic seawater.
About about 5 ℃ of bathypelagic seawater is taken from the sea level below 500～800 meters.Bathypelagic Mare Frigoris hydromining extracts more than the sea level through the thermoinsulation material pipeline with sea water pump.
According to law of connected vessels, the pump merit that sea water pump consumed is just in order to keep flow required kinetic energy and overcome frictional loss of deep sea water in pipeline.
6. the working medium that flows out from condenser is sent into the preheater by the working medium pump pressurization, thereby finishes cyclic process, realizes the electric power output of system.
The needed electric power of whole circulation process can be provided by system self fully, and additional power output is arranged, so can realize the generating of system.
Method of the present invention recycling by to ocean thermal energy and solar energy not only effectively improved generating efficiency, also makes full use of rich natural resource, and the clear energy sources that is adopted can not pollute environment, has wide potential application prospect.
Description of drawings
Fig. 1 is ocean thermal energy-solar energy of the present invention circulating generation method flow diagram of reheating.
Embodiment
Ocean thermal energy-solar energy of the present invention is reheated the circulating generation method flow as shown in Figure 1, and related system is made up of parts such as steam turbine, generator, solar thermal collector, preheater, condenser, working medium pump, sea water pump and the pipeline that connects between each parts.
According to the cycle generating system requirement of reheating of ocean thermal energy-solar energy, should select for use at gas phase zone specific heat big, and the smaller working medium of the latent heat of vaporization.Like this, can reduce the size and the heat exchange quantity of preheater, solar thermal collector and condenser.
Below be example with ammonia working medium, adopting the circuit evaporating temperature is 50 ℃, evaporating pressure is 20.3bar, condensing temperature is 10 ℃, condensing pressure is 6.15bar, and circulation process is described.The related parameter of embodiment is not construed as limiting the present invention.
1.10 the ammonia saturated solution about ℃ improves pressure to sending in the preheater more than the 20.3bar by ammonia pump.
2. liquefied ammonia can be heated to more than 20 ℃ by the seawater of about 25 ℃ of ocean surfaces in preheater.
3. the liquefied ammonia more than 20 ℃ that flows out from preheater enters solar thermal collector, further is heated.Under the pressure of about 20.3bar through pervaporation, overheated.Adopt solar concentrating collector ammonia can be superheated to 80 ℃.
4. flow out from solar thermal collector about 80 ℃, the overheated ammonia of 20.3bar enter steam turbine, promote turbine rotation acting and output power, and this power can be converted into electric power output by generator.
Pressure through ammonia behind the steam turbine is reduced to about 6.15bar, and ideally, temperature can be reduced to 10 ℃, becomes wet vapor.
5. the wet vapor of being discharged by steam turbine enters condenser and is taken from the ammoniacal liquor that the seawater of about 500 meters 5 ℃ of bathypelagics is condensed into 10 ℃.
6. flow out ammoniacal liquor from condenser and send into the preheater, thereby finish cyclic process, realize the electric power output of system by ammonia pump.
The efficient of the desirable Rankine cycle of this system can reach 11.9%.Compare with the nothing circulation of reheating, can significantly improve cycle efficiency after adopting the solar energy double heating.Consider the loss and the line loss of each parts in the actual cycle, be in steam turbine, sea water pump and working medium pump efficient under 60% the situation that the generating efficiency of this method can reach 3.3%, thereby has improved the practicability of whole system.
Claims (2)
1, a kind of ocean temperature difference energy and solar energy reheat circulating electric generating method is characterized in that comprising the steps:
1) 7～12 ℃ of saturated liquid refrigerants are sent in the preheater by the working medium pump pressurization, and power pressure is 30～50 ℃ of pairing evaporating pressures of working medium in the preheater;
2) working medium is heated to more than 20 ℃ by the ocean surface seawater in preheater, still keeps liquid;
3) liquid refrigerant that flows out from preheater enters solar thermal collector, further heating through liquid heating-up zone, two-phase heating-up zone and the overheated zone of solar thermal collector, become 60～80 ℃ overheated gas, power pressure still is its 30～50 ℃ of pairing evaporating pressures in the solar thermal collector;
4) Working medium gas that flows out from solar thermal collector enters steam turbine, promotes turbine acting output power, and this power is converted into electric power output or directly output by generator; Through working medium behind the steam turbine still is overheated gas, the evaporating pressure of correspondence when pressure is reduced to 7～12 ℃, and temperature also is reduced to below 15 ℃ simultaneously;
5) gaseous working medium of being discharged by steam turbine enters in the condenser, is condensed into 7～12 ℃ saturated solution by the bathypelagic seawater; Wherein the bathypelagic seawater is taken from the sea level below 500～800 meters, adopts sea water pump to extract more than the sea level through the thermoinsulation material pipeline;
6) working medium that flows out from condenser is sent into the preheater by the working medium pump pressurization, thereby finishes cyclic process, realizes the electric power output of system.
2,, it is characterized in that described solar thermal collector is a solar concentrating collector, is the heat-pipe heat exchanger form according to the ocean temperature difference energy and solar energy reheat circulating electric generating method of claim 1.
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| CNB2005100245847A CN1297744C (en) | 2005-03-24 | 2005-03-24 | Ocean temperature difference energy and solar energy reheat circulating electric generating method |
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| CNB2005100245847A CN1297744C (en) | 2005-03-24 | 2005-03-24 | Ocean temperature difference energy and solar energy reheat circulating electric generating method |
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| CN1297744C true CN1297744C (en) | 2007-01-31 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009124456A1 (en) * | 2008-04-09 | 2009-10-15 | Gan Yuxiang | Method and device for generating power by using temperature difference of sea water |
| CN101737282B (en) * | 2008-11-05 | 2012-05-23 | 上海海事大学 | High-efficiency hybrid ocean temperature difference power generating system |
| CN103104995A (en) * | 2011-11-14 | 2013-05-15 | 北京兆阳能源技术有限公司 | Novel solar thermal collector |
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| CN1312380C (en) * | 2005-10-27 | 2007-04-25 | 上海交通大学 | Strong curved wing section of sea temperature difference energy-solar energy reboil circulation power generating steam turbine |
| CN101377348B (en) * | 2007-08-28 | 2011-07-27 | 梁柏堂 | Solar energy comprehensive utilization system |
| CN101397982A (en) * | 2007-09-27 | 2009-04-01 | 游图明 | Solar power generation method and device |
| CN101397983B (en) * | 2007-09-30 | 2012-09-05 | 王作国 | Working fluid phase changing enthalpy difference sea water temperature difference power machine |
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| US8991182B2 (en) | 2009-02-17 | 2015-03-31 | Mcalister Technologies, Llc | Increasing the efficiency of supplemented ocean thermal energy conversion (SOTEC) systems |
| DE102009056707A1 (en) | 2009-04-18 | 2010-10-21 | Alstom Technology Ltd. | Steam power plant with solar collectors |
| EP2470752A4 (en) * | 2009-08-27 | 2015-08-05 | Mcalister Technologies Llc | Energy conversion assemblies and associated methods of use and manufacture |
| EP2526296B1 (en) | 2010-01-21 | 2023-06-07 | The Abell Foundation Inc. | Ocean thermal energy conversion power plant |
| CN101936274A (en) * | 2010-08-06 | 2011-01-05 | 绍兴文理学院 | Thermal power generation system based on gas turbine circulation in solar energy regeneration reheating inter-cooling |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009124456A1 (en) * | 2008-04-09 | 2009-10-15 | Gan Yuxiang | Method and device for generating power by using temperature difference of sea water |
| CN101737282B (en) * | 2008-11-05 | 2012-05-23 | 上海海事大学 | High-efficiency hybrid ocean temperature difference power generating system |
| CN103104995A (en) * | 2011-11-14 | 2013-05-15 | 北京兆阳能源技术有限公司 | Novel solar thermal collector |
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