CN103511207A - Heat accumulation and exchange integrated tower-type solar power generation system - Google Patents
Heat accumulation and exchange integrated tower-type solar power generation system Download PDFInfo
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- CN103511207A CN103511207A CN201310419565.9A CN201310419565A CN103511207A CN 103511207 A CN103511207 A CN 103511207A CN 201310419565 A CN201310419565 A CN 201310419565A CN 103511207 A CN103511207 A CN 103511207A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a heat accumulation and exchange integrated tower-type solar power generation system which comprises a heliostat field, a saturated water heat absorber, a water heat accumulator, a superheated heat absorber, a heat accumulation/heat exchange device, a steam turbine, a generator set, a condenser, a condensate pump, a deaerator, a water feed pump and a plurality of block valves. The first block valve is arranged between the saturated water heat absorber and the water heat accumulator, the second block valve is arranged between the water heat accumulator and the superheated heat absorber, the third block valve is arranged between the superheated heat absorber and the heat accumulation/heat exchange device, and the fourth block valve is arranged between the water heat accumulator and the heat accumulation/heat exchange device. Under the state that solar rays are sufficient, the first block valve, the second block valve and the third block valve are opened, the fourth block valve is closed, superheated steam is buffered through the heat accumulation/heat exchange device, and heat is accumulated through the heat accumulation/heat exchange device. Under the state that the solar rays are insufficient, the first block valve, the second block valve and the third block valve are closed, the fourth block valve is opened, and heat exchange is carried out on saturated steam through the heat accumulation/heat exchange device to form the superheated steam.
Description
Technical field
The present invention relates to technical field of solar, particularly the integrated tower type solar power generation system of a kind of regenerative heat exchange.
Background technique
Solar energy heat build-up generation technology is developed so far the history that had three more than ten years; it is different from solar energy power generating; also be different from the direct photothermal power generation that utilizes stirling generator; it is the important research direction that solar energy utilizes, and the problems such as fossil energy crisis, atmospheric pollution that the mankind are solved have profound significance.Solar energy high temperature heat generating has multiple technologies direction: according to the difference of the type of focusing, can be divided into dish formula, slot type, the mode such as tower; The working medium adopting has water (steam), fused salt, air, conduction oil, liquid metal and other heat-conducting mediums etc.
The solar heat power generation system of tower type focusing, by the transmitting effect of its scale Jing Chang, by large-area solar light focusing above the heat absorber of small size very, the focusing multiple on heat absorber surface can reach 500～1000 times conventionally, thereby there is higher light utilization ratio, in recent years, receive the concern of world many countries.The tower-type solar thermal power generating system that the water of take is working medium has the features such as low price, good effect of heat exchange, control be simple, so the research of the type is applied at first on solar energy tower type thermal generation.But device of working medium does not almost have heat storage capacity, when intensity of solar radiation declines, the cloud layer short time blocks heliostat field, causes endothermic system cannot produce qualified Steam Actuation steam turbine and works on.Conventional way is to utilize fossil-fuel boiler to heat the method that produces superheated vapor at present, and its defect is: both cannot respond in time, and not meet again the original intention that reduces carbon emission, reduces environmental pollution.And if leave out of account, steam turbine frequent start-stop in the middle of a day, has both shortened working life of steam turbine greatly, has also affected generated energy, both uneconomical, also because output load fluctuation impacts electrical network.
When therefore, solution Jing Chang generation cloud layer blocks, continuing to produce qualified Steam Actuation steam turbine stable operation is a difficult problem.
Summary of the invention
The present invention is directed to prior art above shortcomings; provide a kind of regenerative heat exchange integrated tower type solar power generation system; utilize the heat storage capacity of heat storage medium; during heliostat field generation cloud layer blocks; continue to produce superheated vapor and maintain steam turbine running; reduced halt turbines number of times, improved the while in working life of steam turbine and also improved economic benefit.
The present invention is achieved through the following technical solutions:
An integrated tower type solar power generation system, is characterized in that, comprising:
Heliostat field, in order to sunlight reflection;
Saturation water heat absorber, absorbs the solar beam of heliostat field reflection, take that to heat its inner water be saturated vapour;
Water thermal accumulator, the input end of water thermal accumulator connects the output terminal of saturation water heat absorber, in order to cushion saturated vapour;
Overheating heat accumulator, the input end of overheating heat accumulator connects the output terminal of water thermal accumulator, receives the saturated vapour cushioning, and absorbs the solar beam of heliostat field reflection, and the saturated vapour cushioning is heated to be to superheated vapor;
Accumulation of heat/heat exchanger, the input end of accumulation of heat/heat exchanger connects the output terminal of water thermal accumulator and the output terminal of overheating heat accumulator, in order to cushion superheated vapor, and accumulation of heat/heat exchange;
Steam power generating equipment, connects accumulation of heat/heat exchanger, by the superheated vapor generating of doing work;
Vapour condenser, the input end of vapour condenser connects steam power generating equipment, the steam condensation Cheng Shui that acting has been generated electricity;
Oxygen-eliminating device, the input end of oxygen-eliminating device connects the output terminal of vapour condenser, the output terminal of oxygen-eliminating device connects the input end of saturation water heat absorber, in order to remove oxygen in water and by water circulation to saturation water heat absorber;
Wherein, between the saturation water heat absorption output terminal of gas and the input end of water thermal accumulator, be provided with one first block valve, between the output terminal of water thermal accumulator and the input end of overheating heat accumulator, be provided with one second block valve, between the output terminal of overheating heat accumulator and the input end of accumulation of heat/heat exchanger, be provided with one the 3rd block valve, between the output terminal of water thermal accumulator and the input end of accumulation of heat/heat exchanger, be provided with one the 4th block valve;
Under the state of solar beam abundance, the first block valve, the second block valve, the 3rd block valve are opened, and the 4th block valve is closed, and the superheated vapor that accumulation of heat/heat exchanger produces overheating heat accumulator cushions and accumulation of heat; Under the insufficient state of solar beam, the first block valve, the second block valve, the 3rd block valve are closed, and the 4th block valve is opened, and the saturated vapour that accumulation of heat/heat exchanger produces water thermal accumulator carries out heat exchange, to form superheated vapor.
Preferably, the heat storage medium in accumulation of heat/heat exchanger is fused salt or graphite.
Preferably, also comprise a condensate pump, be connected between the output terminal of vapour condenser and the input end of oxygen-eliminating device, in order to carry the water after condensing.
Preferably, also comprise a feed water pump, be connected between the output terminal of oxygen-eliminating device and the input end of saturation water heat absorber, in order to carry the water after deoxygenation.
Preferably, steam power generating equipment comprises steam turbine and generator set, and steam turbine connects the output terminal of accumulation of heat/heat exchanger and the input end of vapour condenser, and generator set connects steam turbine.
Beneficial effect of the present invention is:
1, the present invention is on the basis of device of working medium tower-type solar thermal power generating system; increased heat accumulation function; when solar radiation is poor or cloud layer blocks reason and causes saturation water heat absorber cannot produce enough saturated vapours; and when superheater cannot produce enough superheated vapors; the heat of regenerative system storage can maintain steam turbine and continue generating; reduce halt turbines number of times, increased effective generating dutation.
2, the present invention's tower of having avoided absorbing heat on the heat storage medium in accumulation of heat/heat-exchange system, and system equipment compact structure, shortens the duct length because of the upper and lower tower of heat storage medium, greatly reduces the system safety hazards causing in course of conveying, has reduced construction cost simultaneously.
3, the present invention because of heat storage medium use amount few, without Large scale construction regenerative system, generally, cloud layer block can be in a few minutes to half an hour, therefore, only need the regenerative system of design half an hour to one hour to deal with problems, cost of investment is low.
Accompanying drawing explanation
Shown in Fig. 1 is the structural representation of first embodiment of the invention;
Shown in Fig. 2 is the structural representation of second embodiment of the invention.
Embodiment
Below with reference to accompanying drawing of the present invention; technological scheme in the embodiment of the present invention is carried out to clear, complete description and discussion; obviously; as described herein is only a part of example of the present invention; it is not whole examples; embodiment based in the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work, belongs to protection scope of the present invention.
For the ease of the understanding to the embodiment of the present invention, below in conjunction with accompanying drawing, take specific embodiment and be further explained as example, and each embodiment does not form the restriction to the embodiment of the present invention.
As shown in Figure 1 and Figure 2, tower type solar solar-thermal generating system provided by the present invention comprises: heliostat field 11, saturation water heat absorber 1, water thermal accumulator 2, overheated heat absorber 3, accumulation of heat/heat exchanger 4, steam turbine 5, generator set 6, vapour condenser 7, condensate pump 8, oxygen-eliminating device 9, feed water pump 10, some block valves.Wherein, between saturation water heat absorber 1 and water thermal accumulator 2, be provided with a block valve 100, between water thermal accumulator 2 and overheated heat absorber 3, be provided with a block valve 101, be provided with a block valve 102 between overheated heat absorber 3 and accumulation of heat/heat exchanger 4, overheated heat absorber 3 is also provided with a bypass block valve 103.Wherein, the heat storage medium in accumulation of heat/heat exchanger 4 can be fused salt (as shown in Figure 1) or graphite (as shown in Figure 2).
When sunlight is sufficient, the flow process of this system is that heliostat field 11 projects sunlight respectively saturation water heat absorber 1 and overheated heat absorber 3, saturation water heat absorber 1 is heated into saturated vapour by the feedwater of oxygen-eliminating device 9, after cushioning by water thermal accumulator 2, enter and be hot heat absorber 3, overheated heat absorber 3 becomes saturated vapour into superheated vapor, after enter after accumulation of heat/heat exchanger 4 cushions and become stable superheated vapor, stable superheated vapor enters steam turbine 5 and drives generator set 6 generatings.The steam that completes acting in steam turbine 5 enters vapour condenser 7 and condenses into water, after by condensate pump 8, deliver into oxygen-eliminating device 9, then enter saturation water heat absorber 1 through feed water pump 10.Wherein, between saturation water heat absorber 1 and water thermal accumulator 2, be provided with a block valve 100, between water thermal accumulator 2 and overheated heat absorber 3, be provided with a block valve 101, be provided with a block valve 102 between overheated heat absorber 3 and accumulation of heat/heat exchanger 4, overheated heat absorber 3 is also provided with a bypass block valve 103.
When if cloud layer appears in heliostat field 11 tops, DNI(beam radia) data sharply decline, and saturation water heat absorber 1 cannot produce enough saturated vapours, and overheated heat absorber 3 also correspondingly cannot produce enough superheated vapors and carry out pushing turbine 5 runnings.Now, this system need to be closed the block valve 102 between block valve 101, overheated heat absorber 3 and the accumulation of heat/heat exchanger 4 between block valve 100, water thermal accumulator 2 and the overheated heat absorber 3 between saturation water heat absorber 1 and water thermal accumulator 2, open the bypass block valve 103 of overheated heat absorber 3 simultaneously, the saturation water that water thermal accumulator is 2 li produces saturated vapour by flash distillation, enter accumulation of heat/heat exchanger 4 and carry out heat exchange, after formation superheated vapor, enter steam turbine 5 and drive generator set 6 generatings.Carrying out along with flash process, temperature and pressure in water thermal accumulator 2 all can slow decreasing, and the saturated vapour temperature and pressure of generation is slow decreasing accordingly also, therefore, in this process, steam turbine 5 is in sliding pressure operation process, thereby maintains steam turbine 5 runnings.
When heliostat field cloud layer blocks after disappearance, the superheated vapor that overheated heat absorber 3 produces is again the accumulation of heat/heat exchanger 4 that blocks before time institute's heat release temperature reduction because of cloud layer, make heat storage medium in accumulation of heat/heat exchanger 4 be heated to the target temperature of the condition of high temperature, use when cloud layer blocks next time.
Key of the present invention is the design to accumulation of heat/heat exchanger 4, and accumulation of heat and heat exchange adopt same set of heat exchanger, realizes the integrated object of tower type solar photothermal power generation regenerative heat exchange.Adopt two cover heat exchangers different from conventional accumulation of heat and heat release, this system has been simplified heat exchange and accumulation of heat structure greatly, has reduced equipment investment cost.Key of the present invention is also, owing to having adopted regenerative heat exchange integrated design, heat storage medium only circulates in accumulation of heat/heat exchanger 4 subranges, there is no the remote conveying of heat storage medium, has greatly reduced the security risk that exists in heat storage medium course of conveying (as solidify, leakage etc.).In addition, because heat-storage medium major function in native system is blocked for tackling heliostat field cloud layer, and cloud layer blocks common can disappearance within a short period of time, therefore, without adopting a large amount of heat storage mediums, has effectively controlled cost of investment.
When the heat storage medium in accumulation of heat/heat exchanger 4 is fused salt, in set flow rates, the convection transfer rate that the convection transfer rate of fused salt side is surveyed much larger than steam, therefore, can be by regulating the flow velocity of molten salt circulating pump (not shown) to control the Composite Walls in accumulation of heat and exothermic process, to reach the dual purpose of heat absorption and release simultaneously.
When the heat storage medium in accumulation of heat/heat exchanger 4 is graphite, because graphite is non-current solid, the heat transfer of graphite and steam is mainly undertaken by transmission of heat by contact, graphite has good heat-conducting property, therefore, in diabatic process, maintain vapor phase to constant mass velocity under, add thermogenetic superheated vapor and can maintain a relatively constant degree of superheat, meet steam turbine requirement to steam superheat in sliding pressure operation.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (5)
1. the integrated tower type solar power generation system of regenerative heat exchange, is characterized in that, comprising:
Heliostat field, in order to sunlight reflection;
Saturation water heat absorber, absorbs the solar beam of described heliostat field reflection, take that to heat its inner water be saturated vapour;
Water thermal accumulator, the input end of described water thermal accumulator connects the output terminal of described saturation water heat absorber, in order to cushion described saturated vapour;
Overheating heat accumulator, the input end of described overheating heat accumulator connects the output terminal of described water thermal accumulator, receives the saturated vapour cushioning, and absorbs the solar beam of described heliostat field reflection, and the saturated vapour that described buffering is crossed is heated to be superheated vapor;
Accumulation of heat/heat exchanger, the input end of described accumulation of heat/heat exchanger connects the output terminal of described water thermal accumulator and the output terminal of described overheating heat accumulator, in order to cushion described superheated vapor, and accumulation of heat/heat exchange;
Steam power generating equipment, connects described accumulation of heat/heat exchanger, by the generating of doing work of described superheated vapor;
Vapour condenser, the input end of described vapour condenser connects described steam power generating equipment, the steam condensation Cheng Shui that acting has been generated electricity;
Oxygen-eliminating device, the input end of described oxygen-eliminating device connects the output terminal of described vapour condenser, the output terminal of described oxygen-eliminating device connects the input end of described saturation water heat absorber, in order to remove oxygen in water and by water circulation to described saturation water heat absorber;
Wherein, between the described saturation water heat absorption output terminal of gas and the input end of described water thermal accumulator, be provided with one first block valve, between the output terminal of described water thermal accumulator and the input end of described overheating heat accumulator, be provided with one second block valve, between the output terminal of described overheating heat accumulator and the input end of described accumulation of heat/heat exchanger, be provided with one the 3rd block valve, between the output terminal of described water thermal accumulator and the input end of described accumulation of heat/heat exchanger, be provided with one the 4th block valve;
Under the state of solar beam abundance, described the first block valve, the second block valve, the 3rd block valve are opened, and described the 4th block valve is closed, and the described superheated vapor that described accumulation of heat/heat exchanger produces described overheating heat accumulator cushions and accumulation of heat; Under the insufficient state of solar beam, described the first block valve, the second block valve, the 3rd block valve are closed, and described the 4th block valve is opened, and the described saturated vapour that described accumulation of heat/heat exchanger produces described water thermal accumulator carries out heat exchange, to form superheated vapor.
2. the integrated tower type solar power generation system of regenerative heat exchange according to claim 1, is characterized in that, the heat storage medium in described accumulation of heat/heat exchanger is fused salt or graphite.
3. the integrated tower type solar power generation system of regenerative heat exchange according to claim 1, is characterized in that, also comprises a condensate pump, is connected between the output terminal of described vapour condenser and the input end of described oxygen-eliminating device, in order to carry the water after condensing.
4. the integrated tower type solar power generation system of regenerative heat exchange according to claim 1, is characterized in that, also comprises a feed water pump, is connected between the output terminal of described oxygen-eliminating device and the input end of described saturation water heat absorber, in order to carry the water after deoxygenation.
5. the integrated tower type solar power generation system of regenerative heat exchange according to claim 1, it is characterized in that, described steam power generating equipment comprises steam turbine and generator set, described steam turbine connects the output terminal of described accumulation of heat/heat exchanger and the input end of described vapour condenser, and described generator set connects described steam turbine.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132570A (en) * | 2014-08-14 | 2014-11-05 | 河南骏化发展股份有限公司 | Emission-free and pollution-free liquid heat energy storage and utilization method and device |
| CN107061201A (en) * | 2016-12-23 | 2017-08-18 | 华北电力大学 | A kind of photovoltaic and photothermal coupling co-generation unit and method |
| CN114322334A (en) * | 2021-11-29 | 2022-04-12 | 郑州大学 | Tower type solar heat collection steam heating system |
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| JPS60122865A (en) * | 1983-12-07 | 1985-07-01 | Hitachi Ltd | Solar heat electric power generation apparatus |
| DE102007013430A1 (en) * | 2007-03-13 | 2008-09-18 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Solar thermal power plant, has focal line collectors connected in series and parallel with respect to guiding direction of medium, where collectors exhibit different geographical orientation in their longitudinal direction |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132570A (en) * | 2014-08-14 | 2014-11-05 | 河南骏化发展股份有限公司 | Emission-free and pollution-free liquid heat energy storage and utilization method and device |
| CN107061201A (en) * | 2016-12-23 | 2017-08-18 | 华北电力大学 | A kind of photovoltaic and photothermal coupling co-generation unit and method |
| CN114322334A (en) * | 2021-11-29 | 2022-04-12 | 郑州大学 | Tower type solar heat collection steam heating system |
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