CN103742373A - Tower solar thermal power plant utilizing supercritical water heat absorber and molten salt heat storage - Google Patents
Tower solar thermal power plant utilizing supercritical water heat absorber and molten salt heat storage Download PDFInfo
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- CN103742373A CN103742373A CN201310725560.9A CN201310725560A CN103742373A CN 103742373 A CN103742373 A CN 103742373A CN 201310725560 A CN201310725560 A CN 201310725560A CN 103742373 A CN103742373 A CN 103742373A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 247
- 150000003839 salts Chemical class 0.000 title claims abstract description 182
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 74
- 238000005338 heat storage Methods 0.000 title abstract description 13
- 238000010248 power generation Methods 0.000 claims abstract description 32
- 230000005855 radiation Effects 0.000 claims abstract description 17
- 230000001172 regenerating effect Effects 0.000 claims description 38
- 230000005494 condensation Effects 0.000 claims description 27
- 238000009833 condensation Methods 0.000 claims description 27
- 238000006392 deoxygenation reaction Methods 0.000 claims description 18
- 238000009825 accumulation Methods 0.000 claims description 17
- 238000011161 development Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 8
- 230000003020 moisturizing effect Effects 0.000 claims description 5
- 238000004146 energy storage Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000012546 transfer Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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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
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Abstract
The invention provides a tower solar thermal power plant utilizing a supercritical water heat absorber and molten salt heat storage. The tower solar thermal power plant comprises a condensate pump, a deaerator, a water supply pump, the supercritical water heat absorber, a molten salt heat storage system, a steam turbine, a power generator and a condenser; the molten salt heat storage system comprises a water and molten salt heat exchanger, an expanding device, a cold salt tank, a hot salt tank, a cold salt pump, a hot salt pump and a molten salt and water heat exchanger; the condensate water is heated through the deaerator and input into the supercritical water heat absorber through the water supply pump, the solar radiation is absorbed, and the deaerated water is converted into the supercritical water to enter into the steam turbine to for work applying and power generation. The tower solar thermal power plant is combined with the work applying and power generation of the supercritical water and the molten salt heat storage and accordingly the tower solar thermal power plant can be suitable for various solar radiation conditions and the thermoelectric conversion efficiency is high; the work applying of the supercritical water is high in efficiency and free of phase change and accordingly the high thermoelectric efficiency can be guaranteed through a simple single-stage heat storage system; meanwhile the risk that the molten salt is solidified in the upper tower process is voided in comparison with a molten salt heat absorber.
Description
Technical field
The present invention relates to tower type solar energy thermal power generation technical field, particularly a kind of tower type solar energy thermal power generation station that adopts supercritical water heat absorber and fused salt accumulation of heat.
Background technique
The hot generation technology of solar energy high temperature is the important directions that solar energy scale is utilized, and the problems such as fossil energy crisis, empty contaminated vapor 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 (water vapor), fused salt, empty vapour, conduction oil, liquid metal and other heat-conducting mediums etc.
The solar light-heat power-generation system of tower type focusing, focuses on multiple and conventionally can reach 500～1000 times, thereby has the advantages such as large capacity, high parameter, is in recent years receiving the concern of world many countries.Tower-type solar thermal power generating system take water as working medium has the features such as low price, good effect of heat exchange, control be simple, and therefore 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, cannot when night and bad weather, generate electricity, and it is very large affected by cloudy day, black clouds etc.And fused salt has features such as thermal capacitance is high, liquidus temperature wide ranges, good fluidity are more and more subject to various countries scholar's attention to its research as heat-carrying agent.The fused salt intensification of absorbing heat in heat absorber, then produces the steam of the parameter that power station needs by steam raising plant.
But the solidifying point of fused salt is very high, if upper tower enters heat absorber, be very easy to solidify plugging, to pipeline preheating, insulation of equipment, operation maintenance etc., require also stricter.The present invention wishes the advantage in conjunction with water and fused salt, avoids system to become too complicated in the situation that guaranteeing and improve thermoelectrical efficiency as far as possible.
The accumulation of heat of water heat absorber fused salt, under the pattern of traditional water-evaporation-overheated, because the saturation temperature of water vapor is limited and superheat section energy is less, so fused salt cannot be heated to higher temperature in heat exchange during to fused salt, unless use multistage heat-stored device, otherwise the fire of regenerative system is very large with loss.
Summary of the invention
The present invention is a kind of tower type solar energy thermal power generation station that adopts supercritical water heat absorber and fused salt accumulation of heat, comprise the oxygen-eliminating device, feed water pump, supercritical water heat absorber, steam turbine, vapour condenser and the condensate pump that are connected successively and form the first power generation circuit, described steam turbine is connected with a generator; Input end at described oxygen-eliminating device under original state carries out moisturizing, water is after described oxygen-eliminating device deoxygenation, by described feed water pump, flow to the described supercritical water heat absorber being arranged on control tower, described supercritical water heat absorber absorbs solar energy the water after deoxygenation is transformed into supercritical water output, described supercritical water enters described steam turbine and drives described generator acting generating, after described supercritical water heat release acting, in described vapour condenser, be again condensed into water of condensation, under the effect of described condensate pump, again enter in described oxygen-eliminating device.
Preferably, described tower type solar power station also comprises fused salt regenerative system, and described fused salt regenerative system is connected in parallel on the loop between described supercritical water heat absorber and described steam turbine; Described fused salt regenerative system is connected with the input end of described oxygen-eliminating device, and described oxygen-eliminating device, feed water pump, supercritical water heat absorber and described fused salt regenerative system form an energy storage work loop; Described fused salt regenerative system is also connected with described feedwater delivery side of pump, and described oxygen-eliminating device, feed water pump, fused salt regenerative system, steam turbine, vapour condenser and condensate pump form the second power generation circuit.
Preferably, described fused salt regenerative system comprises water-fused salt heat exchanging device, development unit, cold salt cellar, cold salt pump, hot salt cellar, hot salt pump, fused salt-water-to-water heat exchanger;
The two ends of described water-fused salt heat exchanging device connect respectively one end of described hot salt cellar and described cold salt cellar, and described water-fused salt heat exchanging device is also connected with the output terminal of described supercritical water heat absorber with the connecting end of described hot salt cellar, described water-fused salt heat exchanging device is also connected with the input end of described oxygen-eliminating device by described development unit with the connecting end of described cold salt cellar;
The two ends of described fused salt-water-to-water heat exchanger connect respectively the other end of described hot salt cellar and described cold salt cellar, and described fused salt-water-to-water heat exchanger is also connected with the input end of described steam turbine with the connecting end of described hot salt cellar, described fused salt-water-to-water heat exchanger is also connected with described feedwater delivery side of pump with the connecting end of described cold salt cellar.
Preferably, between described water-fused salt heat exchanging device and described cold salt cellar, be provided with cold salt pump, between described hot salt cellar and described fused salt-water-to-water heat exchanger, be provided with hot salt pump.
Preferably, between described feedwater delivery side of pump and the input end of described supercritical water heat absorber, be provided with a main feed-regulating valve, between described feedwater delivery side of pump and the input end of described fused salt-water-to-water heat exchanger, be provided with a secondary feed-regulating valve, the output terminal of described supercritical water heat absorber and the input end of described steam turbine are provided with a main steam control valve, the input end of the output terminal of described supercritical water heat absorber and described water-fused salt heat exchanging device is provided with a steam inlet stop valve, the output terminal of described fused salt-water-to-water heat exchanger and the input end of steam turbine are provided with a steam (vapor) outlet modulating valve.
Preferably, the output terminal of described development unit is provided with a heat output channel, for to other heating equipment heat supplies.
Preferably, when solar radiation is better, open described main feed-regulating valve, described main steam control valve and described steam inlet stop valve, close described secondary feed-regulating valve and described steam (vapor) outlet modulating valve; Described condensate pump is sent water of condensation into described oxygen-eliminating device, and the water after deoxygenation enters described supercritical water heat absorber after described feed water pump, and under the effect of solar radiation, heating produces supercritical water; Part supercritical water enters described steam turbine and drives described generator acting, after heat release acting, is again condensed into water of condensation in described vapour condenser; Another part supercritical water, by described water-fused salt heat exchanging device, is passed to described fused salt regenerative system by heat, then can be by described development unit vacuum flashing, and what obtain can heat oxygen-eliminating device compared with low parameter steam.
Preferably, a little less than solar radiation slightly, but when described supercritical water heat absorber still can produce the supercritical water that meets steam turbine 60%～100% rated load, open described main feed-regulating valve and described main steam control valve, close described secondary feed-regulating valve, described steam inlet stop valve and described steam (vapor) outlet modulating valve; Described condensate pump is sent water of condensation into described oxygen-eliminating device, water after deoxygenation enters described supercritical water heat absorber heating and generates supercritical water after described feed water pump, supercritical water enters described steam turbine and drives described generator acting, and in described vapour condenser, is again condensed into water of condensation after heat release acting.
Preferably, when solar radiation poor, and when described supercritical water heat absorber 4 still can produce the supercritical water that meets steam turbine 0～60% rated load, open described main feed-regulating valve, described secondary feed-regulating valve, described main steam control valve and described steam (vapor) outlet modulating valve, close described steam inlet stop valve; Described condensate pump is sent water of condensation into described oxygen-eliminating device, water after deoxygenation enters respectively described supercritical water heat absorber and fused salt-water-to-water heat exchanger after described feed water pump, the common supercritical water that produces 60%～100% rated load of described supercritical water heat absorber and fused salt regenerative system, supercritical water enters steam turbine and drives generator acting, after heat release acting, is again condensed into water of condensation in vapour condenser.
Preferably, when night or described supercritical water heat absorber cannot produce supercritical water, open described secondary feed-regulating valve and described steam (vapor) outlet modulating valve, close described main feed-regulating valve, described main steam control valve and described steam inlet stop valve; Described condensate pump is sent water of condensation into described oxygen-eliminating device, water after deoxygenation enters described fused salt-water-to-water heat exchanger after described feed water pump, described fused salt regenerative system produces supercritical water, supercritical water enters described steam turbine and drives generator acting, and in vapour condenser, is again condensed into water of condensation after heat release acting.
The present invention, owing to adopting above technological scheme, makes it compared with prior art, has following advantage and good effect:
(1) the present invention has utilized the high advantage of supercritical water mechanical efficiency, has improved tower type solar energy thermal power generation electricity conversion;
(2) the present invention is that tower type solar solar-thermal generating system has added fused salt regenerative system, and fused salt is as at present main flow and outstanding heat storage medium the most, and when night or solar radiation are when poor, the heat of its storage can guarantee steam turbine power generation;
(3) when the present invention utilizes fused salt advantage, the tower of having avoided absorbing heat on fused salt, and salt melting system equipment can compact Layout, has shortened fused salt duct length, has reduced greatly fused salt and has solidified the system safety hazards of bringing;
(4) the present invention has utilized the feature of supercritical water heat absorption heat release without phase transformation and latent heat of phase change, just less heat transfer temperature difference and higher regenerator temperature be can guarantee with simple single-stage fused salt regenerative system, thereby heat storage efficiency and generating efficiency on the basis that does not increase system complexity, improved.
Accompanying drawing explanation
By reference to the accompanying drawings, by the detailed description of stating below, can more clearly understand above-mentioned and other feature and advantage of the present invention, wherein:
Fig. 1 is the schematic flow sheet at the tower type solar energy thermal power generation station of employing supercritical water heat absorber provided by the invention and fused salt accumulation of heat.
Symbol description:
1-condensate pump
2-oxygen-eliminating device
3-feed water pump
4-supercritical water heat absorber
5-water-fused salt heat exchanging device
6-development unit
The cold salt cellar of 7-
The hot salt cellar of 8-
The cold salt pump of 9-
The hot salt pump of 10-
11-fused salt-water-to-water heat exchanger
12-steam turbine
13-generator
14-vapour condenser
The main feed-regulating valve of 151-
The secondary feed-regulating valve of 152-
153-main steam control valve
154-steam inlet stop valve
155-steam (vapor) outlet modulating valve
A-moisturizing
B-extracted steam from turbine or heat absorber
C-removes to use hot equipment
Embodiment
Referring to the accompanying drawing that the embodiment of the present invention is shown, the present invention below will be described in more detail.But the present invention can be with many multi-form realizations, and should not be construed as the embodiment's who is subject in this proposition restriction.On the contrary, it is abundant and complete open in order to reach proposing these embodiments, and makes those skilled in the art understand scope of the present invention completely.In these accompanying drawings, for clarity sake, may amplify size and the relative size in layer and region.
The object of the present invention is to provide a kind of tower type solar energy thermal power generation station that adopts supercritical water heat absorber and fused salt accumulation of heat, water produces supercritical water and enters steam turbine acting generating in supercritical water heat absorber, has very high conversion efficiency of thermoelectric.Due to solar radiation on daytime, to have height to have low, when thermal-arrest energy is greater than generating institute energy requirement, by a part of supercritical water shunting, through water-fused salt heat exchanging device, transfers heat to fused salt and store; On night or daytime during cloud, fused salt again can heat exchange feedwater, produces steam electric power.Supercritical water does not produce phase transformation when heat absorption and release, and at pressure higher than 22.12 situations lower than 25.5MPa, specific heat of water varies with temperature all smaller, so with the whole process of fused salt heat exchanging in keep very little heat transfer temperature difference, fused salt can be heated to very high temperature, can greatly avoid the loss for fire of regenerative system.And compare, under the pattern of traditional water-evaporation-overheated, need to use multistage fused salt regenerative system, high-temperature molten salt regenerative system mates with the superheat section of water vapor, low-temperature molten salt regenerative system mates with evaporation of water section, and the single-stage fused salt regenerative system only needing than supercritical water is complicated a lot.
With reference to figure 1, this tower type solar energy thermal power generation station, comprises the oxygen-eliminating device 2, feed water pump 3, supercritical water heat absorber 4, steam turbine 12, vapour condenser 14 and the condensate pump 1 that are connected successively and form the first work loop, and steam turbine 12 is also connected with generator 13.Wherein, the input end of oxygen-eliminating device 2 is provided with moisturizing passage, shown in A in Fig. 1, can carry out moisturizing to whole circulation loop; Between the input end of the output terminal of feed water pump 3 and supercritical water heat absorber 4, be provided with a main feed-regulating valve 151, between the output terminal of supercritical water heat absorber 4 and the input end of steam turbine 12, be provided with a main steam control valve 153.Input end by oxygen-eliminating device 2 under original state carries out moisturizing, water is after oxygen-eliminating device 2 deoxygenations, by feed water pump 3, flow to the supercritical water heat absorber 4 being arranged on control tower, supercritical water heat absorber 4 absorbs solar energy the water after deoxygenation is transformed into supercritical water output, supercritical water enters steam turbine 12 and drives generator 13 acting generatings, after supercritical water heat release acting, in vapour condenser 14, be again condensed into water of condensation, under the effect of condensate pump 1, again enter in oxygen-eliminating device 2.Wherein, the delivery outlet of steam turbine 12 can be linked by a pipeline inlet opening of oxygen-eliminating device 2, shown in B in Fig. 1, utilizes the interior unnecessary heat energy of steam turbine 12 to heat oxygen-eliminating device 2.The present invention adopts the supercritical water generating of doing manual work, and utilizes the feature that supercritical water mechanical efficiency is high, thereby has improved tower type solar energy thermal power generation electricity conversion.
In the present embodiment, this tower type solar energy thermal power generation station also comprises fused salt regenerative system, and fused salt regenerative system further comprises water-fused salt heat exchanging device 5, development unit 6, cold salt cellar 7, hot salt cellar 8, cold salt pump 9, hot salt pump 10, fused salt-water-to-water heat exchanger 11.Concrete, one end of water-fused salt heat exchanging device 5 is connected with one end of hot salt cellar 8, and the input end of water-fused salt heat exchanging device 5 is also connected with the output terminal of supercritical water heat absorber 4 by steam inlet stop valve 154; The other end of water-fused salt heat exchanging device 5 is connected by a cold salt pump 9 with cold salt cellar 7, and the output terminal of water-fused salt heat exchanging device 5 is connected with the input end of oxygen-eliminating device 2.One end of fused salt-water-to-water heat exchanger 11 is connected by a hot salt pump 10 with the other end of hot salt cellar 8, and the output terminal of salt-water-to-water heat exchanger 11 is connected with the input end of steam turbine 12 by steam (vapor) outlet modulating valve 155; The other end of fused salt-water-to-water heat exchanger 11 is connected with the other end of cold salt cellar 7, and the input end of fused salt-water-to-water heat exchanger 11 is connected with the output terminal of feed water pump 3 by a secondary feed-regulating valve 152.Before fused salt heat absorption, after (after heat release) and heat absorption, (before heat release) is stored in respectively in cold salt cellar 7 and hot salt cellar 8, cold salt pump 9 is transported to from cold salt cellar 7 fused salt hot salt cellar 8 after water-fused salt heat exchanging device 5 absorbs heat, and hot salt pump 10 is transported to from hot salt cellar 8 fused salt cold salt cellar 7 after 11 heat releases of fused salt-water-to-water heat exchanger.
Stored energy when fused salt regenerative system is strong for solar irradiation, and can not meet when generating requires maybe can not generate electricity and use at the supercritical water producing.When steam inlet stop valve 154 is opened, part supercritical water shunting in supercritical water heat absorber 4, water-fused salt heat exchanging the device 5 of flowing through transfers heat to fused salt and is stored in hot salt cellar 8, supercritical water after cooling is flowed in development unit 6 by the water-fused salt heat exchanging device 5 of flowing through, by development unit 6 vacuum flashings, obtain compared with low parameter steam, this steam inputs to oxygen-eliminating device 2 for heating oxygen-eliminating device 2, also can be by a heat output channel to other heating equipment heat supplies, shown in C in Fig. 1, be not restricted herein.Now, oxygen-eliminating device 2, feed water pump 3, supercritical water heat absorber 4, steam inlet stop valve 154, water-fused salt heat exchanging device 5, development unit 6 form an energy storage work loop.When by steam inlet stop valve 154 closure, open auxiliary feed-regulating valve 152 and steam (vapor) outlet modulating valve 155, now oxygen-eliminating device 2, feed water pump 3, secondary feed-regulating valve 152, fused salt-water-to-water heat exchanger 11, steam (vapor) outlet modulating valve 155, steam turbine 12, vapour condenser 14 and condensate pump 1 form the second work loop, utilize the feedwater of fused salt heat exchanging in hot salt cellar, the heat energy that the produces steam electric power generating of doing manual work.
The present invention combines supercritical water acting generating and the generating of fused salt regenerative system, and fused salt is as current main flow and outstanding heat storage medium the most, and when night or solar radiation are when poor, the heat of its storage can guarantee steam turbine power generation; When the present invention utilizes fused salt advantage, the tower of having avoided absorbing heat on fused salt, and salt melting system equipment can compact Layout, has shortened fused salt duct length, has reduced greatly fused salt and has solidified the system safety hazards of bringing; In addition, utilize the feature of supercritical water heat absorption heat release without phase transformation and latent heat of phase change, just less heat transfer temperature difference and higher regenerator temperature be can guarantee with simple single-stage fused salt regenerative system, thereby heat storage efficiency and generating efficiency on the basis that does not increase system complexity, improved.
The tower type solar energy thermal power generation station of employing supercritical water heat absorber provided by the invention and fused salt accumulation of heat, its specific operation process is as follows:
When solar radiation is better, open main feed-regulating valve 151, main steam control valve 153 and steam inlet stop valve 154, close secondary feed-regulating valve 152 and steam (vapor) outlet modulating valve 155; Condensate pump 1 is sent water of condensation into oxygen-eliminating device 2, water after deoxygenation through feed water pump 3 laggard enter supercritical water heat absorber 4 under the effect of solar energy, heat generation supercritical water, part supercritical water enters steam turbine 12 and drives generator 13 to do work, and after heat release acting, is again condensed into water of condensation in vapour condenser 14; Another part supercritical water by water-fused salt heat exchanging device 5, is passed to fused salt regenerative system by heat, then can pass through development unit 6 vacuum flashings, and what obtain can heat oxygen-eliminating device compared with low parameter steam, also can be to power station other with hot equipment heat supply.
A little less than solar radiation slightly, but when supercritical water heat absorber 4 still can produce the supercritical water that meets steam turbine 60%～100% rated load, open main feed-regulating valve 151 and main steam control valve 153, close secondary feed-regulating valve 152, steam inlet stop valve 154 and steam (vapor) outlet modulating valve 155; Condensate pump 1 is sent water of condensation into oxygen-eliminating device 2, water after deoxygenation through feed water pump 3 laggard enter 4 heating of supercritical water heat absorber generate supercritical waters, supercritical water enters steam turbine 12 and drives generator 13 to do work, and after heat release acting, is again condensed into water of condensation in vapour condenser 14.
When solar radiation poor, and when supercritical water heat absorber 4 still can produce the supercritical water that meets steam turbine 0～60% rated load, open main feed-regulating valve 151, secondary feed-regulating valve 152, main steam control valve 153 and steam (vapor) outlet modulating valve 155, steam off inlet shutoff valve 154; Condensate pump 1 is sent water of condensation into oxygen-eliminating device 2, water after deoxygenation enters respectively supercritical water heat absorber 4 and fused salt-water-to-water heat exchanger 11 after feed water pump 3, supercritical water heat absorber 4 and the common supercritical water that produces 60%～100% rated load of fused salt regenerative system, supercritical water enters steam turbine 12 and drives generator 13 to do work, and after heat release acting, is again condensed into water of condensation in vapour condenser 14.
When night or supercritical water heat absorber 4 cannot produce supercritical water, open auxiliary feed-regulating valve 152 and steam (vapor) outlet modulating valve 155, close main feed-regulating valve 151, main steam control valve 153 and steam inlet stop valve 154; Condensate pump 1 is sent water of condensation into oxygen-eliminating device 2, water after deoxygenation enters fused salt-water-to-water heat exchanger 11 after feed water pump 3, the supercritical water that fused salt regenerative system produces, supercritical water enters steam turbine 12 and drives generator 13 to do work, and after heat release acting, is again condensed into water of condensation in vapour condenser 14.
The present invention has utilized the high advantage of supercritical water mechanical efficiency, has improved tower type solar energy thermal power generation efficiency.Tower type solar solar-thermal generating system has increased fused salt regenerative system, and fused salt is as at present main flow and outstanding heat storage medium the most, and when night or solar radiation are when poor, the heat of its storage can guarantee steam turbine power generation.When utilizing fused salt advantage, the tower of having avoided absorbing heat on fused salt, and salt melting system equipment can compact Layout, has shortened fused salt duct length, has reduced greatly fused salt and has solidified the system safety hazards of bringing.Utilized the feature of supercritical water heat absorption heat release without phase transformation and latent heat of phase change, just less heat transfer temperature difference and higher regenerator temperature be can guarantee with simple single-stage fused salt regenerative system, thereby heat storage efficiency and generating efficiency on the basis that does not increase system complexity, improved.
Those skilled in the art should be understood that the present invention can not depart from the spirit or scope of the present invention with many other concrete forms realizations.Although described embodiments of the invention, should understand the present invention and should not be restricted to these embodiments, within the spirit and scope of the invention that those skilled in the art can define as appended claims, make and change and revise.
Claims (10)
1. one kind adopts the tower type solar energy thermal power generation station of supercritical water heat absorber and fused salt accumulation of heat, it is characterized in that, comprise the oxygen-eliminating device, feed water pump, supercritical water heat absorber, steam turbine, vapour condenser and the condensate pump that are connected successively and form the first power generation circuit, described steam turbine is connected with a generator; Input end at described oxygen-eliminating device under original state carries out moisturizing, water is after described oxygen-eliminating device deoxygenation, by described feed water pump, flow to the described supercritical water heat absorber being arranged on control tower, described supercritical water heat absorber absorbs solar energy the water after deoxygenation is transformed into supercritical water output, described supercritical water enters described steam turbine and drives described generator acting generating, after described supercritical water heat release acting, in described vapour condenser, be again condensed into water of condensation, under the effect of described condensate pump, again enter in described oxygen-eliminating device.
2. the tower type solar energy thermal power generation station of employing supercritical water heat absorber according to claim 1 and fused salt accumulation of heat, it is characterized in that, described tower type solar power station also comprises fused salt regenerative system, and described fused salt regenerative system is connected in parallel on the loop between described supercritical water heat absorber and described steam turbine; Described fused salt regenerative system is also connected with the input end of described oxygen-eliminating device, and described oxygen-eliminating device, feed water pump, supercritical water heat absorber and described fused salt regenerative system form an energy storage work loop; Described fused salt regenerative system is also connected with described feedwater delivery side of pump, and described oxygen-eliminating device, feed water pump, fused salt regenerative system, steam turbine, vapour condenser and condensate pump form the second power generation circuit.
3. the tower type solar energy thermal power generation station of employing supercritical water heat absorber according to claim 2 and fused salt accumulation of heat, it is characterized in that, described fused salt regenerative system comprises water-fused salt heat exchanging device, development unit, cold salt cellar, cold salt pump, hot salt cellar, hot salt pump, fused salt-water-to-water heat exchanger;
The two ends of described water-fused salt heat exchanging device connect respectively one end of described hot salt cellar and described cold salt cellar, and described water-fused salt heat exchanging device is also connected with the output terminal of described supercritical water heat absorber with the connecting end of described hot salt cellar, described water-fused salt heat exchanging device is also connected with the input end of described oxygen-eliminating device by described development unit with the connecting end of described cold salt cellar;
The two ends of described fused salt-water-to-water heat exchanger connect respectively the other end of described hot salt cellar and described cold salt cellar, and described fused salt-water-to-water heat exchanger is also connected with the input end of described steam turbine with the connecting end of described hot salt cellar, described fused salt-water-to-water heat exchanger is also connected with described feedwater delivery side of pump with the connecting end of described cold salt cellar.
4. the tower type solar energy thermal power generation station of employing supercritical water heat absorber according to claim 3 and fused salt accumulation of heat, it is characterized in that, between described water-fused salt heat exchanging device and described cold salt cellar, be provided with cold salt pump, between described hot salt cellar and described fused salt-water-to-water heat exchanger, be provided with hot salt pump.
5. the tower type solar energy thermal power generation station of employing supercritical water heat absorber according to claim 3 and fused salt accumulation of heat, it is characterized in that, between described feedwater delivery side of pump and the input end of described supercritical water heat absorber, be provided with a main feed-regulating valve, between described feedwater delivery side of pump and the input end of described fused salt-water-to-water heat exchanger, be provided with a secondary feed-regulating valve, the output terminal of described supercritical water heat absorber and the input end of described steam turbine are provided with a main steam control valve, the input end of the output terminal of described supercritical water heat absorber and described water-fused salt heat exchanging device is provided with a steam inlet stop valve, the output terminal of described fused salt-water-to-water heat exchanger and the input end of steam turbine are provided with a steam (vapor) outlet modulating valve.
6. the tower type solar energy thermal power generation station of employing supercritical water heat absorber according to claim 3 and fused salt accumulation of heat, is characterized in that, the output terminal of described development unit is provided with a heat output channel, for to other heating equipment heat supplies.
7. the tower type solar energy thermal power generation station of employing supercritical water heat absorber according to claim 5 and fused salt accumulation of heat, is characterized in that,
When solar radiation is better, open described main feed-regulating valve, described main steam control valve and described steam inlet stop valve, close described secondary feed-regulating valve and described steam (vapor) outlet modulating valve; Described condensate pump is sent water of condensation into described oxygen-eliminating device, and the water after deoxygenation enters described supercritical water heat absorber after described feed water pump, and under the effect of solar radiation, heating produces supercritical water; Part supercritical water enters described steam turbine and drives described generator acting, after heat release acting, is again condensed into water of condensation in described vapour condenser; Another part supercritical water, by described water-fused salt heat exchanging device, is passed to described fused salt regenerative system by heat, then can be by described development unit vacuum flashing, and what obtain can heat described oxygen-eliminating device compared with low parameter steam.
8. the tower type solar energy thermal power generation station of employing supercritical water heat absorber according to claim 5 and fused salt accumulation of heat, is characterized in that,
A little less than solar radiation slightly, but when described supercritical water heat absorber still can produce the supercritical water that meets steam turbine 60%～100% rated load, open described main feed-regulating valve and described main steam control valve, close described secondary feed-regulating valve, described steam inlet stop valve and described steam (vapor) outlet modulating valve; Described condensate pump is sent water of condensation into described oxygen-eliminating device, water after deoxygenation enters described supercritical water heat absorber heating and generates supercritical water after described feed water pump, supercritical water enters described steam turbine and drives described generator acting, and in described vapour condenser, is again condensed into water of condensation after heat release acting.
9. the tower type solar energy thermal power generation station of employing supercritical water heat absorber according to claim 5 and fused salt accumulation of heat, is characterized in that,
When solar radiation poor, and when described supercritical water heat absorber still can produce the supercritical water that meets steam turbine 0～60% rated load, open described main feed-regulating valve, described secondary feed-regulating valve, described main steam control valve and described steam (vapor) outlet modulating valve, close described steam inlet stop valve; Described condensate pump is sent water of condensation into described oxygen-eliminating device, water after deoxygenation enters respectively described supercritical water heat absorber and fused salt-water-to-water heat exchanger after described feed water pump, the common supercritical water that produces 60%～100% rated load of described supercritical water heat absorber and fused salt regenerative system, supercritical water enters steam turbine and drives generator acting, after heat release acting, is again condensed into water of condensation in vapour condenser.
10. the tower type solar energy thermal power generation station of employing supercritical water heat absorber according to claim 5 and fused salt accumulation of heat, is characterized in that,
When night or described supercritical water heat absorber cannot produce supercritical water, open described secondary feed-regulating valve and described steam (vapor) outlet modulating valve, close described main feed-regulating valve, described main steam control valve and described steam inlet stop valve; Described condensate pump is sent water of condensation into described oxygen-eliminating device, water after deoxygenation enters described fused salt-water-to-water heat exchanger after described feed water pump, described fused salt regenerative system produces supercritical water, supercritical water enters described steam turbine and drives generator acting, and in vapour condenser, is again condensed into water of condensation after heat release acting.
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