CN106247621A - Distributed heat collection, energy storage system - Google Patents
Distributed heat collection, energy storage system Download PDFInfo
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- CN106247621A CN106247621A CN201610880783.6A CN201610880783A CN106247621A CN 106247621 A CN106247621 A CN 106247621A CN 201610880783 A CN201610880783 A CN 201610880783A CN 106247621 A CN106247621 A CN 106247621A
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- Prior art keywords
- salt
- heat
- temperature
- fused salt
- energy storage
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
- F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid
- F24H7/0208—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid using electrical energy supply
- F24H7/0233—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid using electrical energy supply the transfer fluid being water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The present invention relates to the distributed heat collection, energy storage system with fused salt as medium, including collection thermal sub-system, fused salt pipe network, energy storage subsystem and four subsystems of heat exchange subsystem, described collection thermal sub-system includes heat collecting module, heat collecting module is connected with energy storage subsystem by fused salt pipe network, fused salt pipe network uses high-temperature molten salt pipeline and low-temperature molten salt pipeline is two-tube applies side by side, described energy storage subsystem includes hot melt salt storage tank and sloppy heat salt storage tank, described heat exchange subsystem includes heat exchanger, wherein the hot melt salt in hot melt salt storage tank carries out heat exchange by heat exchanger and water, produce vapours, fused salt after heat exchange becomes sloppy heat salt, flow into sloppy heat salt storage tank.Design innovation of the present invention is strong, system is reasonable in design, clear, by unique technique and flow process, efficiently solves fused salt conveying and the energy storage problem in distributed photo-thermal power generation field, the problem that particularly extensive fused salt pipe network exists frozen block risk, it is ensured that system stability, Effec-tive Function.
Description
Technical field
The present invention relates to a kind of distributed heat collection, energy storage system with fused salt as medium, belong to photo-thermal power generation technical field.
Background technology
Current photo-thermal power generation field is many with fused salt for heat absorption and heat accumulation working medium with the solar power station of heat storage capacity.Due to
Solar energy current density is low, and light thermo-power station needs to take substantial amounts of land resource, uses the design of modularity Jing Chang to increase substantially
Jing Chang light efficiency, thus improve land utilization ratio.In modular photo-thermal Power Plant Design, generally include 3-20 identical mirror
Field and heat collecting module, each heat collecting module one fused salt heat extractor of configuration, pump the sloppy heat salt taken through heat extractor from energy-storage system
Converge into heating power island hot melt salt storage tank by pipe network after heating up into hot melt salt and store heat.At generating intermittent fever fused salt through heat exchange subsystem
System heat exchange, water absorbs fused salt heat, becomes the generating of superheated steam pushing turbine.Sloppy heat salt is entered with the sloppy heat salt after water heat exchange
Storage tank, then by the pump for liquid salts on sloppy heat salt storage tank, fused salt pushed to each heat collecting module and again carry after heat extractor heats up
To heating power island hot melt salt storage tank, complete once to circulate.
Due to physicochemical characteristics and the technical characterstic of modular optical thermo-power station of fused salt itself, its fused salt need to be carried,
Energy storage scheme carries out innovative design.
First it is the conveying of fused salt, due to the technical characterstic of light thermo-power station, does not possess optically focused condition overcast and rainy, night etc.
In the case of, i.e. lose the basic origin of heat of fused salt, now there is frozen block risk in the pipe-line transportation system in power station.With usage amount
As a example by the sodium nitrate of maximum, potassium nitrate two end number mixing fused salt, temperature reduces less than 300 DEG C of its viscosity with temperature and sharply increases,
Dropping to 238 DEG C and start crystallization occur, this physicochemical characteristics determines the suitable delivery temperature of fused salt must not be less than 260 DEG C,
The most easily cause equipment or fused salt pipe freezeup, the inefficacy of fused salt loop heat tracing or insulation be light thermo-power station principal risk source it
One.For large-scale fused salt pipe network, if using a large amount of electrically heat tracing mode that pipeline is carried out heat tracing certainly will cause plant consumption
Huge, cause economy of power plant to reduce.For these reasons, fused salt pipe network is as connecting collecting system and the " blood of energy-storage system
Pipe " to possess transmittability timely, stable, efficient, it is ensured that fused salt through equipment, pipeline whole process without frozen block, and electricity to be taken into account
The economy that factory runs.
Next to that the flow of fused salt and temperature fluctuation, owing to modular optical thermo-power station uses fused salt pipe network conveying fused salt, often
Individual heat collecting module is not with opening with pass, and in heat collecting module shutdown process, fused salt confluxes through pipe network and hot temperature of molten salt can be caused to go out
Now fluctuate, the basic demand that energy-storage system stored energy capacitance to be possessed is big, radiation loss is little, also want can with collecting system,
Fused salt pipe network is allocated flexibly, is actively engaged in flow, temperature isoparametric regulation control.
Summary of the invention
It is an object of the invention to: for the technical characterstic of modular optical thermo-power station, propose a set of innovative distributed collection
The technical scheme of hot energy storage.Use the program can greatly reduce fused salt frozen block risk, give full play to the spirit of modular optical steam power plant
Jing Chang alive, efficient, large-scale arranges ability, reduces large-scale photo-thermal power generation project global design difficulty to greatest extent and builds week
Phase, and improve land utilization ratio.
For achieving the above object, the technical solution adopted in the present invention is:
(1) system equipment
Distributed heat collection, energy storage system of the present invention includes collecting thermal sub-system, fused salt pipe network, energy storage subsystem and heat exchange
System.
Collection thermal sub-system in the present invention is made up of 3-20 heat collecting module, include in single heat collecting module heat extractor,
Sloppy heat salt buffer tank and sloppy heat salt buffer tank pump, hot melt salt buffer tank and hot melt salt buffer tank pump, temperature sensor, Flow-rate adjustment
The connection pipeline of valve, high-temperature molten salt exhaust-valve, low-temperature molten salt exhaust-valve and equipment room；In heat extractor, the sunlight of focusing
Energy is converted into the heat of fused salt；Hot melt salt buffer tank makes hot melt salt (550 DEG C～the 580 DEG C) temperature stabilization of access pipe network, stream
Measure adjustable；Sloppy heat salt buffer tank is that sloppy heat salt (290 DEG C～the 300 DEG C) Flow-rate adjustment entering heat extractor provides when necessarily buffering
Between；Hot melt salt buffer tank pump converges into hot melt salt storage tank for hot melt salt and provides power；By sloppy heat salt buffer tank pump to heat extractor
Inject sloppy heat salt；Flow control valve plays heat extractor and imports and exports Flow-rate adjustment effect.
Fused salt pipe network in the present invention, including high-temperature molten salt pipeline, low-temperature molten salt pipeline, switching valve group, gas furnace and
Flow transducer；Low temperature, high-temperature molten salt pipeline carry hot and cold fused salt respectively, and only when circulated at low velocity, high-temperature molten salt pipeline is
Conveying sloppy heat salt, additionally, low-temperature molten salt pipeline is because of material reason, does not possess the ability of conveying hot melt salt；Switching valve group can will collect
Thermal modules and energy storage subsystem and the decoupling of fused salt pipe network, and make fused salt pipe network possess the function of fused salt circulated at low velocity；Gas furnace
Concurrent heating is provided for fused salt circulated at low velocity；The real-time traffic data of each access point are collected by pump for liquid salts frequency conversion according to flow transducer
The flow supply of the low-temperature molten salt in controller regulation sloppy heat salt storage tank.
Energy storage subsystem in the present invention, including hot melt salt storage tank and hot melt salt tank pump, sloppy heat salt storage tank and sloppy heat
Salt tank pump, switching valve group, pump for liquid salts frequency-variable controller, temperature sensor and fused salt flow to switching valve；Hot melt salt storage tank stores
The hot melt salt that the conveying of each heat collecting module comes, stores the heat needed for power plants generating electricity；After sloppy heat salt storage tank is used for storing heat exchange
Sloppy heat salt；The heat exchanger fused salt loop that hot melt salt tank pump is heat exchange subsystem provides power；Sloppy heat salt tank pump is cold for conveying
Fused salt provides power to the sloppy heat salt buffer tank of each heat collecting module；Valve group is switched by fused salt pipe network and hot melt salt when circulated at low velocity
Storage tank disconnects, and regulates sloppy heat salt tank pump rotating speed according to the real time data of flow transducer, ensures hot melt salt and sloppy heat salt with this
Flow dynamics balance；Temperature sensor is responsible for measuring the temperature of molten salt confluxed, and controls to flow to valve and holds according to temperature of molten salt signal
Row regulation action, by sloppy heat salt, the shunting of hot melt salt, is allowed to separately flow into sloppy heat salt storage tank and hot melt salt storage tank, it is ensured that hot melt
The energy storage temperature of salt storage tank is not less than setting value.
Switching valve group in the present invention is to ensure that to be cut off fused salt pipe network with heat collecting module, energy storage subsystem, makes fused salt pipe
Net can carry out circulated at low velocity with minimum power consumption；Access and regulatory function it addition, switching valve group also achieves each heat collecting module；Cut
Change valve group and control parts as crucial pipe network, must guarantee valve group self possess not frozen block, stable, use requirement flexibly, for
This, must carry out particular design to switching valve group, and the pipeline in the range of valve group diameter 3 meters is respectively mounted electric tracing, described switching
Valve group includes 4 electric gate valves in guard box and guard box and switching valve group controller, described guard box and 4 electric brakes
Aluminum silicate insulation material is filled in the space of valve, and electrical heat tracing chuck is installed in the outside of every electric gate valve, and guard box is with zinc-plated
Iron sheet or sheet metal material are constituted, and gap should overlap closely, accomplish Rainproof moisture-proof；Switching valve group is only made switching and is used, by cutting
Changing valve group controller adopter net master signal and switch over action, when making switching valve group, note non-refractory is electric
Parts are drawn guard box and fix.
Heat exchange subsystem in the present invention, including 4 heat exchangers, feed pump and steam turbine, is responsible for the heat of hot melt salt
Heat exchange is fed water, and output superheated steam promotes pushing turbine, and the sloppy heat salt after heat exchange flows into sloppy heat salt storage tank and stores.
(2) system equipment connected mode
In described heat collecting module, sloppy heat salt delivers to heat extractor, sloppy heat by sloppy heat salt buffer tank pump from sloppy heat salt buffer tank
Salt becomes hot melt salt through the high power solar energy that heat sink focuses on, then is entered hot melt salt buffer tank by pressure or gravity,
When in hot melt salt buffer tank, liquid level reaches setting value, hot melt salt buffer tank pump startup, hot melt salt is delivered to pipe network；Hot melt salt
While surge tank pump is opened, switching valve group is transformed into " transport model " from " short-circuit mode ", and the flow transducer of this module will
The real-time traffic data that measurement is arrived ' sending the control system to energy storage subsystem, send out to pump for liquid salts frequency-variable controller by control system
Go out and regulate signal, regulate sloppy heat salt tank pump rotating speed, increase the flow output of sloppy heat salt, complete access and the tune of heat collecting module
Joint.
Have when system start-up from the temperature of described heat collecting module output the hot melt salt after fused salt pipe network confluxes
Fluctuation, to this end, arrange temperature sensor on one section of high-temperature molten salt pipeline before flowing into hot melt salt storage tank, confluxes according to this section
Hot temperature of molten salt judges, controls the flow direction of high-temperature molten salt by flowing to switching valve, to guarantee to inject the height of hot melt salt storage tank
Temperature molten salt reaches the temperature of more than 500 DEG C, and temperature fused salt the most up to standard injects sloppy heat salt storage tank immediately.
When power station generates electricity, by hot melt salt tank pump by the hot melt salt of storage in hot melt salt storage tank according to generation load
Pumping into steam generating system and water heat exchange with predetermined flow, output superheated steam pushing turbine generates electricity, the sloppy heat after heat exchange
Salt enters sloppy heat salt storage tank, then by sloppy heat salt tank pump, by the sloppy heat salt pipeline of pipe network, sloppy heat salt is delivered to each heat collecting module
Sloppy heat salt buffer tank, circulate next time.
(3) distributed heat collection, energy storage system operating scheme
Distributed fused salt heat collection, energy storage system operating scheme is the part of the present invention, and following description is only that one is preferably run
Mode, is not intended that inappropriate limitation of the present invention.
System has following operational mode: collect thermal sub-system emptying, pipe network circulated at low velocity, switching valve group and energy storage subsystem master
Dynamic energy storage.
(1) collection thermal sub-system emptying: in order to prevent single heat collecting module from fused salt frozen block occurring under the conditions of without optically focused, and
Reducing heat collecting module energy consumption, the one preferably method of operation is salt melting system emptying；Salt melting system emptying refer mainly to heat extractor and
Tube emptying, the temperature of molten salt that heat extractor is discharged then enters hot melt salt buffer tank higher than setting value, does not reaches the fused salt of setting value
Then entering the power such as sloppy heat salt buffer tank, emptying available gravity, vacuum pump, blower fan, it is curved that pipe arrangement avoids the occurrence of " U " type,
In case fused salt emptying is obstructed.
(2) pipe network circulated at low velocity: fused salt pipe network system is complicated, length is generally at 5-10km, under night or overcast and rainy operating mode
Using emptying mode that pipe network can be made repeatedly to bear bigger thermal stress, the startup time during prologue of power station also can be longer, therefore may be used
The mode taking circulated at low velocity ensures fused salt and the safety of fused salt pipe network；Gas furnace is opened to fused salt pipe under the conditions of without optically focused
Net carries out concurrent heating, can ensure that network security runs for a long time, preferably solves pipe network frozen block and prologue startup is asked slowly
Topic；Fused salt pipe network uses high-temperature molten salt pipeline, the two-tube scheme laid side by side of low-temperature molten salt pipeline, when circulated at low velocity with sloppy heat
Salt (300 DEG C-320 DEG C) is working medium, by switching valve group by high-temperature molten salt pipeline and low-temperature molten salt pipeline " short-circuit ", by sloppy heat salt
Tank pump provides power, with gas furnace, fused salt is carried out concurrent heating if desired, it is ensured that fused salt pipe network is in long-time circulated at low velocity operating mode
The running temperature that lower maintenance is enough, prevents to solidify frozen block；Circulated at low velocity heat loss and gas furnace energy consumption match and can spirits
Live and regulate, both ensured fused salt pipe network not frozen block, again with minimum air consumption, minimum power consumption safe operation.
(3) energy storage subsystem actively energy storage: owing to distributed fused salt collecting system is by the shadow of solar radiation momentary fluctuation at that time
Ring, cause the instantaneous delivery of cold and hot fused salt to there will be larger fluctuation；When illumination is strong, under serious operating mode, there will be heat absorption
The hot melt salt of device constantly exports, and sloppy heat salt fails to supply in time, causes collecting system to be shut down；When fused salt pipe network is from circulated at low velocity
When being switched to normally carry, this fashion of sloppy heat salt low speeds flow in fused salt pipe network, heat collecting module is by the hot melt salt of output progressively
Injecting fused salt pipe network, start the time in this section, the temperature of molten salt that thermotropism fused salt storage tank imports is the most up to standard, and temperature section
More obvious, cause hot melt salt quality to decline；The switching valve group corresponding at heat collecting module arranges flow transducer, by each thermal-arrest
The flow of module access fused salt pipe network sends the control system of the sloppy heat salt tank pump to energy storage subsystem in real time, molten by regulation
Salt pump frequency-variable controller adjusts the rotating speed of sloppy heat salt tank pump in time, so that hot and cold flow rate of molten salt reaches balance in time；In heat
Pipe installing temperature sensor before fused salt storage tank, temperature point is no less than at 5, and interval is not more than 2 meters, confluxes to come by recording
High-temperature molten salt temperature data, control thereafter two and flow to switching valve；When temperature is higher than 500 DEG C, opens and flow to switching valve,
Certified molten salt injects hot melt salt storage tank；When temperature is less than 500 DEG C, closing and flow to switching valve, fused salt injects sloppy heat salt storage tank.
Beneficial effects of the present invention:
1. the present invention is directed to the new demand that modular optical thermo-power station proposes, it is provided that a set of perfect distributed heat collection, energy storage technology
Scheme, reduces large-scale photo-thermal power generation project global design difficulty to greatest extent；
2. use heat collecting module emptying design, the frozen block risk in heat collecting module is preferably minimized, saves pump for liquid salts power consumption, its
The method of operation that the fused salt of middle heat extractor empties according to temperature section has preferably reclaimed hot melt salt, improves system effectiveness；
3. under the conditions of not possessing optically focused, use the fused salt pipe network circulated at low velocity method of operation and to carry out concurrent heating with gas furnace anti-condensation, solve
The problem that large-scale fused salt pipe network frozen block risk of having determined is high so that the photo-thermal power generation project of distributed thermal-arrest can give full play to self
The advantages such as flexible arrangement, efficiency height, low cost；
4. use switching valve group to make fused salt pipe network possess the function of circulated at low velocity, and make each heat collecting module possess in time, safety
The ability being incorporated to, withdrawing from pipe network；
5. energy storage subsystem uses actively storage energy operation mode, makes hot and cold flow rate of molten salt keep dynamic equilibrium, cuts at circulated at low velocity
Playing the effect maintaining pipe network stability of flow when changing, therefore the energy storage temperature of hot melt salt storage tank ensured, it is to avoid low temperature melts
Being mixed into of salt；
Overall technical architecture the most of the present invention or key technology point can be used for other types photo-thermal power generation, tower to dividing for tradition
Cloth direction is developed and is provided perfect technical scheme, the dilatation to light thermo-power stations such as slot type, butterfly, linear Fresnel formulas simultaneously
Provide efficient technical scheme.
Accompanying drawing explanation
Fig. 1 is the general system diagram of the present invention；
Fig. 2 is the collection thermal sub-system detail drawing of the present invention；
Fig. 3 is fused salt pipe network and the energy storage subsystem detail drawing of the present invention；
Fig. 4 is that the switching valve group of the present invention runs schematic diagram；
Fig. 5 is the switching valve block structure detail drawing of the present invention；
Wherein:
In Fig. 1,1, heat collecting module；2, heat collecting module；3, heat collecting module；4, fused salt pipe network；5, energy storage subsystem；6, heat exchange subsystem
System；7, heat exchanger；1A, temperature sensor；2A, temperature sensor；3A, temperature sensor；1B, flow control valve；1C, flow
Regulation valve；2B, flow control valve；2C, flow control valve；3B, flow control valve；3C, flow control valve；1D, high-temperature molten salt are arranged
Empty valve；2D, high-temperature molten salt exhaust-valve；3D, high-temperature molten salt exhaust-valve；1E, low-temperature molten salt exhaust-valve；2E, low-temperature molten salt exhaust-valve；
3E, low-temperature molten salt exhaust-valve；1F, stop valve；1G, stop valve；1H, stop valve；1I, stop valve；2F, stop valve；2G, cut-off
Valve；2H, stop valve；2I, stop valve；3F, stop valve；3G, stop valve；3H, stop valve；3I, stop valve；101, heat extractor；
201, heat extractor；301, heat extractor；102, sloppy heat salt buffer tank；202, sloppy heat salt buffer tank；302, sloppy heat salt buffer tank；
102A, sloppy heat salt buffer tank pump；202A, sloppy heat salt buffer tank pump；302A, sloppy heat salt buffer tank pump；103, hot melt salt buffer tank；
203, hot melt salt buffer tank；303, hot melt salt buffer tank；103A, hot melt salt buffer tank pump；203A, hot melt salt buffer tank pump；
303A, hot melt salt buffer tank pump；401, switching valve group；402, switching valve group；403, switching valve group；404, switching valve group；405、
Switching valve group；, 406, flow transducer；407, flow transducer；408, flow transducer；409, gas furnace；410, gas furnace
Bypass valve；411, gas furnace bypass valve；412, stop valve；401A, the transport model of switching valve group;401B, switching valve group short
Road pattern；401C, the short-circuit mode of switching valve group；401D, the short-circuit mode of switching valve group;401E, electric gate valve；401F, electricity
Dynamic gate valve；401G, electric gate valve；401H, electric gate valve;401I, switching valve group controller；401J, aluminum silicate insulation material；
401K, guard box；401L, electric tracing;501, hot melt salt storage tank；501A, hot melt salt tank pump；502, sloppy heat salt storage tank；
502A, sloppy heat salt tank pump；503, switching valve group；504, pump for liquid salts frequency-variable controller；505, temperature sensor；506, fused salt stream
To switching valve；507, fused salt flows to switching valve.
Detailed description of the invention
With specific embodiment, the present invention is described in further detail below in conjunction with the accompanying drawings.
As it is shown in figure 1, a kind of distributed heat collection, energy storage system, including collection thermal sub-system (heat collecting module 1,2,3), fused salt pipe
Net 4, energy storage subsystem 5 and heat exchange subsystem 6, described collection thermal sub-system (as a example by heat collecting module 1) is main by heat extractor
101, sloppy heat salt buffer tank 102 and hot melt salt buffer tank 103 form, fused salt pipe network 4 use high-temperature molten salt pipeline (Fig. 1 solid line) and
Low-temperature molten salt pipeline (Fig. 1 dotted line) is two-tube to be laid side by side, is connected with energy storage subsystem 5 by heat collecting module 1,2,3, energy storage subsystem
System 5 is mainly made up of hot melt salt storage tank 501 and sloppy heat salt storage tank 502, the required high temperature melting of hot melt salt storage tank 501 storage plant generating
Salt, heat exchange subsystem 6 is mainly made up of 4 heat exchangers 7, hot melt salt in energy storage subsystem 5 and water heat exchange, output superheated steam,
Pushing turbine generates electricity, and the fused salt after heat exchange becomes sloppy heat salt, flows into sloppy heat salt storage tank 502.
In conjunction with system diagram in Fig. 2, heat collecting module 1(heat collecting module 2 and the heat collecting module 3 of collection thermal sub-system have identical merit
Can equipment take to operate equally) adoptable operational process is as follows:
Collection thermal flow process, now flow control valve 1B, 1C opens, and fused salt exhaust-valve 1D, 1E close, and stop valve 1F, 1G, 1I open,
Stop valve 1H closes, and the sloppy heat salt of sloppy heat salt buffer tank 102 pumps into heat extractor 101, flow by sloppy heat salt buffer tank pump 102A
Regulation valve 1B finely tunes heat extractor 101 inlet flow rate, and sloppy heat salt is irradiated by high density solar energy stream in heat extractor 101 and heats up, logical
Inflow-rate of water turbine regulation valve 1C finely tunes heat extractor 101 rate of discharge, and fused salt enters hot melt salt buffer tank 103, heat after being raised to design temperature
Hot melt salt in tank is sent into fused salt pipe network 4 by fused salt surge tank pump 103A.
Emptying flow process, now flow control valve 1B, 1C closes, and stop valve 1F opens, and stop valve 1G, 1H, 1I close, collection
Hot melt salt buffer tank pump 102A and sloppy heat salt buffer tank pump 103A in thermal modules 1 shut down, and heat collecting module 1 connects fused salt pipe network 4
Switching valve group 401 have been converted to " short-circuit mode 401D ", rely in gravity or other power-equipments emptying heat extractor 101 is molten
Salt, there will be the situation of skewness, therefore arranges temperature sensor 1A and supervise in real time during the internal temperature of molten salt emptying of large-scale heat extractor
The emptying temperature of molten salt of flow measurement warp, when temperature is less than 450 DEG C, high-temperature molten salt exhaust-valve 1D closes, low-temperature molten salt exhaust-valve 1E opens
Opening, when higher than 450 DEG C, high-temperature molten salt exhaust-valve 1D opens, low-temperature molten salt exhaust-valve 1E closes, and treats that fused salt empties the most all valves
Door is closed, and completes the emptying flow process of this module.
Circulated at low velocity flow process, if current heat collecting module accesses fused salt pipe network 4 without a longer pipeline section, flows without this
Journey operates.As a example by heat collecting module 2, during incision circulated at low velocity flow process, flow control valve 2B opens, flow control valve 2C closes,
High-temperature molten salt exhaust-valve 2D opens, low-temperature molten salt exhaust-valve 2E closes, and stop valve 2F, 2G, 2I close, and stop valve 2H opens, heat
Fused salt surge tank pump 203A shuts down, and sloppy heat salt buffer tank pump 202A start provides power, low-temperature molten salt for a pipeline section circulated at low velocity
Flow through successively: sloppy heat salt buffer tank 202 flow control valve 2B high temperature exhaust-valve 2D block valve 2H arm
Duan Lengrong salt buffer tank 202.
As shown in Figure 3 and Figure 4, fused salt pipe network 4 workflow has two kinds, as follows:
Conveying flow process, this flow process is run according to the whole heat collecting module of collecting system 1,2,3 prologue or only part of module prologue is transported
Row adjusts accordingly.When all prologue runs for heat collecting module 1,2,3, all switching valve group 401 in fused salt pipe network 4,402,
403,404,405 being " transport model 401A ", gas furnace bypass valve 410,411 cuts out, and stop valve 412 is opened, under this operating mode
Need not outer combustion gas concurrent heating anti-condensation.High-temperature molten salt is carried by high-temperature molten salt pipeline (Fig. 1 solid line), and low-temperature molten salt passes through low temperature
Fused salt pipeline conveying (Fig. 1 dotted line), is mounted on flow transducer 406,407,408 in the high-temperature pipe side of switching valve group, real
Time monitoring high-temperature molten salt access the data on flows of pipe network 4, and data are sent immediately to control system, according to high-temperature molten salt flow
Fluctuation situation regulates pump for liquid salts frequency-variable controller 504 in time and controls low-temperature molten salt flow, and reach a high temperature fused salt and low-temperature molten salt stream
Amount dynamic equilibrium, it is ensured that system stable operation.When segment set thermal modules is run, first close with heat collecting module 1, heat collecting module 2,
As a example by 3 run, heat collecting module 1 is to be directly accessed fused salt pipe network 4 after switching valve group 401, first switching valve group 401 change to
" short-circuit mode 401D ", heat collecting module 1 empties closedown again, other switching valve groups be still " transport model 401A ", with this complete every
From heat collecting module 1, do not affect other parts of system properly functioning；Close with heat collecting module 2 again, as a example by heat collecting module 1,3 runs,
Heat collecting module 2 accesses fused salt pipe network 4 by a longer pipeline section, when carrying out closing flow path, and high/low temperature fused salt palpus in a pipeline section
Continuing to operation and can prevent frozen block, therefore first switching valve group 404 changed to " short-circuit mode 401C ", switching valve group 405 is still
For " transport model 401A ", sloppy heat salt buffer tank pump 202A is relied on to provide power after heat collecting module 2 emptying is closed, it is ensured that this
The circulated at low velocity of pipeline section fused salt.
Circulated at low velocity flow process, fused salt pipe network 4 and energy storage sub-energy storage 5 system overcast and rainy, night etc. without optically focused under conditions of
Open circulated at low velocity flow process.Now heat collecting module 1,2,3 is out of service, and fused salt pipe network 4 carries out circulated at low velocity, and fused salt pipe network 4 is low
Under speed circulation process, switching valve group 401,405 is " short-circuit mode 401D ", and switching valve group 403 is " short-circuit mode 401C ", switching
Valve group 402,404 is " transport model 401A ".For avoiding without the frozen block of fused salt pipe network 4 under the conditions of optically focused, need to open gas furnace
409, and gas furnace bypass valve 410,411 is opened, stop valve 412 is closed, and makes the fused salt of circulated at low velocity by entering gas furnace
409 concurrent heatings, the thermal loss during compensation cycle.The circulated at low velocity of fused salt pipe network 4 relies on the sloppy heat salt storage of energy storage subsystem 5
Tank pump 502A provides power, and the switching valve group 503 of the energy storage subsystem 5 under this flow process is " transport model 401A ", flows to conversion
Valve 506 cuts out, 507 unlatchings, monitors temperature by temperature sensor 505.So, set needed for completing fused salt pipe network 4 circulated at low velocity
Putting, low-temperature molten salt enters cryogenic piping from sloppy heat salt storage tank 502, and end switching valve group 401,403,405 makes high/low temperature fused salt pipe
Road forms short circuit, and low-temperature molten salt returns to sloppy heat salt storage tank 502 by high-temperature pipe, and this circulated at low velocity scheme can remain large-scale molten
Salt pipe network is long-time, without frozen block, low power operation.
As shown in Figure 3 and Figure 4, energy storage subsystem 5 workflow has two kinds, as follows:
Energy storage flow process, this flow process is the crucial operational process of energy storage subsystem 5, by the active energy storage of energy storage subsystem 5, controls heat
Energy storage temperature in fused salt storage tank 501, guarantee high/low temperature flow rate of molten salt dynamic equilibrium, energy storage subsystem 5 can change with energy storage limit, limit
Heat, it is also possible to an energy storage not heat exchange.When fused salt pipe network 4 is in conveying flow process, switching valve group 503 is " transport model 401A ", control
System processed controls fused salt by monitoring temperature sensor 505 temperature signal and flows to switching valve 506,507 switch motion.With fused salt pipe
As a example by net 4 circulated at low velocity is switched to carry flow process, the fused salt of fused salt pipe network 4 high-temperature molten salt pipeline conveying progressively heat up, this mistake
Journey need to enter sloppy heat salt storage tank 502 by remaining the sloppy heat salt in high-temperature pipe when circulated at low velocity, keeps fused salt to flow to switching valve
506 unlatchings and fused salt flow to switching valve 507 and close.When temperature sensor 505 detects that temperature of molten salt is less than setting value, then send
Signal controls fused salt and flows to switching valve 506 and progressively close off, and controls fused salt simultaneously and flows to switching valve 507 and gradually open, by this Duan Leng
Fused salt is emitted into sloppy heat salt storage tank 502, has discharged, and two fused salts flow to switching valve 506,507 and playback in time, control heat with this
Energy storage temperature in fused salt storage tank 501.Meanwhile, according to the flow of flow transducer 407,408,409 corresponding to each heat collecting module
Data, pump for liquid salts frequency-variable controller 504 carries out frequency modulation, controls the flow supply of sloppy heat salt tank pump 502A regulation low-temperature molten salt,
System high temperature and low-temperature molten salt flow is made to maintain dynamic equilibrium.
Energy storage subsystem 5 circulated at low velocity flow process, this flow process is associated with the circulated at low velocity flow process of fused salt pipe network 4, now stores up
The sloppy heat salt tank pump 502A of energy subsystem 5 is that fused salt pipe network 4 circulated at low velocity provides power, energy storage subsystem 5 under this flow process
Switching valve group 503 is " transport model 401A ", and fused salt flows to that switching valve 506 cuts out, fused salt flows to switching valve 507 and opens, temperature
Sensor 505 monitoring backflow temperature of molten salt, under this flow process, sloppy heat salt enters fused salt pipe network 4 from sloppy heat salt storage tank 502, and returns to cold
Fused salt storage tank 502.
As it is shown in figure 5, switching valve group design details is as follows:
Switching valve group 401,402,403,404 as the pass key control equipment of fused salt pipe network 4, self must possess be difficult to frozen block,
Regulate the features such as quick, safe and reliable, particular design need to be carried out for this.Switching valve group 401,402,403,404 3 meters of scopes of diameter
In pipeline be respectively mounted electric tracing 401L, including 4 electric gate valve 401E in guard box 401K and guard box 401K, 401F,
401G, 401H and switching valve group controller 401I, install electrical heating outside electric gate valve 401E, 401F, 401G, 401H and protect
Temperature chuck, it is ensured that switching valve group minimum temperature everywhere is not less than 290 DEG C, and guard box 401K is by galvanized iron sheet or sheet metal material structure
Becoming, casing must accomplish Rainproof moisture-proof, and overlap joint welding is smooth, spraying high temperature antirust paint, and in case, silicon is filled in the space with switching valve group
Acid aluminium heat insulation material 401J, it is ensured that switching valve group does not occur frozen block.By using electrodynamic valve 401E, 401F, 401G, 401H to realize
The stable switching of mode of operation, it is ensured that requirement flexible, quick.Control signal derives from the master control of fused salt pipe network 4, and master control will
Signal sends to switching valve group controller 401I, then is referred to being controlled switching valve group sending action by switching valve group controller 401I
Order.This switching valve group is only for the purpose of realizing handoff functionality, and 4 electrodynamic valves 401E, 401F, 401G, 401H all use gate valve shape
Formula, it is ensured that reliability during work and concordance, the function such as regulation, standby, bypass relies on and arranges other gate valves and realize, for
The electric component of switching valve group controller 401I and other non-refractories is drawn guard box 401K and fixes.
Above the detailed description of the invention of the present invention is described, by cooperating of each system flow, meets and divide
The various operating conditions of cloth fused salt heat collection, energy storage system, but as a complete and complicated heat power engineering system, the present invention is not
It is limited to above description.For a person skilled in the art, any equal amendment to the technical program and substitute be all
Among the scope of the present invention.Therefore, the impartial conversion made without departing from the spirit and scope of the invention and amendment, all should contain
Lid is within the scope of the invention.
Claims (10)
1. a distributed heat collection, energy storage system, it is characterised in that: include collect thermal sub-system, fused salt pipe network, energy storage subsystem and
Four subsystems of heat exchange subsystem, described collection thermal sub-system includes heat collecting module, and heat collecting module passes through fused salt pipe network and energy storage
Subsystem is connected, and fused salt pipe network uses high-temperature molten salt pipeline and low-temperature molten salt pipeline is two-tube lays side by side, described energy storage
System includes hot melt salt storage tank and sloppy heat salt storage tank, and described heat exchange subsystem includes heat exchanger, wherein in hot melt salt storage tank
Hot melt salt carries out heat exchange by heat exchanger and water, produces superheated steam, and the fused salt after heat exchange becomes sloppy heat salt, flows into the storage of sloppy heat salt
Tank.
The most distributed heat collection, energy storage system, it is characterised in that: described collection thermal sub-system is by 3-20
Heat collecting module forms.
The most distributed heat collection, energy storage system, it is characterised in that: described heat collecting module includes heat absorption
Device, sloppy heat salt buffer tank and hot melt salt buffer tank, the sloppy heat salt of sloppy heat salt buffer tank pumps into heat absorption by sloppy heat salt buffer tank pump
Device, by be located at heat extractor import department flow control valve finely tune heat extractor inlet flow rate, sloppy heat salt in heat extractor by highly dense
Degree solar energy stream irradiates and heats up, and finely tunes heat extractor rate of discharge, fused salt liter by being located at the flow control valve in heat extractor exit
After design temperature, enter hot melt salt buffer tank, and by the hot melt salt buffer tank pump being provided with, the hot melt salt in tank is sent into fused salt
Pipe network.
The most distributed heat collection, energy storage system, it is characterised in that: described heat extractor import department is provided with temperature
Spend sensor and the high-temperature molten salt exhaust-valve in parallel with temperature sensor and low-temperature molten salt exhaust-valve, wherein, when temperature is less than setting
During fixed temperature, high-temperature molten salt exhaust-valve is closed, low-temperature molten salt exhaust-valve is opened, when temperature is higher than the temperature set, and high temperature melting
Salt exhaust-valve is opened, low-temperature molten salt exhaust-valve is closed.
The most distributed heat collection, energy storage system, it is characterised in that: the import department of described heat extractor and going out
It is equipped with stop valve at Kou, can select to open and close import department and the exit of heat extractor according to thermal-arrest and emptying needs
Equal stop valve.
Distributed heat collection, energy storage system the most according to claim 1, it is characterised in that: described fused salt pipe network includes low temperature
Fused salt pipeline, high-temperature molten salt pipeline, switching valve group, gas furnace and flow transducer, described low-temperature molten salt pipeline and high temperature melting
Salt pipeline is connected by switching valve group, and the high-temperature molten salt pipe side in switching valve group is mounted on flow transducer, described
Gas furnace be connected with low-temperature molten salt pipeline so that the fused salt of circulated at low velocity pass through gas furnace concurrent heating, during compensation cycle
Thermal loss.
Distributed heat collection, energy storage system the most according to claim 1, it is characterised in that: described energy storage subsystem includes heat
Fused salt storage tank, sloppy heat salt storage tank, switching valve group, pump for liquid salts frequency-variable controller, temperature sensor and fused salt flow to switching valve, described
Hot melt salt storage tank be provided with hot melt salt tank pump, sloppy heat salt tank pump on sloppy heat salt storage tank, sloppy heat salt tank pump passes through fused salt
The flow supply of the low-temperature molten salt in pump frequency conversion controller regulation sloppy heat salt storage tank, temperature sensor detects the temperature of fused salt in real time
And decide whether that being turned on or off two in parallel with temperature sensor fused salt flows to switching valve, described switching valve group connection
Low-temperature molten salt pipeline on fused salt pipe network and high-temperature molten salt pipeline.
8. according to the distributed heat collection, energy storage system described in claim 6 or 7, it is characterised in that: described switching valve group includes
4 electric gate valves in guard box and guard box and switching valve group controller, electric gate valve realizes stablizing of mode of operation and cuts
Change and instructed to the electric gate valve sending action switched by switching valve group controller, with 4 electricity in wherein said guard box
The space of dynamic gate valve is filled with aluminum silicate insulation material, and the outside of described electric gate valve is provided with electrical heat tracing chuck, described
Guard box be made up of galvanized iron sheet or sheet metal material.
Distributed heat collection, energy storage system the most according to claim 8, it is characterised in that: described switching valve group, in switching
Pipeline in the range of valve group diameter 3 meters is mounted on electric tracing.
Distributed heat collection, energy storage system the most according to claim 6, it is characterised in that: the working medium of described fused salt pipe network is
Fused salt, uses high-temperature molten salt pipeline and low-temperature molten salt pipeline is two-tube lays side by side, realizes high and low temperature fused salt pipe by switching valve group
" short-circuit " in road, and provided power by sloppy heat salt tank pump, wherein fused salt pipe network carries out concurrent heating by gas furnace concurrent heating to fused salt,
Prevent fused salt pipe network frozen block.
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