CN106885232A - A kind of liquid energy-storage system suitable for fired power generating unit depth peak regulation - Google Patents
A kind of liquid energy-storage system suitable for fired power generating unit depth peak regulation Download PDFInfo
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- CN106885232A CN106885232A CN201710234639.XA CN201710234639A CN106885232A CN 106885232 A CN106885232 A CN 106885232A CN 201710234639 A CN201710234639 A CN 201710234639A CN 106885232 A CN106885232 A CN 106885232A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 43
- 239000007788 liquid Substances 0.000 title claims abstract description 39
- 150000003839 salts Chemical class 0.000 claims abstract description 208
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 230000006837 decompression Effects 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000013021 overheating Methods 0.000 claims description 11
- 238000010248 power generation Methods 0.000 claims description 11
- 229920006395 saturated elastomer Polymers 0.000 claims description 10
- 238000003303 reheating Methods 0.000 claims description 6
- 230000005619 thermoelectricity Effects 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 2
- 238000010025 steaming Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims 1
- 238000002844 melting Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 9
- 238000013508 migration Methods 0.000 description 6
- 230000005012 migration Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 230000001172 regenerating effect Effects 0.000 description 5
- 230000009102 absorption Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002803 fossil fuel Substances 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a kind of liquid energy-storage system suitable for fired power generating unit depth peak regulation, including low-temperature molten salt storage tank, salt storage tank, fused salt heat dump, fused salt radiator, steam reducer and connecting pipe, low-temperature molten salt storage tank is connected by low-temperature molten salt heat absorbing conduit with fused salt heat dump, fused salt heat dump is connected by high-temperature molten salt heat absorbing conduit with salt storage tank, salt storage tank is connected by high-temperature molten salt heat release pipeline with fused salt radiator, and fused salt radiator is connected by low-temperature molten salt heat release pipeline with low-temperature molten salt storage tank；Fused salt heat dump is connected by steam by-pass pipe valve and steam heat release return with boiler and Steam Turbine；Steam Turbine and condenser are connected with the high-pressure heater and low-pressure heater of fired power generating unit, and fused salt radiator is arranged between boiler and high-pressure heater and is connected with high-pressure heater, and steam reducer is arranged on the steam heat release return.
Description
Technical field
The present invention relates to the technical field that molten salt energy-storage generates electricity, more particularly, it is related to a kind of suitable for fired power generating unit depth
Spend the liquid energy-storage system of peak regulation.
Background technology
On 07 22nd, 2016, National Development and Reform Committee, National Energy Board were externally issued " on printing and distributing《Regenerative resource peak regulation
Unit preferentially generates electricity trial method》Notice ".《Trial method》Clearly, for regenerative resource regulating units, various regions can combine
Regenerative resource construction scale, situation of dissolving, power supply architecture and part throttle characteristics, it is renewable energy to arrange certain scale coal group of motors
Source peak regulation.Certain areas are to ensure that power system is dissolved to regenerative resource, or even require that fired power generating unit carries out depth peak regulation
(20% underload), but for fired power generating unit, due to being limited by burning, even if carrying out peak regulation by throwing oil, one is to adjust
Peak effect on driving birds is not good, two is the safe and stable operation for influenceing boiler.Therefore, on the premise of ensureing that fired power generating unit is normally run, it is
Substantially regenerative resource is dissolved, can be coordinated by considering to increase a set of liquid power generation molten salt energy storage system in thermal power plant
Fired power generating unit carries out heat accumulation and heat release, so as to solve the problems, such as fired power generating unit depth peak regulation.
Fused salt as a kind of highly developed heat-storage medium, due to its cheap, stable and reliable for performance and usable temperature
The interval advantage such as wider of degree, power generation molten salt energy storage system is had been widely used in solar heat power generation system, and possesses extensive business
The ability of industry application.
The content of the invention
In order to solve technical problem present in prior art, it is an object of the invention to provide one kind using the storage of liquid fused salt
Can mode coordinate the conventional fired power generating unit to carry out the liquid energy-storage system of variable load operation.
The invention provides a kind of liquid energy-storage system suitable for fired power generating unit depth peak regulation, the liquid energy-storage system
Including low-temperature molten salt storage tank, salt storage tank, fused salt heat dump, fused salt radiator, steam reducer and connecting pipe, its
In,
Low-temperature molten salt storage tank is connected by low-temperature molten salt heat absorbing conduit with fused salt heat dump, and the fused salt heat dump is by height
Temperature molten salt heat absorbing conduit is connected with salt storage tank, and the salt storage tank is put by high-temperature molten salt heat release pipeline and fused salt
Hot device connection, the fused salt radiator is connected by low-temperature molten salt heat release pipeline with low-temperature molten salt storage tank；
The fused salt heat dump is by steam by-pass pipe valve and the boiler and vapour of steam heat release return and fired power generating unit
Wheel unit is connected, and the Steam Turbine and condenser are connected with the high-pressure heater and low-pressure heater of fired power generating unit, described
Fused salt radiator is arranged between boiler and high-pressure heater and is connected with high-pressure heater, and the steam reducer is arranged on institute
State on steam heat release return.
It is applied to one embodiment of the liquid energy-storage system of fired power generating unit depth peak regulation, the liquid storage according to the present invention
Energy system coordinates with fired power generating unit carries out depth peak regulation, wherein, low-temperature molten salt reality is heated by the vapour source for coming from fired power generating unit
The storage of existing energy, and the release of energy is realized by the feedwater that high-temperature molten salt heating comes from high-pressure heater, wherein, it is described
Vapour source is high temperature super heated steam.
According to the present invention suitable for one embodiment of the liquid energy-storage system of fired power generating unit depth peak regulation, work as fired power generating unit
When being the unit without reheat system, the vapour source is high temperature main steam；When fired power generating unit is the fired power generating unit for having reheat system,
The vapour source be high temperature main steam and/or reheated steam, wherein, the reheated steam be single reheat steam and/or it is secondary again
Vapours.
It is applied to one embodiment of the liquid energy-storage system of fired power generating unit depth peak regulation according to the present invention, after the heat release
The reduction of high temperature super heated steam parameter be changed into cryogenic overheating steam or saturated vapor, enter after decompression and boiler reheating or enter vapour
Wheel unit continues to do work.
According to the present invention suitable for one embodiment of the liquid energy-storage system of fired power generating unit depth peak regulation, work as fired power generating unit
When being the unit without reheat system, the fused salt heat dump passes through main steam bypass duct and main steam heat release return and pot
Stove is connected with Steam Turbine；When fired power generating unit is the single reheat unit for having reheat system, the fused salt heat dump passes through
Main steam bypass duct, main steam heat release return and/or single reheat steam by-pass pipe valve, the heat release of single reheat steam are returned
Road pipeline is connected with boiler and Steam Turbine；When fired power generating unit is the double reheat power generation sets for having reheat system, the fused salt
Heat dump is by main steam bypass duct, main steam heat release return and/or one/double reheat steam by-pass pipe valve, one/bis-
Secondary reheated steam heat release return is connected with boiler and Steam Turbine.
It is applied to one embodiment of the liquid energy-storage system of fired power generating unit depth peak regulation, the main steam according to the present invention
Steam is provided with heat release return, single reheat steam heat release return and double reheat steam heat release return
Pressure reducer.
According to the present invention suitable for one embodiment of the liquid energy-storage system of fired power generating unit depth peak regulation, work as fired power generating unit
When being the unit without reheat system, the quantity of the fused salt heat dump is at least 1；When fired power generating unit be have reheat system one
During secondary reheating embrittlement, the quantity of the fused salt heat dump is at least 2；When fired power generating unit is the double reheat machine that has reheat system
During group, the quantity of the fused salt heat dump is at least 3.
The present invention coordinates the conventional fired power generating unit to carry out variable load operation by way of using liquid molten salt energy-storage, in guarantor
On the premise of card boiler minimum safe load operation, the demand that power network is surfed the Net to unit underload is met.In the depth peak regulation stage,
Low-temperature molten salt is heated to be into high-temperature molten salt using high temperature super heated steam more than needed carries out the storage of energy；When needed, then pass through
The energy of storage is back to unit by the mode of high-temperature molten salt heating feedwater, it is achieved thereby that the effective mobility of energy；Furthermore, lead to
Cross heating feedwater and improve boiler inlet temperature, boiler coal consumption is also reduced to a certain extent.To sum up, it is of the invention suitable for thermoelectricity
The liquid energy-storage system of unit depth peak regulation have effectively achieved the migration of energy and energy saving.
Brief description of the drawings
Fig. 1 shows the liquid energy-storage system suitable for fired power generating unit depth peak regulation according to an exemplary embodiment of the present invention
Attachment structure schematic diagram.
Description of reference numerals：
1- low-temperature molten salts storage tank, 2- salt storage tanks, 3- fused salts heat dump, 4- main steam lines, the bypass of 5- main steams
Pipeline, 6- fused salts radiator, 7- steam reducers, 8- main steam heat releases return, 9- single reheat steam heat release loop pipes
Road, 10- double reheat steam heat releases return, 11- single reheats jet chimney, 12- single reheats steam by-pass pipe valve,
13- double reheats jet chimney, 14- double reheat steam by-pass pipe valves；111- low-temperature molten salts heat absorbing conduit, 112- high-temperature molten salts
Heat absorbing conduit, 121- low-temperature molten salt heat releases pipeline, 122- high-temperature molten salt heat release pipelines.
Specific embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive
Feature and/or step beyond, can combine by any way.
Any feature disclosed in this specification, unless specifically stated otherwise, can be equivalent or with similar purpose by other
Alternative features are replaced.I.e., unless specifically stated otherwise, each feature is an example in a series of equivalent or similar characteristics
.
Technical scheme meets conventional thermal motor indeed through using a set of liquid power generation molten salt energy storage system
The need for group carries out depth peak regulation, while boiler minimum safe load operation is ensured, power network is also met to unit underload
The requirement of online, and heat absorption by power generation molten salt energy storage system effectively realizes the migration rather than waste of energy with exothermic process.
The present invention be applied to conventional fossil fuel fired power generating unit coordinate power network carry out adjust depth peak regulation when by the way of liquid energy storage
The process of energy transfer is realized, wherein, conventional fossil fuel fired power generating unit both can be the unit without reheat system, or
Conventional single reheat unit or new double reheat power generation sets, and liquid energy-storage system is then used and has realized commercial applications
Ripe fused salt is used as energy-accumulating medium.
The present invention will be carried out in detail suitable for the structure and principle of the liquid energy-storage system of fired power generating unit depth peak regulation below
Thin explanation.
Fig. 1 shows the liquid energy-storage system suitable for fired power generating unit depth peak regulation according to an exemplary embodiment of the present invention
Attachment structure schematic diagram.
As shown in figure 1, exemplary embodiment of the invention, the liquid storage suitable for fired power generating unit depth peak regulation
Energy system includes low-temperature molten salt storage tank 1, salt storage tank 2, fused salt heat dump 3, fused salt radiator 6, steam reducer 7 and connects
Adapter road, low-temperature molten salt storage tank 1 is used to store low-temperature molten salt, and salt storage tank 2 is used to store high-temperature molten salt, fused salt heat dump
3 heat absorptions for realizing fused salt and the storage of energy, fused salt radiator 6 realize the heat release of fused salt and the release of energy, steam reducer 7
Realize the reduced pressure treatment to steam.
Wherein, low-temperature molten salt storage tank 1 is connected by low-temperature molten salt heat absorbing conduit 111 with fused salt heat dump 3, fused salt heat dump
3 are connected by high-temperature molten salt heat absorbing conduit 112 with salt storage tank 2, and salt storage tank 2 passes through high-temperature molten salt heat release pipeline
122 are connected with fused salt radiator 6, and fused salt radiator 6 is connected by low-temperature molten salt heat release pipeline 121 with low-temperature molten salt storage tank 1.
Thus, low-temperature molten salt can be flowed through after fused salt heat dump 3 absorbs heat from low-temperature molten salt storage tank 1 and gone forward side by side as high-temperature molten salt
To enter store in salt storage tank 2, and after high-temperature molten salt can flow through the heat release of fused salt radiator 6 from salt storage tank 2
As low-temperature molten salt and into storing in low-temperature molten salt storage tank.
Fused salt heat dump 3 is by steam by-pass pipe valve and the boiler and steam turbine of steam heat release return and fired power generating unit
Group is connected, and Steam Turbine and condenser are connected with the high-pressure heater and low-pressure heater of fired power generating unit, and fused salt radiator 6 sets
Put between boiler and high-pressure heater and connected with high-pressure heater, steam reducer 7 is arranged on steam heat release return
On.
Thus, in the stage of energy storage, the high temperature main steam that boiler is come from least partially passes through fused salt heat dump 3
Energy exchange is carried out with low-temperature molten salt and low-temperature molten salt is absorbed heat as high-temperature molten salt, cryogenic overheating steam or saturation after heat release
Steam continues to do work and finally enter condenser after decompression into the cylinder in the Steam Turbine of fired power generating unit, or is back to
The reheat system of boiler continues to heat low-temperature molten salt after heating up, and the cylinder entered back into afterwards in the Steam Turbine of fired power generating unit continues
Acting simultaneously finally enters condenser.In the exergonic stage, come from the feedwater of high-pressure heater by fused salt radiator 6 with
High-temperature molten salt carries out energy exchange and improves the temperature of feedwater, and the fused salt after heat release enters storage in low-temperature molten salt storage tank 1, heats up
Feedwater afterwards is into boiler and continues to be heated as high temperature super heated steam, have effectively achieved the migration of energy and reduces boiler
Heat consumption.
That is, liquid energy-storage system of the invention actually includes that high temperature super heated steam heating low-temperature molten salt carries out energy storage
Process and high-temperature molten salt the heating feedwater deposited carry out exergonic process, i.e., the vapour source heating by coming from fired power generating unit is low
Temperature molten salt realizes the storage of energy and is heated by high-temperature molten salt coming from the feedwater of high-pressure heater and realizing the release of energy, by
The conventional thermoelectricity fired power generating unit of this cooperation carries out depth peak regulation and effectively realizes energy transfer and utilization.
During high-temperature steam heating fused salt carries out energy storage, vapour source is high temperature super heated steam, and energy-storage system utilizes vapour
The part sensible heat of source release carries out heat temperature raising to fused salt, according to fired power generating unit parameter request, although the steam parameter after heat release
Reduce, but it is still cryogenic overheating state or saturated mode steam, disclosure satisfy that follow-up acting or continues the corresponding parameter request for absorbing heat.
Wherein, vapour source both may come from the high temperature main steam of fired power generating unit generation, it is also possible to come from the reheated steam of reheating embrittlement,
Including single reheat steam and/or double reheat steam simultaneously, it is also possible to realize the requirement for utilizing.
Specifically, when fired power generating unit is the unit without reheat system, vapour source is high temperature main steam；When fired power generating unit is have
During the fired power generating unit of reheat system, vapour source be high temperature main steam and/or reheated steam, wherein, reheated steam be single reheat steam
Vapour and/or double reheat steam.
It is specifically described with reference to the different situations of fired power generating unit.
When fired power generating unit is the unit without reheat system, fused salt heat dump 3 passes through main steam bypass duct 5 and thermal motor
The boiler of group is connected and is connected with the Steam Turbine of fired power generating unit by main steam heat release return 8, i.e., a part of high temperature
Main steam carries out energy exchange and heats low-temperature molten salt by fused salt heat dump 3 and low-temperature molten salt, and the cryogenic overheating after heat release steams
The subordinate's cylinder of vapour or saturated vapor then into Steam Turbine after decompression continues to do work and finally enter condenser.Meanwhile, fire
The boiler of group of motors is connected by main steam line 4 with Steam Turbine, then most of high temperature main steam is directly entered fired power generating unit
Steam Turbine do work and generated electricity.
When fired power generating unit is the single reheat unit for having reheat system, fused salt heat dump 3 passes through main steam bypass duct
5th, main steam heat release return 8 and single reheat steam by-pass pipe valve 12 are connected and by single reheat with the boiler of unit
Steam heat release return 9 is connected with the Steam Turbine of fired power generating unit, i.e., a part of high temperature main steam by fused salt heat dump 3 with
Low-temperature molten salt carries out energy exchange and heats low-temperature molten salt, and the cryogenic overheating steam or saturated vapor after heat release are returned after decompression
The single reheat system of boiler carries out single reheat intensification, and a part of single reheat steam is also by fused salt heat dump 3 and low temperature
Fused salt carries out energy exchange and heats low-temperature molten salt, and the cryogenic overheating steam or saturated vapor after heat release enter steamer after decompression
Subordinate's cylinder of unit continues to do work and finally enter condenser.Meanwhile, the boiler of fired power generating unit passes through main steam line 4 and
Secondary reheaing steam pipe 11 is connected with Steam Turbine, then most of high temperature main steam and most of single reheat steam are directly entered
Steam Turbine is done work and is generated electricity.
When fired power generating unit is the double reheat power generation sets for having reheat system, fused salt heat dump 3 passes through main steam bypass duct
5th, main steam heat release return 8, single reheat steam by-pass pipe valve 12, single reheat steam heat release return 9 and secondary
Reheated steam bypass duct 14 is connected and by double reheat steam heat release return 10 and fire with the boiler of fired power generating unit
The Steam Turbine connection of group of motors, i.e., a part of high temperature main steam carries out energy exchange by fused salt heat dump 3 and low-temperature molten salt
And low-temperature molten salt is heated, the single reheat system that the cryogenic overheating steam or saturated vapor after heat release return to boiler after decompression is entered
Row single reheat heats up, and a part of single reheat steam carries out energy exchange and adds also by fused salt heat dump 3 and low-temperature molten salt
Hot low-temperature molten salt, the double reheat system that cryogenic overheating steam or saturated vapor after heat release return to boiler after decompression carries out two
Secondary reheating heats up, and a part of double reheat steam carries out energy exchange and heats again by fused salt heat dump 3 and low-temperature molten salt
Low-temperature molten salt, cryogenic overheating steam or saturated vapor after heat release continue to do work after decompression into subordinate's cylinder of Steam Turbine
And finally enter condenser.Meanwhile, the boiler of fired power generating unit is by main steam line 4, single reheat jet chimney 11 and secondary
Reheaing steam pipe 13 is connected with the Steam Turbine of fired power generating unit, then most of high temperature main steam, most of single reheat steam
Steam Turbine is directly entered with most of double reheat steam to do work and generated electricity.
Cryogenic overheating steam or saturated vapor after heat release are back in fired power generating unit again, either into boiler reheating system
System is still directly entered subordinate's cylinder to be continued to do work, and its required pressure is required to relatively low therefore of the invention by setting decompression dress
Putting carries out reduced pressure treatment to steam, and per share vapour source need to correspond to a set of decompressor.According to one embodiment of present invention, main steam
It is provided with heat release return 8, single reheat steam heat release return 9 and double reheat steam heat release return 10
Steam reducer 7.
Also, the vapour source of high temperature super heated steam is different, corresponding systematic parameter is also different, can be arranged as required to many
Fused salt heat dump 3, can simultaneously be used for the heat exchange needs of multiply vapour source and fused salt.Specifically, when fired power generating unit is without reheat system
Unit when, the quantity of fused salt heat dump 3 is at least 1；When fired power generating unit is the single reheat unit for having reheat system, melt
The quantity of salt heat dump is at least 2；When fired power generating unit is the double reheat power generation sets for having reheat system, the number of fused salt heat dump
Measure is at least 3.
High-temperature molten salt after intensification is stored in salt storage tank 2, when fired power generating unit needs, by high-temperature molten salt from height
Extracted out in temperature molten salt storage tank 2, inlet water temperature is improved by the heating boiler feed water of fused salt radiator 6, by the storage of depth peak regulation stage
Heat be returned to fired power generating unit, so as to realize the migration of energy.Low-temperature molten salt after heat release is returned to low-temperature molten salt storage
Tank 1.Wherein, fused salt radiator 6 is arranged between boiler and high-pressure heater and is connected with high-pressure heater, thus, it is possible to pot
Stove feedwater is heated and the energy of storage is returned to fired power generating unit.
The present invention is made into one suitable for the liquid energy-storage system of fired power generating unit depth peak regulation with reference to specific embodiment
Step explanation.
Scheme explanation, wherein Steam Turbine are carried out as a example by ultra supercritical double reheat power generation sets with electrical power as 1000MWe
Steam inlet condition under declared working condition is 35MPa/615 DEG C/630 DEG C/630 DEG C, and the attachment structure of liquid energy-storage system and unit is such as
Shown in Fig. 1.
Under the operating mode for meeting boiler minimum safe operating load 30%, the generating set of Steam Turbine is with 20%THA works
Condition is run, and 10% thermic load between boiler and Steam Turbine is added by way of extracting part high temperature super heated steam and heating fused salt
To store.Wherein, fused salt is using conventional Molten Binary Salts (60wt%NaNO3+ 40wt%KNO3), it is 290 DEG C that temperature in use is interval
~565 DEG C.
1) energy process is stored
30%THA operating modes main steam corresponding with fired power generating unit under 20%THA operating modes, single reheat steam, double reheat
The parameters such as steam are as shown in table 1 below.
The 30%THA operating modes of table 1 steam parameter corresponding with fired power generating unit under 20%THA operating modes
According to depth peak regulation demand, for the load for having expired sufficient Steam Turbine 20% is exported, high temperature super heated steam need respectively from
The diverse location of fired power generating unit is extracted out, and heat temperature raising is carried out to fused salt by three fused salt heat dumps, and fused salt is by 290 DEG C of suctions of low temperature
Heat is stored heat after being warming up to 565 DEG C.Wherein, 290 DEG C of low-temperature molten salt is stored in low-temperature molten salt storage tank 1,565 DEG C
High-temperature molten salt be stored in salt storage tank 2.Superheated steam after heat release is returned to again by after steam reducer 7
Fired power generating unit is absorbed heat or is directly subsequently done work again.Such as, it is back to pot after a part of high temperature main steam heat release decompression
The single reheat system of stove is absorbed heat again, and the double reheat system weight of boiler is back to after a part of single reheat steam heat release decompression
New heat absorption, persistently does work after a part of double reheat steam heat release decompression into steam discharge low pressure (LP) cylinder, last all to enter condenser.
By heat Balance Calculation, the main steam that need to be extracted respectively, single reheat steam, double reheat quantity of steam are (with 30%
On the basis of steam turbine heat balance diagram correspondence parameter) it is as shown in table 2 below with steam parameter after accounting and heat release.
Steaming after main steam, single reheat steam, double reheat quantity of steam and accounting and heat release that table 2 is extracted respectively
Vapour parameter
Upper table is run to correspond to steam turbine when boiler is run with 30%THA operating modes with 20%THA operating modes, and additional heat is used
The superheated steam amount of drawing gas and accounting when fused salt is stored required for each section.
If each fired power generating unit depth peak regulation duration is 2h, the fused salt amount such as table that whole storage energy process needs
Shown in 3.
Fused salt amount needed for storing energy process during 3 fired power generating unit depth peak regulation of table
Upper table is that during depth peak regulation, each section of fused salt amount and fused salt heated required for fused salt carries out heat accumulation of drawing gas always is needed
The amount of asking.
2) release energy process
High-temperature molten salt after intensification is stored in salt storage tank 2, when fired power generating unit needs, by high-temperature molten salt from height
Extracted out in temperature molten salt storage tank 2, feedwater is heated by fused salt radiator 6 and improves inlet water temperature, the low-temperature molten salt after heat release is back to
In low-temperature molten salt storage tank 1.
Respectively on the basis of 75%THA operating modes and 50%THA operating modes, intensification calculating is carried out to feedwater.Feedwater rises high-temperature
Difference, then can obtain the different fused salt exotherm times, and specific result of calculation is as shown in table 4 and table 5.
Parameter list under the 75%THA operating modes of table 4
Under 75%THA operating modes, normal feed temperature is 310.2 DEG C, by after fused salt radiator, outlet feed temperature is carried
The fused salt radiator working time corresponding during different value high is different.Such as：When feed temperature is improved to 315 DEG C, fused salt is put
Hot device can work about 10h.
Parameter list under the 50%THA operating modes of table 5
Under 50%THA operating modes, normal feed temperature is 283.6 DEG C, by after fused salt radiator, outlet feed temperature is carried
The fused salt radiator working time corresponding during different value high is different.Such as：When feed temperature is improved to 290 DEG C, fused salt is put
Hot device can work 15h.
Generally speaking, program technical difficulty and risk are relatively small, newly added equipment amount is small and operation maintenance is simple, to original
Having unit need not be changed too much.
In sum, the present invention coordinates the conventional fired power generating unit to carry out varying duty by way of using liquid molten salt energy-storage
Operation, on the premise of boiler minimum safe load operation is ensured, meets the demand that power network is surfed the Net to unit underload.In depth
In the peak regulation stage, low-temperature molten salt is heated to be into high-temperature molten salt using high temperature super heated steam more than needed carries out the storage of energy；The stage
After end, then the energy of storage is back to unit by way of high-temperature molten salt heats feedwater, it is achieved thereby that energy has
Effect migration；Furthermore, boiler inlet temperature is improved by heating feedwater, boiler coal consumption is also reduced to a certain extent.To sum up, this hair
The bright liquid energy-storage system suitable for fired power generating unit depth peak regulation have effectively achieved the migration of energy and energy saving.
The invention is not limited in foregoing specific embodiment.The present invention is expanded to and any in this manual disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (7)
1. a kind of liquid energy-storage system suitable for fired power generating unit depth peak regulation, it is characterised in that the liquid energy-storage system bag
Low-temperature molten salt storage tank, salt storage tank, fused salt heat dump, fused salt radiator, steam reducer and connecting pipe are included, wherein,
Low-temperature molten salt storage tank is connected by low-temperature molten salt heat absorbing conduit with fused salt heat dump, and the fused salt heat dump passes through high temperature melting
Salt heat absorbing conduit is connected with salt storage tank, and the salt storage tank is by high-temperature molten salt heat release pipeline and fused salt radiator
Connection, the fused salt radiator is connected by low-temperature molten salt heat release pipeline with low-temperature molten salt storage tank；
The fused salt heat dump is by steam by-pass pipe valve and the boiler and steam turbine of steam heat release return and fired power generating unit
Group is connected, and the Steam Turbine and condenser are connected with the high-pressure heater and low-pressure heater of fired power generating unit, the fused salt
Radiator is arranged between boiler and high-pressure heater and is connected with high-pressure heater, and the steam reducer is arranged on the steaming
On vapour heat release return.
2. according to claim 1 suitable for the liquid energy-storage system of fired power generating unit depth peak regulation, it is characterised in that the liquid
State energy-storage system coordinates with fired power generating unit carries out depth peak regulation, wherein, low temperature is heated by the vapour source for coming from fired power generating unit and is melted
Salt realizes the storage of energy, and the release of energy is realized by the feedwater that high-temperature molten salt heating comes from high-pressure heater, wherein,
The vapour source is high temperature super heated steam.
3. according to claim 2 suitable for the liquid energy-storage system of fired power generating unit depth peak regulation, it is characterised in that work as thermoelectricity
When unit is the unit without reheat system, the vapour source is high temperature main steam；When fired power generating unit is the thermal motor that has reheat system
Group when, the vapour source be high temperature main steam and/or reheated steam, wherein, the reheated steam be single reheat steam and/or two
Secondary reheated steam.
4. according to claim 2 suitable for the liquid energy-storage system of fired power generating unit depth peak regulation, it is characterised in that after heat release
The reduction of high temperature super heated steam parameter be changed into cryogenic overheating steam or saturated vapor, enter after decompression and boiler reheating or enter vapour
Wheel unit continues to do work.
5. according to claim 3 suitable for the liquid energy-storage system of fired power generating unit depth peak regulation, it is characterised in that work as thermoelectricity
When unit is the unit without reheat system, the fused salt heat dump passes through main steam bypass duct and main steam heat release return
It is connected with boiler and Steam Turbine；When fired power generating unit is the single reheat unit for having reheat system, the fused salt heat dump
Put by main steam bypass duct, main steam heat release return and/or single reheat steam by-pass pipe valve, single reheat steam
Hot loop pipeline is connected with boiler and Steam Turbine；It is described when fired power generating unit is the double reheat power generation sets for having reheat system
Fused salt heat dump by main steam bypass duct, main steam heat release return and/or one/double reheat steam by-pass pipe valve,
One/double reheat steam heat release return is connected with boiler and Steam Turbine.
6. according to claim 5 suitable for the liquid energy-storage system of fired power generating unit depth peak regulation, it is characterised in that the master
It is provided with steam heat release return, single reheat steam heat release return and double reheat steam heat release return
Steam reducer.
7. according to claim 1 suitable for the liquid energy-storage system of fired power generating unit depth peak regulation, it is characterised in that work as thermoelectricity
When unit is the unit without reheat system, the quantity of the fused salt heat dump is at least 1；When fired power generating unit is have reheat system
Single reheat unit when, the quantity of the fused salt heat dump is at least 2；When fired power generating unit be have reheat system it is secondary again
During heat engine group, the quantity of the fused salt heat dump is at least 3.
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