CN114876597A - System and method for realizing thermal power generating unit island operation by coupling molten salt energy storage - Google Patents
System and method for realizing thermal power generating unit island operation by coupling molten salt energy storage Download PDFInfo
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- CN114876597A CN114876597A CN202210545716.4A CN202210545716A CN114876597A CN 114876597 A CN114876597 A CN 114876597A CN 202210545716 A CN202210545716 A CN 202210545716A CN 114876597 A CN114876597 A CN 114876597A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 209
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- 229920006395 saturated elastomer Polymers 0.000 description 2
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- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- 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
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/028—Steam generation using heat accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/06—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium
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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
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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
- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a method and a system for realizing the island operation of a thermal power generating unit by coupling molten salt energy storage.A steam turbine unit is switched from a power control mode to a rotating speed control mode after FCB (FCB) triggering, and a steam turbine is switched from a combined steam admission mode to a medium pressure cylinder steam admission mode; after the rotating speed of the unit is stable, steam can be provided through the molten salt energy storage module to maintain the isolated island operation of the steam turbine; after the FCB acts, a pipeline from the molten salt energy storage module to the deaerator is closed, and a pipeline from the molten salt energy storage module to the condenser is communicated; releasing high-temperature steam to the molten salt energy storage module through a high-pressure bypass pipeline and a reheating cold section pipeline; the delivery of reheating hot section steam, intermediate pressure cylinder exhaust steam and boiler water to the molten salt energy storage module is stopped after the time delay of delta t seconds; delta t is confirmed according to the thermal inertia and test results of different units; the multi-path steam source is reasonably distributed, the steam distribution mode of the thermal power generation system and the molten salt energy storage module is optimized, and the molten salt energy storage module is fully utilized to reduce the heat loss of steam in the FCB action process on the basis of realizing the island operation function.
Description
Technical Field
The invention relates to molten salt energy storage, in particular to a system and a method for realizing isolated island operation of a thermal power generating unit by coupling molten salt energy storage.
Background
In recent years, a strong local power grid planning construction scheme in a part of regions requires that a batch of power supply guarantee points are selected as an important load center, the power supply guarantee capability in an extreme state is mainly improved, and the island operation function is achieved. According to a conventional solution idea, the FCB (fast Cut Back) function transformation is mainly carried out on a thermodynamic system equipment side (such as a bypass system, steam source switching, a PCV (positive crankcase ventilation) valve and the automatic control system so as to realize the isolated island operation of the thermal power generating unit. Because of sudden failure, the unit loses all loads immediately, the FCB is controlled quickly at the moment that the unit hangs at the full stop edge, and all automatic control systems of the machine, the furnace and the electricity make accurate coordination reaction on the control mode and process regulation in a very short time, so that the functional reliability of the FCB cannot be ensured completely. In addition, the fused salt energy storage (heat storage) technology is widely applied to coupling with a thermal power generating unit, and has huge market space in the aspects of realizing deep peak regulation and frequency modulation of the unit, constructing a Carnot battery energy storage power station and applying retired unit transformation.
The existing energy storage scheme for the unit FCB modification mostly adopts battery energy storage, and is mainly limited by the safety problem that the battery energy storage cannot be ignored and high cost, so that the energy storage scheme is difficult to popularize. The existing scheme for solving island operation by adopting molten salt energy storage focuses on the aspects of an electrical connection mode and the steam distribution of a molten salt and thermodynamic system. The operation method of the energy storage module, the control mode of the steam turbine and how the steam source keeps the hot standby state in the energy storage and release stages are not fully considered when the FCB transient switching occurs in the thermal power generating unit for coupling the molten salt energy storage.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a system and a method for realizing the isolated island operation of a thermal power generating unit by coupling molten salt energy storage, and fully considers the operation method of an energy storage module when the FCB transient switching occurs in the thermal power generating unit by coupling molten salt energy storage, the control mode of a steam turbine and the method for keeping the hot standby state of a steam source in the energy storage and energy release stages.
The invention is realized by the following technical scheme: a method for realizing the island operation of a thermal power generating unit by coupling molten salt energy storage is characterized in that after an FCB is triggered, a steam turbine unit is switched to a rotating speed control mode from a power control mode, and a steam turbine is switched to a medium pressure cylinder steam admission mode from a combined steam admission mode; after the rotating speed of the unit is stable, steam can be provided through the molten salt energy storage module to maintain the isolated island operation of the steam turbine;
after the FCB acts, the pipeline from the molten salt energy storage module to the deaerator is automatically closed, and the pipeline from the molten salt energy storage module to the condenser is opened in a linkage mode; the molten salt energy storage module recovers the heat of main steam entering a reheating cold section pipeline through a high-pressure bypass; after the FCB is triggered, the delivery of reheating hot section steam, intermediate pressure cylinder steam exhaust and boiler water supply to the molten salt energy storage module is stopped after a delay of delta t seconds; and delta t is confirmed according to the thermal inertia and FCB dynamic test results of different units.
The steam storage method in the normal operation stage comprises the following steps: supplying water to the molten salt energy storage module from the last-stage high water adding side, wherein the water is converted into superheated steam after absorbing heat in the molten salt system, the generated superheated steam is finally sent to a steam supply main pipe of the molten salt energy storage module, and the steam is gradually boosted to meet the steam inlet parameter set value p of the intermediate pressure cylinder under the FCB working condition set 。
The anti-condensation method for the steam supply main pipe of the molten salt energy storage module comprises the following steps: when the pressure p of the steam supply main pipe of the molten salt energy storage module A Is lower than the set value p of the steam supply main pipe of the molten salt energy storage module set Time, anti-condensation regulating valveKeeping the minimum opening degree of 5 percent unchanged;
when the pressure p of the steam supply main pipe A Higher than the set value p of the steam supply main pipe set During the process, the anti-condensation regulating valve is automatically put into operation, and the pressure value of the steam supply main pipe is regulated to be p set 。
When the pre-trap temperature is below p A And when the corresponding saturation temperature is reached, the condensation alarm device gives out sound and light alarm.
The molten salt heating in the operation stage comprises the following specific steps: after the fused salt energy storage module exchanges heat with the extraction steam of the existing thermal power generation system, the temperature of the fused salt energy storage module is further raised through an electric heater to store heat in the fused salt, the fused salt energy storage module enters a deaerator under the normal working condition after the extraction steam releases heat, and the fused salt energy storage module enters a condenser under the FCB action working condition.
The invention also provides a system for realizing the isolated island operation of the thermal power generating unit by coupling the molten salt energy storage, which comprises the conventional thermal power generation system, a steam extraction main pipe, a steam supply main pipe and a molten salt energy storage module; the steam extraction main pipe is connected with a heat absorption loop of the molten salt energy storage module, and the heat absorption loop is also connected with a condenser and a deaerator of the thermal power generation system; the superheated steam outlet of the fused salt energy storage module is sequentially connected with a steam supply main pipe and the inlet of a steam turbine intermediate pressure cylinder of the existing thermal power generation system, a final stage high-pressure heater of the existing thermal power generation system is connected with a heat release loop of the fused salt energy storage module, a valve rear pipeline of a high-pressure bypass valve in the existing thermal power generation system is connected with a steam extraction main pipe, and a valve front pipeline of an exhaust valve of the intermediate pressure cylinder is connected with the steam extraction main pipe; and the reheating hot section steam pipeline is also connected with a heat absorption loop of the molten salt energy storage module.
The fused salt energy storage module includes low temperature fused salt storage tank and high temperature fused salt storage tank, and the pipeline of low temperature fused salt storage tank to high temperature fused salt storage tank is the heat absorption return circuit, set gradually low temperature fused salt pump, first fused salt heat exchanger, second fused salt heat exchanger and electric heater along the fused salt flow direction in the heat absorption return circuit, the pipeline of high temperature fused salt storage tank to low temperature fused salt storage tank is for releasing heat the return circuit, set gradually high temperature fused salt pump, third fused salt heat exchanger and fourth fused salt heat exchanger along the fused salt flow direction in the heat release return circuit.
The outlet of the steam extraction main pipe is connected with the hot side inlet of the first molten salt heat exchanger, and the hot side outlet of the first molten salt heat exchanger is connected with a condenser or a deaerator; the hot side outlet of the first molten salt heat exchanger is provided with a shut-off valve to the condenser and the deaerator, and the shut-off valves are in linkage control with each other; the reheating hot section steam pipeline is connected with a hot side inlet of the second molten salt heat exchanger, a hot side outlet of the second molten salt heat exchanger is connected with a steam extraction main pipe inlet, and a check valve and a pneumatic regulating valve are sequentially arranged from the reheating hot section steam pipeline to the hot side inlet of the second molten salt heat exchanger.
The outlet of last stage high pressure heater is connected to the cold side entry linkage of fourth fused salt heat exchanger, and the cold side exit linkage of third fused salt heat exchanger supplies the female pipe of vapour, supplies to set gradually check valve and extraction of steam governing valve on the pipeline of female pipe to steam turbine intermediate pressure cylinder import.
The steam supply main pipe is also connected with a hot side inlet of the second molten salt heat exchanger, and a pneumatic regulating valve and a check valve are sequentially arranged from the steam supply main pipe to the hot side inlet of the second molten salt heat exchanger; the steam supply main pipe is provided with a steam trap on a pipeline from the steam supply main pipe to a steam turbine intermediate pressure cylinder, and the steam trap is used for preventing condensation and ensuring that the steam supply main pipe is always in a hot standby state.
A heating regulating valve is arranged between a valve front pipeline of the exhaust valve of the intermediate pressure cylinder and the steam extraction main pipe.
Compared with the prior art, the invention has the following beneficial technical effects:
the method optimizes the steam distribution mode of the thermal power generation system and the molten salt energy storage module, and fully utilizes the molten salt energy storage module to reduce the heat loss of steam in the FCB action process on the basis of realizing the island operation function; the multi-path steam sources are reasonably distributed, so that equipment modification cost can be reduced, and the steam sources with different differences are mixed and then sent into heat exchange equipment, so that the heat exchange efficiency is improved; the operation method of the energy storage module when the FCB working condition transient switching occurs in the unit is provided, and beneficial references are provided for follow-up unit transformation, system optimization, control mode optimization and the like.
Furthermore, anti-condensation measures of the steam supply main pipe are fully considered, a hot standby steam source can be provided for a long period all day long, and the island operation reliability of the unit is improved.
According to the system, the steam supply main pipe and the steam extraction main pipe are arranged between the molten salt energy storage module and the conventional thermal power generation system, so that the multi-path steam sources are reasonably distributed, the equipment transformation cost can be reduced, the steam sources with different differences are mixed and then sent to the heat exchange equipment, the different steam sources can be more reasonably applied, and the heat exchange efficiency is improved.
Drawings
Fig. 1 is a system diagram for realizing isolated island operation of a thermal power generating unit by coupling molten salt energy storage.
In the figure: 1-boiler, 2-turbine high-pressure cylinder, 3-turbine intermediate-pressure cylinder, 4-turbine low-pressure cylinder, 5-generator, 6-condenser, 7-deaerator, 8-water supply pump, 9-final-stage high-pressure heater, 10-low-temperature molten salt storage tank, 11-high-temperature molten salt storage tank, 12, 16-molten salt pump, 13-first molten salt heat exchanger, 14-second molten salt heat exchanger, 15-electric heater, 17-third molten salt heat exchanger, 18-fourth molten salt heat exchanger, 19-steam trap, 30-high-pressure bypass valve, 31-first check valve, 32-second check valve, 35-third check valve, 37-fourth check valve, 40-fifth check valve, 33-cold section to steam extraction main pipe regulating valve, 34-water supply regulating valve, 36-steam supply regulating valve, 38-steam extraction regulating valve, 39-condensation preventing regulating valve, 41-intermediate pressure cylinder steam exhaust valve, 42-heating regulating valve, 43-first control valve, 44-second control valve; a-steam supply main pipe and B-steam extraction main pipe
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, a system for realizing an island operation function of a thermal power generating unit by coupling molten salt energy storage comprises an existing thermal power generation system, a molten salt energy storage module and a steam extraction and steam supply pipeline, wherein the existing thermal power generation system comprises a typical boiler 1, a steam turbine high-pressure cylinder 2, a steam turbine intermediate-pressure cylinder 3, a steam turbine low-pressure cylinder 4, a generator 5, a condenser 6, a deaerator 7, a water supply pump 8, a multi-stage high-pressure heater, a high-pressure bypass valve 30 and an intermediate-pressure cylinder exhaust valve 41; the system comprises a boiler 1, a turbine high-pressure cylinder 2, a turbine intermediate-pressure cylinder 3, a turbine low-pressure cylinder 4, a generator 5, a condenser 6, a deaerator 7, a water feed pump 8 and a multistage high-pressure heater which are sequentially connected, wherein a final-stage heater 9 in the multistage high-pressure heater is connected with a water feed inlet of the boiler 1, and a molten salt energy storage module comprises a high-temperature molten salt storage tank 11, a low-temperature molten salt storage tank 10, a high-temperature molten salt pump 16, a low-temperature molten salt pump 12, a molten salt heat exchanger, an electric heater 15 and the like; the fused salt heat exchanger is including setting up third fused salt heat exchanger 17 and the fourth fused salt heat exchanger on high temperature fused salt storage tank 11 to low temperature fused salt storage tank 10 route, third fused salt heat exchanger 17 and fourth fused salt heat exchanger establish ties, and set up first fused salt heat exchanger 13 and second fused salt heat exchanger 14 on low temperature fused salt storage tank 10 to high temperature fused salt storage tank 11 route, first fused salt heat exchanger 13 and second fused salt heat exchanger 14 establish ties, steam extraction supplies vapour pipe-line system including supplying vapour female pipe A, steam extraction female pipe B, supply vapour governing valve 36, prevent condensation governing valve 39, steam extraction governing valve 38, steam trap 19 and check valve etc..
The steam extraction main pipe is connected with a heat absorption loop of the molten salt energy storage module, and the heat absorption loop is also connected with a condenser 6 and a deaerator 7 of the thermal power generation system; the superheated steam outlet of the fused salt energy storage module is sequentially connected with a steam supply main pipe and the inlet of a steam turbine intermediate pressure cylinder of the existing thermal power generation system, a final stage high-pressure heater 9 of the existing thermal power generation system is connected with a heat release loop of the fused salt energy storage module, a valve rear pipeline of a high-pressure bypass valve 30 in the existing thermal power generation system is connected with a steam extraction main pipe, and a valve front pipeline of an intermediate pressure cylinder steam exhaust valve 41 is connected with the steam extraction main pipe; and the reheating hot section steam pipeline is also connected with a heat absorption loop of the molten salt energy storage module.
The molten salt energy storage module comprises a low-temperature molten salt storage tank 10 and a high-temperature molten salt storage tank 11, a pipeline from the low-temperature molten salt storage tank 10 to the high-temperature molten salt storage tank 11 is a heat absorption loop, a low-temperature molten salt pump 12, a first molten salt heat exchanger 13, a second molten salt heat exchanger 14 and an electric heater 15 are sequentially arranged in the heat absorption loop along the molten salt flow direction, a pipeline from the high-temperature molten salt storage tank 11 to the low-temperature molten salt storage tank 10 is a heat release loop, and a high-temperature molten salt pump 16, a third molten salt heat exchanger 17 and a fourth molten salt heat exchanger 18 are sequentially arranged in the heat release loop along the molten salt flow direction; an outlet of the steam extraction main pipe is connected with a hot-side inlet of the first molten salt heat exchanger 13, and a hot-side outlet of the first molten salt heat exchanger 13 is connected with the condenser 6 and/or the deaerator 7; regulating valves are arranged from the hot side outlet of the first molten salt heat exchanger 13 to the condenser 6 and the deaerator 7 and are controlled in an interlocking manner; the reheating hot section steam pipeline is connected with a hot side inlet of the second molten salt heat exchanger 14, a hot side outlet of the second molten salt heat exchanger 14 is connected with a steam extraction main pipe inlet, and a check valve and a pneumatic regulating valve are sequentially arranged from the reheating hot section steam pipeline to the hot side inlet of the second molten salt heat exchanger 14; the outlet of the last stage high pressure heater 9 is connected to the cold side entry of fourth fused salt heat exchanger 18, and the cold side exit linkage of third fused salt heat exchanger 17 supplies the female pipe of vapour, supplies to set gradually check valve and electric control valve on the pipeline of female pipe to steam turbine intermediate pressure cylinder 3 import.
The steam supply main pipe is further connected with a hot side inlet of the second molten salt heat exchanger 14, a pneumatic regulating valve and a check valve are sequentially arranged from the steam supply main pipe to the hot side inlet of the second molten salt heat exchanger 14, and a steam trap 19 is arranged on a pipeline from the steam supply main pipe to the steam turbine intermediate pressure cylinder 3.
In the existing thermal power generation system, a path of steam is led out from a pipeline (namely a reheating cold section pipeline) behind a high-pressure bypass valve 30, and is sent into a steam extraction main pipe after passing through a second check valve 32 and a cold section to a steam extraction main pipe regulating valve 33; leading out a path of steam from the front of a valve of a steam exhaust valve 41 of the intermediate pressure cylinder of the steam exhaust pipeline of the intermediate pressure cylinder and sending the steam into a steam extraction main pipe; part of the reheated hot section steam is extracted and enters the second molten salt heat exchanger 14 through a fourth check valve 37 and an extraction regulating valve 38, and the steam after heat exchange is discharged to an extraction main pipe.
The three steam flows entering the steam extraction main pipe are mixed and then sent to the first molten salt heat exchanger 13 to release heat, the low-grade steam after heat release is discharged to the deaerator 7 under normal working conditions, and when the deaerator 7 is subjected to abnormal working conditions such as water level abnormality or pressure limitation, the low-grade steam is discharged to the condenser 6.
The extracted part of the feed water at the outlet of the final-stage high-pressure heater 9 sequentially enters a fourth molten salt heat exchanger 18 and a third molten salt heat exchanger 17 to absorb heat, and the absorbed heat is changed into high-grade steam which enters a steam supply main pipe; after the FCB occurs, steam in the steam supply main pipe is sent to an inlet of the steam turbine intermediate pressure cylinder 3 through the third check valve 35 and the steam supply adjusting valve 36, stable operation of 3000r/min service load of the steam turbine set is maintained, and stable island operation is achieved.
In order to ensure that the steam of the steam supply main pipe is always in a hot standby working condition, a steam is led out from the bottom of the tail end of the steam supply main pipe, is connected with the fifth check valve 40 through an anti-condensation regulating valve 39, and enters the steam side of the second molten salt heater 14 after being mixed with the steam from the hot re-pipeline; meanwhile, a steam trap is arranged at the steam supply main pipe to the hot secondary pipeline close to the steam inlet side of the medium pressure cylinder, and condensed water is drained in time.
An operation method for realizing the islanding operation of a thermal power generating unit by coupling molten salt energy storage comprises the following steps:
the steam storage method in the normal operation stage comprises the following steps:
part of high-temperature feed water extracted from the water side outlet of the final-stage high-pressure heater 9 is sent into the fourth molten salt heat exchanger 18 to absorb heat to generate saturated steam, the generated saturated steam is sent into the third molten salt heat exchanger 17 again to absorb heat to generate superheated steam, the generated superheated steam is finally sent to a steam supply main pipe, and the pressure is gradually increased to enable the parameters of the steam supply main pipe to meet the steam inlet parameter set value p of the intermediate pressure cylinder under the FCB working condition set 。
The anti-condensation method of the steam supply main pipe comprises the following steps:
when the pressure p of the steam supply main pipe A Lower than the set value p of the steam supply main pipe set In the process, the anti-condensation regulating valve maintains 5 percent of the minimum opening degree and keeps unchanged;
when the pressure p of the steam supply main pipe A Higher than the set value p of the steam supply main pipe set During the process, the anti-condensation regulating valve is automatically put into operation, and the pressure value of the steam supply main pipe is regulated to be p set ；
When the temperature before the steam trap is lower than p A And when the corresponding saturation temperature is reached, the condensation alarm device gives out sound and light alarm.
The molten salt heating method in the operation stage comprises the following steps:
and starting the low-temperature molten salt pump 12, establishing molten salt working medium circulation, and enabling the molten salt from the low-temperature molten salt storage tank 10 to firstly enter the first molten salt heat exchanger 13 to exchange heat with the steam from the steam extraction main pipe B. Steam after releasing heat gets into oxygen-eliminating device 8 under normal operating mode, and when 8 water levels of oxygen-eliminating device exceeded the alarm value or oxygen-eliminating device pressure exceeded the alarm value, this strand of steam got into the oxygen-eliminating device of shutting, chain opening to the valve of condenser this moment.
The molten salt working medium entering the second molten salt heat exchanger 14 exchanges heat with the heat re-steam from extraction, the steam after releasing heat enters the steam extraction main pipe B, the molten salt after absorbing heat enters the molten salt electric heater 15 to raise the temperature again, and finally the molten salt raised to the set temperature enters the high-temperature molten salt tank.
The FCB working condition triggered operation method comprises the following steps:
after the FCB acts, the pneumatic valve 44 from the first molten salt heat exchanger 13 to the deaerator 7 is closed in a linkage mode, and the pneumatic valve 43 from the first molten salt heat exchanger 13 to the condenser 43 is opened in a linkage mode;
after the FCB acts, the cold section from the reheating cold section pipeline to the steam extraction main pipe B is automatically opened to the steam extraction main pipe regulating valve 33, and high-temperature steam entering the cold re-pipeline through a high bypass is quickly released;
after FCB action, after time delay of delta t seconds, the valves comprising an extraction steam regulating valve 38 from a reheating thermal section to the second molten salt heater 14, a heating regulating valve 42 from an intermediate pressure cylinder steam exhaust pipeline to an extraction steam main pipe B and a feed water regulating valve 34 from an outlet of the final stage high-pressure heater 9 to the fourth molten salt heater 18 are closed in a linkage manner, and delta t is confirmed according to thermal inertia and test results of different units.
After the FCB acts, the steam turbine set is switched from a power control mode to a rotating speed control mode, and the steam turbine is switched from a combined steam inlet mode to a medium pressure cylinder steam inlet mode, so that the rotating speed of the steam turbine set is quickly stabilized; after the rotating speed of the unit is stable, steam can be provided through the steam supply main pipe, and the isolated island operation of the steam turbine is maintained.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A method for realizing the island operation of a thermal power generating unit by coupling molten salt energy storage is characterized in that after FCB is triggered, a steam turbine unit is switched from a power control mode to a rotating speed control mode, and a steam turbine is switched from a combined steam admission mode to a medium pressure cylinder steam admission mode; after the rotating speed of the unit is stable, steam can be provided through the molten salt energy storage module to maintain the isolated island operation of the steam turbine;
after the FCB acts, the pipeline from the molten salt energy storage module to the deaerator (7) is automatically closed, and the pipeline from the molten salt energy storage module to the condenser (6) is opened in a linkage manner; the molten salt energy storage module recovers the heat of main steam entering a reheating cold section pipeline through a high-pressure bypass; after the FCB is triggered, the delivery of reheating hot section steam, intermediate pressure cylinder steam exhaust and boiler water supply to the molten salt energy storage module is stopped after a delay of delta t seconds; and delta t is confirmed according to the thermal inertia and FCB dynamic test results of different units.
2. The method for realizing the island operation of the thermal power generating unit by coupling the molten salt energy storage according to claim 1, is characterized in that the method for storing the steam in the normal operation stage comprises the following steps: supplying water to the molten salt energy storage module from the last-stage high water adding side, wherein the water is converted into superheated steam after absorbing heat in the molten salt system, the generated superheated steam is finally sent to a steam supply main pipe of the molten salt energy storage module, and the steam is gradually boosted to meet the steam inlet parameter set value p of the intermediate pressure cylinder under the FCB working condition set 。
3. The method for realizing the island operation of the thermal power generating unit by coupling the molten salt energy storage according to claim 1, wherein the method for preventing condensation of the steam supply main pipe of the molten salt energy storage module comprises the following steps: when the pressure p of the steam supply main pipe of the molten salt energy storage module A Is lower than the set value p of the steam supply main pipe of the molten salt energy storage module set When the air conditioner is in use, the anti-condensation regulating valve maintains 5% of the lowest opening degree and keeps unchanged;
when the pressure p of the steam supply main pipe A Higher than the set value p of the steam supply main pipe set During the process, the anti-condensation regulating valve is automatically put into operation, and the pressure value of the steam supply main pipe is regulated to be p set ；
When the pre-trap temperature is below p A And when the corresponding saturation temperature is reached, the condensation alarm device gives out sound and light alarm.
4. The method for realizing the island operation of the thermal power generating unit by coupling the molten salt energy storage according to claim 1, wherein the molten salt heating in the operation stage is specifically as follows: after the fused salt energy storage module exchanges heat with the extraction steam of the existing thermal power generation system, the temperature of the fused salt energy storage module is further raised through an electric heater to store heat in the fused salt, the fused salt energy storage module enters a deaerator under the normal working condition after the extraction steam releases heat, and the fused salt energy storage module enters a condenser under the FCB action working condition.
5. A thermal power generating unit island operation system achieved by coupling molten salt energy storage is characterized by comprising an existing thermal power generation system, a steam extraction main pipe, a steam supply main pipe and a molten salt energy storage module; the steam extraction main pipe is connected with a heat absorption loop of the molten salt energy storage module, and the heat absorption loop is also connected with a condenser (6) and a deaerator (7) of the thermal power generation system; a superheated steam outlet of the fused salt energy storage module is sequentially connected with a steam supply main pipe and an inlet of a steam turbine intermediate pressure cylinder of the existing thermal power generation system, a final stage high-pressure heater (9) of the existing thermal power generation system is connected with a heat release loop of the fused salt energy storage module, a valve rear pipeline of a high-pressure bypass valve (30) in the existing thermal power generation system is connected with a steam extraction main pipe, and a valve front pipeline of an exhaust valve (41) of the intermediate pressure cylinder is connected with the steam extraction main pipe; and the reheating hot section steam pipeline is also connected with a heat absorption loop of the molten salt energy storage module.
6. The thermal power generating unit island operation system is realized through coupling molten salt energy storage according to claim 5, characterized in that the molten salt energy storage module comprises a low-temperature molten salt storage tank (10) and a high-temperature molten salt storage tank (11), a pipeline from the low-temperature molten salt storage tank (10) to the high-temperature molten salt storage tank (11) is an endothermic loop, a low-temperature molten salt pump (12), a first molten salt heat exchanger (13), a second molten salt heat exchanger (14) and an electric heater (15) are sequentially arranged in the endothermic loop along the molten salt flow direction, a pipeline from the high-temperature molten salt storage tank (11) to the low-temperature molten salt storage tank (10) is an exothermic loop, and a high-temperature molten salt pump (16), a third molten salt heat exchanger (17) and a fourth molten salt heat exchanger (18) are sequentially arranged in the exothermic loop along the molten salt flow direction.
7. The system for realizing the islanding operation of the thermal power generating unit by coupling the molten salt energy storage according to claim 6, wherein an outlet of a steam extraction main pipe is connected with a hot-side inlet of the first molten salt heat exchanger (13), and a hot-side outlet of the first molten salt heat exchanger (13) is connected with a condenser (6) or a deaerator (7); shut-off valves are arranged from the hot side outlet of the first molten salt heat exchanger (13) to the condenser (6) and the deaerator (7), and are in interlocking control with each other; the reheating hot section steam pipeline is connected with a hot side inlet of the second molten salt heat exchanger (14), a hot side outlet of the second molten salt heat exchanger (14) is connected with a steam extraction main pipe inlet, and a check valve and a pneumatic regulating valve are sequentially arranged from the reheating hot section steam pipeline to the hot side inlet of the second molten salt heat exchanger (14).
8. The system for realizing the islanding operation of the thermal power generating unit by coupling the molten salt energy storage according to claim 6, wherein a cold side inlet of a fourth molten salt heat exchanger (18) is connected with an outlet of a final-stage high-pressure heater (9), a cold side outlet of a third molten salt heat exchanger (17) is connected with a steam supply main pipe, and a check valve and a steam extraction regulating valve are sequentially arranged on a pipeline from the steam supply main pipe to an inlet of a steam turbine intermediate pressure cylinder (3).
9. The system for realizing the islanding operation of the thermal power generating unit by coupling the molten salt energy storage according to claim 5, wherein the steam supply main pipe is further connected with a hot side inlet of the second molten salt heat exchanger (14), and a pneumatic regulating valve and a check valve are sequentially arranged from the steam supply main pipe to the hot side inlet of the second molten salt heat exchanger (14); a steam trap (19) is arranged on a pipeline from the steam supply main pipe to the steam turbine intermediate pressure cylinder (3) and is used for preventing condensation and ensuring that the steam supply main pipe is always in a hot standby state.
10. The system for realizing the island operation of the thermal power generating unit by coupling the molten salt energy storage according to claim 5, wherein a heating regulating valve is arranged between a valve front pipeline of a steam exhaust valve (41) of the intermediate pressure cylinder and a steam extraction main pipe.
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