CN114811552B - CO (carbon monoxide)2Heat pump-molten salt heat storage cascade steam supply system and steam supply method - Google Patents
CO (carbon monoxide)2Heat pump-molten salt heat storage cascade steam supply system and steam supply method Download PDFInfo
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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
- 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
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
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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
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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
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
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Abstract
The invention belongs to the technical field of industrial steam supply, and particularly relates to a CO 2 heat pump-molten salt heat storage cascade steam supply system and a steam supply method. According to the CO 2 heat pump-molten salt heat storage cascade steam supply system provided by the invention, one path of supplied steam is preheated through the CO 2 heat pump device, and then is reheated through the arranged molten salt heat storage device, so that the medium-high pressure and large-flow steam supply requirements of an industrial steam unit can be ensured. Meanwhile, as the fused salt heat storage device stores heat for high-temperature steam, the heat storage cost is reduced while the flexibility peak regulation requirement of the thermal power unit is met. Furthermore, the CO 2 heat pump-fused salt heat storage cascade steam supply system uses CO 2 as a compression expansion circulation medium to store heat in combination with fused salt, so that coal resources are effectively saved, and environmental pollution is reduced.
Description
Technical Field
The invention belongs to the technical field of industrial steam supply, and particularly relates to a CO 2 heat pump-molten salt heat storage cascade steam supply system and a steam supply method.
Background
At present, the thermal power generating unit in China is used as the key energy position of the energy ballast, and the energy supply in regional energy is more important, and is mainly used for providing industrial steam supply for the region or industrial park where the thermal power plant is located. In the supply of external industrial steam, high-parameter, continuous guaranteed supply is of paramount importance, and the following difficulties exist in the current related art:
The flexibility peak regulation requirements of the first and thermal power units are larger and larger, the requirements of the flexibility policy are gradually reduced from the requirements of loads below 50% to 30% or even 20% of loads, and the requirements of the flexibility policy are very important in ensuring external continuous steam supply under low loads besides providing new technical requirements for the low-load safe operation of main and auxiliary machines of the thermal power units. However, under low load, the extraction pressure of each section is difficult to ensure, and the production of the park requires that the steam supply cannot be interrupted.
Secondly, the conventional molten salt energy storage system ensures the peak regulation and frequency modulation of the thermal power unit under the power plant load instruction, and the heat release and heat release processes meet the lifting load requirements of the unit, but the conventional molten salt heat storage system can only realize the low-pressure and low-flow steam supply requirements, and cannot realize the medium-pressure, high-pressure and high-flow steam supply requirements.
Disclosure of Invention
First, the technical problem to be solved
In order to solve the problems in the prior art, the invention provides the CO 2 heat pump-molten salt heat storage cascade steam supply system, which uses CO 2 as a compression expansion circulation medium and combines molten salt heat storage, thereby effectively saving coal resources, reducing environmental pollution and simultaneously realizing medium-pressure, high-pressure and high-flow steam supply requirements.
(II) technical scheme
In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:
The invention provides a CO 2 heat pump-fused salt heat storage cascade steam supply system, which comprises a steam turbine steam supply device, a fused salt heat storage and release device and a CO 2 heat pump steam supply device, wherein the steam turbine steam supply device is used for supplying steam to the fused salt heat storage and release device so as to store heat of the fused salt heat storage and release device, one path of desalted water is provided in the CO 2 heat pump steam supply device, the CO 2 heat pump steam supply device is used for heating the desalted water to form steam, the steam enters a preheating box for preheating again, and the fused salt heat storage and release device after heat storage is used for reheating the preheated steam.
The heat storage and release device comprises a molten salt steam drum, a molten salt superheater, a molten salt evaporator, a molten salt cold tank, a molten salt hot tank, a first molten salt heat exchanger and a second molten salt heat exchanger, wherein the steam turbine steam supply device is used for respectively providing steam for the first molten salt heat exchanger and the second molten salt heat exchanger to enable the molten salt heat storage and release device to store heat, the CO 2 heat pump steam supply device is communicated with a preheating tank through a first steam pipeline, the preheating tank is communicated with the molten salt steam drum through a first loop, the molten salt steam drum is communicated with the molten salt superheater through a second steam pipeline, the molten salt steam drum is used for providing preheated steam for the molten salt superheater, the molten salt evaporator is communicated with the molten salt steam drum through a second loop, the molten salt evaporator is used for providing heat for the molten salt steam drum, the molten salt cold tank is communicated with the first molten salt heat exchanger through a first pipeline, the molten salt cold tank is communicated with the second molten salt heat exchanger through a second pipeline, the first molten salt heat exchanger is communicated with the molten salt hot tank through a third pipeline, the second molten salt heat exchanger is communicated with the molten salt hot tank through a fourth pipeline, the molten salt hot tank is communicated with the molten salt hot tank through a fifth pipeline, the molten salt hot tank is communicated with the molten salt superheater is used for providing preheated for the molten salt superheater, and the heated by the molten salt evaporator through the second loop, and the steam evaporator is communicated with the evaporator through the seventh pipeline.
The CO 2 heat pump steam supply device comprises a first heat exchanger, a second heat exchanger, a compressor and an expansion valve, wherein the first heat exchanger is communicated with the second heat exchanger through a working medium loop, the compressor and the expansion valve are respectively arranged on the working medium loop, CO 2 working medium is communicated in the working medium loop, the first heat exchanger is communicated with a low-grade heat source to heat CO 2 working medium flowing through the first heat exchanger, the second heat exchanger is communicated with a first water inlet pipeline, the first water inlet pipeline is used for providing desalted water for the second heat exchanger, and the second heat exchanger is communicated with a preheating box through a first steam pipeline.
Preferably, the system further comprises a second water inlet pipeline, one end of the second water inlet pipeline is communicated with the first heat exchanger, and the other end of the second water inlet pipeline is used for communicating with a low-grade heat source.
Preferably, the heat exchanger further comprises a first water outlet pipeline, and the first heat exchanger is communicated with the first water outlet pipeline and is used for outputting the low-grade heat source after heat exchange.
The steam turbine steam supply device comprises a boiler, a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder and a steam turbine low-pressure cylinder, wherein the boiler is used for providing steam for the steam turbine high-pressure cylinder and the steam turbine medium-pressure cylinder through a first main steam pipeline and a second main steam pipeline respectively, the steam turbine medium-pressure cylinder is used for providing steam for the steam turbine low-pressure cylinder through a third main steam pipeline, the steam turbine steam supply device further comprises a first steam branch pipeline and a second steam branch pipeline, one end of the first steam branch pipeline is communicated with the first main steam pipeline, the other end of the first steam branch pipeline is communicated with the first molten salt heat exchanger, one end of the second steam branch pipeline is communicated with the second main steam pipeline, and the other end of the second steam branch pipeline is communicated with the second molten salt heat exchanger.
Preferably, the steam turbine steam supply device further comprises a fourth main steam pipeline, one end of the fourth main steam pipeline is communicated with a steam outlet of the high-pressure cylinder of the steam turbine, the other end of the fourth main steam pipeline is communicated with a steam inlet of the boiler, and the first molten salt heat exchanger is communicated with the fourth main steam pipeline through a third steam branch pipeline.
Preferably, the second molten salt heat exchanger is in communication with the third main steam line via a fourth steam branch conduit.
Preferably, a conduit pump is provided on the first steam line.
The invention also provides a CO 2 heat pump-molten salt heat storage cascade steam supply method, which comprises the following steps of;
s1, a steam supply device of a steam turbine supplies steam for a fused salt heat storage and release device so as to enable the fused salt heat storage and release device to store heat;
S2, providing one path of desalted water in the CO 2 heat pump steam supply device, heating the desalted water by the CO 2 heat pump steam supply device to form primary steam, and enabling the primary steam to enter a preheating box for preheating again to form secondary steam;
s3, the fused salt heat storage and release device after heat storage exchanges heat with the secondary steam to enable the secondary steam to form tertiary steam after heat exchange;
s4, three-stage steam is used for external supply.
(III) beneficial effects
The beneficial effects of the invention are as follows:
According to the CO 2 heat pump-molten salt heat storage cascade steam supply system provided by the invention, one path of supplied steam is preheated through the CO 2 heat pump device, and then is reheated through the arranged molten salt heat storage device, so that the medium-high pressure and large-flow steam supply requirements of an industrial steam unit can be ensured. Meanwhile, as the fused salt heat storage device stores heat for high-temperature steam, the heat storage cost is reduced while the flexibility peak regulation requirement of the thermal power unit is met. Furthermore, the CO 2 heat pump-fused salt heat storage cascade steam supply system uses CO 2 as a compression expansion circulation medium to store heat in combination with fused salt, so that coal resources are effectively saved, and environmental pollution is reduced.
According to the CO 2 heat pump-molten salt heat storage cascade steam supply method provided by the embodiment, the desalted water can be heated in a three-stage cascade mode, so that the middle-high pressure and large-flow steam supply requirements of an industrial steam unit can be met by fully utilizing the molten salt heat storage and release device.
Drawings
Fig. 1 is a schematic diagram of a CO 2 heat pump-molten salt heat storage cascade steam supply system provided by the invention.
[ Reference numerals description ]
1, A fused salt steam drum; 2, a molten salt superheater; the method comprises the steps of 3, namely a molten salt evaporator, 4, a molten salt cooling tank, 5, 6, a first molten salt heat exchanger, 7, a second molten salt heat exchanger, 8, a first steam pipeline, 9, a preheating box, 10, a first loop, 11, a second steam pipeline, 12, a second loop, 13, a first pipeline, 14, a second pipeline, 15, a third pipeline, 16, a fourth pipeline, 17, a fifth pipeline, 18, a sixth pipeline, 19, a seventh pipeline, 20, a first heat exchanger, 21, a second heat exchanger, 22, a compressor, 23, an expansion valve, 24, a working medium loop, 25, a first water inlet pipeline, 26, a second water inlet pipeline, 27, a first water outlet pipeline, 28, a boiler, 29, 30, a steam turbine medium pressure cylinder, 31, 32, 33, a second main steam pipeline, 34, a fourth main steam pipeline, 35, 36, 37, a third main steam pipeline, 40, a third main steam pipeline, and a fourth steam pipeline, 42.
Detailed Description
In order that the above-described aspects may be better understood, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
As shown in FIG. 1, the CO 2 heat pump-molten salt heat storage cascade steam supply system provided by the invention comprises a steam turbine steam supply device, a molten salt heat storage and release device and a CO 2 heat pump steam supply device.
The steam turbine steam supply device is used for providing steam for the fused salt heat storage and release device so that the fused salt heat storage and release device stores heat, one path of desalted water is provided in the CO2 heat pump steam supply device, the CO2 heat pump steam supply device is used for heating the desalted water to form steam, the steam enters the preheating box 9 for preheating again, and the fused salt heat storage and release device after heat storage is used for reheating the preheated steam.
According to the CO 2 heat pump-molten salt heat storage cascade steam supply system provided by the embodiment, one path of provided steam is preheated through the CO 2 heat pump device, and then is reheated through the arranged molten salt heat storage device, so that cascade heating is realized, and the medium-pressure, high-pressure and high-flow steam supply requirements of an industrial steam unit can be met. Meanwhile, as the fused salt heat storage device stores heat for high-temperature steam, the heat storage cost is reduced while the flexibility peak regulation requirement of the thermal power unit is met. Furthermore, the CO 2 heat pump-fused salt heat storage cascade steam supply system uses CO 2 as a compression expansion circulation medium to store heat in combination with fused salt, so that coal resources are effectively saved, and environmental pollution is reduced.
The molten salt heat storage and release device comprises a molten salt steam drum 1, a molten salt superheater 2, a molten salt evaporator 3, a molten salt cooling tank 4, a molten salt heating tank 5, a first molten salt heat exchanger 6 and a second molten salt heat exchanger 7.
The steam supply device of the steam turbine is used for respectively providing steam for the first molten salt heat exchanger 6 and the second molten salt heat exchanger 7 so as to enable the molten salt heat storage and release device to store heat. The CO 2 heat pump steam supply device is communicated with the preheating tank 9 through a first steam pipeline 8, the preheating tank 9 is communicated with the molten salt steam drum 1 through a first loop 10, the molten salt steam drum 1 is communicated with the molten salt superheater 2 through a second steam pipeline 11, the molten salt steam drum 1 is used for providing preheated steam for the molten salt superheater 2, the molten salt evaporator 3 is communicated with the molten salt steam drum 1 through a second loop 12, the molten salt cooling tank 4 is communicated with the first molten salt heat exchanger 6 through a first pipeline 13, the molten salt cooling tank 4 is communicated with the second molten salt heat exchanger 7 through a second pipeline 14, the first molten salt heat exchanger 6 is communicated with the molten salt heat tank 5 through a third pipeline 15, the second molten salt heat exchanger 7 is communicated with the molten salt heat tank 5 through a fourth pipeline 16, the molten salt heat tank 5 is communicated with the molten salt superheater 2 through a fifth pipeline 17 and is used for providing heat for the molten salt superheater 2 to reheat the preheated steam in the molten salt superheater 2, the molten salt superheater 2 is communicated with the molten salt evaporator 3 through a sixth pipeline 18, and the molten salt evaporator 3 is communicated with the molten salt cooling tank 4 through a seventh pipeline 19. The preheating box 9 preheats the steam output by the CO 2 heat pump steam supply device again, so that the temperature of the steam is increased in a step mode.
In the molten salt heat storage and release device, ternary salt is stored in the molten salt cooling tank 4, and enters the first molten salt heat exchanger 6 through the first pipeline 13 by the molten salt pump, absorbs steam heat, and the heated ternary salt enters the molten salt heating tank 5 through the third pipeline 15. Ternary salt stored in the molten salt cooling tank 4 enters the second molten salt heat exchanger 7 through the second pipeline 14 by a molten salt pump, absorbs steam heat, and the heated ternary salt enters the molten salt heating tank 5 through the fourth pipeline 16. The 360 ℃ ternary salt stored in the molten salt heat tank 5 enters the molten salt superheater 2 through the fifth pipeline 17 to perform molten salt-steam heat exchange, the ternary salt after heat exchange enters the molten salt evaporator 3 through the sixth pipeline 18, and the ternary salt after heat exchange in the molten salt evaporator 3 enters the molten salt cooling tank 4 through the seventh pipeline 19, so that circulation in a molten salt system is completed.
Wherein, fused salt evaporator 3 communicates with fused salt steam drum 1 through second circuit 12, and fused salt evaporator 3 is used for providing heat for fused salt steam drum 1. The second loop 12 is used for sending liquid water formed after heat release of the vapor-liquid separation device in the molten salt steam drum 1 into the molten salt evaporator 3, sending steam formed by heating of the molten salt evaporator 3 back into the molten salt steam drum 1, providing steam for the molten salt steam drum 1 by the molten salt evaporator 3, enabling the water after vapor-liquid separation of the molten salt steam drum 1 to enter the molten salt evaporator 3 to continuously absorb heat and change into steam to return to the molten salt steam drum 1, and further enabling heat to be better utilized.
Specifically, the CO 2 heat pump steam supply device includes a first heat exchanger 20, a second heat exchanger 21, a compressor 22, and an expansion valve 23. The first heat exchanger 20 is communicated with the second heat exchanger 21 through a working medium loop 24, the compressor 22 and the expansion valve 23 are respectively arranged on the working medium loop 24, a CO 2 working medium is introduced into the working medium loop 24, the first heat exchanger 20 is communicated with a low-grade heat source to heat the CO 2 working medium flowing through the first heat exchanger 20, the second heat exchanger 21 is communicated with the first water inlet pipeline 25, and the second heat exchanger 21 is communicated with the preheating box 9 through the first steam pipeline 8. In this embodiment, in order to further reduce environmental pollution and realize zero carbon emission, the driving source of the CO 2 heat pump steam supply device is a photovoltaic power station, and the photovoltaic power station drives the compressor 22 through a transformer. The demineralized water enters the second heat exchanger 21 through the first water inlet pipeline 25 to exchange heat and then generates steam to enter the first steam pipeline 8, and in the practical application process, a pipeline pump 42 is arranged on the first steam pipeline 8 to adjust the steam flow output from the first steam pipeline 8 to the preheating box 9.
In this embodiment, the CO 2 heat pump-molten salt heat storage cascade steam supply system further includes a second water inlet pipeline 26 and a first water outlet pipeline 27, the second water inlet pipeline 26 is communicated with the first heat exchanger 20, and the other end of the second water inlet pipeline 26 is used for low-grade heat source communication. The first heat exchanger 20 is communicated with a first water outlet pipeline 27 and is used for outputting a low-grade heat source after heat exchange. In this embodiment, the low-grade heat source is low-grade waste heat in circulating water of the thermal power generating unit, the water temperature of the circulating water entering the inlet of the second water inlet pipeline 26 is 35 ℃, and the temperature of the circulating water discharged from the first water outlet pipeline 27 is 20 ℃. The first heat exchanger 20 heats the CO 2 working fluid in the working fluid circuit 24 passing therethrough for providing heat to the second heat exchanger 21 to heat the demineralized water. In this embodiment, the desalinated water of 200t/h and 20 ℃ is led from the water treatment system to the first heat exchanger 20 through the first water inlet pipeline 25. The saturated steam temperature heated to the corresponding pressure in the first heat exchanger 20, such as 0.4Mpa-0.5Mpa according to the pressure of the desalting water pipeline of the 330MW unit, can be heated to about 150 ℃.
The design of the demineralized water pressure can be according to the actual demand of industrial steam supply pressure, the steam supply pressure can be designed according to 1.6Mpa for the demand of medium-pressure industrial steam, and the demand of high-pressure industrial steam can be designed according to the pressure above 2.0Mpa, and the pressure can be increased to 2.2-2.6Mpa by adjusting the pipeline pump 42 in the embodiment.
Specifically, the turbine steam supply device includes a boiler 28, a turbine high pressure cylinder 29, a turbine intermediate pressure cylinder 30, and a turbine low pressure cylinder 31. The boiler 28 provides steam for the steam turbine high pressure cylinder 29 and the steam turbine medium pressure cylinder 30 through a first main steam pipeline 32 and a second main steam pipeline 33 respectively, the steam turbine medium pressure cylinder 30 provides steam for the steam turbine low pressure cylinder 31 through a third main steam pipeline 37, the steam turbine steam supply device further comprises a first steam branch pipeline 35 and a second steam branch pipeline 36, one end of the first steam branch pipeline 35 is communicated with the first main steam pipeline 32, the other end of the first steam branch pipeline 35 is communicated with the first molten salt heat exchanger 6 for providing high-temperature steam for the first molten salt heat exchanger 6, one end of the second steam branch pipeline 36 is communicated with the second main steam pipeline 33, and the other end of the second steam branch pipeline 36 is communicated with the second molten salt heat exchanger 7 for providing steam for the second molten salt heat exchanger 7. Of course, a first valve 40 is provided on the first steam branch 35 and a second valve 41 is provided on the second steam branch 36 to regulate the amount of steam input.
In this embodiment, the steam turbine steam supply device further includes a fourth main steam pipe 34, one end of the fourth main steam pipe 34 is communicated with the steam outlet of the steam turbine high pressure cylinder 29, the other end of the fourth main steam pipe 34 is communicated with the steam inlet of the boiler 28, and the first molten salt heat exchanger 6 is communicated with the fourth main steam pipe 34 through a third steam branch pipe 38. The second molten salt heat exchanger 7 communicates with a third main steam line 37 via a fourth steam branch line 39. By arranging the third steam branch pipeline 38, the steam after the heat release of the molten salt system still returns to the reheater of the boiler 28, the reheat steam temperature and the reheater wall temperature of the boiler 28 are not influenced, and the fourth steam branch pipeline 39 is arranged, the steam extracted again from the heat of the boiler 28 is ensured, the steam still returns to the middle pressure cylinder 30 of the steam turbine to do work after the heat release of the molten salt storage and release device, the energy is utilized to the maximum extent, and the extracted steam returns to the low pressure cylinder 31 of the steam turbine to continue to do work without damaging the steam-water balance of the original boiler-steam turbine, so that the stable operation of a unit is not influenced in the heat absorption and heat release process of the molten salt system.
Example two
The embodiment provides a CO 2 heat pump-molten salt heat storage cascade steam supply method by utilizing the CO 2 heat pump-molten salt heat storage cascade steam supply system in the first embodiment, which comprises the following steps of;
s1, a steam supply device of a steam turbine supplies steam for a fused salt heat storage and release device so as to enable the fused salt heat storage and release device to store heat;
S2, providing one path of desalted water in the CO 2 heat pump steam supply device, heating the desalted water by the CO 2 heat pump steam supply device to form primary steam, and enabling the primary steam to enter a preheating box for preheating again to form secondary steam;
s3, the fused salt heat storage and release device after heat storage exchanges heat with the secondary steam to enable the secondary steam to form tertiary steam after heat exchange;
s4, three-stage steam is used for external supply.
According to the CO 2 heat pump-molten salt heat storage cascade steam supply method provided by the embodiment, the desalted water can be heated in a three-stage cascade mode, so that the middle-high pressure and large-flow steam supply requirements of an industrial steam unit can be met by fully utilizing the molten salt heat storage and release device.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature, which may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is level lower than the second feature.
In the description of the present specification, the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the invention.
Claims (6)
1. The CO 2 heat pump-molten salt heat storage cascade steam supply system is characterized by comprising a steam turbine steam supply device, a molten salt heat storage and release device and a CO 2 heat pump steam supply device;
the steam supply device of the steam turbine is used for providing steam for the fused salt heat storage and release device so as to store heat for the fused salt heat storage and release device;
Providing one path of desalted water in a CO 2 heat pump steam supply device, wherein the CO 2 heat pump steam supply device is used for heating the desalted water to form steam, and enabling the steam to enter a preheating box for preheating again;
the molten salt heat storage and release device after heat storage is used for reheating the preheated steam;
the molten salt heat storage and release device comprises a molten salt steam drum, a molten salt superheater, a molten salt evaporator, a molten salt cold tank, a molten salt hot tank, a first molten salt heat exchanger and a second molten salt heat exchanger;
the steam supply device of the steam turbine respectively provides steam for the first molten salt heat exchanger and the second molten salt heat exchanger so as to enable the molten salt heat storage and release device to store heat;
The CO 2 heat pump steam supply device is communicated with a preheating box through a first steam pipeline, and the preheating box is communicated with the molten salt steam drum through a first loop;
The molten salt steam drum is communicated with the molten salt superheater through a second steam pipeline, the molten salt steam drum is used for providing preheated steam for the molten salt superheater, the molten salt evaporator is communicated with the molten salt steam drum through a second loop, and the molten salt evaporator is used for providing heat for the molten salt steam drum;
The molten salt cooling tank is communicated with the first molten salt heat exchanger through a first pipeline, the molten salt cooling tank is communicated with the second molten salt heat exchanger through a second pipeline, the first molten salt heat exchanger is communicated with the molten salt heating tank through a third pipeline, and the second molten salt heat exchanger is communicated with the molten salt heating tank through a fourth pipeline;
The molten salt heat tank is communicated with the molten salt superheater through a fifth pipeline and is used for providing heat for the molten salt superheater so as to reheat the preheated steam in the molten salt superheater, the molten salt superheater is communicated with the molten salt evaporator through a sixth pipeline, and the molten salt evaporator is communicated with the molten salt cold tank through a seventh pipeline;
The steam turbine steam supply device comprises a boiler, a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder and a steam turbine low-pressure cylinder;
The boiler provides steam for the high-pressure cylinder of the steam turbine and the medium-pressure cylinder of the steam turbine through a first main steam pipeline and a second main steam pipeline respectively, and the medium-pressure cylinder of the steam turbine provides steam for the low-pressure cylinder of the steam turbine through a third main steam pipeline;
The steam turbine steam supply device further comprises a first steam branch pipeline and a second steam branch pipeline;
One end of the first steam branch pipeline is communicated with the first main steam pipeline, and the other end of the first steam branch pipeline is communicated with the first molten salt heat exchanger;
one end of the second steam branch pipeline is communicated with the second main steam pipeline, and the other end of the second steam branch pipeline is communicated with the second molten salt heat exchanger;
the steam supply device of the steam turbine further comprises a fourth main steam pipeline, one end of the fourth main steam pipeline is communicated with a steam outlet of the high-pressure cylinder of the steam turbine, and the other end of the fourth main steam pipeline is communicated with a steam inlet of the boiler;
The first molten salt heat exchanger is communicated with the fourth main steam pipeline through a third steam branch pipeline;
The second molten salt heat exchanger is communicated with a third main steam pipeline through a fourth steam branch pipeline.
2. The CO 2 heat pump-molten salt heat storage cascade steam supply system as set forth in claim 1, wherein the CO 2 heat pump steam supply device comprises a first heat exchanger, a second heat exchanger, a compressor and an expansion valve;
The first heat exchanger is communicated with the second heat exchanger through a working medium loop, the compressor and the expansion valve are respectively arranged on the working medium loop, a CO 2 working medium is communicated in the working medium loop, and the first heat exchanger is communicated with a low-grade heat source to heat the CO 2 working medium flowing through the first heat exchanger;
The second heat exchanger is communicated with a first water inlet pipeline, the first water inlet pipeline is used for providing desalted water for the second heat exchanger, and the second heat exchanger is communicated with the preheating box through a first steam pipeline.
3. The CO 2 heat pump-molten salt heat storage cascade steam supply system as set forth in claim 2, further comprising a second water inlet pipeline, wherein one end of the second water inlet pipeline is communicated with the first heat exchanger, and the other end of the second water inlet pipeline is used for communicating with the low-grade heat source.
4. The CO 2 heat pump-molten salt heat storage cascade steam supply system as set forth in claim 3, further comprising a first water outlet pipeline, wherein the first heat exchanger is communicated with the first water outlet pipeline and is used for outputting the low-grade heat source after heat exchange.
5. The CO 2 heat pump-molten salt heat storage cascade steam supply system as set forth in claim 1, wherein a pipeline pump is arranged on the first steam pipeline.
6. A CO 2 heat pump-fused salt heat storage cascade steam supply method is characterized in that the CO 2 heat pump-fused salt heat storage cascade steam supply system as set forth in any one of claims 1-5 is adopted, and the method comprises the following steps;
s1, a steam supply device of a steam turbine provides steam for a fused salt heat storage and release device so that the fused salt heat storage and release device stores heat;
S2, providing one path of desalted water in the CO 2 heat pump steam supply device, heating the desalted water by the CO 2 heat pump steam supply device to form primary steam, and preheating the primary steam again by entering a preheating box to form secondary steam;
S3, the fused salt heat storage and release device after heat storage exchanges heat with the secondary steam to enable the secondary steam to form tertiary steam after heat exchange;
S4, the three-stage steam is used for external supply.
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