CN214664318U - Fused salt energy storage power station system - Google Patents

Fused salt energy storage power station system Download PDF

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Publication number
CN214664318U
CN214664318U CN202120840176.3U CN202120840176U CN214664318U CN 214664318 U CN214664318 U CN 214664318U CN 202120840176 U CN202120840176 U CN 202120840176U CN 214664318 U CN214664318 U CN 214664318U
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heat exchanger
molten salt
vapor
energy storage
boiler
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杨天亮
田欢
杜永斌
牛涛
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Yantai Longyuan Power Technology Co Ltd
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Yantai Longyuan Power Technology Co Ltd
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Abstract

The utility model discloses a fused salt energy storage power station system, which comprises a cold fused salt tank, a cold fused salt pump, a vapor-liquid heat exchanger, a hot fused salt tank, a hot fused salt pump, a heat exchanger group, a steam turbine generator set and a boiler; the cold molten salt tank, the cold molten salt pump, the vapor-liquid heat exchanger, the hot molten salt tank, the hot molten salt pump and the heat exchanger group are sequentially connected; the boiler is connected with the vapor-liquid heat exchanger so that the vapor provided by the boiler heats the molten salt passing through the vapor-liquid heat exchanger; and high-pressure feed water is converted into steam through the heat exchanger set and then supplied to the steam turbine generator set for power generation. The utility model provides a unit flexibility is higher, and the frequency modulation performance is higher, and unit load control range is wide, and the generating efficiency is high, and fail safe nature and economic nature are higher fused salt energy storage power station system.

Description

Fused salt energy storage power station system
Technical Field
The utility model relates to a power generation technical field especially relates to a fused salt energy storage power station system.
Background
With the increasing energy demand and the reduction of traditional petrochemical resources, new energy power generation such as wind power, photovoltaic and hydropower is rapidly developed. However, the new energy power generation system is greatly influenced by external environmental factors, and the phenomena of wind and light abandonment are serious, so that great impact is caused on the stability of power grid load and frequency response, and the large-scale internet access of new energy is influenced. And the peak regulation mechanism of the existing power station can not meet the new requirement of the power grid on the flexibility of the power side, and the existing power station can not realize the flexible operation of the unit under any load.
Accordingly, the prior art is yet to be improved and developed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a unit flexibility is higher, and frequency modulation performance is higher, and unit load control range is wide, and the generating efficiency is high, and fail safe nature and economic nature are higher fused salt energy storage power station system.
To achieve the purpose, the utility model adopts the following technical proposal:
a molten salt energy storage power station system comprises a cold molten salt tank, a cold molten salt pump, a vapor-liquid heat exchanger, a hot molten salt tank, a hot molten salt pump, a heat exchanger group, a steam turbine generator set and a boiler;
the cold molten salt tank, the cold molten salt pump, the vapor-liquid heat exchanger, the hot molten salt tank, the hot molten salt pump and the heat exchanger group are sequentially connected;
the boiler is connected with the vapor-liquid heat exchanger so that the vapor provided by the boiler heats the molten salt passing through the vapor-liquid heat exchanger;
and high-pressure feed water is converted into steam through the heat exchanger set and then supplied to the steam turbine generator set for power generation.
As an alternative of the above molten salt energy storage power station system, the heat exchanger group includes a first heat exchanger, a second heat exchanger, a third heat exchanger and a fourth heat exchanger; the second heat exchanger, the third heat exchanger and the fourth heat exchanger are connected in series, and the first heat exchanger is connected with the second heat exchanger in parallel;
the steam turbine generator set comprises a high-pressure cylinder and a medium-low pressure cylinder, high-pressure feed water sequentially passes through the second heat exchanger, the third heat exchanger and the fourth heat exchanger and then is conveyed to the high-pressure cylinder, and steam coming out of the high-pressure cylinder flows through the first heat exchanger and then is conveyed to the medium-low pressure cylinder.
As an alternative of the above molten salt energy storage power station system, the exhaust steam of the medium-low pressure cylinder enters the second heat exchanger after passing through the condenser and the heat recovery system.
As an alternative of the above molten salt energy storage power station system, a superheater is arranged in the boiler, and the superheater is connected with the vapor-liquid heat exchanger, so that superheated steam at an outlet of the superheater is delivered to the vapor-liquid heat exchanger.
As an alternative of the above molten salt energy storage power station system, an economizer is arranged in the boiler, and the vapor-liquid heat exchanger is connected to the economizer through a high-pressure pump, so that water discharged by the vapor-liquid heat exchanger flows back into the boiler through the high-pressure pump and the economizer.
As an alternative of the above molten salt energy storage power station system, an in-furnace heat exchanger is arranged in the boiler, and the in-furnace heat exchanger is connected with the vapor-liquid heat exchanger and the hot-melt salt tank, so that the molten salt in the vapor-liquid heat exchanger flows through the in-furnace heat exchanger and then flows to the hot-melt salt tank.
As an alternative of the above molten salt energy storage power station system, the in-furnace heat exchanger includes a hearth radiation section heat exchanger, a low-temperature convection section heat exchanger and a high-temperature convection section heat exchanger, and the hearth radiation section heat exchanger, the low-temperature convection section heat exchanger and the high-temperature convection section heat exchanger are connected in series and are respectively arranged at different positions of the boiler.
As an alternative to the above molten salt energy storage power station system, the steam turbine generator set further includes a generator, and the generator is connected to the high-pressure cylinder and the medium-low pressure cylinder, so that the high-pressure cylinder and the medium-low pressure cylinder drive the generator to generate electricity.
As an alternative of the molten salt energy storage power station system, the rear end of the hot molten salt tank is provided with a valve.
The utility model discloses an useful part lies in: the steam used by the steam turbine generator set is completely generated by heating molten salt, the flexibility of the turbine generator set is not influenced by the operation of a boiler, and the frequency modulation performance of the turbine generator set is improved. Because the steam used by the steam turbine generator set is generated by heating the molten salt in the hot-melt salt tank, the load of the steam turbine generator set can be adjusted from zero to one hundred percent, the heat supply can be controlled only by adjusting the valve of the hot-melt salt tank according to the load requirement, and the load of the steam turbine generator set can be adjusted from zero to one hundred percent. The utility model discloses a fused salt energy storage power station system can improve equipment utilization of unit, generating efficiency, fail safe nature and economic nature.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a molten salt energy storage power station system of the present invention.
In the figure:
100. a heat exchanger group; 200. a steam turbine generator set; 1. a cold molten salt tank; 2. a cold molten salt pump; 3. a vapor-liquid heat exchanger; 4. a heat exchanger inside the furnace; 5. a hot-melt salt tank; 6. a hot-melt salt pump; 7. a first heat exchanger; 8. a second heat exchanger; 9. a third heat exchanger; 10. a fourth heat exchanger; 11. a boiler; 12. a superheater; 13. a coal economizer; 14. a high pressure cylinder; 15. a medium-low pressure cylinder; 16. a generator; 17. a high pressure pump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
The utility model provides a fused salt energy storage power station system, figure 1 is the utility model discloses well fused salt energy storage power station system embodiment's structural schematic diagram, as shown in figure 1, fused salt energy storage power station system includes cold molten salt jar 1, cold molten salt pump 2, vapour liquid heat exchanger 3, hot molten salt jar 5, hot molten salt pump 6, heat exchanger group 100, steam turbine generating set 200 and boiler 11. The cold molten salt tank 1, the cold molten salt pump 2, the vapor-liquid heat exchanger 3, the hot molten salt tank 5, the hot molten salt pump 6 and the heat exchanger group 100 are connected in sequence to form a molten salt system circulation. As shown in fig. 1, liquid water from high pressure feed water is heated into steam by a heat exchanger group 100 and supplied to a steam turbine generator set 200 for power generation, and the liquid water can be sent from a high pressure inlet of a power station No. 1. The boiler 11 is connected to the vapor-liquid heat exchanger 3 so that the molten salt passing through the vapor-liquid heat exchanger 3 is heated by the steam supplied from the boiler 11.
During molten salt energy storage power station system work, the microthermal cold molten salt in the cold molten salt jar 1 is gone into vapour liquid heat exchanger 3 by cold molten salt pump 2 pump, steam in the boiler 11 lets in vapour liquid heat exchanger 3, heat cold molten salt, the molten salt after being heated gets into hot molten salt jar 5 in the vapour liquid heat exchanger 3, store in hot molten salt jar 5, then hot molten salt pump income heat exchanger group 100 in with hot molten salt jar 5 through hot molten salt pump 6, with the high pressure feedwater heating become steam supply and give turbine generator set 200 power generation, hot molten salt becomes cold molten salt after heat exchanger group 100, get back to in the cold molten salt jar 1.
The utility model discloses in, the used steam of steam turbine generator set 200 is whole to be produced by the fused salt heating, and does not need boiler 11 to provide, and the flexibility of unit does not receive the influence of boiler 11 operation, improves the frequency modulation performance of unit. Because the steam used by the steam turbine generator set 200 is generated by heating the molten salt in the hot-melt salt tank 5, the load of the steam turbine generator set 200 can be adjusted from zero to one hundred percent, and the heat supply can be controlled only by adjusting the valve of the hot-melt salt tank 5 according to the load requirement, so that the load of the steam turbine generator set 200 can be adjusted from zero to one hundred percent. The utility model discloses a fused salt energy storage power station system can improve equipment utilization of unit, generating efficiency, fail safe nature and economic nature.
In addition, the high-temperature molten salt has the advantages of good heat transfer performance, low working pressure, wide liquid temperature range, high use temperature, low cost, safety, reliability and the like, and is a high-temperature heat transfer and storage working medium with great prospect.
In an embodiment, a valve is arranged on a pipeline at the rear end of the hot-melt salt tank 5, or a valve is directly arranged on the hot-melt salt tank 5, the amount of hot-melt salt entering the heat exchanger group 100 is controlled by the valve, so that the amount of hot-melt salt entering the heat exchanger group 100 can be controlled according to the load of the steam turbine generator set 200, the opening degree of the valve can be adjusted from zero to one hundred percent, and the load of the steam turbine generator set 200 can be adjusted from zero to one hundred percent.
In one embodiment, as shown in fig. 1, the heat exchanger group 100 includes a first heat exchanger 7, a second heat exchanger 8, a third heat exchanger 9, and a fourth heat exchanger 10, where the second heat exchanger 8, the third heat exchanger 9, and the fourth heat exchanger 10 are connected in series, that is, the second heat exchanger 8, the third heat exchanger 9, and the fourth heat exchanger 10 are connected in series, and the first heat exchanger 7 is connected in parallel with the second heat exchanger 8. As shown in fig. 1, the molten salt inlets of the first heat exchanger 7 and the second heat exchanger 8 are both connected to the rear end of the hot-melt salt pump 6, and the molten salt outlets of the first heat exchanger 7 and the second heat exchanger 8 are connected to the molten salt inlet of the third heat exchanger 9 after being converged, that is, the molten salts of the first heat exchanger 7 and the second heat exchanger 8 are mixed and then enter the third heat exchanger 9, and the molten salt passing through the third heat exchanger 9 enters the fourth heat exchanger 10.
Referring to fig. 1, the steam turbine generator set 200 includes a high pressure cylinder 14 and a medium pressure cylinder 15, and the high pressure cylinder 14 and the medium pressure cylinder 15 are conventional components of the steam turbine generator set 200 and are not described herein again. The liquid water sequentially passes through the second heat exchanger 8, the third heat exchanger 9 and the fourth heat exchanger 10 to form steam, the steam enters the high-pressure cylinder 14 to push an impeller in the high-pressure cylinder 14 to generate power, and as shown in fig. 1, the steam coming out of the high-pressure cylinder 14 enters the first heat exchanger 7 and then is conveyed to the medium-low pressure cylinder 15 to push the impeller in the medium-low pressure cylinder 15 to generate power. In addition, the exhaust steam of the medium and low pressure cylinder 15 passes through a condenser and a regenerative system to the second heat exchanger 8.
In one embodiment, a superheater 12 is disposed in the boiler 11, and the superheater 12 is connected to the vapor-liquid heat exchanger 3, so that superheated steam at an outlet of the superheater 12 enters the vapor-liquid heat exchanger 3 to heat the cold molten salt in the vapor-liquid heat exchanger 3.
In one embodiment, as shown in fig. 1, the water discharged from the vapor-liquid heat exchanger 3 is returned to the boiler 11, so as to save resources and improve energy utilization rate.
In an embodiment, an economizer 13 is further disposed in the boiler 11, and the vapor-liquid heat exchanger 3 is connected to the economizer 13 through a high-pressure pump 17, so that water discharged from the vapor-liquid heat exchanger 3 flows back into the boiler 11 through the high-pressure pump 17 and the economizer 13 to form an in-boiler water-steam circulation system. The circulation process of the whole in-furnace water-steam circulation system is as follows: superheated steam at the outlet of the superheater 12 in the boiler 11 enters the vapor-liquid heat exchanger 3, is cooled by the vapor-liquid heat exchanger 3 and then enters the economizer 13 in the boiler 11, and the circulation process is completed.
In an embodiment, an in-furnace heat exchanger 4 is further disposed in the boiler 11, and the in-furnace heat exchanger 4 is connected to the vapor-liquid heat exchanger 3 and the hot-melt salt tank 5, so that the molten salt in the vapor-liquid heat exchanger 3 flows through the in-furnace heat exchanger 4 and then flows to the hot-melt salt tank 5. Of course, the molten salt in the vapor-liquid heat exchanger 3 may be directly flowed into the hot-molten salt tank 5 without providing the in-furnace heat exchanger 4. The arrangement of the heat exchanger 4 in the boiler can improve the utilization rate of energy and fully utilize the heat in the boiler 11 to further heat the molten salt. That is, the molten salt is heated by the vapor-liquid heat exchanger 3 and then flows to the in-furnace heat exchanger 4 in the boiler 11 to be further heated.
In an embodiment, the heat exchanger 4 in the furnace comprises a hearth radiation section heat exchanger, a low-temperature convection section heat exchanger and a high-temperature convection section heat exchanger, the hearth radiation section heat exchanger, the low-temperature convection section heat exchanger and the high-temperature convection section heat exchanger are connected in series and are respectively arranged at different positions of the boiler 11, different heat exchangers are arranged according to different positions of the boiler 11, the heat exchangers are adapted to different positions in the boiler 11, and the heat exchange efficiency is improved.
Referring to fig. 1, the steam turbine generator set 200 further includes an electric generator 16, and the electric generator 16 is connected to the high pressure cylinder 14 and the medium pressure and low pressure cylinder 15, so that the high pressure cylinder 14 and the medium pressure and low pressure cylinder 15 drive the electric generator 16 to generate electricity, and when the impeller of the high pressure cylinder 14 and the medium pressure and low pressure cylinder 15 is driven by steam to rotate, the impeller can drive the electric generator 16 to generate electricity.
The utility model discloses a fused salt energy storage power station system has improved the absorption capacity that absorbs of the new forms of energy, can effectively reduce and abandon wind, abandon the light phenomenon, has avoided the waste of resource, alleviates peak regulation pressure, supports the extensive power generation and the grid-connected of the new forms of energy. The utility model discloses a fused salt energy storage power station system is favorable to the configuration of the structure of power system power supply side and power system's planning, operation and control, provides the guarantee for power system's nimble safety and stability operation.
The utility model discloses a fused salt energy storage power station system's working process does:
cold molten salt with the temperature of 290 ℃ is pumped into a vapor-liquid heat exchanger 3 from a cold molten salt tank 1 through a cold molten salt pump 2 to absorb the heat of the superheated steam, then enters a furnace heat exchanger 4 to be further heated to 550 ℃ by flue gas, enters a hot molten salt tank 5, and the molten salt absorbs the redundant heat of a boiler 11 to finish the energy storage process;
when the steam turbine generator set 200 is under a low load, only a small part of hot molten salt in the hot molten salt tank 5 enters the heat exchanger group 100 to heat steam required by the steam turbine generator set 200, the hot molten salt is respectively pumped into the first heat exchanger 7 and the second heat exchanger 8 through the hot molten salt pump 6 from the hot molten salt tank 5 to exchange heat, the molten salt after passing through the first heat exchanger 7 and the molten salt after passing through the second heat exchanger 8 are mixed and then enter the third heat exchanger 9 and the fourth heat exchanger 10 to exchange heat, and the molten salt enters the cold molten salt tank 1 after the temperature is reduced to 290 ℃ to complete the heating steam energy release process; the feed water at the No. 1 high pressure inlet is preheated in the second heat exchanger 8, enters the third heat exchanger 9 to complete the evaporation process, finally enters the high pressure cylinder 14 to apply work after the fourth heat exchanger 10 completes the overheating process, and the cold steam enters the medium and low pressure cylinder 15 to apply work after being heated by the first heat exchanger 7 and then enters the heat recovery system through the condenser to complete the circulation process.
When the steam turbine generator set 200 is under high load, more hot molten salt in the hot molten salt tank 5 enters the heat exchanger set 100, the feed water of the 1 st high pressure outlet is heated through the first heat exchanger 7, the second heat exchanger 8, the third heat exchanger 9 and the fourth heat exchanger 10, so that the steam turbine generator set 200 generates power, the specific heat exchange and molten salt circulation processes are the same as those of the steam turbine generator set 200 in the previous section under low load, and no further description is given here, only the valve opening degrees of the hot molten salt tank 5 are different between under low load and under high load, so that the hot molten salt amount entering the heat exchanger set 100 is different, and the power grid peak regulation task is completed.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (9)

1. A molten salt energy storage power station system is characterized by comprising a cold molten salt tank (1), a cold molten salt pump (2), a vapor-liquid heat exchanger (3), a hot molten salt tank (5), a hot molten salt pump (6), a heat exchanger group (100), a steam turbine generator set (200) and a boiler (11);
the cold molten salt tank (1), the cold molten salt pump (2), the vapor-liquid heat exchanger (3), the hot molten salt tank (5), the hot molten salt pump (6) and the heat exchanger group (100) are connected in sequence;
the boiler (11) is connected with the vapor-liquid heat exchanger (3) so that the molten salt passing through the vapor-liquid heat exchanger (3) is heated by the steam provided by the boiler (11);
and high-pressure feed water is changed into steam through the heat exchanger group (100) and then supplied to the steam turbine generator set (200) for power generation.
2. The molten salt energy storage power station system of claim 1 characterized in that the heat exchanger group (100) comprises a first heat exchanger (7), a second heat exchanger (8), a third heat exchanger (9) and a fourth heat exchanger (10); the second heat exchanger (8), the third heat exchanger (9) and the fourth heat exchanger (10) are connected in series, and the first heat exchanger (7) and the second heat exchanger (8) are connected in parallel;
the steam turbine generator set (200) comprises a high-pressure cylinder (14) and a medium-low pressure cylinder (15), high-pressure feed water sequentially passes through the second heat exchanger (8), the third heat exchanger (9) and the fourth heat exchanger (10) and then is conveyed to the high-pressure cylinder (14), and steam coming out of the high-pressure cylinder (14) flows through the first heat exchanger (7) and then is conveyed to the medium-low pressure cylinder (15).
3. The molten salt energy storage power station system of claim 2, characterized in that the exhaust steam of the medium and low pressure cylinder (15) enters the second heat exchanger (8) after passing through a condenser and a regenerative system.
4. The molten salt energy storage power station system as claimed in claim 1, characterized in that a superheater (12) is arranged in the boiler (11), the superheater (12) being connected with the vapor-liquid heat exchanger (3) so that superheated steam at the outlet of the superheater (12) is delivered to the vapor-liquid heat exchanger (3).
5. The molten salt energy storage power station system of claim 4, characterized in that an economizer (13) is provided in the boiler (11), and the vapour-liquid heat exchanger (3) is connected to the economizer (13) by a high-pressure pump (17) so that water discharged from the vapour-liquid heat exchanger (3) flows back into the boiler (11) through the high-pressure pump and the economizer (13).
6. The molten salt energy storage power station system as claimed in claim 1, characterized in that an in-furnace heat exchanger (4) is arranged in the boiler (11), and the in-furnace heat exchanger (4) is connected with the vapor-liquid heat exchanger (3) and the hot-melt salt tank (5) so that the molten salt in the vapor-liquid heat exchanger (3) flows to the hot-melt salt tank (5) after flowing through the in-furnace heat exchanger (4).
7. The molten salt energy storage power station system of claim 6, characterized in that the in-furnace heat exchangers (4) comprise furnace radiant section heat exchangers, low temperature convection section heat exchangers and high temperature convection section heat exchangers, which are connected in series and are respectively located at different positions of the boiler (11).
8. The molten salt energy storage power station system of claim 2 characterized in that the steam turbine generator set (200) further comprises a generator (16), the generator (16) being connected with the high pressure cylinder (14) and the medium pressure and low pressure cylinder (15) so that the high pressure cylinder (14) and the medium pressure and low pressure cylinder (15) drive the generator (16) to generate electricity.
9. The molten salt energy storage power station system as claimed in claim 1, characterized in that the rear end of the hot molten salt tank (5) is provided with a valve.
CN202120840176.3U 2021-04-22 2021-04-22 Fused salt energy storage power station system Active CN214664318U (en)

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CN202120840176.3U CN214664318U (en) 2021-04-22 2021-04-22 Fused salt energy storage power station system

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Application Number Priority Date Filing Date Title
CN202120840176.3U CN214664318U (en) 2021-04-22 2021-04-22 Fused salt energy storage power station system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114810230A (en) * 2022-05-31 2022-07-29 西安热工研究院有限公司 Wind and light combined energy storage power generation and heat supply system and method for steam turbine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114810230A (en) * 2022-05-31 2022-07-29 西安热工研究院有限公司 Wind and light combined energy storage power generation and heat supply system and method for steam turbine
CN114810230B (en) * 2022-05-31 2023-11-03 西安热工研究院有限公司 Energy storage, power generation and heat supply system and method of turbine combined with wind and light

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