CN112228852A

CN112228852A - Heat transfer and storage device, heat transfer and storage power generation system and energy storage power station

Info

Publication number: CN112228852A
Application number: CN202011098835.7A
Authority: CN
Inventors: 袁晓凤; 曹云; 姜凯华; 贾国斌
Original assignee: Shanghai Institute of Applied Physics of CAS
Current assignee: Shanghai Institute of Applied Physics of CAS
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2021-01-15

Abstract

The invention discloses a heat transfer and storage device, a heat transfer and storage power generation system and an energy storage power station, wherein the heat transfer and storage device comprises a heat accumulator and a heating unit, the heat accumulator is of a tubular structure, and two ends of the heat accumulator are respectively provided with a low-temperature port and a high-temperature port; the heating unit is connected to the heat accumulator and used for heating the working medium in the heat accumulator. The heat transfer and storage power generation system comprises a heat transfer and storage device, a heat exchanger and a power generation unit. The energy storage power station comprises the heat transfer and storage power generation system. Compared with a heat storage tank, the heat accumulator of the invention adopts a pipeline type structure, and the height of the pipeline type structure is obviously reduced, so that the pressure of a working medium at the bottom of the heat accumulator is reduced, the plate thickness of the heat accumulator is greatly reduced, and the manufacturing cost is obviously reduced. In addition, compare in current heat storage tank, greatly reduced major diameter high temperature flat bottom container because the fused salt that factors such as ground subside arouse reveals the risk, improved engineering reliability.

Description

Heat transfer and storage device, heat transfer and storage power generation system and energy storage power station

Technical Field

The invention relates to the technical field of energy storage, in particular to a heat transfer and storage device, a heat transfer and storage power generation system and an energy storage power station.

Background

Renewable energy sources in China are in a new period of rapid large-scale development. By the end of 2019, the renewable energy power generation and installation reaches 7.94 hundred million kilowatts in China, and the renewable energy power generation and installation is increased by 9 percent on the same scale and accounts for 39.5 percent of the whole power installation; wherein, wind power and photovoltaic power generation firstly 'double' break through 2 hundred million kilowatts. Wind power is different from a conventional power supply, and the generated output of the wind power is determined by the condition of wind, namely the wind power has the characteristics of intermittence, volatility, randomness and the like. In addition, the characteristics of wind power and electric load are often opposite, and the characteristic of reverse peak regulation is achieved. The illumination is uncontrollable and unpredictable, sometimes changes rapidly, and particularly when affected by cloud cover, the illumination intensity can change dramatically, and further the output power of the photovoltaic array fluctuates strongly. Wind power and photovoltaic have the problems of intermittence and instability, so that grid connection and consumption of the wind power and the photovoltaic are difficult, and wind and light abandon is serious. 169 hundred million kilowatts of national abandoned wind electricity in 2019, and the national average abandoned wind rate is 4%; the light abandonment is 46 hundred million kilowatt hours, and the national average light abandonment rate is 2 percent. On the other hand, with the continuous development and construction of electric power facilities in China, the problem that the 'valley electricity' cannot be consumed is serious, and the idle units at night can reach 4 hundred million kilowatts and account for nearly 38 percent of the total installed capacity. Therefore, an effective way to technically solve the problems of renewable energy grid connection and grid peak-valley difference represented by wind power and photovoltaic is to adopt an energy storage technology.

At present, the energy storage technologies which are applied in large-scale commercialization and have lower cost include water pumping energy storage and compressed air energy storage, but the two technologies have high requirements on site selection, so that the two technologies have no universality. In recent years, a heat storage power station adopting a double-tank molten salt heat storage technology is started, the heat storage power station is not limited by the utilization conditions, the loss of ' wind abandoning ' and ' light abandoning ' of wind power and photovoltaic power stations can be effectively reduced, and the functions of ' peak clipping and valley filling ', emergency power support ' and the like can be provided for a power grid.

However, for the existing double-tank molten salt heat storage power station, the bottom pressure of the molten salt storage tank is higher due to the higher height of the molten salt storage tank, so that the wall thickness of the molten salt storage tank is thicker and the manufacturing cost is higher; and because the height of the molten salt storage tank is higher, a long-shaft molten salt pump with higher cost is required to be used; in addition, the large-diameter high-temperature flat-bottom container easily causes the risk of molten salt leakage due to factors such as foundation settlement and the like, so that the large-scale application of the double-tank molten salt heat storage power station is influenced.

Disclosure of Invention

The invention aims to overcome the defects that the existing double-fused-salt storage tank is thick in wall thickness, high in manufacturing cost, easy to cause fused salt leakage and the like, and provides a heat transfer and storage device, a heat transfer and storage power generation system and an energy storage power station.

A heat transfer and storage apparatus comprising:

the heat accumulator is of a tubular structure, and two ends of the heat accumulator are respectively provided with a low-temperature port and a high-temperature port;

and the heating unit is connected to the heat accumulator and is used for heating the working medium in the heat accumulator.

Preferably, the heat accumulator further comprises blocking portions, the blocking portions are arranged inside the heat accumulator at intervals, and the blocking portions are used for limiting the flow of the working medium at the bottom of the heat accumulator.

Preferably, the blocking portion includes a first baffle and a second baffle, the first baffle and the second baffle are connected to a side wall surface of the heat accumulator, a first gap is formed between the top of the first baffle and the heat accumulator, a second gap is formed between the bottom of the second baffle and the heat accumulator, and the working medium flows through the first gap and the second gap in sequence.

Preferably, the blocking part comprises a baffle and a conduit, the baffle is connected to the side wall surface of the heat accumulator, the conduit is located on one side of the baffle, the conduit extends up and down, the two ends of the conduit are provided with an upper opening and a lower opening, the upper opening penetrates through the baffle, and the working medium flows through the upper opening and the lower opening in sequence.

Preferably, the regenerator is in the shape of a non-closed circular ring or U.

Preferably, the heat accumulator includes a plurality of the tubular structures connected in sequence, and the diameters of the plurality of tubular structures are different.

Preferably, the working substance is a molten salt.

Preferably, the heating unit comprises an electric heater which is arranged inside the heat accumulator at intervals, the electric heater is internally provided with a heating element, and the heating element is electrically connected to an external power supply.

Preferably, the heating unit includes an electric heater, the electric heater is disposed outside the heat accumulator, an outer wall surface of the electric heater is provided with a medium inlet and a medium outlet, the medium inlet is connected to the low temperature port, the medium outlet is connected to the high temperature port, a heating member is disposed inside the electric heater, and the heating member is electrically connected to an external power supply.

Preferably, the heating unit comprises a heat storage heat exchanger and a heat source, a low-temperature inlet, a high-temperature outlet, a high-temperature inlet and a low-temperature outlet are arranged on the outer wall surface of the heat storage heat exchanger, the low-temperature inlet is connected to the low-temperature port of the heat storage and communicated with the heat storage, the high-temperature outlet is connected to the high-temperature port of the heat storage and communicated with the heat storage, and the low-temperature outlet is connected to the heat source.

The utility model provides a heat transfer and storage power generation system, includes as above heat transfer and storage device, heat exchanger and power generation unit, the outer wall of heat exchanger is equipped with hot side import, hot side export, cold side import, cold side export, hot side import connect in the high temperature mouth of heat accumulator and with the heat accumulator is linked together, hot side export connect in the low temperature mouth of heat accumulator and with the heat accumulator is linked together, the cold side export connect in power generation unit and with power generation unit is linked together.

Preferably, the heat transfer and storage device comprises a molten salt pump, and two ends of the molten salt pump are respectively connected to the high-temperature port and the hot-side inlet and are communicated with the heat accumulator and the heat exchanger.

Preferably, the power generation unit comprises a generator, a steam turbine, a condenser and a water pump, the generator is connected to the steam turbine, an inlet and an outlet of the steam turbine are respectively connected to the cold side outlet and an inlet of the condenser, two ends of the water pump are respectively connected to the outlet of the condenser and the cold side inlet, and the steam turbine, the generator, the condenser and the water pump are communicated with each other and form a power generation loop.

Preferably, the power generation unit comprises a turbine, a generator, a compressor and a precooler, the generator is connected to the turbine, the turbine and the compressor share a transmission shaft, an inlet and an outlet of the turbine are respectively connected to the cold side outlet and the precooler, an inlet and an outlet of the compressor are respectively connected to the precooler and the cold side inlet, and the turbine, the precooler, the compressor and the heat exchanger are communicated with each other to form a power generation loop.

Preferably, the power generation unit further comprises a heat regenerator, an outer wall surface of the heat regenerator is provided with a high-temperature side inlet, a high-temperature side outlet, a low-temperature side inlet and a low-temperature side outlet, the high-temperature side inlet is connected to the turbine and communicated with the turbine, the high-temperature side outlet is connected to the precooler and communicated with the precooler, the low-temperature side inlet is connected to the compressor and communicated with the compressor, and the low-temperature side outlet is connected to the cold-side inlet and communicated with the heat exchanger.

An energy storage power plant comprising a regenerative power generation system as described above.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The positive progress effects of the invention are as follows:

compared with a heat storage tank, the heat accumulator of the invention adopts a pipeline type structure, and the height of the pipeline type structure is obviously reduced, so that the pressure of a working medium at the bottom of the heat accumulator is reduced, the plate thickness of the heat accumulator is greatly reduced, and the manufacturing cost is obviously reduced; the heat accumulator can be prefabricated in sections in a factory workshop, butt welding is carried out on site, the site installation time is saved, the working efficiency is improved, and the cost of the heat accumulator is reduced. In addition, compare in current heat storage tank, greatly reduced major diameter high temperature flat bottom container because the fused salt that factors such as ground subside arouse reveals the risk, improved engineering reliability. Meanwhile, due to the fact that the height is low, a mature molten salt pump in the current market can be adopted, and compared with a long-shaft molten salt pump adopted by a heat storage tank, the cost of the molten salt pump is reduced. Compared with a double-tank heat transfer and storage power generation system, the heat transfer and storage power generation system saves a heat storage pipeline and reduces the total cost because the heat accumulator can simultaneously store high-temperature working media and low-temperature working media.

Drawings

Fig. 1 is a schematic structural diagram of an energy storage power plant according to a preferred embodiment of the present invention.

Fig. 2 is a schematic view of the construction of a regenerator in accordance with a preferred embodiment of the present invention.

Fig. 3 is a schematic view of the structure of the inside of the regenerator in accordance with a preferred embodiment of the present invention.

Fig. 4 is a schematic structural diagram of another energy storage power station according to a preferred embodiment of the present invention.

Fig. 5 is a schematic structural view of yet another energy storage power station according to a preferred embodiment of the present invention.

Fig. 6 is a schematic structural view of yet another energy storage power station in accordance with a preferred embodiment of the present invention.

Description of reference numerals:

power supply 1

Electric heater 2

Heat accumulator 3

Cryogenic port 32

High temperature port 33

Barrier section 31

First baffle 311

Second baffle 312

Molten salt pump 4

Heat exchanger 5

Steam turbine 6

Generator 7

Condenser 8

Water pump 9

Turbine 10

Regenerator 11

Precooler 12

Compressor 13

Shut-off

valves

141, 142, 143, 144, 145, 146

Other heat sources 15

Heat storage heat exchanger 16

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.

As shown in fig. 1, the present invention discloses a heat transfer and storage apparatus, which includes a heat accumulator 3 and a heating unit, wherein the heat accumulator 3 is of a tubular structure, and both ends of the heat accumulator 3 are respectively provided with a low temperature port 32 and a high temperature port 33; the heating unit is connected to the heat accumulator 3 and is used for heating the working medium in the heat accumulator 3.

In the embodiment, a high-temperature working medium and a low-temperature working medium can be stored in the heat accumulator 3 together, the low-temperature working medium enters the heat accumulator 3 from the low-temperature port 32, the high-temperature working medium flows out of the heat accumulator 3 from the high-temperature port 33, and an inclined temperature layer is formed at the boundary of the low-temperature working medium and the high-temperature working medium. The heat accumulator in the embodiment adopts a pipeline type structure, so that the plate thickness of the heat accumulator is greatly reduced, and the manufacturing cost is obviously reduced; the heat accumulator can be prefabricated in sections in a factory workshop, and butt welding is carried out on site, so that the site installation time is saved, and the working efficiency is improved; in addition, compare in current heat storage tank, greatly reduced major diameter high temperature flat bottom container because the fused salt that factors such as ground subside arouse reveals the risk, improved engineering reliability. Meanwhile, due to the fact that the height is low, a mature molten salt pump in the current market can be adopted, and compared with a long-shaft molten salt pump adopted by a heat storage tank, the cost of the molten salt pump is reduced.

As shown in fig. 3, the regenerator 3 further includes a blocking portion 31, a plurality of blocking portions 31 are provided at intervals inside the regenerator 3, and the blocking portions 31 are used for limiting the flow of the working medium at the bottom of the regenerator 3.

In the embodiment, since the density of the low-temperature working medium is greater than that of the high-temperature working medium, the low-temperature working medium entering from the low-temperature port 32 easily sinks into the bottom of the heat accumulator 3 and quickly flows out of the high-temperature port 33, so that the thickness of the thermocline is reduced, and the thermocline is damaged. Through setting up separation portion 31, slowed down the flow velocity of low temperature working medium at heat accumulator 3 bottom, reduced the influence of buoyancy to thermocline thickness in heat accumulator 3 to reduce heat accumulator 3's size, reduce heat accumulator 3 cost.

Specifically, the blocking portion 31 includes a first baffle 311 and a second baffle 312, the first baffle 311 and the second baffle 312 are connected to the side wall surface of the regenerator 3, a first gap is formed between the top of the first baffle 311 and the regenerator 3, a second gap is formed between the bottom of the second baffle 312 and the regenerator 3, and the working medium flows through the first gap and the second gap in this order. For a regenerator with a diameter of 3m, one baffle 31 is arranged at an interval of about 2m, the first baffle 311 and the second baffle 312 are spaced at an interval of 0.2m, and the first baffle 311 and the second baffle 312 are spaced at a distance of 0.2m from the top and bottom of the regenerator. When passing through the blocking portion 31, the low-temperature molten salt at the bottom is blocked by the first baffle 311, and the low-temperature molten salt needs to firstly pass through the top of the first baffle 311, then reach the middle area between the first baffle 311 and the second baffle 312, then flow to the bottom of the second baffle 312, and then flow to the next blocking portion 31, so that the low-temperature molten salt is prevented from rapidly flowing to a high-temperature port along the bottom of the heat accumulator 3.

In other alternative embodiments, the blocking portion 31 may also include a baffle connected to a side wall surface of the heat accumulator, and a pipe located at one side of the baffle, the pipe extending up and down and having an upper opening and a lower opening at both ends, the upper opening passing through the baffle, and the working medium sequentially flowing through the upper opening and the lower opening.

As shown in fig. 1, the regenerator is in the form of a non-closed circular ring. The regenerator 3 is arranged in a ring structure, so that the high-temperature port 33 is close to the low-temperature port 32, the length of a pipeline between the high-temperature port 33 and the low-temperature port 32 is obviously reduced, and the cost is further saved. In other alternative embodiments, the illustrated regenerator 3 may also be U-shaped, as shown in fig. 2.

As shown in fig. 2, the regenerator 3 may comprise a plurality of tubular structures connected in series, the plurality of tubular structures having different diameters. The large-diameter pipelines are connected through the small-diameter pipeline, so that the heat accumulator 3 can be maintained in a segmented mode. In particular, the regenerator 3 comprises two straight cylindrical pipes and one elbow of smaller diameter.

In the present embodiment, the working medium in the regenerator 3 is molten salt. The molten salt may be a multi-component mixed molten salt. The fused salt has low price and good heat transfer and storage capacity, and can adopt multi-component mixed fused salt with the boiling point of over 600 ℃, including nitrate, chloride, villaumite or carbonate, and the like. And matching proper molten salt according to the temperature of the working medium of the power generation device adopted by the power generation system. The regenerator 3 may be made of GH3535, C276 or 625 alloy or stainless steel with good corrosion resistance and high temperature strength.

As shown in fig. 1 and 4-6, this embodiment further discloses a heat transfer and storage power generation system, which includes a heat transfer and storage device, a heat exchanger, and a power generation unit, where an outer wall surface of the heat exchanger is provided with a hot side inlet, a hot side outlet, a cold side inlet, and a cold side outlet, the hot side inlet is connected to a high temperature port 33 of the heat accumulator and communicated with the heat accumulator, the hot side outlet is connected to a low temperature port 32 of the heat accumulator and communicated with the heat accumulator, and the cold side outlet is connected to the power generation unit and communicated with the power generation unit.

When the energy storage is needed, the external power supply 1 heats the molten salt in the heat accumulator 3 through the heating unit, and the low-temperature molten salt is heated to the high-temperature molten salt, so that the electric energy is converted into heat energy, and the heat energy can be stored firstly after being electrically heated. When electricity is needed, high-temperature molten salt enters the heat exchanger 5 through the hot-side inlet. The heat energy of the high-temperature molten salt is transmitted to the power generation working medium in the heat exchanger 5 through the heat exchanger 5, the power generation working medium is output through the cold side outlet of the heat exchanger 5 and enters the power generation unit, the heat energy is output to the power generation unit, the heat energy of the power generation working medium is converted into electric energy through the power generation unit, and therefore power supply is achieved.

The external power source 1 may be a wind power plant, a photovoltaic power plant or other power generating plants with unstable power, as well as a thermal power plant with surplus electric power.

As shown in fig. 1 and 4-6, the heat transfer and storage device further comprises a molten salt pump 4, and two ends of the molten salt pump 4 are respectively connected to the high-temperature port 33 and the hot-side inlet and are communicated with the heat accumulator 3 and the heat exchanger 5. The molten salt pump 4 provides power for molten salt flowing in the molten salt loop, so that high-temperature molten salt enters the heat exchanger 5, and normal operation of the molten salt loop is guaranteed.

As shown in fig. 1 and 2, the heating unit includes an electric heater 2, the electric heater 2 is disposed at intervals inside a heat accumulator 3, and a heating member is provided inside the electric heater 2 and electrically connected to an external power source 1. In the present embodiment, the electric heater 2 is disposed inside the heat accumulator 3, a heat accumulation pipeline is omitted, the total cost is reduced, and at the same time, the electric heater 2 can also be used as a heat compensation heater for the heat accumulator 3.

As shown in fig. 1, the power generation unit includes a generator 7, a steam turbine 6, a condenser 8 and a water pump 9, the generator 7 is connected to the steam turbine 6, an inlet and an outlet of the steam turbine 6 are respectively connected to a cold side outlet and an inlet of the condenser 8, two ends of the water pump 9 are respectively connected to an outlet and a cold side inlet of the condenser 8, and the steam turbine 6, the generator 7, the condenser 8 and the water pump 9 are communicated with each other to form a power generation loop.

In the present embodiment, during heat storage, the external power supply 1 heats the molten salt in the heat accumulator 3 by the heating unit, and the molten salt at a low temperature is heated to the molten salt at a high temperature, so that electric energy is converted into heat energy. When electricity is needed, high-temperature molten salt with high temperature is pumped out through the molten salt pump 4 and is sent to the heat exchanger 5 to release heat energy, and the low-temperature molten salt which releases heat and becomes cold returns to the low-temperature side in the heat accumulator 3 to form an inclined temperature layer. As the heat release time increases, the thermocline moves from the low-temperature side (near the low-temperature port) to the high-temperature side (near the high-temperature port) of the regenerator 3. The high-temperature steam generated after the heat absorption of the power generation working medium in the heat exchanger 5 drives the steam turbine 6, so that the generator 7 is driven to generate power, and the heat energy is converted into electric energy. The power generation working medium cooled from the steam turbine 6 returns to the heat exchanger 5 through the condenser 8 and the water pump 9, thereby forming circulation.

In other alternative embodiments, as shown in fig. 5, the electric heater 2 may also be disposed outside the heat accumulator 3, the outer wall surface of the electric heater 2 is provided with a medium inlet and a medium outlet, the medium inlet is connected to the low temperature port, the medium outlet is connected to the high temperature port, the electric heater 2 has a heating member inside, and the heating member is electrically connected to the external power supply 1. Specifically, the heating unit further comprises a stop valve, and the conversion from heat storage to power generation is realized through the opening and closing of the stop valve. During heat storage, the stop valve 141, the stop valve 143, and the stop valve 144 are opened, the stop valve 142, the stop valve 145, and the stop valve 146 are closed, the molten salt at the low temperature side of the heat accumulator 3 is pumped out by the molten salt pump 4, and passes through the stop valve 144, the molten salt pump 4, and the stop valve 143 in order to reach the electric heater 2, and the molten salt heated by the electric heater 2 passes through the stop valve 141 and returns to the high temperature side of the heat accumulator 3. As the heat accumulation time increases, the thermocline moves from the high-temperature side to the low-temperature side of the heat accumulator 3. When heat is released, the stop valve 142, the stop valve 145 and the stop valve 146 are opened, the stop valve 141, the stop valve 143 and the stop valve 144 are closed, the molten salt at the high temperature side of the heat accumulator 3 is pumped out by the molten salt pump 4, and passes through the stop valve 142, the molten salt pump 44 and the stop valve 145 in order to the heat exchanger 5, and the molten salt which has been released heat and cooled by the heat exchanger 5 passes through the stop valve 146 and returns to the low temperature side of the heat accumulator 3. As the heat release time increases, the thermocline moves from the low-temperature side to the high-temperature side of the regenerator 3.

In other alternative embodiments, as shown in fig. 6, the heating unit may include a heat storage heat exchanger 16 and a heat source, an outer wall surface of the heat storage heat exchanger 16 is provided with a low temperature inlet, a high temperature outlet, a high temperature inlet, and a low temperature outlet, the low temperature inlet is connected to the low temperature port of the heat accumulator 3 and communicated with the heat accumulator 3, the high temperature outlet is connected to the high temperature port of the heat accumulator 3 and communicated with the heat accumulator 3, and the low temperature outlet is connected to the heat source. Wherein, the heat source adopts other heat sources 15, such as solar heat and high-temperature waste heat. Specifically, as shown in fig. 6, the heating unit includes a shut valve, and switching from heat storage to power generation is performed by opening and closing the shut valve. During heat storage, the stop valve 141, the stop valve 143, and the stop valve 144 are opened, the stop valve 142, the stop valve 145, and the stop valve 146 are closed, the molten salt at the low temperature side of the heat accumulator 3 is pumped out by the molten salt pump 4, and sequentially passes through the stop valve 144, the molten salt pump 4, and the stop valve 143 to the heat storage heat exchanger 16, and the molten salt heated by the heat storage molten salt heat exchanger 5 passes through the stop valve 141 and returns to the high temperature side of the heat accumulator 3. The heat storage heat exchanger 16 is connected to the other heat source 15 through piping. As the heat accumulation time increases, the thermocline moves from the high-temperature side to the low-temperature side of the heat accumulator 3.

In other alternative embodiments, as shown in fig. 4, the power generation unit may include a turbine 10, a generator 7, a compressor 13 and a precooler 12, the generator 7 is connected to the turbine 10, the turbine 10 and the compressor 13 are co-driven, an inlet and an outlet of the turbine 10 are respectively connected to the cold-side outlet and the precooler 12, an inlet and an outlet of the compressor 13 are respectively connected to the precooler 12 and the cold-side inlet, and the turbine 10, the precooler 12, the compressor 13 and the heat exchanger 5 are communicated with each other and form a power generation loop. The power generation unit further comprises a heat regenerator 11, wherein the outer wall surface of the heat regenerator 11 is provided with a high-temperature side inlet, a high-temperature side outlet, a low-temperature side inlet and a low-temperature side outlet, the high-temperature side inlet is connected to the turbine 10 and communicated with the turbine 10, the high-temperature side outlet is connected to the precooler 12 and communicated with the precooler 12, the low-temperature side inlet is connected to the compressor 13 and communicated with the compressor 13, and the low-temperature side outlet is connected to the cold-side inlet and communicated with the heat exchanger 5.

In the embodiment, the temperature of the power generation working medium is raised through the heat exchanger 5, the power generation working medium after being heated enters the turbine 10 to convert heat energy into mechanical energy, then the power generation is realized through the generator 7, the power generation working medium passes through the turbine 10, then passes through the heat regenerator 11 and then enters the precooler 12, and the waste heat of the power generation working medium can be further utilized through the precooler 12 to heat the outside and the like, so that the effect of energy gradient utilization is further achieved. Meanwhile, the temperature of the power generation working medium is further reduced after the power generation working medium transfers heat energy, and the power generation working medium is output through an outlet of the precooler 12 and enters the compressor 13; the power generation working medium is preheated by the heat regenerator 11 through the compressor 13 and then enters the heat exchanger 5 for cyclic utilization, and the heat energy of the power generation working medium can be further recycled through the heat regenerator 11, so that the energy-saving effect is achieved. Through the combined cycle of the power generation loop or the combined heat and power supply, the energy-saving effect is achieved, and the power generation efficiency is improved. Meanwhile, the power generation unit has the advantages of high heat-power conversion efficiency, low initial investment of equipment, low operating cost and maintenance cost, high safety, flexible site selection, modular development and the like. The power generation working medium in the power generation loop can be supercritical carbon dioxide, or can be helium, or can also be a mixed gas of helium and nitrogen.

The embodiment also discloses an energy storage power station which comprises the heat transfer and storage power generation system.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims

1. A heat transfer and storage apparatus, comprising:

2. A heat transfer and storage device as claimed in claim 1, wherein the heat accumulator further comprises a blocking portion, a plurality of blocking portions being provided at intervals inside the heat accumulator, the blocking portion being configured to restrict the flow of the working medium at the bottom of the heat accumulator.

3. A heat transfer and storage device as claimed in claim 2, wherein the blocking portion includes a first baffle and a second baffle, the first baffle and the second baffle being connected to a side wall surface of the heat accumulator, a first space being formed between a top portion of the first baffle and the heat accumulator, a second space being formed between a bottom portion of the second baffle and the heat accumulator, the working medium flowing through the first space and the second space in this order.

4. The heat accumulator according to claim 2, characterized in that the blocking portion includes a baffle plate connected to a side wall surface of the heat accumulator and a pipe located at one side of the baffle plate, the pipe extending up and down and having an upper opening and a lower opening at both ends, the upper opening passing through the baffle plate, and the working medium flowing through the upper opening and the lower opening in this order.

5. A heat transfer and storage device as claimed in claim 1, wherein the heat accumulator is in the shape of a non-closed circular ring or U.

6. A heat transfer and storage device as claimed in claim 1, wherein the heat accumulator comprises a plurality of said tubular structures connected in series, the plurality of tubular structures being of different diameters.

7. A heat transfer and storage device as claimed in claim 1 wherein the working fluid is a molten salt.

8. A heat transfer and storage device as claimed in claim 1, wherein the heating unit comprises an electric heater which is arranged at intervals inside the heat accumulator, and the electric heater has a heating member inside thereof which is electrically connected to an external power supply.

9. A heat transfer and storage device as claimed in claim 1, wherein the heating unit comprises an electric heater disposed outside the heat accumulator, an outer wall surface of the electric heater is provided with a medium inlet and a medium outlet, the medium inlet is connected to the low temperature port, the medium outlet is connected to the high temperature port, and the electric heater has a heating member therein, the heating member being electrically connected to an external power supply.

10. A heat transfer and storage apparatus according to claim 1, wherein the heating unit includes a heat storage heat exchanger and a heat source, and an outer wall surface of the heat storage heat exchanger is provided with a low temperature inlet, a high temperature outlet, a high temperature inlet, and a low temperature outlet, the low temperature inlet is connected to the low temperature port of the heat storage and communicated with the heat storage, the high temperature outlet is connected to the high temperature port of the heat storage and communicated with the heat storage, and the low temperature outlet is connected to the heat source.

11. A heat transfer and storage power generation system, characterized in that the heat transfer and storage power generation system comprises the heat transfer and storage device, a heat exchanger and a power generation unit according to any one of claims 1 to 10, the outer wall surface of the heat exchanger is provided with a hot side inlet, a hot side outlet, a cold side inlet and a cold side outlet, the hot side inlet is connected to the high temperature port of the heat accumulator and communicated with the heat accumulator, the hot side outlet is connected to the low temperature port of the heat accumulator and communicated with the heat accumulator, and the cold side outlet is connected to the power generation unit and communicated with the power generation unit.

12. A heat transfer and storage power generation system according to claim 11, wherein the heat transfer and storage device comprises a molten salt pump, both ends of which are connected to the high temperature port and the hot side inlet, respectively, and communicate with the heat accumulator and the heat exchanger.

13. The heat transfer and storage power generation system according to claim 11, wherein the power generation unit comprises a power generator, a steam turbine, a condenser and a water pump, the power generator is connected to the steam turbine, an inlet and an outlet of the steam turbine are respectively connected to the cold-side outlet and an inlet of the condenser, two ends of the water pump are respectively connected to the outlet of the condenser and the cold-side inlet, and the steam turbine, the power generator, the condenser and the water pump are communicated with each other and form a power generation loop.

14. The regenerative thermal power generation system according to claim 11, wherein the power generation unit comprises a turbine, a generator, a compressor and a precooler, the generator is connected to the turbine, the turbine and the compressor are in a transmission shaft, an inlet and an outlet of the turbine are respectively connected to the cold side outlet and the precooler, an inlet and an outlet of the compressor are respectively connected to the precooler and the cold side inlet, and the turbine, the precooler, the compressor and the heat exchanger are communicated with each other to form a power generation loop.

15. The regenerative thermal power generation system according to claim 14, wherein the power generation unit further comprises a regenerator, an outer wall surface of the regenerator is provided with a high temperature side inlet, a high temperature side outlet, a low temperature side inlet and a low temperature side outlet, the high temperature side inlet is connected to the turbine and communicated with the turbine, the high temperature side outlet is connected to the precooler and communicated with the precooler, the low temperature side inlet is connected to the compressor and communicated with the compressor, and the low temperature side outlet is connected to the cold side inlet and communicated with the heat exchanger.

16. An energy storage plant, characterized in that it comprises a regenerative thermal power generation system according to any of claims 11-15.