Cold storage and heat storage integrated concrete material based on phase change material as well as preparation method and application of cold storage and heat storage integrated concrete material

Abstract

According to the invention, the phase change material is wrapped in the high molecular polyethylene material to obtain the phase change energy storage microcapsule, and the phase change energy storage microcapsule can be used as a coarse aggregate of the concrete material, and is matched with cement, aggregate, nano silicon and water to form the phase change material-based cold storage and heat storage integrated concrete material. A cement-based material and a phase change material are combined to construct a concrete material with heat storage and cold storage functions. In the phase change process of the phase change material, heat storage, heat release, cold storage and cold release are achieved, and the problem that due to seasonal changes, energy requirements are different is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal-fired power peak regulation, and in particular to a phase change material-based cold and heat storage integrated concrete material, and a preparation method and application thereof. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] In recent years, with the rapid growth of installed capacity of new energy, the problem of absorbing new energy has become a key issue that needs to be urgently addressed in the power system. Wind power, photovoltaic power and other new energy power generation are affected by climatic conditions and have intermittent and fluctuating characteristics. Their large-scale grid connection has brought challenges to the stable operation of the power grid. In order to ensure the safety and economy of the power system, coal-fired power, as the main resource for grid regulation, plays an indispensable and important role in the peak regulation process. Therefore, it is of great practical significance to further tap the peak regulation potential of coal-fired power units and enhance the grid's ability to absorb new energy.

[0004] Deep peak regulation of coal-fired power requires the unit to reduce the load to 30% or less. However, under low-load operating conditions, the boiler combustion stability and unit thermal efficiency are significantly reduced. To solve this problem, the traditional method usually uses electrode boilers or molten salt heat storage technology to store excess energy in the form of heat energy to reduce power generation. However, this method has a low energy utilization rate when the heat storage heat returns to the system, and it is difficult to give full play to the economic efficiency of the heat storage system. If the heat storage energy is used for industrial gas supply, it may be difficult to achieve timely consumption due to fluctuations in gas supply demand, further increasing the peak regulation pressure of power plants. Therefore, how to optimize the efficiency of energy storage utilization and improve the deep peak regulation capacity of coal-fired power has become a difficult problem that needs to be studied and overcome. At the same time, current energy storage technologies focus more on heat storage, but in actual applications, due to seasonal changes, there are significant differences in energy demand: heating is required in winter, while cooling is required in summer. How to effectively recover and utilize this energy, especially when responding to different seasonal needs, has become a key issue in improving energy utilization and achieving sustainable development. Summary of the invention

[0005] In order to overcome the above problems, the present invention provides a cold and heat storage integrated concrete material based on phase change material, and a preparation method and application thereof.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] In a first aspect of the present invention, there is provided a phase change material-based cold and heat storage integrated concrete material, which comprises the following components in terms of weight percentage:

[0008] Cement 30%-40%, fine aggregate 30%-50%, phase change energy storage microcapsule 15%-20%, nano silicon 0%-5%, and the balance is water.

[0009] In one or more embodiments, the cement is selected from ordinary Portland cement (OPC) or Portland pozzolana cement (PPC).

[0010] In one or more embodiments, the fine aggregate is artificial sand with a particle size less than 300 μm.

[0011] In one or more embodiments, the particle size of the phase change energy storage microcapsules is 1.0 to 1.5 cm.

[0012] In one or more embodiments, the phase-change energy storage microcapsule is a solid particle with a core-shell structure, wherein the shell layer is polyethylene and the core is a phase-change material.

[0013] Preferably, the phase change material is an octanoic acid-nonanoic acid composite binary phase change material, wherein the molar fraction of octanoic acid is 0.8 to 0.83, preferably 0.814.

[0014] In one or more embodiments, the particle size of the nano-silicon is 10 to 100 nm.

[0015] Due to its large specific surface area, nanosilicon can react with hydration products (such as CSH gel) in the cement matrix to generate a denser structure, significantly improving the strength and density of cement.

[0016] In one or more embodiments, the phase change material-based integrated cold and heat storage concrete material includes a water reducing agent.

[0017] Preferably, the water reducer is a polycarboxylate water reducer.

[0018] The second aspect of the present invention provides a method for preparing the cold and heat storage integrated concrete material based on phase change material according to the first aspect, comprising:

[0019] (1) Mixing cement and fine aggregate, adding water, and mixing evenly to obtain a first mixed slurry;

[0020] (2) adding phase change energy storage microcapsules and nano silicon to the first mixed slurry and mixing them evenly to form a cold and heat storage integrated concrete material based on phase change materials;

[0021] (3) Pour the phase change material-based integrated cold and heat storage concrete material into a mold for molding and curing.

[0022] In one or more embodiments, phase change energy storage microcapsules, nano silicon and water reducer are added to the first mixed slurry and mixed evenly to form a cold and heat storage integrated concrete material based on phase change material.

[0023] A third aspect of the present invention provides a power plant heat storage and cold storage power generation peak shaving system, comprising: a unit peak shaving control unit, a thermal power generating unit, and a cold storage and heat storage integrated unit;

[0024] The thermal power generating set is connected to the first inlet of the first heat exchanger through a steam extraction pipeline, the first outlet of the first heat exchanger is connected to the first valve, the first valve is provided with two outlets, including an outlet A and an outlet B, the outlet A is connected to the first inlet of the cold and heat storage integrated unit through a first pipeline, the outlet B is connected to the second inlet of the cold and heat storage integrated unit through a second pipeline, and the second pipeline is provided with a first heat pump;

[0025] The integrated cold and heat storage unit is a cold and heat storage body, and the cold and heat storage body is the cold and heat storage integrated concrete material based on phase change material as described in the first aspect;

[0026] The unit peak-shaving and frequency-regulating control unit is electrically connected to the first valve and the first heat pump respectively.

[0027] In one or more embodiments, the second outlet of the first heat exchanger is connected to the regenerator.

[0028] In one or more embodiments, the integrated cold and heat storage unit is connected to the first inlet of the second heat exchanger through a third pipeline, and the first outlet of the second heat exchanger is connected to the second valve through a fourth pipeline.

[0029] Preferably, the second inlet of the second heat exchanger is connected to the water inlet pipe, and the second outlet of the second heat exchanger is connected to the user-side water pipe.

[0030] Preferably, the second valve is provided with a C outlet, a D outlet and an inlet, the inlet is connected to the fourth pipeline, the C outlet is connected to the second inlet of the first heat exchanger, and the D outlet is connected to the second pipeline.

[0031] Preferably, a second heat pump is provided on the fourth pipeline.

[0032] A fourth aspect of the present invention provides a method for peak-shaving power generation by heat storage and cold storage in a power plant, comprising:

[0033] Based on the grid-connected capacity of new energy sources, a peak-shaving instruction is obtained; the peak-shaving instruction includes low-load peak-shaving and full-load peak-shaving;

[0034] When low load peak regulation is achieved, heat or cold storage is performed using the cold and heat storage integrated concrete material based on phase change materials;

[0035] When full load peak regulation is achieved, the integrated cold and heat storage concrete material based on phase change materials is used to release heat or cool.

[0036] In one or more implementations, the method for obtaining a peak load instruction based on the new energy grid-connected capacity includes:

[0037] When the new energy grid-connected exceeds the set value, obtain low-load peak-shaving instructions;

[0038] When the new energy grid-connected power is lower than the set value, a full-load peak-shaving instruction is obtained.

[0039] In one or more embodiments, when low-load peak regulation is obtained, the method for performing heat storage using the cold and heat storage integrated concrete material based on phase change material includes:

[0040] After the high-temperature steam is extracted, heat exchange occurs with the working medium at the first heat exchanger, and the heated working medium enters the cold and heat storage integrated concrete material, which stores heat.

[0041] In one or more embodiments, when low load peak regulation is obtained, the method for performing cold storage using the cold and heat storage integrated concrete material based on phase change material includes:

[0042] After the high-temperature steam is extracted, heat is exchanged with the working medium at the first heat exchanger, and the heated working medium is converted into cold working medium through a compression refrigeration cycle at the first heat pump, and the cold working medium enters the cold and heat storage integrated concrete material, which stores cold.

[0043] In one or more embodiments, when full load peak regulation is obtained, the method of performing heat release using the cold and heat storage integrated concrete material based on phase change material includes:

[0044] The cold-storage and heat-storage integrated concrete material heats the working medium after heat storage, and the heated working medium enters the user side water pipe and is supplied to the user side after heat exchange through the second heat exchanger.

[0045] In one or more embodiments, when full load peak regulation is obtained, the method for releasing cold by using the cold and heat storage integrated concrete material based on phase change material includes:

[0046] The cold storage and heat storage integrated concrete material cools the working medium after cold storage. The cooled working medium exchanges heat through the second heat exchanger and then enters the user side water pipe to supply the user side.

[0047] The beneficial effects of the present invention are:

[0048] (1) In the present invention, phase change energy storage microcapsules are obtained by encapsulating phase change materials in polymer polyethylene materials. The phase change energy storage microcapsules can be used as coarse aggregates of concrete materials, and combined with cement, aggregates, nano-silicon and water to form integrated cold and heat storage concrete materials based on phase change materials. Cement-based materials are combined with phase change materials to construct concrete materials with heat storage and cold storage. In the process of phase change, phase change materials can store heat and release heat, store cold and release cold, and solve the difference in energy demand due to seasonal changes.

[0049] (2) The phase change material used in the present invention is a composite binary phase change material of octanoic acid and nonanoic acid. The composite binary phase change material undergoes a solid-liquid phase change at 7.6°C, and can effectively absorb excess heat, thereby maintaining the temperature stability of the system. The binary system has a high latent heat of fusion, reaching more than 100 J / g, and exhibits a high energy storage density, which is suitable for applications such as cold storage air conditioning and cold chain transportation. In addition, when the molar fraction of octanoic acid is 0.814, the composite binary phase change material exhibits good reversible phase change behavior and has high thermal stability, with a thermal weight loss temperature of about 220°C, which is suitable for long-term low temperature environments. Its glass transition temperature is usually between 0°C and 10°C, ensuring that it maintains good fluidity and phase change efficiency in low temperature environments.

[0050] (2) Cement-based materials can provide a good encapsulation effect for phase change materials, effectively avoiding the leakage problem of phase change materials and enhancing the structural strength of the system.

[0051] (3) Based on the integrated cold storage and heat storage concrete material, the present invention provides a power plant heat storage and cold storage power generation peak shaving system and method. Specifically, when the new energy grid connection exceeds the set value, a low-load peak shaving instruction is obtained; when low-load peak shaving is obtained, the integrated cold storage and heat storage concrete material based on phase change material is used to perform heat storage or cold storage; when storing heat, after the high-temperature steam is extracted, heat exchange occurs with the working medium at the first heat exchanger, and the heated working medium enters the integrated cold storage and heat storage concrete material, and the integrated cold storage and heat storage concrete material stores heat. When storing cold, after the high-temperature steam is extracted, heat exchange occurs with the working medium at the first heat exchanger, and the heated working medium is converted into cold working medium through a compression refrigeration cycle at the first heat pump, and the cold working medium enters the integrated cold storage and heat storage concrete material, and the integrated cold storage and heat storage concrete material stores cold. When the new energy grid connection is lower than the set value, a full-load peak shaving instruction is obtained. When full-load peak shaving is obtained, the integrated cold storage and heat storage concrete material based on phase change material is used to release heat or release cold. When releasing heat, the integrated cold storage and heat storage concrete material after heat storage heats the working fluid, and the heated working fluid enters the second heat exchanger to exchange heat with the working fluid in the inlet and outlet water pipes on the user side, and the heated working fluid in the inlet and outlet water pipes on the user side is supplied to the user side. When releasing cold, the integrated cold storage and heat storage concrete material after cold storage cools the working fluid, and the cooled working fluid enters the second heat exchanger to exchange heat with the working fluid in the inlet and outlet water pipes on the user side, and the cooled working fluid in the inlet and outlet water pipes on the user side is supplied to the user side. In the process of phase change, the phase change material realizes heat storage and heat release, cold storage and cold release, which solves the difference in energy demand due to seasonal changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0053] Figure 1 This is a schematic diagram of the structure of the heat storage and cold storage peak-shaving power generation system of a power plant, where a is a schematic diagram of the structure when storing heat and releasing heat, and b is a schematic diagram of the structure when storing cold and releasing cold;

[0054] Figure 2 It is a structural schematic diagram of the cold and heat storage integrated unit 5;

[0055] Among them, 1-first heat exchanger, 2-first valve, 3-first pipeline, 4-second pipeline, 5-cold and heat storage integrated unit, 6-first heat pump, 7-third pipeline, 8-second heat exchanger, 9-fourth pipeline, 10-second heat pump, 11-steam extraction pipeline, 12-recooler, 13-water inlet pipe, 14-user side water pipe, 15-second valve, 16-flow meter, 5.1-fine aggregate, 5.2-working fluid delivery pipe, 5.3-phase change energy storage microcapsule. DETAILED DESCRIPTION

[0056] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0057] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0058] Example 1

[0059] Preparation of specific phase change energy storage microcapsules:

[0060] The material is prepared by an emulsification coating method, including: emulsification, coating, drying and curing. In the emulsification process, the phase change material is mixed with a solution of polymethyl methacrylate (PMMA), an external coating material, and the emulsifier polyvinyl alcohol (PVA) is used to promote the uniform dispersion of the phase change material in the solution. The surfactant sodium dodecyl sulfate (SDS) (0.5-2wt% by mass) is used to reduce the interfacial tension between the phase change material and the coating material, so that the two form a stable emulsion. Subsequently, the emulsified solution is further processed in the coating process so that the coating material (polyethylene) is evenly wrapped on the surface of the phase change material. The solvent or moisture introduced in the emulsification process is removed by drying at low temperature (50°C), so that the coating layer forms a solid solid structure, and the drying is carried out by hot air drying. After drying, the preparation process is finally completed by ultraviolet curing.

[0061] Example 2

[0062] Specific preparation of cold and heat storage integrated concrete materials based on phase change materials:

[0063] In order to prepare thermal storage and cold storage integrated cement, ordinary Portland cement (OPC) is selected as the basic binder. In terms of aggregate, artificial sand (M sand) with a particle size of less than 300 μm is used. Its uniform particle size helps to form a dense matrix structure with cement. Polyethylene capsules are used as coarse aggregates as encapsulation carriers of phase change materials (PCM). In order to further optimize the mechanical properties of cement, a small amount of nanosilicon is introduced. Due to its large specific surface area, nanosilicon can react with hydration products (such as CSH gel) in the cement matrix to generate a denser structure, significantly improving the strength and density of cement.

[0064] First, the fine aggregate M sand is screened to remove larger impurities. Cement and M sand are dry mixed in a ratio of 1:2 to ensure that the two are evenly distributed. Water is slowly added to control the water-cement ratio to 0.4-0.5, and the uniformity of the cement paste is ensured. During this process, polyethylene capsules and nanosilicon are added to the mixture in proportion, and stirring is continued to ensure that the capsules are evenly distributed in the cement matrix. Nanosilicon and water reducer used at the same time should be added together at this stage so that the nanosilicon can fully react with the cement matrix. After mixing, the mixture is poured into a pre-prepared mold to make cement boards or bricks of the desired shape. The sample needs to be left at room temperature for 24 hours, then demolded and cured for 28 days to ensure that the cement matrix is ​​fully hydrated.

[0065] Example 3

[0066] Figure 1 This is the structural diagram of the thermal storage and cold storage peak-shaving system of the power plant. Figure 1 The power plant heat storage and cold storage power generation peak shaving system includes: a unit peak shaving control unit, a thermal power generating unit, and a cold storage and heat storage integrated unit 5;

[0067] The thermal power generating set is connected to the first inlet of the first heat exchanger 1 through the steam extraction pipeline 11, and the first outlet of the first heat exchanger 1 is connected to the first valve 2. The first valve 2 is provided with two outlets, including an outlet A and an outlet B. The outlet A is connected to the first inlet of the cold and heat storage integrated unit 5 through the first pipeline 3, and the outlet B is connected to the second inlet of the cold and heat storage integrated unit 5 through the second pipeline 4. The first heat pump 6 is provided on the second pipeline;

[0068] The integrated cold and heat storage unit 5 is a cold and heat storage body, and the cold and heat storage body is the cold and heat storage integrated concrete material based on phase change material described in Example 2;

[0069] The second outlet of the first heat exchanger 1 is connected to the recooler 12 .

[0070] The cold and heat storage integrated unit 5 is connected to the first inlet of the second heat exchanger 8 through the third pipe 7, and the first outlet of the second heat exchanger 8 is connected to the inlet of the second valve 15 through the fourth pipe 9. The second inlet of the second heat exchanger 8 is connected to the water inlet pipe 13, and the second outlet of the second heat exchanger 8 is connected to the user-side water pipe 14.

[0071] The second valve 15 is provided with a C outlet, a D outlet and an inlet, the inlet is connected to the fourth pipeline 10 , the C outlet is connected to the second inlet of the first heat exchanger 1 , and the D outlet is connected to the second pipeline 4 .

[0072] A second heat pump 10 is arranged on the fourth pipeline 9 .

[0073] The unit peak-shaving and frequency-regulating control unit is electrically connected to the first valve 2, the second valve 15, the first heat pump 6, and the second heat pump 10 respectively.

[0074] Figure 2 Schematic diagram of the structure of the cold and heat storage integrated unit 5, the cold and heat storage integrated unit 5 comprises a cold and heat storage body, and a working medium conveying pipe 5.2 is pre-buried in the cold and heat storage body;

[0075] In order to increase the efficiency of heat dissipation or cold release, the working medium conveying pipe is arranged in a circuitous shape inside the cold and heat storage body.

[0076] The working method of the thermal storage and cold storage power generation peak regulation system of the power plant includes:

[0077] ① The integrated cold and heat storage unit 5 performs heat storage:

[0078] The high-temperature steam generated by the thermal power generating set enters the first heat exchanger 1 through the steam extraction pipe 11 to exchange heat with the working medium. The heated working medium enters the first pipe 3 through the A outlet of the first valve 2, and then enters the cold and heat storage integrated unit 5 for heat storage.

[0079] ② The integrated cold and heat storage unit 5 performs cold storage:

[0080] The high-temperature steam generated by the thermal power generating set enters the first heat exchanger 1 through the steam extraction pipe 11, exchanges heat with the working medium, and the heated working medium enters the second pipe 4 through the B outlet of the first valve 2. The hot working medium is converted into cold working medium through the compression refrigeration cycle at the first heat pump 6, and the cold working medium enters the cold and heat storage integrated unit 5 for cold storage.

[0081] During the above cold storage and heat storage process, if the cold storage and heat storage integrated unit 5 does not release heat or cold, the working medium after heat storage or cold storage in the cold storage and heat storage integrated unit 5 returns to the second valve 15 through the third pipeline 7 and the fourth pipeline 9. During heat storage, the working medium enters the first heat exchanger 1 through the C outlet of the second valve 15, and the working medium is recycled. During cold storage, the working medium enters the second pipeline 4 through the D outlet of the second valve 15, and the working medium is recycled.

[0082] ③ The integrated cold and heat storage unit 5 releases heat:

[0083] The integrated cold storage and heat storage unit 5 after heat storage heats the working medium in the working medium delivery pipe 5.2 embedded in the cold storage and heat storage body, and the heated working medium enters the second heat exchanger 8 to exchange heat with the working medium in the water inlet pipe 13. The heated working medium in the water inlet pipe 13 enters the user side water pipe 14 to be supplied to the user side; after heat exchange, the working medium in the working medium delivery pipe 5.2 enters the first heat exchanger 1 through the fourth pipeline 9 and the C outlet of the second valve under the action of the second heat pump 10, and the working medium is recycled.

[0084] ④ The integrated cold and heat storage unit 5 releases cold:

[0085] The integrated cold storage and heat storage unit 5 after heat storage cools the cold storage and heat storage body in which the working medium in the working medium delivery pipe 5.2 is pre-buried. The cooled working medium enters the second heat exchanger 8 and exchanges heat with the working medium in the water inlet pipe 13. The cooled working medium in the water inlet pipe 13 enters the user side water pipe 14 and is supplied to the user side. After heat exchange, the working medium in the working medium delivery pipe 5.2 enters the second pipe 4 through the fourth pipe 9 and the D outlet of the second valve under the action of the second heat pump 10, and the working medium is recycled.

[0086] Example 4

[0087] A method for peak-shaving power generation by heat storage and cold storage in a power plant, specifically, when the new energy grid connection exceeds the set value, a low-load peak-shaving instruction is obtained; when low-load peak-shaving is obtained, heat storage or cold storage is performed using cold storage and heat storage integrated concrete materials based on phase change materials; when heat storage is performed, high-temperature steam is extracted and heat exchange is performed with the working medium at the first heat exchanger, and the heated working medium enters the cold storage and heat storage integrated concrete materials, and the cold storage and heat storage integrated concrete materials store heat. When cold storage is performed, high-temperature steam is extracted and heat exchange is performed with the working medium at the first heat exchanger, and the heated working medium is converted into cold working medium through a compression refrigeration cycle at the first heat pump, and the cold working medium enters the cold storage and heat storage integrated concrete materials, and the cold storage and heat storage integrated concrete materials store cold. When the new energy grid connection is lower than the set value, a full-load peak-shaving instruction is obtained. When full-load peak-shaving is obtained, heat release or cold release is performed using cold storage and heat storage integrated concrete materials based on phase change materials. When releasing heat, the integrated cold storage and heat storage concrete material after heat storage heats the working fluid, and the heated working fluid enters the second heat exchanger to exchange heat with the working fluid in the inlet and outlet water pipes on the user side, and the heated working fluid in the inlet and outlet water pipes on the user side is supplied to the user side. When releasing cold, the integrated cold storage and heat storage concrete material after cold storage cools the working fluid, and the cooled working fluid enters the second heat exchanger to exchange heat with the working fluid in the inlet and outlet water pipes on the user side, and the cooled working fluid in the inlet and outlet water pipes on the user side is supplied to the user side. In the process of phase change, the phase change material realizes heat storage and heat release, cold storage and cold release, which solves the difference in energy demand due to seasonal changes.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A phase change material-based cold and heat storage integrated concrete material, characterized in that: According to weight percentage, it includes the following components: Cement 30%-40%, fine aggregate 30%-50%, phase change energy storage microcapsule 15%-20%, nano silicon 0%-5%, and the balance is water.

2. The phase change material-based cold and heat storage integrated concrete material according to claim 1, characterized in that: The cement is selected from one of ordinary Portland cement (OPC) or Portland pozzolana cement (PPC); The fine aggregate is artificial sand with a particle size of less than 300 μm; Or, the particle size of the phase change energy storage microcapsule is 1.0 to 1.5 cm; Or, the phase-change energy storage microcapsule is a solid particle with a core-shell structure, the shell layer of which is polyethylene, and the core of which is a phase-change material; preferably, the phase-change material is a composite binary phase-change material of octanoic acid and nonanoic acid, wherein the molar fraction of octanoic acid is 0.8 to 0.83, preferably 0.814; Alternatively, the particle size of the nano-silicon is 10 to 100 nm.

3. The method for preparing the cold and heat storage integrated concrete material based on phase change material according to claim 1 or 2, characterized in that: include: (1) Mixing cement and fine aggregate, adding water, and mixing evenly to obtain a first mixed slurry; (2) adding phase change energy storage microcapsules and nano silicon to the first mixed slurry and mixing them evenly to form a cold and heat storage integrated concrete material based on phase change materials; (3) Pour the phase change material-based integrated cold and heat storage concrete material into a mold for molding and curing.

4. A power plant heat storage and cold storage power generation peak regulation system, characterized in that: include: Unit peak load regulation control unit, thermal power generating unit and integrated cold and heat storage unit; The thermal power generating set is connected to the first inlet of the first heat exchanger through a steam extraction pipeline, the first outlet of the first heat exchanger is connected to the first valve, the first valve is provided with two outlets, including an outlet A and an outlet B, the outlet A is connected to the first inlet of the cold and heat storage integrated unit through a first pipeline, the outlet B is connected to the second inlet of the cold and heat storage integrated unit through a second pipeline, and the second pipeline is provided with a first heat pump; The integrated cold and heat storage unit is a cold and heat storage body, and the cold and heat storage body is the cold and heat storage integrated concrete material based on phase change material according to claim 1 or 2; The unit peak-shaving and frequency-regulating control unit is electrically connected to the first valve and the first heat pump respectively.

5. The power plant heat storage and cold storage power generation peak-shaving system according to claim 4, characterized in that: The second outlet of the first heat exchanger is connected to the recooler; Alternatively, the cold and heat storage integrated unit is connected to the first inlet of the second heat exchanger through a third pipeline, and the first outlet of the second heat exchanger is connected to the second valve through a fourth pipeline.

6. The power plant heat storage and cold storage power generation peak-shaving system according to claim 6, characterized in that: The second inlet of the second heat exchanger is connected to the water inlet pipe, and the second outlet of the second heat exchanger is connected to the user-side water pipe; Or, the second valve is provided with a C outlet, a D outlet and an inlet, the inlet is connected to the fourth pipeline, the C outlet is connected to the second inlet of the first heat exchanger, and the D outlet is connected to the second pipeline; Alternatively, a second heat pump is provided on the fourth pipeline.

7. A method for peak load regulation of power generation by heat storage and cold storage in a power plant, characterized in that: include: Based on the grid-connected capacity of new energy sources, a peak-shaving instruction is obtained; the peak-shaving instruction includes low-load peak-shaving and full-load peak-shaving; When low load peak regulation is achieved, heat or cold storage is performed using the cold and heat storage integrated concrete material based on phase change materials; When full load peak regulation is achieved, the integrated cold and heat storage concrete material based on phase change materials is used to release heat or cool.

8. The power plant heat storage and cold storage peak load regulation method according to claim 7, characterized in that: Based on the grid-connected capacity of new energy sources, the methods for obtaining peak load instructions include: When the new energy grid-connected exceeds the set value, obtain low-load peak-shaving instructions; When the new energy grid-connected power is lower than the set value, a full-load peak-shaving instruction is obtained.

9. The power plant heat storage and cold storage peak load regulation method according to claim 7, characterized in that: When low load peak regulation is obtained, the method for performing heat storage using the cold and heat storage integrated concrete material based on phase change material includes: After the high-temperature steam is extracted, heat exchange occurs with the working medium at the first heat exchanger, and the heated working medium enters the cold and heat storage integrated concrete material, and the cold and heat storage integrated concrete material stores heat; Or, when low load peak regulation is obtained, the method for performing cold storage using the cold and heat storage integrated concrete material based on phase change material includes: After the high-temperature steam is extracted, heat is exchanged with the working medium at the first heat exchanger, and the heated working medium is converted into cold working medium through a compression refrigeration cycle at the first heat pump, and the cold working medium enters the cold and heat storage integrated concrete material, which stores cold.

10. The power plant heat storage and cold storage peak load regulation method according to claim 7, characterized in that: When full load peak regulation is obtained, the method of performing heat release using the cold and heat storage integrated concrete material based on phase change material includes: The cold and heat storage integrated concrete material heats the working medium after heat storage, and the heated working medium passes through the second heat exchanger and then enters the user side water pipe to supply the user side; Or, when full load peak regulation is obtained, the method of releasing cold by using the cold and heat storage integrated concrete material based on phase change material includes: The cold storage and heat storage integrated concrete material cools the working medium after cold storage. The cooled working medium exchanges heat through the second heat exchanger and then enters the user side water pipe to supply the user side.

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