A plate heat exchanger with heat storage and nuclear radiation protection functions and a processing method thereof

Abstract

The present invention discloses a plate heat exchanger with heat storage and nuclear radiation protection functions and a processing method thereof. The plate heat exchanger is arranged in a circular manner in the form of a hot water plate, a first heat storage plate, a second heat storage plate, a cold water plate, a second heat storage plate, a first heat storage plate, and a hot water plate to form a honeycomb structure; a hot fluid channel is formed between the hot water plate and the first heat storage plate, a phase change material channel is formed between the first heat storage plate and the second heat storage plate, a cold fluid channel phase change material channel is formed between the second heat storage plate and the cold water plate, and the cold water plate and another second heat storage plate form a cold fluid channel, and the phase change material is paraffin; the present invention changes the previous two-layer plate heat exchanger into a three-layer plate heat exchanger and adopts a three-channel form, so that the heat exchange efficiency is high; at the same time, the phase change material layer is composed of two plates, and this structure is not only exquisite in structure and convenient in processing, but also accelerates the heat exchange rate, and the phase change material fluid layer is also provided with two layers of oil, and this structure is exquisite and realizes the radiation protection function.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers for nuclear power, and in particular to a plate heat exchanger with heat storage and nuclear radiation protection functions and a processing method thereof. Background Art

[0002] Cogeneration is an important technology to improve the energy efficiency of power plants. Usually, the heat production of thermal power plants is continuous and stable, while the energy consumption time in heating is highly volatile. Luan Xiaojuan et al. mentioned in the article "Thermal Storage Technology and Its Application in Power Peak Shaving" that the peak time of power energy consumption is often during the day and summer, while the heating demand is at the low point of energy consumption time, such as at night and in winter. In order to solve the problem of mismatch in the utilization time of waste heat energy in power plants, China's utility model patent CN219624139U discloses a heating system supplementary heat and thermoelectric auxiliary peak shaving system based on phase change heat storage, and introduces heat storage technology. Heat storage technology can store heat that exceeds the heating demand and release it during peak energy consumption to provide more heating capacity. Through the application of heat storage peak shaving technology, waste heat can be utilized to the maximum extent, the problem of mismatch between energy utilization time and energy consumption time can be alleviated or eliminated, and the clean, safe, economical use and sustainable development of energy can be promoted.

[0003] As a clean, safe, and carbon-free energy source, nuclear energy has become increasingly important in energy conservation and emission reduction. Exploring the utilization of waste heat from nuclear power has many values ​​in terms of environmental protection, energy conservation, and economic benefit improvement. China's invention CN116066892A discloses a method and system for combined cooling and heating based on nuclear energy combined with a heat pump, and proposes nuclear energy heating, which uses steam extracted from nuclear power plant turbines to heat surrounding buildings in winter. However, due to the high electricity load during the daytime working hours, if the waste heat from nuclear power plants is used for heating during this period, the power generation will be reduced, resulting in insufficient power generation or insufficient heat supply. Therefore, there is a problem of mismatch in energy utilization time in nuclear energy heating.

[0004] At the same time, nuclear power heating needs to take necessary and sufficient monitoring, protection, prevention and other safety measures to protect workers, the public and the environment from improper radiation hazards. Therefore, strict radiation detection technology and safety control are adopted in nuclear power heating. At present, radiation monitoring devices are usually used to monitor the radiation of circulating water in real time. For example, Chinese utility model patent CN217519928U discloses a high-temperature fluid radiation monitoring device and a nuclear power heating system, which uses a high-temperature fluid radiation device composed of a heat exchanger, a pipeline, a radiation monitoring device and a temperature sensor. It can be set on the heating network, so that the radiation of circulating water can be monitored in real time. In the event of a nuclear leak, the heating system is shut down in time to prevent the transmission of circulating water with radiation to residential areas. However, the technology of radiation detection is a passive protection measure, which can only take measures after the radiation occurs, and cannot directly play a radiation protection role in the heating process.

[0005] Therefore, the current nuclear heating system has two key problems: (1) it is difficult to match the time of heat supply and heat use; (2) there is no active prevention of the transfer of radiation from the nuclear power high-temperature heat source to the civilian heating medium. In summary, solving the above two problems can balance the stability of nuclear power plant energy production and heating demand, and improve the energy efficiency and economy of nuclear heating. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a plate heat exchanger with heat storage and nuclear radiation protection functions and a processing method thereof, which is suitable for nuclear power hot water heating and has heat storage and radiation protection functions.

[0007] The technical solution of the present invention is as follows:

[0008] In a first aspect of the present invention, a plate heat exchanger with heat storage and nuclear radiation protection functions is provided, comprising a hot water plate and a cold water plate, wherein a first heat storage plate and a second heat storage plate are arranged between the hot water plate and the cold water plate, and the hot water plate, the first heat storage plate, the second heat storage plate and the cold water plate are stacked in sequence to form a honeycomb structure; a hot fluid channel is formed between the hot water plate and the first heat storage plate, a phase change material channel is formed between the first heat storage plate and the second heat storage plate, a cold fluid channel phase change material channel is formed between the second heat storage plate and the cold water plate, a cold fluid channel is formed between the cold water plate and another second heat storage plate, and the phase change material is paraffin.

[0009] In some embodiments of the present invention, the hot water plate is a rectangular plate structure, a hot water inlet is set at one end of the hot water plate, and a hot water outlet is set at the other end; the cold water plate is a rectangular plate structure, a cold water inlet is set at one end of the cold water plate, and a cold water outlet is set at the other end.

[0010] In some embodiments of the present invention, the hot water inlet of the hot water plate and the cold water outlet of the cold water plate are arranged on the same side, and the hot water outlet of the hot water plate and the cold water inlet of the cold water plate are arranged on the same side.

[0011] In some embodiments of the present invention, a plurality of strip-shaped quadrilateral flow channel protrusions are provided in the middle of the hot water plate and the cold water plate, and a plurality of hemispherical protrusions are provided in the buffer areas on both sides of the quadrilateral flow channel protrusions.

[0012] In some embodiments of the present invention, baffles are provided on the sides of the hot water inlet, the hot water outlet, the cold water inlet and the cold water outlet, and are welded to form inlet and outlet channels for cold water and hot water.

[0013] In some embodiments of the present invention, the first heat storage plate and the second heat storage plate adopt a rectangular plate structure, and a phase change material inlet is arranged on one side of the heat storage plate, and a phase change material outlet is arranged on the other side.

[0014] In some embodiments of the present invention, a plurality of strip-shaped quadrilateral flow channel protrusions are disposed in the middle of the first heat storage plate and the second heat storage plate, and a plurality of hemispherical protrusions are disposed in the buffer regions on both sides of the quadrilateral flow channel protrusions.

[0015] In some embodiments of the present invention, the hot water plates and cold water plates are arranged in multiple groups in an alternating manner, both sides of the hot water plates are first heat storage plates, and both sides of the cold water plates are second heat storage plates.

[0016] In some embodiments of the present invention, edges of the cold water plate, the hot water plate, the first heat storage plate and the second heat storage plate are provided with folded edges.

[0017] In a second aspect of the present invention, a method for processing a plate heat exchanger having heat storage and nuclear radiation protection functions is provided, comprising the following steps:

[0018] The hot water plate, the first heat storage plate, the second heat storage plate and the cold water plate are respectively formed by stamping stainless steel plates;

[0019] The hot water plate, the first heat storage plate, the second heat storage plate, the cold water plate, the second heat storage plate, the first heat storage plate, and the hot water plate are stacked and welded in sequence, and the folded edge of one plate is welded and fixed to the back edge of another plate during welding;

[0020] Channel baffles are added to the outside of the hot and cold channels and the phase change material channels, and are welded to form inlet and outlet channels for high-temperature medium, low-temperature medium and phase change material. Both ends of the heat exchanger body are closed by sealing plates.

[0021] One or more technical solutions of the present invention have the following beneficial effects:

[0022] (1) The plate heat exchanger provided by the present invention is composed of three types of sealing plates. The first type is a high-temperature fluid layer, the second type is a two-layer phase change material (paraffin) heat storage layer, and the third type is a low-temperature fluid layer. Before use, the melted paraffin is poured into the middle layer and discharged through the paraffin outlet at the bottom during maintenance. The paraffin does not need to be replaced during normal operation, and it is not discharged after pouring. During operation, hot water enters from the top and is discharged from the bottom; cold water enters from the bottom and is discharged from the top; the strict countercurrent of hot and cold fluids can improve the heat exchange efficiency. The present invention uses the contact surface as the heat transfer surface, and has the characteristics of compact structure, high heat transfer efficiency, not easy to pollute, and small flow resistance.

[0023] (2) The plate heat exchanger provided by the present invention changes the conventional double-channel plate heat exchanger into a three-channel plate heat exchanger, which has high heat exchange efficiency. At the same time, the phase change material layer is composed of four plates. The double-layer phase change material honeycomb channel produced by this structure can isolate the diffusion of radiation, is easy to process, and has a high heat exchange rate.

[0024] (3) The present invention uses phase-change paraffin as a radiation isolation layer to absorb radiation particles brought out by nuclear power hot water / steam, actively defend against the radiation source conduction of cold and hot fluids, and has higher safety; at the same time, paraffin, as an intermediate phase-change heat storage material, can store a large amount of latent heat and sensible heat of temperature rise through phase change, and the total heat storage capacity is large. According to the temperature of the heat source, selecting a phase-change paraffin close to the heat source temperature can effectively improve the thermal quality of heat storage.

[0025] (4) The present invention makes full use of nuclear energy for heating, improves energy utilization efficiency, saves energy, and achieves comprehensive utilization of nuclear energy. It can alleviate the smog weather and environmental pollution caused by the use of fossil fuels for heating. It is low-carbon, clean, and environmentally friendly.

[0026] (5) The present invention can extract steam from the steam turbine for heating and heat storage during the off-peak period of electricity consumption in the heating season. The stored heat is used for heating during the peak period of electricity consumption, which can fully utilize nuclear energy and alleviate the problem of insufficient energy supply during the peak period of electricity consumption when nuclear power plants provide both electricity and heating. It can realize heat storage and peak regulation, save energy, and achieve comprehensive utilization of nuclear energy.

[0027] (6) The plate heat exchanger of the present invention is easy to manufacture and has a high pressure bearing capacity. It has a good pressure bearing capacity for heat sources such as hot water and steam in nuclear power plants. It adopts a welding method, has good sealing performance and high pressure bearing capacity. The flow cross-section is simple, which reduces the fluid flow resistance. At the same time, through the setting of the honeycomb structure, the heat exchange area is larger, thereby improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of a plate heat exchanger with heat storage and nuclear radiation protection functions of the present invention;

[0029] Figure 2 A plan view of a hot water plate of the present invention;

[0030] Figure 3 A three-dimensional diagram of a hot water panel of the present invention;

[0031] Figure 4 A plan view of a cold water plate of the present invention;

[0032] Figure 5 A three-dimensional diagram of the cold water plate of the present invention;

[0033] Figure 6 is a plan view of a first heat storage plate of the present invention;

[0034] Figure 7 A three-dimensional diagram of the first heat storage plate of the present invention;

[0035] Figure 8 is a plan view of a second heat storage plate of the present invention;

[0036] Fig. 9 A three-dimensional diagram of the second heat storage plate of the present invention;

[0037] Fig.10 It is a plan view of the plate heat exchanger with heat storage and nuclear radiation protection functions of the present invention;

[0038] Fig.11 This is a schematic diagram of the internal honeycomb structure of the plate heat exchanger with heat storage and nuclear radiation protection functions of the present invention;

[0039] Fig.12 It is a schematic diagram of the flow channel structure of each cold and hot fluid and phase change material of the present invention;

[0040] Fig.13 It is a schematic diagram of the structure of the fluid inlet and outlet positions of the plate heat exchanger with heat storage and nuclear radiation protection functions of the present invention;

[0041] Fig.14 It is a schematic diagram of the flow direction of the internal heat exchanger of the plate heat exchanger with heat storage and nuclear radiation protection functions of the present invention.

[0042] In the figure: 1. hot water inlet; 2. phase change material inlet; 3. cold water outlet; 4. hot water outlet; 5. phase change material outlet; 6. cold water inlet; 7. baffle; 8. hot water plate; 9. cold water plate; 10. first heat storage plate; 11. second heat storage plate; 12. quadrilateral flow channel protrusion; 13. hemispherical protrusion; 14. arc-shaped protrusion. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] Example 1

[0045] In a typical embodiment of the present invention, a plate heat exchanger with heat storage and nuclear radiation protection functions is proposed, such as Figure 1 As shown, it includes a hot water plate 8 and a cold water plate 9, a first heat storage plate 10 and a second heat storage plate 11 are arranged between the hot water plate 8 and the cold water plate 9, and the hot water plate 8, the first heat storage plate 10, the second heat storage plate 11, the cold water plate 9, the second heat storage plate 11, the first heat storage plate 10, and the hot water plate 8 are arranged in a circular manner to form a honeycomb structure; a hot fluid channel is formed between the hot water plate 8 and the first heat storage plate 10, a phase change material channel is formed between the first heat storage plate 10 and the second heat storage plate 11, a cold fluid channel phase change material channel is formed between the second heat storage plate 11 and the cold water plate 9, and the cold water plate 9 forms a cold fluid channel with another second heat storage plate, and the phase change material is paraffin, which has low radiation transmission rate, good radiation loss resistance and good radiation absorption capacity, and can well absorb different types of radiation such as β, γ (gamma rays), X-rays, neutrons, etc.

[0046] like Figure 2 and Figure 3 As shown, the hot water plate 8 is a rectangular plate structure, a hot water inlet 1 is arranged at one end of the hot water plate, and a hot water outlet 4 is arranged at the other end, and the hot water inlet and the hot water outlet are arranged on one side of the wide side of the hot water plate to form a T structure, and a plurality of strip-shaped quadrilateral flow channel protrusions 12 are arranged in the middle position of the plate surface of the hot water plate 8, and a plurality of hemispherical protrusions 13 are arranged in the buffer areas on both sides of the quadrilateral flow channel protrusions 12, and an arc-shaped protrusion 14 is also arranged on the buffer area of ​​the hot water plate 8. The height of the arc-shaped protrusion is the same as that of the quadrilateral flow channel protrusion, which can play a role in controlling the flow direction of the fluid.

[0047] like Figure 4 and Figure 5 As shown, a cold water inlet 6 is provided at one end of the cold water plate 9, and a cold water outlet 3 is provided at the other end. The hot water inlet of the hot water plate and the cold water outlet of the cold water plate are provided on the same side, and the hot water outlet of the hot water plate and the cold water inlet of the cold water plate are provided on the same side to achieve the counterflow of cold water and hot water. A plurality of strip-shaped quadrilateral flow channel protrusions 12 are provided in the middle of the plate surface of the cold water plate 9, and a plurality of hemispherical protrusions 13 are provided at the buffer areas on both sides of the quadrilateral flow channel protrusions 12. The positions of the strip-shaped protrusions in the heat exchange areas on the cold water plate 9 and the hot water plate 8 are different, so that each heat exchange plate can form a honeycomb structure when stacked. An arc-shaped protrusion 14 is also provided on the buffer area of ​​the cold water plate 9, and the height of the arc-shaped protrusion 14 is the same as that of the quadrilateral flow channel protrusion, which can play a role in controlling the flow direction of the fluid.

[0048] In this embodiment, baffles 7 are provided on the sides of the hot water inlet, the hot water outlet, the cold water inlet and the cold water outlet, and are welded to form inlet and outlet channels for cold water and hot water.

[0049] like Figure 6 and Figure 7 As shown, the first heat storage plate 10 adopts a rectangular plate structure, a phase change material inlet 2 is arranged on one side of the first heat storage plate 10, and a phase change material outlet 5 is arranged on the other side, the phase change material inlet 2 and the phase change material outlet 5 are arranged in the middle position of the wide side of the first heat storage plate to be separated from the inlets and outlets on the hot water plate and the cold water plate, a plurality of strip-shaped quadrilateral flow channel protrusions 12 are arranged in the middle position of the first heat storage plate 10, and a plurality of hemispherical protrusions 13 are arranged in the buffer areas on both sides of the quadrilateral flow channel protrusion 12.

[0050] like Figure 8 and Fig. 9As shown, the second heat storage plate 11 adopts a rectangular plate structure, a phase change material inlet 2 is arranged on one side of the second heat storage plate 11, and a phase change material outlet 5 is arranged on the other side. The phase change material inlet 2 and the phase change material outlet 5 are arranged in the middle position of the wide side of the second heat storage plate to separate from the inlet and outlet on the hot water plate and the cold water plate. A plurality of strip-shaped quadrilateral flow channel protrusions 12 are arranged in the middle position of the second heat storage plate 11, and a plurality of hemispherical protrusions 13 are arranged in the buffer area on both sides of the quadrilateral flow channel protrusion 12. The positions of the quadrilateral flow channel protrusions in the heat exchange area on the first heat storage plate 10 and the second heat storage plate 11 are different.

[0051] like Figure 10-12 As shown, the hot water plate 8 and the cold water plate 9 are arranged in multiple groups in an alternating manner. Specifically, the hot water plate 8, the first heat storage plate 10, the second heat storage plate 11, the cold water plate 9, the second heat storage plate 11, the first heat storage plate 10, and the hot water plate 8 are stacked in this manner, so that the fluid flows in the plate heat exchanger in the manner of hot fluid, phase change material, phase change material, cold fluid, phase change material, phase change material, and hot fluid. After multiple heat exchange plates are stacked, the quadrilateral flow channel protrusions on the heat exchange plate form a regular hexagonal honeycomb structure flow channel. The honeycomb structure has the advantages of increasing the heat exchange area and improving the heat exchange efficiency. The hemispherical protrusions arranged on the heat exchange plate have the functions of supporting and guiding. In order to evenly distribute the inlet fluid to the honeycomb channel, the hemispherical supports close to the inlet and outlet sides are densely arranged, and the hemispherical supports away from the inlet and outlet sides are sparsely arranged. At the same time, the hemispherical arrangement is arranged along the streamline toward the honeycomb inlet, which has a guiding effect.

[0052] The four boards are composed as follows Fig.12 As shown, the hot water plate 8, the first heat storage plate 10, the second heat storage plate 11, the cold water plate 9, the second heat storage plate 11, the first heat storage plate 10, and the hot water plate 8 are placed in sequence, and a heat exchanger is formed in sequence according to this cycle. In addition, the first heat storage plate and the second heat storage plate are alternately arranged in sequence as they are stacked.

[0053] In this embodiment, the phase change heat storage layer adopts a two-layer design. Fig.12 As shown, when the hot water plate 8 is connected to the first heat storage plate 10, there is a part of the area between the two plates without phase change material. In order to completely isolate the high-temperature heat source from radiating matter to the low-temperature heat source, two layers of phase change material are used, and the phase change material is filled between the first heat storage plate 10 and the second heat storage plate 11, and between the second heat storage plate 11 and the cold water plate 9. At the same time, the double-layer phase change material layer can also play a role in increasing the heat storage capacity of the heat exchanger.

[0054] In this embodiment, the edges of the cold water plate, the hot water plate, the first heat storage plate and the second heat storage plate are provided with folded edges to facilitate welding with adjacent heat exchange plates. Welding processing method: After the plate is manufactured, according to the arrangement of the hot water plate, the first heat storage plate, the second heat storage plate, the cold water plate, the second heat storage plate, the first heat storage plate and the hot water plate, channel baffles are added on the side and outside of the channel, and the cold water, phase change material and hot water inlet and outlet channels are formed by welding, and end plates are welded on both sides, and lead cores are added in the end plates to prevent nuclear radiation from leaking outward, and the manufacture of the welded heat exchanger is completed.

[0055] like Fig.13 and Fig.14 As shown, before use, melted paraffin is poured into the first heat storage plate and the second heat storage plate and between the second heat storage plate and the cold water plate from the phase change material inlet. During maintenance, the melted paraffin can be discharged from the middle outlet through the phase change material outlet at the bottom. During normal operation, the paraffin does not need to be replaced, that is, it is not discharged after pouring. During operation, hot water enters from the top and is discharged from the bottom; cold water enters from the bottom and is discharged from the top; the heat of the hot water enters the cold water through phase change, and the excess heat is stored by the phase change material. The strict countercurrent of the hot and cold fluids can improve the heat exchange efficiency.

[0056] The working principle of the plate heat exchanger provided in this embodiment is as follows:

[0057] Hot water enters between the hot water plate and the first heat storage plate from the top, and cold water enters between the cold water plate and the second heat storage plate from the bottom, forming a countercurrent between the hot water and the cold water; melted paraffin is injected between the first heat storage plate and the second heat storage plate and between the second heat storage plate and the cold water plate, and heat enters the cold water through the paraffin, and excess heat is stored; while the paraffin is performing phase change heat storage, it prevents the radiation of nuclear power hot water from entering the heating circulating water.

[0058] The plate heat exchanger provided in this embodiment uses the contact surface of the heat exchange plate as the heat transfer surface, and has the characteristics of compact structure, high heat transfer efficiency, low pollution and low flow resistance. At the same time, paraffin is used as the intermediate phase change heat storage material. Paraffin not only stores heat through phase change and has a large heat storage capacity, but is also a good radiation protection material.

[0059] Example 2

[0060] In a typical embodiment of the present invention, a processing method of a plate heat exchanger with heat storage and nuclear radiation protection functions is proposed, comprising the following steps:

[0061] The hot water plate, the first heat storage plate, the second heat storage plate and the cold water plate are respectively formed by stamping stainless steel plates;

[0062] The hot water plate, the first heat storage plate, the second heat storage plate, the cold water plate, the second heat storage plate, the first heat storage plate, and the hot water plate are stacked and welded in sequence, and the folded edge of one plate is welded and fixed to the back edge of another plate during welding;

[0063] Channel baffles are added to the outside of the hot and cold channels and the phase change material channels, and are welded to form inlet and outlet channels for high-temperature medium, low-temperature medium and phase change material. Both ends of the heat exchanger body are closed by sealing plates.

[0064] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A plate heat exchanger with heat storage and nuclear radiation protection functions, characterized in that: It comprises a hot water plate and a cold water plate, wherein a first heat storage plate and a second heat storage plate are arranged between the hot water plate and the cold water plate, and the hot water plate, the first heat storage plate, the second heat storage plate and the cold water plate are stacked in sequence to form a honeycomb structure; a hot fluid channel is formed between the hot water plate and the first heat storage plate, a phase change material channel is formed between the first heat storage plate and the second heat storage plate, a phase change material channel is formed between the second heat storage plate and the cold water plate, and a cold fluid channel is formed between the cold water plate and another second heat storage plate, and the phase change material is paraffin; The hot water plates and the cold water plates are arranged in multiple groups in an alternating manner, both sides of the hot water plates are the first heat storage plates, and both sides of the cold water plates are the second heat storage plates. They are stacked in the manner of hot water plates, first heat storage plates, second heat storage plates, cold water plates, second heat storage plates, first heat storage plates, and hot water plates, so that the fluid flows in the plate heat exchanger in the manner of hot fluid, phase change material, phase change material, cold fluid, phase change material, phase change material, and hot fluid.

2. The plate heat exchanger with heat storage and nuclear radiation protection functions according to claim 1, characterized in that: The hot water plate is a rectangular plate structure, with a hot water inlet at one end and a hot water outlet at the other end; the cold water plate is a rectangular plate structure, with a cold water inlet at one end and a cold water outlet at the other end.

3. The plate heat exchanger with heat storage and nuclear radiation protection functions according to claim 2, characterized in that: The hot water inlet of the hot water plate and the cold water outlet of the cold water plate are arranged on the same side, and the hot water outlet of the hot water plate and the cold water inlet of the cold water plate are arranged on the same side.

4. The plate heat exchanger with heat storage and nuclear radiation protection functions according to claim 2, characterized in that: A plurality of strip-shaped quadrilateral flow channel protrusions are arranged in the middle of the hot water plate and the cold water plate, and a plurality of hemispherical protrusions are arranged at the buffer areas on both sides of the quadrilateral flow channel protrusions.

5. The plate heat exchanger with heat storage and nuclear radiation protection functions according to claim 2, characterized in that: Baffles are arranged on the sides of the hot water inlet, the hot water outlet, the cold water inlet and the cold water outlet, and are welded to form inlet and outlet channels for cold water and hot water.

6. The plate heat exchanger with heat storage and nuclear radiation protection functions according to claim 1, characterized in that: The first heat storage plate and the second heat storage plate adopt a rectangular plate structure, and a phase change material inlet is arranged on one side of the heat storage plate, and a phase change material outlet is arranged on the other side.

7. The plate heat exchanger with heat storage and nuclear radiation protection functions according to claim 1, characterized in that: A plurality of strip-shaped quadrilateral flow channel protrusions are arranged in the middle of the first heat storage plate and the second heat storage plate, and a plurality of hemispherical protrusions are arranged at the buffer areas on both sides of the quadrilateral flow channel protrusions.

8. The plate heat exchanger with heat storage and nuclear radiation protection functions according to claim 1, characterized in that: The edges of the cold water plate, the hot water plate, the first heat storage plate and the second heat storage plate are provided with folded edges.

9. A method for processing a plate heat exchanger with heat storage and nuclear radiation protection functions as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: The hot water plate, the first heat storage plate, the second heat storage plate and the cold water plate are respectively formed by stamping stainless steel plates; The hot water plate, the first heat storage plate, the second heat storage plate, the cold water plate, the second heat storage plate, the first heat storage plate, and the hot water plate are stacked and welded in sequence, and the folded edge of one plate is welded and fixed to the back edge of another plate during welding; Channel baffles are added to the outside of the hot and cold channels and the phase change material channels, and are welded to form inlet and outlet channels for high-temperature medium, low-temperature medium and phase change material. Both ends of the heat exchanger body are closed by sealing plates.

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