Low-temperature heat supply reactor system

Abstract

The invention provides a low-temperature heat supply reactor system which comprises a low-temperature heat supply reactor module which comprises three loops used for supplying steam to a user side; the multi-stage phase change heat storage module comprises a plurality of multi-stage phase change heat storage heat exchangers, and each multi-stage phase change heat storage heat exchanger comprises an outer wall, a phase change heat storage heat exchange assembly arranged in the outer wall and a phase change material filling layer filled between the phase change heat storage heat exchange assembly and the outer wall. A low-temperature working medium flow channel and a steam flow channel are formed in the phase change heat storage and exchange assembly, and the steam flow channel is connected with the end, close to the user side, of the third loop through a pipeline. According to the low-temperature heat supply reactor system, every two of seawater, extracted steam and a phase change material exchange heat with each other, redundant and any amount of high-temperature steam is discharged into the multi-stage phase change heat storage module to be stored, so that flexible peak regulation of the low-temperature heat supply reactor system is realized, and the stored heat can be used for heating the seawater entering the seawater desalination device; and the temperature of seawater entering the seawater desalination device can be controlled, so that the seawater desalination device operates stably and efficiently.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power low-temperature heating reactors, and in particular relates to a low-temperature heating reactor system. Background Art

[0002] The low-temperature heating reactor is a reactor that specializes in providing heat energy. It is mainly used in urban area heating, industrial thermal energy heating, etc. Compared with traditional nuclear power plants, the low-temperature heating reactor has lower working pressure and higher safety. Since it directly provides heat energy without going through the power generation process, the low-temperature heating reactor has higher energy utilization efficiency and is more economical. With the continuous advancement of technology, the low-temperature heating reactor has shown broad application prospects and development potential in providing clean and reliable heat energy. The demand for heat supply often changes with the seasons and time periods, so the low-temperature heating reactor is required to have a certain load adjustment capability and be able to flexibly respond to heating demand.

[0003] Seawater desalination technology is often combined with low-temperature heating reactor peak load regulation. During the electrodialysis process, the electric field causes the salt ions in the water to migrate through the selective ion exchange membrane, thereby achieving desalination. The heat energy generated by the low-temperature heating reactor can not only increase the inlet water temperature, improve the ion migration rate and electrodialysis efficiency, but also reduce membrane pollution and fouling, and extend the service life of the membrane. This innovative solution is expected to become an important means to solve the global water shortage problem. However, the residual steam heat of the low-temperature heating reactor is directly used to heat the feed water of the seawater desalination device through heat exchange equipment. Then the stable fresh water output of the seawater desalination is heavily dependent on the stable operation of the low-temperature heating reactor and the load stability of the heating user end. However, the seasonal changes in the user end load are objective, so it is necessary to seek other ways to ensure the stable fresh water supply of the seawater desalination device. Summary of the invention

[0004] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a low-temperature heating reactor system to achieve flexible load regulation of the low-temperature heating reactor and to enable heat to be continuously and stably supplied to the water supply of the seawater desalination device to achieve a stable fresh water supply.

[0005] To achieve the above-mentioned object and other related objects, the present invention provides a low-temperature heating reactor system, comprising:

[0006] A low-temperature heating reactor module, the low-temperature heating reactor module comprising a coolant circulation loop integrated in the containment, an intermediate loop connecting the core heat generation system in the containment with the steam supply system, and a tertiary loop for supplying steam to the user end;

[0007] A multi-stage phase-change heat storage module, the multi-stage phase-change heat storage module includes multiple multi-stage phase-change heat storage heat exchangers, the multi-stage phase-change heat storage heat exchanger includes an outer wall, a phase-change heat storage heat exchange component arranged in the outer wall, and a phase-change material filling layer filled between the phase-change heat storage heat exchange component and the outer wall, the phase-change heat storage heat exchange component and the phase-change material filling layer are used to absorb and store heat from the high-temperature steam of the three circuits, a low-temperature working fluid flow channel and a steam flow channel are formed in the phase-change heat storage heat exchange component, and the steam flow channel is connected to one end of the three circuits close to the user end through a pipeline.

[0008] In one embodiment of the present invention, the phase change heat storage and heat exchange component includes multiple groups of phase change material fillings, each group is surrounded by a first heat exchange plate to form a flow channel surrounding the phase change material filling, and a second heat exchange plate is arranged between two adjacent phase change material fillings in each group to separate the flow channel into the low-temperature working fluid flow channel and the steam flow channel.

[0009] In one embodiment of the present invention, along the cross section of the multi-stage phase-change heat storage heat exchanger, the plurality of phase-change material filling pieces, the low-temperature working medium flow channels and the steam flow channels are arranged in a honeycomb shape.

[0010] In one embodiment of the present invention, the first heat exchange plates disposed around the periphery of each group are of a wavy structure.

[0011] In one embodiment of the present invention, the low-temperature working medium flow channels and the steam flow channels in two adjacent groups are arranged adjacent to each other.

[0012] In one embodiment of the present invention, the flow directions of the flowing medium in the low-temperature working medium flow channel and the flowing medium in the steam flow channel are opposite.

[0013] In one embodiment of the present invention, a buffer layer and a heat-insulating layer are sequentially arranged between the outer wall and the phase change material filling layer from the inside to the outside.

[0014] In one embodiment of the present invention, a plurality of the multi-stage phase-change heat storage heat exchangers are connected in parallel.

[0015] In one embodiment of the present invention, a seawater desalination device is further included, which is connected to the outlet of the low-temperature working fluid flow channel of the phase change heat storage heat exchanger through a pipeline, and the inlet of the low-temperature working fluid flow channel is used to inject low-temperature seawater into the low-temperature working fluid flow channel.

[0016] In one embodiment of the present invention, an inlet seawater temperature control system is also included, which includes:

[0017] A regulating valve, the regulating valve being arranged at the inlet of the cryogenic working medium flow channel;

[0018] A temperature sensor, which is disposed at the inlet of the seawater desalination device and is used to obtain the temperature value of seawater entering the seawater desalination device;

[0019] A controller is electrically connected to the regulating valve and the temperature sensor, and the controller controls the valve opening of the regulating valve according to the seawater temperature value at the inlet of the seawater desalination device.

[0020] In one embodiment of the present invention, a temperature setting value is stored in the controller, and the controller controls the valve opening of the regulating valve according to the temperature setting value and the seawater temperature at the inlet of the seawater desalination device to adjust the seawater flow entering the multi-stage phase change heat storage module, thereby adjusting the seawater temperature entering the seawater desalination device.

[0021] In one embodiment of the present invention, the regulating valve is provided at the inlet of the low-temperature working medium flow channel in each of the multi-stage phase-change heat storage heat exchangers.

[0022] In one embodiment of the present invention, the phase change material filling piece, the low-temperature working medium in the low-temperature working medium flow channel, and the high-temperature steam in the steam flow channel exchange heat with each other in pairs.

[0023] The present invention proposes a low-temperature heating reactor system. By designing a multi-stage phase change heat storage module, multiple parallel multi-stage phase change heat storage heat exchangers in the multi-stage phase change heat storage module adopt a bionic design, have a large heat exchange area and high heat exchange efficiency, and its unique flow channel design can realize the mutual heat exchange of seawater, extraction steam and phase change materials. Excess and any amount of high-temperature steam is discharged into the multi-stage phase change heat storage module and stored, so as to realize flexible peak regulation of the low-temperature heating reactor system.

[0024] The present invention proposes a low-temperature heating stack system, which stores the heat of high-temperature steam through a multi-stage phase-change heat storage heat exchanger and uses it to heat the inlet seawater of an electrodialysis seawater desalination device to improve the efficiency of seawater desalination. The seawater temperature control system controls the temperature of the heated seawater by adjusting the flow entering the multi-stage phase-change heat storage module, controls the temperature of the inlet seawater of the seawater desalination device, and enables the seawater desalination device to operate stably and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 Schematic diagram of a low temperature heating reactor system in one embodiment of the present invention.

[0027] Figure 2 The figure is a structural diagram of a multi-stage phase-change heat storage heat exchanger in one embodiment of the present invention.

[0028] Figure 3 It is a cross-sectional view of a multi-stage phase-change heat storage heat exchanger in one embodiment of the present invention.

[0029] Figure 4 It is a partial cross-sectional view between the phase-change heat storage and heat exchange component and the outer wall in one embodiment of the present invention.

[0030] Figure 5 The figure is a schematic diagram of an inlet seawater temperature control module of a seawater desalination device in one embodiment of the present invention.

[0031] Figure 6 FIG. 4 is a diagram showing calculation results in one embodiment of the present invention.

[0032] Description of labels:

[0033] 1. Reactor core; 2. Main heat exchanger; 3. Intermediate loop circulation pump; 4. Steam generator; 5. Deaerator; 6. Feed water pump; 7. User end; 8. Intermediate loop; 9. Tertiary loop; 10. Make-up water; 11. High-temperature steam; 12. Extracted steam; 13. Multi-stage phase-change heat storage heat exchanger; 14. Water desalination device; 15. Exhaust steam; 16. Seawater; 17. High-temperature seawater; 18. Fresh water; 19. Phase change material filling piece; 20. Phase change material filling layer; 21. Buffer layer; 22. Insulation layer; 23. Outer wall; 25. Low-temperature working medium flow channel; 24. Steam flow channel; 201. First heat exchange plate; 202. Second heat exchange plate. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0035] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0036] See also Figures 1 to 6As shown, the present invention proposes a low-temperature heating stack system, so as to realize the extraction of excess high-temperature steam generated by the low-temperature heating stack system and send it into a multi-stage phase change heat storage module for cascade heat storage, and transfer the heat to the phase change material filling layer to realize the flexible load adjustment of the low-temperature heating stack, and at the same time, the cascade utilization of the remaining high-temperature steam of the low-temperature heating stack can be realized, reducing the waste of heat, and using the heat stored in the phase change material to heat the seawater at the inlet of the electrodialysis seawater desalination device, and at the same time, the seawater temperature control system controls the temperature of the seawater when it enters the electrodialysis device by adjusting the seawater flow rate, so as to improve the seawater desalination efficiency. Specifically, the low-temperature heating stack system includes a low-temperature heating stack module, a multi-stage phase change heat storage module and a seawater desalination device, the low-temperature heating stack module is used to supply heat to the user end, the multi-stage phase change heat storage module is used to extract the excess high-temperature steam generated by the low-temperature heating stack module for storage, the seawater desalination device is used to use the heat stored in the multi-stage phase change heat storage module to heat the seawater at the inlet of the seawater desalination device, and desalinate the heated seawater.

[0037] See also Figure 1 As shown, in this embodiment, the low-temperature heating reactor module includes a core 1, a main heat exchanger 2, an intermediate loop circulation pump 3, a steam generator 4, a deaerator 5, a feed water pump 6, a user end 7, an intermediate loop 8, a tertiary loop 9, a water makeup 10, a high-temperature steam 11, and a steam extraction 12, wherein the core 1 is the core component of the low-temperature heating reactor, the coolant system of the primary loop in the containment takes away heat from the core 1 and sends it to the main heat exchanger 2, the main heat exchanger 2 serves as a hub connecting the primary loop and the intermediate loop 8, and transfers the heat of the primary loop to the intermediate loop 8, and the intermediate loop circulation pump 3 drives the working fluid in the intermediate loop 8 to circulate, and transfers the heat to the tertiary loop 9; The steam generator 4 is the heat transfer hub of the intermediate loop 8 and the tertiary loop 9, and the function of the deaerator 5 is deoxidation and mixed heat exchange; the makeup water 10 in the tertiary loop 9 and part of the high-temperature steam enter the deaerator 5 together to become saturated water, and the water supply pump 6 drives the saturated water into the steam generator 4 to absorb heat and become high-temperature steam 11. The high-temperature steam 11 is mainly supplied to the user end 7, and the excess extraction steam 12 (high-temperature steam) is discharged to achieve peak regulation; the intermediate loop 8 plays a role of safety isolation between the primary loop reactor system and the steam and water supply system, preventing the radioactive substances in the primary loop from directly contacting the steam supply loop, thereby ensuring the safety of high-temperature steam supply.

[0038] See also Figures 1 to 4As shown, in this embodiment, the multi-stage phase change heat storage module includes a plurality of multi-stage phase change heat storage heat exchangers 13, the multi-stage phase change heat storage heat exchanger 13 includes an outer wall 23, a phase change heat storage heat exchange component arranged in the outer wall 23, and a phase change material filling layer 20 filled between the phase change heat storage heat exchange component and the outer wall 23, the phase change heat storage heat exchange component and the phase change material filling layer 20 are used to absorb and store heat from the high-temperature steam of the three circuits 9, and a low-temperature working fluid flow channel 25 and a steam flow channel 24 are formed in the phase change heat storage heat exchange component, and the steam flow channel 24 is connected to one end of the three circuits 9 close to the user end 7 through a pipeline.

[0039] See also Figures 1 to 4As shown, in this embodiment, the phase change heat storage and heat exchange component includes a plurality of groups of phase change material filling members 19, each group is surrounded by a first heat exchange plate 201 to form a flow channel surrounding the phase change material filling member 19, and a second heat exchange plate 202 is arranged between two adjacent phase change material filling members 19 in each group to separate the flow channel into the low-temperature working fluid flow channel 25 and the steam flow channel 24. It can be understood that along the cross-section of the multi-stage phase change heat storage heat exchanger 13, the multiple phase change material fillers 19, the low-temperature working fluid flow channel 25 and the steam flow channel 24 are arranged in a honeycomb shape. For example, the phase change material fillers 19 in the multi-stage phase change heat storage heat exchanger 13 are arranged in a honeycomb structure, and the multiple phase change material fillers 19 are arranged in a honeycomb shape, with each row of phase change material fillers 19 as a group, and a first heat exchange plate 201 is arranged around the outside of each row, and a second heat exchange plate 202 is arranged between two adjacent phase change material fillers 19, wherein the contour line of the first heat exchange plate 201 also has a honeycomb structure, that is, the multi-stage phase change heat storage heat exchanger 13 adopts a honeycomb bionic flow channel design, which has a large heat exchange area and high heat exchange efficiency, and its unique flow channel design can realize the mutual heat exchange between seawater, supply steam and phase change material. Of course, in some other embodiments, the first heat exchange plate 201 arranged around the periphery of each group can be set to a wavy structure or other shapes. Of course, the phase change material filler 19 can also be set to a polygonal column structure or other structures to increase the contact surface area between the phase change material filler 19, the low-temperature working medium in the low-temperature working medium flow channel 25, and the extraction steam 12 in the steam flow channel 24, so that the multi-stage phase change heat storage heat exchanger 13 has a larger heat exchange area and higher heat exchange efficiency. It can be understood that the phase change material filler 19 is made of phase change material, and the above-mentioned flow channel is also made by heat exchange plates. In the cross-sectional direction, a plurality of filling holes are distributed in the flow channel in a honeycomb shape, and the phase change material is filled in the filling holes. It can also be understood that the outer surface of the phase change material filler 19 is also wrapped with a heat exchange plate to improve the heat exchange efficiency and effect between the low-temperature working medium and the phase change material filler 19 and between the extraction steam 12 and the phase change material filler 19.

[0040] See also Figures 1 to 4As shown, in this embodiment, the low-temperature working medium flow channel 25 and the steam flow channel 24 in two adjacent groups are arranged adjacently, for example, a plurality of phase change material fillers 19 arranged in a honeycomb shape in three rows are used as an example, wherein the plurality of phase change material fillers 19 in each row are respectively a group, namely the first group, the second group and the third group, the second group is the middle row, the flow channel of the first group away from the second group is the low-temperature working medium flow channel 25, the flow channel close to the second group is the steam flow channel 24, the flow channel of the second group close to the first group is the low-temperature working medium flow channel 25, the flow channel close to the third group is the steam flow channel 24, the flow channel of the third group close to the first group is the low-temperature working medium flow channel 25, and the flow channel away from the second group is the steam flow channel 24, so as to increase the heat exchange area between the low-temperature working medium and the high-temperature steam and improve the heat exchange efficiency. It can be understood that the first heat exchange plate 201 between the two adjacent groups is a common heat exchange plate for the two groups, that is, only one first heat exchange plate 201 is required between the two adjacent groups. It should be noted that the flow directions of the flowing media in the low-temperature working medium flow channel 25 and the steam flow channel 24 are opposite, that is, the seawater 16 and the extracted steam 12 are arranged in countercurrent to improve the heat exchange efficiency and effect.

[0041] See also Figures 1 to 4 As shown, the extracted steam 12 discharged from the low-temperature heating stack module flows through the pipeline into the steam flow channel 24, and contacts the phase change heat storage component 19 in the steam flow channel 24, so that a part of the heat of the extracted steam 12 is absorbed and stored by the phase change heat storage material in the phase change material filling member 19 and the phase change material filling layer 20, that is, the multi-stage phase change heat storage heat exchanger 13 can store the heat of the remaining high-temperature steam in the low-temperature heating stack system to realize flexible load regulation of the low-temperature heating stack.

[0042] See also Figures 1 to 4 As shown, in this embodiment, there is a low-temperature working medium in the low-temperature working medium flow channel 25. Specifically, in this embodiment, in the multi-stage phase-change heat storage heat exchanger 13, the phase-change material filling member 19, the low-temperature working medium in the low-temperature working medium flow channel 25, and the extraction steam 12 in the steam flow channel 24 exchange heat with each other in pairs, and are also in contact with the phase-change material filling layer 20, so that part of the heat of the extraction steam 12 is absorbed and stored by the phase-change heat storage material in the phase-change material filling member 19 and the phase-change material filling layer 20, and part of it is transferred to the low-temperature working medium in the multi-stage phase-change heat storage heat exchanger. Of course, it is understandable that if there is no low-temperature working fluid flowing in the multi-stage phase change heat storage heat exchanger 13, the heat of the extraction steam 12 can be absorbed by the phase change heat storage material alone. The extraction steam 12 is converted into exhaust steam 15 after heat exchange in the multi-stage phase change heat storage heat exchanger 13 and discharged. Then, when the low-temperature working fluid enters the low-temperature working fluid flow channel 25 of the multi-stage phase change heat storage heat exchanger 13, it can absorb heat and be heated.

[0043] See also Figures 1 to 4As shown, in this embodiment, a buffer layer 21 and a thermal insulation layer 22 are sequentially arranged between the outer wall 23 and the phase change material filling layer from the inside to the outside. The thermal insulation layer 22 is used to reduce heat loss to the outside and improve the step-by-step utilization rate of heat. The buffer layer 21 is used to offset the extrusion caused by the phase change of the phase change material filling layer 20. The phase change material filling layer 20 is filled with phase change material, and heat is stored by phase change. In the multi-stage phase change heat storage module, the extracted steam 12 is stepped through the phase change material filling layer 20 to store the heat of the extracted steam in the phase change material filling layer 20. The excess high-temperature steam generated by the low-temperature heating stack system is extracted and sent to the multi-stage phase change heat storage module for step-by-step heat storage, and the heat is transferred to the phase change material filling layer 20 to realize the step-by-step utilization of the remaining high-temperature steam of the low-temperature heating stack and reduce the waste of heat. The excess and arbitrary amount of high-temperature steam is discharged into the multi-stage phase change heat storage module for storage to realize flexible peak regulation of the low-temperature heating stack system.

[0044] See also Figures 1 to 4 As shown, in this embodiment, the plurality of the multi-stage phase change heat storage heat exchangers 13 in the phase change heat storage module are connected in parallel, and the inlet of the low-temperature working fluid flow channel 25 in each of the multi-stage phase change heat storage heat exchangers 13 is provided with the regulating valve, and the flow rate of the low-temperature working fluid (such as seawater) entering the multi-stage phase change heat storage heat exchanger 13 can be controlled by the regulating valve.

[0045] See also Figures 1 to 4 As shown, in this embodiment, the low-temperature heating stack system also includes a seawater desalination device 14, which is connected to the outlet of the low-temperature working fluid flow channel 25 through a pipeline, and the inlet of the low-temperature working fluid flow channel 25 is used to inject low-temperature seawater 16 into the low-temperature working fluid flow channel 25. The treated seawater 16 enters the low-temperature working fluid flow channel 25 of the multi-stage phase change heat storage heat exchanger 13, and the low-temperature working fluid is heated in the flow channel 25. The heated high-temperature seawater 17 enters the seawater desalination device 14 for desalination treatment, which can effectively improve the seawater desalination efficiency and obtain more fresh water 18 that meets the requirements at the same voltage. In this embodiment, the seawater desalination device 14 is an electrodialysis seawater desalination device. The multi-stage phase change heat storage module can be adjusted in real time according to the production capacity of the low-temperature heating reactor to achieve peak control of the low-temperature heating reactor system. The seawater in the multi-stage phase change heat storage heat exchanger 13 can be heated by the heat exchange medium (extracted steam 12) and the phase change material filling layer 20 at the same time, or it can be heated in a step-by-step manner only through the exothermic reaction accompanied by the solidification of the phase change material filling layer 20.

[0046] See also Figures 1 to 6As shown, in this embodiment, the low-temperature heating reactor system also includes an inlet seawater temperature control system, which includes a regulating valve 101, a temperature sensor 102 and a controller 103. The regulating valve 101 is arranged at the inlet of the low-temperature working medium flow channel 25; the temperature sensor 102 is arranged at the inlet of the seawater desalination device 14, and is used to obtain the temperature value of the seawater entering the seawater desalination device 14; the controller 103 is electrically connected to the regulating valve 101 and the temperature sensor 102, and the controller 103 controls the valve of the regulating valve 101 according to the inlet seawater temperature value of the seawater desalination device. The controller 103 stores a temperature setting value. The controller 103 controls the valve opening of the regulating valve 101 according to the temperature setting value and the seawater temperature value at the inlet of the seawater desalination device to adjust the seawater flow rate entering the multi-stage phase change heat storage module, thereby adjusting the seawater temperature entering the seawater desalination device 14. For example, by obtaining the deviation between the seawater outlet temperature in the multi-stage phase change heat storage module and its setting value, after calculation by the PID controller, the valve opening is adjusted to control the seawater flow rate entering the heat exchanger, so that the seawater temperature entering the seawater desalination device 14 is regulated to the setting value. In one embodiment, the seawater temperature is increased from 25°C to 36.64°C, and the desalination rate is increased from 0.25 to 0.404, indicating that the multi-stage phase change heat storage heat exchanger 13 has a good heat exchange effect, and the desalination efficiency of the electrodialysis seawater desalination device is significantly improved after the inlet seawater is heated up. It can be understood that in the present application, the surplus high-temperature steam generated by the low-temperature heating pile is efficiently utilized and stored through the multi-stage phase change heat storage heat exchanger 13, and a bionic heat exchange flow channel is designed to improve the step-by-step utilization rate of the heat of the low-temperature heating pile. The multi-stage phase change heat storage heat exchanger 13 provides heat to the inlet seawater of the seawater desalination device 14, and adjusts the inlet seawater flow of the seawater desalination device 14 through the seawater temperature control module, thereby realizing temperature control of the inlet seawater and improving the desalination efficiency of electrodialysis seawater desalination.

[0047] The present invention proposes a low-temperature heating reactor system. By designing a multi-stage phase change heat storage module, multiple parallel multi-stage phase change heat storage heat exchangers in the multi-stage phase change heat storage module adopt a bionic design, have a large heat exchange area and high heat exchange efficiency, and its unique flow channel design can realize the mutual heat exchange of seawater, extraction steam and phase change materials. Excess and any amount of high-temperature steam is discharged into the multi-stage phase change heat storage module and stored, so as to realize flexible peak regulation of the low-temperature heating reactor system.

[0048] The present invention proposes a low-temperature heating stack system, which stores the heat of high-temperature steam through a multi-stage phase-change heat storage heat exchanger and uses it to heat the inlet seawater of an electrodialysis seawater desalination device to improve the efficiency of seawater desalination. The seawater temperature control system controls the temperature of the heated seawater by adjusting the flow entering the multi-stage phase-change heat storage module, controls the temperature of the inlet seawater of the seawater desalination device, and enables the seawater desalination device to operate stably and efficiently.

[0049] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

[0050] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.

Claims

1. A low temperature heating reactor system, characterized in that: include: A low-temperature heating reactor module, the low-temperature heating reactor module comprising a coolant circulation loop integrated in the containment, an intermediate loop connecting the core heat generation system in the containment with the steam supply system, and a tertiary loop for supplying steam to the user end; A multi-stage phase-change heat storage module, the multi-stage phase-change heat storage module includes multiple multi-stage phase-change heat storage heat exchangers, the multi-stage phase-change heat storage heat exchanger includes an outer wall, a phase-change heat storage heat exchange component arranged in the outer wall, and a phase-change material filling layer filled between the phase-change heat storage heat exchange component and the outer wall, the phase-change heat storage heat exchange component and the phase-change material filling layer are used to absorb and store heat from the high-temperature steam of the three circuits, a low-temperature working fluid flow channel and a steam flow channel are formed in the phase-change heat storage heat exchange component, and the steam flow channel is connected to one end of the three circuits close to the user end through a pipeline.

2. The low temperature heating reactor system according to claim 1, characterized in that: The phase change heat storage and heat exchange component includes multiple groups of phase change material fillings, each group is surrounded by a first heat exchange plate to form a flow channel surrounding the phase change material fillings, and a second heat exchange plate is arranged between two adjacent phase change material fillings in each group to separate the flow channel into the low-temperature working fluid flow channel and the steam flow channel.

3. The low temperature heating reactor system according to claim 2, characterized in that: Along the cross section of the multi-stage phase-change heat storage heat exchanger, the plurality of phase-change material filling pieces, the low-temperature working medium flow channels and the steam flow channels are arranged in a honeycomb shape.

4. The low temperature heating reactor system according to claim 2, characterized in that: The first heat exchange plates arranged around the periphery of each group are of a wavy structure.

5. The low temperature heating reactor system according to claim 2, characterized in that: The low-temperature working medium flow channels and steam flow channels in two adjacent groups are arranged adjacent to each other.

6. The low temperature heating reactor system according to claim 1, characterized in that: The flow directions of the flowing medium in the low-temperature working medium flow channel and the flowing medium in the steam flow channel are opposite.

7. The low temperature heating reactor system according to claim 1, characterized in that: A buffer layer and a heat preservation layer are sequentially arranged between the outer wall and the phase change material filling layer from the inside to the outside.

8. The low temperature heating reactor system according to claim 1, characterized in that: A plurality of the multi-stage phase-change heat storage heat exchangers are connected in parallel.

9. The low temperature heating reactor system according to claim 1, characterized in that: It also includes a seawater desalination device, which is connected to the outlet of the low-temperature working fluid flow channel of the phase-change heat storage heat exchanger through a pipeline, and the inlet of the low-temperature working fluid flow channel is used to inject low-temperature seawater into the low-temperature working fluid flow channel.

10. The low temperature heating reactor system according to claim 9, characterized in that: Also included is an inlet seawater temperature control system comprising: A regulating valve, the regulating valve being arranged at the inlet of the cryogenic working medium flow channel; A temperature sensor, which is disposed at the inlet of the seawater desalination device and is used to obtain the temperature value of seawater entering the seawater desalination device; A controller is electrically connected to the regulating valve and the temperature sensor, and the controller controls the valve opening of the regulating valve according to the seawater temperature value at the inlet of the seawater desalination device.

11. The low temperature heating reactor system according to claim 10, characterized in that: The controller stores a temperature setting value, and the controller controls the valve opening of the regulating valve according to the temperature setting value and the seawater temperature at the inlet of the seawater desalination device to adjust the seawater flow entering the multi-stage phase change heat storage module, thereby adjusting the seawater temperature entering the seawater desalination device.

12. The low temperature heating reactor system according to claim 10, characterized in that: The regulating valve is provided at the inlet of the low-temperature working medium flow channel in each of the multi-stage phase-change heat storage heat exchangers.

13. The low temperature heating reactor system according to claim 1, characterized in that: The phase change material filling piece, the low-temperature working medium in the low-temperature working medium flow channel, and the high-temperature steam in the steam flow channel exchange heat with each other in pairs.

Images