Large-scale solid heat storage system and control method

Abstract

The invention discloses a large-scale solid heat storage system and a control method, the system comprises a plurality of heat storage subareas, the heat storage subareas are arranged in parallel, inlets of the heat storage subareas are jointly connected with a main heat storage pipeline, and outlets of the heat storage subareas are jointly connected with a main heat release pipeline; each heat storage subarea comprises a plurality of heat storage pipe sections, the inlet pipe section of each heat storage pipe section is provided with a pipe section inlet valve, the outlet pipe section of each heat storage pipe section is provided with a pipe section outlet valve, the heat storage pipe sections are arranged in parallel, and each heat storage pipe section comprises a plurality of solid heat storage modules; the multiple solid heat storage modules are arranged between the pipe section inlet valve and the pipe section outlet valve in series, the inlet pipe section and the outlet pipe section of each heat storage pipe section are each provided with a temperature sensor, the temperature sensors are connected with a temperature flow feedback control unit, and the temperature flow feedback control units are connected with the pipe section inlet valves.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage, and in particular relates to a large-scale solid heat storage system and a control method. Background Art

[0002] Solid heat storage technology has the advantages of high heat storage temperature, high energy storage density, and various forms of external heat output. It can provide hot air, high-temperature steam and hot water, and can meet the heat demand of multiple industrial and civil fields. Therefore, solid heat storage systems are widely used in solar thermal power generation, industrial waste heat utilization and other fields. Due to the limitations of solid heat storage materials themselves, the temperature of large-scale solid heat storage bodies will rise and fall during the heat storage and heat release process. The use of simple quantitative stacking will make the solid heat storage system lack flexible operating conditions. It is difficult to balance the heat storage and heat release stages during system operation, resulting in uneven or too fast heat release, which cannot meet the needs of long-term stable heat release.

[0003] The current parallel or series connection methods are relatively fixed and fail to effectively cope with the different requirements of the system during heat storage and heat release. Therefore, a flexible and efficient design and control method is urgently needed to meet the different requirements of large-scale solid heat storage systems and optimize the overall performance of the system. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem of low efficiency of the series-parallel mode of large-scale solid heat storage systems, and propose a large-scale solid heat storage system and a control method.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme: In a first aspect, the present invention provides a large-scale solid heat storage system, comprising a plurality of heat storage partitions, wherein the plurality of heat storage partitions are arranged in parallel, the inlet of each heat storage partition is commonly connected to a main heat storage pipeline, and the outlet of each heat storage partition is commonly connected to a main heat release pipeline; Each heat storage partition includes a plurality of heat storage pipe segments, the inlet pipe segment of each heat storage pipe segment is provided with a pipe segment inlet valve, the outlet pipe segment of each heat storage pipe segment is provided with a pipe segment outlet valve, the plurality of heat storage pipe segments are arranged in parallel, the heat storage pipe segment includes a plurality of solid heat storage modules, the plurality of solid heat storage modules are arranged in series between the pipe segment inlet valve and the pipe segment outlet valve, the inlet pipe segment and the outlet pipe segment of each heat storage pipe segment are provided with a temperature sensor, the temperature sensor is connected to a temperature flow feedback control unit, and the temperature flow feedback control unit is connected to the pipe segment inlet valve.

[0006] Furthermore, a partition inlet pipe section is connected between the inlet of each heat storage partition and the main heat storage pipeline, and a partition outlet pipe section is connected between the outlet of each heat storage partition and the main heat release pipeline.

[0007] Furthermore, a partition inlet valve is provided on the partition inlet pipe section, and a partition outlet valve is provided on the partition outlet pipe section.

[0008] Furthermore, an inlet main valve is installed between each partition inlet valve and the main heat storage pipeline, and an outlet main valve is installed between each partition outlet valve and the main heat release pipeline.

[0009] In a second aspect, the present invention provides a control method for a large-scale solid heat storage system, using the large-scale solid heat storage system, comprising the following steps: Calculate the number and partitioning of solid heat storage modules according to the total heat storage demand, heat storage flow and heat release flow of the solid heat storage system; In each heat storage partition, the solid heat storage modules are arranged in series and parallel, and the temperature of each heat storage pipe section is monitored, and the operating status of each heat storage pipe section is determined according to the temperature change; In the heat storage stage, all parallel heat storage pipe sections store heat at the same time. When the outlet temperature of any heat storage pipe section reaches or exceeds the preset cut-off temperature, the pipe section inlet valve of the heat storage pipe section whose outlet temperature reaches or exceeds the preset cut-off temperature is closed, and the remaining heat storage pipe sections continue to operate; During the heat release stage, the solid heat storage system monitors the outlet temperature of the heat storage pipe section through a temperature sensor. Under the condition that the total flow rate remains unchanged, the heat storage pipe sections are opened and closed in turn to release heat evenly and extend the heat release time.

[0010] Furthermore, the solid heat storage system selects some heat storage partitions to operate simultaneously according to the total flow demand and actual load conditions.

[0011] Furthermore, the heat storage pipe section control method of a heat storage partition in the heat release stage comprises the following steps: The outlet valve of the first heat storage pipe section is opened for operation. When the outlet temperature of the first heat storage pipe section is lower than the cut-off temperature, the outlet valve of the second heat storage pipe section is opened to reduce the flow rate. When the average temperature of the outlet temperatures of the first heat storage pipe segment and the second heat storage pipe segment is lower than the cut-off temperature, the outlet valve of the third heat storage pipe segment is opened, and the flow rate is reduced again; Open the pipe outlet valves of all heat storage pipe sections in sequence. When the average pipe outlet temperature of all heat storage pipe sections is lower than the cut-off temperature, close the pipe outlet valve of the firstly opened heat storage pipe section, increase the flow rate, and then close the pipe outlet valves of the heat storage pipe sections in sequence according to the sequence of the pipe outlet valves of the opened heat storage pipe sections, until the pipe outlet temperature of the final heat storage pipe section is lower than the cut-off temperature, and the heat release ends.

[0012] Furthermore, the flow rate of the first heat storage pipe segment and the second heat storage pipe segment operating simultaneously is half of the flow rate of the first heat storage pipe segment operating alone; the flow rate of the first heat storage pipe segment, the second heat storage pipe segment and the third heat storage pipe segment operating together is one third of the flow rate of the first heat storage pipe segment operating alone, and so on, the flow rate of several heat storage pipe segments operating together is a several part of the flow rate of the first heat storage pipe segment operating alone.

[0013] Furthermore, the heat storage pipe segment control method in a heat storage partition in the heat storage stage includes the following steps: the pipe segment inlet valves of all heat storage pipe segments are opened, and all heat storage pipe segments are operated simultaneously; when the average pipe segment outlet temperature of all heat storage pipe segments is higher than the cut-off temperature, the pipe segment inlet valve of the heat storage pipe segment with the highest pipe segment outlet temperature is closed, and the flow rate of the remaining heat storage pipe segments is increased; thereafter, the pipe segment inlet valves of the heat storage pipe segments are closed in sequence according to the outlet temperature of the heat storage pipe segments, until finally all pipe segment outlet temperatures are higher than the cut-off temperature, and heat storage is completed.

[0014] Furthermore, the pipe segment inlet valves of all heat storage pipe segments are opened, and the flow rate of each heat storage pipe segment is one-tenth, where the number is the number of heat storage pipe segments with the pipe segment inlet valves opened.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention proposes a large-scale solid heat storage system, which is simple and flexible, suitable for large-scale heat storage systems, and can quickly design the heat storage system according to demand and optimize the operation mode of the solid heat storage module in the heat storage and heat release stages. The present invention realizes the reasonable configuration of the total number of heat storage units and the number of partitions, and can flexibly adjust the operation mode of each partition and pipe section according to actual needs. Since the partitions are in parallel structure, the system can flexibly enable or disable some partitions according to different heat storage and heat release requirements without affecting the operation efficiency of the overall system.

[0016] Furthermore, the scalability of the system is also fully considered. When the heat storage or flow demand increases, the heat storage capacity of the system can be expanded by adding partitions or parallel pipe sections without making major modifications to the existing system structure.

[0017] The control method of a large-scale solid heat storage system of the present invention realizes intelligent control in the heat storage process by synchronously opening and sequentially closing parallel pipe sections, so that each pipe section is closed in time after reaching the cut-off temperature to avoid overheating and maximize the efficiency of the heat storage system. Intelligent heat release process control is achieved by gradually opening and closing parallel pipe sections. This dynamic adjustment method enables the system to accurately adjust the flow rate according to demand while keeping the total flow unchanged, ensuring uniform heat release. Compared with traditional methods, the present invention significantly prolongs the heat release time and improves the efficiency of thermal energy utilization. The operating status of each module is dynamically adjusted by temperature and flow changes to achieve the optimal utilization rate of the heat storage unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings: Figure 1 The figure is a simplified diagram of the heat storage partition structure of a large-scale solid heat storage system.

[0019] Figure 2 The figure is a simplified structural diagram of a solid heat storage module with a large-scale solid heat storage system.

[0020] Among them, 1 is the heat storage partition and 2 is the solid heat storage module. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0022] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] Embodiment 1 See also Figure 1 and Figure 2 A large-scale solid heat storage system comprises a plurality of heat storage partitions 1, wherein the plurality of heat storage partitions 1 are arranged in parallel, the inlet of each heat storage partition 1 is commonly connected to a main heat storage pipeline, and the outlet of each heat storage partition 1 is commonly connected to a main heat release pipeline; Each heat storage partition 1 includes a plurality of heat storage pipe segments, the inlet pipe segment of each heat storage pipe segment is provided with a pipe segment inlet valve, the outlet pipe segment of each heat storage pipe segment is provided with a pipe segment outlet valve, the plurality of heat storage pipe segments are arranged in parallel, the heat storage pipe segment includes a plurality of solid heat storage modules 2, the plurality of solid heat storage modules 2 are arranged in series between the pipe segment inlet valve and the pipe segment outlet valve, the inlet pipe segment and the outlet pipe segment of each heat storage pipe segment are provided with a temperature sensor, the temperature sensor is connected to a temperature flow feedback control unit, and the temperature flow feedback control unit is connected to the pipe segment inlet valve.

[0026] The inlet of each heat storage partition 1 is connected to the main heat storage pipeline by a partition inlet pipe section, and the outlet of each heat storage partition 1 is connected to the main heat release pipeline by a partition outlet pipe section. The partition inlet pipe section is provided with a partition inlet valve, and the partition outlet pipe section is provided with a partition outlet valve. An inlet main valve is installed between each partition inlet valve and the main heat storage pipeline, and an outlet main valve is installed between each partition outlet valve and the main heat release pipeline.

[0027] Embodiment 2 A control method for a large-scale solid heat storage system, using the large-scale solid heat storage system described in Example 1, comprises the following steps: Calculate the number and partitions of the solid heat storage modules 2 according to the total heat storage demand, heat storage flow and heat release flow of the solid heat storage system; In each heat storage partition 1, the solid heat storage modules 2 are arranged in series and parallel, and the temperature of each heat storage pipe section is monitored, and the operating status of each heat storage pipe section is determined according to the temperature change; In the heat storage stage, all parallel heat storage pipe sections store heat at the same time. When the outlet temperature of any heat storage pipe section reaches or exceeds the preset cut-off temperature, the pipe section inlet valve of the heat storage pipe section whose outlet temperature reaches or exceeds the preset cut-off temperature is closed, and the remaining heat storage pipe sections continue to operate; During the heat release stage, the solid heat storage system monitors the outlet temperature of the heat storage pipe section through a temperature sensor. Under the condition that the total flow rate remains unchanged, the heat storage pipe sections are opened and closed in turn to release heat evenly and extend the heat release time.

[0028] The solid heat storage system selects part of the heat storage partitions 1 to operate simultaneously according to the total flow demand and actual load conditions. The heat storage pipe section control method of a heat storage partition 1 in the heat release stage includes the following steps: The outlet valve of the first heat storage pipe section is opened for operation. When the outlet temperature of the first heat storage pipe section is lower than the cut-off temperature, the outlet valve of the second heat storage pipe section is opened to reduce the flow rate. When the average temperature of the outlet temperatures of the first heat storage pipe segment and the second heat storage pipe segment is lower than the cut-off temperature, the outlet valve of the third heat storage pipe segment is opened, and the flow rate is reduced again; Open the pipe outlet valves of all heat storage pipe sections in sequence. When the average pipe outlet temperature of all heat storage pipe sections is lower than the cut-off temperature, close the pipe outlet valve of the firstly opened heat storage pipe section, increase the flow rate, and then close the pipe outlet valves of the heat storage pipe sections in sequence according to the sequence of the pipe outlet valves of the opened heat storage pipe sections, until the pipe outlet temperature of the final heat storage pipe section is lower than the cut-off temperature, and the heat release ends.

[0029] The flow rate when the first heat storage pipe section and the second heat storage pipe section operate simultaneously is half of the flow rate when the first heat storage pipe section operates alone; the flow rate when the first heat storage pipe section, the second heat storage pipe section and the third heat storage pipe section operate together is one third of the flow rate when the first heat storage pipe section operates alone, and so on. The flow rate when several heat storage pipe sections operate together is several parts of the flow rate when the first heat storage pipe section operates alone.

[0030] The heat storage pipe section control method in a heat storage partition 1 during the heat storage stage comprises the following steps: the pipe section inlet valves of all heat storage pipe sections are opened, and all heat storage pipe sections are operated simultaneously; when the average pipe section outlet temperatures of all heat storage pipe sections are higher than the cut-off temperature, the pipe section inlet valve of the heat storage pipe section with the highest pipe section outlet temperature is closed, and the flow rates of the remaining heat storage pipe sections are increased; and then the pipe section inlet valves of the heat storage pipe sections are closed in sequence according to the outlet temperatures of the heat storage pipe sections, until finally the outlet temperatures of all pipe sections are higher than the cut-off temperature, and heat storage is completed.

[0031] The pipe segment inlet valves of all heat storage pipe segments are opened, and the flow rate of each heat storage pipe segment is a certain number, where the certain number is the number of heat storage pipe segments with the pipe segment inlet valves opened.

[0032] Embodiment 3 See also Figure 1 and Figure 2 This embodiment provides a large-scale solid heat storage system, and the specific selection and process are as follows: Determination of the total number of heat storage units and the number of partitions: The total number of required heat storage units is calculated based on the rated heat storage capacity of the system and the rated flow rates of heat storage and heat release. This calculation process takes into account the thermal capacity of the heat storage medium, the unit heat storage capacity of the heat storage module, and the fluid flow rate when the system is running to ensure that the system has the required heat storage and heat release capacity.

[0033] Based on the total number of heat storage units, the system is divided into several partitions, each of which contains a certain number of heat storage modules. The number of partitions is determined based on the heat storage demand, heat release demand and flow control requirements to ensure that each partition can independently realize heat storage and heat release operations.

[0034] Parallel combination between partitions: During the heat storage and release process, the partitions are operated in a parallel combination. That is, the inlet and outlet of each partition are simultaneously connected to the main heat storage pipeline and the main heat release pipeline, and the heat storage medium flow of all partitions is distributed in parallel to achieve multiple partitions absorbing or releasing heat at the same time. The parallel combination design between partitions can ensure that the overall system maintains a high degree of operational flexibility during heat storage and release, that is, after certain partitions reach the preset temperature or conditions, they can be independently controlled without affecting the heat storage or heat release process of other partitions.

[0035] Series-parallel combinations within a partition: Within each partition, the heat storage units are configured in a combination of series and parallel. Series and parallel is an arrangement of pipelines or circuit elements, in which parallel groups of several elements are connected in series.

[0036] This embodiment takes the layout of the heat storage modules in each partition according to four parallel pipe sections as an example. In this parallel configuration, a number of heat storage modules are arranged in each parallel pipe section, and these modules are evenly distributed on each pipe section. The modules are connected in series to ensure that the fluid medium passes through multiple heat storage modules in each pipe section in sequence to store and release heat.

[0037] The present invention realizes the reasonable configuration of the total number of heat storage units and the number of partitions, and can flexibly adjust the operation mode of each partition and pipe section according to actual needs. Since the partitions are in parallel structure, the system can flexibly enable or close some partitions according to different heat storage and heat release requirements without affecting the operation efficiency of the overall system. In addition, the scalability of the system is also fully considered. When the heat storage or flow demand increases, the heat storage capacity of the system can be expanded by adding partitions or parallel pipe sections without major modifications to the existing system structure. Through clear partition division and series-parallel combination layout, the flexibility, stability and efficiency of the system are ensured, which is suitable for multi-module combination systems in large-scale solid heat storage applications. During the entire heat storage and heat release process, the system can dynamically adjust the operating status of each module according to temperature and flow changes to achieve optimal utilization of the heat storage unit.

[0038] This embodiment provides a control method for a large-scale solid heat storage system, comprising the following steps: According to the total heat storage demand and heat storage and release flow rates of the system, the number and partitions of solid heat storage modules are calculated and designed; this embodiment estimates the total number of heat storage units according to the rated heat storage capacity; partitions are made according to the heat storage and release flow rates and the recommended flow rates of the heat storage units; the solid heat storage modules are connected in series and parallel within the partitions, and the solid heat storage modules are controlled in an orderly manner according to the different requirements of heat storage and release.

[0039] In each partition, the solid heat storage modules are arranged in series and parallel, and the temperature of each pipe section is monitored to determine the operating status of each pipe section based on the temperature change. The solid heat storage modules between partitions are connected in parallel. The system selects some partitions to operate simultaneously based on the total flow demand and actual load conditions to improve the efficiency of heat storage and heat release. In the heat storage stage, all parallel pipe sections store heat at the same time. When the outlet temperature of a pipe section reaches or exceeds the preset cut-off temperature, the inlet valve of the pipe section is closed, and other pipe sections continue to operate. In the heat storage process, all pipe sections are operated at the same time. When the average outlet temperature of the four pipe sections is higher than the cut-off temperature, the pipe section with the highest average outlet temperature is closed to keep the total flow unchanged. The flow rates of the other three pipe sections are increased, and then the pipe sections are closed in sequence according to the average outlet temperature until the final outlet temperature is higher than the cut-off temperature, and the heat storage ends. In the heat storage process, all parallel modules store heat at the same time. When a module is higher than the preset cut-off temperature, the valve in front of the module is closed. At the same time, the flow is borne by other pipe sections and closed in sequence, thereby achieving efficient heat storage.

[0040] In the heat release stage, the system monitors the outlet temperature of the pipe section, opens and closes each pipe section in sequence, keeps the total flow unchanged, so as to achieve uniform heat release and extend the heat release time. During the heat release process, the first parallel pipe section is operated first. When the outlet temperature of the first pipe section is lower than the cut-off temperature, the second parallel pipe section is connected to keep the total flow unchanged, the flow rate is halved, and when the average outlet temperature is lower than the cut-off temperature, the third pipe section is opened, the flow rate is reduced again, and finally all the pipe sections are opened. When the average outlet temperature of the four pipe sections is lower than the cut-off temperature, the first opened pipe section is closed, the flow rate is increased, and then the pipe sections are closed in the order of opening until the final outlet temperature is lower than the cut-off temperature and the heat release ends. During the heat release process, the system opens the parallel pipe sections in sequence according to demand to release heat, ensuring that the total flow remains unchanged. As the pipe sections are gradually opened, the flow rate gradually decreases to ensure uniform heat release. By gradually opening and closing the pipe sections, the heat release time is extended, the system stability is improved, and the heat output requirements under different working conditions are met.

[0041] The pipe section control method in the heat release stage of this embodiment is used to optimize the flow control, outlet temperature control and system operation efficiency during the heat release process. In a system with multiple solid heat storage modules, by sequentially opening and closing the parallel pipe sections, the heat release time is extended and the energy utilization efficiency is optimized under the premise of constant total flow. The specific implementation steps are as follows: In the initial heat release phase, the system first opens the first parallel pipe section and allows the fluid medium to release heat through this pipe section. At this time, heat release is only carried out through the first pipe section, and the temperature sensor in the system continuously monitors the outlet temperature of the first pipe section. When the outlet temperature of the first pipe section drops below the preset cut-off temperature, the system automatically connects the second parallel pipe section to put the second pipe section into the heat release state. In order to keep the total flow constant, the system adjusts the flow rate of each pipe section to half of the original flow rate, that is, when the two pipe sections release heat at the same time, the overall flow rate of the system remains unchanged.

[0042] The subsequent pipe sections are gradually opened. When the first and second pipe sections release heat at the same time, the system monitors the outlet temperatures of the two pipe sections in real time. When the average value of the outlet temperature drops below the preset cut-off temperature, the system automatically opens the third parallel pipe section to allow it to participate in heat release. With the addition of the third pipe section, the system adjusts the flow rate of each pipe section again to ensure that the total flow rate is constant when the three pipe sections release heat at the same time. At this time, the flow rate is reduced to one-third of the original flow rate. Similarly, when the system detects that the average value of the outlet temperature of the three pipe sections is lower than the cut-off temperature, the fourth pipe section is automatically connected to enter the heat release state. The total flow rate is constant, and the system adjusts the flow rate of the four pipe sections to one-fourth of the original flow rate.

[0043] When all four parallel pipe sections are in operation, the system keeps the total flow constant and continuously monitors the outlet temperature of each pipe section. When the system detects that the average outlet temperature of the four pipe sections is lower than the preset cut-off temperature, the system closes the first pipe section that was opened the earliest. By closing the first pipe section, the flow rate is increased to one-third of the original flow rate to ensure that the total flow rate remains unchanged during the heat release process. Subsequently, the remaining three pipe sections continue to release heat and maintain a stable temperature output.

[0044] The pipe sections are gradually closed. As the heat release process continues, when the average outlet temperature of the three pipe sections drops below the cut-off temperature again, the system closes the second parallel pipe section and increases the flow rate of the remaining two pipe sections accordingly, and the flow rate is adjusted to half of the original flow rate.

[0045] The process continues, and the system closes the third parallel pipe section in turn according to the outlet temperature monitoring results. At this time, the remaining last pipe section continues to release heat, and the flow rate returns to the initial flow rate. When the outlet temperature of the last pipe section also drops below the cut-off temperature, the system closes all pipe sections, marking the end of the heat release process.

[0046] Temperature monitoring and flow regulation mechanism, the entire heat release process relies on the outlet temperature sensor of each pipe section for real-time monitoring. According to the change of temperature, the system automatically adjusts the opening and closing sequence of each pipe section, and dynamically adjusts the flow rate of each pipe section according to the number of opened pipe sections to ensure that the total flow remains constant throughout the heat release process. Through the above method, the heat release control process of the present invention can accurately control the flow and heat release under the configuration of multiple parallel pipelines, extend the heat release time, and ensure that the energy in the heat storage module is maximized without reducing the efficiency of the system.

[0047] In the heat release stage control, the first parallel pipe section is operated first. When the outlet temperature of the first pipe section is lower than the cut-off temperature, the second parallel pipe section is connected, the total flow rate is kept unchanged, and the flow rate is halved. When the average outlet temperature is lower than the cut-off temperature, the third pipe section is opened, and the flow rate is reduced again. Finally, all the pipe sections are opened. When the average outlet temperature of the four pipe sections is lower than the cut-off temperature, the first opened pipe section is closed, and the flow rate is increased. Then, the pipe sections are closed in the order of opening until the final outlet temperature is lower than the cut-off temperature, and the heat release ends. The parallel pipe section control method in the heat storage stage of this embodiment is used for a solid heat storage system with a plurality of parallel pipe sections, and realizes efficient heat storage and dynamic temperature control of the fluid medium in the heat storage stage, ensuring that after the outlet temperature of each pipe section reaches the set value, the pipe section is gradually closed to avoid overheating and optimize the heat storage process. The specific implementation steps are as follows: In the initial heat storage stage, at the beginning of heat storage, all parallel pipe sections are started at the same time, the heat transfer medium flows evenly through each parallel pipe section, releases heat, and the heat storage pipe section stores heat. At this time, all pipe sections are in parallel operation, and the inlet and outlet temperatures of each pipe section are monitored in real time by temperature sensors. Each parallel pipe section absorbs heat from the heat source through the heat medium and gradually heats up. During this process, the system continuously monitors the outlet temperature of each pipe section to ensure uniformity of heat absorption and maximize heat storage efficiency.

[0048] Close pipe sections gradually. When the outlet temperature of a parallel pipe section reaches the preset cut-off temperature, the system automatically closes the inlet valve of the pipe section, stops the flow of heat medium in the pipe section, and prevents further heat absorption. At this time, the remaining pipe sections that have not reached the cut-off temperature continue to operate to maintain the heat storage process. As the outlet temperature of other pipe sections gradually approaches the cut-off temperature, the system sequentially closes the pipe sections that have reached the cut-off temperature to ensure that the pipe sections with temperatures higher than the preset value will not continue to operate to avoid overheating.

[0049] Flow regulation and temperature monitoring: When each pipe section is closed, the system automatically adjusts the total flow to ensure that the remaining pipe sections can continue to absorb enough heat. The flow rate of the heat storage medium is dynamically adjusted according to the number of closed pipe sections to ensure that the unclosed pipe sections always maintain good heat transfer during the heat storage process. The temperature sensor continuously monitors the temperature of each pipe section. When the outlet temperature of a pipe section reaches the preset cut-off temperature, the system automatically responds and closes the pipe section until all pipe sections are closed in turn.

[0050] The final closure and heat storage end, when the outlet temperature of the last parallel pipe section also reaches the cut-off temperature, the system closes the inlet valve of the pipe section, marking the end of the heat storage process. At this point, all parallel pipe sections have completed heat storage, and the entire system enters standby mode, ready to enter the subsequent heat release stage.

[0051] Temperature control mechanism and optimized heat storage efficiency. The present invention sets an independent temperature sensor in each parallel pipe section to monitor the outlet temperature of each pipe section in real time. When the outlet temperature of a pipe section reaches the set cutoff value, the system automatically closes the inlet of the pipe section to prevent it from continuing to store heat and avoid overheating. By gradually closing the pipe sections and adjusting the flow rate, the present invention can effectively avoid energy waste, while ensuring that the unclosed pipe sections can absorb enough heat, thereby improving the heat storage efficiency of the overall system.

[0052] This embodiment realizes intelligent control during the heat storage process by synchronously storing heat and shutting down the parallel pipe sections in sequence, so that each pipe section is shut down in time after reaching the cut-off temperature, avoiding overheating and maximizing the efficiency of the heat storage system.

[0053] Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a disclaimer of such subject matter, nor should it be considered that the applicants did not consider such subject matter to be part of the disclosed inventive subject matter.

[0054] The above content is a further detailed description of the present invention. It cannot be determined that the specific implementation methods of the present invention are limited to these. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, they can also make several simple deductions or substitutions, which should be regarded as belonging to the protection scope of the present invention determined by the submitted claims.

Claims

1. A large-scale solid heat storage system, characterized in that: It comprises a plurality of heat storage partitions (1), wherein the plurality of heat storage partitions (1) are arranged in parallel, the inlet of each heat storage partition (1) is commonly connected to a main heat storage pipeline, and the outlet of each heat storage partition (1) is commonly connected to a main heat release pipeline; Each heat storage partition (1) comprises a plurality of heat storage pipe sections, an inlet pipe section of each heat storage pipe section is provided with a pipe section inlet valve, an outlet pipe section of each heat storage pipe section is provided with a pipe section outlet valve, the plurality of heat storage pipe sections are arranged in parallel, the heat storage pipe section comprises a plurality of solid heat storage modules (2), the plurality of solid heat storage modules (2) are arranged in series between the pipe section inlet valve and the pipe section outlet valve, the inlet pipe section and the outlet pipe section of each heat storage pipe section are provided with a temperature sensor, the temperature sensor is connected to a temperature flow feedback control unit, and the temperature flow feedback control unit is connected to the pipe section inlet valve.

2. A large-scale solid heat storage system according to claim 1, characterized in that: A partition inlet pipe section is connected between the inlet of each heat storage partition (1) and the main heat storage pipeline, and a partition outlet pipe section is connected between the outlet of each heat storage partition (1) and the main heat release pipeline.

3. A large-scale solid heat storage system according to claim 2, characterized in that: The partition inlet pipe section is provided with a partition inlet valve, and the partition outlet pipe section is provided with a partition outlet valve.

4. A large-scale solid heat storage system according to claim 3, characterized in that: An inlet main valve is installed between each partition inlet valve and the main heat storage pipeline, and an outlet main valve is installed between each partition outlet valve and the main heat release pipeline.

5. A control method for a large-scale solid heat storage system, using a large-scale solid heat storage system according to any one of claims 1 to 4, characterized in that: The following steps are involved: Calculating the number and partitioning of the solid heat storage modules (2) according to the total heat storage demand, heat storage flow rate and heat release flow rate of the solid heat storage system; Inside each heat storage partition (1), the solid heat storage modules (2) are arranged in series and parallel, and the temperature of each heat storage pipe section is monitored, and the operating status of each heat storage pipe section is determined according to the temperature change; In the heat storage stage, all parallel heat storage pipe sections store heat at the same time. When the outlet temperature of any heat storage pipe section reaches or exceeds the preset cut-off temperature, the pipe section inlet valve of the heat storage pipe section whose outlet temperature reaches or exceeds the preset cut-off temperature is closed, and the remaining heat storage pipe sections continue to operate; During the heat release stage, the solid heat storage system monitors the outlet temperature of the heat storage pipe section through a temperature sensor. Under the condition that the total flow rate remains unchanged, the heat storage pipe sections are opened and closed in turn to release heat evenly and extend the heat release time.

6. The control method of a large-scale solid heat storage system according to claim 5, characterized in that: The solid heat storage system selects some heat storage partitions (1) to operate simultaneously according to the total flow demand and actual load conditions.

7. The control method of a large-scale solid heat storage system according to claim 5, characterized in that: The method for controlling a heat storage pipe section of a heat storage partition (1) in the heat release stage comprises the following steps: The outlet valve of the first heat storage pipe section is opened for operation. When the outlet temperature of the first heat storage pipe section is lower than the cut-off temperature, the outlet valve of the second heat storage pipe section is opened to reduce the flow rate. When the average temperature of the outlet temperatures of the first heat storage pipe segment and the second heat storage pipe segment is lower than the cut-off temperature, the outlet valve of the third heat storage pipe segment is opened, and the flow rate is reduced again; Open the pipe outlet valves of all heat storage pipe sections in sequence. When the average pipe outlet temperature of all heat storage pipe sections is lower than the cut-off temperature, close the pipe outlet valve of the firstly opened heat storage pipe section, increase the flow rate, and then close the pipe outlet valves of the heat storage pipe sections in sequence according to the sequence of the pipe outlet valves of the opened heat storage pipe sections, until the pipe outlet temperature of the final heat storage pipe section is lower than the cut-off temperature, and the heat release ends.

8. The control method of a large-scale solid heat storage system according to claim 7, characterized in that: The flow rate of the first heat storage pipe segment and the second heat storage pipe segment running simultaneously is half of the flow rate of the first heat storage pipe segment running alone; the flow rate of the first heat storage pipe segment, the second heat storage pipe segment and the third heat storage pipe segment running together is one third of the flow rate of the first heat storage pipe segment running alone, and so on, the flow rate of several heat storage pipe segments running together is a several part of the flow rate of the first heat storage pipe segment running alone.

9. The control method of a large-scale solid heat storage system according to claim 5, characterized in that: The heat storage pipe segment control method in a heat storage partition (1) during the heat storage stage comprises the following steps: the pipe segment inlet valves of all heat storage pipe segments are opened, and all heat storage pipe segments are operated simultaneously; when the average pipe segment outlet temperature of all heat storage pipe segments is higher than the cut-off temperature, the pipe segment inlet valve of the heat storage pipe segment with the highest pipe segment outlet temperature is closed, and the flow rate of the remaining heat storage pipe segments is increased; then, the pipe segment inlet valves of the heat storage pipe segments are closed in sequence according to the outlet temperature of the heat storage pipe segments, until the outlet temperature of all pipe segments is higher than the cut-off temperature, and heat storage is terminated.

10. The control method of a large-scale solid heat storage system according to claim 9, characterized in that: The pipe segment inlet valves of all heat storage pipe segments are opened, and the flow rate of each heat storage pipe segment is a certain number, where the certain number is the number of heat storage pipe segments with the pipe segment inlet valves opened.

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