A boiler system with a solid heat storage device

Abstract

The application discloses a boiler system with a solid heat storage device, which comprises a boiler body, a blast device, and an air preheater, wherein the blast device is communicated with the air preheater through an air inlet flow channel, the air preheater is communicated with a hearth through a first flow channel and a second flow channel, the solid heat storage device is arranged on the second flow channel and is configured to heat the airflow flowing therethrough, and a switching device is connected to the first flow channel and the second flow channel and is configured to make one of the first flow channel and the second flow channel in a communication state. Thus, when the second flow channel is in the communication state, the combustion temperature of the hearth can be rapidly increased to meet the requirement of rapidly increasing the load of the power grid, and the response speed is high, so that the boiler system is suitable for popularization and application.

Description

Technical Field

[0001] This application relates to the field of combustion equipment technology, and in particular to a boiler system with a solid heat storage device. Background Technology

[0002] Under the new power system architecture, the coupled characteristics of random fluctuations in load demand and renewable energy generation place stricter demands on system regulation capacity, response speed, and regulation accuracy, and also impose higher requirements on the energy efficiency of coal-fired power response systems. Therefore, optimizing and upgrading the boiler system within the coal-fired power response system to meet the load change rate requirements of the power system has become an urgent problem to be solved. Utility Model Content

[0003] This disclosure aims to address at least one of the technical problems existing in the prior art or related technologies.

[0004] Therefore, this disclosure proposes a boiler system with a solid thermal storage device.

[0005] An embodiment of this application provides a boiler system with a solid heat storage device, comprising: a boiler body, the boiler body including a furnace, an air supply device, and an air preheater, the air supply device and the air preheater being connected through an air inlet channel, and the air preheater and the furnace being connected through a first channel and a second channel; a solid heat storage device disposed on the second channel and configured to heat the flowing air; and a switching device connected to the first channel and the second channel and configured to keep one of the first channel and the second channel in a connected state.

[0006] For example, the solid thermal storage device is configured to store energy by electric heating, the boiler system is configured to be connected to the power generation module, and the solid thermal storage device is configured to be electrically connected to the power generation module to be in an energy storage state when the first flow channel is in a connected state.

[0007] For example, when the second flow channel is in the connected state, the solid thermal storage device is disconnected from the power generation module.

[0008] For example, the solid thermal energy storage device is configured to store energy by means of electric heating. When the first flow channel is in a connected state, the solid thermal energy storage device is configured to be electrically connected to an external power source to be in an energy storage state.

[0009] For example, the solid thermal storage device includes: a plurality of solid thermal storage units, each solid thermal storage unit being configured as a cylindrical structure, with a medium channel communicating with a second flow channel in the middle of the cylindrical structure; and a support frame, on which the plurality of solid thermal storage units are disposed.

[0010] For example, a solid thermal energy storage unit includes: a tube body configured as a hollow structure to form a medium channel; an electric heating element disposed within an airflow channel; and a thermal energy storage material layer disposed on the outer wall of the tube body.

[0011] For example, the thickness of the thermal storage material layer is 30 mm to 50 mm; the thermal conductivity of the thermal storage material ranges from 40 W / (m·K) to 80 W / (m·K).

[0012] For example, the wall thickness of the tube is 2mm to 5mm; the inner diameter of the tube is 50mm to 70mm; the tube includes 20G tube, 15CrMo tube and stainless steel tube; the electric heating element is an electric heating rod with a diameter of 25mm.

[0013] For example, the length of the solid thermal storage unit is 8m to 12m, the number of solid thermal storage units is 1000 to 2000, and the solid thermal storage device is configured as a cuboid structure.

[0014] For example, a boiler system with a solid thermal storage device further includes: an exhaust device, which is connected to the furnace through an exhaust channel; a superheater, a reheater, an economizer, a denitrification device, and a dust removal device are sequentially arranged in the exhaust channel from the furnace to the exhaust device; wherein the exhaust channel between the denitrification device and the dust removal device passes through an air preheater.

[0015] The boiler system with solid thermal energy storage device provided in this application embodiment, by adding a solid thermal energy storage device and reasonably setting the location and energy storage method of the solid thermal energy storage device, enables a single solid thermal energy storage device to meet the requirements of the power grid for rapid load increase and decrease, and can meet the requirements of the circuit system load change rate. It has a simple structure, fast response speed, and is conducive to maintaining the safe and stable operation of the power system, making it suitable for widespread application.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0018] Figure 1 One of the schematic block diagrams of a boiler system provided in an embodiment of this application is shown;

[0019] Figure 2 One of the schematic structural diagrams of a solid thermal energy storage unit provided in an embodiment of this application is shown;

[0020] Figure 3 One of the schematic cross-sectional views of a solid thermal energy storage unit provided in an embodiment of this application is shown.

[0021] in, Figures 1 to 3 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0022] 110 Furnace, 120 Air supply device, 130 Air preheater, 140 First flow channel, 150 Second flow channel, 160 Solid thermal storage device, 161 Solid thermal storage unit, 162 Tube body, 1621 Medium channel, 163 Electric heating element, 164 Thermal storage material layer, 170 Exhaust flow channel, 180 Superheater, 190 Reheater, 200 Economizer, 210 Denitrification device, 220 Dust removal device, 230 Air inlet flow channel. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the description of these embodiments is intended to aid in understanding the present invention, but does not constitute a limitation thereof. The specific structural and functional details disclosed herein are only for describing exemplary embodiments of the present invention. However, the present invention may be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0024] like Figure 1 As shown in the embodiment of this application, a boiler system with a solid heat storage device is provided, including: a boiler body, the boiler body including a furnace 110, an air supply device 120, and an air preheater 130, the air supply device 120 and the air preheater 130 being connected through an air inlet channel 230, and the air preheater 130 and the furnace 110 being connected through a first channel 140 and a second channel 150; a solid heat storage device 160, disposed on the second channel 150, configured to heat the airflow passing through it; and a switching device, connected to the first channel 140 and the second channel 150, configured to keep one of the first channel 140 and the second channel 150 in a connected state.

[0025] The air supply device 120 is configured to deliver gas to the furnace 110 to improve the combustion efficiency of the furnace 110. The air preheater 130, also known as an air preheater, is configured to heat the air flowing through it. Therefore, the airflow provided by the air supply device 120 is heated by the air preheater 130 and then delivered to the furnace 110. The air preheater 130 is configured to preheat the air entering the furnace 110 to a preset temperature to improve the heat exchange performance of the boiler and reduce energy consumption.

[0026] The coal-fired power response system includes a boiler system and a power generation module. The boiler system is connected to the power generation module, and the power generation module is connected to the power grid to supply power to the grid.

[0027] The boiler system provided in this application embodiment includes a boiler body, a solid heat storage device 160, and a switching device. The boiler body includes a furnace 110, an air supply device 120, and an air preheater 130. The air supply device 120 and the air preheater 130 are connected through an air inlet channel 230. The air preheater 130 and the furnace 110 are connected through a first channel 140 and a second channel 150. The solid heat storage device 160 is disposed on the second channel 150. The switching device is configured to keep one of the first channel 140 and the second channel 150 in a connected state.

[0028] Therefore, when the switching device connects the first flow channel 140 and disconnects the second flow channel 150, the air supply device 120 heats the airflow through the air preheater 130 and then delivers it to the furnace 110 through the first flow channel 140 to increase the combustion temperature of the furnace 110, thereby enabling the boiler system to operate stably, maintaining the stability of the coal-fired power response system, and ensuring that the power grid has high stability.

[0029] When the switching device connects the second flow channel 150 and disconnects the first flow channel 140, the air supply device 120 heats the airflow for the first time in the air preheater 130, then reheats it in the second flow channel 150 by the solid heat storage device 160 before delivering it into the furnace 110. Because the airflow entering the furnace 110 is doubly heated by the air preheater 130 and the solid heat storage device 160, the airflow temperature is greatly increased. This rapidly increases the combustion temperature of the furnace 110, quickly improving the power generation efficiency of the power system to meet the rapid load increase requirements of the power system and grid, thereby satisfying the power system load change rate requirements. The airflow delivery path from the air supply device 120 to the furnace 110 is as follows: Figure 1 As shown by the solid arrow in the image.

[0030] Understandably, in response to the grid's demand for rapid load increases, boiler systems in related technologies typically adjust their parameters. However, because the entire process from coal milling and in-furnace combustion to the increase in steam parameters is relatively lagging, the boiler system's power generation efficiency takes a long time to meet the grid's load increase requirements, resulting in a long time consumption, low efficiency, and a lag problem.

[0031] The boiler system provided in this application embodiment, by adding a solid heat storage device 160, can quickly increase the combustion temperature of the furnace 110 when the power grid requires a rapid load increase. This is achieved by the air supply device 120 delivering the airflow to the furnace 110 after double heating by the air preheater 130 and the solid heat storage device 160. This can quickly meet the power grid's load increase requirements, with a shorter time, higher efficiency, and faster response speed. It is beneficial for maintaining the safe and stable operation of the power system and is suitable for widespread application.

[0032] The switching device may include a switching valve or other switching structure. It is understood that the boiler system also includes a control device, which is communicatively connected to the switching device to adjust the gear status of the switching device, so that the switching device can connect the first flow channel 140 and disconnect the second flow channel 150, or the switching device can disconnect the first flow channel 140 and connect the second flow channel 150.

[0033] The air supply device 120 can be a fan device or other airflow conveying device.

[0034] In some possible embodiments provided in this application, the solid thermal storage device 160 is configured to store energy by electric heating, the boiler system is configured to be connected to the power generation module, and the solid thermal storage device 160 is configured to be electrically connected to the power generation module to be in an energy storage state when the first flow channel 140 is in a connected state.

[0035] In this embodiment, since the solid thermal energy storage device 160 is configured to store energy through electric heating, when the first flow channel 140 is connected and the second flow channel 150 is disconnected—that is, when the air supply device 120 heats the airflow through the air preheater 130 and then delivers it to the furnace 110 through the first flow channel 140—the solid thermal energy storage device 160 is electrically connected to the power generation module to put it in an energy storage state. This allows the solid thermal energy storage device 160 to consume the load of the power grid connected to the boiler system, thereby meeting the grid's load reduction requirements and rapidly reducing the grid load in a short time to meet the grid's need for rapid load reduction, thus satisfying the power system's load change rate requirements. Simultaneously, this achieves the recycling of electrical energy generated by the boiler system, which is beneficial for energy conservation.

[0036] Understandably, in the face of the grid's demand for rapid load reduction, boiler systems in related technologies usually adjust their parameters. However, because the entire process from coal milling, in-furnace combustion to the reduction of steam parameters is relatively lagging, the power generation efficiency of the boiler system needs a long time to meet the grid's demand for rapid load reduction. This results in a long time, low efficiency, and a lag problem.

[0037] The boiler system provided in this application embodiment, by adding a solid thermal storage device 160, can quickly meet the grid's demand for rapid load reduction by connecting the solid thermal storage device 160 to the power generation module connected to the boiler system to consume the load when the grid requires rapid load reduction. This is because it takes less time, is more efficient, and has a faster response speed, which is conducive to maintaining the safe and stable operation of the power system and is suitable for widespread application.

[0038] In other words, the boiler system improved in this application embodiment, by adding a solid thermal storage device 160 and reasonably setting the location and energy storage method of the solid thermal storage device 160, enables a single solid thermal storage device 160 to meet the requirements of the power grid for rapid load increase and decrease, and can meet the requirements of the circuit system load change rate. It has a simple structure, fast response speed, and is conducive to maintaining the safe and stable operation of the power system, making it suitable for widespread application.

[0039] Furthermore, selecting appropriate energy storage technologies for coal-fired power response systems is crucial for improving renewable energy utilization efficiency, enhancing the peak-shaving and load-changing capabilities of thermal power generation, and alleviating grid dispatch pressure. Solid thermal storage devices 160 utilize solids as the primary thermal storage medium or component. They offer numerous advantages, including relatively constant volume, wide availability of materials, stable chemical properties, low cost, and excellent thermal storage capacity.

[0040] In some possible embodiments provided in this application, when the second flow channel 150 is in a connected state, the solid thermal storage device 160 is disconnected from the power generation module.

[0041] Since the second flow channel 150 is connected and the first flow channel 140 is disconnected, the air supply device 120 delivers the airflow to the furnace 110 after secondary heating through the air preheater 130 and the solid thermal storage device 160, in order to meet the grid's requirement for rapid load increase. Therefore, while the second flow channel 150 is connected, the solid thermal storage device 160 is disconnected from the power generation module to prevent the solid thermal storage device 160 from consuming the power of the grid connected to the boiler system, thus ensuring that the grid can meet the requirement for rapid load increase.

[0042] In some possible embodiments provided in this application, the solid thermal storage device 160 is configured to store energy by means of electric heating. When the first flow channel 140 is in a connected state, the solid thermal storage device 160 is configured to be electrically connected to an external power source to be in an energy storage state.

[0043] In this embodiment, since the solid thermal energy storage device 160 is configured to store energy via electric heating, when the first flow channel 140 is in a connected state—that is, when the air supply device 120 heats the airflow through the air preheater 130 and then delivers it to the furnace 110 through the first flow channel 140—the solid thermal energy storage device 160 can be connected to an external power source to put it into an energy storage state. In other words, the energy storage process of the solid thermal energy storage device 160 does not consume electricity from the power grid connected to the boiler system. This configuration ensures the stability of the power supply from the power grid connected to the boiler system.

[0044] In other words, when the first flow channel 140 is connected, if the power grid connected to the boiler system requires a rapid load reduction, the solid thermal storage device 160 can be electrically connected to the power grid connected to the boiler system, allowing the solid thermal storage device 160 to store energy using the electricity provided by the boiler system. If the power grid connected to the boiler system requires maintaining the current load, i.e., neither increasing nor decreasing the load is necessary, the solid thermal storage device 160 can be connected to an external power source for energy storage. This will not affect the power supply stability of the power grid connected to the boiler system, which is beneficial for maintaining the safe and stable operation of the power system and has strong practicality.

[0045] Specifically, in this embodiment, when the boiler system is running stably, the air supply device 120 heats the airflow through the air preheater 130 and then delivers it to the furnace 110 via the first flow channel 140. When the power grid requires a rapid load increase, since the entire process of the boiler system from the coal mill, in-furnace combustion, to the increase of steam parameters is relatively slow, the airflow preheated by the air preheater 130 is switched to the second flow channel 150, where it is reheated by the preheated solid thermal storage device 160 and then sent into the furnace 110, rapidly increasing the combustion temperature of the furnace 110 and thus rapidly increasing the boiler load. When the power grid requires a load decrease, the power supply of the power generation module connected to the boiler system is directly connected to the solid thermal storage device 160, enabling the unit to quickly reduce its load without affecting the unit's load reduction rate due to the slow boiler response.

[0046] like Figure 2 and Figure 3 As shown, in some possible embodiments provided in this application, the solid thermal storage device 160 includes: a plurality of solid thermal storage units 161, each solid thermal storage unit 161 being configured as a cylindrical structure, with a medium channel 1621 communicating with the second flow channel 150 in the middle of the cylindrical structure; and a support frame, on which the plurality of solid thermal storage units 161 are disposed.

[0047] The solid thermal energy storage device 160 may be equipped with multiple solid thermal energy storage units 161 and a support frame. Each solid thermal energy storage unit 161 can store heat independently, and the support frame provides fixed support for multiple solid thermal energy storage units 161 to form the solid thermal energy storage device 160.

[0048] The solid thermal storage unit 161 can be in the form of a cylindrical structure. A medium channel 1621 is provided in the middle of the cylindrical structure. The medium channel 1621 can be connected to the second flow channel 150. When the gas flowing from the air preheater 130 to the second flow channel 150 passes through the medium channel 1621 of the cylindrical structure, the gas can be heated by the solid thermal storage unit 161 to form high-temperature gas.

[0049] like Figure 2 and Figure 3 As shown, in some possible embodiments provided in this application, the solid thermal storage unit 161 includes: a tube 162, which is configured as a hollow structure to form a medium channel 1621; an electric heating element 163 disposed in the medium channel 1621; and a thermal storage material layer 164 disposed on the outer wall of the tube 162.

[0050] This embodiment discloses the specific structure of a solid thermal energy storage unit 161. The solid thermal energy storage unit 161 includes a tube 162, an electric heating element 163, and a thermal energy storage material layer 164. The tube 162 is cylindrical, and its hollow structure forms a medium channel 1621. The electric heating element 163 is disposed within the medium channel 1621, and the thermal energy storage material layer 164 is disposed on the outer periphery of the tube 162, meaning the thermal energy storage material layer 164 is entirely cylindrical. With this configuration, by supplying power to the electric heating element 163, heat is generated, and the electric heating element 163 radiates heat to the tube 162, thereby storing thermal energy through the thermal energy storage material layer 164.

[0051] In some possible embodiments provided in this application, the thickness of the heat storage material layer 164 is 30 mm to 50 mm, and the thermal conductivity of the heat storage material ranges from 40 W / (m·K) to 80 W / (m·K).

[0052] In this embodiment, by reasonably setting the thickness of the heat storage material layer 164 and the thermal conductivity of the heat storage material, the solid heat storage unit 161 is guaranteed to have a good heat storage effect.

[0053] Specifically, the thickness of the thermal storage material layer 164 can be 30mm, 35mm, 40mm, 45mm, 50mm, or other sizes.

[0054] Specifically, the thermal conductivity of the thermal storage material can be 40 W / (m·K), 50 W / (m·K), 60 W / (m·K), 70 W / (m·K), 80 W / (m·K), or other values. Silicon carbide can be used as the thermal storage material for the thermal storage material layer 164.

[0055] In some possible embodiments provided in this application, the wall thickness of the tube body 162 is 2 mm to 5 mm; the inner diameter of the tube body 162 is 50 mm to 70 mm; the tube body 162 includes 20G tube body, 15CrMo tube body and stainless steel tube body.

[0056] In this embodiment, by reasonably setting the size and material of the tube 162, the tube 162 is guaranteed to have good structural strength and heat conduction effect.

[0057] Specifically, the wall thickness of the tube 162 can be 2mm, 3mm, 4mm, 5mm, or other sizes.

[0058] Specifically, the inner diameter of the tube 162 can be 50mm, 55mm, 60mm, 65mm, 70mm, or other sizes.

[0059] Specifically, the material of tube body 162 can be 20G, 15CrMo, stainless steel, etc.

[0060] In some possible embodiments provided in this application, the electric heating element 163 is an electric heating rod, wherein the electric heating rod is cylindrical, which facilitates placement within the medium channel 1621. Furthermore, the electric heating rod and the medium channel 1621 are coaxially arranged, which can improve the uniformity of heating the tube 162 by the electric heating rod, thereby improving the uniformity of heat energy stored in the heat storage material layer 164.

[0061] The diameter of the electric heating rod can be 25mm. By reasonably setting the diameter of the electric heating rod, it can be ensured that the medium channel 1621 has enough space for airflow to pass through, and at the same time, it can be ensured that the electric heating rod has a good heating effect.

[0062] In some possible embodiments provided in this application, the length of the solid thermal storage unit 161 is 8m to 12m. By reasonably setting the length of the solid thermal storage unit 161, the solid thermal storage unit 161 can have a good thermal storage effect.

[0063] Specifically, the length of the solid thermal storage unit 161 can be 8m, 9m, 10m, 11m, 12m, or other sizes.

[0064] In some possible embodiments provided in this application, the number of solid thermal storage units 161 is 1,000 to 2,000, and the solid thermal storage device 160 is configured as a cuboid structure.

[0065] In this embodiment, the number of solid thermal storage units 161 can be 1,000 to 2,000, and they are formed into a solid thermal storage device 160 by a support frame. As a result, the solid thermal storage device 160 has a high thermal storage capacity and meets the requirements of the power grid for rapid load change.

[0066] By making the solid thermal storage device 160 present a cuboid structure, the solid thermal storage device 160 has good stability, and its overall shape is relatively regular, occupying less space.

[0067] It is understandable that during the heat release process of the solid thermal storage device 160, only some of the solid thermal storage units 161 may perform the heat release operation. By rationally setting the number of solid thermal storage units 161, when the power grid connected to the boiler system needs to reduce its load, the solid thermal storage device 160 can be connected to the system's charging module to reduce the grid load and store thermal energy. When the grid needs to increase its load, some of the solid thermal storage units 161 can release heat to heat the airflow flowing through the second flow channel 150, rapidly increasing the combustion temperature of the furnace 110, thereby quickly increasing the boiler load to meet the grid dispatch requirements for unit load increase operation. Similarly, when the grid needs to increase its load again, another portion of the solid thermal storage units 161 can release heat to heat the airflow flowing through the second flow channel 150, rapidly increasing the combustion temperature of the furnace 110, thereby quickly increasing the boiler load to meet the grid dispatch requirements for unit load increase operation.

[0068] In other words, by rationally setting the number of solid thermal energy storage units 161, the solid thermal energy storage device 160 can utilize the thermal energy stored in the power grid to meet the needs of the unit to increase its load during multiple grid dispatches, making the entire system more balanced. This simplifies the operation of connecting the solid thermal energy storage device 160 to an external power source for energy storage, which is beneficial for saving energy and simplifying the structure.

[0069] like Figure 1 As shown, in some possible embodiments provided in this application, the boiler system further includes: an exhaust device, which is connected to the furnace 110 through an exhaust channel 170; a superheater 180, a reheater 190, an economizer 200, a denitrification device 210, and a dust removal device 220 are sequentially arranged in the exhaust channel 170 along the furnace 110 to the exhaust device; wherein, the exhaust channel 170 between the denitrification device 210 and the dust removal device 220 passes through an air preheater 130.

[0070] In this embodiment, the exhaust system is connected to the furnace 110 via the exhaust channel 170 to discharge the flue gas inside the furnace 110. Specifically, the flue gas inside the furnace 110 passes sequentially through the superheater 180, reheater 190, economizer 200, denitrification device 210, and dust removal device 220 before being discharged by the exhaust system. The exhaust system can be a fan. The discharge path of the flue gas inside the furnace 110 is as follows: Figure 1 As shown by the dashed arrow in the image.

[0071] In this embodiment, the exhaust flow channel 170 between the denitrification device 210 and the dust removal device 220 passes through the air preheater 130. That is, the flue gas passes through the exhaust flow channel 170, is treated by the denitrification device 210, is heated by the air preheater 130, and is then treated by the dust removal device 220 before being discharged.

[0072] In other words, the air preheater 130 provided in this application embodiment can not only heat the airflow provided by the air supply device 120, but also heat the flue gas discharged in the furnace 110, making the air preheater 130 more functional, which is conducive to simplifying the structure and saving costs.

[0073] Furthermore, the specific process of heat storage and release in the solid heat storage device 160 of the boiler system provided in this application embodiment is as follows:

[0074] Thermal storage process: When the power grid dispatch requires the unit to reduce its load, the power supply of the power generation module connected to the boiler system is directly connected to the electric heating rod of the solid thermal storage device 160 to continuously heat the solid thermal storage material layer 164 until it reaches the preset temperature. At the same time, this achieves the purpose of rapidly reducing the power supply to the power grid and reducing the load on the unit. In this case, the switching device controls the first flow channel 140 to be in the connected state and the second flow channel 150 to be in the disconnected state. The airflow provided by the air supply device 120 is preheated by the air preheater 130 and then delivered to the furnace 110 through the first flow channel 140.

[0075] Heat release process: When the power grid dispatch requires the unit to increase its load, the switching device controls the second flow channel 150 to be in the connected state and the first flow channel 140 to be in the disconnected state. The airflow provided by the air supply device 120 is preheated by the air preheater 130 and then reheated by the solid heat storage device 160 before being delivered to the furnace 110 through the second flow channel 150. Because the airflow is heated by the solid heat storage device 160, the temperature of the airflow provided by the air supply device 120 can be heated from 300℃~330℃ (unit operating at 60% load and above) to 350±5℃, or from 270℃~300℃ (unit operating at 60% load and below) to 350±5℃ before being delivered into the furnace 110. This can rapidly increase the combustion temperature of the furnace 110, thereby quickly increasing the boiler load to meet the power grid dispatch requirements for the unit to increase its load.

[0076] The boiler system provided in this application embodiment can improve the boiler load change rate through solid thermal storage technology, so as to meet the requirements of the power grid load change connected to the boiler system in a short time. It has a fast response speed and is suitable for widespread application.

[0077] In the description of this application, the term "multiple" refers to two or more. Unless otherwise expressly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0078] In the description of this application, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0079] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0080] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A boiler system with a solid heat storage device, characterized in that, include: The boiler body includes a furnace, an air supply device, and an air preheater. The air supply device is connected to the air preheater through an air inlet channel, and the air preheater is connected to the furnace through a first channel and a second channel. A solid thermal energy storage device is installed on the second flow channel and configured to heat the flowing air. A switching device, connected to the first flow channel and the second flow channel, is configured to keep one of the first flow channel and the second flow channel in a connected state.

2. The boiler system with a solid thermal storage device according to claim 1, characterized in that, The solid thermal storage device is configured to store energy through electric heating. The boiler system is configured to be connected to the power generation module. When the first flow channel is in a connected state, the solid thermal storage device is configured to be electrically connected to the power generation module to be in an energy storage state.

3. The boiler system with a solid thermal storage device according to claim 2, characterized in that, When the second flow channel is in a connected state, the solid thermal storage device is disconnected from the power generation module.

4. The boiler system with a solid thermal storage device according to claim 1, characterized in that, The solid thermal storage device is configured to store energy by means of electric heating. When the first flow channel is in a connected state, the solid thermal storage device is configured to be electrically connected to an external power source to be in an energy storage state.

5. The boiler system with a solid thermal storage device according to any one of claims 1 to 4, characterized in that, The solid thermal storage device includes: Multiple solid thermal storage units, wherein each solid thermal storage unit is configured as a cylindrical structure, and a medium channel communicating with the second flow channel is provided in the middle of the cylindrical structure; A support frame, on which multiple solid thermal storage units are disposed.

6. The boiler system with a solid thermal storage device according to claim 5, characterized in that, The solid thermal storage unit includes: A tube body, wherein the tube body is configured as a hollow structure to form the medium channel; An electric heating element is disposed within the airflow channel; A heat storage material layer is disposed on the outer wall of the tube.

7. The boiler system with a solid thermal storage device according to claim 6, characterized in that, The thickness of the heat storage material layer is 30mm to 50mm; The thermal conductivity of the heat storage material ranges from 40 W / (m·K) to 80 W / (m·K).

8. The boiler system with a solid thermal storage device according to claim 6, characterized in that, The wall thickness of the tube is 2mm to 5mm; The inner diameter of the tube is 50mm to 70mm; The tube body includes 20G tube body, 15CrMo tube body and stainless steel tube body; The electric heating element is an electric heating rod with a diameter of 25mm.

9. The boiler system with a solid thermal storage device according to claim 6, characterized in that, The solid thermal storage unit has a length of 8m to 12m, the number of solid thermal storage units is 1000 to 2000, and the solid thermal storage device is configured as a cuboid structure.

10. A boiler system with a solid thermal storage device according to any one of claims 1 to 4, characterized in that, Also includes: An exhaust system, wherein the exhaust system is connected to the furnace through an exhaust channel; The superheater, reheater, economizer, denitrification device, and dust removal device are sequentially arranged in the exhaust channel along the furnace to the exhaust device. The exhaust channel between the denitrification device and the dust removal device passes through the air preheater.

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