External independent heat exchange detection and control system of solid electric heat storage furnace

Abstract

The utility model relates to an external independent heat exchange detection and control system of a solid electric heat storage furnace, which comprises a preheating section heat storage boiler, a saturation section heat storage boiler, an overheating section heat storage boiler, a steam-water separation device, a waste heat recovery heat exchange device and a control system, the preheating section heat storage boiler, the saturation section heat storage boiler, the overheating section heat storage boiler, the steam-water separation device and the waste heat recovery heat exchange device are connected in series through pipelines, and the preheating section heat storage boiler, the saturation section heat storage boiler and the overheating section heat storage boiler are all connected with solid heat accumulators capable of converting electric energy into heat energy and storing the heat energy. The control system controls and adjusts uniform release of heat energy of all the solid heat accumulators through the air temperature detection devices, the air volume detection devices and the air volume control devices which are connected to all the solid heat accumulators, relative balance of heat accumulation and heat release of the solid heat accumulators is achieved, the control system is simplified, and later maintenance is better facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of solid electric heat storage, in particular to an external independent heat exchange detection and control system for a solid electric heat storage furnace. Background Art

[0002] With the rapid development of the field of solid electric thermal storage, various heat-using fields are investing a lot of money in the research and development of new solid electric thermal storage modes to meet different heat needs. At present, traditional solid electric thermal storage technology mainly uses large-volume thermal storage bodies corresponding to multi-module heat exchangers. Therefore, in order to achieve the correspondence between thermal storage bodies and heat exchangers and ensure the balance of heat storage and heat release in the design, traditional solid electric thermal storage technology needs to design and rely on cumbersome control systems. The cumbersome control system not only brings complexity to the design, but also puts higher requirements on the operation of the staff and adds a certain burden on the operation and maintenance of the equipment in the later stage. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the utility model provides an external independent heat exchange detection and control system for a solid electric heat storage furnace, which solves the problem that the corresponding relationship between the heat storage body and the heat exchanger of the traditional solid electric heat storage device is difficult to control and the control system is relatively cumbersome.

[0004] In order to achieve the above technical effects, the present invention adopts the following technical solutions:

[0005] A solid electric heat storage furnace external independent heat exchange detection and control system includes a preheating section heat storage boiler, a saturation section heat storage boiler, a superheating section heat storage boiler, a steam-water separation device, a waste heat recovery heat exchange device and a control system. The preheating section heat storage boiler, the saturation section heat storage boiler, the superheating section heat storage boiler, the steam-water separation device and the waste heat recovery heat exchange device are connected in series through pipelines. The preheating section heat storage boiler, the saturation section heat storage boiler and the superheating section heat storage boiler are all connected to a solid heat storage body that can convert electrical energy into thermal energy and store it. The control system controls and adjusts the uniform release of heat energy of each solid heat storage body through an air temperature detection device, an air volume detection device and an air volume control device connected to each solid heat storage body.

[0006] Furthermore, one end of the solid heat storage body located in the saturated section heat storage boiler is collected into the high-temperature air main pipe through at least one group of high-temperature air branch pipes and connected to the saturated heat exchange device, and one end of the saturated heat exchange device is collected into the low-temperature air main pipe through at least one group of low-temperature air branch pipes via a circulating fan and connected to the other end of the solid heat storage body.

[0007] Furthermore, one end of the solid heat storage body located in the saturated section heat storage boiler is collected into the high-temperature air main pipe through at least one group of high-temperature air branch pipes and connected to the saturated heat exchange device, and one end of the saturated heat exchange device is collected into the low-temperature air main pipe through at least one group of low-temperature air branch pipes via a circulating fan and connected to the other end of the solid heat storage body.

[0008] Furthermore, one end of the solid heat storage body located in the superheating section heat storage boiler is collected into the high-temperature air main pipe through at least one group of high-temperature air branch pipes and connected to the superheat heat exchange device, and one end of the superheat heat exchange device is collected into the low-temperature air main pipe through the circulating fan through at least one group of low-temperature air branch pipes and connected to the other end of the solid heat storage body.

[0009] Furthermore, the preheating heat exchange device is a shell and tube heat exchanger, the shell side inlet side of which is connected to the high-temperature air main pipeline, the shell side outlet side is connected to the circulating fan, the tube side inlet side is connected to the waste heat recovery heat exchange device through the waste heat recovery pipeline, and the tube side outlet side is connected to the saturated section heat storage boiler through the preheated water pipe.

[0010] Furthermore, the saturated heat exchange device is a shell and tube heat exchanger, the shell side inlet side of which is connected to the high-temperature air main pipeline, the shell side outlet side is connected to the circulating fan, the tube side inlet side is connected to the preheating section heat storage boiler through the preheating water pipe, and the tube side outlet side is connected to the steam-water separation device through the wet steam pipe.

[0011] Furthermore, the superheat heat exchange device is a shell and tube heat exchanger, the shell side inlet side of which is connected to the high-temperature air main pipeline, the shell side outlet side is connected to the circulating fan, the tube side inlet side is connected to the steam-water separation device through a dry steam pipeline, and the tube side outlet side is connected to the superheated steam pipeline.

[0012] Furthermore, the steam-water separation device is provided with three connection ports, the first port is connected to the saturated heat exchange device through a wet steam pipe, the second port is connected to the superheat heat exchange device through a dry steam pipe, and the third port is connected to the waste heat recovery heat exchange device through a separation water pipe.

[0013] Furthermore, one end of the steam-water separation device is connected to the steam-water separation device through a separation water pipe, and the other end is connected to the preheating heat exchange device through a waste heat recovery pipe.

[0014] Furthermore, the control system includes:

[0015] The wind temperature detection device is arranged on the high-temperature wind branch pipe and connected to the high-temperature wind branch pipe;

[0016] An air volume detection device is provided on the low-temperature air branch pipe and is connected to the low-temperature air branch pipe;

[0017] An air volume control device is provided on the low-temperature air branch duct and is connected to the low-temperature air branch duct;

[0018] The air volume detection device is used to collect the real-time air intake volume and balance the air volume on each low-temperature air branch duct through the air volume control device, so that the air volume is at the maximum value that can be achieved. When the air temperature detection device detects that the local air temperature is too high and the opening of the corresponding air volume control device has not reached 100%, the air volume control device increases the opening to increase the air volume. Beneficial effects

[0019] 1. The utility model integrates the heat exchange modes of multiple modules of large-scale equipment into one or several large-scale heat exchange devices according to their functional categories. Heat exchange devices with different functions correspond to corresponding solid thermal storage bodies, that is, one solid thermal storage body corresponds to one large-scale heat exchanger, and each heat exchanger is equipped with a circulating fan to control the output of the rated heat medium to ensure that the heat storage and output conditions at each position of the solid thermal storage body are relatively balanced. This realizes the technical feasibility of a single large-scale heat exchanger corresponding to solid thermal storage, and simplifies the heat exchange system and control system.

[0020] 2. The utility model provides corresponding air volume control devices and measuring devices in each air branch duct to ensure the relative balance of ventilation volume in each branch, thereby ensuring the relative balance of heat storage and heat release of the solid heat storage body, and thus realizing the technical feasibility of a single large heat exchanger corresponding to solid heat storage. At the same time, the heat exchange detection and control system also achieves a significant reduction in the number of control points, further simplifies the control logic, and reduces the burden on subsequent operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure and connection relationship of the utility model.

[0022] Figure 2 This is a schematic diagram of the control flow of the utility model.

[0023] In the figure: 1. solid heat storage body, 2. preheating heat exchange device, 2-1. preheating water pipe, 3. circulating fan, 4. high-temperature air main pipe, 5. low-temperature air main pipe, 6. control system, 7. high-temperature air branch pipe, 8. air temperature detection device, 9. low-temperature air branch pipe, 10. air volume detection device, 11. air volume control device, 12. saturated heat exchange device, 12-1. wet steam pipe, 13. steam-water separation device, 13-1. dry steam pipe, 13-2. separation water pipe, 14. superheating heat exchange device, 14-1. superheated steam pipe, 15. waste heat recovery heat exchange device, 15-1. water supply pipe, 15-2. waste heat recovery pipe, 15-3. drain pipe. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0025] It should be noted that, unless otherwise specified, the technical or scientific terms used in this disclosure should have the ordinary meanings understood by those skilled in the art to which this disclosure pertains. In this disclosure, relational terms such as "first" and "second" are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Terms such as "connected" and "connected" should be interpreted broadly, meaning, for example, fixedly connected, removably connected, or integrally connected; mechanically connected, electrically connected; directly connected, or indirectly connected through an intermediary. The terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. Without further limitation, the phrase "comprises..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising the elements.

[0026] See also Figure 1-2 The utility model provides an external independent heat exchange detection and control system for a solid electric heat storage furnace, including a preheating section heat storage boiler, a saturation section heat storage boiler, a superheating section heat storage boiler, a steam-water separation device, a waste heat recovery heat exchange device and a control system. The preheating section heat storage boiler, the saturation section heat storage boiler, the superheating section heat storage boiler, the steam-water separation device, and the waste heat recovery heat exchange device are connected in series through pipelines. The preheating section heat storage boiler, the saturation section heat storage boiler, and the superheating section heat storage boiler are all connected with a solid heat storage body that can convert electrical energy into thermal energy and store it. The control system is used to control and adjust the uniform release of thermal energy of each solid heat storage body.

[0027] This embodiment provides an independent heat exchange detection and control system for a solid electric heat storage furnace. Figure 1As shown, it includes a preheating section heat storage boiler, a saturation section heat storage boiler, a superheating section heat storage boiler, a steam-water separation device 13, a waste heat recovery and heat exchange device 15 and a control system 6. The preheating section heat storage boiler is connected to the preheating heat exchange device 2 by collecting the high-temperature air from one end of the solid heat storage body 1 through n (n ≥ 1) groups of high-temperature air branch pipes 7 to the high-temperature air main pipe 4, and then passing through the circulating fan 3 through n (n ≥ 1) groups of low-temperature air branch pipes 9 to the low-temperature air main pipe 5 and connected to the other end of the solid heat storage body 1. It is characterized in that it also includes: a solid heat storage body 1, which converts high-voltage electrical energy into thermal energy and stores the thermal energy in the solid heat storage body, one end of which is connected to the high-temperature air main pipe 4 through n (n≥1) groups of high-temperature air branch pipes 7, and the other end is connected to the low-temperature air main pipe 5 through n (n≥1) groups of low-temperature air branch pipes 9; an air temperature detection device 8, which is arranged on the high-temperature air branch pipe 7 and connected to the high-temperature air branch pipe 7; an air volume detection device 10, which is arranged on the low-temperature air branch pipe 9 and connected to the low-temperature air branch pipe 9; an air volume control device 11, which is arranged on the low-temperature air branch pipe 9 and connected to the low-temperature air branch pipe 9; a preheating heat exchange device 2, which is a shell and tube heat exchanger, The shell side inlet is connected to the high-temperature air main duct 4, the shell side outlet is connected to the circulation fan 3, the tube side inlet is connected to the waste heat recovery pipeline 15-2, and the tube side outlet is connected to the preheating water pipeline 2-1; the circulation fan 3 is a power device for forced circulation of hot air inside the equipment, and is connected to one end of the preheating heat exchange device 2, and the other end is connected to the low-temperature air main duct 5; the saturated section heat storage boiler, from one end of the solid heat storage body 1 through n (n ≥ 1) groups of high-temperature air branch pipes 7 to the high-temperature air main duct 4 and connected to the saturated heat exchange device 12, and then through the circulation fan 3 through n (n ≥ 1) groups of low-temperature air branch pipes 9 to the low-temperature air main duct 5 and connected to the other end of the solid heat storage body 1. It is characterized in that it also includes: a saturated heat exchange device 12, which is a shell and tube heat exchanger, the shell side inlet side is connected to the high-temperature air main duct 4, the shell side outlet side is connected to the circulation fan 3, the tube side inlet side is connected to the preheated water pipe 2-1, and the tube side outlet side is connected to the wet steam pipe 12-1; the circulation fan 3 is a power device for forced circulation of hot air inside the equipment, and is connected to one end of the saturated heat exchange device 12, and the other end is connected to the low-temperature air main duct 5; the superheating section heat storage boiler, from one end of the solid heat storage body 1 through n (n≥1) groups of high-temperature air branch pipes 7 to the high-temperature air main duct 4 and connected to the superheating heat exchange device 14, and then through the circulation fan 3 through n (n≥1) groups of low-temperature air branch pipes 9 to the low-temperature air main duct 5 and connected to the other end of the solid heat storage body 1.It is characterized in that it also includes: an overheating heat exchange device 14, which is a shell and tube heat exchanger, the shell side inlet side is connected to the high-temperature air main pipeline 4, the shell side outlet side is connected to the circulation fan 3, the tube side inlet side is connected to the dry steam pipeline 13-1, and the tube side outlet side is connected to the overheating steam pipeline 14-1; the circulation fan 3 is a power device for forced circulation of hot air inside the equipment, and is connected to one end of the overheating heat exchange device 14 and the other end is connected to the low-temperature air main pipeline 5; a waste heat recovery heat exchange device 15, one end of which is connected to the steam-water separation device 13 through a separation water pipeline 13-2, and the other end is connected to the preheating heat exchange device 2 through a waste heat recovery pipeline 15-2; the steam-water separation device 13 is provided with three connection ports, the first port is connected to the saturated heat exchange device 12 through a wet steam pipeline 12-1, the second port is connected to the overheating heat exchange device 14 through a dry steam pipeline 13-1, and the third port is connected to the steam-water separation device 13 through a separation water pipeline 13-2.

[0028] In this embodiment, an independent heat exchange monitoring and control system for a solid electric thermal storage furnace is constructed by connecting the heat exchange devices of multiple solid electric thermal storage furnaces in series to form an output structure, which is then configured as an independent heat exchange monitoring and control system. This system structure includes a preheating stage thermal storage boiler, a saturation stage thermal storage boiler, a superheating stage thermal storage boiler, a steam-water separation device 13, a waste heat recovery and heat exchange device 15, and a control system 6. The solid thermal storage bodies 1 in the preheating stage, saturation stage, and superheating stage thermal storage boilers convert high-voltage electrical energy into heat energy, which is stored within the solid thermal storage bodies 1. A circulating fan 3 distributes low-temperature air through a low-temperature air main duct 5 to n (n ≥ 1) groups of low-temperature air branch ducts 9. Air volume detection devices 10 and air volume control devices 11 installed on each low-temperature air branch duct 9 ensure uniform air volume in each low-temperature air branch duct 9, thereby ensuring uniform heat energy release from the solid thermal storage bodies 1. After the low-temperature air enters the solid heat storage body 1, it is heated by the internal heat energy and becomes high-temperature air, and then collected into the high-temperature air main pipe 4 by n (n≥1) groups of high-temperature air branch pipes 7, wherein the wind temperature detection device 8 provided on the high-temperature air branch pipe 7 can realize the detection of the air temperature. The high-temperature air heated by the solid heat storage body 1 enters the shell side of each heat exchange device in the preheating section heat storage boiler, the saturation section heat storage boiler, and the superheating section heat storage boiler for heat energy exchange according to the needs of the heat exchange device. Finally, the low-temperature air after the heat energy carried by the high-temperature air is replaced is sent back to the low-temperature air main pipe for the next circulation through the circulating fan 3. The reciprocating cycle realizes the release of heat energy of each heat storage boiler. While the heat energy of each heat storage boiler is being released, the pipe side of each heat exchange device is simultaneously outputting heat medium, and the feed water enters the waste heat recovery heat exchange device 15 through the water feed pipe 15-1 for partial heat energy recovery, and then enters the preheating heat exchange device 2 through the preheating recovery pipe 15-2. The pipe-side portion is heated to a preheated water state through heat exchange, and the preheated water enters the pipe-side portion of the saturated heat exchange device 12 through the preheated water pipe 2-1 for heat exchange and heating to a wet steam state. The wet steam enters the steam-water separation device 13 through the wet steam pipe for steam-water separation, and the separated dry saturated steam is sent to the pipe-side portion of the superheat heat exchange device 14 through the dry steam pipe for heat exchange and heating to a superheated steam state, and is delivered to the user through the superheated steam pipe 14-1. Among them, the hot water separated by the steam-water separation device 13 is delivered to the waste heat recovery heat exchange device 15 through the separation water pipe 13-2 for partial heat energy recovery, and the separated hot water after the heat energy is absorbed by the feed water is discharged through the drain pipe 15-3.

[0029] In this embodiment, the solid electric heat storage furnace can also be configured to integrate the preheating section heat storage boiler, the saturated section heat storage boiler, and the superheating section heat storage boiler together, that is, the preheating heat exchange device 2, the saturated heat exchange device 12 and the superheating heat exchange device 14 are combined into a heat exchange device, or the preheating heat exchange device 2 and the saturated heat exchange device 12 are combined into a heat exchange device, and the preheating heat exchange device 2 and the superheating heat exchange device 14 are combined into a heat exchange device, and then used in series mode, and configured with a corresponding circulating fan, and combined with the solid heat storage body 1 to form a solid electric heat storage furnace or two solid electric heat storage furnaces to achieve output on the user side.

[0030] In this embodiment, Figure 2 As shown, the control system 6 adjusts the frequency of the circulating fan 3 by changing the steam temperature and pressure, and fine-tunes the steam dryness in the wet steam pipe 12-1; in the initial stage, the opening of each air volume control device 11 is opened to 100%, and the air volume in the low-temperature air branch pipe 9 is collected in real time by the corresponding air volume detection device 10 and the average value is taken, and the average value is used as the control reference value. It should be noted that this value is in a state of real-time dynamic change during the subsequent adjustment process; the air volume allowable deviation range is set as: ±1%, and then the air volume control device 11 corresponding to the air volume greater than 1% of the control reference value is reduced in opening control so that the air volume deviation is within the range of +1%. For multiple air volumes greater than 1% of the control reference value, in order to avoid oscillation caused by excessive influence on the control reference value during mutual adjustment, they are adjusted one by one according to the deviation from large to small; the air volume control device 11 corresponding to the air volume less than 1% of the control reference value is adjusted. The control device 11 increases the opening control so that the air volume deviation is within the range of -1%. For multiple air volumes less than 1% of the control reference value, similarly, in order to avoid oscillation, they are adjusted one by one according to the deviation from large to small. During the adjustment process, if the opening of the air volume control device 11 has reached 100% and the air volume is still less than 1% of the control reference value at this time, an alarm message of abnormal air volume is given; the air temperature in the high-temperature air branch duct is collected in real time by the air temperature detection device 8 and the average value is taken, and the allowable over-temperature range of the air temperature is set, such as: +3%. The opening control of the air volume control device 11 corresponding to the over-temperature of 3% is increased. By increasing the air volume, the local overheating of the solid heat storage body 1 is quickly released, and the overall temperature of the solid heat storage body 1 is averaged. After the air temperature drops to the allowable range, the opening of the air volume control device 11 is restored to the original value. During the adjustment, if the opening of the air volume control device 11 is already at 100%, an abnormal air temperature alarm is given.

[0031] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0032] Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. An external independent heat exchange detection and control system for a solid electric heat storage furnace, characterized in that: The invention comprises a preheating section heat storage boiler, a saturation section heat storage boiler, a superheating section heat storage boiler, a steam-water separation device (13), a waste heat recovery heat exchange device (15) and a control system (6). The preheating section heat storage boiler, the saturation section heat storage boiler, the superheating section heat storage boiler, the steam-water separation device (13) and the waste heat recovery heat exchange device (15) are connected in series through a pipeline. The preheating section heat storage boiler, the saturation section heat storage boiler and the superheating section heat storage boiler are all connected to a solid heat storage body (1) that can convert electrical energy into heat energy and store it. The control system (6) controls and adjusts the uniform release of heat energy of each solid heat storage body (1) through an air temperature detection device (8), an air volume detection device (10) and an air volume control device (11) connected to each solid heat storage body (1).

2. The external independent heat exchange detection and control system for a solid electric thermal storage furnace according to claim 1 is characterized in that: One end of the solid heat storage body (1) located in the preheating section heat storage boiler is collected into the high-temperature air main pipe (4) through at least one group of high-temperature air branch pipes (7) and connected to the preheating heat exchange device (2); one end of the preheating heat exchange device (2) is collected into the low-temperature air main pipe (5) through the circulating fan (3) through at least one group of low-temperature air branch pipes (9) and connected to the other end of the solid heat storage body (1).

3. The external independent heat exchange detection and control system for a solid electric thermal storage furnace according to claim 1 is characterized in that: One end of the solid heat storage body (1) located in the saturated section heat storage boiler is collected into the high-temperature air main pipe (4) through at least one group of high-temperature air branch pipes (7) and connected to the saturated heat exchange device (12); one end of the saturated heat exchange device (12) is collected into the low-temperature air main pipe (5) through the circulating fan (3) through at least one group of low-temperature air branch pipes (9) and connected to the other end of the solid heat storage body (1).

4. The external independent heat exchange detection and control system for a solid electric thermal storage furnace according to claim 1 is characterized in that: One end of the solid heat storage body (1) located in the superheating section heat storage boiler is collected into the high-temperature air main pipe (4) through at least one group of high-temperature air branch pipes (7) and connected to the superheat heat exchange device (14); one end of the superheat heat exchange device (14) is collected into the low-temperature air main pipe (5) through the circulating fan (3) through at least one group of low-temperature air branch pipes (9) and connected to the other end of the solid heat storage body (1).

5. The external independent heat exchange detection and control system for a solid electric heat storage furnace according to claim 2 is characterized in that: The preheating heat exchange device (2) is a shell and tube heat exchanger, the shell side inlet of which is connected to the high-temperature air main pipeline (4), the shell side outlet is connected to the circulating fan (3), the tube side inlet is connected to the waste heat recovery heat exchange device (15) through the waste heat recovery pipeline (15-2), and the tube side outlet is connected to the saturation section heat storage boiler through the preheated water pipe (2-1).

6. The external independent heat exchange detection and control system for a solid electric thermal storage furnace according to claim 3 is characterized in that: The saturated heat exchange device (12) is a shell and tube heat exchanger, the shell side inlet of which is connected to the high-temperature air main pipe (4), the shell side outlet is connected to the circulating fan (3), the tube side inlet is connected to the preheating section heat storage boiler through the preheating water pipe (2-1), and the tube side outlet is connected to the steam-water separation device (13) through the wet steam pipe (12-1).

7. The external independent heat exchange detection and control system for a solid electric thermal storage furnace according to claim 4 is characterized in that: The superheat heat exchange device (14) is a shell and tube heat exchanger, the shell side inlet of which is connected to the high-temperature air main pipeline (4), the shell side outlet is connected to the circulation fan (3), the tube side inlet is connected to the steam-water separation device (13) through the dry steam pipeline (13-1), and the tube side outlet is connected to the superheated steam pipeline (14-1).

8. The external independent heat exchange detection and control system for a solid electric thermal storage furnace according to claim 6 or 7, characterized in that: The steam-water separation device (13) is provided with three connection ports, the first port being connected to the saturated heat exchange device (12) via a wet steam pipe (12-1), the second port being connected to the superheat heat exchange device (14) via a dry steam pipe (13-1), and the third port being connected to the waste heat recovery heat exchange device (15) via a separation water pipe (13-2).

9. The external independent heat exchange detection and control system for a solid electric thermal storage furnace according to claim 8, characterized in that: One end of the steam-water separation device (13) is connected to the steam-water separation device (13) via a separation water pipeline (13-2), and the other end is connected to the preheating heat exchange device via a waste heat recovery pipeline (15-2).

10. An external independent heat exchange detection and control system for a solid electric thermal storage furnace according to any one of claims 2 to 7, characterized in that: The control system (6) comprises: An air temperature detection device (8) is provided on the high-temperature air branch pipe (7) and is connected to the high-temperature air branch pipe (7); An air volume detection device (10) is provided on the low-temperature air branch pipe (9) and is connected to the low-temperature air branch pipe (9); An air volume control device (11) is provided on the low-temperature air branch pipe (9) and is connected to the low-temperature air branch pipe (9); The air volume detection device (10) is used to collect the real-time air intake volume and balance the air volume on each low-temperature air branch pipe (9) through the air volume control device (11) so that the air volume is at the maximum value that can be achieved. When the air temperature detection device (8) detects that the local air temperature is too high and the opening of the corresponding air volume control device (11) does not reach 100%, the air volume control device (11) increases the opening to increase the air volume.

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