Heat exchanger and heat storage combustion system

Abstract

The utility model discloses a heat exchanger, which relates to the technical field of molten aluminum refining, and comprises a joint valve, a first heat storage box and a second heat storage box, the joint valve is provided with a first interface, a second interface, a third interface and a fourth interface which are mutually communicated, the first interface and the third interface are oppositely arranged, and the second interface and the fourth interface are oppositely arranged; the first interface is communicated with a high-temperature flue gas pipeline, the third interface is communicated with the burner, the second interface is communicated with the first heat storage tank, the fourth interface is communicated with the second heat storage tank, a cut-off piece is arranged in the joint valve, and in a first state, the cut-off piece is used for communicating the first interface with the second interface and communicating the third interface with the fourth interface; in the second state, the cut-off piece enables the first connector to be communicated with the fourth connector and enables the second connector to be communicated with the third connector. The utility model further discloses a heat storage combustion system which comprises the heat exchanger. According to the utility model, heat exchange can be realized, gas in the burner is not reversed, the furnace pressure is stable, and the service life is long.

Description

Technical Field

[0001] This utility model relates to the field of aluminum refining technology, and in particular to a heat exchanger and a regenerative combustion system. Background Technology

[0002] Regenerative high-temperature air combustion (HTAC) is a novel combustion technology that emerged in the late 1980s. It organically combines waste heat recovery with high-efficiency combustion and NO reduction technologies, thus achieving the dual goals of energy conservation and NO emission reduction. With advancements in equipment and materials, HTAC has been widely applied in metallurgical enterprises. However, while possessing enormous energy-saving potential, this technology also has some inherent problems.

[0003] For example, in the non-ferrous metallurgical industry, aluminum melting furnaces experience extreme temperature fluctuations due to their process characteristics. Traditionally, reversible combustion technology is used, where burners operate in pairs, with each burner alternating between combustion and flue gas exhaust. During combustion, air passes through a regenerator connected to that burner, preheating the air. After a period, the heat in this regenerator is depleted. The other burner draws the high-temperature flue gas back into the regenerator, reheating the regenerator connected to the burner, and this cycle repeats, ensuring the burners use preheated air. This constant switching between combustion and flue gas exhaust inevitably causes furnace pressure fluctuations, and frequent reversals easily damage the regulating valves. Failures in the reversing equipment can cause the combustion system to malfunction, directly impacting production and posing safety hazards. While intermittent reversible burners can reduce the reversing frequency, intermittent reversing places higher demands on the reversing components, effectively increasing investment in the reversing section. Furthermore, the reversing process still occurs, and the aforementioned problems persist. Therefore, a heat exchanger and regenerative combustion system are urgently needed to solve these technical problems. Utility Model Content

[0004] The purpose of this invention is to provide a heat exchanger and a regenerative combustion system to solve the problems existing in the prior art. It can achieve heat exchange without reversing the gas direction in the burner, resulting in stable furnace pressure and long service life.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides a heat exchanger, including a connector valve, a first heat storage box, and a second heat storage box. The connector valve includes a valve body and a shut-off element. The valve body has a shut-off cavity inside, and the valve body is provided with a first interface, a second interface, a third interface, and a fourth interface, all communicating with the shut-off cavity. The first interface is used to communicate with a high-temperature flue gas pipeline, the third interface is used to communicate with a preheated air exhaust pipeline connected to a burner, the second interface is used to communicate with the first heat storage box, and the fourth interface is used to communicate with the second heat storage box. The shut-off element is disposed within the shut-off cavity. The connector valve has a first state and a second state. The rotation of the shut-off component allows the connector valve to change from the first state to the second state. When the connector valve is in the first state, the first interface and the second interface are connected to the airflow direction, and the third interface and the fourth interface are connected to the airflow direction. When the connector valve is in the second state, the first interface and the fourth interface are connected to the airflow direction, and the second interface and the third interface are connected to the airflow direction. Both the first heat storage box and the second heat storage box are also connected to an air pipeline. The air pipeline can supply combustion air to the first heat storage box and the second heat storage box, and discharge the flue gas after heat exchange is completed.

[0007] In some embodiments, a driving component is also included. The connector valve also includes a valve cover, and the shut-off component is a valve plate. The valve cover can be closed with the valve body. The middle part of the valve plate is rotatably disposed on the valve cover. The driving component is disposed on the valve cover and connected to the valve plate, and can drive the valve plate to rotate.

[0008] In some embodiments, the first interface is disposed opposite to the third interface, and the second interface is disposed opposite to the fourth interface. When the connector valve is in a first state, the two ends of the shut-off member abut against the lower edge of the second interface and the upper edge of the fourth interface, respectively. The first interface is connected to the second interface, and the third interface is connected to the fourth interface. When the connector valve is in a second state, the two ends of the shut-off member abut against the upper edge of the second interface and the lower edge of the fourth interface, respectively. The first interface is connected to the fourth interface, and the second interface is connected to the third interface.

[0009] In some embodiments, the air duct includes an air inlet pipe, an air outlet pipe, and a first pipe and a second pipe connected in parallel. Both ends of the first pipe and the second pipe are respectively connected to the air inlet pipe and the air outlet pipe. The air inlet pipe is connected to a blower, and the air outlet pipe is connected to an induced draft fan. The middle part of the first pipe is connected to the first heat storage box, and a first valve and a second valve are respectively provided on both sides of the connection between the first pipe and the first heat storage box. The middle part of the second pipe is connected to the second heat storage box, and a third valve and a fourth valve are respectively provided on both sides of the connection between the second pipe and the second heat storage box.

[0010] In some embodiments, both the first heat storage box and the second heat storage box include an upper box, a middle box, and a lower box arranged and connected from top to bottom. The upper box of the first heat storage box is used to communicate with the second interface, the lower box of the first heat storage box is used to communicate with the first pipeline, the upper box of the second heat storage box is used to communicate with the fourth interface, and the lower box of the second heat storage box is used to communicate with the second pipeline.

[0011] In some embodiments, the upper body of both the first and second heat storage boxes is provided with a ball-filling gate for filling heat storage balls, and the middle body of both the first and second heat storage boxes is provided with a ball-discharging gate for discharging heat storage balls. A steel support net is also provided between the middle body and the lower body.

[0012] In some embodiments, both the first and second heat storage tanks are provided with rollers at their bottoms.

[0013] In some embodiments, the first and second heat storage tanks are connected to the connector valve via flanges. Each of the first and second heat storage tanks has a first flange and multiple movable clips. The connector valve has a second flange. Both the first and second flanges have slots. Each movable clip includes a fixed seat, a screw, and a locking nut. The fixed seat is fixedly connected to the first flange. The first end of the screw is rotatably connected to the fixed seat, and the second end of the screw is connected to the locking nut. Rotating the screw allows it to enter the slots on both the first and second flanges. Tightening the locking nut presses the second flange against the first flange.

[0014] In some embodiments, the movable buckle further includes a rotating shaft and a handwheel, the fixed base includes two fixing plates, the two fixing plates are respectively fixedly disposed on both sides of the groove on the first flange, the rotating shaft is rotatably disposed on the fixed base, the screw can pass through the rotating shaft and be fixedly connected, the handwheel is fixedly connected to the locking nut, and the locking nut is threadedly connected to the screw.

[0015] This utility model also provides a regenerative combustion system, including the heat exchanger described above.

[0016] The present invention achieves the following technical advantages over the prior art:

[0017] The heat exchanger provided by this utility model has its first and third interfaces arranged opposite each other, and its second and fourth interfaces arranged opposite each other. The first interface is used to connect to a high-temperature flue gas pipeline, the third interface is used to connect to a preheated air discharge pipeline connected to the burner, the second interface is used to connect to a first heat storage tank, and the fourth interface is used to connect to a second heat storage tank. The connector valve also has a shut-off component. When the connector valve is in the first state, the first and second interfaces are connected in the airflow direction, and the third and fourth interfaces are connected in the airflow direction. At this time, high-temperature flue gas enters from the first interface and then enters the first heat storage tank through the third interface, allowing the first heat storage tank to store heat. Simultaneously, because the third and fourth interfaces are connected, the combustion air enters the second heat storage tank, passes through the fourth and third interfaces in sequence, and then enters the burner. The heat stored in the second heat storage tank heats the combustion air. When the connector valve is in the second state... The first and fourth interfaces are connected to the airflow direction, as are the second and third interfaces. Both the first and second heat storage boxes are also connected to air pipelines. The air pipelines can supply combustion air to the first and second heat storage boxes and discharge the flue gas after heat exchange. At this time, the high-temperature flue gas enters from the first interface and enters the second heat storage box through the fourth interface, allowing the second heat storage box to store heat. Meanwhile, since the third and second interfaces are connected, the combustion air enters the first heat storage box, absorbs heat, and then enters the burner after passing through the second and third interfaces in sequence. It can be seen that the third interface is always used to transfer the heated combustion air to the burner. The burner also always receives the combustion air from one direction and then discharges the combustion air (combustion) from the other direction. The burner does not have to undertake the dual tasks of recovering high-temperature flue gas and combustion, achieving heat exchange without reversing direction, resulting in stable furnace pressure and long service life. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the heat exchanger structure in some embodiments of the present invention;

[0020] Figure 2 This is a schematic diagram of the connector valve in its first state.

[0021] Figure 3 This is a schematic diagram of the connector valve in its second state.

[0022] Figure 4 This is a schematic diagram of the structure of the first or second heat storage box in some embodiments of this utility model;

[0023] Figure 5 This is a schematic diagram of the air duct structure in some embodiments of this utility model.

[0024] In the diagram: 1-Connector valve; 101-First interface; 102-Second interface; 103-Third interface; 104-Fourth interface; 105-Valve body; 106-Stop component; 2-First heat storage box; 3-Second heat storage box; 4-Connector; 5-High-temperature flue gas pipeline; 6-Preheated air exhaust pipeline; 7-Air pipeline; 8-Blower; 9-Exhaust fan; 10-Exhaust gas exhaust pipeline; 11-Support; 12-Bend; 13-First flange; 14-Upper housing; 141-Goal mount; 15-Middle housing; 151-Volleyball goal; 16-Lower housing; 17-Roller; 18-Rail; 19-Inlet pipe; 20-Outlet pipe; 21-First pipeline; 211-First valve; 212-Second valve; 22-Second pipeline; 221-Third valve; 222-Fourth valve. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The purpose of this invention is to provide a heat exchanger and a regenerative combustion system to solve the problems existing in the prior art. It can achieve heat exchange without reversing the gas direction in the burner, resulting in stable furnace pressure and long service life.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] like Figures 1-5 As shown, this utility model provides a heat exchanger, including a connector valve 1, a first heat storage tank 2, and a second heat storage tank 3. The connector valve includes a valve body and a shut-off element 106. The valve body has a shut-off cavity inside, and the valve body is provided with a first interface 101, a second interface 102, a third interface 103, and a fourth interface 104, all of which are connected to the shut-off cavity. The first interface 101 is used to connect to a high-temperature flue gas pipeline 5, the third interface 103 is used to connect to a preheated air exhaust pipeline 6 connected to the burner, the second interface 102 is used to connect to the first heat storage tank 2, and the fourth interface 104 is used to connect to the second heat storage tank 3. The shut-off element 106 is disposed in the shut-off cavity. The connector valve 1 has a first state and a second state. Rotation of the shut-off element 106 can change the connector valve 1 from the first state to the second state. When the connector valve 1 is in the first state, the first port 101 and the second port 102 are connected to the air flow direction, and the third port 103 and the fourth port 104 are connected to the air flow direction. At this time, high-temperature flue gas enters from the first port 101 and enters the first heat storage box 2 through the third port 103, so that the first heat storage box 2 stores heat. At the same time, since the third port 103 and the fourth port 104 are connected, combustion air enters the second heat storage box 2. After passing through the fourth port 104 and the third port 103, the heat from the second heat storage box 3 enters the burner. The heat stored in the second heat storage box 3 heats the combustion air. When the connector valve 1 is in the second state, the first port 101 and the fourth port 104 are connected to the air flow direction, and the second port 102 and the third port 103 are connected to the air flow direction. Both the first heat storage box 2 and the second heat storage box 3 are also connected to the air pipeline. The air pipeline can introduce combustion air into the first heat storage box 2 and the second heat storage box 3, and discharge the flue gas after heat exchange. At this time, the high-temperature flue gas enters from the first port 101 and passes through the fourth port 104 and the third port 103. The heat is introduced into the second heat storage box 3 through port 104, allowing the second heat storage box 3 to store heat. Simultaneously, because the third port 103 is connected to the second port 102, the combustion air enters the first heat storage box 2, absorbs heat, and then passes through the second port 102 and the third port 103 before entering the burner. It is evident that the third port 103 is always used to transfer heated combustion air to the burner. The burner also always receives combustion air from one direction and then discharges it from the other direction (combustion). The burner does not need to undertake the dual tasks of recovering high-temperature flue gas and combustion, achieving heat exchange without reversing direction, resulting in stable furnace pressure and a long service life. Furthermore, the burners no longer need to work in pairs, reducing the total number of burners required.

[0030] In a preferred embodiment, the first interface 101 and the third interface 103 are arranged opposite to each other, and the second interface 102 and the fourth interface 104 are arranged opposite to each other. When the connector valve 1 is in the first state, the two ends of the shut-off member 106 abut against the lower edge of the second interface 102 and the upper edge of the fourth interface 104, respectively. When the connector valve 1 is in the second state, the two ends of the shut-off member 106 abut against the upper edge of the second interface 102 and the lower edge of the fourth interface 104, respectively. The end of the shut-off member 106 can abut against the edge of the interface. The fit between the shut-off member 106 and the edge is conducive to the interception of the flow by the shut-off member 106 and reduces the risk of air leakage.

[0031] It should be noted that the high-temperature flue gas pipeline 5 has a metal exterior and is lined with high-temperature resistant materials internally, and is used to introduce the high-temperature flue gas generated by the melting furnace into the connector valve 1; the preheated air exhaust pipeline 6 has a metal exterior and is lined with high-temperature resistant materials internally, and is used to introduce the preheated combustion air into the burner. Both the high-temperature flue gas pipeline 5 and the preheated air exhaust pipeline 6 are connected to the connector valve 1 via connector 4.

[0032] In a preferred embodiment, the heat exchanger also includes a support 11, on which the connector valve 1 is mounted. The support 11 provides reliable support for the connector valve 1, ensuring its stability during operation. When the heat exchanger is working, the connector valve 1 is subjected to airflow pressure and other forces. The support 11 effectively disperses these external forces, preventing displacement or shaking of the connector valve 1, ensuring the stability of the entire heat exchanger system, and reducing the risk of failure due to component instability.

[0033] In some embodiments, the valve also includes a drive element, and the connector valve 1 further includes a valve cover. The shut-off element 106 is a valve plate, which can be closed to the valve body 105. The center of the valve plate is rotatably mounted on the valve cover. The drive element is mounted on the valve cover and connected to the valve plate, and can drive the valve plate to rotate. The design of the valve plate being rotatably mounted on the valve cover and being able to drive the valve plate to rotate, in conjunction with the drive element, allows the valve plate to be flexibly switched between different positions. This facilitates the switching of the internal air path of the connector valve 1, meeting the air path connectivity requirements of the heat exchanger under different operating conditions (first state and second state), thereby achieving a highly efficient heat exchange process. Moreover, when the valve plate needs to be repaired or replaced due to wear in the future, the valve cover can be removed for operation, without the need to replace the entire connector valve 1.

[0034] In a preferred embodiment, the valve body 105 is also equipped with multiple position sensors. Each position sensor has two contacts respectively disposed on the valve plate and the valve body 105. When the valve plate abuts against the interface, the two contacts sense each other, indicating that the valve plate has reached its designated position. Furthermore, the length of the valve plate is greater than the distance between any two interfaces, allowing the valve body 105 at the interface to limit the maximum deflection angle of the valve plate and prevent excessive deflection.

[0035] In some embodiments, the combustion air supply device includes an air pipe 7, which is connected to the first heat storage box 2 and the second heat storage box 3. The air pipe 7 can supply combustion air to the first heat storage box 2 and the second heat storage box 3, and can also extract the flue gas after heat exchange. The air pipe 7 includes an inlet pipe 19, an outlet pipe 20, and a first pipe 21 and a second pipe 22 connected in parallel. Both ends of the first pipe 21 and the second pipe 22 are connected to the inlet pipe 19 and the outlet pipe 20, respectively. The inlet pipe 19 is connected to a blower 8, and the outlet pipe 20 is connected to an induced draft fan 9. The middle section of the first pipe 21 is connected to the first heat storage box 2, and a first valve 211 and a second valve 212 are respectively provided on both sides of the connection between the first pipe 21 and the first heat storage box 2. The middle section of the second pipe 22 is connected to the second heat storage box 3, and a third valve 221 and a fourth valve 222 are respectively provided on both sides of the connection between the second pipe 22 and the second heat storage box 3. The four valves are automatically controlled by the electronic control system and work in coordination with the valve plate of the connector valve 1. That is, all four valves and the drive components are controlled by the same electronic control system. When the first valve 211 and the fourth valve 222 are open, and the second valve 212 and the third valve 221 are closed, ambient temperature air is blown into the intake pipe 19 by the blower 8. After passing through the first valve 211, it enters the first heat storage box 2 for preheating (at this time, the valve plate abuts against the lower edge of the second interface 102 and the upper edge of the fourth interface 104, and the first interface 101 and the second interface 102 are connected). The high-temperature flue gas heats the heat storage medium in the second heat storage box 3 and then enters the second pipeline 22, passing through the fourth valve 22. After passing through the exhaust pipe 20, the air enters the induced draft fan 9 and is discharged into the dust collection device. When the first valve 211 and the fourth valve 222 are closed, and the second valve 212 and the third valve 221 are open, the ambient temperature air is blown into the intake pipe 19 by the blower 8, passes through the third valve 221, and then enters the second heat storage box 3 for preheating (at this time, the valve plate abuts against the upper edge of the second interface 102 and the lower edge of the fourth interface 104, and the first interface 101 and the fourth interface 104 are connected). After the high temperature flue gas heats the heat storage body in the first heat storage box 2, it enters the first pipeline 21, passes through the second valve 212, and then enters the induced draft fan 9 through the exhaust pipe 20 and is discharged into the dust collection device.

[0036] In some embodiments, both the first heat storage box 2 and the second heat storage box 3 include an upper box 14, a middle box 15, and a lower box 16 arranged and connected from top to bottom. The upper box 14 of the first heat storage box 2 is used to communicate with the second interface 102, preferably through a bend pipe 12. The lower box 16 of the first heat storage box 2 is used to communicate with the first pipeline 21. The upper box 14 of the second heat storage box 3 is used to communicate with the fourth interface 104, preferably through a bend pipe 12. The lower box 16 of the second heat storage box 3 is used to communicate with the second pipeline 22. The lower box 16 is used to allow the entry of ambient temperature combustion air. The upper box 14 is connected to the heat storage box, enabling the combustion air to move upwards and fully absorb the heat stored in the heat storage body within the heat storage box.

[0037] In some embodiments, the upper chamber 14 of both the first heat storage box 2 and the second heat storage box 3 is provided with a ball-loading gate 141 for filling heat storage balls, and the middle chamber 15 of both the first heat storage box 2 and the second heat storage box 3 is provided with a volleyball gate 151 for discharging heat storage balls. Furthermore, a steel support net is provided between the middle chamber 15 and the lower chamber 16 to support the heat storage balls, prevent them from falling into the lower chamber 16, prevent blockage of the internal channels of the lower chamber 16, and ensure smooth flow of combustion air and flue gas. Moreover, with the ball-loading gate 141 located in the upper chamber 14 and the volleyball gate 151 located in the middle chamber 15, the volleyball gates are closed during filling, and the heat storage balls are filled through the ball-loading gate 141, making it easier for the heat storage balls to accumulate and form, easier to fill the heat storage box, and similarly easier to discharge them from the heat storage box.

[0038] In some embodiments, both the bottom of the first heat storage box 2 and the second heat storage box 3 are provided with rollers 17, and the placement surface of the heat storage box is provided with a track 18. The rollers 17 are located within the track 18 and can only move along the track 18. The heat storage box with rollers 17 can be easily switched, and no machine handling is required. It can be quickly moved closer to or away from the connector valve 1 by manual pushing.

[0039] In some embodiments, the first heat storage tank 2 and the second heat storage tank 3 are both connected to the connector valve 1 via flanges. Both the first heat storage tank 2 and the second heat storage tank 3 are provided with a first flange 13 and a movable buckle, with multiple movable buckles arranged circumferentially around the first flange 13. The connector valve 1 is provided with a second flange. Both the first flange 13 and the second flange have grooves. The movable buckle includes a fixed seat, a screw, and a locking nut. The fixed seat is fixedly connected to the first flange 13. The first end of the screw is rotatably connected to the fixed seat, and the second end of the screw is connected to the locking nut. Rotating the screw allows it to enter the groove on the first flange 13 and the groove on the second flange. Tightening the locking nut presses the second flange against the first flange 13.

[0040] Furthermore, the movable buckle also includes a rotating shaft and a handwheel. The fixed base includes two fixing plates, which are respectively fixed to both sides of the groove on the first flange 13. The rotating shaft is rotatably mounted on the fixed base, and the screw can pass through the rotating shaft and be fixedly connected. The handwheel is fixedly connected to the locking nut, and the locking nut is threadedly connected to the screw. The screw and handwheel can rotate around the rotating shaft. When the first flange 13 and the second flange need to be locked, simply rotate the screw around the rotating shaft into the groove, and then rotate the handwheel. The handwheel drives the nut to rotate, thus locking the first flange 13 and the second flange. The structural design of the movable buckle makes the installation and disassembly process simpler. The combination of the fixed base, rotating shaft, screw, handwheel, and nut allows the screw to be tightened and loosened simply by rotating the handwheel, without the need for complicated tools and operating procedures. During equipment maintenance and repair, the heat storage tank can be quickly separated and connected to the connector valve 1, saving time and labor costs and improving work efficiency. Moreover, the groove has higher tolerance for error. Compared with two flanges directly set with round holes and then connected by bolts, it can tolerate a greater error and makes it more convenient to replace the heat storage box.

[0041] In some embodiments, the heat exchanger further includes a dust collection device, which is connected to the outlet of the induced draft fan 9 via an exhaust gas discharge pipe 10. After the exhaust gas is treated by the dust collection device, the concentration of dust emissions is reduced, thus meeting environmental protection requirements and reducing pollution to the surrounding environment.

[0042] Example 2

[0043] This embodiment also provides a regenerative combustion system, including the heat exchanger in Embodiment 1, which can achieve heat exchange without reversing, resulting in stable furnace pressure and long service life.

[0044] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A heat exchanger, characterized in that: The system includes a connector valve, a first heat storage tank, and a second heat storage tank. The connector valve comprises a valve body and a shut-off element. The valve body has a shut-off cavity inside and is provided with a first interface, a second interface, a third interface, and a fourth interface, all of which communicate with the shut-off cavity. The first interface is used to communicate with a high-temperature flue gas pipeline, the third interface is used to communicate with a preheated air exhaust pipeline connected to a burner, the second interface is used to communicate with the first heat storage tank, and the fourth interface is used to communicate with the second heat storage tank. The shut-off element is disposed within the shut-off cavity. The connector valve has a first state and a second state, and the shut-off element has rotational energy... The valve is capable of changing from the first state to the second state. When the valve is in the first state, the first interface and the second interface are connected to the airflow direction, and the third interface and the fourth interface are connected to the airflow direction. When the valve is in the second state, the first interface and the fourth interface are connected to the airflow direction, and the second interface and the third interface are connected to the airflow direction. Both the first heat storage box and the second heat storage box are also connected to the air pipeline. The air pipeline can introduce combustion air into the first heat storage box and the second heat storage box, and discharge the flue gas after heat exchange is completed.

2. The heat exchanger according to claim 1, characterized in that: It also includes a driving component, the connector valve also includes a valve cover, the shut-off component is a valve plate, the valve cover can cover the valve body, the middle part of the valve plate is rotatably disposed on the valve cover, the driving component is disposed on the valve cover and connected to the valve plate, and can drive the valve plate to rotate.

3. The heat exchanger according to claim 1, characterized in that: The first interface is positioned opposite to the third interface, and the second interface is positioned opposite to the fourth interface. When the connector valve is in the first state, the two ends of the shut-off member abut against the lower edge of the second interface and the upper edge of the fourth interface, respectively. The first interface is connected to the second interface, and the third interface is connected to the fourth interface. When the connector valve is in the second state, the two ends of the shut-off member abut against the upper edge of the second interface and the lower edge of the fourth interface, respectively. The first interface is connected to the fourth interface, and the second interface is connected to the third interface.

4. The heat exchanger according to claim 3, characterized in that: The air duct includes an air inlet pipe, an air outlet pipe, and a first pipe and a second pipe connected in parallel. Both ends of the first pipe and the second pipe are connected to the air inlet pipe and the air outlet pipe, respectively. The air inlet pipe is connected to a blower, and the air outlet pipe is connected to an induced draft fan. The middle part of the first pipe is connected to the first heat storage box, and a first valve and a second valve are respectively provided on both sides of the connection between the first pipe and the first heat storage box. The middle part of the second pipe is connected to the second heat storage box, and a third valve and a fourth valve are respectively provided on both sides of the connection between the second pipe and the second heat storage box.

5. The heat exchanger according to claim 4, characterized in that: Both the first heat storage box and the second heat storage box include an upper box, a middle box and a lower box arranged and connected from top to bottom. The upper box of the first heat storage box is used to communicate with the second interface, the lower box of the first heat storage box is used to communicate with the first pipeline, the upper box of the second heat storage box is used to communicate with the fourth interface, and the lower box of the second heat storage box is used to communicate with the second pipeline.

6. The heat exchanger according to claim 5, characterized in that: Both the first and second heat storage boxes are equipped with ball-filling gates on their upper bodies for filling heat storage balls, and both the first and second heat storage boxes are equipped with ball-discharging gates on their middle bodies for discharging heat storage balls. A steel support net is also provided between the middle body and the lower body.

7. The heat exchanger according to claim 1, characterized in that: Both the first and second heat storage boxes are equipped with rollers at their bottoms.

8. The heat exchanger according to claim 1, characterized in that: Both the first and second heat storage tanks are connected to the connector valve via flanges. Each of the first and second heat storage tanks has a first flange and multiple movable clips. The connector valve has a second flange. Both the first and second flanges have slots. Each movable clip includes a fixed seat, a screw, and a locking nut. The fixed seat is fixedly connected to the first flange. The first end of the screw is rotatably connected to the fixed seat, and the second end of the screw is connected to the locking nut. Rotating the screw allows it to enter the slots on both the first and second flanges. Tightening the locking nut presses the second flange against the first flange.

9. The heat exchanger according to claim 8, characterized in that: The movable buckle also includes a rotating shaft and a handwheel. The fixed base includes two fixing plates, which are respectively fixedly disposed on both sides of the groove on the first flange. The rotating shaft is rotatably disposed on the fixed base. The screw can pass through the rotating shaft and be fixedly connected. The handwheel is fixedly connected to the locking nut, and the locking nut is threadedly connected to the screw.

10. A regenerative combustion system, characterized in that: Including the heat exchanger as described in any one of claims 1-9.

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