Waste heat flue gas efficient utilization device for pyrolysis carbonization rotary furnace

Abstract

The invention discloses a waste heat flue gas efficient utilization device for a pyrolysis carbonization rotary furnace, and belongs to the technical field of waste heat flue gas utilization, the waste heat flue gas efficient utilization device comprises a condensing device, the condensing device comprises a high-temperature heat storage chamber, a waterway pipeline is arranged on the lower side of the high-temperature heat storage chamber, and a safety valve is arranged on the waterway pipeline; the outer side of the high-temperature heat storage chamber is connected with a first thermocouple and a second thermocouple, the inner side of the high-temperature heat storage chamber is provided with heat preservation cotton, the middle position of the inner side of the high-temperature heat storage chamber is connected with a condensation pipeline, and 60%-70% of high-temperature waste heat flue gas which is not utilized by a host machine in the pyrolysis carbonization process is introduced into the water-cooled horizontal condensation device through an induced draft fan; the system effectively consumes redundant waste heat, avoids the problem that the temperature is too high due to the fact that the waste heat is directly introduced into the main machine, fundamentally protects the rotary furnace tube, prevents irreversible damage, prolongs the service life of the pyrolysis carbonization rotary furnace, meanwhile, achieves efficient recycling of the waste heat, and reduces energy waste.

Description

Technical Field

[0001] This invention relates to the field of waste heat flue gas utilization, specifically to a high-efficiency waste heat flue gas utilization device for a pyrolysis carbonization rotary furnace. Background Technology

[0002] This device is specifically designed for pyrolysis carbonization rotary kiln production scenarios, where the pyrolysis carbonization process requires maintaining a precise temperature environment and generates a large amount of high-temperature waste heat flue gas. The specific technical challenges and shortcomings of existing solutions are as follows: 1. Waste heat and equipment damage: During the pyrolysis and carbonization process, a large amount of high-temperature waste heat is generated. However, the main heating unit can only utilize 30%-40% of it. If the remaining 60%-70% of the waste heat is not properly handled, it will directly lead to excessively high internal temperature of the main unit, causing irreversible damage to the rotary furnace tubes and shortening the service life of the equipment. At the same time, a large amount of waste heat is left idle, which also results in energy waste. 2. Temperature control challenges and high equipment costs: The pyrolysis carbonization process has extremely high requirements for temperature control. However, existing technologies mostly control the temperature through valves. On the one hand, valves are easily damaged by long-term contact with high-temperature flue gas and need to be replaced frequently, which greatly increases the cost of equipment parts. On the other hand, the valve adjustment accuracy is limited, which cannot achieve stable temperature control and makes it difficult to meet the process's requirements for temperature balance. 3. Environmental pollution and lack of heat recovery: In existing technologies, unused high-temperature waste heat flue gas is mostly directly emitted, which not only causes air pollution, but also makes it impossible to recover the heat energy in the flue gas; although some solutions attempt to use fans to guide the flue gas to other places, they are not equipped with effective heat exchange and treatment devices, which can neither realize the utilization of heat energy resources nor solve the pollution problem of flue gas emissions. At the same time, the fans are also prone to damage due to long-term exposure to high-temperature environments. 4. Poor compatibility of traditional thermal energy equipment: Existing equipment used for thermal energy utilization (such as hot water boilers and steam boilers) is not well compatible with the waste heat flue gas system of pyrolysis and carbonization rotary kilns. It cannot efficiently receive and convert the heat in the waste heat flue gas, making it difficult to meet the actual demand of the plant for hot water and other energy. Furthermore, it cannot be combined with the temperature control requirements of the pyrolysis and carbonization process, resulting in limited functionality and low practicality. Summary of the Invention

[0003] The purpose of this invention is to provide a device for efficient utilization of waste heat flue gas in a pyrolysis carbonization rotary kiln, so as to solve the problems mentioned in the background art regarding the utilization of existing waste heat flue gas.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a condensing device, the condensing device including a high-temperature heat storage chamber, a water pipe provided on the lower side of the high-temperature heat storage chamber, a safety valve provided on the water pipe, a first thermocouple and a second thermocouple connected to the outer side of the high-temperature heat storage chamber, heat insulation cotton provided on the inner side of the high-temperature heat storage chamber, and a condensing pipe connected to the middle position of the inner side of the high-temperature heat storage chamber; As a further preferred embodiment of this technical solution: a gap is left between the inner wall of the high-temperature heat storage chamber and the condensation pipe to form a flue gas circulation channel. The two ends of the condensation pipe are respectively connected to the water pipe to form a circulation loop of cooling water between the condensation pipe and the water pipe. The circulation loop is used to realize the heat exchange between the high-temperature flue gas and the cooling water, and to promote the condensation of harmful gases and dioxins in the flue gas. As a further preferred embodiment of this technical solution: the insulation cotton is made of aluminum silicate, the insulation cotton is attached to the inner wall of the high-temperature heat storage chamber, and the thickness of the insulation cotton is 50mm. The insulation cotton is used to reduce heat loss in the high-temperature heat storage chamber and ensure that the flue gas maintains an effective heat exchange temperature in the high-temperature heat storage chamber. As a further preferred embodiment of this technical solution: the first thermocouple and the second thermocouple are respectively disposed on the outside of the air inlet and air outlet of the high-temperature heat storage chamber, and the detection ends of the first thermocouple and the second thermocouple penetrate through the side wall of the high-temperature heat storage chamber and extend into the flue gas flow channel. The first thermocouple and the second thermocouple are used to monitor the flue gas temperature at the air inlet and air outlet of the high-temperature heat storage chamber in real time. As a further preferred embodiment of this technical solution: the water pipeline includes an inlet branch pipe, an outlet branch pipe and a main pipeline. One end of the inlet branch pipe is connected to an external cooling water supply system, and the other end is connected to one end of a condenser pipe. One end of the outlet branch pipe is connected to the other end of the condenser pipe, and the other end is connected to the plant's hot water recycling system. This system is used to transport the cooling water that has absorbed waste heat from the flue gas in the condenser pipe to the plant area, thereby realizing the utilization of waste heat resources. As a further preferred embodiment of this technical solution: the air inlet of the high-temperature heat storage chamber is connected to the high-temperature flue gas outlet of the pyrolysis carbonization furnace through a flue gas conveying pipe. The flue gas conveying pipe adopts a composite structure of brick layer and insulation cotton layer. The brick layer is made of high-temperature refractory brick, and the insulation cotton layer is set in close contact with the inner side of the brick layer to withstand the high-temperature flue gas discharged from the pyrolysis carbonization furnace and reduce heat loss during flue gas conveying. As a further preferred embodiment of this technical solution: the outlet of the high-temperature heat storage chamber is connected to a dust removal device through a pipeline. The dust removal device is a bag filter or a cyclone dust collector, which is used to remove dust from the flue gas after condensation and cooling, and remove particulate impurities from the flue gas. As a further preferred embodiment of this technical solution, it also includes an induced draft fan, which is connected in series on the pipeline between the high-temperature heat storage chamber and the dust removal device. The induced draft fan is equipped with a frequency converter, which is electrically connected to the first thermocouple and the second thermocouple. Based on the flue gas temperature data detected by the first thermocouple and the second thermocouple, the speed of the induced draft fan can be automatically adjusted to control the rate at which the flue gas is introduced into the high-temperature heat storage chamber, thereby regulating the temperature inside the pyrolysis carbonization furnace. As a further preferred embodiment of this technical solution: the condenser pipe is a metal pipe, and the condenser pipe is arranged in a straight line in the middle of the high-temperature heat storage chamber to increase the contact area between the condenser pipe and the high-temperature flue gas. As a further preferred embodiment of this technical solution: the top of the high-temperature heat storage chamber is provided with an exhaust gas release hole, which is connected to a safety valve through a pipeline. When the pressure in the high-temperature heat storage chamber exceeds the preset value due to the accumulation of flue gas, the safety valve automatically opens, and the excess gas is discharged through the exhaust gas release hole to prevent the high-temperature heat storage chamber from being damaged due to overpressure.

[0005] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, 60%-70% of the high-temperature waste heat flue gas that is not utilized by the main unit during the pyrolysis and carbonization process is introduced into a water-cooled horizontal condenser by an induced draft fan. This effectively consumes excess waste heat, avoids the problem of excessive temperature caused by directly introducing waste heat into the main unit, fundamentally protects the rotary kiln tubes, prevents irreversible damage, extends the service life of the pyrolysis and carbonization rotary kiln, and at the same time achieves efficient recovery and utilization of waste heat, reducing energy waste. 2. In this invention, by abandoning the traditional valve temperature control method and adopting a combination of "water-cooled horizontal condenser + variable frequency fan", the flue gas introduction rate can be flexibly adjusted by the variable frequency fan according to the requirements of the pyrolysis carbonization process, thereby accurately controlling the heating temperature of the rotary kiln, so that the temperature difference of pyrolysis carbonization is stably controlled within ±5℃, meeting the stringent requirements of the process for temperature balance; at the same time, it avoids the problem of frequent valve replacement due to high temperature damage, significantly reducing the cost of equipment parts procurement and maintenance. 3. In this invention, a water-cooled heat exchange system is used to condense high-temperature flue gas. During the heat exchange process, harmful gases and dioxins in the flue gas can be condensed, reducing pollutant emissions and solving the environmental pollution problem caused by traditional direct emission of flue gas. At the same time, the water-cooling system can heat water to 60-70°C during the process of cooling the flue gas. The hot water produced can be used for daily use in the factory area, replacing the traditional hot water supply method, reducing additional energy consumption, and achieving the dual energy-saving effect of "environmental protection and emission reduction + heat recovery". 4. In this invention, the flue gas duct adopts a composite structure of "brickwork + insulation cotton", which is resistant to high temperature and not easily damaged, and can effectively withstand the erosion of high temperature flue gas; at the same time, the induced draft fan is placed after the condensation device. After the high temperature flue gas is condensed, the temperature is reduced, which can avoid damage to the induced draft fan by high temperature, extend the service life of the fan, and ensure the stable operation of the entire waste heat utilization system. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the structure of a waste heat flue gas high-efficiency utilization device for a pyrolysis carbonization rotary furnace according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a waste heat flue gas high-efficiency utilization device for a pyrolysis carbonization rotary furnace according to the present invention. Figure 3 ; Figure 3 This is a partial schematic diagram of a waste heat flue gas high-efficiency utilization device for a pyrolysis carbonization rotary furnace according to the present invention.

[0007] In the diagram: 2. Condensation device; 21. High-temperature heat storage chamber; 22. Water pipe; 23. Safety valve; 24. First thermocouple; 25. Second thermocouple; 26. Insulation cotton; 27. Condensation pipe. Detailed Implementation

[0008] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0009] Please see Figures 1-3 As shown, the present invention provides a technical solution for a waste heat flue gas high-efficiency utilization device for a pyrolysis carbonization rotary kiln: it includes a condensation device 2, the condensation device 2 includes a high-temperature heat storage chamber 21, a water pipe 22 is provided on the lower side of the high-temperature heat storage chamber 21, a safety valve 23 is provided on the water pipe 22, a first thermocouple 24 and a second thermocouple 25 are connected to the outer side of the high-temperature heat storage chamber 21, heat insulation cotton 26 is provided on the inner side of the high-temperature heat storage chamber 21, and a condensation pipe 27 is connected to the middle position of the inner side of the high-temperature heat storage chamber 21.

[0010] In this embodiment, a gap is left between the inner wall of the high-temperature heat storage chamber 21 and the condensation pipe 27 to form a flue gas circulation channel. The two ends of the condensation pipe 27 are respectively connected to the water pipe 22 to form a circulation loop of cooling water between the condensation pipe 27 and the water pipe 22. The circulation loop is used to realize the heat exchange between the high-temperature flue gas and the cooling water, and promote the condensation of harmful gases and dioxins in the flue gas.

[0011] In this embodiment, the insulation cotton 26 is made of aluminum silicate. The insulation cotton 26 is attached to the inner wall of the high-temperature heat storage chamber 21 and the thickness of the insulation cotton 26 is 50mm. The insulation cotton 26 is used to reduce heat loss in the high-temperature heat storage chamber 21 and ensure that the flue gas maintains an effective heat exchange temperature in the high-temperature heat storage chamber 21.

[0012] Specifically, the first thermocouple 24 and the second thermocouple 25 are respectively disposed on the outside of the air inlet and air outlet of the high-temperature heat storage chamber 21, and the detection ends of the first thermocouple 24 and the second thermocouple 25 penetrate through the side wall of the high-temperature heat storage chamber 21 and extend into the flue gas flow channel. The first thermocouple 24 and the second thermocouple 25 are used to monitor the flue gas temperature at the air inlet and air outlet of the high-temperature heat storage chamber 21 in real time.

[0013] In this embodiment, the water pipeline 22 includes an inlet branch pipe, an outlet branch pipe, and a main pipeline. One end of the inlet branch pipe is connected to an external cooling water supply system, and the other end is connected to one end of the condenser pipe 27. One end of the outlet branch pipe is connected to the other end of the condenser pipe 27, and the other end is connected to the plant hot water recycling system. It is used to transport the cooling water that has absorbed the waste heat of flue gas in the condenser pipe 27 to the plant area to realize the utilization of waste heat resources.

[0014] Specifically, the air inlet of the high-temperature heat storage chamber 21 is connected to the high-temperature flue gas outlet of the pyrolysis carbonization furnace through a flue gas conveying pipe. The flue gas conveying pipe adopts a composite structure of brick layer and insulation cotton layer. The brick layer is made of high-temperature refractory brick, and the insulation cotton layer is set in close contact with the inner side of the brick layer to withstand the high-temperature flue gas discharged from the pyrolysis carbonization furnace and reduce heat loss during flue gas conveying.

[0015] In this embodiment, the outlet of the high-temperature heat storage chamber 21 is connected to a dust removal device through a pipe. The dust removal device is a bag filter or a cyclone dust collector, which is used to remove dust from the flue gas after condensation and cooling, and remove particulate impurities from the flue gas.

[0016] Specifically, it also includes an induced draft fan, which is connected in series on the pipeline between the high-temperature heat storage chamber 21 and the dust removal device. The induced draft fan is equipped with a frequency converter, which is electrically connected to the first thermocouple 24 and the second thermocouple 25. Based on the flue gas temperature data detected by the first thermocouple 24 and the second thermocouple 25, the speed of the induced draft fan can be automatically adjusted to control the rate at which the flue gas is introduced into the high-temperature heat storage chamber 21, thereby regulating the temperature inside the pyrolysis carbonization furnace.

[0017] In this embodiment, the condensation pipe 27 is a metal pipe, and the condensation pipe 27 is arranged in a straight line in the middle of the inner side of the high temperature heat storage chamber 21 to increase the contact area between the condensation pipe 27 and the high temperature flue gas.

[0018] Specifically, the top of the high-temperature heat storage chamber 21 is provided with an exhaust gas release hole, which is connected to the safety valve 23 through a pipe. When the pressure in the high-temperature heat storage chamber 21 exceeds the preset value due to the accumulation of flue gas, the safety valve 23 will automatically open, and the excess gas will be discharged through the exhaust gas release hole to prevent the high-temperature heat storage chamber 21 from being damaged due to overpressure.

[0019] It should be noted that during the pyrolysis and carbonization process, the main heating unit only utilizes 30%-40% of the waste heat, while the remaining 60%-70% of the waste heat needs to be consumed by this device. This data clearly shows the severity of the waste heat and also reflects the necessity of the device for waste heat recovery. Compared with the existing technology of "direct discharge" or "inefficient recovery", this device can convert this part of the originally wasted waste heat into usable hot water at 60-70℃, which directly reflects the improvement in energy utilization efficiency.

[0020] Working principle or structural principle: Flue gas introduction stage: The high-temperature waste heat flue gas generated by the pyrolysis carbonization furnace is introduced to the inlet end of the high-temperature heat storage chamber of the horizontal condenser through a flue gas conveying pipe with a composite structure of "high-temperature refractory bricks + insulation cotton layer". During this process, the composite pipe can withstand high temperature and reduce heat loss, ensuring that the flue gas enters the heat exchange stage at an effective temperature; Temperature monitoring and rate control stage: The first thermocouple (inlet end) and the second thermocouple (outlet end) monitor the flue gas temperature in the high-temperature heat storage chamber in real time and transmit the temperature data to the frequency converter of the induced draft fan. The frequency converter automatically adjusts the speed of the induced draft fan according to the preset temperature threshold: if the temperature at the inlet end is too high, the speed is increased to accelerate the flue gas introduction rate and increase waste heat consumption; if the temperature is too low, the speed is reduced to slow down the introduction and avoid the furnace temperature from being too low, thereby accurately controlling the temperature inside the pyrolysis carbonization furnace. Heat exchange and waste heat recovery stage: After the high-temperature flue gas enters the high-temperature heat storage chamber, it flows along the flue gas circulation channel between the inner wall of the heat storage chamber and the condenser pipe. At this time, external cooling water enters the vertically arranged condenser pipe through the inlet branch pipe of the water pipeline. The cooling water and the high-temperature flue gas exchange heat through the condenser pipe wall—the flue gas releases waste heat and its temperature gradually decreases, while the cooling water absorbs the waste heat and its temperature rises to 60-70℃. The heated cooling water is then transported to the plant's hot water reuse system through the outlet branch pipe to realize the reuse of waste heat. Hazardous substance condensation and flue gas treatment stage: During the heat exchange process, the temperature of the high-temperature flue gas decreases, and the harmful gases and dioxins in it condense as the temperature drops, adhering to the outer wall of the condensation pipe or settling to the bottom of the heat storage chamber (which can be discharged through periodic cleaning later); the cooled flue gas enters the dust removal device (bag filter or cyclone dust collector) through the outlet of the high-temperature heat storage chamber to remove particulate impurities in the flue gas, and the treated clean flue gas can be discharged. Safety protection phase: During the operation of the high-temperature heat storage chamber, if the pressure inside exceeds the preset value due to the accumulation of flue gas, the safety valve on the water pipe will automatically open, and the excess gas will be discharged through the exhaust gas release hole at the top of the high-temperature heat storage chamber to prevent damage to the heat storage chamber due to overpressure; at the same time, the 50mm thick aluminum silicate insulation cotton attached to the inner wall of the high-temperature heat storage chamber can reduce the loss of heat from the chamber to the outside, ensure that the flue gas is maintained at an effective heat exchange temperature, and ensure stable heat exchange efficiency.

[0021] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0022] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art, inspired by this description, design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the scope of protection of this invention. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for efficient utilization of waste heat flue gas in a pyrolysis carbonization rotary kiln, characterized in that: The device includes a condensing device (2), which includes a high-temperature heat storage chamber (21). A water pipe (22) is provided on the lower side of the high-temperature heat storage chamber (21). A safety valve (23) is provided on the water pipe (22). A first thermocouple (24) and a second thermocouple (25) are connected to the outside of the high-temperature heat storage chamber (21). Insulation cotton (26) is provided on the inside of the high-temperature heat storage chamber (21). A condensing pipe (27) is connected to the middle of the inside of the high-temperature heat storage chamber (21).

2. The waste heat flue gas high-efficiency utilization device for a pyrolysis carbonization rotary kiln according to claim 1, characterized in that: The inner wall of the high-temperature heat storage chamber (21) and the condensation pipe (27) are separated to form a flue gas flow channel. The two ends of the condensation pipe (27) are connected to the water pipe (22) respectively, forming a circulation loop of cooling water between the condensation pipe (27) and the water pipe (22). The circulation loop is used to realize the heat exchange between the high-temperature flue gas and the cooling water, and promote the condensation of harmful gases and dioxins in the flue gas.

3. The waste heat flue gas high-efficiency utilization device for a pyrolysis carbonization rotary kiln according to claim 2, characterized in that: The insulation cotton (26) is made of aluminum silicate. The insulation cotton (26) is attached to the inner wall of the high temperature heat storage chamber (21) and the thickness of the insulation cotton (26) is 50mm. The insulation cotton (26) is used to reduce heat loss in the high temperature heat storage chamber (21) and ensure that the flue gas maintains an effective heat exchange temperature in the high temperature heat storage chamber (21).

4. The waste heat flue gas high-efficiency utilization device for a pyrolysis carbonization rotary kiln according to claim 3, characterized in that: The first thermocouple (24) and the second thermocouple (25) are respectively located on the outside of the air inlet and air outlet of the high-temperature heat storage chamber (21), and the detection ends of the first thermocouple (24) and the second thermocouple (25) penetrate through the side wall of the high-temperature heat storage chamber (21) and extend into the flue gas flow channel. The first thermocouple (24) and the second thermocouple (25) are used to monitor the flue gas temperature at the air inlet and air outlet of the high-temperature heat storage chamber (21) in real time.

5. The waste heat flue gas high-efficiency utilization device for a pyrolysis carbonization rotary kiln according to claim 4, characterized in that: The water pipeline (22) includes an inlet branch pipe, an outlet branch pipe and a main pipeline. One end of the inlet branch pipe is connected to the external cooling water supply system, and the other end is connected to one end of the condenser pipe (27). One end of the outlet branch pipe is connected to the other end of the condenser pipe (27), and the other end is connected to the plant area hot water recycling system. It is used to transport the cooling water that has absorbed the waste heat of flue gas in the condenser pipe (27) to the plant area to realize the utilization of waste heat resources.

6. The waste heat flue gas high-efficiency utilization device for a pyrolysis carbonization rotary kiln according to claim 5, characterized in that: The air inlet of the high-temperature heat storage chamber (21) is connected to the high-temperature flue gas outlet of the pyrolysis carbonization furnace through a flue gas conveying pipe. The flue gas conveying pipe adopts a composite structure of brick layer and insulation cotton layer. The brick layer is made of high-temperature refractory brick, and the insulation cotton layer is attached to the inner side of the brick layer to withstand the high-temperature flue gas discharged from the pyrolysis carbonization furnace and reduce heat loss during flue gas conveying.

7. A waste heat flue gas high-efficiency utilization device for a pyrolysis carbonization rotary kiln according to claim 6, characterized in that: The outlet of the high-temperature heat storage chamber (21) is connected to a dust removal device via a pipe. The dust removal device is a bag filter or a cyclone dust collector, used to remove dust from the flue gas after condensation and cooling, and to remove particulate impurities from the flue gas.

8. The waste heat flue gas high-efficiency utilization device for a pyrolysis carbonization rotary kiln according to claim 7, characterized in that: It also includes an induced draft fan, which is connected in series on the pipe between the high-temperature heat storage chamber (21) and the dust removal device. The induced draft fan is equipped with a frequency converter, which is electrically connected to the first thermocouple (24) and the second thermocouple (25). It can automatically adjust the speed of the induced draft fan to control the rate at which the flue gas is introduced into the high-temperature heat storage chamber (21) based on the flue gas temperature data detected by the first thermocouple (24) and the second thermocouple (25), thereby regulating the temperature inside the pyrolysis carbonization furnace.

9. A high-efficiency waste heat flue gas utilization device for a pyrolysis carbonization rotary kiln according to claim 8, characterized in that: The condenser pipe (27) is a metal pipe, and the condenser pipe (27) is arranged in a straight line in the middle of the inner side of the high temperature heat storage chamber (21) to increase the contact area between the condenser pipe (27) and the high temperature flue gas.

10. A waste heat flue gas high-efficiency utilization device for a pyrolysis carbonization rotary kiln according to claim 9, characterized in that: The top of the high-temperature heat storage chamber (21) is provided with a tail gas release hole. The tail gas release hole is connected to the safety valve (23) through a pipe. When the pressure in the high-temperature heat storage chamber (21) exceeds the preset value due to the accumulation of flue gas, the safety valve (23) will automatically open and the excess gas will be discharged through the tail gas release hole to prevent the high-temperature heat storage chamber (21) from being damaged due to overpressure.

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