A molten salt pyrolysis system and method

Abstract

The present invention relates to the field of molten salt pyrolysis technology, and in particular to a molten salt pyrolysis system and method. In the system, molten salt tanks are respectively arranged at the top and bottom of a reactor, and a cavity is formed between the inner shell and the outer shell of the reactor. Each molten salt tank is connected to the cavity, and a heating device is arranged on the periphery of each molten salt tank. The heating device is used to heat the molten salt in the molten salt tank. The heated molten salt flows from the molten salt tank located above into the molten salt tank located below through the cavity. The heated molten salt can heat the biomass in the inner shell when flowing through the cavity. In this way, the molten salt can be used to indirectly heat the biomass. At the same time, the molten salt flowing into the molten salt tank located below can be directly reused after the reactor and the two molten salt tanks are flipped upside down relative to the frame, thereby reducing the process of molten salt pyrolysis of the biomass.

Description

Technical Field

[0001] The present invention relates to the technical field of molten salt pyrolysis, and in particular to a molten salt pyrolysis system and method. Background Art

[0002] Biomass pyrolysis is the process of heating biomass in an oxygen-free or low-oxygen environment to break it down into pyrolysis gas, bio-oil, and biochar. Molten salts, with their high specific heat capacity, low viscosity, and high electrical conductivity, can rapidly heat biomass.

[0003] In the related art, when molten salt is used to pyrolyze biomass, the molten salt and biomass are usually mixed. In this way, the molten salt needs to be recycled and reused after the pyrolysis is completed, which increases the process of molten salt pyrolysis of biomass.

[0004] Therefore, there is an urgent need for a molten salt pyrolysis system and method to solve the above problems. Summary of the Invention

[0005] The embodiments of the present invention describe a molten salt pyrolysis system and method, which can reduce the process of molten salt pyrolysis of biomass.

[0006] In a first aspect, an embodiment of the present invention provides a molten salt pyrolysis system, comprising:

[0007] A frame body is provided with a rotating assembly;

[0008] The reactor comprises an inner shell, an outer shell, and a door body. The inner shell is used to accommodate biomass. A support member is provided between the inner shell and the outer shell. The edges of the inner shell and the outer shell are sealed and fixed to form an opening. The door body is openably arranged at the opening. The outer shell is arranged outside the inner shell and forms a cavity that passes through the inner shell from top to bottom.

[0009] Two molten salt tanks are respectively fixed to the top and bottom of the reactor by flanges, and the outer shell is rotatably connected to the frame through the rotating assembly so that the reactor and the two molten salt tanks can be turned upside down relative to the frame, each of the molten salt tanks is communicated with the cavity, and a heating device is provided on the periphery of each of the molten salt tanks, and the heating device is used to heat the molten salt in the molten salt tank. The heated molten salt flows from the molten salt tank located above through the cavity into the molten salt tank located below. The heated molten salt can heat the biomass in the inner shell when flowing through the cavity;

[0010] an inert gas bottle, connected to the inner shell and used to introduce inert gas into the inner shell;

[0011] an oil and gas collection device, connected to the inner shell, for collecting oil and gas components generated by the pyrolysis of the biomass;

[0012] A controller is electrically connected to the heating device and is used to control the heating temperature of the heating device.

[0013] In a second aspect, an embodiment of the present invention provides a molten salt pyrolysis method, based on the molten salt pyrolysis system described in the above embodiment, the method includes:

[0014] Step S1, using the controller to control the heating device located above to heat the molten salt in the molten salt tank located above. When the detection temperature of the first temperature sensor of the molten salt tank reaches a first preset temperature, the molten salt in the molten salt tank is kept warm. At this time, the controller controls the solenoid valve located above to open, so that the molten salt in the molten salt tank flows into the cavity through the flange located above under the action of gravity, thereby pyrolyzing the biomass. The solenoid valve located below remains open during the pyrolysis process.

[0015] Step S2, using the controller to adjust the opening of the solenoid valve located above, and when the temperature detected by the second temperature sensor reaches a second preset temperature, using the controller to fine-tune the opening of the solenoid valve so that the temperature detected by the second temperature sensor is within a positive and negative temperature range of the second preset temperature; wherein the first preset temperature is greater than the second preset temperature;

[0016] Step S3, using the controller to determine whether the liquid level of the molten salt in the molten salt tank is lower than the preset lower limit when the pyrolysis process of the biomass is completed; if so, executing step S4; if not, continuing to execute step S2 until the pyrolysis process of the biomass is completed;

[0017] Step S4, using the controller to control the heating device located below to heat the molten salt in the molten salt tank located below until the heating temperature reaches the first preset temperature, and when the liquid level detected by the liquid level sensor located above is lower than the preset lower limit value, using the controller to control the stepper motor to drive the reactor and the two molten salt tanks to flip up and down relative to the frame, and repeatedly executing step S2 until the pyrolysis process of the biomass is completed; wherein, if the reactor and the two molten salt tanks are flipped up and down relative to the frame again, the direction of the second upside-down flipping is opposite to the direction of the first upside-down flipping.

[0018] According to the molten salt pyrolysis system and method provided by the embodiments of the present invention, molten salt tanks are respectively arranged at the top and bottom of the reactor, and a cavity that passes through the inner shell and the outer shell of the reactor is formed from top to bottom. Each molten salt tank is connected to the cavity, and a heating device is arranged on the periphery of each molten salt tank. The heating device is used to heat the molten salt in the molten salt tank. The heated molten salt flows from the molten salt tank located above into the molten salt tank located below through the cavity. The heated molten salt can heat the biomass in the inner shell when flowing through the cavity. In this way, the molten salt can be used to indirectly heat the biomass. At the same time, the molten salt flowing into the molten salt tank located below can be directly reused after the reactor and the two molten salt tanks are turned upside down relative to the frame, thereby reducing the process of molten salt pyrolysis of biomass. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of a molten salt pyrolysis system according to one embodiment is shown;

[0021] Figure 2 Shown Figure 1 The schematic diagram of the structure of the reactor in the molten salt pyrolysis system is shown;

[0022] Figure 3 Shown Figure 1 Schematic diagram of the structure of the door body in the molten salt pyrolysis system shown.

[0023] Reference numerals:

[0024] 1-frame;

[0025] 11-rotation axis;

[0026] 12-gear transmission;

[0027] 2-reactor;

[0028] 21-inner shell;

[0029] 22-housing;

[0030] 221-main body;

[0031] 222-Transition Department;

[0032] 223-Third through hole:

[0033] 224-fourth through hole;

[0034] 23- portal body;

[0035] 231-first through hole;

[0036] 232-second through hole;

[0037] 24- support member;

[0038] 25-cavity;

[0039] 3- molten salt tank;

[0040] 31-flange;

[0041] 32- heating device;

[0042] 33-Liquid level sensor;

[0043] 34-Solenoid valve;

[0044] 4-Inert gas bottle;

[0045] 5-Oil and gas collection device;

[0046] 6-Controller;

[0047] 7-Stepper motor. DETAILED DESCRIPTION

[0048] The solution provided by the present invention is described below in conjunction with the accompanying drawings.

[0049] like Figures 1 to 3 As shown, an embodiment of the present invention provides a molten salt pyrolysis system, which includes a frame 1, a reactor 2, two molten salt tanks 3, an inert gas bottle 4, an oil and gas collection device 5 and a controller 6.

[0050] in:

[0051] The frame 1 is provided with a rotating assembly;

[0052] The reactor 2 includes an inner shell 21, an outer shell 22, and a door 23. The inner shell 21 is used to accommodate biomass. A support member 24 is provided between the inner shell 21 and the outer shell 22. The edges of the inner shell 21 and the outer shell 22 are sealed and fixed to form an opening. The door 23 is openably provided at the opening. The outer shell 22 is provided outside the inner shell 21 and forms a vertically continuous cavity 25 with the inner shell 21.

[0053] The two molten salt tanks 3 are respectively fixed to the top and bottom of the reactor 2 by flanges 31. The outer shell 22 is rotatably connected to the frame 1 through a rotating assembly so that the reactor 2 and the two molten salt tanks 3 can be turned upside down relative to the frame 1. Each molten salt tank 3 is connected to the cavity 25. A heating device 32 is provided on the periphery of each molten salt tank 3. The heating device 32 is used to heat the molten salt in the molten salt tank 3. The heated molten salt flows from the molten salt tank 3 located above into the molten salt tank 3 located below through the cavity 25. The heated molten salt can heat the biomass in the inner shell 21 when flowing through the cavity 25.

[0054] The inert gas bottle 4 is in communication with the inner shell 21 and is used to introduce inert gas into the inner shell 21;

[0055] The oil and gas collection device 5 is in communication with the inner shell 21 and is used to collect the oil and gas components produced by the pyrolysis of biomass;

[0056] The controller 6 is electrically connected to the heating device 32 and is used to control the heating temperature of the heating device 32 .

[0057] In this embodiment, by arranging molten salt tanks 3 at the top and bottom of the reactor 2 respectively, a cavity 25 is formed between the inner shell 21 and the outer shell 22 of the reactor 2, each molten salt tank 3 is connected to the cavity 25, and a heating device 32 is provided on the periphery of each molten salt tank 3. The heating device 32 is used to heat the molten salt in the molten salt tank 3. The heated molten salt flows from the molten salt tank 3 located above into the molten salt tank 3 located below through the cavity 25. The heated molten salt can heat the biomass in the inner shell 21 when flowing through the cavity 25. In this way, the molten salt can be used to indirectly heat the biomass. At the same time, the molten salt flowing into the molten salt tank 3 located below can be directly reused after the reactor 2 and the two molten salt tanks 3 are turned upside down relative to the frame, thereby reducing the process of pyrolysis of biomass molten salt.

[0058] Moreover, molten salt tanks 3 are respectively provided at the top and bottom of the reactor 2, and molten salt pyrolysis is achieved by turning the reactor upside down, which can further achieve the miniaturization of the molten salt pyrolysis system.

[0059] In some embodiments, the inert gas bottle 4 may contain inert gases such as nitrogen and argon to provide the inner shell 21 with an inert atmosphere required for the biomass pyrolysis process. The type of gas contained in the inert gas bottle 4 is not limited.

[0060] It is understandable that the oil and gas collection device 5 can be a condenser tube group to recover different oil and gas components by controlling different condensation temperatures. The specific structure of the oil and gas collection device 5 is not described in detail here.

[0061] In one embodiment of the present invention, a stepping motor 7 is further included, and a rotating assembly includes two rotating shafts 11 and a gear transmission 12. One end of the gear transmission 12 is fixed to the frame 1, and the other end is connected to the stepping motor 7. One end of each of the two rotating shafts 11 is fixed to the housing 22, and one rotating shaft 11 is rotatably connected to the frame 1, and the other rotating shaft 11 is rotatably connected to the gear transmission 12.

[0062] The controller 6 is electrically connected to the stepper motor 7 and is also used to control the movement of the stepper motor 7 to drive the gear box 12 and the two rotating shafts 11 to move, thereby driving the reactor 2 and the two molten salt tanks 3 to flip up and down relative to the frame 1.

[0063] In this embodiment, since the sum of the weight of the reactor 2, the two molten salt tanks 3 and their respective connectors, the biomass and the molten salt is heavy, and the speed of the stepper motor 7 is fast, in order to enable the reactor 2 and the two molten salt tanks 3 to be flipped up and down, it is necessary to use the gear box 12 to slowly rotate 180°, that is, to reduce the speed and increase the force, so as to achieve coordination between the motor speed and the device speed.

[0064] In one embodiment of the present invention, a liquid level sensor 33 is provided in each molten salt tank 3 , and the liquid level sensor 33 is electrically connected to the controller 6 ;

[0065] The liquid level of the molten salt in the molten salt tank 3 is between a preset upper limit and a preset lower limit. When the liquid level in the liquid level sensor 33 is lower than the preset lower limit, the controller 6 controls the stepper motor 7 to drive the reactor 2 and the two molten salt tanks 3 to flip up and down relative to the frame 1.

[0066] In this embodiment, the liquid level sensor 33 is used to monitor the liquid level of the molten salt in the molten salt tank 3 in real time. Since the density of the molten salt decreases with increasing temperature, that is, the volume increases with increasing temperature, it is necessary to limit the amount of molten salt in the molten salt tank 3 (that is, set a preset upper limit value) to prevent safety hazards caused by volume expansion; and the flow of the molten salt in the cavity 25 is driven by gravity, but there is resistance in the flow of the molten salt. Therefore, if the liquid level is too low, the flow rate of the molten salt will slow down, which will cause the heat exchange of the molten salt to the inner shell 21 to fail to meet the requirements, that is, it cannot meet the temperature required for pyrolysis, so it is necessary to limit the amount of molten salt in the molten salt tank 3 again (that is, set a preset lower limit value).

[0067] In one embodiment of the present invention, a solenoid valve 34 is provided at the end where each molten salt tank 3 is connected to the cavity 25. Both solenoid valves 34 are electrically connected to the controller 6. The controller 6 is also used to control the opening of the solenoid valve 34 to control the flow rate of the molten salt flowing through the cavity 25, thereby controlling the heating temperature of the biomass.

[0068] In this embodiment, by providing a solenoid valve 34 at each end where the molten salt tank 3 is connected to the cavity 25, the controller 6 can be used to control the opening of the solenoid valve 34 to control the flow rate of the molten salt flowing through the cavity 25, thereby controlling the heating temperature of the biomass, that is, by controlling the flow rate of the molten salt, the heat exchange rate between the molten salt and the inner shell 21 is controlled, thereby ensuring the temperature required for biomass pyrolysis.

[0069] In one embodiment of the present invention, each molten salt tank 3 is provided with a first temperature sensor (not shown in the figure), and the door body 23 is provided with a second temperature sensor (not shown in the figure), and the first temperature sensor and the second temperature sensor are electrically connected to the controller 6 respectively;

[0070] The controller 6 is further configured to control the heating power of the heating device 32 based on the temperature detected by the first temperature sensor, and to control the opening of the solenoid valve 34 based on the temperature detected by the second temperature sensor.

[0071] In one embodiment of the present invention, the inner shell 21 is a cylindrical structure (Note: Figure 1 The inner shell 21 cannot be seen), the outer shell 22 includes a main body 221 and transition parts 222 arranged at the upper and lower ends of the main body 221. The main body 221 is a cylindrical structure, and the transition part 222 is a conical structure. The narrow end of the transition part 222 is connected to the flange 31, and the wide end is connected to the main body 221. The edge of the inner shell 21 and the edge of the main body 221 are sealed and fixed to form an opening.

[0072] In this embodiment, by providing the outer shell 22 with a transition portion 222 , the molten salt flowing out of the flange 31 can be effectively directed to the space between the main body 221 and the inner shell 21 to a greater extent, thereby effectively transferring the heat of the molten salt to the inner shell 21 .

[0073] In some embodiments, the columnar structure may be a cylindrical structure or a prismatic structure, such as a quadrangular prism structure (ie, a rectangular parallelepiped structure), which is not limited herein.

[0074] It is known that the structure of the inner shell 21 and the outer shell 22 may be other structures besides the above structures. Figure 2 In one embodiment of the present invention, both the inner shell 21 and the outer shell 22 are spherical structures.

[0075] In this embodiment, when the inner shell 21 and the outer shell 22 are both spherical structures, the heat of the molten salt can be transferred to the inner shell 21 to the greatest extent.

[0076] Please continue reading Figure 2In one embodiment of the present invention, the outer shell 22 is provided with a third through hole 223 and a fourth through hole 224 spaced apart from each other in an upper and lower manner. The third through hole 223 and the fourth through hole 224 are both connected to the cavity 25. When the biomass pyrolysis is completed, the cooling medium enters the cavity 25 through the third through hole 223 or the fourth through hole 224 located above and flows out from the fourth through hole 224 or the third through hole 223 located below to cool the inner shell 21.

[0077] In this embodiment, when the biomass pyrolysis process is completed, in order to take out the pyrolysis products of the biomass as quickly as possible, it can be considered to pass a cooling medium into the cavity 25 .

[0078] In some embodiments, the cooling medium may be water or other media, which are not limited herein.

[0079] See also Figure 3 In one embodiment of the present invention, the door body 23 is provided with a first through hole 231 and a second through hole 232 spaced apart from each other. When the biomass is pyrolyzed, the first through hole 231 or the second through hole 232 located above is connected to the oil and gas collection device 5.

[0080] In this embodiment, since the oil and gas components generated by the pyrolysis of biomass will float above, it is necessary to ensure that the oil and gas collection device 5 is always connected to the upper space of the inner shell 21 during the biomass pyrolysis process. For this purpose, it can be considered to provide the door body 23 with a first through hole 231 and a second through hole 232 spaced apart from each other. In this way, when the biomass is pyrolyzed, the first through hole 231 or the second through hole 232 located above is connected to the oil and gas collection device 5, while the second through hole 232 or the first through hole 231 located below is in a closed state.

[0081] In addition, an embodiment of the present invention further provides a molten salt pyrolysis method. Based on the molten salt pyrolysis system mentioned in the above embodiment, the method includes:

[0082] Step S1: Using the controller 6 to control the upper heating device 32 to heat the molten salt in the upper molten salt tank 3. When the detection temperature of the first temperature sensor of the molten salt tank 3 reaches a first preset temperature, the molten salt in the molten salt tank 3 is kept warm. At this time, the controller 6 controls the upper solenoid valve 34 to open, so that the molten salt in the molten salt tank 3 flows into the cavity 25 through the upper flange 31 under the action of gravity, thereby pyrolyzing the biomass. The lower solenoid valve 34 remains open during the pyrolysis process.

[0083] Step S2: Using the controller 6 to adjust the opening of the upper solenoid valve 34, when the detection temperature of the second temperature sensor reaches the second preset temperature, using the controller 6 to fine-tune the opening of the solenoid valve 34 so that the detection temperature of the second temperature sensor is within a positive and negative temperature range of the second preset temperature (this achieves the heat preservation operation of biomass pyrolysis, while the pyrolysis method of direct mixing of molten salt and biomass does not require controlling the valve opening, that is, only the temperature of the heating device needs to be controlled, which is different from the heat preservation operation during pyrolysis in the related art); wherein the first preset temperature is greater than the second preset temperature;

[0084] Step S3, using the controller 6 to determine whether the liquid level of the molten salt in the molten salt tank 3 is lower than the preset lower limit when the pyrolysis process of the biomass is completed, if yes, executing step S4, if not, continuing to execute step S2 until the pyrolysis process of the biomass is completed;

[0085] Step S4, use the controller 6 to control the heating device 32 located below to heat the molten salt in the molten salt tank 3 located below until the heating temperature reaches a first preset temperature, and when the liquid level detected by the liquid level sensor 33 located above is lower than the preset lower limit value, use the controller 6 to control the stepper motor 7 to drive the reactor 2 and the two molten salt tanks 3 to flip up and down relative to the frame 1, and repeat step S2 until the pyrolysis process of the biomass is completed; wherein, if the reactor 2 and the two molten salt tanks 3 are flipped up and down again relative to the frame 1, the direction of the second flipping is opposite to the direction of the first flipping (this can avoid bending of the lines or pipelines).

[0086] It can be understood that the molten salt pyrolysis method provided in this embodiment and the molten salt pyrolysis system provided in the above embodiment are based on the same inventive concept, so the two have the same beneficial effects and will not be described in detail here.

[0087] 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 entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes 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.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A molten salt pyrolysis system, characterized in that: include: A frame (1) is provided with a rotating assembly; A reactor (2) comprises an inner shell (21), an outer shell (22) and a door body (23); the inner shell (21) is used to accommodate biomass; a support member (24) is provided between the inner shell (21) and the outer shell (22); the edge of the inner shell (21) and the edge of the outer shell (22) are sealed and fixed to form an opening; the door body (23) is openably provided at the opening; the outer shell (22) is provided outside the inner shell (21) and forms a cavity (25) that is connected vertically with the inner shell (21); Two molten salt tanks (3) are fixed to the top and bottom of the reactor (2) respectively through flanges (31); the outer shell (22) is rotatably connected to the frame (1) through the rotating assembly, so that the reactor (2) and the two molten salt tanks (3) can be turned upside down relative to the frame (1); each of the molten salt tanks (3) is connected to the cavity (25); a heating device (32) is provided on the periphery of each of the molten salt tanks (3); the heating device (32) is used to heat the molten salt in the molten salt tank (3); the heated molten salt flows from the molten salt tank (3) located above through the cavity (25) into the molten salt tank (3) located below; the heated molten salt can heat the biomass in the inner shell (21) when flowing through the cavity (25); an inert gas bottle (4), connected to the inner shell (21), and used for introducing inert gas into the inner shell (21); An oil and gas collecting device (5), in communication with the inner shell (21), for collecting oil and gas components generated by the pyrolysis of the biomass; A controller (6) is electrically connected to the heating device (32) and is used to control the heating temperature of the heating device (32).

2. The molten salt pyrolysis system according to claim 1, characterized in that: The door body (23) is provided with a first through hole (231) and a second through hole (232) spaced apart from each other. When the biomass is pyrolyzed, the first through hole (231) or the second through hole (232) located above is connected to the oil and gas collecting device (5).

3. The molten salt pyrolysis system according to claim 1, characterized in that: The inner shell (21) and the outer shell (22) are both spherical structures.

4. The molten salt pyrolysis system according to claim 1, characterized in that: The inner shell (21) is a cylindrical structure, and the outer shell (22) includes a main body (221) and transition parts (222) arranged at the upper and lower ends of the main body (221). The main body (221) is a cylindrical structure, and the transition part (222) is a conical structure. The narrow end of the transition part (222) is connected to the flange (31), and the wide end is connected to the main body (221). The edge of the inner shell (21) and the edge of the main body (221) are sealed and fixed to form the opening.

5. The molten salt pyrolysis system according to claim 1, characterized in that: The outer shell (22) is provided with a third through hole (223) and a fourth through hole (224) spaced apart from each other in an upper and lower manner. The third through hole (223) and the fourth through hole (224) are both communicated with the cavity (25). When the biomass pyrolysis is completed, the cooling medium enters the cavity (25) through the third through hole (223) or the fourth through hole (224) located above and flows out through the fourth through hole (224) or the third through hole (223) located below, so as to cool the inner shell (21).

6. The molten salt pyrolysis system according to any one of claims 1 to 5, characterized in that: It also includes a stepping motor (7), the rotating assembly includes two rotating shafts (11) and a gear transmission (12), one end of the gear transmission (12) is fixed to the frame (1), and the other end is connected to the stepping motor (7), one end of the two rotating shafts (11) is fixed to the housing (22), one of the rotating shafts (11) is rotatably connected to the frame (1), and the other rotating shaft (11) is rotatably connected to the gear transmission (12); The controller (6) is electrically connected to the stepper motor (7), and the controller (6) is also used to control the movement of the stepper motor (7) to drive the gear box (12) and the two rotating shafts (11) to move, thereby driving the reactor (2) and the two molten salt tanks (3) to flip up and down relative to the frame (1).

7. The molten salt pyrolysis system according to claim 6, characterized in that: Each of the molten salt tanks (3) is provided with a liquid level sensor (33), and the liquid level sensor (33) is electrically connected to the controller (6); The liquid level of the molten salt in the molten salt tank (3) is between a preset upper limit value and a preset lower limit value. When the liquid level in the liquid level sensor (33) is lower than the preset lower limit value, the controller (6) controls the stepper motor (7) to operate, thereby driving the reactor (2) and the two molten salt tanks (3) to flip up and down relative to the frame (1).

8. The molten salt pyrolysis system according to claim 7, characterized in that: Each end portion where the molten salt tank (3) is connected to the cavity (25) is provided with a solenoid valve (34), and both of the solenoid valves (34) are electrically connected to the controller (6). The controller (6) is also used to control the opening of the solenoid valve (34) to control the flow rate of the molten salt flowing through the cavity (25), thereby controlling the heating temperature of the biomass.

9. The molten salt pyrolysis system according to claim 8, characterized in that: Each of the molten salt tanks (3) is provided with a first temperature sensor, and the door body (23) is provided with a second temperature sensor, and the first temperature sensor and the second temperature sensor are electrically connected to the controller (6) respectively; The controller (6) is further configured to control the heating power of the heating device (32) based on the temperature detected by the first temperature sensor, and to control the opening of the solenoid valve (34) based on the temperature detected by the second temperature sensor.

10. A molten salt pyrolysis method, characterized in that: Based on the molten salt pyrolysis system according to claim 9, the method comprises: Step S1, using the controller (6) to control the heating device (32) located above to heat the molten salt in the molten salt tank (3) located above, and when the detection temperature of the first temperature sensor of the molten salt tank (3) reaches a first preset temperature, the molten salt in the molten salt tank (3) is kept warm, and at this time, the controller (6) controls the electromagnetic valve (34) located above to open, so that the molten salt in the molten salt tank (3) flows into the cavity (25) through the flange (31) located above under the action of gravity, thereby pyrolyzing the biomass; wherein the electromagnetic valve (34) located below is kept open during the pyrolysis process; Step S2, using the controller (6) to adjust the opening of the electromagnetic valve (34) located above, and when the detection temperature of the second temperature sensor reaches a second preset temperature, using the controller (6) to fine-tune the opening of the electromagnetic valve (34) so ​​that the detection temperature of the second temperature sensor is within a positive and negative temperature allowable range of the second preset temperature; wherein the first preset temperature is greater than the second preset temperature; Step S3, using the controller (6) to determine whether the liquid level of the molten salt in the molten salt tank (3) is lower than the preset lower limit when the pyrolysis process of the biomass is completed, if yes, executing step S4, if not, continuing to execute step S2 until the pyrolysis process of the biomass is completed; Step S4, using the controller (6) to control the heating device (32) located below to heat the molten salt in the molten salt tank (3) located below until the heating temperature reaches the first preset temperature, and when the liquid level detected by the liquid level sensor (33) located above is lower than the preset lower limit value, using the controller (6) to control the stepper motor (7) to drive the reactor (2) and the two molten salt tanks (3) to flip up and down relative to the frame (1), and cyclically execute step S2 until the pyrolysis process of the biomass is completed; wherein, if the reactor (2) and the two molten salt tanks (3) are flipped up and down again relative to the frame (1), the direction of the second flipping is opposite to the direction of the first flipping.

Images