Continuous feeding sealing device and method for biomass pyrolyzing furnace

Abstract

The invention provides a continuous feeding sealing device of a biomass pyrolyzing furnace. The continuous feeding sealing device comprises a circular tube spiral conveyor, a first spiral shaft and two sections of first spiral blades, wherein the circular tube spiral conveyor is communicated with the biomass pyrolyzing furnace; the first spiral shaft is arranged in a shell in the horizontal direction; a dense area is formed between the first spiral shaft between the first spiral blades at the two ends and the shell; the inert gas conveying unit is communicated with the dense area; the pressure detection unit is arranged in the biomass pyrolyzing furnace and used for detecting the pressure value of the biomass pyrolyzing furnace. The controller is connected with the pressure detection unit and used for receiving the pressure value detected by the pressure detection unit, comparing the detected pressure value with a preset set value in the controller, and adjusting the gas supply pressure of the inert gas conveying unit when the pressure value in the biomass pyrolyzing furnace is larger than the set value. The invention further provides a continuous feeding sealing method. The biomass pyrolysis furnace solves the problems that external air enters the biomass pyrolysis furnace to affect pyrolysis carbonization reaction and even cause safety production accidents.

Description

Technical Field

[0001] The invention relates to the technical field of biomass pyrolysis and carbonization, in particular to a continuous feeding sealing device and method for a biomass pyrolysis furnace. Background Art

[0002] my country's biomass is diverse, with large output and difficult to handle, which has become one of the serious problems facing my country. Coal-fired boilers co-process biomass to reduce coal and replace it, which is an important application direction for the future.

[0003] Organic solid wastes such as agricultural and forestry straw biomass waste are suitable for coupling treatment with coal-fired boilers, and biomass can be used to replace coal-fired boiler fuel. The rational energy utilization of biomass is of great significance.

[0004] Biochar is prepared by pyrolysis in a rotary biomass pyrolysis furnace in the absence of oxygen or oxygen. Usually, biochar is generally fed to the rotary biomass pyrolysis furnace by a round tube screw conveyor. The biomass raw material has the characteristics of high looseness and low density. During the feeding process, due to poor feeding, the feeding amount is sometimes reduced or even broken. When there is little or no material in the screw conveyor, the atmosphere is connected to the inside of the rotary biomass pyrolysis furnace through the screw conveyor. Because the biomass pyrolysis furnace is slightly negative pressure during production, a small amount of air entering the furnace will affect the pyrolysis and carbonization reaction of the biomass. A large amount of air entering the biomass pyrolysis furnace will cause an explosion hazard. In serious cases, it will cause equipment loss and personal injury, affecting safe production.

[0005] Therefore, in order to solve the problem that when the existing circular tube screw conveyor is feeding, external air enters the biomass pyrolysis furnace due to reduced feed amount or even feed interruption, affecting the pyrolysis and carbonization reaction and even causing production safety accidents, the present invention designs a continuous feeding sealing device and method for the biomass pyrolysis furnace. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a continuous feeding sealing device and method for a biomass pyrolysis furnace, aiming to solve the problems raised in the technical background, and solve the problem that external air enters the biomass pyrolysis furnace due to reduced feed amount or even feed interruption, affecting the pyrolysis and carbonization reaction, and even causing production safety accidents.

[0007] In order to solve the above technical problems, the first implementation scheme provided by the present invention is to provide a continuous feeding sealing device for a biomass pyrolysis furnace, comprising a round tube screw conveyor, the round tube screw conveyor is connected to the biomass pyrolysis furnace, the round tube screw conveyor comprises a shell, a first screw shaft, a first spiral blade and a first driving assembly for driving the first screw shaft to rotate, the first screw shaft is arranged in the shell along the horizontal direction, the first spiral blade is wound on the first screw shaft located at both ends of the shell, and the first spiral blades wound at both ends of the first screw shaft are discontinuous, and a dense area is formed between the first screw shaft located between the first spiral blades at both ends and the shell, and the dense area is used to squeeze the biomass raw material to compact the fluffy biomass raw material; and further comprising:

[0008] The inert gas delivery unit is connected with the dense zone, and delivers inert gas to the dense zone to discharge the air entering the dense zone, and at the same time forms an air curtain in the dense zone to isolate the gas in the biomass pyrolysis furnace from being discharged.

[0009] The pressure detection unit is arranged in the biomass pyrolysis furnace and is used to detect the pressure value of the biomass pyrolysis furnace during normal production.

[0010] The controller is connected to the pressure detection unit, and is used to receive the pressure value detected by the pressure detection unit, and compare the detected pressure value with a preset value in the controller. When the pressure value in the biomass pyrolysis furnace is greater than the set value, the gas supply pressure of the inert gas delivery unit is adjusted.

[0011] Preferably, the length of the first spiral shaft located between the first spiral blades at both ends is 1.5 to 3 pitches.

[0012] Preferably, the gap between the first spiral blade and the inner wall of the housing is 5 mm to 10 mm.

[0013] Preferably, the distance between two adjacent spiral blades is 100 mm to 300 mm.

[0014] Preferably, the shell is provided with a material silo with a reduced diameter, and a feeding mechanism for compacting the biomass raw materials is provided in the material silo. The feeding mechanism includes a second screw shaft, which is vertically arranged in the material silo. The top of the second screw shaft is connected to the second driving member through a gear transmission, and a second spiral blade matching the material silo with a reduced diameter is wound around the second screw shaft.

[0015] Preferably, two obliquely arranged pressing rods are sleeved and fixed on the second spiral shaft located above the top of the second spiral blade, and the bottom end of each pressing rod abuts against the inner wall of the material bin body.

[0016] Preferably, the inert gas delivery unit includes an inert gas supply component and at least one inert gas interface, wherein each inert gas interface is arranged on a shell located in a dense area, each inert gas interface corresponds to and is connected to a vent hole opened on the shell one by one, and the inert gas supply component is connected to each inert gas interface.

[0017] Preferably, the number of the inert gas interfaces is multiple, and the multiple inert gas interfaces are evenly distributed on the shell along the circumference of the dense area outside the shell.

[0018] Preferably, the inert gas is nitrogen.

[0019] The second implementation scheme provided by the present invention is to provide a sealing method for a continuous feeding sealing device of a biomass pyrolysis furnace, comprising the following steps:

[0020] The biomass raw material is fed into the circular tube screw conveyor, and the circular tube screw conveyor rotates, and the biomass raw material is squeezed under the drive of the first spiral blade, so that the biomass raw material moves from the direction of the circular tube screw conveyor feed port to the direction of the circular tube screw conveyor discharge port.

[0021] When the biomass raw material moves to the compacting zone, the biomass raw material is squeezed to compact the fluffy biomass raw material.

[0022] The pressure value in the biomass pyrolysis furnace is detected by a pressure detection unit. When the pressure value in the biomass pyrolysis furnace is greater than the preset value in the controller, the pressure of the gas supplied to the dense zone by the inert gas delivery unit is adjusted so that the air entering the dense zone is discharged and at the same time, a gas curtain is formed in the dense zone to isolate the gas in the biomass pyrolysis furnace from being discharged.

[0023] Compared with the prior art, the present invention has the following innovative effects:

[0024] 1. In the present invention, a dense zone without the first spiral blades is provided in the middle of the first spiral shaft having the first spiral blades at both ends. When the biomass raw material is transported to the dense zone by the circular tube screw conveyor through the first spiral blades, the biomass raw material with high looseness and low density is squeezed into a material column, which reduces the looseness of the biomass pigment, thereby reducing the probability of the problems of reduced feed amount and material breakage, and preliminarily reduces the probability of external air entering the furnace, thereby avoiding a small amount of air entering the furnace to affect the pyrolysis and carbonization reaction of the biomass, thereby increasing the high-temperature pyrolysis reaction and reducing heat consumption.

[0025] The pressure value in the biomass pyrolysis furnace detected by the pressure detection unit is compared with the preset set value in the controller. When the pressure in the biomass pyrolysis furnace increases, the controller sends a signal to adjust the gas supply pressure of the inert gas delivery unit (increase the gas supply pressure of the inert gas delivery unit). At this time, the pressure of the inert gas delivery unit, on the one hand, discharges the air entering the dense zone, and on the other hand, forms an air curtain in the dense zone to isolate the gas in the biomass pyrolysis furnace from being discharged, thereby preventing a large amount of air from entering the pyrolysis furnace when there is little or no material in the circular tube screw conveyor, thereby accelerating the pyrolysis and carbonization reaction and avoiding the occurrence of explosions.

[0026] 2. The present invention provides a feeding mechanism that can compact biomass raw materials, and gradually compacts the materials during the feeding process to increase the feed amount. The diameter of the second spiral blade used in the feeding mechanism and the diameter of the material bin body are gradually reduced from top to bottom, and then when the diameter of the second spiral blade is gradually reduced, the available space of the spiral channel formed by the material bin body also becomes smaller. As the biomass raw materials move along the second spiral blade, the biomass raw materials are forced to enter a smaller space. The gaps between the biomass raw materials become smaller, the density of the biomass raw materials gradually increases, and a compaction effect is formed. Moreover, as the diameter of the second spiral blade is gradually reduced, the driving force of the second spiral blade on the biomass raw materials increases. The second spiral blade pushes the biomass raw materials to move forward along the spiral channel, and the gradual reduction of the spiral channel causes the biomass raw materials to be subjected to greater axial pressure at each distance. The increase in pressure causes the gaps between the biomass raw materials to be further compressed, thereby achieving compaction. In addition, a triangular anti-lifting frame is formed on the second spiral shaft above the top of the second spiral blade by two inclined pressing rods, which further allows the biomass raw materials fed into the material bin body to be transported downward and compacted.

[0027] 3. The device used in the present invention can be well matched with the process method of the present invention, and the heat carried by the pyrolysis gas is maximized. This is because the dense area blocks the overflow of the pyrolysis gas in the biomass pyrolysis furnace, and the pyrolysis gas dries and heats the material at the rear of the dense area, thereby increasing the temperature of the material entering the furnace, thereby realizing the heat energy conversion between the feeding device and the pyrolysis furnace, which has an excellent effect on improving the subsequent pyrolysis efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The present invention is a schematic structural diagram of a continuous feeding sealing device for a biomass pyrolysis furnace.

[0029] Description of reference numerals:

[0030] 1. Material bin; 2. Feeding mechanism; 3. First driving assembly; 4. Connecting assembly; 5. Fixed bracket; 6. First spiral shaft; 7. First spiral blade; 8. Shell; 9. Densified area; 10. Air vent; 11. Inert gas interface; 12. Pressure detection unit; 13. Front cover of pyrolysis furnace; 14. Packing seal assembly; 15. Pyrolysis gas seal assembly; 16. Pyrolysis cylinder. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The inventors found that biomass raw materials have the characteristics of high looseness and low density, so there will be bridging problems such as reduced feeding and broken feeding when feeding. In the feeding process, poor feeding sometimes leads to reduced feeding or even broken feeding. When there is little or no material in the screw conveyor, the atmosphere is connected to the inside of the rotary biomass pyrolysis furnace through the screw conveyor. Because the biomass pyrolysis furnace is slightly negative pressure during production, a small amount of air entering the furnace will affect the pyrolysis and carbonization reaction of the biomass. A large amount of air entering the biomass pyrolysis furnace will cause explosion hazards, which may cause equipment losses and personal injuries in serious cases, affecting safe production.

[0033] In view of this, the present invention provides a continuous feeding sealing device and method for a biomass pyrolysis furnace, which solves the problem that external air enters the biomass pyrolysis furnace due to reduced feed amount or even feed interruption, affecting the pyrolysis and carbonization reaction and even causing production safety accidents.

[0034] like Figure 1 As shown, a continuous feeding sealing device for a biomass pyrolysis furnace includes a round tube screw conveyor, which is connected to the biomass pyrolysis furnace (the discharge port of the round tube screw conveyor extends into the pyrolysis cylinder 16 of the biomass pyrolysis furnace), and the round tube screw conveyor includes a shell 8, a first screw shaft 6, a first spiral blade 7, and a first drive assembly 3 for driving the first screw shaft 6 to rotate (the first drive assembly is a 3-drive motor), and also includes:

[0035] The first spiral shaft 6 is arranged in the horizontal direction in the shell 8, and the first spiral blades 7 are wound on the first spiral shaft 6 located at both ends of the shell 8, and the first spiral blades 7 wound at both ends of the first spiral shaft 6 are discontinuous, that is, the middle of the first spiral blades 7 wound at both ends of the first spiral shaft 6 is a light axis without the first spiral blades 7, and a compacting area 9 is formed between the first spiral shaft 6 and the shell 8 located between the first spiral blades 7 at both ends, and the compacting area 9 is used to squeeze the biomass raw material to compact the fluffy biomass raw material; the compacting area 9 is arranged at the middle or rear part of the first spiral shaft 6 where the two sections of the first spiral blades 7 are disconnected, and also includes:

[0036] An inert gas delivery unit is connected to the compacting zone 9, and delivers inert gas to the compacting zone 9 to exhaust the air entering the compacting zone 9 and form an air curtain in the compacting zone 9 to isolate the gas in the biomass pyrolysis furnace from being discharged;

[0037] A pressure detection unit 12 is provided in the biomass pyrolysis furnace and is used to detect the pressure value of the biomass pyrolysis furnace during normal production;

[0038] The controller is connected to the pressure detection unit 12, and is used to receive the pressure value detected by the pressure detection unit 12, and compare the detected pressure value with the set value preset in the controller. When the pressure value in the biomass pyrolysis furnace is greater than the set value, the gas supply pressure of the inert gas delivery unit is adjusted.

[0039] In the present invention, a first spiral shaft without a first spiral blade 7 is arranged in the middle of the first spiral shaft with first spiral blades at both ends. The first spiral shaft without a first spiral blade 7 is formed with a shell 8 to form a dense area 9. When the biomass raw material is transported to the dense area 9 by the round tube screw conveyor through the first spiral blade 7, the inner wall of the shell 8 and the first spiral shaft without a first spiral blade 7 are squeezed to squeeze the biomass raw material. The biomass raw material with high looseness and low density is squeezed into a material column, which reduces the looseness of the biomass pigment, thereby reducing the probability of the problems of reduced feeding amount and material breakage, and preliminarily reduces the probability of external air entering the furnace, thereby avoiding a small amount of air entering the furnace, thereby enhancing the pyrolysis and carbonization reaction of the biomass, and avoiding the occurrence of explosions.

[0040] The pressure value in the biomass pyrolysis furnace detected by the pressure detection unit 12 is compared with the preset set value in the controller. When the pressure in the biomass pyrolysis furnace increases, the controller sends a signal to adjust the gas supply pressure of the inert gas delivery unit (increase the gas supply pressure of the inert gas delivery unit). At this time, the pressure of the inert gas delivery unit, on the one hand, discharges the air entering the dense zone 9, and on the other hand, forms an air curtain at the dense zone 9 to isolate the gas in the biomass pyrolysis furnace from being discharged, thereby preventing a large amount of air from entering the pyrolysis furnace when there is little or no material in the circular tube screw conveyor, thereby accelerating the pyrolysis and carbonization reaction and avoiding the occurrence of explosions.

[0041] Specifically, the length of the first spiral shaft 6 located between the first spiral blades 7 at both ends is 1.5 to 3 pitch lengths. The purpose is to compact the biomass into a material column and avoid carrying air into the biomass pyrolysis furnace.

[0042] Specifically, the gap between the spiral blade 7 and the inner wall of the shell 8 is 5 mm to 10 mm, which is used to ensure that the biomass raw material is compacted without affecting the feed amount.

[0043] Specifically, the distance between two adjacent spiral blades is 100 mm to 300 mm. The purpose of setting such a distance between two adjacent spiral blades is to gradually compact the material to increase the feed amount without affecting the feeding process.

[0044] Specifically, a material silo body 1 with a reduced diameter is provided on the shell 8, and a feeding mechanism 2 for compacting biomass raw materials is provided in the material silo body 1. The feeding mechanism 2 includes a second screw shaft, and the second screw shaft is vertically arranged in the material silo body 1. The top of the second screw shaft is connected to the second driving member through a gear transmission, and a second spiral blade matching the material silo body 1 with the reduced diameter is wound around the second screw shaft.

[0045] The second driving member here includes a driving motor, a rotating shaft, a driving tooth and a driven tooth. The driving motor is arranged outside the material bin body 1. The rotating shaft of the driving motor is fixedly connected to one end of the rotating shaft. The rotating shaft penetrates into the material bin body 1, and a driving tooth is fixed on the other end of the rotating shaft. The driven tooth is fixed on the second spiral shaft, and the driving tooth is meshed with the driven tooth.

[0046] The feeding mechanism 2 can compact the biomass raw materials, and gradually compact the materials during the feeding process to increase the feed amount. The diameter of the second spiral blade used in the feeding mechanism 2 and the diameter of the material bin 1 are gradually reduced from top to bottom, and then when the diameter of the second spiral blade is gradually reduced, the available space of the spiral channel formed by the material bin 1 is also reduced. As the biomass raw materials move along the spiral blade, the biomass raw materials are forced to enter a smaller space. The gaps between the biomass raw materials become smaller, and the density of the biomass raw materials gradually increases, forming a compaction effect, and as the diameter of the second spiral blade gradually decreases, the driving force of the second spiral blade on the biomass raw materials increases. The second spiral blade pushes the biomass raw materials to move forward along the spiral channel, and the gradual reduction of the spiral channel causes the biomass raw materials to be subjected to greater axial pressure at each distance. The increase in pressure causes the gaps between the biomass raw materials to be further compressed, thereby achieving compaction.

[0047] Two inclined pressing rods are also fixedly mounted on the second spiral shaft above the top of the second spiral blade, and the bottom end of each pressing rod abuts against the inner wall of the material bin 1. A triangular anti-lifting frame is formed by two inclined pressing rods on the second spiral shaft above the top of the second spiral blade, which further transports the biomass material fed into the material bin 1 downward and compacts it.

[0048] Specifically, the inert gas delivery unit includes an inert gas supply component and at least one inert gas interface 11, wherein each inert gas interface 11 is arranged on the shell 8 located in the dense area 9, each inert gas interface 11 corresponds to and is connected to the vent hole 10 opened on the shell 8 one by one, and the inert gas supply component is connected to each inert gas interface 11.

[0049] Specifically, a plurality of inert gas interfaces 11 are provided, and the plurality of inert gas interfaces are evenly distributed on the shell 8 along the circumference of the dense area 9 outside the shell 8 , which is conducive to uniform delivery of the inert gas.

[0050] Specifically, the inert gas is nitrogen. Nitrogen is selected for safety protection on the one hand, and nitrogen is cheap on the other hand, which can meet the requirements.

[0051] A sealing method for a continuous feeding sealing device of a biomass pyrolysis furnace comprises the following steps:

[0052] The biomass raw material is fed into the circular screw conveyor, and the circular screw conveyor rotates, and the biomass raw material is squeezed under the drive of the first spiral blade 7, so that the biomass raw material moves from the direction of the circular screw conveyor inlet to the direction of the circular screw conveyor outlet.

[0053] When the biomass raw material moves to the compacting zone 9, the biomass raw material is squeezed so that the fluffy biomass raw material is compacted into a material column.

[0054] The pressure value in the biomass pyrolysis furnace is detected by the pressure detection unit 12. When the pressure value in the biomass pyrolysis furnace is greater than the preset value in the controller, the pressure of the gas supply to the dense zone 9 of the inert gas delivery unit is adjusted so that the air entering the dense zone 9 is discharged and an air curtain is formed in the dense zone 9 to isolate the gas in the biomass pyrolysis furnace from being discharged. Air is prevented from entering the pyrolysis cylinder 16 of the biomass pyrolysis furnace.

[0055] Example

[0056] like Figure 1As shown, in this embodiment, the first spiral blades 7 are symmetrically wound around the two ends of the first spiral shaft 6, and the first spiral shaft 6 and the shell 8 located between the first spiral blades 7 at the two ends constitute a dense area 9, the shell 8 is arranged on the fixed bracket 5, and the end of the shell 8 is provided with a first driving component 3, and the first driving component 3 is a driving motor, and the driving motor is fixedly connected to the first spiral shaft 6 through the connecting component 4, the material bin body 1 is connected to the feed port of the shell 8, the shell 8 is inserted into the front end cover 13 of the pyrolysis furnace, and is sealed by the packing sealing component 14, and the outlet of the shell 8 is located in the pyrolysis cylinder 16 of the biomass pyrolysis furnace, and the biomass pyrolysis furnace is also connected to a pyrolysis gas sealing component 15.

[0057] The biomass raw material is fed into the circular tube screw conveyor, and the circular tube screw conveyor rotates to squeeze the biomass raw material under the drive of the first spiral blade 7. When the biomass raw material moves to the compacting area 9, the biomass raw material is squeezed so that the fluffy biomass raw material is compacted into a material column, and then the compacted material column will continue to be conveyed under the drive of the first spiral blade 7 again, so that the biomass raw material is sent from the discharge port of the circular tube screw conveyor into the pyrolysis cylinder 16 of the biomass pyrolysis furnace to participate in the pyrolysis reaction.

[0058] The pressure value in the biomass pyrolysis furnace detected by the pressure detection unit 12 is compared with the preset set value in the controller. When the pressure in the biomass pyrolysis furnace increases, the controller sends a signal to adjust the gas supply pressure of the inert gas delivery unit (increase the gas supply pressure of the inert gas delivery unit). At this time, the pressure of the inert gas delivery unit, on the one hand, discharges the air entering the dense zone 9, and on the other hand, forms an air curtain at the dense zone 9 to isolate the gas in the biomass pyrolysis furnace from being discharged, thereby preventing a large amount of air from entering the pyrolysis furnace when there is little or no material in the circular tube screw conveyor, thereby accelerating the pyrolysis and carbonization reaction and avoiding the occurrence of explosions.

[0059] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A continuous feeding sealing device for a biomass pyrolysis furnace, comprising a round tube screw conveyor, the round tube screw conveyor being connected to the biomass pyrolysis furnace, the round tube screw conveyor comprising a housing (8), a first screw shaft (6), a first screw blade (7) and a first driving assembly (3) for driving the first screw shaft (6) to rotate, characterized in that: A first spiral shaft (6) is arranged in the horizontal direction in the shell (8), the first spiral blades (7) are wound on the first spiral shaft (6) located at both ends of the shell (8), and the first spiral blades (7) wound at both ends of the first spiral shaft (6) are discontinuous, and a compacting area (9) is formed between the first spiral shaft (6) located between the first spiral blades (7) at both ends and the shell (8), and the compacting area (9) is used to squeeze the biomass raw material to compact the fluffy biomass raw material; and further comprising: An inert gas delivery unit is connected to the compacting zone (9) and delivers inert gas to the compacting zone (9) to discharge air entering the compacting zone (9) and to form an air curtain in the compacting zone (9) to isolate the gas in the biomass pyrolysis furnace from being discharged to the outside; A pressure detection unit (12), which is arranged in the biomass pyrolysis furnace and is used to detect the pressure value of the biomass pyrolysis furnace during normal production; The controller is connected to the pressure detection unit (12) and is used to receive the pressure value detected by the pressure detection unit (12), and compare the detected pressure value with a set value preset in the controller. When the pressure value in the biomass pyrolysis furnace is greater than the set value, the gas supply pressure of the inert gas delivery unit is adjusted.

2. The continuous feeding sealing device of a biomass pyrolysis furnace according to claim 1, characterized in that: The length of the first spiral shaft (6) located between the first spiral blades (7) at both ends is 1.5 to 3 pitches.

3. The continuous feeding sealing device of a biomass pyrolysis furnace according to claim 1, characterized in that: The gap between the first spiral blade (7) and the inner wall of the housing (8) is 5 mm to 10 mm.

4. The continuous feeding sealing device of a biomass pyrolysis furnace according to claim 1, characterized in that: The distance between two adjacent spiral blades is 100 mm to 300 mm.

5. The continuous feeding sealing device of a biomass pyrolysis furnace according to claim 2, characterized in that: The shell (8) is provided with a material bin body (1) with a reduced diameter, and a feeding mechanism (2) for compacting biomass raw materials is provided in the material bin body (1), and the feeding mechanism (2) includes a second screw shaft, and the second screw shaft is vertically arranged in the material bin body (1), and the top of the second screw shaft is connected to the second driving member through a gear transmission, and a second screw blade matching the material bin body (1) with a reduced diameter is wound around the second screw shaft.

6. The continuous feeding sealing device of a biomass pyrolysis furnace according to claim 2, characterized in that: Two obliquely arranged pressing rods are also sleeved and fixed on the second spiral shaft located above the top of the second spiral blade, and the bottom end of each pressing rod abuts against the inner wall of the material bin body (1).

7. The continuous feeding sealing device of a biomass pyrolysis furnace according to claim 1, characterized in that: The inert gas delivery unit comprises an inert gas supply component and at least one inert gas interface (11), wherein each inert gas interface (11) is arranged on a shell (8) located at a dense area (9), each inert gas interface (11) corresponds to and is connected to a vent hole (10) provided on the shell (8), and the inert gas supply component is connected to each inert gas interface (11).

8. The continuous feeding sealing device of a biomass pyrolysis furnace according to claim 7, characterized in that: The inert gas interface (11) is provided in a plurality, and the plurality of inert gas interfaces (11) are evenly distributed on the shell (8) along the circumference of the dense area (9) outside the shell (8).

9. The continuous feeding sealing device of a biomass pyrolysis furnace according to claim 1, characterized in that: The inert gas is nitrogen.

10. The sealing method of the continuous feeding sealing device of the biomass pyrolysis furnace according to claim 1, characterized in that: The steps include: The biomass raw material is fed into the circular tube screw conveyor, and the circular tube screw conveyor rotates, and the biomass raw material is squeezed under the drive of the first spiral blade (7), so that the biomass raw material moves from the direction of the circular tube screw conveyor feed port to the direction of the circular tube screw conveyor discharge port; When the biomass raw material moves to the compacting zone (9), the biomass raw material is squeezed to compact the fluffy biomass raw material; The pressure value in the biomass pyrolysis furnace is detected by a pressure detection unit (12). When the pressure value in the biomass pyrolysis furnace is greater than a preset value in a controller, the pressure of the gas supplied to the dense zone (9) by the inert gas delivery unit is adjusted so that the air entering the dense zone (9) is discharged and a gas curtain is formed in the dense zone (9) to isolate the gas in the biomass pyrolysis furnace from being discharged.

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