Biomass particle combustion heating furnace

Abstract

The invention relates to the technical field of biomass combustion furnaces, and discloses a biomass particle combustion heating furnace. According to the biomass particle drying device, on the basis that biomass particles are turned over through an original heating drying pipe for drying, the interval between a magnetic piston shaft and a magnetic strip is changed through the turning action, and the magnetic piston shaft is promoted to do piston motion in the drying pipe in cooperation with magnetic attraction force between the magnetic piston shaft and the magnetic strip; and finally, through one-way circulation of a first one-way valve and a second one-way valve, a heat energy recovery pipe and a heat preservation box, smoke in an external smoke exhaust pipe on the combustion furnace body is sucked into the heat conduction pipe after being filtered, and the smoke is exhausted into a storage bin. And the effect of more fully drying the biomass particles accumulated in the storage bin is achieved, and meanwhile the heat energy recovery efficiency and the drying efficiency are improved.

Description

Technical Field

[0001] This application relates to the technical field of biomass combustion stoves, and particularly to a biomass pellet combustion heating stove. Background Art

[0002] In rural areas of northern China, due to the cold climate, in order to achieve a good heating environment in residents' families, some combustion heating stoves of different models will be purchased for heating. Most of the early combustion heating stoves used easily combustible materials such as straw or wood as the combustion source for combustion. However, with the country's strong promotion of the concept of green environmental protection, biomass fuels have gradually been developed and born in the market. Among them, biomass pellets formed by compressing materials such as wood and straw are widely accepted by people. The compressed biomass pellets have the characteristics of being resistant to combustion, burning fully, and having little smoke during the combustion process, meeting the requirements of energy conservation and environmental protection, and are widely used in fields such as household heating and food processing.

[0003] Before using a biomass pellet combustion heating stove, a sufficient amount of dry biomass pellets need to be added to the feeding bin to facilitate the automatic feeding of the heating stove through the spiral feeding rod. However, the existing biomass pellet combustion heating stoves lack pre-drying treatment for the input materials. As a result, during the feeding process, if the previously prepared biomass pellets become wet during storage, the moisture infiltrating into the fuel will absorb heat and evaporate during the fuel combustion process, consuming a large amount of heat energy, reducing the combustion temperature, and ultimately affecting the combustion heating effect of the heating stove. In addition, the wet fuel is extremely likely to be squeezed and adhered to other biomass pellets during feeding, resulting in blockage at the feeding port, causing the feeding port to have poor feeding or even complete inability to feed. Summary of the Invention

[0004] This application proposes a biomass pellet combustion heating stove, which has the advantage that by controlling the forward and reverse free rotation of the output shaft of the motor, multiple arrays of drying tubes can be made to turn over the surrounding covered biomass pellets, thereby further increasing the drying area and drying effect of the biomass pellets. The action of the output shaft of the motor driving the heat conduction tube and multiple drying tubes to deflect and turn over left and right can also separate the adhered biomass pellets by physical external force, reducing the probability of adhesion of the biomass pellets. This is used to solve the problem that the existing biomass pellet combustion heating stoves lack pre-drying treatment for the input materials, resulting in the fact that during the feeding process, if the previously prepared biomass pellets become wet during storage, they are extremely likely to be squeezed and adhered to other biomass pellets during feeding, causing blockage at the feeding port, resulting in poor feeding at the feeding port or even complete inability to feed at the feeding port.

[0005] To achieve the above object, the present application adopts the following technical solutions: A biomass pellet combustion heating furnace, including a combustion furnace body for burning biomass pellets and a motor. A storage bin is provided at the top of the combustion furnace body. A spiral feeding rod for feeding materials to the combustion chamber is provided at the bottom of the storage bin. A heat recovery pipe is connected to the external flue gas discharge pipe of the combustion furnace body at one end. The other end of the heat recovery pipe penetrates through the bottom and is connected to a heat preservation box. Heat conduction blocks adapted to the heat preservation box are provided on the inner wall of the storage bin, and the heat preservation box is inserted into the heat conduction blocks. The motor is installed on the outer wall of the combustion furnace body. The output shaft of the motor penetrates through the combustion furnace body and is fixedly connected to a heat conduction pipe. The end of the heat conduction pipe away from the motor penetrates through the heat preservation box and is rotatably connected to the heat preservation box. An installation sleeve is sleeved outside the heat conduction pipe, and a plurality of drying pipes distributed in an array are fixedly connected to both the left and right sides of the installation sleeve. The end of the drying pipe penetrates through the installation sleeve and the heat conduction pipe and is connected to the inner cavity of the heat conduction pipe.

[0006] A sealing baffle is provided on the central vertical line of the heat recovery pipe, and both the upper and lower surfaces of the sealing baffle are fixedly connected to the inner wall of the heat conduction pipe cavity. Sealing blocks for closing the heat conduction pipe are fixedly connected to both ends of the inner wall of the heat conduction pipe, and the opposite sides of the sealing blocks are respectively fixedly connected to both ends of the sealing baffle. Two first one-way valves communicating with the inner cavity of the heat conduction pipe are embedded in the sealing block located in the heat preservation box. The two first one-way valves respectively correspond to the two independent sealed cavities of the heat conduction pipe separated by the sealing baffle. Two outwardly inclined slopes are provided on the outer surfaces of both the upper and lower sides of the installation sleeve, and a strip-shaped air jet box is fixedly installed on each slope. The four strip-shaped air jet boxes penetrate through the installation sleeve and the heat conduction pipe and are connected to the inner cavity of the heat conduction pipe. A second one-way valve for unidirectional flow of hot air is provided in each strip-shaped air jet box. The end of the drying pipe away from the installation sleeve is in a closed state, and a spring is fixedly connected to the inner wall. One end of the spring close to the installation sleeve is fixedly connected to a magnetic piston shaft, and the magnetic piston shaft is piston-connected in the drying pipe. Magnetic strips with opposite magnetic poles to the magnetic piston shaft are fixedly installed on both sides of the inner wall of the storage bin near the drying pipe.

[0007] One end of the heat recovery pipe located in the external flue gas discharge pipe of the combustion furnace body is fixedly connected to a heat conduction joint. The shape of the heat conduction joint is semi-cylindrical, and a plurality of through holes communicating with the inner cavity of the heat recovery pipe are provided on the surface. A protective cover for preventing dust and foreign objects is fixedly sleeved on the heat conduction joint.

[0008] A through groove is provided at the top of the heat conduction joint, and an air filter element for filtering flue gas dust is clamped and fixed in the through groove.

[0009] An annular heat conduction box is fixedly sleeved at the end of the heat conduction pipe located in the heat preservation box, and a heat preservation material with a high heat preservation coefficient is filled in the annular heat conduction box.

[0010] The annular heat-conducting box is made of a metal material with a high heat conductivity coefficient.

[0011] A certain gap is provided between the first one-way valve and the inner wall of the heat preservation box.

[0012] Above the annular heat-conducting box, a plurality of heat-conducting blocks for enhancing the heat absorption capacity of the heat preservation box are provided, and the plurality of heat-conducting blocks are fixedly connected to the inner wall of the heat preservation box.

[0013] The heat-conducting pipe, the mounting sleeve and the drying pipe are all made of a non-magnetic metal material with a relatively high heat conductivity coefficient.

[0014] A cover plate is installed on the top of the storage bin, and a handle convenient for grasping is fixedly connected to the cover plate. A plurality of exhaust grooves distributed in an array are opened on the cover plate.

[0015] The beneficial effects of the present invention are as follows:

[0016] A biomass pellet combustion heating stove provided by the present application can achieve the turning of biomass pellets covered by drying tubes in multiple array parts by controlling the forward and reverse free rotation of the output shaft of the motor, thereby further increasing the drying area and drying effect of the biomass pellets. Moreover, the action of the output shaft of the motor driving the heat conduction tube and multiple drying tubes to deflect and turn left and right reciprocally can also separate the adhered biomass pellets by physical external force, reducing the probability of adhesion of the biomass pellets, facilitating the dry biomass pellets to pass through the feeding port, and avoiding the problem of blockage at the feeding port. In addition, on the basis of the drying effect of the originally heated drying tubes turning the biomass pellets, the turning action is utilized to change the distance between the magnetic piston shaft and the magnetic strip. With the magnetic attraction force between the magnetic piston shaft and the magnetic strip, the magnetic piston shaft is promoted to perform a piston movement in the drying tube, driving the air pressure change in the independent sealed cavity of the heat conduction tube. Finally, through the one-way flow of the first one-way valve and the second one-way valve and the heat energy recovery tube and the heat preservation box, the flue gas in the external flue gas discharge tube of the combustion furnace body is filtered and then inhaled into the heat conduction tube and discharged into the storage bin, achieving a more sufficient drying effect on the biomass pellets piled up in the storage bin, while improving the heat energy recovery efficiency and drying efficiency. Since there are two sets of drying tubes and the related mechanisms causing the above-mentioned air pressure change, and they are distributed on both sides of the installation sleeve, when the heat conduction tube drives the drying tubes on both sides of the installation sleeve to deflect left and right reciprocally, the effect is that when the drying tube at the far end is far away from the magnetic strip, the pressure in the independent sealed space on one side of the corresponding heat conduction tube increases, and hot air is ejected from the corresponding installation sleeve, while the independent sealed cavity in the other heat conduction tube starts to absorb hot air. As the left and right reciprocating movement continues, the strip-shaped jet boxes on both sides of the installation sleeve will successively cooperate with the corresponding drying tubes to turn the piled-up biomass pellets while ejecting hot air, thereby improving the drying effect of the continuous conduction of hot air, and solving the problem that the existing biomass pellet combustion heating stove lacks pre-drying treatment of the input materials, resulting in the problem that if the previously prepared biomass pellets are damp during storage, they are extremely likely to be squeezed and adhered to other biomass pellets during feeding, causing blockage at the feeding port, resulting in unsmooth feeding at the feeding port or even complete inability to feed at the feeding port. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings:

[0018] Figure 1 It is a schematic structural diagram of the whole of the present invention;

[0019] Figure 2 Schematic diagram of the rear view structure of the present invention;

[0020] Figure 3 Schematic diagram of the sectional structure at the storage bin of the present invention;

[0021] Figure 4 Schematic diagram of the structure at the heat conduction pipe and the sealing baffle of the present invention;

[0022] Figure 5 Schematic diagram of the sectional structure at the mounting sleeve and the drying pipe of the present invention;

[0023] Figure 6 Schematic diagram of the structure at the motor, the drying pipe and the heat preservation box of the present invention;

[0024] Figure 7 Schematic diagram of the structure at the mounting sleeve, the drying pipe and the magnetic strip of the present invention;

[0025] Figure 8 Schematic diagram of the sectional structure at the heat preservation box of the present invention;

[0026] Figure 9 Schematic diagram of the sectional structure at the strip-shaped air jet box of the present invention;

[0027] Figure 10 Schematic diagram of the structure at the heat energy recovery pipe, the heat conduction joint and the protective cover of the present invention.

[0028] In the figure: 1. Combustion furnace body; 2. Storage bin; 201. Cover plate; 3. Heat energy recovery pipe; 301. Heat conduction joint; 302. Protective cover; 303. Air filter element; 304. Annular heat conduction box; 305. Heat preservation box; 306. Heat conduction block; 4. Motor; 401. Heat conduction pipe; 402. Mounting sleeve; 403. Drying pipe; 5. Sealing baffle; 501. First one-way valve; 502. Strip-shaped air jet box; 503. Second one-way valve; 504. Magnetic piston shaft; 505. Spring; 506. Sealing block; 507. Magnetic strip. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment 1

[0031] Please refer to as Figures 1 - 10, when the device is in use, it is necessary to first open the cover plate 201 installed on the top of the storage bin 2 and put the biomass particles to be burned with the belt into the storage bin 2 for standby. During the combustion of biomass, the heat in the flue gas generated will be conducted into the heat preservation box 305 through the heat energy recovery pipe 3 connected to the external flue gas discharge pipe on the combustion furnace body 1. Also, because one end of the heat conduction pipe 401 penetrates and is rotatably connected in the heat preservation box 305, the heat entering the heat preservation box 305 will then be conducted into the heat conduction pipe 401. Since the outer surface of the heat conduction pipe 401 is sleeved and fixedly connected with an installation sleeve 402, and both sides of the installation sleeve 402 are fixedly connected with a plurality of drying pipes 403. One end of these drying pipes 403 fixedly connected to the installation sleeve 402 sequentially penetrates the installation sleeve 402 and the heat conduction pipe 401 and is connected to the inner cavity of the heat conduction pipe 401. Thus, part of the heat energy in the flue gas generated by the combustion of biomass particles in the combustion furnace body 1 is finally recovered by heat energy into the storage bin 2. Under the uniform arrangement of the plurality of drying pipes 403, the biomass particles in the storage bin 2 are uniformly heated and dried, accelerating the evaporation of the moisture in the biomass particles in the storage bin 2. The evaporated moisture follows the air and is discharged through a plurality of exhaust grooves opened on the cover plate 201, improving the drying effect in the storage bin 2 and reducing the risk that the wet biomass particles are bonded together during mutual extrusion and block the feeding port. One end of the heat conduction pipe 401 is fixedly connected to the output shaft of the motor 4 fixedly installed outside the combustion furnace body 1, so that it can freely deflect at different angles in the left, right, up and down directions driven by the output shaft of the motor 4. During this process, by controlling the output shaft of the motor 4 to rotate freely in the forward and reverse directions, the drying pipes 403 in multiple array parts can be made to turn over the biomass particles covered around them, thereby further increasing the drying area and drying effect on the biomass particles. The action of the output shaft of the motor 4 driving the heat conduction pipe 401 and a plurality of drying pipes 403 to deflect and turn over left and right reciprocally can also separate the bonded biomass particles by physical external force, reducing the probability of the biomass particles being bonded together and facilitating the biomass particles to pass through the feeding port while keeping dry, avoiding the problem of blockage of the feeding port.

[0032] In addition, by fixedly connecting a heat conduction joint 301 to one end of the heat energy recovery pipe 3 located inside the flue gas discharge pipe outside the combustion furnace body 1, and setting the shape of the heat energy recovery pipe 3 as a semi-cylindrical shape, the contact area with the heat energy in the flue gas can be increased without affecting the normal discharge of the flue gas, thereby improving the recovery efficiency of the heat energy in the flue gas, further increasing the amount of heat energy introduced into the storage bin 2, and then improving the heat drying effect on the biomass particles in the storage bin 2. The above settings achieve heat drying of the biomass particles waiting to enter the feed port in the storage bin 2 by recovering the heat energy in the flue gas normally generated during the combustion of the biomass particles, avoiding the problem that the wet particles mixed therein are bonded and agglomerated under external force extrusion in the storage bin 2, thus causing blockage of the feed port.

[0033] It should be noted that a through groove is provided at the top of the heat conduction joint 301, and an air filter element 303 for filtering flue gas dust is clamped and fixed in the through groove. This setting can reduce the problem that a large amount of particulate matter or impurities in the flue gas enter the heat energy recovery pipe 3, resulting in ash accumulation on the inner wall of the heat energy recovery pipe 3 and further reducing the heat conduction effect of the heat energy recovery pipe 3. Furthermore, a protective cover 302 is sleeved outside the heat conduction joint 301. On the one hand, the protective cover 302 can support the air filter element 303 to prevent the heat conduction joint 301 from falling, and at the same time, it can also block some large-volume foreign objects and small animals to avoid the problem of blockage of the through holes on the heat conduction joint 301.

[0034] Furthermore, a plurality of heat conduction blocks 306 for heat conduction are provided in the heat preservation box 305 to enhance the heat absorption effect in the heat preservation box 305. Cooperating with the annular heat conduction box 304 filled in the heat preservation box 305, the heat energy can be better conducted into the storage bin 2 through the end of the heat conduction pipe 401 to dry the biomass particles. The annular heat conduction box 304 is filled with a heat preservation material with a high heat preservation coefficient, which can better converge the heat in the heat preservation box 305 at the end of the heat conduction pipe 401, provide a more stable heat supply for the heat conduction pipe 401, and enhance the heat supply effect of the heat conduction pipe 401.

[0035] Embodiment 2

[0036] On the basis of Embodiment 1, a further improvement is made. Please refer to Figures 4 - 9, since the sealing blocks 506 are fixedly connected to both ends of the heat conduction tube 401, the inner cavity of the heat conduction tube 401 is a closed cavity. The only places where it can communicate with the outside are the two first one-way valves 501 on the sealing blocks within the heat preservation box 305 and the second one-way valves 503 within the four strip-shaped air jet boxes 502. Also, because the sealing baffle 5 arranged on the vertical line in the inner cavity of the heat conduction tube 401 is fixedly connected to the inner wall of the heat conduction tube 401 on both the upper and lower surfaces, the inner wall of the heat conduction tube 401 is divided into two independent sealed spaces by the sealing baffle 5 and the two sealing blocks 506. The two independent sealed spaces are respectively connected to the drying tubes 403 and the strip-shaped air jet boxes 502 on both sides of the mounting sleeve 402. During the process of the output shaft of the motor 4 driving the heat conduction tube 401, the mounting sleeve 402 and the drying tubes 403 to deflect left and right reciprocally, when the farther end of the drying tube 403 on one side of the mounting sleeve 402 gradually approaches the magnetic strip 507 fixedly connected to the bottom of the storage bin 2 as the angle of the heat conduction tube 401 deflects, the magnetic attraction force between the magnetic piston shaft 504 slidably connected within the drying tube 403 and the magnetic strip 507 gradually increases due to the distance reduction, thereby attracting the magnetic piston shaft 504 to slide within the drying tube 403 towards the magnetic strip 507. During this process, as the magnetic piston shaft 504 slides, the spring 505 fixedly connected to both ends of the magnetic piston shaft 504 and the inner wall of the end of the drying tube 403 is compressed and deformed. And because the inner cavity of the drying tube 403 is connected to the corresponding independent sealed cavity within the heat conduction tube 401, when the magnetic piston shaft 504 slides towards the magnetic strip 507, the pressure of the corresponding independent sealed cavity within the heat conduction tube 401 decreases. At this time, the channel of the first one-way valve 501 on the sealing block 506 opens, and absorbs the hot air within the external heat preservation box 305 into the corresponding negative-pressure independent sealed cavity for storage. This action can accelerate the conduction of heat energy, enabling it to spread into the drying tube 403 more quickly when the drying tube 403 deflects and flips the biomass particles, thereby enhancing the drying effect of the biomass particles around the drying tube 403. When the output shaft of the motor 4 starts to deflect in the opposite direction, the distance between the magnetic piston shaft 504 and the magnetic strip 507 increases, and the magnetic attraction force between the two weakens. At this time, the compressed spring 505 starts to elastically reset and pushes the magnetic piston shaft 504 to reset. During this process, the pressure of the corresponding independent sealed space that has inhaled a large amount of hot air increases. At this time, the second one-way valve 503 within the strip-shaped air jet box 502 opens, and discharges the internal hot air outwards through the two upper and lower strip-shaped air jet boxes 502. The discharged hot air dries the biomass particles on both the upper and lower sides of the mounting sleeve 402 respectively. On the basis of the original drying effect of the drying tube 403 that flips the biomass particles for heating, by using the flipping action to change the distance between the magnetic piston shaft 504 and the magnetic strip 507, and cooperating with the magnetic attraction force between the magnetic piston shaft 504 and the magnetic strip 507, it promotes the magnetic piston shaft 504 to perform a piston motion within the drying tube 403, driving the air pressure change within the independent sealed cavity of the heat conduction tube 401,Finally, through the one-way flow of the first one-way valve 501 and the second one-way valve 503, as well as the heat energy recovery pipe 3 and the heat preservation box 305, the flue gas in the externally connected flue gas discharge pipe on the combustion furnace body 1 is filtered and then inhaled into the heat conduction pipe 401 and discharged into the storage bin 2, achieving a more sufficient drying effect on the biomass particles accumulated in the storage bin 2. At the same time, the heat energy recovery efficiency and drying efficiency are improved. Since there are two sets of drying pipes 403 and the related mechanisms causing air pressure changes mentioned above, and they are distributed on both sides of the installation sleeve 402, when the heat conduction pipe 401 drives the drying pipes 403 on both sides of the installation sleeve 402 to deflect left and right reciprocally, the effect is that when the farther end of the drying pipe 403 is away from the magnetic strip 507, the pressure in the independent sealed space on one side of the corresponding heat conduction pipe 401 increases, and hot air is ejected from the corresponding installation sleeve 402, while the independent sealed cavity in the other side of the heat conduction pipe 401 starts to absorb hot air. As the left and right reciprocating motion continues, the strip-shaped air jet boxes 502 on both sides of the installation sleeve 402 will cooperate with the corresponding drying pipes 403 to turn the accumulated biomass particles and eject hot air at the same time, thereby improving the drying effect of continuous heat conduction of hot air.

[0037] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A biomass pellet combustion heating stove, characterized in that, Comprising: A combustion furnace body (1) for burning biomass pellets. A storage bin (2) is provided at the top of the combustion furnace body (1), and a spiral feeding rod for feeding materials into the combustion chamber is arranged at the bottom of the storage bin (2); A heat energy recovery pipe (3) communicated with a flue gas discharge pipe externally connected to the combustion furnace body (1). One end bottom of the heat energy recovery pipe (3) is connected through and communicated with a heat preservation box (305). A heat conduction block (306) adapted to the heat preservation box (305) is provided on the inner wall of the storage bin (2), and the heat preservation box (305) is inserted into the heat conduction block (306); A motor (4) installed on the outer wall of the combustion furnace body (1). The output shaft of the motor (4) penetrates the combustion furnace body (1) and is fixedly connected with a heat conduction pipe (401). One end of the heat conduction pipe (401) away from the motor (4) penetrates the heat preservation box (305) and is rotatably connected with the heat preservation box (305); An installation sleeve (402) is sleeved outside the heat conduction pipe (401), and a plurality of uniformly distributed drying pipes (403) are fixedly connected to both the left and right sides of the installation sleeve (402). The end of the drying pipe (403) penetrates the installation sleeve (402) and the heat conduction pipe (401) and is communicated with the inner cavity of the heat conduction pipe (401).

2. The biomass pellet combustion heating stove according to claim 1, characterized in that, A sealing baffle (5) is arranged on the central vertical line of the heat energy recovery pipe (3), and both the upper and lower surfaces of the sealing baffle (5) are fixedly connected with the inner cavity wall of the heat conduction pipe (401). Sealing blocks (506) for closing the heat conduction pipe (401) are fixedly connected to both ends of the inner wall of the heat conduction pipe (401), and the opposite sides of the sealing blocks (506) are respectively fixedly connected to both ends of the sealing baffle (5). Two first one-way valves (501) communicated with the inner cavity of the heat conduction pipe (401) are embeddedly installed on the sealing block (506) located in the heat preservation box (305). The two first one-way valves (501) respectively correspond to two independent sealed cavities of the heat conduction pipe (401) separated by the sealing baffle (5). Two outwardly inclined slopes are arranged on both the upper and lower outer surfaces of the installation sleeve (402), and a strip-shaped jet box (502) is fixedly installed on each slope. The four strip-shaped jet boxes (502) respectively penetrate the installation sleeve (402) and the heat conduction pipe (401) and are communicated with the inner cavity of the heat conduction pipe (401). A second one-way valve (503) for unidirectional flow of hot air is arranged in each strip-shaped jet box (502). The end of the drying pipe (403) away from the installation sleeve (402) is in a closed state, and a spring (505) is fixedly connected to the inner wall. One end of the spring (505) close to the installation sleeve (402) is fixedly connected with a magnetic piston shaft (504), and the magnetic piston shaft (504) is piston-connected in the drying pipe (403). Magnetic strips (507) with magnetic poles opposite to those of the magnetic piston shaft (504) are fixedly installed on both sides of the inner wall of the storage bin (2) near the drying pipe (403).

3. A biomass pellet combustion heating stove according to claim 1, characterized in that, One end of the heat energy recovery pipe (3) located inside the flue gas discharge pipe externally connected to the combustion furnace body (1) is fixedly connected with a heat conduction joint (301). The heat conduction joint (301) is in the shape of a semi-cylindrical body, and a plurality of through holes communicating with the inner cavity of the heat energy recovery pipe (3) are formed on the surface. A protective cover (302) for dust and foreign object prevention is fixedly sleeved on the heat conduction joint (301).

4. A biomass pellet combustion heating stove according to claim 3, characterized in that, A through groove is formed at the top of the heat conduction joint (301), and an air filter element (303) for filtering flue gas dust is fixedly clamped in the through groove.

5. A biomass pellet combustion heating stove according to claim 4, characterized in that, An end of the heat conduction pipe (401) located inside the heat preservation box (305) is fixedly sleeved with an annular heat conduction box (304), and a heat preservation material is filled in the annular heat conduction box (304).

6. The biomass pellet combustion heating stove according to claim 5, characterized in that, The annular heat conduction box (304) is made of a metal material with a high heat conduction coefficient.

7. A biomass pellet combustion heating stove according to claim 2, characterized in that, A gap is provided between the first one-way valve (501) and the inner wall of the heat preservation box (305).

8. A biomass pellet combustion heating stove according to claim 5, characterized in that, A plurality of heat conduction blocks (306) for enhancing the heat absorption capacity of the heat preservation box (305) are arranged above the annular heat conduction box (304), and the plurality of heat conduction blocks (306) are fixedly connected with the inner wall of the heat preservation box (305).

9. A biomass pellet combustion heating stove according to claim 1, characterized in that, The heat conduction pipe (401), the mounting sleeve (402) and the drying pipe (403) are all made of a non-magnetic metal material with a relatively high heat conduction coefficient.

10. A biomass pellet combustion heating stove according to claim 1, characterized in that, A cover plate (201) is installed on the top of the storage bin (2), and a handle convenient for grasping is fixedly connected to the cover plate (201). A plurality of exhaust grooves distributed in an array are formed on the cover plate (201).

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