A detachable multi-layered sleeve biomass stove

Abstract

This application relates to the field of combustion equipment, and in particular to a detachable multi-layered sleeve biomass furnace, comprising a barrel body, within which is a furnace core assembly consisting of at least two layers of furnace core sleeves of different specifications. An air inlet is located at the bottom of the barrel body. The outermost furnace core sleeve is fixed inside the barrel body, serving as a combustion chamber, providing air intake, and acting as an insulation layer. The remaining furnace core sleeves are detachable and nested. Each layer of furnace core sleeve has primary and secondary air inlets at both ends, allowing external air to enter and participate in combustion in two separate paths. The primary and secondary air inlets are evenly distributed along the circumference of the furnace core sleeves, and the furnace core sleeve openings have a constricted structure. The barrel body includes an outer barrel and a middle barrel. The outer barrel has a furnace surface, furnace bottom, furnace feet, and a barrel body panel, and a handle is located on the outer barrel. A rotating plate with adjustment holes and a lever at the air inlet allows for adjustment of the air intake area. This application achieves the technical effects of complete fuel combustion, easy disassembly and maintenance of the furnace core sleeves, and flexible adjustment of the air intake area.

Description

Technical Field

[0001] This application relates to the field of combustion equipment, and in particular to a biomass furnace with a detachable multi-layer sleeve. Background Technology

[0002] Biomass stoves, as common combustion equipment, are widely used in both household and industrial sectors. With increasing societal demands for environmental protection and growing focus on energy efficiency, biomass stove technology is gradually evolving towards high-efficiency combustion and low emissions. This trend not only aligns with current green environmental protection concepts but also holds significant importance for the effective utilization of resources. High-efficiency combustion means fully utilizing the energy of fuel and reducing energy waste; low emissions help reduce environmental pollution and improve air quality. This drives continuous innovation and progress throughout the combustion equipment industry, prompting companies to increase R&D investment and explore more advanced biomass stove technologies to meet market and societal demands.

[0003] In the past, most biomass stoves on the market adopted a single-chamber combustion chamber design. In this design, fuel is directly placed in a single combustion chamber for combustion. Fuel addition and management relied primarily on manual operation, lacking precise control methods. Simultaneously, air supply was also rudimentary, typically relying on natural ventilation or simple vents to allow air to enter the combustion chamber, making it impossible to adjust the airflow in real time according to combustion conditions. Furthermore, the exhaust gas generated during combustion was treated simply, mostly being directly emitted into the air. This traditional design makes it difficult for fuel to achieve complete combustion; much of the energy in the fuel is not fully released before being expelled, resulting in low thermal efficiency. Moreover, due to incomplete combustion, emissions contain more harmful substances such as carbon monoxide and particulate matter, posing certain hazards to the environment and human health.

[0004] However, the existing single-chamber design of biomass stoves has significant drawbacks. Because this design cannot achieve complete fuel combustion, its thermal efficiency is low, resulting in substantial energy waste and increased operating costs. Simultaneously, the emissions contain a large amount of harmful substances, polluting the environment and failing to meet current environmental protection and energy conservation requirements. This traditional design can no longer meet the demand for efficient and clean combustion and urgently needs improvement. Utility Model Content

[0005] The purpose of this application is to provide a biomass furnace with a detachable multi-layer sleeve.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution: a detachable multi-layer sleeve biomass furnace, including a barrel body, a furnace core assembly inside the barrel body, and an air inlet at the bottom of the barrel body; the furnace core assembly includes at least two layers of furnace core sleeves of different specifications, wherein the outermost furnace core sleeve is fixed inside the barrel body and serves as a combustion chamber, provides air intake, and acts as a heat insulation layer, while the remaining furnace core sleeves are detachably nested layer by layer inside the outermost furnace core sleeve; each furnace core sleeve has a primary air intake at one end near the air inlet. The furnace has a secondary air inlet at the end furthest from the main air inlet. After entering through the main air inlet, external air rises along the annular air duct formed between the barrel body and the outermost furnace core sleeve, and is divided into two airflows. The first airflow enters the corresponding furnace core sleeve through the primary air inlet of each furnace core sleeve, and participates in the initial combustion of fuel as primary air. The second airflow continues to rise along the annular air duct, and enters the corresponding furnace core sleeve through the secondary air inlet of each furnace core sleeve, and serves as secondary air to perform secondary combustion of the combustible components in the combustion exhaust gas.

[0007] By adopting the above technical solution, external air enters through the air inlet at the bottom of the barrel, rises along the annular air duct between the barrel and the outermost furnace core sleeve, and is divided into two airflows. The first airflow participates in the initial combustion of fuel through the primary air inlet, and the second airflow performs secondary combustion of the combustible components in the combustion exhaust gas through the secondary air inlet. This achieves staged air intake and secondary combustion, effectively improving fuel combustion efficiency and reducing emissions of pollutants such as carbon monoxide. In the at least two layers of furnace core sleeves of different specifications, the outermost layer is fixed and also functions as a combustion chamber, providing air intake and heat insulation, while the rest are designed to be detachable and nested. This design allows for flexible replacement of different sleeve sizes in the furnace core assembly according to actual needs. It not only adapts to different fuel types and combustion conditions but also facilitates user disassembly and replacement of the furnace core sleeve and dumping and cleaning of ash inside the furnace, significantly improving the convenience and practicality of using the biomass furnace. At the same time, the annular air duct structure formed between the barrel and the furnace core sleeve provides a stable upward path for air, ensuring that secondary air can enter the furnace core sleeve evenly and sufficiently, further optimizing the combustion process. This makes the biomass furnace perform excellently in terms of high-efficiency combustion, energy saving and environmental protection, and ease of operation.

[0008] Optionally, there are multiple primary air inlets, which are evenly arranged along the circumference of the furnace core sleeve; there are also multiple secondary air inlets, which are evenly arranged along the circumference of the furnace core sleeve.

[0009] By adopting the above technical solution, the primary and secondary air inlets are uniformly arranged along the circumference of the furnace core sleeve, enabling primary and secondary air to enter the furnace core sleeve in a symmetrical and balanced manner, forming a uniform airflow field surrounding the fuel and avoiding incomplete combustion caused by local oxygen deficiency or excess. The multiple circumferentially distributed air inlets increase the contact area between air, fuel, and combustion exhaust gas, promoting thorough mixing of primary air and fuel to achieve initial combustion stability. At the same time, it allows secondary air to uniformly encapsulate the combustible components in the combustion exhaust gas, improving the reaction efficiency of secondary combustion and further reducing the generation of pollutants such as carbon monoxide and hydrocarbons. In addition, the uniformly distributed air inlet structure facilitates processing and standardized production and can adapt to the cylindrical structure of the furnace core sleeve, ensuring that the airflow is covered without dead angles in the circumference. This improves the uniformity, completeness, and stability of the biomass furnace combustion process as a whole, achieving the technical effect of efficient and clean combustion.

[0010] Optionally, the furnace core sleeve has a constricted opening structure that is radially inclined inward at the opening.

[0011] By adopting the above technical solution, the radially inwardly inclined constriction structure at the furnace core sleeve opening guides the airflow generated by combustion towards the center, forming a converging effect. This concentrates the flame and high-temperature gas inside the sleeve, increasing the temperature of the combustion zone and extending the gas residence time, thereby promoting complete fuel combustion and secondary reactions of combustible components in the combustion exhaust gas. Simultaneously, the constriction structure alters the airflow direction, causing strong turbulent mixing between secondary air and combustion exhaust gas near the constriction, increasing the contact area between the two and further improving secondary combustion efficiency, effectively reducing emissions of pollutants such as carbon monoxide and particulate matter. Furthermore, the constriction structure optimizes the furnace surface space, ensuring the required installation area for furnace nails. The constriction structure reinforces and guides the airflow at the sleeve opening, preventing direct scouring of the opening by high-temperature airflow, extending the service life of the furnace core sleeve. The inwardly inclined design is compatible with the cylindrical structure of the sleeve, ensuring uniform airflow contraction and convergence, and optimizing overall combustion performance.

[0012] Optionally, the barrel body includes an outer barrel and a middle barrel arranged sequentially from the outside to the inside. The top of the outer barrel is provided with a furnace surface, and the furnace surface is provided with a number of furnace nails. The bottom of the outer barrel is provided with a furnace bottom, and the furnace bottom is provided with a number of furnace feet. One side of the outer barrel is a flat structure and is connected to a barrel body panel, and the other side is an arc-shaped structure. The flat structure and the arc-shaped structure are smoothly transitioned.

[0013] By adopting the above technical solutions, the layered design of the outer and middle buckets provides a stable installation space for the furnace core assembly. At the same time, the furnace surface and furnace nails at the top of the outer bucket can reliably support cooking utensils. The placement of the furnace nails can prevent the utensils from sliding or uneven heat conduction caused by direct contact with the furnace surface, thus improving safety. The furnace bottom and furnace feet at the bottom of the outer bucket work together to allow the biomass stove to be placed stably on different ground surfaces. The placement of the furnace feet can also effectively isolate the high temperature of the furnace bottom from the surface on which it is placed. The curved structure on one side of the outer bucket not only enhances the structural strength of the bucket body but also makes the overall shape more streamlined and beautiful. The smooth transition between the flat and curved surfaces reduces airflow resistance and dust accumulation dead corners, while avoiding stress concentration on the bucket structure. This optimizes the biomass stove in terms of functionality, practicality, and structural stability.

[0014] Optionally, the outer barrel is provided with a handle.

[0015] By adopting the above technical solution, the handle on the outer barrel provides users with a convenient point of force to move the biomass stove, ensuring that the biomass stove is evenly stressed during movement and avoiding the risk of slipping or burns that may occur from directly gripping other parts of the barrel. The handle is particularly convenient for adjusting the position or storing the biomass stove after it has cooled down, improving the flexibility of the biomass stove in outdoor use and home transport scenarios. In addition, the handle can be made of heat-insulating material or have a special structural design to further enhance the safety of use.

[0016] Optionally, a rotating plate is rotatably provided at the air inlet of the barrel body, and an adjustment hole is correspondingly opened on the rotating plate. The shape of the adjustment hole is adapted to the air inlet. The rotating plate changes the overlapping area of ​​the adjustment hole and the air inlet by rotating, thereby adjusting the air intake area of ​​the air inlet.

[0017] By adopting the above technical solution, the rotating plate and adjustment hole design at the air inlet of the barrel can adjust the overlapping area of ​​the air inlet through rotation, thereby precisely controlling the amount of air entering the biomass stove. This allows the combustion process to flexibly adjust the air intake intensity according to the fuel type (such as wood, straw, and wood chips), combustion stage (such as ignition and stable combustion), or usage requirements (such as high-heat stir-frying and low-heat simmering), effectively avoiding the problem of unstable combustion efficiency caused by the fixed air inlet of traditional biomass stoves. The structural design of the adjustment hole matching the shape of the air inlet ensures the sealing of the air intake path and the smoothness of the adjustment process. When the air intake area is increased, sufficient air can be provided to support the vigorous combustion of fuel, and when the air intake area is reduced, the combustion rate can be reduced to save fuel, achieving fine control of combustion power. At the same time, the adjustment structure is easy to operate. Users can adjust it in real time by rotating the rotating plate without the aid of tools, which significantly improves the convenience and adaptability of using the biomass stove. Furthermore, by reasonably controlling the air intake, it can further promote the complete combustion of fuel and reduce the emission of pollutants such as carbon monoxide and soot, combining the dual technical advantages of energy saving, environmental protection, and flexible control.

[0018] Optionally, the rotating plate is provided with a lever.

[0019] By adopting the above technical solution, the lever on the rotating plate provides users with a clear force-applying component for adjusting the air intake area. Users can easily drive the rotating plate to rotate by moving the lever, without directly contacting the high-temperature barrel or laboriously touching the edge of the rotating plate, significantly improving the convenience and safety of operation. The lever makes the rotation more stable and controllable, especially when fine adjustment of the air intake is required. A small rotation of the lever can achieve precise changes in the overlapping area, avoiding slippage or over-adjustment problems that may occur with manual operation. In addition, the surface of the lever can be equipped with anti-slip textures or heat insulation structures to further enhance the operating experience. This allows the biomass furnace to quickly and accurately adjust the air intake intensity according to actual needs during combustion, ensuring that the combustion state is always in a highly efficient and stable range. Thus, while improving the convenience of user operation, it indirectly optimizes the combustion control accuracy and overall performance of the biomass furnace.

[0020] In summary, this application has at least the following beneficial effect: 1. External air enters through the air inlet at the bottom of the barrel, rises along the annular air duct between the barrel and the outermost furnace core sleeve, and is divided into two airflow paths. The first path participates in the initial combustion of fuel through the primary air inlet, and the second path undergoes secondary combustion of combustible components in the combustion exhaust gas through the secondary air inlet. This achieves staged air intake and secondary combustion, effectively improving fuel combustion efficiency and reducing emissions of pollutants such as carbon monoxide. The furnace core sleeve, with at least two layers of different specifications, has an outermost fixed layer that also functions as a combustion chamber, providing air intake and insulation. The remaining layers are designed to be detachable and nested, allowing the furnace core to... The components can be flexibly replaced with different specifications of sleeves according to actual needs, which can not only adapt to different fuel types and combustion conditions, but also facilitate users to disassemble and replace the furnace core sleeve and dump and clean the ash inside the furnace, significantly improving the convenience and practicality of using the biomass furnace; at the same time, the annular air duct structure formed between the barrel and the furnace core sleeve provides a stable upward path for air, ensuring that secondary air can enter the furnace core sleeve evenly and sufficiently, further optimizing the combustion process, so that the biomass furnace performs excellently in terms of high-efficiency combustion, energy saving and environmental protection, and ease of operation.

[0021] 2. The radially inwardly inclined constriction structure at the furnace core sleeve opening guides the airflow generated by combustion towards the center, creating a converging effect. This concentrates the flame and high-temperature gas inside the sleeve, increasing the temperature of the combustion zone and extending the gas residence time, thereby promoting complete fuel combustion and secondary reactions of combustible components in the combustion exhaust gas. Simultaneously, the constriction structure alters the airflow direction, causing strong turbulent mixing of secondary air and combustion exhaust gas near the constriction, increasing the contact area between the two and further improving secondary combustion efficiency, effectively reducing emissions of pollutants such as carbon monoxide and particulate matter. Furthermore, the constriction structure reinforces and guides the sleeve opening, preventing direct scouring of the opening by high-temperature airflow, extending the service life of the furnace core sleeve. The inwardly inclined design also matches the cylindrical structure of the sleeve, ensuring uniform airflow contraction and convergence, optimizing overall combustion performance.

[0022] 3. The rotating blade and adjustment hole design at the air inlet of the barrel allows for precise control of the air volume entering the biomass stove by adjusting the overlapping area of ​​the air inlet through rotation. This enables flexible adjustment of the air intake intensity based on fuel type (e.g., wood, straw, and wood chips), combustion stage (e.g., ignition, stable combustion), or usage requirements (e.g., high-heat stir-frying, low-heat simmering), effectively avoiding the unstable combustion efficiency problem caused by the fixed air inlet of traditional biomass stoves. The structural design of the adjustment hole matching the shape of the air inlet ensures the sealing of the air intake path and the smoothness of the adjustment process. Increasing the air intake area provides sufficient air to support vigorous fuel combustion, while decreasing the air intake area reduces the combustion rate to save fuel, achieving precise control of combustion power. At the same time, this adjustment structure is easy to operate; users can adjust it in real time by rotating the blade without tools, significantly improving the convenience and adaptability of the biomass stove. Furthermore, by reasonably controlling the air intake, it can further promote complete fuel combustion and reduce emissions of pollutants such as carbon monoxide and soot, combining the dual technical advantages of energy saving, environmental protection, and flexible control. Attached Figure Description

[0023] Figure 1 This is a structural diagram of a detachable multi-layer sleeve biomass furnace; Figure 2 This is a cross-sectional view of a biomass furnace with a detachable multi-layer sleeve. Figure 3 This is an exploded view of the furnace core assembly; Figure 4 This is a structural diagram of the air inlet; Figure 5 This is a schematic diagram of the rotating plate and the lever.

[0024] Figure Labels 1. Furnace body; 101. Outer barrel; 102. Middle barrel; 103. Furnace surface; 104. Furnace nail; 105. Furnace bottom; 106. Furnace foot; 107. Furnace body panel; 108. Handle; 2. Furnace core assembly; 3. Air inlet; 4. Primary air inlet; 5. Secondary air inlet; 6. Annular air duct; 7. Narrowing structure; 11. Rotating plate; 12. Adjustment hole; 13. Lever. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the accompanying drawings.

[0026] In this embodiment, refer to Figures 1-2 A detachable multi-layer sleeve biomass furnace includes a barrel body 1 and a furnace core assembly 2, wherein the furnace core assembly 2 is disposed inside the barrel body 1, and an air inlet 3 is provided at the bottom of the barrel body 1. This arrangement allows air to enter the biomass furnace from the bottom to participate in the combustion process.

[0027] Specifically, the furnace core assembly 2 includes at least two layers of furnace core sleeves of different specifications, preferably three layers of furnace core sleeves of different specifications. The outermost furnace core sleeve is fixed inside the barrel body 1, serving as a combustion chamber, providing air intake, and acting as an insulation layer. For example, it can be made of a high-temperature resistant material with certain insulation properties, such as ceramic fiber composite material, which can withstand high-temperature combustion and reduce heat transfer from the furnace to the outside. Alternatively, it can be made of high-temperature resistant alloy steel, which has good strength and heat resistance. The remaining furnace core sleeves are detachably nested layer by layer inside the outermost furnace core sleeve. This allows users to flexibly replace furnace core sleeves of different specifications according to different usage needs. For example, when a larger combustion space is required, a larger furnace core sleeve can be selected, and smaller furnace core sleeves can be removed; conversely, when only a smaller firepower is needed, a smaller furnace core sleeve can be used.

[0028] Reference Figure 3 Each furnace core sleeve has a primary air inlet 4 at one end near the air inlet 3 and a secondary air inlet 5 at the other end. There are multiple primary air inlets 4, evenly distributed along the circumference of the furnace core sleeve. These primary air inlets 4 can be small circular holes or strip-shaped slits. They are evenly distributed around the bottom of the furnace core sleeve, allowing air to enter the furnace core sleeve uniformly and providing sufficient oxygen for the initial combustion of fuel. There are also multiple secondary air inlets 5, evenly distributed along the circumference of the furnace core sleeve. The arrangement of the secondary air inlets 5 is similar to that of the primary air inlets 4, except that they are located at the top of the furnace core sleeve. After entering through the air inlet 3, external air rises along the annular air duct 6 formed between the barrel body 1 and the outermost furnace core sleeve, and is divided into two airflow paths. The first airflow enters the corresponding furnace core sleeve through the primary air inlets 4 of each furnace core sleeve, serving as primary air for the initial combustion of fuel. The second airflow continues to rise along the annular duct 6, entering the corresponding furnace core sleeve through the secondary air inlet 5 of each layer of the furnace core sleeve. This secondary air then fuels the combustible components in the combustion exhaust gas for secondary combustion. This design significantly improves fuel combustion efficiency, allowing for more complete combustion and reducing the emission of harmful gases.

[0029] Reference Figure 2 The furnace core sleeve has a radially inwardly inclined constriction structure 7 at its opening. This constriction structure 7 can be formed by bending a metal sheet, and it is shaped like a frustum that contracts inward. It not only serves to concentrate the gas and reduce gas leakage to a certain extent, but also ensures the area of ​​the furnace surface 103 where the furnace nails 104 used to fix boilers and other items are located.

[0030] Reference Figure 1The biomass furnace body 1 includes an outer barrel 101 and a middle barrel 102 arranged sequentially from the outside in. The top of the outer barrel 101 has a furnace surface 103, on which several furnace nails 104 are provided. The furnace nails 104 can be cylindrical metal nails, vertically welded to the furnace surface 103, used to fix cookware and other items placed on the furnace surface 103. The bottom of the outer barrel 101 has a furnace bottom 105, on which several furnace feet 106 are provided. The furnace feet 106 can be triangular support feet, fixed to the furnace bottom 105 with bolts, serving to support the biomass furnace. One side of the outer barrel 101 has a flat structure connected to a barrel body panel 107, while the other side has an arc-shaped structure, with a smooth transition between the flat and arc-shaped structures. This design facilitates the assembly of components on the outer shell surface and makes the biomass furnace more aesthetically pleasing. The outer barrel 101 is also equipped with a handle 108, which can be a bent metal rod that is welded or bolted to the outer barrel 101 to facilitate the user's movement of the biomass stove.

[0031] Reference Figures 4-5 A rotating plate 11 is rotatably mounted at the air inlet 3 of the barrel body 1. An adjustment hole 12 is correspondingly provided on the rotating plate 11, the shape of which is adapted to the air inlet 3. The rotating plate 11 can be a circular metal sheet, and the adjustment hole 12 can be a circular or square hole with the same shape as the air inlet 3. The rotating plate 11 changes the overlapping area between the adjustment hole 12 and the air inlet 3 by rotating, thereby adjusting the air intake area of ​​the air inlet 3. A lever 13 is provided on the rotating plate 11. The lever 13 can be a slender metal rod welded to the edge of the rotating plate 11. The user can rotate the lever 13 to drive the rotating plate 11 to rotate, thereby controlling the air intake size of the air inlet 3. The surface of the biomass furnace can also be marked with the combustion intensity, allowing the user to more intuitively adjust the combustion intensity.

[0032] The implementation principle of this embodiment is as follows: The biomass stove features a multi-layered, detachable core sleeve design, allowing users to flexibly replace the core sleeve according to different usage needs, satisfying diverse combustion requirements. The primary air inlet 4 and secondary air inlet 5 enable secondary air intake, significantly improving fuel combustion efficiency and reducing harmful gas emissions. The constriction structure 7 both gathers the gas and ensures the surface area of ​​the stove 103. The special structural design of the outer barrel 101 facilitates component assembly and aesthetic appeal, while the handle 108 allows for easy movement of the biomass stove. The rotating plate 11 and lever 13 allow adjustment of the air inlet 3, thereby controlling the combustion intensity, and the markings provide users with a more intuitive understanding of the adjustments. This design improves the practicality, environmental friendliness, and ease of operation of the biomass stove, representing a significant improvement over traditional biomass stoves and better meeting the modern society's requirements for efficient combustion and environmental protection.

[0033] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A biomass furnace with a detachable multi-layer sleeve, characterized in that, The device includes a barrel body (1), inside which a furnace core assembly (2) is provided, and at the bottom of the barrel body (1) is an air inlet (3); the furnace core assembly (2) includes at least two layers of furnace core sleeves of different specifications, wherein the outermost furnace core sleeve is fixed inside the barrel body (1) and serves as a combustion chamber, provides air intake and heat insulation layer, and the remaining furnace core sleeves are nested in the outermost furnace core sleeve layer by layer from the outside to the inside in a detachable manner; each furnace core sleeve has a primary air inlet hole (4) at one end near the air inlet (3) and a secondary air inlet hole (4) at the other end away from the air inlet (3). The air inlet (5) allows external air to enter through the air inlet (3) and rise along the annular air duct (6) formed between the barrel body (1) and the outermost furnace core sleeve. The air is divided into two streams. The first stream enters the corresponding furnace core sleeve through the primary air inlet (4) of each furnace core sleeve and serves as primary air to participate in the initial combustion of fuel. The second stream continues to rise along the annular air duct (6) and enters the corresponding furnace core sleeve through the secondary air inlet (5) of each furnace core sleeve, serving as secondary air to perform secondary combustion of the combustible components in the combustion exhaust gas.

2. A biomass furnace with a detachable multi-layer sleeve as described in claim 1, characterized in that, The primary air inlet (4) is provided in multiple ways, and the multiple primary air inlet (4) are evenly arranged along the circumference of the furnace core sleeve; the secondary air inlet (5) is provided in multiple ways, and the multiple secondary air inlet (5) are evenly arranged along the circumference of the furnace core sleeve.

3. A biomass furnace with a detachable multi-layer sleeve according to claim 1, characterized in that, The furnace core sleeve has a constriction structure that is radially inclined inward at the opening (7).

4. A biomass furnace with a detachable multi-layer sleeve according to claim 1, characterized in that, The barrel body (1) includes an outer barrel (101) and a middle barrel (102) arranged sequentially from the outside to the inside. The top of the outer barrel (101) is provided with a furnace surface (103), and the furnace surface (103) is provided with a number of furnace nails (104). The bottom of the outer barrel (101) is provided with a furnace bottom (105), and the furnace bottom (105) is provided with a number of furnace feet (106). One side of the outer barrel (101) is a flat structure and is connected to a barrel body panel (107), and the other side is an arc surface structure. The flat structure and the arc surface structure are smoothly transitioned.

5. A biomass furnace with a detachable multi-layer sleeve according to claim 4, characterized in that, The outer barrel (101) is provided with a handle (108).

6. A biomass furnace with a detachable multi-layer sleeve according to claim 1, characterized in that, A rotating plate (11) is rotatably provided at the air inlet (3) of the barrel body (1). An adjustment hole (12) is correspondingly provided on the rotating plate (11). The shape of the adjustment hole (12) is adapted to the air inlet (3). The rotating plate (11) changes the overlapping area of ​​the adjustment hole (12) and the air inlet (3) by rotating, thereby adjusting the air intake area of ​​the air inlet (3).

7. A biomass furnace with a detachable multi-layer sleeve according to claim 6, characterized in that, The rotating plate (11) is provided with a lever (13).

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