Biomass stove with flue gas circulation structure

Abstract

The utility model relates to the technical field of biomass stoves, in particular to a biomass stove with a flue gas circulation structure, which comprises a biomass combustion furnace, an extension feeding port and a construction box are fixedly mounted on the side wall of the biomass combustion furnace, a sealing door is rotatably mounted on the extension feeding port, a box door is mounted on the construction box, and a flue gas circulation structure is mounted on the box door. A stove opening is formed in the upper end of the biomass combustion furnace, and furnace frames are evenly distributed around the stove opening. The gas return plate is arranged at the bottom of the stove opening, gas which does not participate in complete combustion is conducted to the upper annular pipe, the gas which does not participate in complete combustion can be sucked in through the gas suction opening by starting the fan, and the gas which does not participate in complete combustion is sprayed to a biomass combustion pile on the steel frame through the gas spraying opening formed in the lower side, so that the biomass combustion pile is combusted again to release heat, and the combustion efficiency is improved. The thermal conversion efficiency of the biomass combustion furnace is improved, meanwhile, gas poisoning caused by overflow of carbon monoxide is avoided, and the use safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of biomass stoves, in particular to a biomass stove with a smoke circulation structure. Background Art

[0002] Biomass stoves are energy-saving and environmentally friendly stoves that use biomass fuel. They are particularly popular in rural areas of China. The promotion of biomass stoves helps solve the problem of straw burning in rural areas, and also responds to the government's requirements for environmental protection and clean energy. With the rise in fossil energy prices and the increase in environmental pressure, biomass stoves and fuels have become a popular choice.

[0003] The working principle of the biomass stove is to use biomass fuel to burn and gasify under the condition of controlling oxygen supply to generate heat energy and combustible gas. The combustible gas burns at the stove mouth to provide heat. The combustible gas generated is mainly hydrogen and carbon monoxide. The thermal conversion efficiency of existing biomass stoves is relatively low. The main reason is that the generated combustible gas is not fully utilized and there is a situation of incomplete combustion, which leads to low thermal conversion efficiency of the entire biomass stove. For this reason, we propose a biomass stove with a flue gas circulation structure to improve the thermal conversion efficiency of the biomass stove. Utility Model Content

[0004] The utility model aims to solve the shortcomings of the prior art and proposes a biomass stove with a smoke circulation structure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A biomass stove with a flue gas circulation structure comprises a biomass combustion stove, an extension feeding port and a construction box are fixedly installed on the side wall of the biomass combustion stove, a sealing door is rotatably installed on the extension feeding port, a box door is installed on the construction box, a lower air pipe and an upper air pipe are respectively arranged on the upper and lower sides of the construction box, a stove opening is opened at the upper end of the biomass combustion stove, a stove rack is evenly installed around the stove opening, a support block is fixedly installed on the inner wall of the biomass combustion stove, and a steel The upper end of the upper air pipe extends to the inner side of the biomass combustion furnace and is connected to an upper ring pipe, and air intake ports are evenly arranged on the upper ring pipe. The lower end of the lower air pipe extends to the inner side of the biomass combustion furnace and is connected to a lower ring pipe, and air injection ports are evenly arranged on the lower ring pipe. A connecting piece is arranged at the bottom of the upper ring pipe, a connecting rod is arranged on the upper side of the lower ring pipe, and an air return plate is installed on the lower side of the stove mouth. A middle cavity is connected and installed in the middle of the lower air pipe and the upper air pipe, and a fan is installed inside the middle cavity.

[0007] Preferably, the outer extension feeding port is a rectangular feeding port, and a handle is provided on the sealing door.

[0008] Preferably, four connecting rods are evenly distributed along the upper side of the lower ring tube, and the upper ends of the connecting rods are fixedly mounted on the inner wall of the biomass combustion furnace.

[0009] Preferably, a plurality of groups of the connecting members are arranged along the bottom of the upper ring tube, and the connecting members are fixedly mounted on the inner wall of the biomass combustion furnace.

[0010] Preferably, a heat insulating layer is embedded inside the biomass combustion furnace, and the heat insulating layer is made of asbestos heat insulating material.

[0011] Preferably, the air intake port is a flared air intake port and is arranged obliquely upward along the upper ring tube.

[0012] Preferably, the air jet is arranged obliquely downward along the lower ring tube.

[0013] Preferably, the air return plate is arranged in a circle along the bottom of the stove opening, and the air return plate is an inwardly concave arc-shaped ring plate.

[0014] In the utility model, a biomass stove with a flue gas circulation structure is described. Due to the high temperature at the stove mouth and the thermal turbulence effect, a part of the combustible gas rushes into the biomass combustion furnace under the influence of high temperature, resulting in incomplete combustion. The utility model transmits the gas that does not participate in complete combustion to the upper ring pipe through the return air plate arranged at the bottom of the stove mouth. By starting the fan, the air intake port arranged on the upper ring pipe draws the gas into the upper ring pipe. The gas sucked into the upper ring pipe passes through the upper ring pipe, the upper air pipe, the bearing cavity, the lower air pipe, and the lower ring pipe, and finally sprays the gas toward the steel frame of the biomass combustion furnace through the jet port on the lower ring pipe. Since the biomass fuel is placed on the steel frame for combustion reaction, the incompletely burned gas ejected from the jet port burns again to release heat, thereby improving the thermal conversion efficiency of the biomass combustion furnace, while also avoiding gas poisoning caused by carbon monoxide overflow, thereby improving safety in use.

[0015] The utility model has a reasonable design. An air return plate is arranged at the bottom of the stove mouth to conduct the gas that has not participated in complete combustion to the upper ring pipe. By starting the fan, the air intake port can suck in the incompletely burned gas, and the incompletely burned gas can be sprayed toward the biomass combustion pile on the steel frame through the air injection port arranged on the lower side, so that it can burn again to release heat, thereby improving the thermal conversion efficiency of the biomass combustion stove, and also avoiding gas poisoning caused by carbon monoxide overflow, thereby improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a biomass stove with a smoke circulation structure proposed by the utility model;

[0017] Figure 2A cross-sectional view of a biomass stove with a smoke circulation structure proposed in the utility model Figure 1 ;

[0018] Figure 3 A cross-sectional view of a biomass stove with a smoke circulation structure proposed in the utility model Figure 2 ;

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the lower ring pipe in the utility model.

[0020] In the figure: 1. biomass combustion furnace; 101. insulation layer; 2. extension feeding port; 3. sealing door; 4. structural box; 5. box door; 6. lower air pipe; 7. upper air pipe; 8. stove mouth; 9. furnace frame; 10. support block; 11. steel frame; 12. lower ring pipe; 13. jet nozzle; 14. connecting rod; 15. middle bearing cavity; 16. fan; 17. upper ring pipe; 18. air intake port; 19. connecting piece; 20. air return plate. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely 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, rather than all of the embodiments.

[0022] Reference Figure 1-4 A biomass stove with a flue gas circulation structure comprises a biomass combustion stove 1, an external feeding port 2 and a construction box 4 are fixedly installed on the side wall of the biomass combustion stove 1, a sealing door 3 is rotatably installed on the external feeding port 2, a box door 5 is installed on the construction box 4, a lower air pipe 6 and an upper air pipe 7 are respectively arranged on the upper and lower sides of the construction box, a stove opening 8 is opened at the upper end of the biomass combustion stove 1, and a stove frame 9 is evenly installed around the stove opening 8, a support block 10 is fixedly installed on the inner wall of the biomass combustion stove 1, a steel frame 11 is arranged on the support block 10, an upper end of the upper air pipe 7 extends to the inner side of the biomass combustion stove 1 and is connected to an upper ring pipe 17, and an air inlet 1 is evenly arranged on the upper ring pipe 17 8. The lower end of the lower air pipe 6 extends to the inner side of the biomass combustion furnace 1 and is connected to and installed with a lower ring pipe 12. The lower ring pipe 12 is evenly provided with air jets 13. A connecting piece 19 is provided at the bottom of the upper ring pipe 17. A connecting rod 14 is provided on the upper side of the lower ring pipe 12. An air return plate 20 is installed on the lower side of the stove mouth 8. The middle part of the lower air pipe 6 and the upper air pipe 7 is connected and installed with a middle cavity 15. A fan 16 is installed inside the middle cavity 15. Four connecting rods 14 are evenly provided along the upper side of the lower ring pipe 12 and the upper end of the connecting rod 14 is fixedly installed on the inner wall of the biomass combustion furnace 1. Several groups of connecting pieces 19 are provided along the bottom of the upper ring pipe 17, and the connecting piece 19 is fixedly installed on the inner wall of the biomass combustion furnace 1.

[0023] In this embodiment, the external feeding port 2 is a rectangular feeding port, and a handle is provided on the sealing door 3.

[0024] Through the above structure, the handle provided on the sealed door 3 facilitates opening of the sealed door 3 and can also avoid the risk of high temperature burns during use.

[0025] In this embodiment, a heat insulating layer 101 is embedded inside the biomass combustion furnace 1, and the heat insulating layer 101 is made of asbestos heat insulating material.

[0026] Through the above structure, the provision of the heat insulation layer 101 prevents the combustion heat inside the biomass combustion furnace 1 from dissipating, reducing heat loss, and at the same time allows the furnace wall of the biomass combustion furnace 1 to remain accessible when working.

[0027] In this embodiment, the air inlet 18 is a flared air inlet and is disposed obliquely upward along the upper annular tube 17 , and the air jet 13 is disposed obliquely downward along the lower annular tube 12 .

[0028] Through the above structure, the air intake port 18 is designed to be obliquely upward along the upper ring pipe 17, so that the air intake port 18 can promptly suck back the gas returned by the air plate 20, and the jet port 13 is set obliquely downward along the lower ring pipe 12, so that the gas ejected from the jet port 13 can directly act on the biomass combustion pile on the upper side of the steel frame 11, thereby facilitating the full combustion of the incompletely burned gas.

[0029] In this embodiment, the air return plate 20 is arranged along the bottom of the stove opening 8 in a circle, and the air return plate 20 is an inwardly concave arc-shaped ring plate.

[0030] Through the above structure, the concave arc shape of the air return plate 20 allows the gas outside the air return plate 20 to be rolled back and guided to the air intake port 18.

[0031] In the utility model, when in use, biomass fuel is added to the steel frame 11 inside the biomass combustion furnace 1 through the extended feeding port 2. After the addition is completed, the sealing door 3 is closed, and the fuel is subsequently ignited, heated and burned. During the combustion process, the fan 16 is started. Under the action of the fan 16, according to the connected air pressure transmission effect, suction is generated at the air intake port 18 on the upper ring pipe 17 to suck the gas into the upper ring pipe 17. The gas sucked into the upper ring pipe 17 passes through the upper ring pipe 17, the upper air pipe 7, the middle bearing cavity 15, the lower air pipe 6, and the lower ring pipe 12, and finally the gas is ejected toward the steel frame 11 of the biomass combustion furnace through the jet port 13 on the lower ring pipe 12. Since the biomass fuel is placed on the steel frame 11 for combustion reaction, the incompletely burned gas ejected through the jet port 13 burns again to release heat, thereby improving the thermal conversion efficiency of the biomass combustion furnace 1.

[0032] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0033] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A biomass stove with a flue gas circulation structure, characterized in that: The invention comprises a biomass combustion furnace (1), wherein an external feeding port (2) and a structural box (4) are fixedly mounted on the side wall of the biomass combustion furnace (1), a sealing door (3) is rotatably mounted on the external feeding port (2), a box door (5) is mounted on the structural box (4), a lower air pipe (6) and an upper air pipe (7) are respectively arranged on the upper and lower sides of the structural box, a stove opening (8) is opened at the upper end of the biomass combustion furnace (1), stove racks (9) are evenly mounted around the stove opening (8), a support block (10) is fixedly mounted on the inner side wall of the biomass combustion furnace (1), a steel frame (11) is arranged on the support block (10), and the upper end of the upper air pipe (7) extends to the biomass combustion furnace (1) and the upper end of the upper air pipe (7) extends to the upper end of ... An upper ring pipe (17) is installed inside the combustion furnace (1) and is connected thereto. Air intake ports (18) are evenly arranged on the upper ring pipe (17). The lower end of the lower air pipe (6) extends to the inside of the biomass combustion furnace (1) and is connected thereto. A lower ring pipe (12) is evenly arranged thereon. Air injection ports (13) are evenly arranged on the lower ring pipe (12). A connecting piece (19) is provided at the bottom of the upper ring pipe (17). A connecting rod (14) is provided on the upper side of the lower ring pipe (12). An air return plate (20) is installed at the lower side of the stove mouth (8). A middle bearing chamber (15) is installed in the middle of the lower air pipe (6) and the upper air pipe (7). A fan (16) is installed inside the middle bearing chamber (15).

2. The biomass stove with a smoke circulation structure according to claim 1, characterized in that: The external feed port (2) is a rectangular feed port, and the sealing door (3) is provided with a handle.

3. The biomass stove with a smoke circulation structure according to claim 1, characterized in that: Four connecting rods (14) are evenly distributed along the upper side of the lower ring tube (12), and the upper ends of the connecting rods (14) are fixedly mounted on the inner wall of the biomass combustion furnace (1).

4. The biomass stove with a smoke circulation structure according to claim 1, characterized in that: A plurality of groups of the connecting pieces (19) are arranged along the bottom of the upper ring tube (17), and the connecting pieces (19) are fixedly mounted on the inner wall of the biomass combustion furnace (1).

5. The biomass stove with a smoke circulation structure according to claim 1, characterized in that: A heat insulation layer (101) is embedded inside the biomass combustion furnace (1), and the heat insulation layer (101) is made of asbestos heat insulation material.

6. The biomass stove with a smoke circulation structure according to claim 1, characterized in that: The air intake port (18) is a flared air intake port and is arranged obliquely upward along the upper ring tube (17).

7. The biomass stove with a smoke circulation structure according to claim 1, characterized in that: The air jet (13) is arranged along the lower ring tube (12) in an oblique downward direction.

8. The biomass stove with a smoke circulation structure according to claim 1, characterized in that: The air return plate (20) is arranged in a circle along the bottom of the stove opening (8), and the air return plate (20) is an inwardly concave arc-shaped ring plate.

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