Double-layer biomass combustion furnace

Abstract

The utility model relates to the technical field of combustion furnaces, in particular to a double-layer biomass combustion furnace which comprises a combustion furnace body, a hearth chamber and a settling chamber are arranged on the lower portion of the combustion furnace body, a combustion hearth is arranged in the hearth chamber, and the upper portion of the combustion hearth is communicated with a hot air pipeline communicated with the settling chamber. A front arch plate and a rear arch plate are arranged in the settling chamber in a staggered manner; a heat exchanger chamber and a heat exchange cavity are arranged at the upper part of the combustion hearth, a heat exchanger is fixedly arranged in the heat exchanger chamber, and the heat exchange cavity is communicated with the settling chamber through the heat exchanger; an air catching hole is formed in the position, corresponding to the heat exchanger, of one side of the combustion furnace body, and a hot air outlet pipe communicates with the position, corresponding to the heat exchanger, of the other side of the combustion furnace body. According to the biomass combustion furnace, a double-layer design structure is adopted, the space site is efficiently utilized, and therefore the biomass combustion furnace can still be used under the condition that the site is limited; and heat generated by biomass combustion can be fully utilized, and the utilization rate of the heat is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion furnaces, in particular to a double-layer biomass combustion furnace. Background Art

[0002] The working principle of a drying tower is to utilize thermal circulation and wind pressure to dry the grain. The hot air and wind pressure in the drying tower promote the flow of moisture in the grain, and the wet air is expelled through the fan, thereby drying the grain. The heat source of the drying tower is generally coal or natural gas. However, coal-fired furnaces are not only expensive to operate but also cause a certain degree of air pollution. Therefore, to save costs and reduce air pollution, biomass furnaces are often used as the heat source of the drying tower.

[0003] Biomass furnaces use biomass briquette fuels, such as chopped wood, firewood, straw, corn cobs, various fruit shells, and various biomass briquettes. Air is supplied by a fan, enabling controllable furnace temperature and air volume, ensuring the fuel is fully gasified and burned within the furnace. However, existing biomass furnaces are large in size, requiring a large footprint, making them difficult to use in limited locations. Furthermore, the heat utilization rate of the biomass during combustion is low. Summary of the Invention

[0004] In order to solve the problems that existing biomass combustion stoves cannot be used under limited space conditions and have low heat utilization rate, the utility model provides a double-layer biomass combustion stove. The double-layer design structure adopts an efficient use of space, so that the biomass combustion stove can still be used under limited space conditions; and the heat generated by biomass combustion can be fully utilized, thereby improving the heat utilization rate.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a double-layer biomass combustion furnace, comprising a combustion furnace body, a furnace chamber and a settling chamber provided at the lower portion of the combustion furnace body, a combustion furnace provided inside the furnace chamber, a hot air duct connected to the settling chamber at the upper portion of the combustion furnace; a front arch plate and a rear arch plate provided in a staggered manner inside the settling chamber. The furnace chamber serves to install the combustion furnace, and biomass is burned in the combustion furnace to generate heat. The smoke and heat generated by the biomass combustion can enter the settling chamber through the hot air duct, and the settling chamber serves to settle the smoke. The front arch plate and the rear arch plate reduce the smoke entering the heat exchanger, and at the same time, the biomass suspension entering the settling chamber can be burned secondary.

[0006] The upper portion of the combustion furnace is provided with a heat exchanger chamber and a heat exchange cavity. A heat exchanger is fixedly installed within the heat exchanger chamber, and the heat exchange cavity is connected to the settling chamber via the heat exchanger. A chimney connected to the heat exchange cavity is provided on one side of the combustion furnace body. The heat exchanger exchanges heat with hot air exhausted from the settling chamber, and the chimney allows the heated air to be exhausted from the combustion furnace body.

[0007] A wind-catching hole is formed on one side of the combustion furnace body at a location corresponding to the heat exchanger, and a hot air outlet duct is connected to the other side of the combustion furnace body at a location corresponding to the heat exchanger. External air enters the heat exchanger chamber through the wind-catching hole, exchanges heat with the hot air circulating in the heat exchanger, and then absorbs heat from the hot air before being discharged from the heat exchanger chamber through the hot air outlet duct.

[0008] Furthermore, a support plate and a fixed plate are fixedly installed inside the combustion furnace body. The fixed plate is located above the support plate. An upper partition is fixedly installed between the support plate and the fixed plate. The space between the upper partition, the support plate, and the fixed plate constitutes a furnace chamber. Hot air holes are opened on the upper partition at positions corresponding to the hot air duct, and the hot air duct is fixedly connected to the upper partition. The support plate supports the combustion furnace, and smoke and hot air generated by biomass combustion can enter the settling chamber through the hot air duct and hot air holes.

[0009] Furthermore, the combustion furnace is provided with a feed port, and a through hole is provided on the front side of the combustion furnace body at a position corresponding to the feed port; an air inlet pipe is connected to the lower portion of the combustion furnace, and a furnace door is provided on the rear side of the combustion furnace body at a position corresponding to the combustion furnace. An ignition port and an ash discharge port are provided on the combustion furnace at positions corresponding to the furnace door. Biomass material can be transported into the combustion furnace through the through hole and feed port, air can be transported into the combustion furnace through the air inlet pipe, the biomass transported into the combustion furnace can be ignited through the ignition port, and ash produced by the biomass combustion can be discharged from the combustion furnace through the ash discharge port.

[0010] Furthermore, a heat exchange bottom plate and a heat exchange top plate are fixedly installed inside the combustion furnace body. The heat exchange bottom plate is located between the heat exchange top plate and the fixed plate. The space between the upper partition plate, the heat exchange bottom plate, and the support plate constitutes the settling chamber. The space between the heat exchange bottom plate and the heat exchange top plate constitutes the heat exchange chamber. The front arch plate is tilted downwardly at the bottom of the fixed plate, and the rear arch plate is tilted upwardly at the top of the support plate. The purpose of the tilted installation of the front and rear arch plates is to block smoke and dust from entering the settling chamber, thereby reducing smoke and dust from entering the heat exchanger.

[0011] Furthermore, the heat exchange chamber includes heat exchange chamber 1, heat exchange chamber 2, heat exchange chamber 3, and heat exchange chamber 4. Two strip baffles 1 are fixedly installed between the fixed plate and the heat exchange bottom plate. The space between the two strip baffles 1 constitutes heat exchange chamber 2, and the space between one of the strip baffles 1 and the side plate of the combustion furnace body constitutes heat exchange chamber 4. Strip baffle 2 is fixedly installed between the heat exchange top plate and the top plate of the combustion furnace body. The spaces between the strip baffle 2 and the two side plates of the combustion furnace body respectively constitute heat exchange chamber 1 and heat exchange chamber 3. The hot air generated by biomass combustion passes through the heat exchanger and enters heat exchange chamber 1, heat exchange chamber 2, heat exchange chamber 3, and heat exchange chamber 4 in sequence. The heat exchanger allows for sufficient heat exchange between the outside air and the hot air, thereby fully utilizing the heat generated by biomass combustion.

[0012] Furthermore, the heat exchange chamber 1 is connected to the sedimentation chamber and the heat exchange chamber 2 through a heat exchanger, the heat exchange chamber 2 is connected to the heat exchange chamber 3 through a heat exchanger, and the heat exchange chamber 3 is connected to the heat exchange chamber 4 through a heat exchanger.

[0013] Furthermore, an exhaust hole is provided at the rear side of the combustion furnace body at a position corresponding to the heat exchange chamber 4, and the chimney is fixedly arranged at the exhaust hole. The hot air after heat exchange can enter the chimney through the exhaust hole and be discharged from the combustion furnace body through the chimney.

[0014] Furthermore, a screen is fixedly provided at the wind-catching hole to filter the external air entering the heat exchanger chamber, thereby preventing debris such as plastic bags and leaves from entering the heat exchanger chamber.

[0015] Furthermore, the tops of both side plates of the combustion furnace body are fixedly provided with lifting ears, which facilitate lifting the combustion furnace body so as to lift the combustion furnace body to the installation position.

[0016] Through the above technical solution, the beneficial effects of the utility model are:

[0017] The utility model has a reasonable structure and good use effect. It adopts a double-layer design structure to efficiently utilize space and site, so that the biomass combustion stove can still be used under limited site conditions, solving the problem that the existing biomass combustion stove cannot be used under limited site conditions; at the same time, it can make full use of the heat generated by biomass combustion, thereby improving the utilization rate of heat.

[0018] The utility model transports biomass into the combustion furnace through the feed port and introduces air into the combustion furnace through the air inlet pipe, so that the biomass burns in the combustion furnace body to generate smoke and hot air. The smoke and hot air can enter the settling chamber through the hot air duct and the hot air hole. The front arch plate and the rear arch plate block the smoke and reduce the smoke entering the heat exchanger. At the same time, the biomass suspension that is not fully burned can be burned for the second time, thereby ensuring the full combustion of the biomass and further achieving the effect of fully utilizing the heat generated by the biomass combustion.

[0019] The utility model uses a fan to allow external air to enter the heat exchanger chamber through the wind catching hole, and the screen plays a role in filtering the external air; the hot air generated by biomass combustion passes through the heat exchanger and enters the heat exchange chamber 1, heat exchange chamber 2, heat exchange chamber 3 and heat exchange chamber 4 in sequence. During the process of the hot air circulating in the heat exchanger, it exchanges heat with the external air, and the external air can fully absorb the heat in the hot air. Then, the external air can be discharged from the heat exchanger chamber through the hot air outlet pipe, so that the heat generated by the biomass combustion can be fully utilized and the heat utilization rate is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a double-layer biomass combustion furnace in this utility model. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the structure of a double-layer biomass combustion furnace in this utility model. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of the structure of a double-layer biomass combustion furnace in this utility model. Figure 3 ;

[0023] Figure 4 This is a schematic diagram of the structure of a double-layer biomass combustion furnace in this utility model. Figure 4 .

[0024] The numbers in the accompanying drawings are: 1 is the combustion furnace body, 2 is the lifting ear, 3 is the furnace chamber, 4 is the sedimentation chamber, 5 is the heat exchanger chamber, 6 is the heat exchange chamber one, 7 is the heat exchange chamber two, 8 is the heat exchange chamber three, 9 is the heat exchange chamber four, 10 is the combustion furnace, 11 is the feed port, 12 is the air inlet pipe, 13 is the hot air duct, 14 is the support plate, 15 is the upper partition, 16 is the hot air hole, 17 is the fixed plate, 18 is the front arch plate, 19 is the rear arch plate, 20 is the heat exchange bottom plate, 21 is the heat exchange top plate, 22 is the strip partition one, 23 is the heat exchanger, 24 is the strip partition two, 25 is the exhaust hole, 26 is the chimney, 27 is the screen, 28 is the hot air outlet pipe, and 29 is the through hole. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0026] like Figures 1 to 4 As shown, a double-layer biomass combustion furnace includes a combustion furnace body 1, wherein a furnace chamber 3 and a settling chamber 4 are provided at the lower portion of the combustion furnace body 1, a combustion furnace 10 is provided inside the furnace chamber 3, and a hot air duct 13 connected to the settling chamber 4 is connected to the upper portion of the combustion furnace 10; a front arch plate 18 and a rear arch plate 19 are staggered inside the settling chamber 4. In this embodiment, the combustion furnace 10 is connected to the settling chamber 4 through the hot air duct 13, and the biomass material burns in the combustion furnace 10 to generate hot air and smoke, which enter the settling chamber 4 through the hot air duct 13, and the smoke settles in the settling chamber 4. Moreover, the biomass suspension undergoes secondary combustion due to its high temperature, and the front arch plate 18 and the rear arch plate 19 block the smoke in turn, which can effectively settle the smoke.

[0027] A heat exchanger chamber 5 and a heat exchange cavity are provided at the upper portion of the combustion furnace 10. A heat exchanger 23 is fixedly installed within the heat exchanger chamber 5. The heat exchange cavity is connected to the settling chamber via the heat exchanger 23. A chimney 26 connected to the heat exchange cavity is provided on one side of the combustion furnace body 1. In this embodiment, the heat exchanger chamber 5 and the heat exchange cavity are both located above the furnace chamber 3 and the settling chamber 4. Hot air can enter the heat exchanger 23 and the heat exchange cavity through the settling chamber. The heat exchanger 23 exchanges heat with the hot air, and the hot air after heat exchange is discharged from the combustion furnace body 1 through the chimney 26.

[0028] A wind-catching hole is formed on one side of the combustion furnace body 1 at a position corresponding to the heat exchanger 3, and a hot air outlet pipe 28 is connected to the other side of the combustion furnace body 1 at a position corresponding to the heat exchanger 3. In this embodiment, the hot air outlet pipe 28 is connected to a mixing chamber, which is connected to a drying tower via a pipeline. A fan is installed on the pipeline. When the fan is started, outside air can enter the heat exchanger chamber 5 through the wind-catching hole, exchange heat with the hot air circulating in the heat exchanger 23, absorb heat from the hot air, and then pass through the heat exchanger 23. The outside air is finally discharged through the hot air outlet pipe 28 and transported to the mixing chamber, and finally transported to the drying tower for use by the drying tower.

[0029] A support plate 14 and a fixed plate 17 are fixedly installed inside the combustion furnace body 1. The fixed plate 17 is located above the support plate 14. An upper partition 15 is fixedly installed between the support plate 14 and the fixed plate 17. The upper partition 15 and the space between the support plate 14 and the fixed plate 17 constitute the furnace chamber 3. The upper partition 15 is provided with hot air holes 16 at the position corresponding to the hot air duct 13. The hot air duct 13 is fixedly connected to the upper partition 15. In this embodiment, the combustion furnace 10 is fixedly installed between the support plate 14 and the fixed plate 17. The support plate 14 supports the combustion furnace 10. The smoke and hot air generated by the biomass combustion enter the settling chamber 4 through the hot air duct 13 and the hot air holes 16.

[0030] A feed port 11 is provided on the combustion furnace 10, and a through hole 29 is provided at the position of the feed port 11 on the front side of the combustion furnace body 1; an air inlet pipe 12 is connected to the lower part of the combustion furnace 10, and a furnace door is provided at the position of the combustion furnace 10 on the rear side of the combustion furnace body 1, and an ignition port and an ash discharge port are provided at the position of the furnace door on the combustion furnace 10. In this embodiment, biomass materials can be transported to the combustion furnace 10 through an auger feeding device, and the through hole 29 facilitates the auger feeding device to pass through the combustion furnace body 1 to transport biomass materials into the combustion furnace 10 through the feed port 11; wherein the air inlet pipe 12 passes through the combustion furnace body 1 and is connected to the air outlet end of the external blower, and air can be transported to the combustion furnace 10 through the blower and the air inlet pipe 12 to provide oxygen for biomass combustion; the furnace door is hinged to the combustion furnace body 1 to facilitate opening and closing the furnace door. When the furnace door is opened, the biomass transported to the combustion furnace 10 can be ignited through the ignition port, and the ash produced by the biomass combustion can be discharged from the combustion furnace 10 through the ash discharge port, wherein valves are installed at both the ignition port and the ash discharge port, and the ash discharge port is located directly below the ignition port.

[0031] A heat exchange bottom plate 20 and a heat exchange top plate 21 are fixedly installed inside the combustion furnace body 1. The heat exchange bottom plate 20 is located between the heat exchange top plate 21 and the fixed plate 17. The space between the upper partition plate 15, the heat exchange bottom plate 20, and the support plate 14 constitutes the settling chamber 4, and the space between the heat exchange bottom plate 20 and the heat exchange top plate 21 constitutes the heat exchange chamber 5. The front arch plate 18 is tilted downwardly and arranged at the bottom of the fixed plate 17, and the rear arch plate 19 is tilted upward and arranged at the top of the support plate 14. In this embodiment, there is a gap between the lower end of the front arch plate 18 and the support plate 14, and a gap between the upper end of the rear arch plate 19 and the fixed plate 17. The purpose is to allow hot air to pass through the front arch plate 18 and the rear arch plate 19 in sequence before entering the heat exchanger 23.

[0032] The heat exchange chamber includes heat exchange chamber one 6, heat exchange chamber two 7, heat exchange chamber three 8 and heat exchange chamber four 9. Two strip partition plates one 22 are fixedly arranged between the fixed plate 17 and the heat exchange bottom plate 20. The space between the two strip partition plates one 22 constitutes the heat exchange chamber two 7, and the space between one of the strip partition plates one 22 and the side plate of the combustion furnace body 1 constitutes the heat exchange chamber four 9; a strip partition plate two 24 is fixedly arranged between the heat exchange top plate 21 and the top plate of the combustion furnace body 1, and the space between the strip partition plate two 24 and the two side plates of the combustion furnace body 1 respectively constitutes the heat exchange chamber one 6 and heat exchange chamber three 8.

[0033] The heat exchange chamber 1 6 is connected to the settling chamber 4 and the heat exchange chamber 2 7 through the heat exchanger 23. The heat exchange chamber 2 7 is connected to the heat exchange chamber 3 8 through the heat exchanger 23. The heat exchange chamber 3 8 is connected to the heat exchange chamber 4 9 through the heat exchanger 23. In this embodiment, the heat exchanger 23 includes four heat exchange components, each of which has eight groups of heat exchange tubes, and each group of heat exchange tubes has fourteen tubes. Hot air passes through the heat exchange tubes, and the upper and lower ends of the heat exchange tubes pass through the heat exchange top plate 21 and the heat exchange bottom plate 20 respectively. The hot air enters the heat exchange chamber 1 6, the heat exchange chamber 2 7, the heat exchange chamber 3 8 and the heat exchange chamber 4 9 in sequence through the four heat exchange components. The hot air circulates in the four heat exchange components in sequence, and exchanges heat with the external air during the circulation of the hot air in the four heat exchange components of the heat exchanger 23.

[0034] An exhaust hole 25 is provided on the rear side of the combustion furnace body 1 at a location corresponding to the heat exchange chamber 29 9, and a chimney 26 is fixedly mounted at the exhaust hole 25. In this embodiment, the hot air after heat exchange enters the heat exchange chamber 29 9 and is then discharged from the combustion furnace body 1 through the exhaust hole 25 and chimney 26.

[0035] The wind-catching hole is fixedly provided with a screen 27. In this embodiment, the screen 27 is fixedly connected to the combustion furnace body 1, and the screen 27 can filter plastic bags, leaves and other debris in the external air to prevent the debris from entering the heat exchanger chamber 5.

[0036] The tops of both side plates of the combustion furnace body 1 are fixed with lifting ears 2. In this embodiment, the lifting ears 2 are welded and fixed at the middle position of the top of the side plates of the combustion furnace body 1, and the combustion furnace body 1 is easily lifted by the lifting ears 2.

[0037] The working principle of the present invention is as follows: the biomass material is transported to the combustion furnace 10 through the auger feeding device and the feed port 11, and air is introduced into the combustion furnace 10 through the blower and the air inlet pipe 12. The air can provide oxygen for the combustion of the biomass, and then the furnace door is opened and the biomass transported to the combustion furnace 10 is ignited through the ignition port, and then the furnace door is closed.

[0038] The smoke and hot air generated by the combustion of biomass enter the settling chamber 4 through the hot air duct 13 and the hot air hole 16. The front arch plate 18 first blocks the smoke, and the rear arch plate 19 blocks the smoke. Due to its high temperature, the biomass suspension is burned again in the settling chamber 4 to ensure that the biomass is fully burned. After that, the hot air enters the heat exchange chamber 1 6 through the heat exchanger 23, and then enters the heat exchange chamber 2 7 through the heat exchanger 23, and then enters the heat exchange chamber 3 8 through the heat exchanger 23, and finally enters the heat exchange chamber 1 6 through the heat exchanger 23. In the heat exchange chamber 49, under the action of the fan, the external air enters the heat exchanger chamber 5 through the wind catching hole, the screen 27 filters the debris in the external air, and the external air circulates in the heat exchanger chamber 5 toward the hot air outlet pipe 28 and the hot air circulates in the heat exchanger 23. During this process, the external air exchanges heat with the hot air, and the external air absorbs the heat in the hot air. Then the external air enters the mixing chamber through the hot air outlet pipe 28 and the pipeline, and finally enters the drying tower from the mixing chamber through the pipeline. The hot air that has absorbed heat enters and is discharged through the exhaust hole 25 and the chimney 26.

[0039] When the biomass in the combustion furnace 10 is about to be burned out, the biomass can be transported to the combustion furnace 10 again through the auger feeding device. When there is too much ash in the combustion furnace 10, the furnace door can be opened to discharge the ash in the combustion furnace 10 through the ash discharge port.

[0040] The embodiments described above are only preferred embodiments of the utility model and do not limit the scope of implementation of the utility model. Therefore, any equivalent changes or modifications made according to the technical solutions described in the patent scope of the utility model should be included in the scope of the patent application of the utility model.

Claims

1. A double-layer biomass combustion furnace, comprising a combustion furnace body (1), characterized in that: The lower portion of the combustion furnace body (1) is provided with a furnace chamber (3) and a settling chamber (4); a combustion furnace (10) is provided inside the furnace chamber (3); the upper portion of the combustion furnace (10) is connected to a hot air duct (13) connected to the settling chamber (4); a front arch plate (18) and a rear arch plate (19) are staggeredly provided inside the settling chamber (4); A heat exchanger chamber (5) and a heat exchange cavity are provided at the upper portion of the combustion furnace (10); a heat exchanger (23) is fixedly provided inside the heat exchanger chamber (5); the heat exchange cavity is connected to the settling chamber via the heat exchanger (23); and a chimney (26) connected to the heat exchange cavity is provided on one side of the combustion furnace body (1); A wind-catching hole is provided on one side of the combustion furnace body (1) at a position corresponding to the heat exchanger (23), and a hot air outlet pipe (28) is connected to the other side of the combustion furnace body (1) at a position corresponding to the heat exchanger (23).

2. A double-layer biomass combustion furnace according to claim 1, characterized in that: A support plate (14) and a fixed plate (17) are fixedly provided inside the combustion furnace body (1), the fixed plate (17) is located above the support plate (14), an upper partition (15) is fixedly provided between the support plate (14) and the fixed plate (17), the space between the upper partition (15) and the support plate (14) and the fixed plate (17) constitutes a furnace chamber (3), a hot air hole (16) is opened on the upper partition (15) at a position corresponding to the hot air duct (13), and the hot air duct (13) is fixedly connected to the upper partition (15).

3. The double-layer biomass combustion furnace according to claim 1, characterized in that: A feed port (11) is provided on the combustion furnace (10), and a through hole (29) is provided on the front side of the combustion furnace body (1) at a position corresponding to the feed port (11); an air inlet pipe (12) is connected to the lower part of the combustion furnace (10), and a furnace door is provided on the rear side of the combustion furnace body (1) at a position corresponding to the combustion furnace (10), and an ignition port and an ash discharge port are provided on the combustion furnace (10) at a position corresponding to the furnace door.

4. A double-layer biomass combustion furnace according to claim 2, characterized in that: A heat exchange bottom plate (20) and a heat exchange top plate (21) are fixedly arranged inside the combustion furnace body (1), the heat exchange bottom plate (20) is located between the heat exchange top plate (21) and the fixed plate (17), the space between the upper partition plate (15), the heat exchange bottom plate (20) and the support plate (14) constitutes the sedimentation chamber (4), and the space between the heat exchange bottom plate (20) and the heat exchange top plate (21) constitutes the heat exchanger chamber (5); the front arch plate (18) is arranged at an angle downward at the bottom of the fixed plate (17), and the rear arch plate (19) is arranged at an angle upward at the top of the support plate (14).

5. The double-layer biomass combustion furnace according to claim 4, characterized in that: The heat exchange chamber includes heat exchange chamber one (6), heat exchange chamber two (7), heat exchange chamber three (8) and heat exchange chamber four (9). Two strip partitions one (22) are fixedly arranged between the fixed plate (17) and the heat exchange bottom plate (20). The space between the two strip partitions one (22) constitutes the heat exchange chamber two (7). The space between one of the strip partitions one (22) and the side plate of the combustion furnace body (1) constitutes the heat exchange chamber four (9). A strip partition two (24) is fixedly arranged between the heat exchange top plate (21) and the top plate of the combustion furnace body (1). The space between the strip partition two (24) and the two side plates of the combustion furnace body (1) respectively constitutes the heat exchange chamber one (6) and the heat exchange chamber three (8).

6. The double-layer biomass combustion furnace according to claim 5, characterized in that: The heat exchange chamber 1 (6) is connected to the sedimentation chamber (4) and the heat exchange chamber 2 (7) through the heat exchanger (23), the heat exchange chamber 2 (7) is connected to the heat exchange chamber 3 (8) through the heat exchanger (23), and the heat exchange chamber 3 (8) is connected to the heat exchange chamber 4 (9) through the heat exchanger (23).

7. The double-layer biomass combustion furnace according to claim 6, characterized in that: An exhaust hole (25) is provided at a position corresponding to the fourth heat exchange chamber (9) on the rear side of the combustion furnace body (1), and the chimney (26) is fixedly arranged at the exhaust hole (25).

8. The double-layer biomass combustion furnace according to claim 1, characterized in that: A screen (27) is fixedly provided at the wind-catching hole.

9. The double-layer biomass combustion furnace according to claim 1, characterized in that: Lifting ears (2) are fixedly provided on the tops of both side plates of the combustion furnace body (1).

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