Biomass combustion furnace

Abstract

The utility model relates to a kind of biomass combustion furnace, it includes: main body, heat exchange component and air induction component, main body inside is formed with combustion chamber and flue gas passage, combustion chamber is used for supplying biomass fuel to burn, and with flue gas outlet, flue gas passage is along serpentine and includes several channel sections, each channel section is arranged in parallel interval and sequentially communicates, first channel section is communicated with flue gas outlet, tail channel section has with the outlet of smoke arranged opposite the outlet of smoke.The heat exchange component includes first heat exchange pipe and second heat exchange pipe, first heat exchange pipe is between the outlet of smoke and the outlet of smoke, and is communicated with air inlet, second heat exchange pipe is equipped in each channel section, second heat exchange pipe in each channel section sequentially communicates, second heat exchange pipe in tail channel section is communicated with first heat exchange pipe, second heat exchange pipe in first channel section is communicated with outlet air port.Air induction component is configured to drive airflow to flow from air inlet, and from outlet air port.

Description

Technical Field

[0001] This utility model relates to the field of heat energy exchange technology, and more specifically, to a biomass combustion furnace. Background Technology

[0002] A biomass burner is a device that uses biomass pellets (such as wood chips, straw, and rice husks) as fuel to release heat through combustion. It is mainly used in industrial heating, power generation, and other fields. Biomass burners have advantages such as being environmentally friendly, renewable, and low-cost, making them an ideal alternative to traditional fossil fuel burners.

[0003] A heat exchange boiler is disclosed in the prior art, comprising a combustion chamber and a heat exchange chamber. The heat exchange chamber has a cold air inlet and a hot air outlet arranged side-by-side. The heat exchange chamber contains several heat exchange tubes arranged sequentially in the direction of the cold air inlet and the hot air outlet, and each heat exchange tube is connected to the combustion chamber. Specifically, when the heat exchange boiler is operating, the high-temperature flue gas generated by combustion in the combustion chamber enters the heat exchange tubes. External air enters the heat exchange chamber through the cold air inlet, contacts the outer wall of the heat exchange tubes, and exchanges heat with the high-temperature flue gas inside the heat exchange tubes, finally exiting from the hot air outlet.

[0004] However, the flue gas flow path of this heat exchange boiler is short, and the heat energy is discharged before it is fully released, which limits the heat exchange efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a biomass combustion furnace, which solves the technical problem of how to improve heat exchange efficiency.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0007] This utility model provides a biomass combustion furnace, comprising: a main body having an air inlet, an air outlet, and a flue gas outlet; a combustion chamber and a flue gas passage formed inside the main body; the combustion chamber for burning biomass fuel and having a flue gas outlet; the flue gas passage being arranged in a meandering manner and including several passage segments; the passage segments being arranged side-by-side at intervals and connected sequentially; the first passage segment having a flue gas inlet connected to the flue gas outlet; and the last passage segment having a flue gas outlet opposite to the flue gas outlet; and a heat exchange unit. The component includes a first heat exchange tube and a second heat exchange tube. The first heat exchange tube is located between the flue gas outlet and the exhaust gas outlet and is connected to the air inlet. Each of the channel sections is provided with a second heat exchange tube, and the second heat exchange tubes in each channel section are connected sequentially. The second heat exchange tube in the last channel section is connected to the first heat exchange tube, and the second heat exchange tube in the first channel section is connected to the exhaust gas outlet. The heat exchange component is not connected to the flue gas channel. An air induced draft component is configured to drive airflow from the air inlet into the air outlet and out of the air outlet.

[0008] In some embodiments of this application, the combustion chamber, flue gas passage, and induced draft assembly are arranged side by side in the arrangement direction of each passage segment, with the combustion chamber close to the first passage segment and the induced draft assembly close to the last passage segment, and respectively connected to the second heat exchange tube and the first heat exchange tube in the last passage segment.

[0009] In some embodiments of this application, each of the channel segments is arranged side by side in the horizontal direction and extends vertically; the flue gas channel further includes a connecting segment extending in the horizontal direction, and the connecting segment is used to connect two adjacent channel segments; a preheating cavity is also formed inside the main body, the preheating cavity is located above the flue gas channel and is arranged vertically opposite to the connecting segment, and the preheating cavity is connected to the flue gas outlet and the exhaust outlet respectively, and the first heat exchange tube is provided in the preheating cavity.

[0010] In some embodiments of this application, the horizontal direction includes a first horizontal direction and a second horizontal direction that are perpendicular to each other; each of the channel segments is arranged side by side in the first horizontal direction; the first heat exchange tube and the second heat exchange tube both extend along the first horizontal direction and are each provided with several groups in the vertical direction, each group of first heat exchange tubes includes several first heat exchange tubes arranged side by side and spaced apart in the second horizontal direction, and each group of second heat exchange tubes includes several second heat exchange tubes arranged side by side and spaced apart in the second horizontal direction.

[0011] In some embodiments of this application, adjacent groups of the second heat exchange tubes are arranged in an alternating pattern.

[0012] In some embodiments of this application, the second heat exchange tubes in each of the channel segments are arranged opposite to each other, and a mixing cavity is formed between two adjacent channel segments in the first horizontal direction. The mixing cavity is used to connect the second heat exchange tubes in two adjacent channel segments.

[0013] In some embodiments of this application, an exhaust chamber is also formed inside the main body. The exhaust chamber is arranged around the combustion chamber and is used to connect the second heat exchange tube in the first channel segment and the exhaust port.

[0014] In some embodiments of this application, both the air inlet and the air outlet are located on the side of the combustion chamber away from the flue gas passage in the horizontal direction, and the air inlet is located above the air outlet.

[0015] In some embodiments of this application, the main body includes a shell, a combustion chamber, and a heat exchange chamber; the shell has an air inlet and an air outlet; the combustion chamber is located inside the shell, and an air outlet cavity is formed between the outer wall of the combustion chamber and the interior of the shell; the combustion chamber has a flue gas outlet and a combustion chamber is formed inside; the heat exchange chamber has a flue gas outlet, and the flue gas outlet is exposed outside the shell; a flue gas passage is formed inside the heat exchange chamber; and the first heat exchange tube is located inside the heat exchange chamber.

[0016] In some embodiments of this application, the number of channel segments is two; the housing is provided with three ash removal ports, which are arranged at intervals in the horizontal direction, one of which is arranged opposite to the combustion chamber and communicates with the combustion chamber, and the other two are connected to the connecting section and are respectively located below the two channel segments; the heat exchange chamber is provided with two doors for closing or opening the two channel segments, and the housing is provided with windows arranged opposite to the two doors, and the housing is also provided with ash removal doors for closing or opening the windows.

[0017] As can be seen from the above technical solution, the embodiments of this utility model have at least the following advantages and positive effects: In the biomass combustion furnace of this embodiment, after the biomass fuel is burned in the combustion chamber, it produces flue gas carrying heat energy. The flue gas enters a meandering flue gas channel through the flue gas outlet and the flue gas inlet, passing through multiple parallel and spaced channel sections in sequence. From the first channel section to the last channel section, the heat energy carried by the flue gas decreases continuously as it flows through each channel section. The flue gas flows out from the flue gas outlet of the last channel section, contacts the first heat exchange tube, and then flows out from the exhaust port. Driven by the induced draft assembly, the airflow enters the first heat exchange tube through the air inlet, where it exchanges heat with the cooler flue gas flowing out from the last channel section to achieve a preheating effect. It then enters the second heat exchange tube in the last channel section and flows through the second heat exchange tubes in each channel section in sequence, finally being discharged from the exhaust port through the second heat exchange tube in the first channel section. Because the flue gas passage is meandering, it can force the residence time of the flue gas in the flue gas passage to be extended, so that the heat energy carried by the flue gas can be released more fully. In addition, as the airflow flows in from the inlet and out from the outlet, it can continuously exchange heat with the flue gas whose temperature is gradually rising, so as to achieve gradient heating, making full use of heat energy and thus improving heat exchange efficiency. Attached Figure Description

[0018] The various objectives, features, and advantages of this invention will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of the invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein: Figure 1 This is a schematic diagram of a biomass combustion furnace according to an exemplary embodiment.

[0019] Figure 2 yes Figure 1 A sectional view.

[0020] Figure 3 It is the airflow and smoke in Figure 2 A schematic diagram of the flow path.

[0021] Figure 4 yes Figure 1 A schematic diagram of the structure with the shell removed.

[0022] Figure 5 yes Figure 1 A schematic diagram of the middle shell structure.

[0023] The annotations in the attached figures are explained as follows: 1. Main body; 11. Shell; 111. Air inlet; 112. Air outlet; 113. Air outlet chamber; 114. Ash removal port; 115. Window; 116. Ash removal door; 12. Combustion chamber; 121. Combustion chamber; 122. Flue gas outlet; 13. Heat exchange chamber; 131. Flue gas passage; 1311. Passage section; 1312. Connecting section; 132. Smoke inlet; 133. Smoke outlet; 134. Preheating chamber; 135. Mixing chamber; 136. Smoke exhaust port; 137. Door body; 2. Heat exchange assembly; 21. First heat exchange tube; 22. Second heat exchange tube; 3. Exhaust fan assembly; 31. Air duct; 32. Exhaust fan; D1, first horizontal direction; D2, second horizontal direction. Detailed Implementation

[0024] Although the present invention can be readily embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0025] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0026] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of this invention are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0027] Please see Figures 1 to 3The biomass combustion furnace provided in one embodiment of this utility model mainly includes a main body 1, a heat exchange component 2, and an induced draft component 3. The main body 1 has an air inlet 111, an air outlet 112, and a flue gas outlet 136. The main body 1 has a combustion chamber 121 and a flue gas passage 131 inside. The combustion chamber 121 is used for burning biomass fuel and has a flue gas outlet 122. The flue gas passage 131 is arranged in a meandering manner and includes several passage segments 1311. Each passage segment 1311 is arranged side by side at intervals and connected in sequence. The first passage segment 1311 has a flue gas inlet 132, and the flue gas inlet 132 is connected to the flue gas outlet 122. The last passage segment 1311 has a flue gas outlet 133, and the flue gas outlet 133 is arranged opposite to the flue gas outlet 136. The heat exchange assembly 2 includes a first heat exchange tube 21 and a second heat exchange tube 22. The first heat exchange tube 21 is located between the flue gas outlet 133 and the exhaust gas outlet 136 and is connected to the air inlet 111. Each channel segment 1311 is equipped with a second heat exchange tube 22, and the second heat exchange tubes 22 in each channel segment 1311 are connected sequentially. The second heat exchange tube 22 in the last channel segment 1311 is connected to the first heat exchange tube 21, and the second heat exchange tube 22 in the first channel segment 1311 is connected to the air outlet 112. The heat exchange assembly 2 and the flue gas channel 131 are not connected to each other. The induced draft assembly 3 is configured to drive the airflow into the air inlet 111 and out of the air outlet 112.

[0028] In the biomass combustion furnace of this utility model embodiment, after the biomass fuel is burned in the combustion chamber 121, it generates flue gas carrying heat energy. The flue gas enters the meandering flue gas channel 131 through the flue gas outlet 122 and the flue gas inlet 132, and passes through multiple parallel and spaced channel sections 1311 in sequence. From the first channel section 1311 to the last channel section 1311, the heat energy carried by the flue gas as it flows through each channel section 1311 continuously decreases. The flue gas flows out from the flue gas outlet 133 of the last channel section 1311, contacts the first heat exchange tube 21, and then flows out from the flue gas outlet 136. Driven by the induced draft assembly 3, the airflow enters the first heat exchange tube 21 through the inlet 111. It exchanges heat with the cooler flue gas exiting the last channel section 1311 through the first heat exchange tube 21, achieving a preheating effect. Then, it enters the second heat exchange tube 22 within the last channel section 1311 and flows sequentially through the second heat exchange tubes 22 in each channel section 1311, finally exiting through the outlet 112 through the second heat exchange tube 22 in the first channel section 1311. Because the flue gas channel 131 is meandering, it can forcibly prolong the residence time of the flue gas within the channel 131, allowing the heat energy carried by the flue gas to be released more fully. Furthermore, as the airflow flows in from the inlet 111 and out from the outlet 112, it continuously exchanges heat with the gradually increasing temperature of the flue gas to achieve gradient heating, ensuring full utilization of the heat energy and thus improving heat exchange efficiency.

[0029] In a specific embodiment, the combustion chamber 121, the flue gas passage 131, and the induced draft assembly 3 are arranged side by side in the arrangement direction of each passage segment 1311, with the combustion chamber 121 close to the first passage segment 1311 and the induced draft assembly 3 close to the last passage segment 1311. They are connected to the second heat exchange tube 22 and the first heat exchange tube 21 in the last passage segment 1311, respectively, making the overall structure more compact and reasonable, thereby optimizing the space utilization. Furthermore, the induced draft assembly 3 is used to draw in external air through the first heat exchange tube 21 and drive the airflow into the second heat exchange tube 22 in the last passage segment 1311, which is conducive to the smooth flow of airflow and further improves the heat exchange efficiency.

[0030] In a specific embodiment, each channel segment 1311 is arranged side by side in the horizontal direction and extends vertically.

[0031] The flue gas passage 131 also includes a connecting section 1312 extending horizontally, which connects two adjacent passage sections 1311. A preheating chamber 134 is also formed inside the main body 1. The preheating chamber 134 is located above the flue gas passage 131 and is arranged vertically opposite to the connecting section 1312. The preheating chamber 134 is connected to both the flue gas outlet 133 and the exhaust outlet 136, and a first heat exchange tube 21 is installed inside the preheating chamber 134. This layout further optimizes space utilization, and the reasonable and compact structural layout ensures a clear flow path for airflow and flue gas within the main body 1, reducing flow resistance.

[0032] Please see Figures 1 to 4 In a specific embodiment, the horizontal direction includes a first horizontal direction D1 and a second horizontal direction D2 that are perpendicular to each other. Each channel segment 1311 is arranged side-by-side in the first horizontal direction D1. Both the first heat exchange tube 21 and the second heat exchange tube 22 extend along the first horizontal direction D1 and are arranged in several groups in the vertical direction. Each group of first heat exchange tubes 21 includes several first heat exchange tubes 21 arranged side-by-side at intervals in the second horizontal direction D2, and each group of second heat exchange tubes 22 includes several second heat exchange tubes 22 arranged side-by-side at intervals in the second horizontal direction D2.

[0033] The arrangement of the first heat exchange tube 21 and the second heat exchange tube 22 makes their spatial distribution more reasonable, which can effectively increase the contact area between the heat exchange tube and the flue gas, and enable the airflow and flue gas to fully exchange heat in different directions, thereby improving the efficiency and uniformity of heat exchange.

[0034] It should be noted that the first heat exchange tube 21 passes through both sides of the preheating chamber 134 in the first horizontal direction D1, so as to be connected to the air inlet 111 and the air duct assembly 3 respectively, and the second heat exchange tube 22 passes through both sides of the channel section 1311 in the first horizontal direction D1.

[0035] Please see Figure 4 In a specific embodiment, adjacent sets of second heat exchange tubes 22 are arranged in a staggered pattern. This staggered arrangement allows for more thorough heat exchange between the flue gas and the airflow, further improving the efficiency and uniformity of heat exchange.

[0036] It is conceivable that the two adjacent sets of first heat exchange tubes 21 can be arranged in a staggered manner or in a symmetrical manner.

[0037] Please see Figure 2 and Figure 3 In a specific embodiment, the second heat exchange tubes 22 within each channel segment 1311 are arranged opposite to each other, and a mixing chamber 135 is formed between adjacent channel segments 1311 in the first horizontal direction D1. The mixing chamber 135 is used to connect the second heat exchange tubes 22 within adjacent channel segments 1311. After the airflow in all the second heat exchange tubes 22 within one channel segment 1311 is initially mixed in the mixing chamber 135, it is redistributed and flows into the second heat exchange tubes 22 within another channel segment 1311, thereby improving the consistency and uniformity of heat exchange.

[0038] In a specific embodiment, an exhaust chamber 113 is also formed inside the main body 1. The exhaust chamber 113 is arranged around the combustion chamber 121 and is used to connect the second heat exchange tube 22 in the first channel section 1311 and the exhaust port 112. The multiple second heat exchange tubes 22 in the first channel section 1311 are all connected to the exhaust chamber 113, which converges the dispersed heated airflow and ensures that the airflow flows smoothly into the exhaust port 112. Since the exhaust chamber 113 is arranged around the combustion chamber 121, it can use the waste heat of the combustion chamber 121 to keep or heat up the airflow in the exhaust chamber 113, thereby further improving the heat exchange efficiency and the consistency and uniformity of heat exchange.

[0039] Please see Figures 1 to 5 In a specific embodiment, both the air inlet 111 and the air outlet 112 are located on the side of the combustion chamber 121 that is away from the flue gas passage 131 in the horizontal direction, and the air inlet 111 is located above the air outlet 112. Through the specific arrangement of the air inlet 111, the air outlet 112, the second heat exchange tube 22 and the air outlet chamber 113, the gas flow path can be simplified and the airflow efficiency can be enhanced.

[0040] Please see Figures 2 to 5In a specific embodiment, the main body 1 includes a shell 11, a combustion chamber 12, and a heat exchange chamber 13. The shell 11 has an air inlet 111 and an air outlet 112. The combustion chamber 12 is located inside the shell 11, and an air outlet cavity 113 is formed between the outer wall of the combustion chamber 12 and the interior of the shell 11. The combustion chamber 12 has a flue gas outlet 122 and a combustion chamber 121 is formed inside. The heat exchange chamber 13 has a flue gas outlet 136, which is exposed outside the shell 11. A flue gas passage 131 is formed inside the heat exchange chamber 13, and a first heat exchange tube 21 is located inside the heat exchange chamber 13. By dividing the main body 1 into specific components such as the shell 11, the combustion chamber 12, and the heat exchange chamber 13, and assigning each component a specific function, a stable, reliable, and reasonable specific structure is provided for the biomass combustion furnace. The modular design also facilitates manufacturing, installation, and maintenance.

[0041] In this embodiment, a clearance opening is provided at the top of the housing 11, and a smoke exhaust pipe is provided at the top of the heat exchange chamber 13. The smoke exhaust pipe extends outward through the clearance opening, and the top end of the smoke exhaust pipe forms a smoke exhaust port 136.

[0042] Please see Figures 1 to 5 In a specific embodiment, there are two channel sections 1311. The housing 11 has three cleaning ports 114, which are arranged horizontally at intervals. One cleaning port 114 is opposite to the combustion chamber 12 and communicates with the combustion chamber 121. The other two cleaning ports 114 are connected to the connecting section 1312 and are located below the two channel sections 1311 respectively. The heat exchange chamber 13 has two doors 137 for closing or opening the two channel sections 1311 respectively. The housing 11 has windows 115 opposite to the two doors 137, and the housing 11 also has cleaning doors 116 for closing or opening the windows 115.

[0043] By providing multiple cleaning ports 114 and openable doors 137 and ash cleaning doors 116, it is convenient to clean different parts inside the combustion furnace, reducing the impact of dust accumulation on heat exchange efficiency. Maintaining the cleanliness of the combustion furnace interior ensures smooth airflow and normal heat exchange, thereby improving the service life and performance of the combustion furnace.

[0044] In other embodiments, the number of channel segments 1311 is two or more, and the dust removal port 114 and door body 137 are arranged according to the number of open and closed segments, which will not be described in detail here.

[0045] Please see Figures 1 to 4In the above embodiments, the air intake assembly 3 includes an air duct 31 and an air blower 32. The air duct 31 is connected to the end of the first heat exchange tube 21 near the air intake assembly 3 in the first horizontal direction D1 and the air blower 32. The air outlet of the air blower 32 is arranged opposite to the second heat exchange tube 22 on the last channel segment 1311 and is connected to the end of the second heat exchange tube 22 near the air blower 32.

[0046] In this embodiment, the power of the induced draft fan 32 is 11KW.

[0047] It should be noted that in the channel section 1311 near the combustion chamber 121, the upper second heat exchange tube 22 is in contact with the flue gas first, and it is a stainless steel 310 tube. The lower second heat exchange tube 22 is made of stainless steel 304 tube, thereby reducing manufacturing costs while ensuring high temperature resistance.

[0048] In the above embodiments, the first heat exchange tube 21 can be integrally formed with the structure surrounding the preheating cavity 134, or it can be connected separately. The second heat exchange tube 22 can be integrally formed with the structure surrounding the channel section 1311, or it can be connected separately.

[0049] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A biomass combustion furnace, characterized by, include: The main body has an air inlet, an air outlet, and a flue gas outlet. Inside the main body, there is a combustion chamber and a flue gas passage. The combustion chamber is used for burning biomass fuel and has a flue gas outlet. The flue gas passage is arranged in a meandering manner and includes several passage segments. The passage segments are arranged side by side at intervals and connected sequentially. The first passage segment has a flue gas inlet and is connected to the flue gas outlet. The last passage segment has a flue gas outlet and is arranged opposite to the flue gas outlet. The heat exchange assembly includes a first heat exchange tube and a second heat exchange tube. The first heat exchange tube is located between the flue gas outlet and the exhaust gas outlet and is connected to the air inlet. Each of the channel sections is provided with a second heat exchange tube. The second heat exchange tubes in each channel section are connected sequentially. The second heat exchange tube in the last channel section is connected to the first heat exchange tube. The second heat exchange tube in the first channel section is connected to the exhaust gas outlet. The heat exchange assembly and the flue gas channel are not connected to each other. An air intake assembly is configured to drive airflow into the air inlet and out of the air outlet.

2. The biomass combustion furnace according to claim 1, characterized by The combustion chamber, flue gas passage, and induced draft assembly are arranged side by side in the arrangement direction of each passage segment, with the combustion chamber close to the first passage segment and the induced draft assembly close to the last passage segment, and respectively connected to the second heat exchange tube and the first heat exchange tube in the last passage segment.

3. The biomass combustion furnace according to claim 2, characterized by Each of the aforementioned channel segments is arranged side by side in the horizontal direction and extends vertically; The flue gas passage further includes a connecting section extending along the horizontal direction, and the connecting section is used to connect two adjacent passage sections; The main body also has a preheating cavity, which is located above the flue gas passage and is arranged vertically opposite to the connecting section. The preheating cavity is connected to the flue gas outlet and the exhaust outlet, and the first heat exchange tube is provided in the preheating cavity.

4. The biomass combustion furnace according to claim 3, characterized by The horizontal direction includes a first horizontal direction and a second horizontal direction that are perpendicular to each other; Each of the aforementioned channel segments is arranged side by side in the first horizontal direction; Both the first heat exchange tube and the second heat exchange tube extend along the first horizontal direction and are arranged in several groups in the vertical direction. Each group of first heat exchange tubes includes several first heat exchange tubes arranged side by side and spaced apart in the second horizontal direction, and each group of second heat exchange tubes includes several second heat exchange tubes arranged side by side and spaced apart in the second horizontal direction.

5. The biomass combustion furnace according to claim 4, characterized by The two adjacent groups of the second heat exchange tubes are arranged in an alternating pattern.

6. The biomass combustion furnace of claim 4, wherein The second heat exchange tubes in each of the channel segments are arranged opposite to each other, and a mixing cavity is formed between two adjacent channel segments in the first horizontal direction. The mixing cavity is used to connect the second heat exchange tubes in the two adjacent channel segments.

7. The biomass combustion furnace according to claim 3, characterized by The main body also has an exhaust chamber, which is arranged around the combustion chamber and is used to connect the second heat exchange tube in the first channel section and the exhaust port.

8. The biomass combustion furnace according to claim 7, characterized by Both the air inlet and the air outlet are located on the side of the combustion chamber away from the flue gas passage in the horizontal direction, and the air inlet is located above the air outlet.

9. The biomass combustion furnace according to claim 7, characterized in that, The main body includes a shell, a combustion chamber, and a heat exchange chamber; The housing is provided with the air inlet and the air outlet; The combustion chamber is located inside the housing, and the exhaust chamber is formed between the outer wall of the combustion chamber and the interior of the housing. The combustion chamber has the flue gas outlet and the combustion chamber is formed inside. The heat exchange chamber is provided with a flue gas outlet, which is exposed outside the shell. The flue gas passage is formed inside the heat exchange chamber, and the first heat exchange tube is located inside the heat exchange chamber.

10. The biomass combustion furnace according to claim 9, characterized by The number of channel segments is two; The housing is provided with three cleaning ports, which are arranged at intervals in the horizontal direction. One cleaning port is arranged opposite to the combustion chamber and communicates with the combustion chamber. The other two cleaning ports are connected to the connecting section and are located below the two channel sections respectively. The heat exchange chamber is provided with two doors for closing or opening the two passage sections respectively. The shell has windows arranged opposite to the two doors, and the shell is also provided with a dust removal door for closing or opening the windows.

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