Biomass heating stove

Abstract

The present application relates to a kind of biomass heating stove, comprising: bunker for storing fuel;Combustion chamber, including upper furnace and lower furnace, lower furnace is equipped with combustion cup and ignition mechanism;Feeding mechanism, for the combustion in bunker is transported to combustion cup;Air inlet mechanism, for air supply to combustion chamber;Multi-stage oxygen aid mechanism, including two-stage oxygen aid pipe and three-stage oxygen aid pipe, two-stage oxygen aid pipe is used to supply oxygen to lower furnace, and three-stage oxygen aid pipe is used to supply oxygen to upper furnace;Smoke exhaust mechanism, for the flue gas generated after combustion in combustion chamber is discharged;The present application can effectively reduce the smoke generation in the combustion process of biomass fuel, more environmentally friendly.

Description

Technical Field

[0001] This invention relates to the field of biomass combustion furnace technology, specifically to a biomass heating furnace. Background Technology

[0002] To prevent farmers from burning crop straw in the fields and polluting the environment, the government is vigorously promoting the processing of crop straw into biomass pellet fuel. Biomass pellets are a renewable fuel; their promotion is beneficial for managing crop straw and reduces the use of non-renewable resources such as coal, making them a promising prospect for widespread adoption. With the promotion of biomass pellet fuel, various biomass combustion furnaces using biomass pellets as fuel have emerged and achieved significant development.

[0003] Currently used biomass combustion furnaces produce a large amount of smoke during combustion, which does not meet current environmental protection testing requirements. The smoke is mainly formed by the combination of solid particles produced by incomplete combustion of biomass fuel and small liquid droplets in the air. Therefore, the problem of excessive smoke emissions during biomass combustion can be addressed by focusing on how to ensure complete combustion of biomass fuel.

[0004] A search revealed that Chinese patent CN107975939A discloses a biomass water tube boiler with fully combustible fuel, and Chinese patent CN215863345U discloses a biomass boiler with a surrounding air distribution and oxygen supply high-temperature combustion chamber, both of which improve the combustion degree of biomass fuel through secondary air supply. Meanwhile, Chinese patent CN214802248U discloses a biomass burner for tobacco curing with a stepped combustion furnace, which optimizes and upgrades the furnace, dispersing flame density and thus reducing the emission of harmful gases. Summary of the Invention

[0005] The purpose of this invention is to provide a more environmentally friendly biomass heating stove that can effectively reduce smoke generation during biomass fuel combustion.

[0006] The technical solution of this invention is implemented as follows: a biomass heating stove, comprising:

[0007] A silo, used to store fuel;

[0008] The combustion chamber includes an upper furnace chamber and a lower furnace chamber, with a combustion cup and an ignition mechanism located in the lower furnace chamber.

[0009] A feeding mechanism, used to transport the fuel in the hopper to the combustion cup;

[0010] The air intake mechanism is used to supply air into the combustion chamber;

[0011] The multi-stage oxygen supply mechanism includes a secondary oxygen supply pipe and a tertiary oxygen supply pipe. The secondary oxygen supply pipe is used to supply oxygen to the downward furnace chamber, and the tertiary oxygen supply pipe is used to supply oxygen to the upward furnace chamber.

[0012] The exhaust system is used to remove the flue gas produced in the combustion chamber.

[0013] In the above-mentioned biomass heating stove, fuel is stored in a hopper during use. The feeding mechanism is activated to transport the fuel from the hopper to the combustion cup in the combustion chamber. The ignition mechanism ignites the fuel, causing it to burn in the lower furnace chamber. During the combustion process, the flame will rush into the upper furnace chamber, and the flue gas produced by the combustion will also enter the upper furnace chamber. During the fuel combustion process, the air intake mechanism will supply air to the combustion chamber to ensure the combustion of the fuel. At the same time, the secondary oxygen-aiding pipe supplies oxygen to the lower furnace chamber to increase the oxygen content in the lower furnace chamber and promote the combustion of the fuel. The tertiary oxygen-aiding pipe supplies oxygen to the upper furnace chamber to increase the oxygen content in the upper furnace chamber. In this way, under the action of the flame, the fixed small particles in the flue gas can be further burned. Finally, the remaining flue gas is discharged from the combustion chamber through the exhaust mechanism.

[0014] The present invention is further configured such that: the air intake mechanism includes an air intake slot and an air supply device, the air intake slot is provided in the bottom and side wall of the combustion cup, the air supply device is used to supply air to the air intake slot, and multiple air intake holes communicating with the air intake slot are provided on the inner wall and bottom surface of the combustion cup.

[0015] The present invention is further configured such that the feeding mechanism includes:

[0016] The first feeding pipe has an inlet end and an outlet end, and the first feeding auger is installed inside it;

[0017] The second feeding pipe is arranged parallel to the first feeding pipe below it, and has an inlet end and an outlet end on it. The second feeding auger is installed inside it.

[0018] The feeding chamber connects the discharge end of the first feeding pipe to the inlet end of the second feeding pipe;

[0019] The bottom of the hopper is connected to the inlet end of the first feeding pipe, and the outlet end of the second feeding pipe is connected to the combustion cup.

[0020] The present invention is further configured such that the feeding speed of the second feeding auger is greater than the feeding speed of the first feeding auger.

[0021] The invention is further configured such that one end of the second feeding auger near the discharge end of the second feeding pipe extends into the combustion cup.

[0022] Preferably, the inner wall of the combustion cup on the side away from the second feeding pipe is an upwardly inclined slope, and the outer wall of the combustion cup on the side away from the second feeding pipe is a downwardly inclined slope.

[0023] The invention is further configured such that: a backfire prevention pipe is provided on the second feeding pipe, the backfire prevention pipe is inclined toward the discharge end of the second feeding pipe, and the backfire prevention pipe can supply air to the discharge end of the second feeding pipe.

[0024] The present invention is further configured such that the smoke extraction mechanism includes:

[0025] Return to the smoking room;

[0026] The first exhaust pipe assembly has its first end connected to the upper furnace chamber and its second end connected to the return smoke chamber.

[0027] The smoke exhaust chamber is equipped with a ventilation device on its side wall;

[0028] The second smoke exhaust pipe assembly has its first end connected to the return smoke chamber and its second end connected to the exhaust smoke chamber.

[0029] The first and second exhaust pipe groups are distributed in parallel, and the flue gas flows in opposite directions in the first and second exhaust pipe groups.

[0030] The present invention is further configured such that: the multi-stage oxygen-assisting mechanism includes two secondary oxygen-assisting tubes and one tertiary oxygen-assisting tube, the inlet end of the secondary oxygen-assisting tube and the inlet end of the tertiary oxygen-assisting tube are connected to the same air inlet pipe, the two secondary oxygen-assisting tubes are arranged in parallel above the combustion cup, and multiple secondary oxygen-assisting holes are spaced apart on their bottom surfaces.

[0031] The outlet end of the three-stage oxygen-aiding pipe is provided with an annular end pipe. A connecting pipe is provided between the upper furnace liner and the lower furnace liner. The end pipe is sleeved on the outside of the connecting pipe. A three-stage oxygen-aiding groove is formed between the end pipe and the connecting pipe. Multiple three-stage oxygen-aiding holes communicating with the three-stage oxygen-aiding groove are provided circumferentially along the inner wall of the connecting pipe.

[0032] The invention is further configured such that: a stove platform is provided above the upper furnace liner, the stove platform is connected to the top of the upper furnace liner, and a sealing cover is provided between the stove platform and the upper furnace liner.

[0033] The beneficial effects of this invention are as follows:

[0034] 1. Based on the air supply mechanism to the combustion chamber, a multi-stage oxygen-assisted pipe is set up to supply oxygen to the upper and lower furnace chambers, so that the flame in the combustion chamber is more vigorous and the flame height is higher, which can further burn the smoke at the higher position, thereby reducing the concentration of smoke discharged from the combustion chamber and reducing the amount of smoke formed in the air.

[0035] 2. Feeding is carried out by two feeding augers, which has high feeding accuracy. The two feeding augers are set to differential feeding, so there will be no fuel accumulation in the feeding chamber. Even if the fuel staying in the second feeding pipe is accidentally ignited, it will not affect the fuel in the hopper, thus improving safety.

[0036] 3. By installing a backfire prevention pipe on the second feeding pipe, air is supplied to the discharge end of the second feeding pipe through the backfire prevention pipe. This makes it difficult for the flames in the combustion chamber to enter the second feeding pipe and ignite the fuel remaining in the second feeding pipe. At the same time, the ash produced after the fuel combustion is not easy to enter the second feeding pipe and cause blockage.

[0037] 4. Insert the end of the second feeding auger near the discharge end of the second feeding pipe into the combustion cup. This way, the ash generated in the combustion cup can be continuously pushed out during the feeding process of the second feeding auger, avoiding a large amount of ash from coking in the combustion cup and causing blockage that affects the combustion of fuel.

[0038] 5. By setting up a return smoke chamber, a first exhaust pipe group, and a second exhaust pipe group, the distance of the smoke discharge process is extended, which is conducive to the absorption of heat by the heating furnace. At the same time, the first exhaust pipe group and the second exhaust pipe group are designed to be parallel and the flow of flue gas is opposite to each other, which effectively limits the size of the heating furnace. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a cross-sectional view of the overall structure of the present invention.

[0041] Figure 2 for Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0042] Figure 3 This is a three-dimensional structural diagram of the smoke exhaust mechanism in this invention.

[0043] Figure 4 This is a first-direction three-dimensional structural diagram of the hopper, feeding mechanism, combustion cup, and multi-stage oxygen-assisted mechanism in this invention.

[0044] Figure 5 This is a schematic diagram of the second-direction three-dimensional structure of the hopper, feeding mechanism, combustion cup, and multi-stage oxygen-aiding mechanism in this invention.

[0045] Figure 6 This is a three-dimensional structural diagram of the hopper, feeding mechanism, combustion cup, and multi-stage oxygen-assisted mechanism in this invention.

[0046] The markings in the diagram are as follows:

[0047] 1-Burning bin, 201-Lower furnace chamber, 202-Upper furnace chamber, 3-Combustion cup, 4-Air inlet slot, 5-Air supply device, 6-First feeding pipe, 7-First feeding auger, 8-Second feeding pipe, 9-Second feeding auger, 10-Feeding chamber, 1101-First backfire prevention pipe, 1102-Second backfire prevention pipe, 12-Smoke return chamber, 13-First exhaust pipe assembly, 14-Smoke exhaust chamber, 15-Second exhaust pipe assembly, 16-Secondary oxygen supply pipe, 1601-Secondary oxygen supply hole, 17-Tertiary oxygen supply pipe, 18-End pipe, 19-Connecting pipe, 20-Tertiary oxygen supply hole, 2101-First air inlet pipe, 2102-Second air inlet pipe, 22-Stove platform, 23-Sealing cover, 24-Ignition mechanism, 25-Induced draft device. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Example 1

[0050] like Figures 1-6 As shown, this embodiment discloses a biomass heating stove, comprising: a hopper 1 for storing fuel; a combustion chamber including an upper furnace liner 202 and a lower furnace liner 201, wherein the lower furnace liner 201 is provided with a combustion cup 3 and an ignition mechanism 24; a feeding mechanism for conveying fuel from the hopper 1 to the combustion cup 3; an air inlet mechanism for supplying air to the combustion chamber; a multi-stage oxygen-aiding mechanism including a secondary oxygen-aiding pipe 16 and a tertiary oxygen-aiding pipe 17, wherein the secondary oxygen-aiding pipe 16 supplies oxygen to the lower furnace liner 201 and the tertiary oxygen-aiding pipe 17 supplies oxygen to the upper furnace liner 202; and a flue gas exhaust mechanism for exhausting the flue gas generated in the combustion chamber.

[0051] In this embodiment: the bottom of the silo 1 is provided with a discharge port connected to a feeding mechanism. The feeding mechanism includes a first feeding pipe 6 and a second feeding pipe 8, both of which are horizontally and parallel. A first feeding auger 7 is arranged along the length of the first feeding pipe 6, and a second feeding auger 9 is arranged along the length of the second feeding pipe 8. The first feeding auger 7 and the second feeding auger 9 are driven by external driving devices. The upper sidewall of the first feeding pipe 6 is connected to the discharge port. The fuel in the silo 1... The fuel can enter the first feeding pipe 6 through the discharge port and be conveyed by the first feeding auger 7. The discharge port is also the inlet end of the first feeding pipe 6. A vertical feeding chamber 10 is provided between the first feeding pipe 6 and the second feeding pipe 8. The upper end of the feeding chamber 10 is connected to the discharge end of the first feeding pipe 6, and the lower end of the feeding chamber 10 is connected to the inlet end of the second feeding pipe 8. After being conveyed by the first feeding auger 7, the fuel enters the feeding chamber 10 and, under the action of gravity, enters the second feeding pipe 8 and is conveyed by the second feeding auger 9.

[0052] The combustion chamber includes an upper furnace liner 202 and a lower furnace liner 201. The upper furnace liner 202 and the lower furnace liner 201 serve as the place for fuel combustion. A combustion cup 3 is installed in the lower furnace liner 201. The combustion cup 3 is fixed to the side of the lower furnace liner 201 near the feeding mechanism by a fixing plate. The discharge end of the second feeding pipe 8 passes through the side wall of the combustion cup 3 and extends into the combustion cup 3. The fuel is transported into the combustion cup 3 by the second feeding auger 9.

[0053] The ignition mechanism 24 includes an ignition rod and an ignition tube. The first end of the ignition tube is connected to the ignition rod, and the second end of the ignition tube extends into the combustion cup 3 after passing through the side wall of the combustion cup 3. The fuel entering the combustion cup 3 can be ignited by the ignition mechanism 24.

[0054] The air intake mechanism includes an air intake duct 4 and an air supply device 5. Please refer to [link / reference]. Figure 1 The air inlet slot 4 is located in the bottom and side wall of the combustion cup 3. The air supply device 5 is used to supply air to the air inlet slot 4. Multiple air inlet holes communicating with the air inlet slot 4 are provided on the inner wall and bottom surface of the combustion cup 3. During the fuel combustion process, the air supply device 5 is activated to supply air to the air inlet slot 4. This air is blown to the burning fuel through multiple air inlet holes to provide appropriate oxygen to the combustion chamber to aid fuel combustion. The air supply device 5 here can be, but is not limited to, a blower.

[0055] Please see Figures 4-5The multi-stage oxygen-assisting mechanism includes two secondary oxygen-assisting pipes 16 and one tertiary oxygen-assisting pipe 17. The inlet ends of the secondary oxygen-assisting pipes 16 and tertiary oxygen-assisting pipes 17 are connected to the same air inlet pipe. In this embodiment, the air inlet pipe includes a first air inlet pipe 2101 and a second air inlet pipe 2102. The first end of the first air inlet pipe 2101 is connected to a conversion chamber. The inlet ends of the two secondary oxygen-assisting pipes 16 and the tertiary oxygen-assisting pipe 17 are all connected to the conversion chamber. The first end of the second air inlet pipe 2102 is connected to the air supply device 5. The second end of the second air inlet pipe 2102 is connected to the second end of the first air inlet pipe 2101 through a flexible hose (the flexible hose is not shown in the figure).

[0056] Two secondary oxygen-aiding pipes 16 are arranged in parallel above the combustion cup 3, and multiple secondary oxygen-aiding holes 1601 are spaced apart on their bottom surfaces. During fuel combustion, the air supply device 5 is activated to supply air to the lower furnace 201 through the air inlet pipe, conversion chamber, secondary oxygen-aiding pipes 16, and secondary oxygen-aiding holes 1601. Due to the orientation of the secondary oxygen-aiding holes 1601, this part of the air is blown out from top to bottom in the lower furnace 201, which can form convection with the air entering from the air inlet hole, so that the fuel and oxygen can fully contact each other.

[0057] The outlet end of the three-stage oxygen-aiding pipe 17 is provided with an annular end pipe 18. A connecting pipe 19 is provided between the upper furnace liner 202 and the lower furnace liner 201. The end pipe 18 is sleeved on the outside of the connecting pipe 19, and a three-stage oxygen-aiding groove is formed between the end pipe 18 and the connecting pipe 19. Multiple three-stage oxygen-aiding holes 20 communicating with the three-stage oxygen-aiding groove are provided circumferentially on the inner wall of the connecting pipe 19. During the fuel combustion process, the air supply device 5 supplies air to the connecting pipe 19 through the air inlet pipe, the conversion chamber, the three-stage oxygen-aiding pipe 17, the three-stage oxygen-aiding groove, and the three-stage oxygen-aiding pipe 17. This part of the air is blown out from the edge to the middle in the connecting pipe 19. During the fuel combustion process, the flame will pass through the connecting pipe 19 and enter the upper furnace liner 202. In this process, the flame will bring this part of the air into the upper furnace liner 202, so that the solid particles in the flue gas rising into the upper furnace liner 202 will be further fully burned under the action of this part of the air and the flame.

[0058] Please see Figure 1 and Figure 3 In this embodiment, the flue gas exhaust mechanism is installed on the upper furnace liner 202 to exhaust the remaining flue gas.

[0059] Through the above technical solution, the fuel is mainly burned in the lower furnace chamber 201. The air supply and oxygenation effect of the air intake mechanism and the secondary oxygenation pipe 16 make the fuel combustion process in the lower furnace chamber 201 more complete. At the same time, the air supply and oxygenation effect of the tertiary oxygenation pipe 17 allows the flue gas rising into the upper furnace chamber 202 to be fully burned again before being discharged, reducing the content of fixed small particles in the flue gas discharged from the heating furnace and reducing the amount of smoke formed in the air due to the use of the heating furnace.

[0060] In this embodiment: Please refer to Figure 1 The heater also includes an outer shell and a base. The outer shell covers the exterior of all the components of the heater, and the base is equipped with casters to facilitate the movement of the heater. The ignition mechanism 24, the drive device, and the air supply device 5 can all be controlled electrically.

[0061] Example 2

[0062] This embodiment discloses a biomass heating stove. The difference between this embodiment and the biomass heating stove in Embodiment 1 is that, in this embodiment, the feeding speed of the second feeding auger 9 is greater than the feeding speed of the first feeding auger 7.

[0063] Because the fuel in the second feeding pipe 8 is continuous when the second feeding auger 9 feeds the fuel into the combustion cup 3, it is very likely that the fuel entering the combustion cup 3 will not fall completely to the bottom of the combustion cup 3. In this case, when the fuel at the outlet port of the second feeding pipe 8 is ignited, the flame or flame will enter the second feeding pipe 8 and ignite the fuel inside the second feeding pipe 8, which is very dangerous.

[0064] In this embodiment, there is a certain gap between the first feeding pipe 6 and the second feeding pipe 8, so that there is a certain height difference between the upper and lower ends of the feeding chamber 10. When the feeding speed of the second feeding auger 9 is set to be faster than the feeding speed of the first feeding auger 7, the fuel fed into the feeding chamber 10 by the first feeding auger 7 will be quickly sent away from the lower end of the feeding chamber 10 after contacting the second feeding auger 9. In this way, fuel will not accumulate in the feeding chamber 10. Even if the fuel in the second feeding pipe 8 is ignited, the fire will not spread to the silo 1 along the feeding chamber 10 and the first feeding pipe 6, so as to control the fire in time and reduce losses.

[0065] Example 3

[0066] This embodiment discloses a biomass heating stove, which differs from the biomass heating stoves of Embodiment 1 and / or Embodiment 2 in that, in this embodiment, the second feeding auger 9 also has an ash pushing function.

[0067] Fuel produces ash during combustion, and the heating stove needs to continuously supply and burn fuel during operation. Therefore, a large amount of ash is generated in the combustion cup 3. If this ash is not disposed of in time, the following problems will occur: First, the ash will occupy a lot of space in the combustion cup 3, making it impossible for the fuel in the second feeding pipe 8 to enter the combustion cup 3 smoothly, or the fuel will be pushed into the second feeding pipe 8 by the ash clumps after it is ignited; Second, the ash or the ash clumps will block the air inlet, affecting the oxygen supply below the combustion cup 3.

[0068] Therefore, in this embodiment, please refer to Figure 1 and Figure 5 The end of the second feeding auger 9 near the discharge end of the second feeding pipe 8 extends into the combustion cup 3; the inner wall of the combustion cup 3 on the side away from the second feeding pipe 8 is an upward inclined surface, and the outer wall of the combustion cup 3 on the side away from the second feeding pipe 8 is a downward inclined surface.

[0069] During the fuel conveying process of the second feeding auger 9, one end rotates within the combustion cup 3. During this process, the second feeding auger 9 breaks up the clumps of ash that have solidified in the combustion cup 3. Since the auger includes a shaft and spiral blades on the outer wall of the shaft, the ash is pushed up the inner wall of the combustion cup 3 on the side away from the second feeding pipe 8 by the blades. The outer wall of the combustion cup 3 on the side away from the second feeding pipe 8 is a downward-sloping surface. When the ash reaches the top of the side wall of the combustion cup 3, it falls down the outer wall of the combustion cup 3 on the side away from the second feeding pipe 8 under the influence of gravity into the ash collection space of the lower furnace chamber 201. Please refer to [link / reference]. Figure 1 A furnace door is installed on the side wall of the lower furnace chamber 201. Opening the furnace door allows for the cleaning of ash in the ash collection space.

[0070] Example 4

[0071] This embodiment discloses a biomass heating stove, which differs from the biomass heating stoves of Embodiment 1 and / or Embodiment 2 and / or Embodiment 3 in that, in this embodiment: in order to prevent the flame in the combustion cup 3 from entering the second feeding pipe 8, the applicant adds a backfire prevention pipe to the second feeding pipe 8.

[0072] Please see Figure 1 and Figure 4 and Figure 5 In this embodiment, the backfire prevention tube includes a first backfire prevention tube 1101 and a second backfire prevention tube 1102. The first backfire prevention tube 1101 is disposed on the side wall of the second feeding tube 8 near the discharge end. The first end of the first backfire prevention tube 1101 is connected to the interior of the second feeding tube 8 and is inclined toward the discharge end of the second feeding tube 8. The first end of the second backfire prevention tube 1102 is connected to the air supply device 5. The second end of the second backfire prevention tube 1102 is connected to the second end of the first backfire prevention tube 1101 through a hose (the hose is not shown in the figure).

[0073] During fuel combustion, the air supply device 5 is activated to send air through the second backfire prevention pipe 1102, the hose, and the first backfire prevention pipe 1101 into the second feeding pipe 8 and blow it toward the discharge end of the second feeding pipe 8. In this way, even if the flame in the combustion cup 3 tends to enter the second feeding pipe 8, it will be blown outward at the discharge end of the second feeding pipe 8, thus preventing the second feeding pipe 8 from entering and avoiding the fuel in the second feeding pipe 8 from being ignited and causing losses.

[0074] Example 5

[0075] This embodiment discloses a biomass heating stove, which differs from the biomass heating stoves of Embodiment 1 and / or Embodiment 2 and / or Embodiment 3 and / or Embodiment 4 in that: in this embodiment, the smoke exhaust mechanism is further defined;

[0076] In this embodiment: the smoke exhaust mechanism includes a return smoke chamber 12, a first smoke exhaust pipe group 13, a second smoke exhaust pipe group 15, and a smoke exhaust chamber 14. The return smoke chamber 12 is located above the upper furnace shell 202 on one side. The first end of the first smoke exhaust pipe group 13 is connected to the side wall of the upper furnace shell 202, and the second end of the first smoke exhaust pipe group 13 is connected to the bottom surface of the return smoke chamber 12. The smoke exhaust chamber 14 is located below the return smoke chamber 12, and an induced draft device 25 is provided on the side wall of the smoke exhaust chamber 14. The induced draft device 25 can be a blower or other exhaust structure. The first end of the second smoke exhaust pipe group 15 is connected to the bottom surface of the return smoke chamber 12, and the second end of the second smoke exhaust pipe group 15 is connected to the smoke exhaust chamber 14.

[0077] Since the flue gas can still burn in the upper furnace chamber 202, it contains a lot of heat when it enters the first exhaust pipe group 13. If it is directly discharged, the heat will be wasted, which is a pity. Therefore, with the above settings, after the flue gas enters the first exhaust pipe group 13 from the upper furnace chamber 202, it will first come to the return smoke chamber 12. The flue gas rushes upwards to the inner top wall of the return smoke chamber 12, and then bounces down through the inner top wall of the return smoke chamber 12 into the second exhaust pipe group 15. Subsequently, the flue gas enters the exhaust chamber 14 and is discharged from the heating furnace by the induced draft device 25. This extends the flue gas movement path during the exhaust process, so that the heat attached to the flue gas can be fully absorbed in the heating furnace.

[0078] Throughout the smoke exhaust process, the induced draft device 25 remains open, which helps to guide the flue gas in the return smoke chamber 12 to the second smoke exhaust pipe group 15.

[0079] Since the flue gas still contains some impurities and small solid particles, some of these impurities and small solid particles will adhere to the top wall of the flue gas return chamber 12 when the flue gas comes into contact with it. Over time, these impurities and small solid particles will accumulate in the flue gas return chamber 12. Therefore, a removable cleaning plate is installed at the top of the flue gas return chamber 12. The cleaning plate is connected to the inside of the flue gas return chamber 12, so the flue gas return chamber 12 can be cleaned by periodically removing the cleaning plate.

[0080] In this embodiment, the first exhaust pipe group 13 includes five exhaust pipes, and the second exhaust pipe group 15 includes four exhaust pipes.

[0081] Example 6

[0082] This embodiment discloses a biomass heating stove, which differs from the biomass heating stoves of Embodiment 1 and / or Embodiment 2 and / or Embodiment 3 and / or Embodiment 4 and / or Embodiment 5 in that, in this embodiment: a stove platform 22 is provided above the upper furnace liner 202, the stove platform 22 is connected to the top of the upper furnace liner 202, and a sealing cover 23 is provided between the stove platform 22 and the upper furnace liner 202.

[0083] Please see Figure 1 and Figure 3 The stove platform 22 is located above the upper furnace 202. The stove platform 22 includes a flue pipe and a platform. The flue pipe is a ring-shaped body. The lower end of the flue pipe is connected to the top of the upper furnace 202, and the upper end of the flue pipe protrudes from the platform surface. When the flame in the combustion chamber rushes into the upper furnace 202, it can continue upward along the flue pipe. The sealing cover 23 is detachably installed on the upper end of the flue pipe. When the sealing cover 23 covers the upper end of the flue pipe, the flue gas and heat in the upper furnace 202 will not come out through the flue pipe. After removing the sealing cover 23, a heat-receiving body can be placed on the upper end of the flue pipe. The heat-receiving body can be a frying pan or a water boiling pot, etc. At this time, the stove platform 22 is equivalent to the earthen stove used in rural areas. Due to the action of the induced draft device 25, the flue gas in the upper furnace 202 will preferentially enter the flue pipe.

[0084] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0085] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0086] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

Claims

1. A biomass heating stove, characterized in that, include: The silo (1) is used to store fuel; The combustion chamber includes an upper furnace chamber (202) and a lower furnace chamber (201), wherein the lower furnace chamber (201) is provided with a combustion cup (3) and an ignition mechanism (24). A feeding mechanism is used to transport the combustion in the hopper (1) to the combustion cup (3); The air intake mechanism is used to supply air into the combustion chamber; A multi-stage oxygen-supporting mechanism includes a secondary oxygen-supporting pipe (16) and a tertiary oxygen-supporting pipe (17), wherein the secondary oxygen-supporting pipe (16) is used to supply oxygen to the lower furnace shell (201) and the tertiary oxygen-supporting pipe (17) is used to supply oxygen to the upper furnace shell (202). A smoke exhaust system for discharging the flue gas generated in the combustion chamber; The feeding mechanism includes: The first feeding pipe (6) has an inlet end and an outlet end, and the first feeding auger (7) is installed inside. The second feeding pipe (8) is arranged parallel to the first feeding pipe (6) below it, and has an inlet end and an outlet end on it. The second feeding auger (9) is installed inside it. The feeding chamber (10) connects the discharge end of the first feeding pipe (6) with the inlet end of the second feeding pipe (8); The bottom of the hopper (1) is connected to the inlet end of the first feeding pipe (6), and the outlet end of the second feeding pipe (8) is connected to the combustion cup (3). The end of the second feeding auger (9) near the discharge end of the second feeding pipe (8) extends into the combustion cup (3); The inner wall of the combustion cup (3) on the side away from the second feeding pipe (8) is an upward inclined surface, and the outer wall of the combustion cup (3) on the side away from the second feeding pipe (8) is a downward inclined surface. The multi-stage oxygen-assisting mechanism includes two secondary oxygen-assisting tubes (16) and one tertiary oxygen-assisting tube (17). The inlet ends of the secondary oxygen-assisting tubes (16) and the inlet ends of the tertiary oxygen-assisting tubes (17) are connected to the same air inlet pipe. The two secondary oxygen-assisting tubes (16) are arranged in parallel above the combustion cup (3), and their bottom surfaces are provided with multiple secondary oxygen-assisting holes (1601) spaced apart. The outlet end of the three-stage oxygen-aiding pipe (17) is provided with an annular end pipe (18). A connecting pipe (19) is provided between the upper furnace shell (202) and the lower furnace shell (201). The end pipe (18) is sleeved on the outside of the connecting pipe (19). A three-stage oxygen-aiding groove is formed between the end pipe (18) and the connecting pipe (19). A plurality of three-stage oxygen-aiding holes (20) communicating with the three-stage oxygen-aiding groove are provided circumferentially on the inner wall of the connecting pipe (19).

2. A biomass heating stove according to claim 1, characterized in that: The air intake mechanism includes an air intake slot (4) and an air supply device (5). The air intake slot (4) is located in the bottom and side wall of the combustion cup (3). The air supply device (5) is used to supply air to the air intake slot (4). The inner wall and bottom surface of the combustion cup (3) are provided with multiple air intake holes that connect to the air intake slot (4).

3. A biomass heating stove according to claim 1, characterized in that: The feeding speed of the second feeding auger (9) is greater than that of the first feeding auger (7).

4. A biomass heating stove according to claim 1, characterized in that: The second feeding pipe (8) is provided with a backfire prevention pipe, which is inclined toward the discharge end of the second feeding pipe (8) and can supply air to the discharge end of the second feeding pipe (8).

5. A biomass heating stove according to claim 1, characterized in that, The smoke extraction mechanism includes: Return smoke room (12); The first exhaust pipe group (13) has its first end connected to the upper furnace shell (202) and its second end connected to the return smoke chamber (12); The smoke exhaust chamber (14) has a ventilation device (25) on its side wall. The second smoke exhaust pipe assembly (15) has its first end connected to the return smoke chamber (12) and its second end connected to the smoke exhaust chamber (14); The first exhaust pipe group (13) and the second exhaust pipe group (15) are distributed in parallel, and the flue gas flows in opposite directions in the first exhaust pipe group (13) and the second exhaust pipe.

6. A biomass heating stove according to claim 1, characterized in that: A stove platform (22) is provided above the upper furnace liner (202), the stove platform (22) is connected to the top of the upper furnace liner (202), and a sealing cover (23) is provided between the stove platform (22) and the upper furnace liner (202).

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