A biomass fuel heating system

Abstract

The application discloses a biomass fuel heating system, belongs to the technical field of biomass utilization, and aims at solving the problem of low combustion efficiency caused by the insufficient mixing of cracking gas and oxidizing gas or oxidizing gas in the prior art. In the biomass fuel heating system, a diameter-expanded circular table and a rotating flow vane are coaxially arranged in a combustion inner cavity, a gap is formed between the outer wall of the diameter-expanded circular table and the inner wall of the combustion inner cavity, the rotating flow vane is sleeved on the outer wall of the diameter-expanded circular table, the inner end of the rotating flow vane is fixedly connected with the diameter-expanded circular table, the outer end of the rotating flow vane is fixedly connected with the inner wall of the combustion inner cavity, and the rotating flow vane is located in the gap between the outer wall of the diameter-expanded circular table and the inner wall of the combustion inner cavity. A plurality of rotating flow air holes are formed in the side wall of the combustion inner cavity, and the oxidizing gas is supplied into the combustion inner cavity through the rotating flow air holes. The application can be used for the combustion of biomass cracking gas.

Description

Technical Field

[0001] This invention belongs to the field of biomass utilization technology, and in particular relates to a biomass fuel heating system. Background Technology

[0002] Biomass pyrolysis gas, an important product of biomass energy conversion, is a gas produced by the carbonization of biomass under anaerobic or oxygen-deficient conditions. Its main components include hydrogen and carbon monoxide. Efficient combustion of biomass pyrolysis gas can convert it into useful energy forms such as heat and electricity, thereby achieving the effective utilization of biomass energy.

[0003] Existing biomass fuel heating equipment processes biomass pyrolysis gas by directly mixing and burning the pyrolysis gas with oxidizing gases or oxidizing gases, resulting in insufficient mixing and low combustion efficiency. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a biomass fuel heating system to solve the problem of low combustion efficiency caused by insufficient mixing of pyrolysis gas and oxidizing gas in the prior art.

[0005] The objective of this invention is mainly achieved through the following technical solutions.

[0006] This invention provides a biomass fuel heating system, comprising a pyrolysis gas inlet pipe, a combustion chamber, and a flue gas outlet pipe connected sequentially along the flow direction of the biomass pyrolysis gas;

[0007] The combustion chamber is equipped with an expanding frustum and swirl vanes coaxially arranged within it. There is a gap between the outer wall of the expanding frustum and the inner wall of the combustion chamber. The swirl vanes are fitted onto the outer wall of the expanding frustum, with the inner end of the vanes fixedly connected to the expanding frustum and the outer end of the vanes fixedly connected to the inner wall of the combustion chamber. The swirl vanes are located in the gap between the outer wall of the expanding frustum and the inner wall of the combustion chamber. Multiple swirl air holes are opened on the side wall of the combustion chamber, and oxidizing gases are supplied into the combustion chamber through the swirl air holes.

[0008] Furthermore, the biomass fuel heating system also includes an external gas supply chamber, and an internal combustion chamber is located inside the external gas supply chamber and is coaxially and fixedly connected to the external gas supply chamber.

[0009] Furthermore, an oxidizing gas supply port is opened on the side wall of the gas supply outer cavity, and there is a gap between the combustion inner cavity and the gas supply outer cavity.

[0010] Furthermore, the air supply cavity is a constant-diameter cylindrical structure.

[0011] Furthermore, the biomass fuel heating system also includes an igniter, the ignition end of which extends into the combustion chamber.

[0012] Furthermore, the outlet direction of the swirl air hole is set tangentially along the side wall of the combustion chamber.

[0013] Furthermore, the outlet direction of the swirl vent is inclined away from the direction of the cracked gas inlet pipe.

[0014] Furthermore, the pyrolysis gas inlet pipe and the flue gas outlet pipe are constant diameter pipes.

[0015] Furthermore, the combustion chamber includes an expansion section and a contraction section connected sequentially along the flow direction of the biomass pyrolysis gas. The expansion frustum and swirl blades are both located in the expansion section, and the swirl air holes are located on the side wall of the expansion section, on the side of the swirl blades away from the pyrolysis gas inlet pipe.

[0016] Furthermore, the swirl direction of the swirl orifice and the swirl blades is the same.

[0017] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0018] A) The biomass fuel heating system provided by this invention has dual swirls (i.e., cracked gas swirls and oxidizing gas swirls), which can realize multi-stage swirl distribution, optimize air distribution, and the formation of cracked gas swirls and oxidizing gas swirls can greatly prolong the mixing time and mixing path of cracked gas and oxidizing gas in the combustion chamber, thereby improving the mixing uniformity and mixing sufficiency of the two, promoting the complete combustion of the two, increasing the heat generated by the combustion of cracked gas, and realizing the full utilization of biomass fuel (i.e. cracked gas).

[0019] B) The biomass fuel heating system provided by the present invention has an expanded diameter truncated cone with the large end facing the flame direction, which can also block the flame and prevent the flame from flowing back to the other layer of the expanded diameter truncated cone, thus ensuring the combustion safety of the preheating burner and the carbon gas burner.

[0020] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0021] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0022] Figure 1 This is a schematic diagram of the biomass fuel heating system provided in Embodiment 1 of the present invention;

[0023] Figure 2This is a schematic diagram of the structure of the scattering tube in the biomass fuel heating system provided in Embodiment 1 of the present invention;

[0024] Figure 3 This is a schematic diagram of the carbonization component tube in the biomass fuel heating system provided in Embodiment 1 of the present invention.

[0025] Figure label:

[0026] 1-Cracked gas inlet pipe; 2-Combustion inner cavity; 3-Gas supply outer cavity; 4-Fluorite outlet pipe; 5-Igniter; 6-Expanding frustum; 7-Swirl vane; 8-Oxidation gas supply port; 9-Swirl air hole; 10-Carbonization assembly; 11-Flat bottom wall; 12-First diameter-reducing wall; 13-Second diameter-reducing wall; 14-Third diameter-reducing wall; 15-Constant diameter wall; 16-Cooling drive wheel; 17-Driver; 18-Speed ​​regulator; 19-Driving wheel; 20-Transmission belt; 21-Driven wheel; 22-Main drive gear; 23-First synchronous belt; 24-Second synchronous belt; 25-Third synchronous belt; 26-Fourth synchronous belt; 27-First drive wheel; 28-Second drive wheel; 29-Third drive wheel; 30-Fourth drive wheel; 31-Linkage wheel; 32-Cooling synchronous belt; 33-Central gas supply pipe assembly. Detailed Implementation

[0027] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0028] Example 1

[0029] This embodiment provides a biomass fuel heating system; see [link / reference] Figure 1 The combustion chamber includes a pyrolysis gas inlet pipe 1, a combustion chamber 2, and a flue gas outlet pipe 4 connected sequentially along the flow direction of the biomass pyrolysis gas. The combustion chamber 2 is provided with an expanded diameter frustum 6 and a swirl vane 7 arranged coaxially with the combustion chamber 2. There is a gap between the outer wall of the expanded diameter frustum 6 and the inner wall of the combustion chamber 2. The swirl vane 7 is sleeved on the outer wall of the expanded diameter frustum 6. The inner end of the swirl vane 7 is fixedly connected to the expanded diameter frustum 6, and the outer end of the swirl vane 7 is fixedly connected to the inner wall of the combustion chamber 2. The swirl vane 7 is located in the gap between the outer wall of the expanded diameter frustum 6 and the inner wall of the combustion chamber 2. Multiple swirl air holes 9 are opened on the side wall of the combustion chamber 2. Oxidizing gases (e.g., oxygen or air) are supplied into the combustion chamber 2 through the swirl air holes 9.

[0030] Compared with the prior art, the biomass fuel heating system provided in this embodiment has dual swirls (i.e., cracked gas swirl and oxidizing gas swirl), which can realize multi-stage swirl distribution, optimize air distribution, and the formation of cracked gas swirl and oxidizing gas swirl can greatly prolong the mixing time and mixing path of cracked gas and oxidizing gas in the combustion chamber 2, thereby improving the mixing uniformity and mixing fullness of the two, promoting the full combustion of the two, increasing the heat generated by the combustion of cracked gas, and realizing the full utilization of biomass fuel (i.e. cracked gas).

[0031] It should be noted that the arrangement of the expanded diameter frustum 6, with its large end facing the flame direction, can also block the flame and prevent it from flowing back to the other layer of the expanded diameter frustum 6, thus ensuring combustion safety.

[0032] It should be noted that the high-temperature flue gas generated by the above-mentioned biomass fuel heating system can be used for its own heating or as heating for other heat-demanding systems.

[0033] To enable the supply of oxidizing gases, the aforementioned biomass fuel heating system also includes a gas supply outer cavity 3. A combustion inner cavity 2 is located within and coaxially fixedly connected to the gas supply outer cavity 3. An oxidizing gas inlet 8 (oxidizing gas inlet) is provided on the side wall of the gas supply outer cavity 3. A gap exists between the combustion inner cavity 2 and the gas supply outer cavity 3. The oxidizing gas inlet 8, the gap between the combustion inner cavity 2 and the gas supply outer cavity 3, and the swirl air hole 9 constitute an oxidizing gas cyclone channel. The nested arrangement of the combustion inner cavity 2 and the gas supply outer cavity 3 allows for the simultaneous supply and thorough mixing of the two gases, effectively improving the structural compactness of the biomass fuel heating system.

[0034] Understandably, in order to ignite the cracked gas and oxidizing gas, the above-mentioned biomass fuel heating system also includes an igniter 5, the ignition end of which extends into the combustion chamber 2.

[0035] In order to further promote the swirling of oxidizing gas and provide the flow of cracked gas and oxidizing gas toward the flue gas outlet pipe 4, the outlet direction of the swirling air hole 9 is, exemplarily, arranged tangentially along the side wall of the combustion chamber 2 and inclined away from the cracked gas inlet pipe 1.

[0036] For example, the gas supply outer cavity 3 is a constant diameter cylinder structure, the pyrolysis gas inlet pipe 1 and the flue gas outlet pipe 4 are constant diameter pipes, the combustion inner cavity 2 includes an expansion section and a contraction section connected sequentially along the flow direction of biomass pyrolysis gas, the expansion truncated cone 6 and the swirl blade 7 are both located in the expansion section, the swirl air hole 9 is located on the side wall of the expansion section and is located on the side of the swirl blade 7 away from the pyrolysis gas inlet pipe 1, and the igniter 5 is located on the side of the swirl blade 7 away from the pyrolysis gas inlet pipe 1.

[0037] Thus, on the one hand, due to the expansion section and the constant diameter of the gas supply cavity 3, when the oxidizing gas is supplied from the oxidizing gas supply port 8 into the gap between the combustion cavity 2 and the gas supply cavity 3, the cross-section of the gap gradually decreases, causing the oxidizing gas velocity to continuously increase. It flows through the swirl hole 9 to form a high-speed swirling flow of oxidizing gas, which is then supplied into the gas supply cavity 3. On the other hand, due to the expansion frustum 6, the flow cross-section of the cracked gas is also reduced, the flow velocity of the cracked gas increases, and the flow resistance caused by the swirl blade 7 is reduced, allowing the cracked gas to flow smoothly through the swirl blade 7.

[0038] In summary, by employing a specific structure for the gas supply outer cavity 3 and the combustion inner cavity 2, as well as the specific positions of each component, it is possible to increase the flow rate of oxidizing gas and the flow rate of pyrolysis gas while achieving a nested structure of the gas supply outer cavity 3 and the combustion inner cavity 2. This enables the formation of two high-speed swirling streams, achieving thorough mixing of oxidizing gas and pyrolysis gas.

[0039] It is worth noting that the generation of two high-speed swirling streams may cause a decrease in gas pressure near the axis of the combustion chamber 2, resulting in a lower concentration of pyrolysis gas and oxidizing gas in this area, which affects the uniformity of combustion within the combustion chamber 2. Therefore, the aforementioned biomass fuel heating system also includes a double-helix central gas supply pipe assembly 33. Specifically, the central gas supply pipe assembly 33 is located within the combustion chamber 2 and is coaxially arranged with the combustion chamber 2. The central gas supply pipe assembly 33 includes a spiral pyrolysis gas supply pipe and a spiral gas supply pipe, which are intertwined to form a double-helix structure. Multiple pyrolysis gas nozzles are opened on the pyrolysis gas supply pipe, and the outlet direction of the pyrolysis gas nozzles is perpendicular to the side wall of the pyrolysis gas supply pipe. Multiple oxidizing gas nozzles are opened on the oxidizing gas supply pipe, and the outlet direction of the oxidizing gas nozzles is perpendicular to the side wall of the oxidizing gas supply pipe. The pyrolysis gas ejected from the pyrolysis gas nozzles has the same swirling direction as the pyrolysis gas flowing out of the swirl vane 7, and the oxidizing gas ejected from the oxidizing gas nozzles has the same swirling direction as the gas supplied from the swirl air hole 9. In this way, the double-helix central gas supply pipe group 33 can effectively compensate for the problem of low concentration of cracked gas and oxidizing gas in the central area, improve combustion uniformity, and at the same time, the cracked gas ejected from the cracked gas nozzle and the oxidizing gas ejected from the oxidizing gas nozzle are still two swirling streams, further improving the overall swirling flow of the airflow in the combustion chamber 2.

[0040] In order to further improve the cyclone effect and promote the uniformity of mixing of cracked gas and oxidizing gas, the swirl direction of the swirl hole 9 and the swirl blade 7 is the same.

[0041] Based on the structure of the above biomass fuel heating system, the flow and mixing process of pyrolysis gas and oxidizing gas is as follows:

[0042] The cracked gas is supplied into the expansion section through the cracked gas inlet pipe 1. In the expansion section, when it passes through the swirl vane 7, a swirling flow is generated, forming swirling cracked gas.

[0043] Oxidizing gas is sequentially supplied into the expansion section through the gap between the oxidizing gas supply port 8, the combustion inner cavity 2 and the gas supply outer cavity 3 and the swirling air hole 9, generating swirling flow and forming swirling oxidizing gas;

[0044] In the expansion section, the swirling cracked gas and the swirling oxidizing gas swirl synchronously and mix thoroughly. Ignition device 5 ignites the mixed gas, and the cracked gas burns to produce high-temperature flue gas.

[0045] To ensure the supply of pyrolysis gas, the aforementioned biomass fuel heating system also includes a carbonization assembly, a carbonization furnace, a heat storage buffer tank, a cyclone separator, and a tail gas dust collector. The carbonization assembly is located within the carbonization furnace. The carbonization gas outlet of the carbonization assembly and the carbonization gas outlet of the cooling auger pipe are sequentially connected to the combustion chamber 2 and the heat storage buffer tank. The flue gas outlet of the heat storage buffer tank is connected to the air inlet of the carbonization furnace, and the exhaust gas outlet of the carbonization furnace is sequentially connected to the cyclone separator and the tail gas dust collector.

[0046] The carbonization assembly divides the inner cavity of the carbonization furnace into an upper chamber and a lower chamber from top to bottom. The flue gas outlet of the heat storage tank is connected to the lower chamber through a scattering pipe. Thus, as the biomass moves within the carbonization assembly, the high-temperature flue gas from the heat storage tank is supplied to the lower chamber through the scattering pipe. The high-temperature flue gas heats the biomass within the carbonization assembly, causing it to carbonize. The low-temperature flue gas, after heat exchange with the biomass, enters the upper chamber and is discharged through the tail gas collection pipe, then enters the subsequent cyclone separator and tail gas dust collector for dust removal and purification.

[0047] For details regarding the structure of the scattering tube, please refer to [link / reference]. Figure 2 It includes a planar bottom wall 11 and a first narrowed-diameter wall 12, a second narrowed-diameter wall 13, a third narrowed-diameter wall 14, and a constant-diameter wall 15 connected sequentially on the planar bottom wall 11. The planar bottom wall 11 and the first narrowed-diameter wall 12, the second narrowed-diameter wall 13, the third narrowed-diameter wall 14, and the constant-diameter wall 15 constitute a tubular structure composed of multiple eccentrically oriented eccentrically oriented tubes. Scattering holes are provided on the first narrowed-diameter wall 12, the second narrowed-diameter wall 13, the third narrowed-diameter wall 14, and the constant-diameter wall 15. The end of the first narrowed-diameter wall 12 furthest from the second narrowed-diameter wall 13 serves as the air inlet of the scattering tube. This type of scattering tube can achieve uniform gas supply, thereby improving the uniformity of biomass carbonization.

[0048] For carbonized components, see Figure 3It includes multiple parallel carbonized auger tubes, each comprising a carbonized tube body, carbonized auger blades and a carbonized shaft housed within the tube body. The auger blades are fitted onto the outer wall of the shaft. In two adjacent carbonized auger tubes, the outlet of the upper tube body is connected to the inlet of the lower tube body. In other words, multiple carbonized tube bodies connected end to end form a zigzag biomass conveying pipeline. The spiral directions of two adjacent carbonized auger blades are opposite, and the carbonized shaft drives the blades to rotate, thus achieving biomass conveying. Multiple carbonization auger tubes are arranged in parallel, with the spiral directions of adjacent carbonization auger blades opposite. This enables multi-pass motion of the biomass, allowing it to exchange heat with high-temperature flue gas multiple times. This extends the heat exchange time between the biomass and the high-temperature flue gas, thereby extending the carbonization time of the biomass, improving heat transfer efficiency, reducing energy consumption costs, and enhancing the carbonization efficiency and quality of the biomass. At the same time, because multiple carbonization auger tubes are arranged in parallel, the overall length of the carbonization assembly and the installation space can be reduced while extending the carbonization path.

[0049] In order to cool the carbonized biomass, the above-mentioned biomass carbonization assembly also includes a cooling auger tube. The cooling auger tube is arranged in parallel with the carbonization auger tube. The cooling auger tube includes a cooling tube body, cooling auger blades and a cooling shaft disposed in the cooling tube body. The cooling auger blades are sleeved on the outer wall of the cooling shaft. The feed end of the cooling tube body is connected to the discharge end of the last carbonization tube body. The spiral direction of the cooling auger blades is opposite to the spiral direction of the last carbonization auger blades. The carbonized biomass is cooled through the cooling auger tube.

[0050] In order to simplify the structure of the carbonization component and enable the rotation of multiple carbonization shafts and cooling shafts, the above-mentioned biomass carbonization component also includes a drive component for driving the multiple carbonization shafts and cooling shafts to rotate synchronously.

[0051] Specifically, the drive assembly includes a driver 17, a speed regulator 18, and a synchronous pulley. The output shaft of the driver 17 is connected to the input end of the synchronous pulley via the speed regulator 18, and the output end of the synchronous pulley is connected to multiple carbonization shafts and cooling shafts respectively. In this way, the driver 17 drives multiple carbonization shafts and cooling shafts to rotate synchronously through the speed regulator 18 and the synchronous pulley, thereby realizing the conveying of biomass in the carbonization assembly.

[0052] In order to enable the connection between the driver 17 and the speed controller 18, the drive assembly also includes a drive wheel 19, a transmission belt 20 and a driven wheel 21. The drive wheel 19 is coaxially and fixedly connected to the output shaft of the driver 17, and the driven wheel 21 is coaxially and fixedly connected to the input shaft of the speed controller 18. One end of the transmission belt 20 is sleeved on the outer wall of the drive wheel 19, and the other end of the transmission belt 20 is sleeved on the outer wall of the driven wheel 21.

[0053] There are four carbonized auger tubes, namely the first carbonized auger tube, the second carbonized auger tube, the third carbonized auger tube, and the fourth carbonized auger tube. The first carbonized auger tube includes a first carbonized tube body, a first carbonized auger blade, and a first carbonized shaft. The second carbonized auger tube includes a second carbonized tube body, a second carbonized auger blade, and a second carbonized shaft. The third carbonized auger tube includes a third carbonized tube body, a third carbonized auger blade, and a third carbonized shaft. The fourth carbonized auger tube includes a fourth carbonized tube body, a fourth carbonized auger blade, and a fourth carbonized shaft.

[0054] Specifically, the structure of the synchronous belt pulley includes a main drive gear 22, a first synchronous belt 23, a second synchronous belt 24, a third synchronous belt 25, a fourth synchronous belt 26, a first drive wheel 27, a second drive wheel 28, a third drive wheel 29, a fourth drive wheel 30, a linkage wheel 31, a cooling synchronous belt 32, and a cooling drive wheel 16. The first drive wheel 27 is coaxially and fixedly connected to one end of the first carbonization shaft, the second drive wheel 28 is coaxially and fixedly connected to one end of the second carbonization shaft, the third drive wheel 29 is coaxially and fixedly connected to one end of the third carbonization shaft, the fourth drive wheel 30 is coaxially and fixedly connected to one end of the fourth carbonization shaft, the linkage wheel 31 is coaxially and fixedly connected to the other end of the fourth carbonization shaft, and the cooling drive wheel 16 is coaxially and fixedly connected to one end of the cooling shaft.

[0055] The main drive gear 22 is coaxially and fixedly connected to the output shaft of the speed regulator 18. One end of the second synchronous belt 24 and one end of the third synchronous belt 25 are both sleeved on the outer wall of the main drive gear 22. The other end of the second synchronous belt 24 is sleeved on the outer wall of the second drive wheel 28, and the other end of the third synchronous belt 25 is sleeved on the outer wall of the third drive wheel. One end of the first synchronous belt 23 is sleeved on the outer wall of the second drive wheel, and the other end of the first synchronous belt 23 is sleeved on the outer wall of the first drive wheel. One end of the fourth synchronous belt 26 is sleeved on the outer wall of the third drive wheel. The other end of the four synchronous belts 26 is fitted onto the outer wall of the fourth drive wheel 30, one end of the cooling synchronous belt 32 is fitted onto the outer wall of the linkage wheel 31, and the other end of the cooling synchronous belt 32 is fitted onto the outer wall of the cooling drive wheel 16. With this structure, the first carbonized auger tube, the second carbonized auger tube, the third carbonized auger tube, the fourth carbonized auger tube and the cooling auger tube can be synchronously rotated through a single driver 17. This can effectively improve the structural compactness and transmission efficiency of the drive assembly, reduce the number of power units, and lower costs and maintenance difficulty.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A biomass fuel heating system, characterized in that, It includes a pyrolysis gas inlet pipe, a combustion chamber, and a flue gas outlet pipe connected sequentially along the flow direction of the biomass pyrolysis gas; The combustion chamber is provided with an expanding frustum and a swirl vane arranged coaxially with the combustion chamber. There is a gap between the outer wall of the expanding frustum and the inner wall of the combustion chamber. The swirl vane is sleeved on the outer wall of the expanding frustum. The inner end of the swirl vane is fixedly connected to the expanding frustum, and the outer end of the swirl vane is fixedly connected to the inner wall of the combustion chamber. The swirl vane is located in the gap between the outer wall of the expanding frustum and the inner wall of the combustion chamber. Multiple swirl air holes are opened on the side wall of the combustion chamber. Oxidizing gas is supplied into the combustion chamber through the swirl air holes. The biomass fuel heating system also includes a carbonization assembly, a carbonization furnace, a heat storage buffer tank, and a double-helix central gas supply pipe assembly. The central gas supply pipe assembly is located within the combustion chamber and is coaxially arranged with it. The central gas supply pipe assembly includes a helical pyrolysis gas supply pipe and a helical oxidizing gas supply pipe, which are intertwined to form a double-helix structure. Multiple pyrolysis gas nozzles are provided on the pyrolysis gas supply pipe, with the outlet direction of the nozzles perpendicular to the sidewall of the pyrolysis gas supply pipe. Multiple oxidizing gas nozzles are provided on the oxidizing gas supply pipe, with the outlet direction of the nozzles perpendicular to the sidewall of the oxidizing gas supply pipe. The pyrolysis gas ejected from the pyrolysis gas nozzles interacts with the helical... The swirl direction of the cracked gas flowing out of the flow vanes is the same, and the swirl direction of the oxidizing gas ejected from the oxidizing gas nozzle is the same as that of the gas supplied from the swirl air hole; the carbonization assembly divides the inner cavity of the carbonization furnace into an upper furnace chamber and a lower furnace chamber from top to bottom, and the flue gas outlet of the heat storage buffer tank is connected to the lower furnace chamber through a scattering pipe; the scattering pipe includes a planar bottom wall and a first narrowed diameter wall, a second narrowed diameter wall, a third narrowed diameter wall and a constant diameter wall arranged on the planar bottom wall and connected in sequence. The planar bottom wall and the first narrowed diameter wall, the second narrowed diameter wall, the third narrowed diameter wall and the constant diameter wall constitute a tubular structure composed of multiple eccentric reducers, and scattering holes are opened on the first narrowed diameter wall, the second narrowed diameter wall, the third narrowed diameter wall and the constant diameter wall.

2. The biomass fuel heating system according to claim 1, characterized in that, The biomass fuel heating system also includes an external gas supply chamber, and the combustion chamber is located inside the external gas supply chamber and is coaxially and fixedly connected to the external gas supply chamber.

3. The biomass fuel heating system according to claim 2, characterized in that, An oxidizing gas supply port is provided on the side wall of the gas supply outer cavity, and there is a gap between the combustion inner cavity and the gas supply outer cavity.

4. The biomass fuel heating system according to claim 2, characterized in that, The air supply cavity is a constant diameter cylinder structure.

5. The biomass fuel heating system according to claim 1, characterized in that, The biomass fuel heating system also includes an igniter, the ignition end of which extends into the combustion chamber.

6. The biomass fuel heating system according to claim 1, characterized in that, The outlet direction of the swirl air hole is set tangentially along the side wall of the combustion chamber.

7. The biomass fuel heating system according to claim 6, characterized in that, The outlet direction of the swirl air hole is inclined away from the direction of the pyrolysis gas inlet pipe.

8. The biomass fuel heating system according to claim 1, characterized in that, The pyrolysis gas inlet pipe and flue gas outlet pipe are constant diameter pipes.

9. The biomass fuel heating system according to claim 1, characterized in that, The combustion chamber includes an expansion section and a contraction section connected sequentially along the flow direction of the biomass pyrolysis gas. The expansion frustum and swirl blades are both located in the expansion section. The swirl air holes are located on the side wall of the expansion section and on the side of the swirl blades away from the pyrolysis gas inlet pipe.

10. The biomass fuel heating system according to any one of claims 1 to 9, characterized in that, The swirl direction of the swirl holes and swirl blades is the same.

Images