A combustion system having fan-shaped heat exchange channels

Abstract

The utility model discloses a kind of combustion systems with fan-shaped heat exchange passageway, belong to combustion equipment technical field, including heat exchanger, combustion mechanism, heat exchanger is equipped with coaxial inner heat exchange tube and outer heat exchange tube, several pieces of heat conduction partition are equipped between outer heat exchange tube and inner heat exchange tube, heat exchange passageway is formed between two adjacent heat conduction partitions and several connecting ribs are equipped in heat exchange passageway;Heat exchange passageway includes alternately arranged air passageway and flue gas passageway, air passageway both ends are equipped with air inlet and exhaust port respectively, flue gas passageway both ends are equipped with flue gas inlet and smoke outlet respectively;Outer heat exchange tube outside is equipped with gas collection shell, and cold air cavity and flue gas cavity are formed in gas collection shell inside;Combustion mechanism is equipped with adjacent gas pipe and ignition electrode, and the end of gas pipe and ignition electrode is commonly equipped with combustion chamber in communication with hot air cavity;The combustion system of the utility model can improve the heat exchange efficiency between flue gas and combustion air.

Description

Technical Field

[0001] This utility model relates to the field of combustion equipment technology, specifically to a combustion system with a fan-shaped heat exchange channel. Background Technology

[0002] In industrial heat treatment furnaces and heating furnaces, most adopt combustion systems based on burners for heating. To improve fuel utilization, heat exchangers are usually installed in the combustion system to recover the heat carried in the flue gas and preheat the combustion air with this heat. To improve the heat exchange efficiency of the heat exchanger, channels for the flow of flue gas and combustion air need to be set inside the heat exchanger. During the flow, the heat in the flue gas is transferred to the combustion air through the channel walls or a medium with a high thermal conductivity. However, the channel settings for the flow of flue gas and combustion air in the heat exchangers of some current combustion systems are unreasonable, which affects the heat exchange efficiency between the flue gas and combustion air.

[0003] Based on the above, Chinese patent document CN111322889A discloses a self-preheating burner tube bundle heat exchange tube, a self-preheating burner, and a heat exchange method for improving the heat exchange efficiency of the self-preheating burner. The self-preheating burner tube bundle heat exchange tube includes an outer tube and an inner tube. One end of the inner tube extends out of the outer tube, and the other end extends into the outer tube. The inner tube consists of an inner tube inlet, an inner tube wall, and an inner tube outer inlet. The inner tube inlet is located inside the outer tube. The outer tube consists of an outer tube bottom, an outer tube wall, and an outer tube inlet. A gap is provided between the inner tube inlet and the outer tube bottom. The inner tube and the inner tube and the outer tube form a fluid flow channel.

[0004] The aforementioned patent documents disclose a heat exchange tube and burner that increase the heat exchange area by using thin-walled tube bundles as heat exchange elements. Combustion air exchanges heat with flue gas as it flows inside the thin-walled tube bundle. The thin-walled tube bundle increases the specific surface area of ​​the combustion air through the structure of inner and outer sleeves. However, during the heat exchange process, the flow direction of the combustion air and flue gas is the same. The temperature of the combustion air gradually increases while the temperature of the flue gas gradually decreases. This causes the heat transfer efficiency between the flue gas and the combustion air to gradually decrease as it approaches the flue gas outlet. Furthermore, the flue gas is prone to accumulating and forming fluid clusters as it flows through the large flue. These fluid clusters are difficult to fully contact with the surface of the thin-walled tube bundle, thus affecting the efficiency of heat transfer from the flue gas to the thin-walled tube bundle, and consequently affecting the heat exchange efficiency. Therefore, the heat exchange tube and burner in the aforementioned patent documents still have room for improvement. Utility Model Content

[0005] To address the technical deficiencies in the prior art, this utility model proposes a combustion system with a fan-shaped heat exchange channel, which solves the aforementioned technical problems and meets practical needs. The specific technical solution is as follows: A combustion system with a fan-shaped heat exchange channel includes a heat exchanger and a combustion mechanism. The heat exchanger has an inner heat exchange tube and an outer heat exchange tube that are coaxial and distributed inside and outside. A hot air cavity is formed inside the inner heat exchange tube. A plurality of heat-conducting baffles are provided between the outer heat exchange tube and the inner heat exchange tube. The plurality of heat-conducting baffles are arranged in an array with the inner heat exchange tube as the center. A heat exchange channel is formed between two adjacent heat-conducting baffles. A plurality of connecting ribs are provided inside the heat exchange channel and are fixedly connected to two adjacent heat-conducting baffles respectively. The heat exchange channel includes an air channel and a flue gas channel, which are arranged alternately around the inner heat exchange tube. The air channel has an air inlet and an exhaust port communicating with the hot air cavity at opposite ends, and the flue gas channel has a flue gas inlet and a flue gas outlet at opposite ends. The outer heat exchange tube is fitted with a gas collecting shell, and the gas collecting shell forms an independent cold air cavity and a flue gas cavity. The surface of the gas collecting shell is provided with an air inlet and a flue gas outlet that are respectively matched with the cold air cavity and the flue gas cavity. The cold air cavity is matched with the air inlet, and the flue gas cavity is matched with the flue gas outlet. The combustion mechanism is provided with an adjacent gas pipe and an ignition electrode. One end of the gas pipe outlet and the ignition end of the ignition electrode are fitted together with a combustion chamber, which is connected to a hot air cavity.

[0006] As a further technical solution of this utility model, the heat-conducting partition is provided with several turbulence protrusions and turbulence grooves on both sides of the surface. The turbulence protrusions and turbulence grooves are matched one by one and respectively provided on both sides of the heat-conducting partition.

[0007] As a further technical solution of this utility model, the heat-conducting baffle extends spirally from one end of the heat exchanger along the surface of the inner heat exchange tube to the other end of the heat exchanger, and a heat exchange channel is formed between two adjacent heat-conducting baffles that extend spirally along the surface of the inner heat exchange tube.

[0008] As a further technical solution of this utility model, the exhaust port passes through the inner heat exchange tube so that the air channel and the hot air cavity are interconnected. The air channel is provided with a closed end near the exhaust port so that the two heat-conducting baffles forming the air channel are fixedly connected. The exhaust port passes through the external heat exchange tube, which connects the flue gas channel and the flue gas chamber. The end of the flue gas channel near the exhaust port is provided with a closed end that fixes the two heat-conducting baffles that form the flue gas channel. The air inlet and flue gas inlet are located at opposite ends of the heat exchanger.

[0009] As a further technical solution of this utility model, the thickness of the heat-conducting partition is 2~5mm, and the distance between two adjacent heat-conducting partitions is 1~5mm.

[0010] As a further technical solution of this utility model, the gas pipe and the ignition electrode are both fixedly connected to the gas collecting shell, the gas pipe and the ignition electrode both extend along the hot air cavity, and the exhaust port is positioned to match the combustion chamber.

[0011] As a further technical solution of this utility model, an air intake pipe and a radiant pipe are provided between the heat exchanger and the combustion mechanism. One end of the air intake pipe is connected to the hot air cavity and the other end is connected to the combustion chamber. One end of the radiant pipe is connected to the combustion chamber and the other end is connected to the end of the heat exchanger that has a flue gas inlet.

[0012] The beneficial effects of this utility model are as follows: This utility model discloses a combustion system that achieves efficient heat exchange between flue gas and combustion air through a fan-shaped heat exchange channel. The flue gas generated after combustion flows in a relatively narrow heat exchange channel inside the heat exchanger, while the combustion air flows in a heat exchange channel adjacent to the flue gas. The flue gas and combustion air exchange heat through heat-conducting baffles. The narrow heat exchange channel makes it difficult for the flue gas and combustion air to accumulate and form fluid clumps. Furthermore, the connecting ribs can turbulent the fluid flowing inside the heat exchange channel, allowing both the flue gas and combustion air to fully contact the heat-conducting baffles. This ensures sufficient contact between the flue gas and combustion air with the heat-conducting baffles, improving heat transfer efficiency and enabling the combustion air to better enhance the combustion efficiency of the combustion mechanism after heat exchange. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a combustion system with a fan-shaped heat exchange channel. Figure 1 .

[0014] Figure 2 This is a schematic diagram of the structure of a heat exchanger for a combustion system with a fan-shaped heat exchange channel. Figure 1 .

[0015] Figure 3 yes Figure 2 A sectional view.

[0016] Figure 4 yes Figure 3 A partial schematic diagram of point A.

[0017] Figure 5 This is a front view of a heat exchanger in a combustion system with a fan-shaped heat exchange channel.

[0018] Figure 6 yes Figure 5 Sectional view at point BB.

[0019] Figure 7 yes Figure 6 A partial schematic diagram at point C.

[0020] Figure 8 This is a schematic diagram of a combustion system with a fan-shaped heat exchange channel. Figure 2 .

[0021] Figure 9 This is a schematic diagram of the structure of a heat exchanger for a combustion system with a fan-shaped heat exchange channel. Figure 2 .

[0022] Wherein: 1-Heat exchanger, 11-Inner heat exchange tube, 12-Outer heat exchange tube, 13-Hot air cavity, 14-Heat-conducting baffle, 141-Turbulence protrusion, 142-Turbulence groove, 15-Heat exchange channel, 151-Air channel, 152-Flue gas channel, 153-Air inlet, 154-Exhaust port, 155-Flue gas inlet, 156-Flue gas outlet, 16-Closed end, 2-Combustion mechanism, 21-Gas pipe, 22-Ignition electrode, 23-Combustion chamber, 3-Gas collection shell, 31-Cold air cavity, 32-Flue gas cavity, 33-Air inlet, 34-Flue gas outlet, 4-Inlet pipe, 5-Radiant tube. Detailed Implementation

[0023] The embodiments of this utility model will be described below with reference to the accompanying drawings and related examples. The embodiments of this utility model are not limited to the following examples, and this utility model relates to relevant necessary components in this technical field, which should be regarded as well-known technology in this technical field and can be known and mastered by those skilled in this technical field.

[0024] A combustion system with a fan-shaped heat exchange channel includes a heat exchanger 1 and a combustion mechanism 2. The heat exchanger 1 is provided with an inner heat exchange tube 11 and an outer heat exchange tube 12 that are coaxial and distributed inside and outside. A hot air cavity 13 is formed inside the inner heat exchange tube 11. A plurality of heat-conducting baffles 14 are provided between the outer heat exchange tube 12 and the inner heat exchange tube 11. The plurality of heat-conducting baffles 14 are arranged in an array with the inner heat exchange tube 11 as the center. A heat exchange channel 15 is formed between two adjacent heat-conducting baffles 14. A plurality of connecting ribs are provided inside the heat exchange channel 15, which are respectively fixedly connected to two adjacent heat-conducting baffles 14. The heat exchange channel 15 includes an air channel 151 and a flue gas channel 152. The air channel 151 and the flue gas channel 152 are arranged alternately around the inner heat exchange tube 11. The two opposite ends of the air channel 151 are respectively provided with an air inlet 153 and an exhaust port 154 communicating with the hot air cavity 13. The two opposite ends of the flue gas channel 152 are respectively provided with a flue gas inlet 155 and a flue gas outlet 156. An air collecting shell 3 is fitted on the outside of the external heat exchange tube 12. Inside the air collecting shell 3, there are independent cold air chambers 31 and flue gas chambers 32. The surface of the air collecting shell 3 is provided with an air inlet 33 and a flue gas outlet 34 that are respectively matched with the cold air chamber 31 and the flue gas chamber 32. The cold air chamber 31 is matched with the air inlet 153, and the flue gas chamber 32 is matched with the exhaust port 156. The combustion mechanism 2 is provided with an adjacent gas pipe 21 and an ignition electrode 22. One end of the gas pipe 21 and the ignition end of the ignition electrode 22 are fitted together with a combustion chamber 23, which is connected to the hot air chamber 13.

[0025] This utility model discloses a combustion system that achieves efficient heat exchange between flue gas and combustion air through a fan-shaped heat exchange channel, referring to... Figure 1 The combustion system mainly consists of a combustion mechanism 2 and a heat exchanger 1. The combustion mechanism 2 is mainly used to burn the mixture formed by mixing fuel and combustion air. The gas pipe 21 guides the gas to the combustion chamber 23 to mix with the combustion air. The ignition electrode 22 ignites the mixture by means of electric spark to achieve combustion. The heat generated by combustion is used for industrial heat treatment through direct heating or thermal radiation. The heat exchanger 1 is mainly used to exchange heat between the flue gas generated by combustion in the combustion mechanism 2 and the combustion air. The hot air formed by preheating the combustion air participates in combustion in the combustion mechanism 2, thereby improving combustion efficiency. Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 The heat exchanger 1 is mainly composed of an inner heat exchange tube 11 and an outer heat exchange tube 12 that are coaxial and distributed inside and outside. The space between the inner heat exchange tube 11 and the outer heat exchange tube 12 is divided into several fan-shaped heat exchange channels 15 by several heat-conducting baffles 14. The heat exchange channels 15 mainly serve as channels for the flow of combustion air or flue gas. The heat exchange channels 15 are composed of an air channel 151 for guiding the combustion air and a flue gas channel 152 for guiding the flue gas. The air channel 151 and the flue gas channel 152 are alternately arranged so that the fluids formed by the flow of combustion air and flue gas are adjacent to each other in sequence. The heat-conducting baffles 14 serve as the medium for heat exchange between flue gas and combustion air. During the flow of combustion air in the air channel 151, it can exchange heat with the flue gas in the two adjacent flue gas channels 152, and during the flow of flue gas in the flue gas channel 152, it can exchange heat with the combustion air in the two adjacent air channels 151. The gas collecting shell 3 guides the combustion air into the cold air chamber 31 through the air inlet 33. The combustion air in the cold air chamber 31 enters the air passage 151 through the air inlet 153. The flue gas generated after combustion enters the flue gas passage 152 through the flue gas inlet 155. During the heat exchange process, the heat carried by the flue gas is transferred to the combustion air and the temperature of the combustion air is raised to form hot air. The hot air enters the hot air chamber 13 through the exhaust port 154. After the heat exchange is completed, the flue gas enters the flue gas chamber 32 through the exhaust port 156 and is discharged from the flue gas outlet 34. It should be noted that the thickness of the heat-conducting baffle 14 is 2~5mm. If the heat-conducting baffle 14 is made of ceramic material, the thickness of the heat-conducting baffle 14 is preferably less than 3mm. If the heat-conducting baffle 14 is made of metal material, the thickness of the heat-conducting baffle 14 is preferably 2mm. The distance between two adjacent heat-conducting baffles 14 is 1~5mm. The distance between two adjacent heat-conducting baffles 14 is the width of the heat exchange channel 15. Since the cross-section of the heat exchange channel 15 is fan-shaped, the width of the heat exchange channel 15 is smaller at the end near the inner heat exchange tube 11 and larger at the end near the outer heat exchange tube 12. The width of the heat exchange channel 15 at the end with the smaller width is preferably less than 2mm, and the width of the heat exchange channel 15 at the end with the larger width is preferably less than 3mm. When the heat-conducting baffle 14 and the heat exchange channel 15 adopt the above parameters, the flue gas and combustion air are less likely to accumulate and form fluid clumps inside the relatively narrow heat exchange channel 15. Furthermore, the connecting ribs can turbulentize the fluid flowing inside the heat exchange channel 15, enabling the flue gas and combustion air to fully contact the heat-conducting baffle 14 to improve heat transfer efficiency. In addition, the connecting ribs can serve as a medium for heat transfer between adjacent heat-conducting baffles 14, avoiding thermal stress problems caused by temperature differences between different heat-conducting baffles 14, and enhancing the heat transfer efficiency inside the heat exchanger 1. It should be further explained that the heat exchanger 1 of this utility model is preferably made by 3D printing technology. During the manufacturing process, the heat exchanger 1 is formed by melting and stacking metal materials layer by layer along the axial extension direction of the heat exchanger 1 using a high-energy beam, or by solidifying ceramic slurry layer by layer along the axial extension direction of the heat exchanger 1 to form a green body, and then sintering the green body at high temperature after resin removal. The inner heat exchange tube 11, the outer heat exchange tube 12, the heat-conducting baffle 14, and the connecting ribs can be formed simultaneously during the manufacturing process of the heat exchanger 1. If adjacent structures are connected by welding or other methods, it is difficult to avoid the existence of connection gaps between the structures. These connection gaps will affect the heat conduction efficiency between the connected structures and the overall structural stability. The heat exchanger 1 of this utility model is made by the above-mentioned 3D printing method, which can form a continuous integral structure, which can avoid cracking of the welded structure due to stress, thereby improving the structural stability of the heat exchanger 1.

[0026] As one of the preferred embodiments of this utility model, refer to Figure 5 , Figure 6 , Figure 7Both sides of the heat-conducting baffle 14 are provided with several turbulence protrusions 141 and turbulence grooves 142. The turbulence protrusions 141 and turbulence grooves 142 are matched one by one and respectively provided on both sides of the heat-conducting baffle 14. On the surface of the heat-conducting baffle 14 on both sides of the same heat exchange channel 15, the turbulence protrusions 141 on the surface of the heat-conducting baffle 14 on one side will match the turbulence grooves 142 on the surface of the heat-conducting baffle 14 on the other side, so that the heat exchange channel 15 extends in a wave-like manner along the extension direction of the axis of the heat exchanger 1. Then the flue gas or combustion air will also flow in a wave-like manner inside the heat exchange channel 15, which can prolong the path and time of the flue gas and combustion air flowing inside the heat exchanger 1. During the flow of the flue gas or combustion air inside the heat exchange channel 15, it will be disturbed by the turbulence protrusions 141 and can collide with the heat-conducting baffle 14 multiple times, which is conducive to the flue gas fully releasing heat and the combustion air fully absorbing heat, thereby improving the heat exchange efficiency of the heat exchanger 1.

[0027] As one of the preferred embodiments of this utility model, the heat-conducting baffle 14 extends spirally from one end of the heat exchanger 1 along the surface of the inner heat exchange tube 11 to the other end of the heat exchanger 1. A heat exchange channel 15 is formed between two adjacent heat-conducting baffles 14, which extends spirally along the surface of the inner heat exchange tube 11. The spiral extension of the heat-conducting baffle 14 around the inner heat exchange tube 11 can also extend spirally around the inner heat exchange tube 11, so that the length of each heat exchange channel 15 is extended. The path and time of flue gas and combustion air flowing inside the heat exchange channel 15 can be extended, which is conducive to the flue gas fully releasing heat and the combustion air fully absorbing heat, thereby improving the heat exchange efficiency of the heat exchanger 1.

[0028] As one of the preferred embodiments of this utility model, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 The exhaust port 154 passes through the inner heat exchange tube 11, enabling the air passage 151 to communicate with the hot air cavity 13. The air passage 151 is provided with a closed end 16 near the exhaust port 154, which fixes the two heat-conducting baffles 14 forming the air passage 151. The flue gas outlet 156 passes through the outer heat exchange tube 12, enabling the flue gas passage 152 to communicate with the flue gas cavity 32. The flue gas passage 152 is provided with a closed end 16 near the exhaust port 156, which fixes the two heat-conducting baffles 14 forming the flue gas passage 152. The air inlet 153 and the flue gas inlet 155 are located at opposite ends of the heat exchanger 1. The heat exchanger 1 with the above structure allows the flue gas and combustion air to flow independently in adjacent heat exchange channels 15, and the two flow in opposite directions to achieve countercurrent heat exchange. As the flue gas flows inside the heat exchanger 1, its temperature will decrease and eventually be discharged through the exhaust port 156 near the closed end 16. Meanwhile, as the combustion air flows inside the heat exchanger 1, its temperature will increase and eventually be discharged through the exhaust port 154 near the closed end 16. This ensures that the low-temperature flue gas and low-temperature combustion air are matched inside the heat exchanger 1, and the high-temperature flue gas and high-temperature combustion air are matched, guaranteeing that the heat in the flue gas can be efficiently transferred to the combustion air.

[0029] As one of the preferred embodiments of this utility model, refer to Figure 1 Both the gas pipe 21 and the ignition electrode 22 are fixedly connected to the gas collecting shell 3. Both the gas pipe 21 and the ignition electrode 22 extend along the hot air cavity 13. The exhaust port 154 is positioned to match the combustion chamber 23. In the gas system of this utility model, the heat exchanger 1 and the combustion mechanism 2 can be integrated. This combustion system is mainly used for open flame heating. The combustion system performs open flame heating in equipment such as heating furnaces. The flue gas passage 152 is connected to the inside of the furnace through the flue gas inlet 155, so that the flue gas in the furnace can enter the heat exchanger 1 for heat exchange. The hot air formed after heat exchange is discharged from the exhaust port 154 and then directly mixed with the fuel in the combustion chamber 23 to participate in the combustion reaction. If the power of the combustion system is 100kW, the surface area of ​​the heat-conducting baffle 14 inside the heat exchanger 1 is not less than 4m². 2 It can meet the heating conditions of up to 1100℃, and the exhaust temperature of the flue gas after heat exchange is below 300℃.

[0030] As one of the preferred embodiments of this utility model, refer to Figure 8 , Figure 9 A gas vent pipe 4 and a radiant tube 5 are provided between the heat exchanger 1 and the combustion mechanism 2. One end of the gas vent pipe 4 is connected to the hot air cavity 13 and the other end is connected to the combustion chamber 23. One end of the radiant tube 5 is connected to the combustion chamber 23 and the other end is connected to the end of the heat exchanger 1 with a flue gas inlet 155. In the combustion system of this utility model, the heat exchanger 1 and the combustion mechanism 2 can be designed separately. This type of combustion system is mainly used for radiant tube heating. The combustion mechanism 2 burns at one end of the radiant tube 5 to generate a flame. The flue gas flows along the radiant tube 5 and radiates heat to the outside. It enters the heat exchanger 1 through the flue gas inlet 155 at the other end of the radiant tube 5 for heat exchange. The hot air formed after heat exchange leaves the hot air cavity 13 and flows to the combustion chamber 23 through the gas vent pipe 4 and mixes with the fuel to participate in the combustion reaction. If the power of the combustion system is 100kW, the surface area of ​​the heat-conducting baffle 14 inside the heat exchanger 1 is not less than 4m². 2 It can meet the heating conditions of up to 950℃, and the exhaust temperature of the flue gas after heat exchange is below 300℃.

[0031] In summary, this utility model discloses a combustion system that achieves efficient heat exchange between flue gas and combustion air through a fan-shaped heat exchange channel. The flue gas generated after combustion in the combustion mechanism 2 flows in a relatively narrow heat exchange channel 15 inside the heat exchanger 1. At the same time, the combustion air flows in the heat exchange channel 15 adjacent to the flue gas. The flue gas and combustion air exchange heat through the heat-conducting baffle 14. The heat exchange channel 15 is relatively narrow, making it difficult for the flue gas and combustion air to accumulate and form fluid clusters. Furthermore, the connecting ribs can turbulent the fluid flowing inside the heat exchange channel 15, allowing both the flue gas and combustion air to fully contact the heat-conducting baffle 14. This ensures that the flue gas and combustion air can fully contact the heat-conducting baffle 14 to improve heat transfer efficiency, enabling the combustion air to better enhance the combustion efficiency of the combustion mechanism 2 after heat exchange.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A combustion system with a fan-shaped heat exchange channel, comprising a heat exchanger (1) and a combustion mechanism (2), characterized in that, The heat exchanger (1) is provided with an inner heat exchange tube (11) and an outer heat exchange tube (12) that are coaxial and distributed inside and outside. A hot air cavity (13) is formed inside the inner heat exchange tube (11). Several heat-conducting baffles (14) are provided between the outer heat exchange tube (12) and the inner heat exchange tube (11). The several heat-conducting baffles (14) are arranged in an array with the inner heat exchange tube (11) as the center. A heat exchange channel (15) is formed between two adjacent heat-conducting baffles (14). Several connecting ribs are provided inside the heat exchange channel (15) that are fixedly connected to two adjacent heat-conducting baffles (14). The heat exchange channel (15) includes an air channel (151) and a flue gas channel (152). The air channel (151) and the flue gas channel (152) are arranged alternately around the inner heat exchange tube (11). The air channel (151) is provided with an air inlet (153) and an exhaust port (154) communicating with the hot air cavity (13) at opposite ends. The flue gas channel (152) is provided with a flue gas inlet (155) and a flue gas outlet (156) at opposite ends. The external heat exchange tube (12) is fitted with a gas collecting shell (3) on the outside. The gas collecting shell (3) forms an independent cold air cavity (31) and a flue gas cavity (32) inside. The surface of the gas collecting shell (3) is provided with an air inlet (33) and a flue gas outlet (34) that match the cold air cavity (31) and the flue gas cavity (32) respectively. The cold air cavity (31) is matched with the air inlet (153), and the flue gas cavity (32) is matched with the exhaust port (156). The combustion mechanism (2) is provided with an adjacent gas pipe (21) and an ignition electrode (22). The outlet end of the gas pipe (21) and the ignition end of the ignition electrode (22) are together fitted with a combustion chamber (23), and the combustion chamber (23) is connected to the hot air cavity (13).

2. The combustion system with a fan-shaped heat exchange channel according to claim 1, characterized in that, The heat-conducting baffle (14) has several turbulence protrusions (141) and turbulence grooves (142) on both sides of its surface. The turbulence protrusions (141) and turbulence grooves (142) are matched one by one and respectively provided on both sides of the heat-conducting baffle (14).

3. The combustion system with a fan-shaped heat exchange channel according to claim 1, characterized in that, The heat-conducting baffle (14) extends spirally from one end of the heat exchanger (1) along the surface of the inner heat exchange tube (11) to the other end of the heat exchanger (1), and a heat exchange channel (15) is formed between two adjacent heat-conducting baffles (14) extending spirally along the surface of the inner heat exchange tube (11).

4. The combustion system with a fan-shaped heat exchange channel according to claim 1, characterized in that, The exhaust port (154) passes through the inner heat exchange tube (11) so that the air channel (151) and the hot air cavity (13) are connected to each other. The air channel (151) near the exhaust port (154) is provided with a closed end (16) that fixes the two heat-conducting baffles (14) forming the air channel (151). The exhaust port (156) passes through the external heat exchange tube (12) so that the flue gas passage (152) and the flue gas chamber (32) are interconnected. The end of the flue gas passage (152) near the exhaust port (156) is provided with a closed end (16) that fixes the two heat-conducting baffles (14) forming the flue gas passage (152). The air inlet (153) and the flue gas inlet (155) are located at opposite ends of the heat exchanger (1).

5. The combustion system with a fan-shaped heat exchange channel according to claim 1, characterized in that, The thickness of the heat-conducting partition (14) is 2~5mm, and the distance between two adjacent heat-conducting partitions (14) is 1~5mm.

6. The combustion system with a fan-shaped heat exchange channel according to claim 1, characterized in that, The gas pipe (21) and the ignition electrode (22) are both fixedly connected to the gas collection shell (3). The gas pipe (21) and the ignition electrode (22) extend along the hot air cavity (13). The exhaust port (154) is positioned to match the combustion chamber (23).

7. The combustion system with a fan-shaped heat exchange channel according to claim 1, characterized in that, The heat exchanger (1) and the combustion mechanism (2) are provided with an air intake pipe (4) and a radiation pipe (5). One end of the air intake pipe (4) is connected to the hot air cavity (13) and the other end is connected to the combustion chamber (23). One end of the radiation pipe (5) is connected to the combustion chamber (23) and the other end is connected to the end of the heat exchanger (1) that is provided with a flue gas inlet (155).

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