Combustion heating assembly and boiler

Abstract

The utility model discloses a kind of combustion heating assembly and boiler, wherein combustion heating assembly includes hearth, burner and flue gas heating pipeline, burner is located in hearth, flue gas heating pipeline is connected in hearth, spiral guide vane is equipped in flue gas heating pipeline, spiral guide vane is helically extended along the length direction of flue gas heating pipeline.The combustion heating assembly and boiler of the utility model can make high-temperature flue gas flow through flue gas heating pipeline for a longer time, and the heat exchange with water in the boiler drum is more sufficient, thereby effectively improving the working efficiency and energy-saving effect of the boiler.

Description

Technical Field

[0001] This utility model relates to the field of boiler equipment technology, and in particular to a combustion heating component and a boiler. Background Technology

[0002] Combustion heating components are crucial parts of boilers, significantly impacting their operating efficiency and energy-saving performance. A typical combustion heating component includes a furnace and flue gas heating pipes. The furnace houses a burner, and the flue gas heating pipes are connected to the furnace and located within the boiler drum. The burner ignites fuels such as natural gas to generate high-temperature flue gas, which then enters the flue gas heating pipes, heating the water in the boiler drum to form high-temperature steam.

[0003] In existing combustion heating components, the high-temperature flue gas flows through the exhaust heating pipe for a short time, resulting in insufficient heat exchange with the water in the boiler drum. This leads to low boiler efficiency, high fuel consumption, and poor energy-saving effect. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a combustion heating assembly that allows high-temperature flue gas to flow through the exhaust heating pipe for a longer period, resulting in more thorough heat exchange with the water in the boiler drum, thereby effectively improving the boiler's operating efficiency and energy-saving effect.

[0005] This utility model also proposes a boiler.

[0006] According to a first aspect of the present invention, a combustion heating assembly includes a furnace, a burner, and a flue gas heating pipe. The burner is disposed in the furnace, the flue gas heating pipe is connected to the furnace, and a spiral guide vane is provided inside the flue gas heating pipe, the spiral guide vane extending spirally along the length direction of the flue gas heating pipe.

[0007] The combustion heating assembly according to the embodiments of this utility model has at least the following beneficial effects: In this application, the flue gas heating pipe is located inside the boiler drum. The burner is used to burn fuels such as natural gas. The high-temperature flue gas generated by the fuel enters the flue gas heating pipe, thereby heating the water in the boiler drum to form high-temperature steam. When the high-temperature flue gas flows through the flue gas heating pipe, it is disturbed by the spiral guide vanes, which reduces the flow velocity. Moreover, the flow path of the high-temperature flue gas is increased by the guidance of the spiral guide vanes, which allows the high-temperature flue gas to flow through the flue gas heating pipe for a longer time, resulting in more complete heat exchange with the water in the boiler drum. This effectively improves the boiler's working efficiency and energy-saving effect.

[0008] According to some embodiments of the present invention, there are two exhaust heating pipes, which are respectively located on opposite sides of the furnace along the first direction. The exhaust heating pipe includes at least two pipe units arranged along the first direction, and at least two of the pipe units are connected in sequence to form a zigzag flow channel.

[0009] According to some embodiments of the present invention, the combustion heating assembly further includes two first connecting boxes, at least two second connecting boxes, and two third connecting boxes. The two first connecting boxes are connected to the furnace chamber, and the inner cavity of the first connecting box is in communication with the inner cavity of the furnace chamber. Two pipe units adjacent to the furnace chamber are respectively connected to the two first connecting boxes. One end of two adjacent pipe units is connected to the same second connecting box. The end of the outermost pipe unit is connected to the third connecting box, and the third connecting box is provided with an exhaust pipe.

[0010] According to some embodiments of the present invention, each pipe unit includes a plurality of parallel first pipes. In the same pipe unit, the same end of the plurality of first pipes is connected to the same first connecting box, the same second connecting box, or the same third connecting box.

[0011] According to some embodiments of the present invention, all the first tubes are provided with the spiral guide vanes; and / or, two first connecting boxes are respectively connected to opposite ends of the furnace along a second direction, the second direction being perpendicular to the first direction, the first connecting boxes extending along the first direction to form an extension protruding from the furnace, and a plurality of the first tubes of the tube unit adjacent to the furnace are connected to the extension.

[0012] According to some embodiments of the present invention, the furnace includes a combustion chamber and a gas collecting chamber, the burner is disposed in the combustion chamber, the gas collecting chamber is connected to the combustion chamber, and the flue gas heating pipe is connected to the gas collecting chamber.

[0013] According to some embodiments of the present invention, the combustion heating assembly further includes a preheating box and a preheating pipe. The preheating box is provided with an inlet pipe and an outlet pipe. The outlet pipe is used to connect to the boiler drum. The preheating pipe is located inside the preheating box and is connected to the flue gas heating pipe.

[0014] According to some embodiments of the present invention, the preheating pipe includes a plurality of parallel second pipes, and the combustion heating assembly further includes two fourth connecting boxes. The two fourth connecting boxes are connected to the preheating box. One of the fourth connecting boxes is connected to the flue gas heating pipe, and the other fourth connecting box is provided with an exhaust pipe for connecting to a fan. The two ends of the second pipe are respectively connected to the two fourth connecting boxes.

[0015] According to a second aspect of the present invention, a boiler includes a boiler drum and the combustion heating assembly described in the first aspect of the present invention, wherein the flue gas heating pipe is located inside the boiler drum.

[0016] The boiler according to the embodiments of this utility model has at least the following beneficial effects: This allows the high-temperature flue gas to flow through the exhaust heating pipe for a longer time, resulting in more thorough heat exchange with the water in the boiler drum, thereby effectively improving the boiler's working efficiency and energy-saving effect.

[0017] According to some embodiments of the present invention, the boiler further includes a water removal assembly, which includes a water removal section, a steam inlet pipe, and a steam outlet pipe. The water removal section is located at the top of the boiler drum and forms a water removal chamber. The top of the water removal section is provided with a steam outlet hole that communicates with the water removal chamber. The steam inlet pipe is connected to the water removal section and communicates with the water removal chamber. The steam outlet pipe communicates with the steam outlet hole.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and some of these additional aspects and advantages will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the combustion heating assembly. Figure 2 for Figure 1 A partial schematic diagram; Figure 3 This is a schematic diagram of the installation of the spiral guide vane; Figure 4 This is a schematic diagram showing the second tube being removed from the preheating box; Figure 5 This is a schematic diagram of the installation of the second pipe; Figure 6 This is a schematic diagram of the boiler structure; Figure 7 This is a schematic diagram of the installation of the water removal component.

[0020] Icon labels: Furnace 100; Combustion chamber 101; Gas collection chamber 102; Burner 200; Smoke exhaust heating pipe 300; spiral guide vane 301; pipe unit 302; first pipe 303; First connecting box 400; Extension 401; Second connecting box 500; Third connecting box 600; Exhaust pipe 601; Preheating box 700; Inlet pipe 701; Outlet pipe 702; Limiting grid 703; Preheating pipe 800; Second pipe 801; Fourth connecting box 900; air outlet pipe 901; Boiler drum 1000; Pressure relief valve 1001; Water removal assembly 1100; water removal section 1101; steam inlet pipe 1102; steam outlet pipe 1103; connection part 1104; Fan 1200; Casing 1300; Water inlet tank 1400. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0022] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0024] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0025] The following is for reference. Figures 1 to 7 This invention describes a combustion heating assembly and a boiler according to embodiments of the present invention.

[0026] like Figures 1 to 5 As shown, the combustion heating assembly according to the first aspect of the present invention includes a furnace 100, a burner 200, and a flue gas heating pipe 300.

[0027] The furnace 100 can form a combustion chamber 101, and a burner 200 can be installed in the combustion chamber 101. The burner 200 is used to burn fuels such as gas. Specifically, when the fuel is gas, the burner 200 can be connected to a gas cylinder, and the gas cylinder supplies gas to the burner 200. An igniter can also be installed in the combustion chamber 101 to ignite the gas.

[0028] The flue gas heating pipe 300 is connected to the furnace 100 and communicates with the inner cavity of the furnace 100. The flue gas heating pipe 300 can be located inside the boiler drum 1000. The flue gas heating pipe 300 is provided with a spiral guide vane 301, which extends spirally along the length of the flue gas heating pipe 300.

[0029] In this application, the flue gas heating pipe 300 is located inside the boiler drum 1000. The burner 200 is used to burn fuels such as natural gas. The high-temperature flue gas generated by the fuel enters the flue gas heating pipe 300, thereby heating the water in the boiler drum 1000 to form high-temperature steam. When the high-temperature flue gas flows through the flue gas heating pipe 300, it is disturbed by the spiral guide vanes 301, which reduces the flow velocity. Moreover, the flow path of the high-temperature flue gas is increased by the guide vanes 301. Thus, without lengthening the flue gas heating pipe 300, the high-temperature flue gas can flow through the flue gas heating pipe 300 for a longer time, resulting in more thorough heat exchange with the water in the boiler drum 1000. This effectively improves the boiler's working efficiency and energy-saving effect.

[0030] refer to Figure 1 and Figure 2 As shown, in some embodiments of this application, there are two exhaust heating pipes 300, which are located on opposite sides of the furnace 100 along the first direction. Each exhaust heating pipe 300 includes at least two pipe units 302 arranged along the first direction. Specifically, each exhaust heating pipe 300 may include two, three or more pipe units 302, for example, it may include two pipe units 302. At least two pipe units 302 are connected in sequence to form a zigzag flow channel.

[0031] In this embodiment, two flue gas heating pipes 300 are provided, which makes the discharge of high-temperature flue gas smoother, avoids blockage of high-temperature flue gas and explosion, and improves safety. The flue gas heating pipe 300 includes at least two pipe units 302 arranged along the first direction. At least two pipe units 302 are connected in sequence to form a zigzag flow channel. With this arrangement, given a fixed size of the boiler drum 1000, the total length of the flue gas heating pipe 300 can be longer, which in turn allows the high-temperature flue gas to flow through the flue gas heating pipe 300 for a longer time, resulting in more thorough heat exchange with the water in the boiler drum 1000. This can more effectively improve the working efficiency and energy saving effect of the boiler.

[0032] refer to Figure 1 and Figure 2 As shown, in some embodiments of this application, the combustion heating assembly further includes two first connecting boxes 400, at least two second connecting boxes 500, and two third connecting boxes 600. The two first connecting boxes 400 are connected to the furnace 100, and the inner cavity of the first connecting box 400 is connected to the inner cavity of the furnace 100. Two pipe units 302 adjacent to the furnace 100 are respectively connected to the two first connecting boxes 400 and are connected to the inner cavity of the first connecting boxes 400. One end of two adjacent pipe units 302 is connected to the same second connecting box 500 and is connected to the corresponding second connecting box 500. The end of the outermost pipe unit 302 is connected to the third connecting box 600 and is connected to the third connecting box 600. The third connecting box 600 is provided with an exhaust pipe 601, and the exhaust pipe 601 is connected to the third connecting box 600.

[0033] In this embodiment, a first connecting box 400 is provided to facilitate the connection between the pipe unit 302 adjacent to the furnace 100 and the furnace 100. A second connecting box 500 is provided to facilitate the connection of the ends of two adjacent pipe units 302 that need to be connected. A third connecting box 600 is provided to facilitate the connection between the end of the outermost pipe unit 302 and the exhaust pipe 601.

[0034] refer to Figure 1 and Figure 2 As shown, in some embodiments of this application, each pipe unit 302 includes a plurality of parallel first pipes 303. For example, a pipe unit 302 may include a plurality of groups of first pipes 303 arranged along a first horizontal direction. Each group of first pipes 303 may include a plurality of first pipes 303 arranged vertically. There is a gap between two adjacent first pipes 303. The first pipes 303 may extend along a second direction perpendicular to the first direction. In the same pipe unit 302, the same end of a plurality of first pipes 303 is connected to the same first connecting box 400, the same second connecting box 500, or the same third connecting box 600.

[0035] In this embodiment, each pipe unit 302 includes multiple parallel first pipes 303. This significantly increases the heat exchange area between the flue gas heating pipe 300 and the water in the boiler drum 1000, resulting in more thorough heat exchange and effectively improving the boiler's working efficiency and energy-saving effect. Furthermore, the invention includes a first connecting box 400, a second connecting box 500, and a third connecting box 600, making it easier to simultaneously install the multiple first pipes 303 of the pipe unit 302.

[0036] It should be noted that in some other embodiments of this utility model, the tube unit 302 may also include only a single tube, which will not be described in detail here.

[0037] refer to Figure 3As shown in some embodiments of this application, all first tubes 303 are provided with spiral guide vanes 301. This arrangement not only effectively increases the flow time of the high-temperature flue gas, allowing for more thorough heat exchange between the high-temperature flue gas and the water in the boiler drum 1000, thereby improving the boiler's working efficiency and energy-saving effect, but also ensures that the flow velocity of the high-temperature flue gas through all first tubes 303 is approximately the same, resulting in more uniform heating of the water in the boiler drum 1000 and a better heating effect.

[0038] refer to Figure 1 and Figure 2 As shown, in some embodiments of this application, two first connecting boxes 400 are respectively connected to opposite ends of the furnace 100 along a second direction, the second direction being perpendicular to the first direction. The first connecting boxes 400 extend along the first direction to form an extension 401 protruding from the furnace 100, and a plurality of first pipes 303 of the pipe unit 302 adjacent to the furnace 100 are connected to the extension 401.

[0039] In this embodiment, the original configuration not only makes it easier to arrange the flue gas heating pipe 300 and the two first connecting boxes 400, but also makes it easier to connect the multiple first pipes 303 of the pipe unit 302 adjacent to the furnace 100 to the corresponding first connecting boxes 400.

[0040] refer to Figure 1 and Figure 2 As shown, in some embodiments of this application, the furnace 100 includes a combustion chamber 101 and a gas collection chamber 102, the burner 200 is disposed in the combustion chamber 101, the gas collection chamber 102 is connected to the combustion chamber 101, and the flue gas heating pipe 300 is connected to the gas collection chamber 102.

[0041] In this embodiment, the burner 200 operates in the combustion chamber 101. The high-temperature flue gas generated first enters the gas collection chamber 102 and then enters the exhaust heating pipe 300. In this way, the flame generated when the burner 200 burns fuel such as gas can be prevented from burning the exhaust heating pipe 300.

[0042] refer to Figure 1 , Figure 4 and Figure 5 As shown, in some embodiments of this application, the combustion heating assembly further includes a preheating box 700 and a preheating pipe 800. The preheating box 700 is provided with a water inlet pipe 701 and a water outlet pipe 702. The water outlet pipe 702 is used to connect to the boiler drum 1000. The preheating pipe 800 is located inside the preheating box 700 and is connected to the flue gas heating pipe 300. Specifically, the preheating pipe 800 can be connected to the exhaust pipe 601, and thus indirectly connected to the flue gas heating pipe 300.

[0043] If the high-temperature flue gas, after heating the boiler drum 1000, is directly discharged, it will result in a waste of thermal energy. In this embodiment, after the high-temperature flue gas heats the water in the boiler drum 1000 through the flue gas heating pipe 300, it enters the preheating pipe. The residual heat of the high-temperature flue gas preheats the water in the preheating box 700. After the water in the preheating box 700 is heated to a higher temperature, it enters the boiler drum 1000. In this way, not only can the water in the boiler drum 1000 be heated to high-temperature steam more quickly, but the waste of thermal energy can also be greatly reduced, thereby making the boiler more efficient and energy-saving.

[0044] refer to Figure 5 As shown, in some embodiments of this application, the preheating pipe 800 includes a plurality of parallel second pipes 801 with gaps between adjacent second pipes 801. The combustion heating assembly also includes two fourth connecting boxes 900 connected to the preheating box 700. One of the fourth connecting boxes 900 is connected to the flue gas heating pipe 300, for example, the fourth connecting box 900 can be connected to the exhaust pipe 601. The other fourth connecting box 900 is provided with an exhaust pipe 901 for connecting to the fan 1200. The two ends of the second pipe 801 are respectively connected to the two fourth connecting boxes 900.

[0045] In this embodiment, the preheating pipe 800 includes multiple parallel second pipes 801. This significantly increases the heat exchange area between the preheating pipe 800 and the water in the preheating box 700, resulting in more thorough heat exchange and effectively improving the boiler's working efficiency and energy saving. Furthermore, the invention includes two fourth connecting boxes 900, facilitating the installation of the multiple second pipes 801 of the preheating pipe 800. One of the fourth connecting boxes 900 is equipped with an exhaust pipe 901, which connects to a fan 1200. The fan 1200 draws in flue gas, allowing the high-temperature flue gas to flow more smoothly within the exhaust heating pipe 300 and the preheating pipe 800.

[0046] It should be noted that the preheating pipe 800 can also be a single pipe, for example, it can be in the form of a coil.

[0047] refer to Figure 5 As shown, in some embodiments of this application, at least one end of the preheating box 700 is provided with a limiting grid 703, and a plurality of second tubes 801 are respectively inserted through a plurality of limiting holes in the limiting grid 703. In this embodiment, the limiting grid 703 can simultaneously limit the multiple second tubes 801, reducing the random movement of the second tubes 801 during welding to the fourth connecting box 900, thus improving the welding quality of the second tubes 801.

[0048] According to the boiler of the second aspect embodiment of the present utility model, reference is made to... Figure 6As shown, the boiler includes a boiler drum 1000 and the combustion heating assembly of the first aspect embodiment described above, with the flue gas heating pipe 300 located inside the boiler drum 1000. For example, the boiler may also include a shell 1300, a fan 1200, a water inlet tank 1400, and various pipes. The boiler drum 1000 is located inside the shell 1300, a pipe is provided between the water inlet tank 1400 and the boiler drum 1000, a float valve may be provided inside the water inlet tank 1400, the water inlet tank 1400 may be connected to the water outlet pipe 702 of the preheating box 700, and the fan 1200 is connected to the air outlet pipe 901.

[0049] The boiler in this embodiment allows the high-temperature flue gas to flow through the flue gas heating pipe 300 for a longer time, resulting in more thorough heat exchange with the water in the boiler drum 1000, thereby effectively improving the boiler's working efficiency and energy-saving effect.

[0050] Since the boiler can adopt all the technical solutions of the combustion heating assembly of the first aspect embodiment described above, it has at least all the beneficial effects brought about by the technical solutions of the first aspect embodiment described above. These additional beneficial effects will not be repeated here.

[0051] refer to Figure 7 As shown, in some embodiments of this application, the boiler further includes a dewatering assembly 1100. The dewatering assembly 1100 includes a dewatering section 1101, a steam inlet pipe 1102, and a steam outlet pipe 1103. The dewatering section 1101 is located at the top end of the boiler drum 1000 and forms a dewatering chamber. The top end of the dewatering section 1101 is provided with a steam outlet hole communicating with the dewatering chamber. The steam inlet pipe 1102 is connected to the dewatering section 1101 and communicates with the dewatering chamber. The steam inlet pipe 1102 communicates with the inner cavity of the boiler drum 1000. The steam outlet pipe 1103 communicates with the steam outlet hole. For example, the dewatering assembly 1100 may also include a connecting section 1104. The connecting section 1104 is provided with a communicating cavity. The connecting section 1104 is located at the top end of the dewatering section 1101 and covers the steam outlet hole. The communicating cavity communicates with the steam outlet hole. The steam outlet pipe 1103 is connected to the connecting section 1104 and communicates with the communicating cavity. After the water in the boiler drum 1000 is heated to form high-temperature steam, it enters the dewatering chamber of the dewatering section 1101 through the steam inlet pipe 1102, then enters the connecting chamber of the connecting section 1104 through the steam outlet hole, and finally is discharged through the steam outlet pipe 1103.

[0052] If high-temperature steam is discharged directly through a pipe, it will contain a large amount of liquid water, affecting the quality of the high-temperature steam. In this embodiment, the liquid water follows the high-temperature steam into the dehydration chamber, easily adheres to the inner wall of the dehydration chamber, and does not easily move upward to be discharged from the steam discharge hole at the top of the dehydration section 1101. As a result, most of the liquid water will remain in the dehydration chamber of the dehydration section 1101, thereby reducing the water content in the high-temperature steam discharged from the steam discharge pipe 1103 and improving the quality of the high-temperature steam.

[0053] refer to Figure 6 As shown in some embodiments of this application, a pressure relief valve 1001 is provided at the top of the boiler drum 1000. By providing the pressure relief valve 1001, when the gas pressure inside the boiler drum 1000 becomes too high, the pressure relief valve 1001 opens to release pressure, thereby preventing boiler explosion and improving safety.

[0054] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A combustion heating assembly, characterized in that, include: Furnace; The burner is located inside the furnace. A flue gas heating pipe is connected to the furnace. The flue gas heating pipe is provided with a spiral guide vane, which extends spirally along the length of the flue gas heating pipe.

2. The combustion heating assembly according to claim 1, characterized in that, Two exhaust heating pipes are provided and are located on opposite sides of the furnace along the first direction. Each exhaust heating pipe includes at least two pipe units arranged along the first direction, and the at least two pipe units are connected in sequence to form a zigzag flow channel.

3. The combustion heating assembly according to claim 2, characterized in that, The combustion heating assembly also includes: Two first connecting boxes are connected to the furnace chamber, and the inner cavity of the first connecting boxes is connected to the inner cavity of the furnace chamber. Two pipe units adjacent to the furnace chamber are respectively connected to the two first connecting boxes. At least two second connecting boxes, with one end of two adjacent pipe units connected to the same second connecting box; Two third connecting boxes, the outermost pipe unit is connected to the end of the third connecting box, and the third connecting box is provided with an exhaust pipe.

4. The combustion heating assembly according to claim 3, characterized in that, Each of the pipe units includes a plurality of parallel first pipes. In the same pipe unit, the same end of the plurality of first pipes is connected to the same first connecting box, the same second connecting box, or the same third connecting box.

5. The combustion heating assembly according to claim 4, characterized in that, All of the first tubes are equipped with the aforementioned spiral guide vanes; and / or Two first connecting boxes are respectively connected to opposite ends of the furnace along a second direction, the second direction being perpendicular to the first direction. The first connecting boxes extend along the first direction to form an extension protruding from the furnace. A plurality of first pipes of the pipe unit adjacent to the furnace are connected to the extension.

6. The combustion heating assembly according to claim 1, characterized in that, The furnace chamber includes: Combustion chamber, wherein the burner is disposed within the combustion chamber; The gas collection chamber is connected to the combustion chamber, and the exhaust heating pipe is connected to the gas collection chamber.

7. The combustion heating assembly according to claim 1, characterized in that, The combustion heating assembly also includes: The preheating box is equipped with an inlet pipe and an outlet pipe, the outlet pipe being used to connect to the boiler drum; A preheating pipe is located inside the preheating box and is connected to the exhaust heating pipe.

8. The combustion heating assembly according to claim 7, characterized in that, The preheating pipe includes a plurality of parallel second pipes, and the combustion heating assembly further includes: Two fourth connecting boxes are connected to the preheating box. One of the fourth connecting boxes is connected to the flue gas heating pipe, and the other fourth connecting box is provided with an exhaust pipe for connecting to a fan. The two ends of the second pipe are respectively connected to the two fourth connecting boxes.

9. A boiler, characterized in that, include: Boiler tube; The combustion heating assembly as described in any one of claims 1 to 8, wherein the exhaust heating pipe is located inside the boiler drum.

10. The boiler according to claim 9, characterized in that, The boiler also includes a water removal assembly, which comprises: A dewatering section is located at the top of the boiler drum. The dewatering section forms a dewatering chamber, and the top of the dewatering section is provided with a steam discharge hole that communicates with the dewatering chamber. A steam inlet pipe is connected to the dewatering section and communicates with the dewatering chamber; A steam discharge pipe is connected to the steam discharge hole.

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