Natural gas boiler waste heat utilization device

Abstract

The utility model discloses a natural gas boiler waste heat utilization device, which belongs to the field of waste heat utilization devices, and comprises a flue box and an arranged filtering mechanism, a filter screen on the bottom surface of a pressing plate is inserted into a smoke inlet through a mounting opening, the mounting opening is sealed through a sealing frame, a screw rod is rotated through a knob after a turnover plate is turned over, and the filter screen is arranged on the bottom surface of the pressing plate. The screw rod drives the L-shaped plate to move upwards through the rotating block, and the L-shaped plate moves along the guide hole in the overturning plate through the guide rod until the vertical part of the L-shaped plate is inserted into the fixing frames arranged on the two sides of the smoke inlet, so that the filter screen can be fixedly mounted in the smoke inlet for use, and the filter screen can be conveniently dismounted and cleaned subsequently; when smoke in the natural gas boiler is exhausted into the flue box from the smoke inlet through the smoke exhaust pipe of the natural gas boiler, dust impurities in the smoke can be effectively intercepted and filtered through the filter screen, and then the purpose of improving the utilization rate of smoke waste heat of the natural gas boiler is achieved.

Description

Technical Field

[0001] This utility model relates to the field of waste heat utilization devices, and in particular to a waste heat utilization device for a natural gas boiler. Background Technology

[0002] A natural gas boiler is a thermal energy device that uses natural gas as its main fuel. It generates heat through combustion, which in turn heats water into steam or high-temperature water for various production and civil applications.

[0003] In existing technologies, the utilization of waste heat from natural gas boilers is necessary because natural gas boilers produce a large amount of flue gas during combustion, which contains abundant sensible heat and latent heat of vapor, resulting in a considerable thermal energy content. However, in traditional boiler operation, this waste heat is often not fully utilized and is directly emitted into the atmosphere, leading to energy waste and potential environmental pollution. By employing waste heat recovery technologies, such as installing flue gas condensers and heat pipe heat exchangers, this heat can be recovered and reused for preheating boiler feedwater, heating domestic hot water, or providing heating, thereby significantly improving energy efficiency, reducing energy consumption costs, and minimizing environmental pollution. Therefore, utilizing waste heat from natural gas boilers has significant economic and environmental implications.

[0004] However, in existing methods of utilizing the heat from the flue gas emitted by natural gas boilers through heat pipe waste heat recovery devices, the flue gas discharged from the natural gas boiler exhaust pipes directly enters the flue through the flue inlet. Since the flue gas contains a large amount of dust and impurities, after prolonged use, dust easily adheres to the heat pipes in the flue. This dust accumulation increases the thermal resistance of the heat pipe's heating surface, reduces the heat transfer performance and heat recovery efficiency of the heat pipe, and prevents the heat in the flue gas from being fully recovered and utilized, thereby reducing the utilization rate of waste heat from the natural gas boiler flue gas. Utility Model Content

[0005] The main objective of this invention is to provide a waste heat utilization device for natural gas boilers, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A waste heat utilization device for a natural gas boiler includes a flue box. The flue box has a flue inlet and a flue outlet on its left and right sides, respectively. The flue inlet is fixedly connected to the natural gas boiler's flue pipe. A water tank is fixedly connected to the top surface of the flue box, and the water tank has an outlet and an inlet on its left and right sides, respectively. Several heat pipes are fixedly connected inside the flue box, with the heat-conducting ends of the heat pipes located inside the water tank. A filtration mechanism is provided inside the flue inlet, comprising a pressure plate, a filter screen, a tilting plate, an L-shaped plate, and a screw. The filter screen is fixedly connected to the bottom surface of the pressure plate. The tilting plate is movably connected to symmetrically fixed blocks on both sides of the pressure plate via rotating rods on both sides. The L-shaped plate is movably connected to the tilting plate via a guide rod on its top surface, and the screw is movably connected to a screw hole on the top surface of the tilting plate. The screw is also movably connected to the L-shaped plate via a rotating block at its bottom end.

[0008] As a further improvement to the above solution, an installation opening is provided on the top surface of the smoke inlet, and a fixing frame is fixedly installed on each of the two side walls of the smoke inlet.

[0009] As a further improvement to the above solution, a filter screen is fixedly installed on the bottom surface of the pressure plate, and the filter screen passes through the installation port. A sealing frame is also fitted on the bottom surface of the pressure plate and at the top of the filter screen. Fixing blocks are fixedly installed on the two side walls of the pressure plate, and rotation holes are opened on the side walls of the fixing blocks.

[0010] As a further improvement to the above solution, rotating rods are fixedly installed on both sides of the flip plate, and the rotating rods are movably installed in the rotating holes. Screw holes and guide holes are also provided on the top surface of the flip plate.

[0011] As a further improvement to the above solution, the screw is threadedly connected to the screw hole, and a rotating block is fixedly installed at the bottom end of the screw, while a knob is fixedly installed at the top end of the screw.

[0012] As a further improvement to the above solution, a guide rod is fixedly installed on the top surface of the transverse part of the L-shaped plate, and the guide rod is inserted into the guide hole. A groove is also provided on the top surface of the transverse part of the L-shaped plate, and a rotating block is movably installed in the groove.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In this invention, the filter mechanism inserts the filter screen from the bottom of the pressure plate into the flue gas inlet through the mounting port, and seals the mounting port with a sealing frame. After flipping the flip plate, the screw is rotated by a knob, causing the screw to move the L-shaped plate upwards via a rotating block. The L-shaped plate moves along the guide holes on the flip plate via a guide rod until the vertical part of the L-shaped plate is inserted into the fixing frames on both sides of the flue gas inlet. This allows the filter screen to be installed and fixed in the flue gas inlet for use, and also facilitates subsequent disassembly and cleaning of the filter screen. When the flue gas in the natural gas boiler is discharged into the flue gas box through the natural gas boiler exhaust pipe from the flue gas inlet, it can pass through the filter screen... It effectively intercepts and filters dust and impurities in flue gas, preventing dust from easily adhering to the heat pipes inside the flue. Dust accumulation increases the thermal resistance of the heat pipe's heating surface, reducing its heat transfer performance and heat recovery efficiency, thus preventing the full recovery and utilization of heat from the flue gas. This improves the utilization rate of waste heat from the natural gas boiler's flue gas. After filtration, the flue gas enters the flue box and absorbs heat through several heat pipes. The absorbed heat is then transferred to the water in the water tank through another end, heating the water and thus utilizing the waste heat from the natural gas boiler. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a cross-sectional schematic diagram of the flue box and water tank of this utility model;

[0017] Figure 3 This is a schematic diagram of the overall structure of the smoke inlet of this utility model;

[0018] Figure 4 This is a structurally exploded diagram of the filtration mechanism of this utility model.

[0019] Figure 5 For the present utility model Figure 4 An enlarged schematic diagram of the structure at point A.

[0020] In the diagram: 1. Flue box; 2. Flue inlet; 3. Flue outlet; 4. Water tank; 5. Water inlet; 6. Water outlet; 7. Heat pipe; 8. Natural gas boiler flue pipe; 9. Filter mechanism; 10. Mounting port; 11. Fixing frame; 12. Pressure plate; 13. Filter screen; 14. Sealing frame; 15. Fixing block; 16. Rotating hole; 17. Flip plate; 18. Rotating rod; 19. Screw hole; 20. Guide hole; 21. Screw; 22. Rotating block; 23. Knob; 24. L-shaped plate; 25. Groove; 26. Guide rod. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be understood that the terms "upper", "middle", "outer", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] like Figure 1 - Figure 5 As shown, a waste heat utilization device for a natural gas boiler includes a flue box 1. The flue box 1 has a flue inlet 2 and a flue outlet 3 on its left and right sides, respectively. The flue inlet 2 is fixedly connected to the natural gas boiler flue pipe 8. A water tank 4 is also fixedly connected to the top surface of the flue box 1. The water tank 4 has an outlet 6 and a water inlet 5 on its left and right sides, respectively. Several heat pipes 7 are also fixedly connected inside the flue box 1. The heat-conducting end of the heat pipes 7 is located inside the water tank 4.

[0024] The specific principle by which this heat pipe waste heat recovery unit utilizes the heat in the flue gas discharged from the natural gas boiler is as follows:

[0025] After the natural gas boiler discharges high-temperature flue gas from the inlet 2 into the flue box 1 through the natural gas boiler exhaust pipe 8, several heat pipes 7 installed in the flue box 1 will absorb the heat in the flue gas. The absorbed heat will be discharged through one end located in the water tank 4. The discharged heat will heat the water added to the water tank 4 through the water inlet 5. The heated water can be discharged through the water outlet 6 for use, thereby achieving the purpose of utilizing the waste heat of the natural gas boiler.

[0026] The flue gas inlet 2 is equipped with a filter mechanism 9, which includes a pressure plate 12, a filter screen 13, a flip plate 17, an L-shaped plate 24, and a screw 21. The filter screen 13 is fixedly connected to the bottom surface of the pressure plate 12, and the flip plate 17 is movably connected to the symmetrical fixing blocks 15 on both sides of the pressure plate 12 through rotating rods 18 on both sides. The L-shaped plate 24 is movably connected to the flip plate 17 through a guide rod 26 on the top surface, and the screw 21 is movably connected to the screw hole 19 on the top surface of the flip plate 17. The screw 21 is also movably connected to the L-shaped plate 24 through a rotating block 22 at the bottom end. The filter mechanism 9 is used to filter dust and impurities in the flue gas to prevent dust from adhering to the heat pipe 7 and affecting the heat absorption efficiency, thereby improving the utilization rate of waste heat from the natural gas boiler.

[0027] like Figure 3 As shown, the top surface of the smoke inlet 2 is provided with an installation port 10, which is used to cooperate with the installation of the filter screen 13. Fixing frames 11 are fixedly installed on both sides of the smoke inlet 2, which are used to cooperate with the L-shaped plate 24 to install and fix the pressure plate 12.

[0028] like Figure 4 and Figure 5 As shown, a filter screen 13 is fixedly installed on the bottom surface of the pressure plate 12, and the filter screen 13 passes through the installation port 10. After the filter screen 13 is inserted into the flue gas inlet 2 through the installation port 10, when the flue gas enters the flue box 1 through the flue gas inlet 2, the filter screen 13 can intercept and filter the dust and impurities in the flue gas, preventing dust from entering the flue box 1. This avoids the problem that dust can easily adhere to the heat pipe 7 in the flue, and the accumulation of dust will increase the thermal resistance of the heat pipe 7 heating surface, reduce the heat transfer performance and heat recovery efficiency of the heat pipe 7, and prevent the heat in the flue gas from being fully recovered and utilized. A sealing frame 14 is also fitted on the bottom surface of the pressure plate 12 and the top of the filter screen 13. The sealing frame 14 can seal the installation port 10 to prevent air leakage. Fixing blocks 15 are fixedly installed on the two side walls of the pressure plate 12, and rotating holes 16 are opened on the side walls of the fixing blocks 15. The rotating holes 16 on the side walls of the fixing blocks 15 are used to cooperate with the rotating rod 18 to realize the rotation operation.

[0029] like Figure 4 and Figure 5 As shown, rotating rods 18 are fixedly installed on both sides of the flip plate 17, and the rotating rods 18 are movably installed in the rotating holes 16. The flip plate 17 can be flipped through the rotating rods 18 on both sides. The top surface of the flip plate 17 is also provided with screw holes 19 and guide holes 20. The screw holes 19 are used to cooperate with the screw 21 to realize the screw rotation operation, and the guide holes 20 are used to cooperate with the guide rod 26 to guide the L-shaped plate 24 to move.

[0030] like Figure 4 and Figure 5 As shown, the screw 21 is threadedly connected to the screw hole 19, and a rotating block 22 is fixedly installed at the bottom end of the screw 21. A knob 23 is fixedly installed at the top end of the screw 21. The screw 21 can be rotated in the screw hole 19 to achieve threaded rotation and movement, and the screw 21 will drive the rotating block 22 at the bottom end to rotate and move synchronously.

[0031] like Figure 4 and Figure 5As shown, a guide rod 26 is fixedly installed on the top surface of the horizontal part of the L-shaped plate 24, and the guide rod 26 is inserted into the guide hole 20. A groove 25 is also provided on the top surface of the horizontal part of the L-shaped plate 24, and a rotating block 22 is movably installed in the groove 25. Driven by the rotating block 22 in the groove 25, the L-shaped plate 24 will move upward, and the guide rod 26 will move in the guide hole 20 until the vertical part of the L-shaped plate 24 is inserted into the frame of the fixed frame 11. Thus, the pressure plate 12 can be fixed on the top surface of the smoke inlet 2, and the filter screen 13 can be installed and fixed in the smoke inlet 2 for use. At the same time, it is also convenient to disassemble and clean the filter screen 13 later to ensure the filtration effect of the filter screen 13 on dust and impurities in the flue gas.

[0032] When this heat pipe waste heat recovery unit utilizes the heat in the flue gas discharged from the natural gas boiler, its specific operating principle, in conjunction with the filter mechanism 9, is as follows:

[0033] After the flue gas inlet 2 is connected to the natural gas boiler exhaust pipe 8 on the natural gas boiler, the filter screen 13 installed on the bottom surface of the pressure plate 12 is inserted into the inside of the flue gas inlet 2 through the installation port 10 opened on the top surface of the flue gas inlet 2. Then, the flip plates 17 located on both sides of the pressure plate 12 are flipped inwards. The rotating rods 18 installed on the side walls of the flip plates 17 will rotate in the rotating holes 16 opened on the side walls of the symmetrical fixing blocks 15 installed on the corresponding side of the pressure plate 12 until the flip plates 17 can no longer be flipped. Then, the knob 23 located above the flip plates 17 is manually turned. The knob 23 will drive the screw 21 to achieve threaded rotation in the screw hole 19 opened on the top surface of the flip plates 17. The screw 21 will also drive the rotating block 22 installed at the bottom to rotate in the groove 2 opened on the top surface of the horizontal part of the L-shaped plate 24. 5. After rotating the knob 23 continuously, the screw 21 will drive the L-shaped plate 24 upward through the rotating block 22. During the movement, the guide rod 26 installed on the top surface of the horizontal part of the L-shaped plate 24 will move along the guide hole 20 opened on the top surface of the flip plate 17 until the vertical part of the L-shaped plate 24 is inserted into the frame of the fixing frame 11 installed on both sides of the smoke inlet 2, and the knob 23 can no longer be rotated. Then the pressure plate 12 can be fixed on the top surface of the smoke inlet 2. The pressure plate 12, together with the sealing frame 14 fitted on the top of the bottom filter screen 13, will seal the installation port 10 by pressing the sealing frame 14 tightly against the top surface of the smoke inlet 2 with the reverse force generated by the pressure plate 12 during installation, thus preventing the smoke from leaving the filter mechanism 9. A gas leak occurred. When the flue gas from the natural gas boiler is discharged into the flue box 1 through the flue gas boiler exhaust pipe 8 from the inlet 2, the heat pipe 7 absorbs and conducts heat from the flue gas. Meanwhile, when the cold water in the water tank 4 is heated to utilize the residual heat in the flue gas, the filter screen 13 installed in the inlet 2 can intercept and filter dust and impurities in the flue gas. This prevents dust from easily adhering to the heat pipe 7 in the flue. Dust accumulation increases the thermal resistance of the heat pipe 7's heating surface, reducing its heat transfer performance and heat recovery efficiency, thus preventing the full recovery and utilization of heat from the flue gas. To address the issue of waste heat recovery, the heat pipe waste heat recovery unit aims to improve the utilization rate of waste heat from natural gas boiler flue gas. Finally, to ensure the filtration effect of filter screen 13 on dust and impurities in flue gas, filter screen 13 can be periodically removed from the flue gas inlet 2 for cleaning. When removing it, rotate knob 23 in the opposite direction. Screw 21 will push L-shaped plate 24 through rotating block 22, so that the vertical part of L-shaped plate 24 is moved out of fixed frame 11. Then, flip flip plate 17 outward and move pressure plate 12 upward from the top surface of flue gas inlet 2, so that filter screen 13 can be removed from flue gas inlet 2 through installation port 10.

[0034] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A waste heat utilization device for a natural gas boiler, comprising a flue box (1), wherein the left and right sides of the flue box (1) are respectively provided with a flue inlet (2) and a flue outlet (3), and the flue inlet (2) is fixedly connected to the flue pipe (8) of the natural gas boiler; a water tank (4) is also fixedly connected to the top surface of the flue box (1), and the left and right sides of the water tank (4) are respectively provided with a water outlet (6) and a water inlet (5); a plurality of heat pipes (7) are also fixedly connected inside the flue box (1), and the heat-conducting ends of the heat pipes (7) are located inside the water tank (4), characterized in that: The smoke inlet (2) is equipped with a filter mechanism (9), which includes a pressure plate (12), a filter screen (13), a flip plate (17), an L-shaped plate (24), and a screw (21). The filter screen (13) is fixedly connected to the bottom surface of the pressure plate (12), and the flip plate (17) is movably connected to the symmetrical fixing blocks (15) on both sides of the pressure plate (12) through the rotating rods (18) on both sides. The L-shaped plate (24) is movably connected to the flip plate (17) through the guide rod (26) on the top surface, and the screw (21) is movably connected in the screw hole (19) on the top surface of the flip plate (17). The screw (21) is also movably connected to the L-shaped plate (24) through the rotating block (22) at the bottom end.

2. The waste heat utilization device for a natural gas boiler according to claim 1, characterized in that: The top surface of the smoke inlet (2) is provided with an installation opening (10), and a fixing frame (11) is fixedly installed on both sides of the smoke inlet (2).

3. The waste heat utilization device for a natural gas boiler according to claim 2, characterized in that: A filter screen (13) is fixedly installed on the bottom surface of the pressure plate (12), and the filter screen (13) passes through the installation port (10). A sealing frame (14) is also fitted on the bottom surface of the pressure plate (12) and at the top of the filter screen (13). Fixing blocks (15) are fixedly installed on the two side walls of the pressure plate (12), and a rotating hole (16) is opened on the side wall of the fixing block (15).

4. A waste heat recovery device for a natural gas boiler according to claim 3, characterized in that: Rotating rods (18) are fixedly installed on both sides of the flip plate (17), and the rotating rods (18) are movably installed in the rotating hole (16). The top surface of the flip plate (17) is also provided with screw holes (19) and guide holes (20).

5. A waste heat recovery device for a natural gas boiler according to claim 4, characterized in that: The screw (21) is threadedly connected to the screw hole (19), and a rotating block (22) is fixedly installed at the bottom end of the screw (21), and a knob (23) is fixedly installed at the top end of the screw (21).

6. A waste heat recovery device for a natural gas boiler according to claim 5, characterized in that: A guide rod (26) is fixedly installed on the top surface of the horizontal part of the L-shaped plate (24), and the guide rod (26) is inserted into the guide hole (20). A groove (25) is also provided on the top surface of the horizontal part of the L-shaped plate (24), and a rotating block (22) is movably installed in the groove (25).

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