A device suitable for waste heat recovery from boiler flue gas
By designing a waste heat recovery device for boiler flue gas, and utilizing the tumbling of the container and clean air to dry the materials, the problem of clumping or agglomeration during the drying process was solved, achieving uniform drying and environmentally friendly drying effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGXIA BAOFENG ENERGY GROUP CO LTD
- Filing Date
- 2025-09-12
- Publication Date
- 2026-07-31
AI Technical Summary
During the material drying process, clumping or agglomeration can easily occur, leading to uneven drying and affecting the quality of the material.
Design a device suitable for waste heat recovery from boiler flue gas. It utilizes a tumbling container and clean air drying to avoid direct contact between flue gas and materials. The material is tumbling by driving the container to swing back and forth, and the clean air is heated by the flue gas heating conveyor pipe for drying.
This achieves uniform drying of materials, avoids clumping or agglomeration, improves material quality, and reduces flue gas pollution.
Smart Images
Figure CN224580749U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of boiler waste heat recovery technology, and in particular to a device suitable for boiler flue gas waste heat recovery. Background Technology
[0002] Industrial boilers are common thermal equipment, generally used to heat water or steam for factory production. Recovering and utilizing waste heat from boiler flue gas is an important energy-saving measure. Since waste heat from flue gas accounts for a large proportion of the boiler's heat output, the rational and effective utilization of this resource plays a positive role in improving unit efficiency and reducing coal consumption.
[0003] Using waste heat from boiler flue gas to dry materials is an important way to utilize resources. This method can transfer the residual heat in the flue gas to the materials through a well-designed heat exchange system, achieving low-energy drying and making full use of resources.
[0004] However, some materials are prone to clumping or agglomeration when piled up during the drying process. This phenomenon leads to a fixed heating area and obstructed moisture evaporation path, resulting in an uneven phenomenon where the outer layer is dry and the inner layer is damp. This causes the material quality to deteriorate, such as loose structure, insufficient hardness, or decreased toughness. Utility Model Content
[0005] The purpose of this invention is to address the shortcomings of existing technologies where material accumulation during drying easily leads to agglomeration or clumping, and to propose a device suitable for recovering waste heat from boiler flue gas.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] Design a device suitable for boiler flue gas waste heat recovery, including an outer shell, inside which a container is rotatably installed. One end of the container is connected to the end of a motor, which is fixedly mounted on the outside of the outer shell via a base. A feed pipe is fixedly installed on one side of the outer shell and a discharge pipe is fixedly installed on the other side. Gate mechanisms are fixedly installed at both ends of the container. A fan is fixedly installed at the bottom of the outer shell and an exhaust pipe is fixedly installed at the top. A flue gas conveying pipe is also fixedly installed at the bottom of the outer shell.
[0008] Preferably, a base plate is fixedly installed on the inner side of the outer shell, and side plates are fixedly installed on both sides of the base plate. A flow cavity is formed in the side wall of the outer shell, and the bottom opening of the flow cavity is located below the side plate.
[0009] Preferably, the side plate is inclined downward on the side closest to the bottom plate.
[0010] Preferably, the gate mechanism includes a limiting frame, which is fixedly installed on the outside of the container cylinder. A gate plate is slidably provided inside the limiting frame, and an electric telescopic rod is fixedly connected to one of the upper sides of the gate plate. The upper end of the electric telescopic rod is fixedly connected to the outer wall of the container cylinder.
[0011] Preferably, flexible rings are fixedly installed on the inner end surfaces of both the feed pipe and the discharge pipe.
[0012] Preferably, an insulation board is fixedly installed inside the exhaust pipe, and the insulation board has through holes evenly distributed inside.
[0013] Preferably, a dustproof mesh plate is also fixedly installed inside the exhaust pipe.
[0014] Preferably, the flue gas conveying pipe is in an "S"-shaped spiral shape.
[0015] The present invention proposes a device for recovering waste heat from boiler flue gas, which has the following advantages: During operation, heated air flows through the container to dry the material inside. By driving the container to swing back and forth, the material inside can be repeatedly tumbled and scattered, allowing the hot air to fully contact the material for drying. The material is less likely to clump or agglomerate. The device uses flue gas to heat the conveying pipe, and then heats clean air through the conveying pipe. The clean air is used to heat the material, and the flue gas does not directly contact the material, thus avoiding pollution caused by direct emission of flue gas. Attached Figure Description
[0016] Figure 1 This is a cross-sectional view of a device for recovering waste heat from boiler flue gas, as proposed in this utility model.
[0017] Figure 2 This is a longitudinal sectional view of a device for recovering waste heat from boiler flue gas, as proposed in this utility model.
[0018] Figure 3 This is a cross-sectional view of the container in a device for recovering waste heat from boiler flue gas, as proposed in this utility model.
[0019] Figure 4 This is a side view of the container structure in a device for recovering waste heat from boiler flue gas proposed in this utility model.
[0020] Figure 5 This is a schematic diagram of the flue gas conveying pipe in a device for recovering waste heat from boiler flue gas proposed in this utility model.
[0021] In the diagram: 1. Outer shell; 2. Container cylinder; 3. Motor; 4. Flue gas conveying pipe; 5. Fan; 6. Feed pipe; 7. Discharge pipe; 81. Limiting frame; 82. Gate plate; 83. Electric telescopic rod; 9. Flexible ring; 10. Base plate; 11. Side plate; 12. Flow chamber; 13. Exhaust pipe; 14. Insulation board; 15. Dustproof mesh plate. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0023] Example 1: Refer to Figure 1-5 A device for recovering waste heat from boiler flue gas includes a housing 1, inside which a container 2 is rotatably mounted. The container 2 holds materials that need to be dried. One end of the container 2 is connected to the end of a motor 3, which is fixedly mounted on the outside of the housing 1 via a base. The motor 3 drives the container 2 to rotate, causing the materials inside to tumble and ensuring thorough drying. A feed pipe 6 is fixedly installed on one side of the housing 1, and a discharge pipe 7 is fixedly installed on the other side. Both ends of the container 2 have openings corresponding to the feed pipe 6 and the discharge pipe 7, respectively. (See attached diagram) Figure 1 As shown, the height of the feed pipe 6 is higher than the height of the discharge pipe 7. The material enters the container cylinder 2 through the feed pipe 6, and the dried material is discharged through the discharge pipe 7.
[0024] Both ends of the container cylinder 2 are fixedly equipped with gate mechanisms. The gate mechanisms include limit frames 81, which are fixedly installed on the outside of the container cylinder 2. A gate plate 82 is slidably disposed inside the limit frames 81, providing stable support for the gate plate 82. An electric telescopic rod 83 is fixedly connected to one side of the upper end of the gate plate 82. The upper end of the electric telescopic rod 83 is fixedly connected to the outer wall of the container cylinder 2. The electric telescopic rod 83 can drive the gate plate 82 to move up and down, and the gate plate 82 can block the through hole of the container cylinder 2.
[0025] The electric telescopic rod 83 requires an external power cord to control the power supply, so the rotation angle of the container 2 needs to be limited. In this embodiment, when the motor 3 drives the container 2 to rotate, the container 2 first rotates 120° clockwise, then rotates 240° counterclockwise, and then rotates 240° clockwise again. This back-and-forth swinging of the container 2 can both turn the material over and prevent the wiring connected to the electric telescopic rod 83 from disconnecting.
[0026] Flexible rings 9 are fixedly installed on the inner end surfaces of both the feed pipe 6 and the discharge pipe 7, located outside the gate plate 82. When the container cylinder 2 reciprocates, the openings at both ends of the container cylinder 2 are blocked by the gate plate 82, preventing material from falling out. When the gate plate 82 rotates with the container cylinder 2 to contact the flexible rings 9, the flexible rings 9 do not obstruct or damage the gate plate 82, thus providing protection. Furthermore, the stroke of the motor 3 can control the container cylinder 2 to maintain its position after stopping. Figure 1 The state shown makes the gates 82 at both ends of the container cylinder 2 correspond exactly to the flexible rings 9, which makes loading and unloading more convenient.
[0027] A fan 5 is fixedly installed at the bottom of the outer casing 1, and an exhaust pipe 13 is fixedly installed at the top. The fan 5 blows air upwards, and the exhaust pipe 13 discharges the air from the casing. A flue gas conveying pipe 4 is also fixedly installed at the bottom of the outer casing 1. The flue gas conveying pipe 4 is used to transport the flue gas discharged from the boiler. Due to the influence of the flue gas, the surface temperature of the flue gas conveying pipe 4 is relatively high. When the air passes through the flue gas conveying pipe 4, the internal temperature of the air increases. Since the flue gas conveying pipe 4 is S-shaped, it increases the contact area between the air and the flue gas conveying pipe 4, improving the heating effect. The heated air flows upwards through the container 2. The sides of the container 2 are mesh-like, and the air can dry the material inside the container. In addition, the flue gas transported by the flue gas conveying pipe 4 is sent to an external specialized flue gas treatment device. After treatment by the external specialized treatment device, the flue gas is discharged, which is less likely to pollute the environment.
[0028] Working Principle: This device for recovering waste heat from boiler flue gas operates by first opening the gate 82 corresponding to the feed pipe 6, allowing material to be fed into the container 2 through the feed pipe 6. Then, the gate 82 corresponding to the feed pipe 6 is closed. Next, boiler flue gas is introduced into the flue gas conveying pipe 4 via external equipment. Simultaneously, the blower 5 and motor 3 are started. The air is heated as it passes through the flue gas conveying pipe 4. As the heated air flows upward through the container 2, it dries the material. At the same time, the motor 3 drives the container 2 to oscillate back and forth. During the oscillation, the container 2 dries the material inside. The material is repeatedly tumbled and scattered, allowing hot air to fully contact the material for drying. This prevents the material from clumping or agglomerating. The material evaporates moisture during the drying process, and the circulating air carries the moisture away in time, which is discharged through the exhaust pipe 13, thus achieving timely dehumidification. This device uses flue gas to heat the conveying pipe, which in turn heats the air, and then uses the air to heat the material. The flue gas does not directly contact the material, which avoids both flue gas contamination of the material and direct emission of flue gas causing pollution.
[0029] Example 2: In Example 1, because the air delivered by fan 5 flows directly upwards, the flow rate is not only fast but also the airflow direction is relatively uniform, which may lead to uneven drying. Therefore, this example is proposed. (Refer to...) Figure 1-2 In another preferred embodiment of this utility model, based on embodiment 1, a base plate 10 is fixedly installed on the inner side of the outer shell 1, and side plates 11 are fixedly installed on both sides of the base plate 10. The side plate 11 is inclined downward on the side closer to the base plate 10. A flow cavity 12 is opened in the side wall of the outer shell 1. The bottom opening of the flow cavity 12 is located below the side plate 11. After the air blown out by the fan 5 passes through the flue gas conveying pipe 4, part of the air will flow upward through the internal through hole of the base plate 10, and part of the air will be sent into the flow cavity 12 through the side plate 11. The upper opening of the flow cavity 12 faces the two sides of the container cylinder 2, which allows the hot air to be blown to the two sides of the container cylinder 2. The hot air can be blown to the container cylinder 2 from different directions, making the drying more uniform. It can also reduce the flow speed of the hot air and prolong the contact time between the hot air and the material, so as to make full use of resources.
[0030] Example 3: In Example 1, the exhaust duct 13 was not obstructed, resulting in a high exhaust velocity that carried away a significant amount of heat from the casing. Therefore, this example is proposed. (Refer to...) Figure 1-2 In another preferred embodiment of this utility model, based on Embodiment 1 or Embodiment 2, an insulation board 14 is fixedly installed inside the exhaust pipe 13. The insulation board 14 has evenly spaced through holes and is made of polyurethane foam, providing excellent insulation performance. When hot air is exhausted upwards through the through holes in the insulation board 14, some heat can be blocked from escaping. A dustproof mesh 15 is also fixedly installed inside the exhaust pipe 13, serving a protective function to prevent dust from the outside air from entering the casing.
[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A device for recovering waste heat from boiler flue gas, comprising a housing (1), characterized in that, The outer shell (1) is rotatably equipped with a container (2). One end of the container (2) is connected to the end of the motor (3). The motor (3) is fixedly installed on the outside of the outer shell (1) via a base. A feed pipe (6) is fixedly installed on one side of the outer shell (1) and a discharge pipe (7) is fixedly installed on the other side. Gate mechanisms are fixedly installed at both ends of the container (2). A fan (5) is fixedly installed at the bottom of the outer shell (1) and an exhaust pipe (13) is fixedly installed at the top. A flue gas conveying pipe (4) is also fixedly installed at the bottom of the outer shell (1).
2. The device for recovering waste heat from boiler flue gas according to claim 1, characterized in that, A base plate (10) is fixedly installed on the inner side of the outer shell (1), and side plates (11) are fixedly installed on both sides of the base plate (10). A flow cavity (12) is opened in the side wall of the outer shell (1), and the bottom opening of the flow cavity (12) is located below the side plate (11).
3. The device for boiler flue gas waste heat recovery according to claim 2, characterized in that, The side plate (11) is inclined downward on the side closest to the bottom plate (10).
4. The device for boiler flue gas waste heat recovery according to claim 1, characterized in that, The gate mechanism includes a limiting frame (81), which is fixedly installed on the outside of the container (2). A gate plate (82) is slidably provided inside the limiting frame (81). An electric telescopic rod (83) is fixedly connected to one side of the upper end of the gate plate (82). The upper end of the electric telescopic rod (83) is fixedly connected to the outer wall of the container (2).
5. The device for boiler flue gas waste heat recovery according to claim 4, characterized in that, Flexible rings (9) are fixedly installed on the inner end surfaces of both the feed pipe (6) and the discharge pipe (7).
6. The device for boiler flue gas waste heat recovery according to claim 1, characterized in that, An insulation board (14) is fixedly installed inside the exhaust pipe (13), and the insulation board (14) has through holes evenly distributed inside.
7. The device for boiler flue gas waste heat recovery according to claim 6, characterized in that, The exhaust pipe (13) is also fixedly installed with a dustproof mesh plate (15).
8. The device for recovering waste heat from boiler flue gas according to claim 1, characterized in that, The flue gas conveying pipe (4) is in an "S" shaped spiral shape.