Economizer for marine double-h finned tube bank

Abstract

The utility model belongs to the ship main engine waste heat recovery technical field relates to a kind of marine double H type fin heat exchange tube group's waste heat economizer, including box, box is sequentially provided with the intercommunication inlet, lower smoke box, heat exchange tube group, upper smoke box and smoke outlet from bottom to top;The heat exchange tube group includes two several fixed baffle, and several heat exchange tubes are arranged on the fixed baffle S type, and the same double H type fin is fixedly connected on the two adjacent heat exchange tubes, and the both ends of each heat exchange tube are respectively communicated with upper header and lower header.The utility model structure is compact, rigid, and has less dust, strong wear resistance, high heat exchange efficiency, the traditional light pipe is improved into double H type fin heat exchange tube group structure, the heating surface of double H type fin is 7-8 times of light pipe, and double H type fin heat exchange tube group is arranged in line with flue gas pipeline, which greatly reduces the dust.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat recovery technology of marine main engine exhaust gas, and relates to a waste heat economizer for marine double H-type finned heat exchange tube assembly. Background Technology

[0002] During ship operation, the exhaust gas from the main engine is hot and plentiful, generating a large amount of waste heat. This waste heat is usually recovered using a waste heat economizer to improve the ship's energy efficiency, reduce operating costs, and also reduce thermal pollution to the environment.

[0003] A Chinese invention patent application with publication number CN105841530A discloses a marine heat pipe type waste heat economizer, comprising: a heat pipe, with a ribbed heat pipe bundle arranged around the outside of the heat pipe; a flue gas bypass cavity disposed at one end of the heat pipe, the inside of the flue gas bypass cavity being constructed with a sound-absorbing material; and a flue gas baffle valve disposed at the flue gas inlet for detecting the outlet water temperature of the waste heat economizer.

[0004] The existing technology has the following technical defects:

[0005] Traditional waste heat economizers mainly use flue tubes or bare tubes and water tubes, which have low heat exchange efficiency, large size, and large footprint on ships. Furthermore, when flue gas enters the heat exchange tube assembly, impurities and dust in the flue gas easily adhere to the heat exchange tubes, thus affecting the heat exchange efficiency of the heat exchange tubes. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a waste heat economizer for marine double H-type finned heat exchange tube assembly.

[0007] The waste heat economizer for marine double H-type finned heat exchange tube assembly described in this utility model includes a housing, which is provided with a connected smoke inlet, a lower smoke box, a heat exchange tube assembly, an upper smoke box and a smoke outlet from bottom to top.

[0008] The heat exchange tube assembly includes two fixed baffles, on which several heat exchange tubes are arranged in an S-shape. The same double H-shaped fin is fixedly connected to two adjacent heat exchange tubes, and each heat exchange tube is connected to an upper header and a lower header at both ends.

[0009] The heat exchange tubes on the heat exchange tube assembly are bent and arranged with soot blowing ports. The housing is equipped with soot blowing baffles corresponding to the soot blowing ports. Since the flue gas passes through the heat exchange tube assembly from bottom to top, the dust in the flue gas is easy to adhere to the heat exchange tubes and fins, thereby affecting the heat exchange efficiency. High-pressure gas is introduced through the soot blowing ports to blow air and remove ash from the heat exchange tube assembly, thus ensuring the heat exchange efficiency.

[0010] The soot blowing port is provided with four ports, and the soot blowing baffle corresponds to each soot blowing port. By setting multiple soot blowing ports, the heat exchange tube group can be soot blown from multiple directions.

[0011] The two heat exchange tubes connected by the double H-shaped fins are arranged in parallel, and the distance between the two heat exchange tubes is 70-80mm.

[0012] The two heat exchange tubes are uniformly provided with several double H-shaped fins. The distance between two adjacent double H-shaped fins is 8-25mm. The design spacing of the fins is reasonably selected based on the flue gas composition and flue gas resistance of the main unit.

[0013] The double H-shaped fins and heat exchange tubes are welded together. The connection between the double H-shaped fins and heat exchange tubes adopts a unique sawtooth structure, which avoids weld cracking while having a good heat transfer coefficient.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This utility model has a compact structure, good rigidity, less dust accumulation, strong wear resistance, and high heat exchange efficiency. It improves the traditional bare tube into a double H-shaped finned heat exchange tube assembly structure. The heat-receiving surface of the double H-shaped fins is 7-8 times that of the bare tube. The double H-shaped finned heat exchange tube assembly is arranged in parallel with the flue gas duct, which greatly reduces dust accumulation. Attached Figure Description

[0016] Figure 1 This is a front view of an embodiment of the present invention.

[0017] Figure 2 This is a left view of an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the internal structure of an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the heat exchange tube assembly in one embodiment of the present invention.

[0020] Figure 5 This is a front view of a heat exchange tube assembly according to one embodiment of the present invention.

[0021] Figure 6 This is a left view of a heat exchange tube assembly in one embodiment of this utility model.

[0022] Figure 7 This is a schematic diagram of the structure of the double H-shaped fins in one embodiment of the present invention.

[0023] In the diagram: 1. Box body; 2. Lower smoke box; 3. Smoke inlet; 4. Soot blowing port; 5. Fixed baffle; 6. Upper smoke box; 7. Smoke outlet; 8. Heat exchange tube assembly; 9. Upper header; 10. Lower header; 11. Heat exchange tube; 12. Double H-shaped fins. Detailed Implementation

[0024] Example 1

[0025] like Figures 1-6 As shown, the waste heat economizer of the marine double H-shaped finned heat exchanger tube assembly 8 of this utility model includes a housing 1. The housing 1 is provided with a flue gas inlet 3, a lower flue gas box 2, a heat exchanger tube assembly 8, an upper flue gas box 6, and a flue gas outlet 7, which are connected from bottom to top. The heat exchanger tube assembly 8 includes two fixed baffles 5. Several heat exchanger tubes 11 are arranged in an S-shape on the fixed baffles 5. The same double H-shaped finned heat exchanger 12 is fixedly connected to two adjacent heat exchanger tubes 11. The two ends of each heat exchanger tube 11 are respectively connected to an upper header 9 and a lower header 10. The heat exchanger tubes 11 on the heat exchanger tube assembly 8 are bent and arranged to form soot blowing ports 4. The housing 1 is provided with soot blowing baffles corresponding to the soot blowing ports 4. Since the flue gas passes through the heat exchanger tube assembly 8 from bottom to top, the dust in the flue gas is easy to adhere to the heat exchanger tubes 11 and fins, thereby affecting the heat exchange efficiency. Soot blowing is introduced through the soot blowing ports 4. High-pressure gas is used to blow ash off the heat exchange tube assembly 8, ensuring heat exchange efficiency. Four ash-blowing ports 4 are provided, with each port corresponding to a ash-blowing baffle. Multiple ash-blowing ports 4 allow for multi-directional ash blowing of the heat exchange tube assembly 8. The two heat exchange tubes 11 connected by the double H-shaped fins 12 are arranged in parallel, with a spacing of 70-80mm between them. Several double H-shaped fins 12 are evenly distributed on the two heat exchange tubes 11, with a spacing of 8-25mm between two adjacent double H-shaped fins 12. The fin spacing is rationally selected based on the flue gas composition and flue gas resistance of the main unit. The double H-shaped fins 12 are welded to the heat exchange tubes 11, and the connection between the double H-shaped fins 12 and the heat exchange tubes 11 uses a unique serrated structure to avoid weld cracking while maintaining a good heat transfer coefficient.

[0026] Working process or working principle:

[0027] During operation, the high-temperature flue gas from the main unit flows from the inlet 3 into the lower smoke box 2 and passes sequentially through the heat exchange tube assembly 8, the upper smoke box 6, and the outlet 7. When the heat exchange efficiency is low or during routine maintenance of the heat exchange tube assembly 8, the heat exchange tube assembly 8 is purged by blowing high-pressure gas into the blowing port 4 through the opening of the soot blowing baffle. This removes the dust adhering to the heat exchange tubes 11 and fins in the flue gas. The blown-off dust can be directly discharged from the outlet 7 along with the flue gas and high-pressure gas, thus ensuring the heat exchange efficiency.

[0028] Compared with the prior art, the beneficial effects of this utility model are:

[0029] This utility model has a compact structure, good rigidity, less dust accumulation, strong wear resistance, and high heat exchange efficiency. It improves the traditional bare tube into a double H-shaped fin 12 heat exchange tube group 8 structure. The heat receiving surface of the double H-shaped fin 12 is 7-8 times that of the bare tube. The double H-shaped fin 12 heat exchange tube group 8 is arranged in parallel with the flue gas duct, which greatly reduces dust accumulation.

[0030] The descriptions of the orientation and relative positional relationships of the structure in this utility model, such as descriptions of front, back, left, right, up, and down, do not constitute a limitation on this utility model, but are merely for the convenience of description.

Claims

1. A waste heat economizer for marine double H-type finned heat exchanger tube assemblies, characterized in that: It includes a housing (1), which is provided with a flue gas inlet (3), a lower flue gas box (2), a heat exchange tube assembly (8), an upper flue gas box (6) and a flue gas outlet (7) from bottom to top. The heat exchange tube assembly (8) includes two fixed baffles (5), and several heat exchange tubes (11) are arranged in an S-shape on the fixed baffles (5). The same double H-shaped fin (12) is fixedly connected to two adjacent heat exchange tubes (11). The two ends of each heat exchange tube (11) are respectively connected to the upper header (9) and the lower header (10).

2. The waste heat economizer for marine double H-type finned heat exchanger tube assembly according to claim 1, characterized in that: The heat exchange tubes (11) on the heat exchange tube assembly (8) are bent and arranged to form soot blowing ports (4), and the box body (1) is provided with soot blowing baffles (13) corresponding to the soot blowing ports (4).

3. The waste heat economizer for marine double H-type finned heat exchange tube assemblies according to claim 2, characterized in that: The soot blowing port (4) is provided in four parts, and the soot blowing baffle (13) corresponds to the soot blowing port (4) one by one.

4. The waste heat economizer for marine double H-type finned heat exchanger tube assembly according to claim 3, characterized in that: The two heat exchange tubes (11) connected by the double H-shaped fins (12) are arranged in parallel, and the distance between the two heat exchange tubes (11) is 70-80mm.

5. The waste heat economizer for marine double H-type finned heat exchanger tube assembly according to claim 4, characterized in that: The two heat exchange tubes (11) are uniformly provided with a number of double H-shaped fins (12), and the distance between two adjacent double H-shaped fins (12) is 8-25mm.

6. The waste heat economizer for marine double H-type finned heat exchange tube assemblies according to claim 5, characterized in that: The double H-shaped fins (12) and the heat exchange tube (11) are welded together.

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