Marine waste heat economizer exhaust gas conditioning device
By using a baffle system with built-in main flue and bypass flue, the problems of dry burning of heat exchange tube groups and space occupation by external bypass flue are solved, achieving precise control of flue gas heat and space saving.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO KAINENG BOILER EQUIP
- Filing Date
- 2025-08-27
- Publication Date
- 2026-07-31
AI Technical Summary
Existing marine waste heat economizers are prone to dry burning of heat exchange tubes when heat load changes, and external bypass flue structures are difficult to install in the ship's engine room and occupy a lot of space.
Design a built-in main flue and bypass flue, and a baffle system connected by a main shaft and a secondary shaft. Use a drive component to achieve stepless adjustment of the flue gas ratio, avoid dry burning and eliminate the need for an external bypass flue structure.
It achieves precise control of flue gas heat, avoids dry burning of heat exchanger tubes, and saves ship engine room space and installation costs.
Smart Images
Figure CN224579375U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of energy-saving technology of marine power systems, and relates to a waste gas regulation device for marine waste heat economizers. Background Technology
[0002] During ship operation, the exhaust gas from the main engine (usually a large diesel engine) is characterized by high temperature (typically 200-450℃ or higher) and large flow rate, containing a large amount of recoverable waste heat. Marine waste heat economizers (or exhaust gas boilers) are key equipment for recovering this energy, with their core component being the heat exchange tube bundle. High-temperature flue gas flows through the heat exchange tube bundle, transferring heat to the cooling medium inside the tubes (such as water, thermal oil, organic working fluids, etc.). The heated medium is then supplied to heat users on board (such as fuel oil heating, domestic hot water, steam systems, absorption refrigeration, etc.). However, the ship's heat load demand is dynamic (e.g., changes in main engine load, start-up and shutdown of heat-using equipment). When the heat demand is lower than the heat that the waste heat economizer can provide, allowing all the high-temperature flue gas to pass through the heat exchange tube bundle will cause the medium inside the tubes to overheat or even vaporize and burn dry, severely damaging the economizer's lifespan and operational safety.
[0003] The existing technology has the following technical defects:
[0004] Current equipment typically consists of an economizer without a bypass flue, allowing all flue gas to pass through continuously. This usually only allows for short periods of dry burning, as prolonged use can severely damage the heat exchange tubes. Alternatively, an external bypass flue can be installed, with an additional parallel flue gas passage (bypass flue) outside the economizer body. When heat demand decreases, independent baffles (or valves) installed on the bypass flue and the main flue of the economizer work together to divert some or all of the flue gas to the bypass flue for direct discharge into the atmosphere. However, these systems are bulky, making them difficult to install in the extremely space-constrained engine room of ships, encroaching on the space of other equipment, and increasing the complexity of the piping. Utility Model Content
[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a waste gas regulation device for marine waste heat economizers.
[0006] The waste gas regulating device for marine waste heat economizers of this utility model includes a main body. The main body is provided with a main flue and a bypass flue. A main rotating shaft and a secondary rotating shaft are rotatably connected in the main flue and the bypass flue, respectively. A main flue baffle and a bypass flue baffle are fixedly connected to the main rotating shaft and the secondary rotating shaft, respectively. A drive assembly is provided on the main body through a support frame. The drive assembly is connected to the main rotating shaft and the secondary rotating shaft.
[0007] The main flue has two main rotating shafts rotatably connected to it, and the bypass flue has one auxiliary rotating shaft rotatably connected to it.
[0008] The main flue baffle and the bypass flue baffle are arranged at a 90° vertical angle.
[0009] The drive assembly includes a drive motor fixed to the main body, a first transmission plate connected to the drive motor via a transmission device, a first connecting rod hinged to the first transmission plate, a second transmission plate hinged to the first connecting rod and fixedly connected to one of the main rotating shafts, a second connecting rod hinged to the second transmission plate, a third connecting rod hinged to the second connecting rod and a third transmission plate fixedly connected to another main rotating shaft, and a fourth transmission plate hinged to the third connecting rod and fixedly connected to a secondary rotating shaft.
[0010] The main shaft and the auxiliary shaft pass through the main body and are rotatably connected to the main body via a rotating bracket.
[0011] The main rotating shaft is evenly provided with several main flue baffle supports, and the auxiliary rotating shaft is evenly provided with several bypass flue baffle supports.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] This invention can steplessly allocate the ratio of flue gas entering the heat exchanger tube assembly for heating and directly bypassing and exhausting it, thereby precisely controlling the heat transferred to the cooling medium, maintaining its outlet temperature at the set value, and completely avoiding dry burning of the heat exchanger tube assembly. It also eliminates the need for a large external bypass flue and its associated structures, significantly saving valuable space and installation costs in the ship's engine room. Attached Figure Description
[0014] Figure 1 This is a structural schematic diagram of an embodiment of the present invention.
[0015] Figure 2 This is a front view of an embodiment of the present invention.
[0016] Figure 3 This is a right view of an embodiment of the present invention.
[0017] Figure 4 This is a top view of an embodiment of the present invention.
[0018] Figure 5 This is a utility model Figure 4 Sectional view along direction AA.
[0019] In the diagram: 1. Main body; 2. Bypass flue; 3. Main flue; 4. Drive motor; 5. Bypass flue baffle; 6. Support frame; 7. First transmission plate; 8. First connecting rod; 9. Second transmission plate; 10. Second connecting rod; 11. Main rotating shaft; 12. Third transmission plate; 13. Third connecting rod; 14. Fourth transmission plate; 15. Secondary rotating shaft; 16. Rotating bracket; 17. Main flue baffle; 18. Main flue baffle bracket; 19. Bypass flue baffle bracket. Detailed Implementation
[0020] Example 1
[0021] like Figures 1-5 As shown, the marine waste heat economizer exhaust gas regulating device of this utility model includes a body 1. The body 1 contains a main flue 3 and a bypass flue 2. A main rotating shaft 11 and a secondary rotating shaft 15 are rotatably connected within the main flue 3 and bypass flue 2, respectively. A main flue baffle 17 and a bypass flue baffle 5 are fixedly connected to the main rotating shaft 11 and the secondary rotating shaft 15, respectively. A drive assembly is mounted on the body 1 via a support frame 6, and the drive assembly is connected to the main rotating shaft 11 and the secondary rotating shaft 15. Two main rotating shafts 11 are rotatably connected within the main flue 3, and one secondary rotating shaft 15 is rotatably connected within the bypass flue 2. The main flue baffle 17 and the bypass flue baffle 5 are arranged at a 90° vertical angle, and are rigidly connected by a mechanical linkage, thus enabling the two baffles to... The plates move synchronously in opposite directions; the driving assembly includes a drive motor 4 fixed on the body 1, the drive motor 4 is connected to a first transmission plate 7 through a transmission device, a first connecting rod 8 is hinged on the first transmission plate 7, a second transmission plate 9 is hinged on the first connecting rod 8 and fixedly connected to one of the main rotating shafts 11, a second connecting rod 10 is hinged on the second transmission plate 9, a third connecting rod 13 is hinged on the second connecting rod 10 and a third transmission plate 12 fixedly connected to another main rotating shaft 11, and a fourth transmission plate 14 is hinged on the third connecting rod 13 and fixedly connected to the auxiliary rotating shaft 15; the main rotating shaft 11 and the auxiliary rotating shaft 15 pass through the body 1 and are rotatably connected to the body 1 through a rotating bracket 16; a plurality of main flue baffle brackets 18 are evenly provided on the main rotating shaft 11, and a plurality of bypass flue baffle brackets 19 are evenly provided on the auxiliary rotating shaft 15.
[0022] Working process or working principle:
[0023] During operation, high-temperature flue gas enters the main unit. Under normal operating conditions (high / medium heat demand), the drive motor 4 controls the synchronous movement of the first transmission plate 7, the first connecting rod 8, the second transmission plate 9, the second connecting rod 10, the third connecting rod 13, the third transmission plate 12, and the fourth transmission plate 14, thereby controlling the synchronous movement of the main rotating shaft 11 and the auxiliary rotating shaft 15. This, in turn, controls the opening of the main flue damper 17 and the closing of the bypass flue damper 5, allowing most or all of the flue gas to flow through the heat exchange tube assembly to heat the medium. When low heat is required, the drive motor 4 can be controlled to move in the opposite direction to close the main flue damper 17 and open the bypass flue 2, thus preventing the flue gas from passing through the heat exchange tube assembly and avoiding overheating or even vaporization and dry burning of the medium inside the tubes.
[0024] This invention can steplessly allocate the ratio of flue gas entering the heat exchanger tube assembly for heating and directly bypassing and exhausting, thereby precisely controlling the heat transferred to the cold medium, maintaining its outlet temperature stable at the set value, and completely avoiding dry burning of the heat exchanger tube assembly. It also eliminates the need for the bulky external bypass flue 2 and its associated structures, significantly saving valuable space and installation costs in the ship's engine room.
[0025] 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. An exhaust gas conditioning device for a marine waste heat economizer, characterized by: The device includes a main body (1), which has a main flue (3) and a bypass flue (2) inside. A main rotating shaft (11) and a secondary rotating shaft (15) are rotatably connected inside the main flue (3) and the bypass flue (2), respectively. A main flue baffle (17) and a bypass flue baffle (5) are fixedly connected to the main rotating shaft (11) and the secondary rotating shaft (15), respectively. A drive assembly is provided on the main body (1) through a support frame (6), and the drive assembly is connected to the main rotating shaft (11) and the secondary rotating shaft (15).
2. The marine waste economizer flue gas conditioning arrangement of claim 1, wherein: The main flue (3) is rotatably connected to two main rotating shafts (11), and the bypass flue (2) is rotatably connected to one auxiliary rotating shaft (15).
3. The marine waste economizer gas regulation device of claim 2, wherein: The main flue baffle (17) and the bypass flue baffle (5) are arranged at a 90° vertical angle.
4. The marine waste economizer gas regulation device of claim 3, wherein: The drive assembly includes a drive motor (4) fixed on the body (1), the drive motor (4) is connected to a first transmission plate (7) through a transmission device, a first connecting rod (8) is hinged on the first transmission plate (7), a second transmission plate (9) is hinged on the first connecting rod (8) and fixedly connected to one of the main rotating shafts (11), a second connecting rod (10) is hinged on the second transmission plate (9), a third connecting rod (13) and a third transmission plate (12) fixedly connected to the other main rotating shaft (11) are hinged on the second connecting rod (10), and a fourth transmission plate (14) fixedly connected to the auxiliary rotating shaft (15) is hinged on the third connecting rod (13).
5. An exhaust gas conditioning device for an exhaust economizer of a marine boiler according to any one of claims 1 - 4, characterized in that: The main rotating shaft (11) and the auxiliary rotating shaft (15) pass through the main body (1) and are rotatably connected to the main body (1) through the rotating bracket (16).
6. The marine waste heat economizer exhaust gas conditioning device according to claim 5, characterized in that: The main rotating shaft (11) is evenly provided with several main flue baffle supports (18), and the auxiliary rotating shaft (15) is evenly provided with several bypass flue baffle supports (19).