Wet type exhaust pipeline cooling structure
By designing a cooling structure of the cooling shell and through-holes on the wet exhaust pipe, the problem of the existing wet exhaust structure not ideal for the cooling effect of the exhaust pipe is solved, and effective cooling of the exhaust pipe and mixed cooling of the water and gas are achieved, which has the advantages of energy saving and consumption reduction.
Patent Information
- Application Number
- CN202510097539.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2020-09-08
- Publication Date
- 2025-05-27
AI Technical Summary
The existing wet exhaust structure has poor cooling effect on the exhaust pipe and has not fully realized the significance of water and gas mixed cooling.
A wet exhaust pipe cooling structure is designed, including an exhaust pipe and a cooling shell. The cooling shell cover is provided on the outer wall of the exhaust pipe. The inner wall is connected with the chamber surrounded by the outer wall of the exhaust pipe. The exhaust pipe pipe wall is provided with a through hole, and the two ends of the through hole are respectively connected to the inner cavity and chamber of the exhaust pipe.
By exchanging heat with the outer wall and inner wall of the exhaust pipe, the temperature of the outer wall and inner wall of the exhaust pipe is effectively reduced, the purpose of water and gas mixing and cooling is achieved, and the advantages of energy saving and consumption reduction are also achieved.
Smart Images
Figure CN120042679A_ABST
Abstract
Description
[0001] This divisional application is based on the mother patent of an invention patent with an application date of September 8, 2020, an application number of CN202010932788.5, and a title of "A Cooling Structure and a Hull Exhaust Structure with the Cooling Structure". Technical Field
[0002] The present invention relates to the technical field of ship equipment, and in particular to a wet exhaust pipe cooling structure. Background Art
[0003] The exhaust forms of ships include dry exhaust forms and wet exhaust forms. The dry exhaust form generally sets up a chimney passage and discharges it above the compass deck. The wet exhaust form generally mixes water and gas for cooling at an appropriate position behind the supercharger, and then discharges the gas to both sides. The dry exhaust form has the disadvantages of large volume, large mass, and being unfavorable for the heat dissipation of the engine room. Although the wet exhaust form has a slight advantage over the dry exhaust form in terms of volume and mass, the current design of the wet exhaust structure is not ideal for cooling the exhaust pipe. The existing wet exhaust form generally sprays coolant on the outer wall of the exhaust pipe by spraying to reduce the wall temperature, and does not fully realize the meaning of water-gas mixing and cooling. Summary of the Invention
[0004] In order to overcome the above defects of the prior art, the technical problem to be solved by the present invention is to provide a wet exhaust pipe cooling structure, which can improve the cooling effect on the exhaust pipe of the wet exhaust form.
[0005] In order to solve the above technical problem, the technical solution adopted by the present invention is: a wet exhaust pipe cooling structure, including an exhaust pipe and a cooling housing; The cooling housing covers the outer wall of the exhaust pipe, and a cooling medium is passed through the chamber formed by the inner wall of the cooling housing and the outer wall of the exhaust pipe. The pipe wall of the exhaust pipe is provided with through holes, and both ends of the through holes are respectively communicated with the inner cavity of the exhaust pipe and the chamber.
[0006] In an alternative embodiment, the cooling housing is arranged along the circumferential direction of the exhaust pipe, and two or more of the through holes are arranged at intervals along the circumferential direction of the exhaust pipe on the pipe wall, and two or more of the through holes are arranged at intervals along the generatrix of the exhaust pipe on the pipe wall.
[0007] In an alternative embodiment, the distance between any two adjacent through holes arranged at intervals along the generatrix of the exhaust pipe ranges from 20 mm to 60 mm, and the number of the through holes arranged at intervals along the circumferential direction of the exhaust pipe is 8 to 12.
[0008] In an alternative embodiment, the aperture range of the through holes is 5 mm to 15 mm.
[0009] In an alternative embodiment, a cooling medium inlet is provided in the side wall of the cooling housing, and the flux of the cooling medium inlet is greater than that of the through hole.
[0010] In an alternative embodiment, the cross-sectional shape of the pipe wall of the exhaust pipe and the cross-sectional shape of the inner wall of the cooling housing are both circular.
[0011] In an alternative embodiment, the exhaust pipe and the cooling housing are connected by welding.
[0012] The present invention also provides a hull exhaust structure, which further includes a main engine exhaust pipe and an outer hull plate. The two ends of the exhaust pipe are respectively connected to the exhaust port of the main engine exhaust pipe and the exhaust port of the outer hull plate.
[0013] In an alternative embodiment, a refrigeration system is further included. The cooling medium is cooling water, and the cooling water is introduced into the chamber after being cooled by the refrigeration system.
[0014] In an alternative embodiment, a seat plate is further included. The seat plate is welded to the inner wall of the outer hull plate. The exhaust pipe is locked to the seat plate, and the seat plate has an opening corresponding to the exhaust port of the outer hull plate.
[0015] The beneficial effects of the present invention are as follows: A cooling structure is provided, in which the cooling housing is sleeved on the outer wall of the exhaust pipe. A chamber for storing and circulating the cooling medium is formed by the inner wall of the cooling housing and the outer wall of the exhaust pipe. This closed cooling structure can prevent the temperature in the cabin from rising. Through holes are provided on the pipe wall of the exhaust pipe to communicate the chamber with the inner cavity of the exhaust pipe. The cooling medium in the chamber exchanges heat with the outer wall of the exhaust pipe after contact, so that the temperature of the outer wall of the exhaust pipe is reduced. Since the hot air flow velocity in the exhaust pipe is high and the pressure is low, it is easy for the cooling medium to enter the inner cavity of the exhaust pipe through the through holes and exchange heat with the inner wall of the exhaust pipe, fully achieving the purpose of cooling by mixing water and gas, and having the advantages of energy conservation and consumption reduction. The present invention also provides a hull exhaust structure. The intake end of the exhaust pipe is connected to the main engine exhaust pipe, and the outlet end of the exhaust pipe is connected to the exhaust port of the outer hull plate. According to the working principle of the above cooling structure, the high-temperature gas generated by the main engine is introduced into the exhaust pipe through the main engine exhaust pipe, and then is cooled to a low-temperature gas under the cooling effect of the cooling structure. The low-temperature gas and the cooling medium are jointly discharged from the exhaust port of the outer hull plate, thereby improving the heat dissipation effect during the exhaust process of the ship, reducing the heat energy transferred from the exhaust pipe to the hull, and avoiding problems such as paint peeling and aging of the hull caused by heat. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The figure shows a schematic structural diagram of the cooling structure according to an embodiment of the present invention; Figure 2The figure shows the A-A sectional view of the cooling structure according to an embodiment of the present invention; Figure 3 The figure shows the schematic structural view of the hull exhaust structure according to an embodiment of the present invention; Label description: 1. Exhaust pipe; 11. Through hole; 2. Cooling housing; 3. Main engine exhaust pipe; 4. Outer hull plate; 5. Seat plate. Specific implementation manner
[0017] To describe in detail the technical content, achieved objectives and effects of the present invention, the following is described in conjunction with the embodiments and with reference to the drawings.
[0018] Please refer to Figures 1 to 3 As shown, a cooling structure of the present invention includes an exhaust pipe and a cooling housing; The cooling housing covers the outer wall of the exhaust pipe. A cooling medium flows through the chamber formed by the inner wall of the cooling housing and the outer wall of the exhaust pipe. The pipe wall of the exhaust pipe is provided with through holes, and both ends of the through holes are respectively communicated with the inner cavity of the exhaust pipe and the chamber.
[0019] It can be seen from the above description that the beneficial effect of the present invention is to provide a cooling structure. The cooling housing is covered on the outer wall of the exhaust pipe, and a chamber for storing and circulating the cooling medium is formed by the inner wall of the cooling housing and the outer wall of the exhaust pipe. This closed cooling structure can avoid the rise of the temperature in the cabin. Through holes are opened on the pipe wall of the exhaust pipe so that the chamber is communicated with the inner cavity of the exhaust pipe. The cooling medium in the chamber contacts the outer wall of the exhaust pipe and then conducts heat exchange, so that the temperature of the outer wall of the exhaust pipe is reduced. Since the hot air flow velocity in the exhaust pipe is high and the pressure is low, it is easy for the cooling medium to enter the inner cavity of the exhaust pipe through the through holes and contact the inner wall of the exhaust pipe for heat exchange, fully achieving the purpose of cooling by mixing water and gas, and having the advantages of energy saving and consumption reduction.
[0020] Furthermore, the cooling housing is arranged along the circumferential direction of the exhaust pipe. Two or more of the through holes are arranged at intervals along the circumferential direction of the exhaust pipe on the pipe wall, and two or more of the through holes are arranged at intervals along the generatrix of the exhaust pipe on the pipe wall.
[0021] It can be seen from the above description that the structural design of introducing the cooling medium through multiple holes can improve the uniformity and efficiency of heat dissipation of the exhaust pipe, and prevent problems such as aging and carbon deposition caused by uneven pipe wall temperature.
[0022] Further, the distance between any two adjacent through holes arranged at intervals along the generatrix of the exhaust pipe ranges from 20 mm to 60 mm, and the number of through holes arranged at intervals along the circumferential direction of the exhaust pipe is 8 to 12.
[0023] As can be seen from the above description, through experiments, it is measured that the through hole arrangement structure within this interval range can fully realize the heat exchange effect between the cooling medium and the pipe wall of the exhaust pipe and the hot gas in the exhaust pipe, and balance the load of the refrigeration system, achieving the purpose of energy conservation and consumption reduction.
[0024] Further, the aperture range of the through hole is 5 mm to 15 mm.
[0025] As can be seen from the above description, if the aperture of the through hole is designed too large, the heat exchange time of the cooling medium on the outer wall of the exhaust pipe will be correspondingly shortened, which not only increases energy consumption but also affects the cooling effect of the exhaust pipe; if the aperture of the through hole is designed too small, it is not conducive to the cooling medium entering the inner cavity of the exhaust pipe, reducing the water-vapor mixing effect between the cooling medium and the hot gas, and also causing the cooling effect to be affected.
[0026] Further, a cooling medium inlet is provided on the side wall of the cooling housing, and the flux of the cooling medium inlet is greater than the flux of the through hole.
[0027] As can be seen from the above description, designing the flux of the cooling medium inlet to be greater than the total flux of the through holes ensures that the cooling medium should fill the entire chamber and has a certain kinetic energy when passing through the through holes, so as to achieve better cooling of the side wall of the exhaust pipe and sufficient water-vapor mixing cooling.
[0028] Further, the cross-sectional shape of the pipe wall of the exhaust pipe and the cross-sectional shape of the inner wall of the cooling housing are both circular.
[0029] As can be seen from the above description, the circular cross-sectional design increases the heat exchange area between the cooling medium and the exhaust pipe and can reduce the energy consumption generated during the cooling operation.
[0030] Further, the exhaust pipe and the cooling housing are connected by welding.
[0031] As can be seen from the above description, the exhaust pipe and the cooling housing are prefabricated and welded together, which can be directly installed on the required equipment, reducing the difficulty of on-site installation and facilitating production improvement.
[0032] A hull exhaust structure further includes a main engine exhaust pipe and an outer shipboard plate, and both ends of the exhaust pipe are respectively connected to the exhaust port of the main engine exhaust pipe and the exhaust port of the outer shipboard plate.
[0033] As can be seen from the above description, the beneficial effects of the present invention are as follows: A hull exhaust structure is provided, where the intake end of the exhaust pipe is connected to the main engine exhaust pipe, and the outlet end of the exhaust pipe is connected to the exhaust port on the outer hull plate. According to the working principle of the above cooling structure, the high-temperature gas generated by the main engine enters the exhaust pipe through the main engine exhaust pipe, and then cools down to become low-temperature gas under the cooling effect of the cooling structure. The low-temperature gas and the cooling medium are jointly discharged from the exhaust port on the outer hull plate, thereby improving the heat dissipation effect during the ship exhaust process, reducing the heat energy transferred from the exhaust pipe to the hull, and avoiding problems such as paint peeling and aging caused by the hull being heated.
[0034] Furthermore, a refrigeration system is further included. The cooling medium is cooling water, and the cooling water is cooled by the refrigeration system and then introduced into the chamber.
[0035] As can be seen from the above description, seawater can be used for refrigeration in a local conditions-adapted manner, and the seawater after the cooling operation is directly discharged into the ocean, reducing the energy consumption during the refrigeration process, and being energy-saving and environmentally friendly.
[0036] Furthermore, a seat plate is further included. The seat plate is welded to the inner wall of the outer hull plate, the exhaust pipe is locked to the seat plate, and the seat plate has an opening corresponding to the exhaust port on the outer hull plate.
[0037] As can be seen from the above description, the exhaust pipe is indirectly connected to the hull plate through the seat plate, further reducing the heat conduction ability between the exhaust pipe and the hull plate, playing a certain protective role for the hull plate, avoiding paint peeling and aging due to heat, and improving the stability of the installation structure.
[0038] Please refer to Figure 1 and Figure 2As shown in the figure, Embodiment 1 of the present invention is: a cooling structure, including an exhaust pipe 1 and a cooling housing 2. The materials of the exhaust pipe 1 and the cooling housing 2 are both steel. The exhaust pipe 1 is a seamless steel pipe with a size of φ219×13 - 321, and the specification of the cooling housing 2 is φ273×9 - 200. The cooling housing 2 covers the outer wall of the exhaust pipe 1, and a cooling medium is passed through the chamber formed by the inner wall of the cooling housing 2 and the outer wall of the exhaust pipe 1. The pipe wall of the exhaust pipe 1 is provided with through holes 11, and both ends of the through holes 11 are respectively communicated with the inner cavity of the exhaust pipe 1 and the chamber. The through holes 11 are inclinedly arranged, and there is an included angle between the opening direction of the through holes 11 and the diameter of the exhaust pipe 1. The included angle between the through holes 11 and the exhaust pipe 1 periodically increases or decreases along the axial direction of the exhaust pipe 1, and the range of the included angle is 5° - 15°. According to the installation method of the exhaust pipe 1, the structure of the through holes 11 should also be adjusted adaptively. The aperture of the through holes 11 at a lower horizontal height should be smaller than that of the through holes 11 at a higher horizontal height, so as to ensure the uniform flux of the through holes 11 in the circumferential direction. The cooling housing 2 is arranged along the circumferential direction of the exhaust pipe 1, and two or more of the through holes 11 are evenly distributed along the circumferential direction of the exhaust pipe 1 on the pipe wall, and two or more of the through holes 11 are arranged at intervals along the generatrix of the exhaust pipe 1 on the pipe wall. The number of the through holes 11 arranged at intervals along the generatrix of the exhaust pipe 1 is 4 in this embodiment, the distance between any two adjacent through holes 11 arranged at intervals along the generatrix of the exhaust pipe 1 is 20 mm in this embodiment, and the number of the through holes 11 arranged at intervals along the circumferential direction of the exhaust pipe 1 is 8 in this embodiment. The aperture of the through holes 11 is 5 mm in this embodiment. The side wall of the cooling housing 2 is provided with a cooling medium inlet, and the flux of the cooling medium inlet is greater than the sum of the fluxes of all the through holes 11. The cooling housing 2 is provided with an extension pipe at the cooling medium inlet along the direction tangent to the pipe wall of the exhaust pipe 1, which helps the cooling medium to generate a swirl in the cooling chamber, with a longer cooling time and better heat exchange effect. The end of the extension pipe is provided with a pipe flange. The specification of the extension pipe is φ76×8. The material of the pipe flange is DN65 - PN6RF (Series II) GB9119 - 2000. The cross-sectional shapes of the pipe wall of the exhaust pipe 1 and the inner wall of the cooling housing 2 are both circular. Both ends of the exhaust pipe 1 are provided with exhaust pipe flanges, and the total axial length of the exhaust pipe 1 is 341 mm. The distance from one end of the cooling housing 2 to one end of the exhaust pipe 1 is 70 mm, and the distance from the other end of the cooling housing 2 to the other end of the exhaust pipe 1 is 71 mm. The material of the exhaust pipe flange is DN200 - PN6RF (Series II) GB9119 - 2000. The total length of the projection of the cooling housing 2 on the axis of the exhaust pipe 1 is 200 mm. The exhaust pipe 1 and the cooling housing 2 are welded together.The cooling housing 2 includes a sleeve and steel sealing plates. The sleeve is coaxially arranged around the exhaust duct 1, and both ends of the sleeve are connected to the outer wall of the exhaust duct 1 through two annular steel sealing plates respectively. The steel sealing plates are welded to the sleeve and the outer wall of the exhaust duct 1 respectively.
[0039] The exhaust duct 1 and the cooling housing 2 are prefabricated in an integral workshop. First, through holes 11 are machined on the exhaust duct 1, then the sleeve and the steel sealing plates are correspondingly installed on the outer wall of the exhaust duct 1 with the through holes 11 and welded, and finally the exhaust pipe flange and the connecting pipe flange are welded and installed.
[0040] Please refer to Figure 1 and Figure 2 As shown, the difference between the second embodiment and the first embodiment of the present invention is that: the distance between any two adjacent through holes 11 arranged at intervals along the generatrix of the exhaust duct 1 is 40 mm in this embodiment, and the number of through holes 11 arranged at intervals along the circumferential direction of the exhaust duct 1 is 10 in this embodiment. The aperture of the through hole 11 is 10 mm in this embodiment.
[0041] Please refer to Figure 1 and Figure 2 As shown, the difference between the third embodiment and the first embodiment of the present invention is that: the distance between any two adjacent through holes 11 arranged at intervals along the generatrix of the exhaust duct 1 is 60 mm in this embodiment, and the number of through holes 11 arranged at intervals along the circumferential direction of the exhaust duct 1 is 12 in this embodiment. The aperture of the through hole 11 is 15 mm in this embodiment.
[0042] Please refer to Figure 3 As shown, the fourth embodiment of the present invention is: a hull exhaust structure having the cooling structure described in the first, second or third embodiment, further including a main engine exhaust pipe 3 and a ship's side outer plate 4. Both ends of the exhaust duct 1 are respectively connected to the exhaust port of the main engine exhaust pipe 3 and the exhaust port of the ship's side outer plate 4. It further includes a refrigeration system, the cooling medium is cooling water, and the cooling water is cooled by the refrigeration system and then introduced into the chamber. It further includes a seat plate 5, the seat plate 5 is welded to the inner wall of the ship's side outer plate 4, the exhaust duct 1 is locked to the seat plate 5, and the seat plate 5 has an opening corresponding to the exhaust port of the ship's side outer plate 4. The diameter of the opening is 235 mm.
[0043] In summary, the present invention provides a cooling structure. A cooling housing is sleeved on the outer wall of the exhaust pipe, and a chamber for storing and circulating a cooling medium is formed between the inner wall of the cooling housing and the outer wall of the exhaust pipe. This enclosed cooling structure can prevent the temperature in the cabin from rising. Through holes are formed in the wall of the exhaust pipe to connect the chamber with the inner cavity of the exhaust pipe. The cooling medium in the chamber exchanges heat with the outer wall of the exhaust pipe after contact, reducing the temperature of the outer wall of the exhaust pipe. Since the hot gas flow velocity in the exhaust pipe is high and the pressure is low, it is easy for the cooling medium to enter the inner cavity of the exhaust pipe through the through holes and exchange heat with the inner wall of the exhaust pipe, fully achieving the purpose of cooling by water-vapor mixing and having the advantages of energy conservation and consumption reduction. The structural design of using porous to introduce the cooling medium can improve the uniformity and efficiency of heat dissipation of the exhaust pipe, preventing problems such as aging and carbon deposition caused by uneven wall temperature. Through experiments, it is measured that the through-hole arrangement structure within this range can fully achieve the heat exchange effect between the cooling medium and the wall of the exhaust pipe and the hot gas in the exhaust pipe, and balance the load of the refrigeration system, achieving the purpose of energy conservation and consumption reduction. If the aperture of the through hole is designed too large, the heat exchange time of the cooling medium on the outer wall of the exhaust pipe will be correspondingly shortened, not only increasing energy consumption but also affecting the cooling effect of the exhaust pipe. If the aperture of the through hole is designed too small, it is not conducive to the cooling medium entering the inner cavity of the exhaust pipe, reducing the water-vapor mixing effect between the cooling medium and the hot gas, and also resulting in an affected cooling effect. The flux of the cooling medium inlet is designed to be greater than the total flux of the through holes, that is, to ensure that the cooling medium should fill the entire chamber and have a certain kinetic energy when passing through the through holes, so as to achieve better cooling of the side wall of the exhaust pipe and sufficient water-vapor mixing cooling. The circular cross-section design increases the heat exchange area between the cooling medium and the exhaust pipe and can reduce the energy consumption generated during the cooling operation. The exhaust pipe and the cooling housing are connected by prefabricated welding, which can be directly installed on the required equipment, reducing the difficulty of on-site installation and facilitating production improvement. The present invention also provides a hull exhaust structure. The intake end of the exhaust pipe is connected to the main engine exhaust pipe, and the outlet end of the exhaust pipe is connected to the exhaust port on the outer plate of the ship's side. According to the working principle of the above cooling structure, the high-temperature gas generated by the main engine passes through the main engine exhaust pipe into the exhaust pipe, and then cools down to a low-temperature gas under the cooling action of the cooling structure. The low-temperature gas and the cooling medium are jointly discharged from the exhaust port on the outer plate of the ship's side, thereby improving the heat dissipation effect during the ship's exhaust process, reducing the heat energy transferred from the exhaust pipe to the hull, and avoiding problems such as paint peeling and aging of the hull caused by heat. The cooling water is used for refrigeration in a local-condition-adapted manner, and the cooling water after the cooling operation is directly discharged into the ocean, reducing the energy consumption during the refrigeration process, being energy-saving and environment-friendly. The exhaust pipe is indirectly connected to the ship's side plate through a seat plate, further reducing the heat conduction ability between the exhaust pipe and the ship's side plate, playing a certain protective role for the ship's side plate, avoiding its paint peeling and aging due to heat, and improving the stability of the installation structure.
[0044] The above are only embodiments of the present invention, and do not thus limit the patent scope of the present invention. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the related technical fields, shall similarly be included within the patent protection scope of the present invention.
Claims
1. A wet exhaust pipe cooling structure, characterized in that, it includes an exhaust pipe and a cooling housing; the cooling housing covers the outer wall of the exhaust pipe, a cooling medium is passed through the chamber formed by the inner wall of the cooling housing and the outer wall of the exhaust pipe, through holes are provided on the pipe wall of the exhaust pipe, and both ends of the through holes are respectively communicated with the inner cavity of the exhaust pipe and the chamber; the cooling housing is arranged along the circumferential direction of the exhaust pipe, more than two of the through holes are arranged at intervals along the circumferential direction of the exhaust pipe on the pipe wall, and more than two of the through holes are arranged at intervals along the generatrix of the exhaust pipe on the pipe wall; the apertures of different through holes increase with the increase of the horizontal height; the through holes are obliquely opened, and there is an included angle between the opening direction of the through holes and the diameter of the exhaust pipe, and the size of the included angle periodically becomes larger or smaller along the axial direction of the exhaust pipe.
2. The wet exhaust pipe cooling structure according to claim 1, characterized in that, the distance range between any two adjacent through holes arranged at intervals along the generatrix of the exhaust pipe is 20 mm to 60 mm, and the number of through holes arranged at intervals along the circumferential direction of the exhaust pipe is 8 to 12.
3. The wet exhaust pipe cooling structure according to claim 1, characterized in that, the cross-sectional shape of the pipe wall of the exhaust pipe and the cross-sectional shape of the inner wall of the cooling housing are both circular.
4. The wet exhaust pipe cooling structure according to claim 1, characterized in that, the exhaust pipe and the cooling housing are welded and connected.
5. The wet exhaust pipe cooling structure according to claim 1, characterized in that, it further includes a refrigeration system, the cooling medium is cooling water, and the cooling water is passed into the chamber after being cooled by the refrigeration system.