A cooling structure and a hull exhaust structure having the cooling structure

Abstract

The present invention relates to the field of ship equipment technology, and in particular to a cooling structure, including an exhaust pipe and a cooling shell; the cooling shell is covered on the outer wall of the exhaust pipe, and a cooling medium is passed through the chamber surrounded by the inner wall of the cooling shell and the outer wall of the exhaust pipe, and the pipe wall of the exhaust pipe is provided with a through hole, and the two ends of the through hole are respectively connected to the inner cavity of the exhaust pipe and the chamber. The cooling structure fully achieves the purpose of water-gas mixing and cooling, and has the advantages of energy saving and consumption reduction. The present invention also provides a hull exhaust structure, which also includes a main engine exhaust pipe and a ship's side outer plate, and 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 ship's side outer plate. The hull exhaust structure improves the heat dissipation effect of the ship's exhaust process, reduces the heat energy transferred to the hull by the exhaust pipe, and avoids problems such as paint peeling and aging caused by heating of the hull.

Description

Technical Field

[0001] The present invention relates to the technical field of ship equipment, and in particular to a cooling structure and a hull exhaust structure having the cooling structure. Background Art

[0002] The exhaust types of ships include dry exhaust type and wet exhaust type. The dry exhaust type generally has a chimney channel and is discharged above the compass deck. The wet exhaust type generally performs water-gas mixing and cooling at an appropriate position behind the supercharger, and then discharges the gas to both sides. The dry exhaust type has the disadvantages of large volume and mass, which is not conducive to the heat dissipation of the engine room. Although the wet exhaust type has slight advantages over the dry exhaust type in terms of volume and mass, the current wet exhaust structure design does not have an ideal cooling effect on the exhaust pipe. The existing wet exhaust type generally sprays coolant on the outer wall of the exhaust pipe to reduce the temperature of the pipe wall, and does not fully realize the meaning of water-gas mixing and cooling. Summary of the invention

[0003] In order to overcome the defects of the prior art mentioned above, the technical problem to be solved by the present invention is to provide a cooling structure and a hull exhaust structure having the cooling structure, which can improve the cooling effect of the wet exhaust type exhaust pipe.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a cooling structure, including an exhaust pipe and a cooling shell;

[0005] The cooling shell cover is arranged on the outer wall of the exhaust pipe, and a cooling medium flows through a chamber surrounded by the inner wall of the cooling shell and the outer wall of the exhaust pipe. A through hole is provided on the pipe wall of the exhaust pipe, and two ends of the through hole are respectively connected to the inner cavity of the exhaust pipe and the chamber.

[0006] In an optional embodiment, the cooling shell is arranged along the circumference of the exhaust pipe, and the two or more through holes are arranged on the pipe wall at intervals along the circumference of the exhaust pipe, and the two or more through holes are arranged on the pipe wall at intervals along the busbar of the exhaust pipe.

[0007] In an optional embodiment, the distance between any two adjacent through holes arranged along the busbar of the exhaust duct is in the range of 20 mm to 60 mm, and the number of the through holes arranged along the circumferential direction of the exhaust duct is 8 to 12.

[0008] In an optional embodiment, the diameter of the through hole ranges from 5 mm to 15 mm.

[0009] In an optional embodiment, a cooling medium inlet is opened on the side wall of the cooling shell, and the flux of the cooling medium inlet is greater than the flux of the through hole.

[0010] In an optional 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 shell are both circular.

[0011] In an optional embodiment, the exhaust pipe and the cooling shell are connected by welding.

[0012] The present invention also provides a hull exhaust structure, which also includes a main engine exhaust pipe and a ship side outer plate, wherein 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 ship side outer plate.

[0013] In an optional embodiment, a refrigeration system is further included, and the cooling medium is cooling water. The cooling water is cooled by the refrigeration system and then passed into the chamber.

[0014] In an optional embodiment, a seat plate is further included, which is welded to the inner wall of the ship's side outer plate, the exhaust pipe is locked to the seat plate, and the seat plate has an opening corresponding to the exhaust port of the ship's side outer plate.

[0015] The beneficial effects of the present invention are: providing a cooling structure, covering the cooling shell on the outer wall of the exhaust duct, and forming a chamber for storing and circulating the cooling medium through the inner wall of the cooling shell and the outer wall of the exhaust duct. This closed cooling structure can avoid the temperature rise in the cabin, and a through hole is opened on the wall of the exhaust duct so that the chamber is connected with the inner cavity of the exhaust duct. The cooling medium in the chamber contacts with the outer wall of the exhaust duct and then exchanges heat, so that the temperature of the outer wall of the exhaust duct is reduced. Since the hot gas flow rate in the exhaust duct is high and the pressure is low, it is easy for the cooling medium to enter the inner cavity of the exhaust duct through the through hole, contact with the inner wall of the exhaust duct for heat exchange, and fully achieve the purpose of water-gas mixing and cooling, and has the advantages of energy saving and consumption reduction. The present invention also provides a hull exhaust structure, wherein the air inlet end of the exhaust pipe is connected to the main engine exhaust pipe, and the air outlet end of the exhaust pipe is connected to the exhaust port of the ship's side outer plate. According to the working principle of the above-mentioned 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 cooled down and turned into low-temperature gas under the cooling effect of the cooling structure. The low-temperature gas and the cooling medium are discharged together from the exhaust port of the ship's side outer plate, thereby improving the heat dissipation effect of the ship's exhaust process, reducing the heat energy transferred to the hull by the exhaust pipe, and avoiding problems such as paint peeling and aging caused by heating of the hull. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a schematic diagram of the structure of the cooling structure of an embodiment of the present invention;

[0017] Figure 2 The AA cross-sectional view of the cooling structure of the embodiment of the present invention is shown;

[0018] Figure 3 The figure is a schematic structural diagram of a ship hull exhaust structure according to an embodiment of the present invention;

[0019] Description of labels:

[0020] 1. Exhaust duct; 11. Through hole;

[0021] 2. Cooling shell;

[0022] 3. Main engine exhaust pipe;

[0023] 4. Ship's side plate;

[0024] 5. Seat plate. DETAILED DESCRIPTION

[0025] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0026] Please refer to Figures 1 to 3 As shown, a cooling structure of the present invention comprises an exhaust pipe and a cooling shell;

[0027] The cooling shell cover is arranged on the outer wall of the exhaust pipe, and a cooling medium flows through a chamber surrounded by the inner wall of the cooling shell and the outer wall of the exhaust pipe. A through hole is provided on the pipe wall of the exhaust pipe, and two ends of the through hole are respectively connected to the inner cavity of the exhaust pipe and the chamber.

[0028] From the above description, it can be seen that the beneficial effects of the present invention are: providing a cooling structure, covering the cooling shell on the outer wall of the exhaust duct, and forming a chamber for storing and circulating the cooling medium through the inner wall of the cooling shell and the outer wall of the exhaust duct. This closed cooling structure can avoid the temperature rise in the cabin, and a through hole is opened on the wall of the exhaust duct so that the chamber is connected with the inner cavity of the exhaust duct. The cooling medium in the chamber contacts with the outer wall of the exhaust duct and then exchanges heat, so that the temperature of the outer wall of the exhaust duct is reduced. Since the hot gas flow rate in the exhaust duct is high and the pressure is low, it is easy for the cooling medium to enter the inner cavity of the exhaust duct through the through hole, contact with the inner wall of the exhaust duct for heat exchange, and fully achieve the purpose of water-gas mixing and cooling, and has the advantages of energy saving and consumption reduction.

[0029] Furthermore, the cooling shell is arranged along the circumference of the exhaust pipe, the two or more through holes are arranged on the pipe wall at intervals along the circumference of the exhaust pipe, and the two or more through holes are arranged on the pipe wall at intervals along the busbar of the exhaust pipe.

[0030] From the above description, it can be seen that the structural design of introducing 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.

[0031] Furthermore, the distance between any two adjacent through holes arranged along the busbar of the exhaust duct is in the range of 20 mm to 60 mm, and the number of the through holes arranged along the circumferential direction of the exhaust duct is 8 to 12.

[0032] From the above description, it can be seen that experimentally measured that the through-hole arrangement structure within this range can fully realize the heat exchange effect between the cooling medium and the pipe wall of the exhaust pipe and the hot air in the exhaust pipe, and balance the load of the refrigeration system to achieve the purpose of energy saving and consumption reduction.

[0033] Furthermore, the aperture of the through hole ranges from 5 mm to 15 mm.

[0034] From the above description, it can be seen that if the aperture of the through hole is designed to be too large, the heat exchange time of the cooling medium on the outer wall of the exhaust pipe will be shortened accordingly, which not only increases the energy consumption but also affects the cooling effect of the exhaust pipe; if the aperture of the through hole is designed to be too small, it will be unfavorable for the cooling medium to enter the inner cavity of the exhaust pipe, reduce the water vapor mixing effect of the cooling medium and the hot air, and also affect the cooling effect.

[0035] Furthermore, a cooling medium inlet is formed on the side wall of the cooling shell, and the flux of the cooling medium inlet is greater than the flux of the through hole.

[0036] From the above description, it can be seen that the flux of the cooling medium inlet is designed to be greater than the total flux of the through hole, that is, to ensure that the cooling medium should fill the entire chamber and have a certain kinetic energy when the cooling medium passes through the through hole, so as to achieve better cooling of the side wall of the exhaust pipe and sufficient water vapor mixing cooling.

[0037] Furthermore, the cross-sectional shape of the pipe wall of the exhaust pipe and the cross-sectional shape of the inner wall of the cooling shell are both circular.

[0038] From the above description, it can be seen that 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.

[0039] Furthermore, the exhaust pipe and the cooling shell are connected by welding.

[0040] From the above description, it can be seen that the exhaust duct and the cooling shell are prefabricated and welded, and can be directly installed on the required equipment, which reduces the difficulty of on-site installation and is conducive to improving production.

[0041] A hull exhaust structure also includes a main engine exhaust pipe and a ship side outer plate, wherein 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 ship side outer plate.

[0042] From the above description, it can be seen that the beneficial effects of the present invention are: providing a hull exhaust structure, the air inlet end of the exhaust pipe is connected to the main engine exhaust pipe, and the air outlet end of the exhaust pipe is connected to the exhaust port of the ship's side outer plate. According to the working principle of the above-mentioned cooling structure, the high-temperature gas generated by the main engine is passed into the exhaust pipe through the main engine exhaust pipe, and then cooled down and turned into low-temperature gas under the cooling effect of the cooling structure. The low-temperature gas and the cooling medium are discharged together from the exhaust port of the ship's side outer plate, thereby improving the heat dissipation effect of the ship's exhaust process, reducing the heat energy transferred to the hull by the exhaust pipe, and avoiding problems such as paint peeling and aging caused by heating of the hull.

[0043] Furthermore, it also 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.

[0044] From the above description, it can be seen that seawater can be used for refrigeration in a manner that suits local conditions. The seawater after the cooling operation is directly discharged into the ocean, which reduces the energy consumption of the refrigeration process and is energy-saving and environmentally friendly.

[0045] Furthermore, it also includes a seat plate, which is welded to the inner wall of the ship's side outer plate, the exhaust pipe is locked to the seat plate, and the seat plate has an opening corresponding to the exhaust port of the ship's side outer plate.

[0046] From the above description, it can be seen that the exhaust duct is indirectly connected to the ship side plate through the seat plate, which further reduces the heat conduction capacity between the exhaust duct and the ship side plate, plays a certain protective role on the ship side plate, avoids paint peeling and aging due to heat, and improves the stability of the installation structure.

[0047] Please refer to Figure 1 and Figure 2As shown, the first embodiment of the present invention is: a cooling structure, including an exhaust pipe 1 and a cooling shell 2, the exhaust pipe 1 and the cooling shell 2 are both made of steel, the exhaust pipe 1 is a seamless steel pipe of φ219×13-321, and the specification of the cooling shell 2 is φ273×9-200; the cooling shell 2 is covered on the outer wall of the exhaust pipe 1, and the chamber surrounded by the inner wall of the cooling shell 2 and the outer wall of the exhaust pipe 1 is filled with cooling medium, and the pipe wall of the exhaust pipe 1 is provided with a through hole 11, and the two ends of the through hole 11 are respectively connected with the inner cavity of the exhaust pipe 1 and the chamber. The through hole 11 is opened obliquely, and there is an angle between the opening direction of the through hole 11 and the diameter of the exhaust pipe 1, and the angle between the through hole 11 and the exhaust pipe 1 increases or decreases periodically along the axial direction of the exhaust pipe 1, and the range of the angle is 5° to 15°. According to the installation method of the exhaust pipe 1, the structure of the through hole 11 should also be adaptively adjusted. The aperture of the through hole 11 at a lower level should be smaller than the aperture of the through hole 11 at a higher level, so as to ensure that the flux of the through hole 11 in the circumferential direction is uniform. The cooling shell 2 is arranged along the circumference of the exhaust pipe 1, and more than two through holes 11 are evenly distributed on the pipe wall along the circumference of the exhaust pipe 1, and more than two through holes 11 are arranged on the pipe wall along the busbar of the exhaust pipe 1. The number of through holes 11 arranged along the busbar of the exhaust pipe 1 is 4 in this embodiment, the spacing between any two adjacent through holes 11 arranged along the busbar of the exhaust pipe 1 is 20 mm in this embodiment, and the number of through holes 11 arranged along the circumferential direction of the exhaust pipe 1 is 8 in this embodiment. The aperture of the through hole 11 is 5 mm in this embodiment. A cooling medium inlet is opened on the side wall of the cooling shell 2, and the flux of the cooling medium inlet is greater than the sum of the fluxes of all the through holes 11. The cooling shell 2 is provided with an extended pipe at the cooling medium inlet in a direction tangent to the pipe wall of the exhaust pipe 1, which helps the cooling medium to generate vortex in the cooling chamber, so that the cooling time is longer and the heat exchange effect is better. The end of the extended pipe is provided with a pipe flange. The specification of the extended pipe is φ76×8. The material of the pipe flange is DN65-PN6RF (series II) GB9119-2000. The cross-sectional shape of the pipe wall of the exhaust pipe 1 and the cross-sectional shape of the inner wall of the cooling shell 2 are both circular. Exhaust pipe flanges are provided at both ends of the exhaust pipe 1, and the total axial length of the exhaust pipe 1 is 341mm. The distance from one end of the cooling shell 2 to one end of the exhaust pipe 1 is 70mm, and the distance from the other end of the cooling shell 2 to the other end of the exhaust pipe 1 is 71mm. The material of the exhaust pipe flange is DN200-PN6RF (series II) GB9119-2000. The total length of the cooling shell 2 projected on the axis of the exhaust pipe 1 is 200mm. The exhaust pipe 1 and the cooling shell 2 are welded.The cooling shell 2 includes a sleeve and a steel sealing plate. The sleeve is coaxially arranged outside the exhaust pipe 1. Both ends of the sleeve are connected to the outer wall of the exhaust pipe 1 through two annular steel sealing plates. The steel sealing plates are welded to the sleeve and the outer wall of the exhaust pipe 1 respectively.

[0048] The exhaust pipe 1 and the cooling shell 2 are prefabricated in an integral workshop. First, a through hole 11 is processed on the exhaust pipe 1, and then the sleeve and the steel sealing plate are correspondingly installed on the outer wall of the exhaust pipe 1 with the through hole 11 and welded, and finally the exhaust pipe flange and the connecting pipe flange are welded.

[0049] Please refer to Figure 1 and Figure 2 As shown, the difference between the second embodiment of the present invention and the first embodiment is that the distance between any two adjacent through holes 11 arranged along the busbar of the exhaust duct 1 is 40 mm in this embodiment, and the number of the through holes 11 arranged 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.

[0050] Please refer to Figure 1 and Figure 2 As shown, the difference between the third embodiment of the present invention and the first embodiment is that the distance between any two adjacent through holes 11 arranged along the busbar of the exhaust duct 1 is 60 mm in this embodiment, and the number of the through holes 11 arranged 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.

[0051] 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 comprising a main engine exhaust pipe 3 and a shipboard outer plate 4, the two ends of the exhaust pipe 1 being connected to the exhaust port of the main engine exhaust pipe 3 and the exhaust port of the shipboard outer plate 4 respectively. It also comprises 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. It also comprises a seat plate 5, the seat plate 5 is welded to the inner wall of the shipboard outer plate 4, the exhaust pipe 1 is locked with the seat plate 5, and the seat plate 5 has an opening corresponding to the exhaust port of the shipboard outer plate 4. The diameter of the opening is 235 mm.

[0052] In summary, the present invention provides a cooling structure, in which a cooling shell 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 shell and the outer wall of the exhaust pipe. This closed cooling structure can avoid the temperature rise in the cabin, and a through hole is opened on the wall of the exhaust pipe so that the chamber is connected to the inner cavity of the exhaust pipe. The cooling medium in the chamber contacts the outer wall of the exhaust pipe for heat exchange, so that the temperature of the outer wall of the exhaust pipe is reduced. Since the hot gas flow rate 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 hole and contact the inner wall of the exhaust pipe for heat exchange, so as to fully achieve the purpose of water-gas mixing and cooling, and has the advantages of energy saving and consumption reduction. The structural design of introducing the cooling medium through multiple holes can improve the uniformity and efficiency of the heat dissipation of the exhaust pipe, and prevent aging, carbon deposition and other problems caused by uneven pipe wall temperature. It has been experimentally measured that the through hole arrangement structure within this 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, so as to achieve the purpose of energy saving and consumption reduction. If the aperture of the through hole is designed to be too large, the heat exchange time of the cooling medium on the outer wall of the exhaust duct will be shortened accordingly, which not only increases energy consumption, but also affects the cooling effect of the exhaust duct; if the aperture of the through hole is designed to be too small, it is not conducive to the cooling medium entering the inner cavity of the exhaust duct, reducing the water vapor mixing effect of the cooling medium and the hot air, and also affecting the cooling effect. The flux of the cooling medium inlet is designed to be greater than the total flux of the through hole, that is, to ensure that the cooling medium should fill the entire chamber, and the cooling medium has a certain kinetic energy when passing through the through hole, so as to achieve better cooling of the side wall of the exhaust duct and sufficient water vapor mixing and cooling. The circular cross-section design increases the heat exchange area between the cooling medium and the exhaust duct, and can reduce the energy consumption generated during the cooling operation. The exhaust duct and the cooling shell are prefabricated and welded, 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 air inlet end of the exhaust pipe is connected to the main engine exhaust pipe, and the air outlet end of the exhaust pipe is connected to the exhaust port of the ship's outer plate. According to the working principle of the above cooling structure, the high-temperature gas generated by the main engine is passed into the exhaust pipe through the main engine exhaust pipe, and then cooled down to become low-temperature gas under the cooling effect of the cooling structure. The low-temperature gas and the cooling medium are discharged together from the exhaust port of the ship's outer plate, thereby improving the heat dissipation effect of the ship's exhaust process, reducing the heat energy transferred to the hull by the exhaust pipe, and avoiding the problems of paint peeling and aging caused by the hull being heated. Cooling water is used for refrigeration in a manner adapted to local conditions, and the cooling water after the cooling operation is directly discharged into the ocean, which reduces the energy consumption of the refrigeration process and is energy-saving and environmentally friendly. The exhaust pipe is indirectly connected to the ship's side plate through the seat plate, which further reduces the heat conduction capacity between the exhaust pipe and the ship's side plate, plays a certain protective role on the ship's side plate, avoids its paint peeling and aging due to heat, and improves the stability of the installation structure.

[0053] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A cooling structure, characterized in that: including an exhaust duct and a cooling housing; The cooling housing cover is arranged on the outer wall of the exhaust pipe, a cooling medium is passed through the chamber surrounded by the inner wall of the cooling housing and the outer wall of the exhaust pipe, a through hole is arranged on the pipe wall of the exhaust pipe, and two ends of the through hole are respectively connected with the inner cavity of the exhaust pipe and the chamber; The cooling shell is arranged along the circumference of the exhaust pipe, the two or more through holes are arranged on the pipe wall along the circumference of the exhaust pipe at intervals, and the two or more through holes are arranged on the pipe wall along the busbar of the exhaust pipe at intervals; The aperture range of the through hole is 5 mm to 15 mm; The aperture of the different through holes increases with the increase of the horizontal height; The through hole is opened at an angle, and an angle is formed between the opening direction of the through hole and the diameter of the exhaust pipe. The size of the angle increases or decreases along the axial period of the exhaust pipe, and the range of the angle is 5° to 15°; The cooling shell is provided with an extended connecting pipe at the cooling medium inlet in a direction tangent to the pipe wall of the exhaust pipe; the side wall of the cooling shell 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.

2. The cooling structure according to claim 1, characterized in that: The spacing between any two adjacent through holes arranged along the busbar of the exhaust duct is in the range of 20 mm to 60 mm, and the number of the through holes arranged along the circumferential direction of the exhaust duct is 8 to 12.

3. The 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 shell are both circular.

4. The cooling structure according to claim 1, characterized in that: The exhaust pipe and the cooling shell are connected by welding.

5. A hull exhaust structure having a cooling structure according to any one of claims 1 to 4, characterized in that: It also includes a main engine exhaust pipe and a ship side outer plate, and 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 ship side outer plate.

6. The ship hull exhaust structure according to claim 5, characterized in that: It also includes a refrigeration system, the cooling medium is cooling water, and the cooling water is cooled by the refrigeration system and then flows into the chamber.

7. The ship hull exhaust structure according to claim 5, characterized in that: It also includes a seat plate, which is welded to the inner wall of the ship's side outer plate, the exhaust pipe is locked with the seat plate, and the seat plate has an opening corresponding to the exhaust port of the ship's side outer plate.

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