A cold water channel and cover plate structure in an offshore converter station

Abstract

The present invention discloses a cold water channel in an offshore converter station, including a channel beam, a channel body, a side anti-bending plate, a bottom anti-bending plate and a cover plate, wherein the channel body is a U-shaped groove structure, the channel beam is installed on the upper end surface of the channel wall, the cover plate is installed on the channel beam, a one-way water flow hole is provided in the channel bottom plate and a water diversion pipe is welded, a side anti-bending plate is welded on the outer wall of the channel wall, a bottom anti-bending plate is welded on the outer surface of the channel bottom plate, the channel is arranged on both sides of the main structural beam below the deck and intersects the main structural beam vertically, the channel on one side of the main structural beam is a side channel for maintenance trolleys to pass, and the channel on the other side of the main structural beam is a side channel for non-maintenance trolleys to pass. The cold water channel in the offshore converter station of the present invention is located as a whole below the deck surface, ensuring that the deck height in the room is the same, facilitating the passage of maintenance trolleys and other construction and installation operations, the cooling water pipe is simple to install, and at the same time meets the requirements of ensuring indoor constant temperature and humidity operating conditions and normal operation of maintenance trolleys.

Description

Technical Field

[0001] The invention relates to a cooling water system of an offshore converter station, in particular to a cooling water channel in an offshore converter station. Background Art

[0002] As offshore wind farms develop towards the far coast and their capacity continues to expand, offshore converter stations have become an important carrier for flexible DC transmission. Offshore converter stations are different from offshore booster stations. The converter valve equipment in the converter station is the core of voltage conversion and has a large heat output. If air conditioning alone is used, it is difficult to reach the normal operating temperature. It is necessary to cool the converter valve by pumping seawater through the cooling water system.

[0003] The converter valve equipment room of the onshore converter station is placed on the ground, and the water inlet and outlet of the cooling water system can be realized by pre-buried water pipes, thereby ensuring the smooth maintenance passage in the equipment room. The upper block of the offshore converter station is composed of I-beams, with 6-8mm steel plates on top, and about 30mm thick dressing is laid on the plate as an insulation layer to ensure the constant temperature and humidity operating environment inside the valve hall. The top layer is a rubber floor layer, which plays a role in beauty and anti-slip. The inlet and outlet pipes of the cooling water system cannot be pre-buried like the onshore converter station, and a special channel needs to be set up to arrange the cooling water pipes. Considering the importance of cooling water pipe maintenance and the feasibility of its installation operation, the fully enclosed channel cannot meet the above requirements; and the cover plate channel needs to consider the constant temperature and humidity environment of the valve hall and the flatness of the ground when the maintenance vehicle is operating. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a cold water channel in an offshore converter station, wherein the channel has a cover plate and can ensure indoor constant temperature and humidity operating conditions and normal operation of a maintenance vehicle.

[0005] In order to solve the problems existing in the prior art, the technical solution adopted by the present invention is:

[0006] The cold water channel in the offshore converter station includes a channel beam, a channel body, side anti-bending plates, a bottom anti-bending plates and a cover plate. The channel body is a U-shaped groove structure composed of two channel walls and a channel bottom plate, and the cooling water inlet pipe and outlet pipe are arranged in the channel body; the channel beam is installed on the upper end surfaces of the two channel walls, the cover plate is installed on the channel beam, the channel bottom plate is provided with a one-way water flow hole and a water diversion pipe is welded, the outer wall of the channel wall is welded with a side anti-bending plate, and the outer surface of the channel bottom plate is welded with a bottom anti-bending plate. The channel is arranged on both sides of the main structural beam under the deck and intersects the main structural beam vertically. The channel on one side of the main structural beam is the side channel for maintenance trolleys to pass, and the channel on the other side of the main structural beam is the side channel for non-maintenance trolleys to pass.

[0007] Among them, the channel beams of the channel on the side where the maintenance trolley passes are made of H-shaped steel channel beams, and the channel beams of the channel on the side where the non-maintenance trolley passes are made of L-shaped angle steel channel beams.

[0008] Among them, the channel body is formed by welding rectangular steel plates, the channel wall of the channel on the side where the maintenance vehicle passes is welded to the bottom of the H-shaped steel channel beam using H-shaped steel, and the channel wall of the channel on the side where the non-maintenance vehicle passes is welded to the inner side of the vertical edge of the L-shaped angle steel channel beam using L-shaped angle steel.

[0009] Furthermore, embedded rectangular steel is arranged in the channel body at a certain height from the channel bottom plate, and the cooling water inlet pipe and outlet pipe are respectively installed on the embedded rectangular steel through fixed supports. The fixed support is composed of a fixed steel bottom plate and a rubber pad. The upper end of the fixed steel bottom plate is provided with an arc-shaped groove matching the water pipe, and the rubber pad is arranged between the fixed steel bottom plate and the water pipe.

[0010] Among them, the cover plate includes a cover plate bottom plate, a steel grating, a reinforcing angle steel, a limiting angle steel and a dressing; the steel grating is welded on the upper surface of the cover plate bottom plate, and the squares of the steel grating are filled with dressing; the reinforcing angle steel is welded to the lower surface of the cover plate bottom plate; the limiting angle steel is welded vertically to the plane of the reinforcing angle steel, and the length of the limiting angle steel is less than the net spacing of the channel beam.

[0011] Furthermore, a temporary lifting lug is welded on the bottom plate of the cover plate.

[0012] Furthermore, a detachable handle is provided on the cover plate of the non-maintenance trolley passage side channel in the maintenance area. The detachable handle comprises a pre-embedded screw, a handle and a bolt, the pre-embedded screw is welded to the bottom plate of the cover plate, and the two ends of the handle are detachably connected to the pre-embedded screw by bolts.

[0013] The advantages and beneficial effects of the present invention are:

[0014] 1. The cold water channel in the offshore converter station of the present invention is located as a whole below the deck surface, ensuring that the deck height in the room is the same, which is convenient for the passage of maintenance vehicles and other construction and installation operations. The cooling water pipe is easy to install, and at the same time meets the requirements of ensuring indoor constant temperature and humidity operating conditions and normal operation of maintenance vehicles.

[0015] 2. The cold water channels in the offshore converter station of the present invention are arranged on both sides of the main structural beam, namely the channel on the side where the maintenance vehicle passes and the channel on the side where the non-maintenance vehicle passes. Since different types of channels are used in different positions, the bearing capacity is ensured while reducing the overall weight of the structure, which has a certain degree of economy.

[0016] 3. The present invention improves the overall anti-bending performance of the channel because the side anti-bending plates and the bottom anti-bending plates are welded on the outer surface of the channel body for reinforcement.

[0017] 4. The present invention solves the problem of water accumulation during construction by arranging one-way drainage holes in different partitions of the channel bottom plate.

[0018] 5. The present invention provides a dressing on the cover plate to ensure a constant temperature and humidity operating environment in the valve hall.

[0019] 6. Since the present invention is provided with a limiting angle steel and a reinforcing angle steel at the bottom of the cover plate, the bearing capacity and anti-sliding property under the maintenance load can be ensured, and at the same time, the flatness of the ground when the maintenance trolley passes through can be ensured.

[0020] 7. The present invention provides movable handles on the cover plate in the local area, which ensures the overall flatness and beauty during non-maintenance operations and improves the difficulty and efficiency of later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings:

[0022] Figure 1 A three-dimensional schematic diagram of a cold water channel in an offshore converter station of the present invention;

[0023] Figure 2 This is the elevation view of the side channel for the maintenance of trolleys;

[0024] Figure 3 This is the elevation drawing of the side channel for non-maintenance vehicles;

[0025] Figure 4 is a schematic diagram of the three-dimensional structure of the cover;

[0026] Figure 5 This is the main view of the cover;

[0027] Figure 6 It is the side view of the cover;

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure when the cover plate is not filled with dressing;

[0029] Figure 8 This is a side view of the cover with a handle installed in the maintenance state;

[0030] Fig. 9 It is a schematic diagram of the three-dimensional structure of the auxiliary material block. DETAILED DESCRIPTION

[0031] like Figure 1-3As shown, the cold water channel in the offshore converter station of the present invention is arranged below the deck to ensure the smooth operation of the maintenance vehicle, and is cut off at the position of the main structural beam 11. It includes a channel beam, a channel body 33, a side anti-bending plate 34, a bottom anti-bending plate 35 and a cover plate 4. The channel body 33 includes two channel walls and a channel bottom plate. The two channel walls and a channel bottom plate form a U-shaped groove structure. The cooling water inlet pipe 21 and the outlet pipe 22 are arranged in the channel body. Considering the cross-sectional size of the cooling water pipe 2 and the structural requirements of passing through the main structural beam 11, the depth of the U-shaped groove in this embodiment is set to 1.5m. The channel beam is installed on the upper end surfaces of the two channel walls, and the two ends of the cover plate 4 are placed on the channel beam. The outer wall of the channel wall is welded with a side anti-bending plate 34, and the outer surface of the channel bottom plate is welded with a bottom anti-bending plate 35. According to the input conditions such as the weight of the water pipe and the maintenance load, the channels are evenly arranged at a certain distance. The channels are set on both sides of the main structural beam 11 and intersect the main structural beam 11 vertically. The channel on one side of the main structural beam 11 is the channel on the side where the maintenance trolley passes, and the channel on the other side of the main structural beam 11 is the channel on the side where the non-maintenance trolley passes. The channel bottom plates of the channel on the side where the maintenance trolley passes and the channel on the side where the non-maintenance trolley passes are both provided with one-way water flow holes and welded with water diversion pipes 36 to avoid water accumulation inside the channel during construction, which causes construction difficulties.

[0032] The channel beam uses steel sections of different cross-sectional sizes according to the location of the channel. The channel beam of the channel on the maintenance trolley side uses an H-shaped steel channel beam 31, and the channel beam of the channel on the non-maintenance trolley side uses an L-shaped angle steel channel beam 32. The channel body 33 is formed by welding rectangular steel plates. The channel wall on the maintenance trolley side is welded to the middle of the lower flange of the H-shaped steel channel beam, and the channel wall on the non-maintenance trolley side is welded to the inner side of the vertical edge of the L-shaped angle steel channel beam. The H-shaped channel beam 31 and the L-shaped channel beam 32 are both welded to the secondary beam 12 in the converter station. In order to ensure the same overall channel width, the center distance of the L-shaped angle steel channel beam 32 is slightly larger than that of the H-shaped steel channel beam 31. Therefore, the lengths of the cover plates laid on the channel on the maintenance trolley side and the channel on the non-maintenance trolley side are different. The length of the cover plate on the channel on the side where the maintenance trolley passes is shorter than the cover plate on the channel on the side where the non-maintenance trolley passes.

[0033] like Figure 2 , 3As shown, the channel body 33 is uniformly welded with embedded rectangular steel 51 in the horizontal plane at a certain height from the channel bottom plate. The cooling water inlet pipe 21 and the outlet pipe 22 are respectively fixedly installed on the embedded rectangular steel 51 through fixed supports. The fixed support is composed of a fixed steel bottom plate 52 and a rubber pad 53. The upper end of the fixed steel bottom plate 52 is provided with an arc groove matching the cooling water inlet pipe 21 and the outlet pipe 22. The rubber pad is arranged between the fixed steel bottom plate 52 and the water pipe. The rubber pad is 6 to 8 mm thick. It avoids direct contact between the water pipe and the steel component, solves the problem of vibration of the water pipe and collision with the base during operation, and prolongs the service life of the water pipe. The fixed supports are evenly arranged according to the total weight of the water pipe segment and the bending resistance characteristics.

[0034] like Figure 4-6 As shown, the cover plate includes a cover plate bottom plate 423, a steel grating 421, a reinforcing angle steel 432, a limiting angle steel 431 and a dressing 41. The size of the cover plate is determined by the channel beam 31. The steel grating 421 is welded on the upper surface of the cover plate bottom plate 423, and the dressing 41 is filled in the squares of the steel grating 421. The height of the steel grating is equal to the height of the dressing 41 to ensure the flatness of the cover plate and the valve hall deck. Since the steel grating divides the cover plate into multiple areas, on the one hand, the dressing construction efficiency is improved, and on the other hand, the bending resistance of the cover plate is improved while strengthening the pressure bearing of the dressing.

[0035] A limiting angle steel 431 is welded along the width direction on the lower surface of the cover plate bottom plate 423. The length of the limiting angle steel is less than the net distance of the channel beams on both sides, which ensures the feasibility of the cover plate installation and improves the anti-sliding property of the cover plate to avoid horizontal displacement; a reinforcing angle steel 432 is welded in the length direction of the cover plate bottom plate 423 to ensure the bearing capacity of the cover plate under the dynamic load of the maintenance trolley. The reinforcing angle steel is evenly arranged according to the length of the cover plate to improve the bending bearing capacity of the cover plate. The length of the reinforcing angle steel is equal to the width of the cover plate. The limiting angle steel 431 and the reinforcing angle steel 432 are welded vertically in the plane. After the cooling water pipe and the cover plate are installed, the dressing 41 is constructed together with the valve hall deck dressing and has the same height as the overall dressing of the room. Since the cover plate is installed before the dressing is filled, on the one hand, the overall weight of the cover plate can be reduced and it is easy to install. On the other hand, the dressing is laid integrally with the valve hall deck to ensure the overall flatness. Since the cover plate is combined with the dressing and the steel plate, it can not only ensure the constant temperature and humidity operating environment of the valve hall, but also meet the reliability requirements of the maintenance load.

[0036] like Figure 7 As shown, during the installation stage of the cover plate 4 after the cooling water pipe 2 is installed, temporary lifting ears 6 can be welded on both sides of the cover plate bottom plate for the cover plate with larger blocks, and the cover plate can be laid in place with the help of construction equipment.

[0037] like Figure 8 , 9As shown, in order to consider the needs of later maintenance and operation, a detachable handle 7 is set on the cover plate 4 with a smaller width at the non-maintenance trolley passage position. The detachable handle includes a pre-embedded screw 71, a handle 72 and a bolt 73. The pre-embedded screw 71 is welded on the cover plate bottom plate 423. The two ends of the handle 72 are connected to the pre-embedded screw 71 by bolts 73. The height of the pre-embedded screw is the same as the height of the dressing 41. The dressing block 74 is filled in the cubic boundary around the pre-embedded screw 71. The dressing block 74 is an independent removable dressing. During the non-maintenance period, the cubic area around the pre-embedded screw 71 is filled by an independent dressing block 74, and a screw hole is left in the dressing block 74 to ensure the aesthetics of the floor and the safety of personnel passage. During maintenance, the dressing block 74 is taken out, and a temporary handle 72 is installed at the welding screw, and fixed with bolts 73 to realize the lifting of the cover plate and the maintenance of the channel.

[0038] The above embodiments are only preferred technical solutions of the present invention. Those skilled in the art should understand that the technical solutions or parameters in the embodiments can be modified or replaced without departing from the principle and essence of the present invention, and all should be covered within the protection scope of the present invention.

Claims

1. The cold water channel in the offshore converter station is characterized by: The invention comprises a channel beam, a channel body (33), a side anti-bending plate (34), a bottom anti-bending plate (35) and a cover plate (4); the channel body (33) is a U-shaped channel structure composed of two channel walls and a channel bottom plate; a cooling water inlet pipe (21) and a water outlet pipe (22) are arranged in the channel body; the channel beam is installed on the upper end surfaces of the two channel walls; the cover plate (4) is installed on the channel beam; a one-way water flow hole is provided in the channel bottom plate and a water guide pipe (36) is welded to the outer wall of the channel wall (33); a bottom anti-bending plate (35) is welded to the outer surface of the channel bottom plate; the channel is arranged on both sides of the main structural beam (11) below the deck and intersects the main structural beam (11) perpendicularly; the channel on one side of the main structural beam (11) is a side channel for maintenance vehicles to pass through, and the channel on the other side of the main structural beam (11) is a side channel for non-maintenance vehicles to pass through; The channel beam of the channel on the side where the maintenance trolley passes is an H-shaped steel channel beam (31), and the channel beam of the channel on the side where the non-maintenance trolley passes is an L-shaped angle steel channel beam (32).

2. The cooling water channel in the offshore converter station according to claim 1, characterized in that: The channel body 33 is formed by welding rectangular steel plates. The channel wall of the channel on the maintenance vehicle passage side is welded to the middle of the lower flange of the H-shaped steel channel beam (31), and the channel wall of the channel on the non-maintenance vehicle passage side is welded to the inner side of the vertical edge of the L-shaped angle steel channel beam (32).

3. The cooling water channel in the offshore converter station according to claim 1, characterized in that: An embedded rectangular steel (51) is provided in the channel body (33) at a certain height from the channel bottom plate. The cooling water inlet pipe (21) and the outlet pipe (22) are respectively installed on the embedded rectangular steel (51) through fixed supports. The fixed supports are composed of a fixed steel bottom plate (52) and a rubber pad (53). An arc-shaped groove matching the water pipe is provided at the upper end of the fixed steel bottom plate (52). The rubber pad is provided between the fixed steel bottom plate (52) and the water pipe.

4. The cooling water channel in the offshore converter station according to claim 1, characterized in that: The cover plate comprises a cover plate bottom plate (423), a steel grating (421), a reinforcing angle steel (432), a limiting angle steel (431) and a dressing (41); the steel grating (421) is welded to the upper surface of the cover plate bottom plate (423), and the dressing (41) is filled in the square grids of the steel grating (421); the reinforcing angle steel (432) is welded to the lower surface of the cover plate bottom plate (423); the limiting angle steel (431) and the reinforcing angle steel (432) are welded vertically to each other, and the length of the limiting angle steel (431) is less than the net spacing of the channel beams.

5. The cooling water channel in the offshore converter station according to claim 1, characterized in that: A temporary lifting lug (6) is welded on the bottom plate of the cover plate.

6. The cooling water channel in the offshore converter station according to claim 1, characterized in that: A detachable handle (7) is provided on the cover plate (4) of the non-maintenance trolley passage side channel in the maintenance area.

7. The cooling water channel in the offshore converter station according to claim 6, characterized in that: The detachable handle (7) comprises a pre-embedded screw (71), a handle (72) and a bolt (73); the pre-embedded screw (71) is welded to the cover plate bottom plate 423; and both ends of the handle (72) are detachably connected to the pre-embedded screw (71) by bolts (73).

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