Arrangement of a recirculating cooling water system

Abstract

This utility model relates to the field of circulating cooling water technology and discloses an arrangement structure of a circulating cooling water system, including a first cooling tower row and a second cooling tower row arranged at intervals; a circulating water pump station is set at the interval between the first cooling tower row and the second cooling tower row, and a vertical diagonal flow pump is installed in the circulating water pump station, and a water suction pool is set at the bottom of the circulating water pump station; a structural column is set at the end of the first cooling tower row and the second cooling tower row facing the circulating water pump station, and a maintenance lifting device for hoisting the equipment of the circulating water pump station is installed on the structural column. This optimizes the spatial layout, improves the space utilization rate of the circulating cooling water system, and uses the existing structural columns at both ends of the long axis of the cooling tower row as the support points of the lifting track. The top elevation of the first and second cooling tower water collection pools and the pump station water suction pool is reduced to be level with the ground, thereby reducing the overall elevation of the circulating cooling water system.

Description

Technical Field

[0001] This utility model relates to the field of circulating cooling water technology, and in particular to an arrangement structure of a circulating cooling water system. Background Technology

[0002] The circulating cooling water system of a gas-steam combined cycle generator unit is a key component in ensuring the safe and efficient operation of the unit. Its layout directly affects the land use efficiency and operation and maintenance costs of the project. Taking two 9F-class gas-steam combined cycle generator units as an example, the circulating cooling water system of each unit includes a cooling tower duct, a cooling tower water collection pool, and a circulating water pump station (built together for both units).

[0003] In existing technical solutions, circulating water pump rooms (stations) are generally located outside the cooling tower rows. A space of no less than four times the height of the cooling tower air inlet needs to be reserved between the two rows of towers to meet the ventilation spacing requirements. No other facilities can be installed, resulting in low space utilization. Furthermore, in the existing technical solution, the circulating water pump is a horizontal centrifugal pump arranged in the open ground, with the cooling tower water collection pool serving as the suction pool for the circulating water pump. The horizontal centrifugal pump draws water from the cooling tower water collection pool, pressurizes it, and then delivers it to the main plant for cooling the condenser and water-to-water heat exchanger. Considering the positive pressure suction of the horizontal centrifugal pump and the necessary net positive suction head (NPSH) of the pump, the cooling tower and cooling tower water collection pool need to be raised as a whole. In actual projects, the circulating cooling water volume is increasing, the flow rate of a single circulating water pump is increasing, and the installation height of the pump is also increasing accordingly. When the circulating water pump is installed on the ground, the overall height of the cooling tower and cooling tower water collection pool needs to be increased to 4m to 5m above the ground, which is neither economical nor aesthetically pleasing. In addition, when maintenance work is required on the circulating water pump station in the existing technical solution, mobile lifting equipment needs to be called in to lift the equipment of the circulating water pump station, resulting in a long maintenance cycle. Utility Model Content

[0004] The technical problem this utility model aims to solve is that: a space of no less than four times the height of the cooling tower air inlet needs to be reserved between the two rows of towers to meet ventilation spacing requirements, making it impossible to install other facilities, resulting in low space utilization; furthermore, the circulating water pump is a horizontal centrifugal pump arranged in the open ground, and the cooling tower water collection pool serves as the suction pool for the circulating water pump. Considering the positive pressure suction of the horizontal centrifugal pump and the necessary net positive suction head of the pump, the overall height of the cooling tower and cooling tower water collection pool needs to be increased to 4m to 5m above the ground, which is neither economical nor aesthetically pleasing; in the existing solution, when maintenance work is required on the circulating water pump station, mobile lifting equipment needs to be called to lift the equipment of the circulating water pump station, resulting in a long maintenance cycle.

[0005] To solve the above-mentioned technical problems, this utility model provides an arrangement structure for a circulating cooling water system, including a first cooling tower row and a second cooling tower row arranged at intervals.

[0006] The first cooling tower has a first cooling tower water collection pool at the bottom of the tower bar, and the second cooling tower has a second cooling tower water collection pool at the bottom of the tower bar.

[0007] A circulating water pump station is installed at the interval between the first cooling tower column and the second cooling tower column. The circulating water pump station is equipped with a vertical diagonal flow pump. A pump station suction pool is located at the bottom of the circulating water pump station. The motor of the vertical diagonal flow pump is located on the ground, and the pump body of the vertical diagonal flow pump extends below the liquid surface of the pump station suction pool.

[0008] The pump station's suction pool is connected to a return water ditch, and the other end of the return water ditch is connected to the first cooling tower's water collection pool and the second cooling tower's water collection pool.

[0009] The tops of the first cooling tower water collection pool, the second cooling tower water collection pool, and the pump station suction pool are all level with the ground level.

[0010] Both the first and second cooling tower columns have structural columns at the ends facing the circulating water pump station, and maintenance lifting devices for hoisting equipment of the circulating water pump station are installed on the structural columns.

[0011] Preferably, the installation height of the maintenance lifting device is higher than the air inlet height of the first and second cooling tower columns.

[0012] Preferably, the maintenance lifting device is an electric double-girder bridge crane. Support brackets are provided on the structural columns of the first cooling tower row and the second cooling tower row. Lifting rails are provided at both ends of the electric double-girder bridge crane, and each lifting rail is installed on each support bracket.

[0013] Preferably, with the ground as the reference, the top of the first cooling tower water collection pool is 0.0m high, and the bottom of the pool is 2.3m below the ground.

[0014] The top of the second cooling tower's water collection pool is 0.0m high, and the bottom of the pool is 2.3m below the ground.

[0015] Preferably, with the ground as the reference, the top of the pump station's suction pool is 0.0m high, and the bottom is 7.3m below the ground.

[0016] Preferably, the circulating water pump station is located on one side of the area between the first cooling tower row and the second cooling tower row.

[0017] Preferably, a maintenance area is provided at one end of the interval between the circulating water pump station and the first cooling tower column and the second cooling tower column.

[0018] Preferably, the end of the maintenance site is flush with the ends of the first cooling tower column and the second cooling tower column.

[0019] Compared with the prior art, the arrangement structure of the circulating cooling water system of this utility model has the following advantages:

[0020] The circulating cooling water system layout structure provided in this embodiment optimizes the spatial layout and improves the space utilization rate of the circulating cooling water system by setting the circulating water pump station between the first and second cooling tower rows. Furthermore, because the circulating water pump station of this application is located at the interval between the two cooling tower rows, the existing structural columns at both ends of the long axis of the cooling tower rows can be used as the lifting rail load-bearing structure of the electric double girder bridge crane. There is no need to set up an additional support structure for the crane rail installation, saving engineering investment. The electric double girder bridge crane can carry out hoisting operations on all the equipment of the circulating water pump station by moving on the lifting rail, without the need to call up mobile hoisting facilities, which improves the convenience and stability of maintenance operations.

[0021] Furthermore, this application uses a vertical mixed-flow pump instead of a horizontal centrifugal pump. The motor of the vertical mixed-flow pump is installed on the ground, and the pump body is immersed below the liquid surface of the pump station's suction pool. The pump inlet has sufficient submersion depth, so that the top height of the first and second cooling tower water collection pools and the pump station's suction pool are all level with the ground. This avoids the problem in the existing technical solution that the cooling tower water collection pool needs to be raised by 4m to 5m to meet the necessary net positive suction head (NPSH) requirement of the pump. It significantly reduces the overall elevation of the circulating cooling water system, which is both economical and aesthetically pleasing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the layout structure of the circulating cooling water system provided in this embodiment of the utility model;

[0023] Figure 2 This is a cross-sectional view of the layout structure of the circulating cooling water system provided in this embodiment of the utility model;

[0024] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0025] In the diagram, 1. First cooling tower row; 2. Second cooling tower row; 3. First cooling tower water collection tank; 4. Second cooling tower water collection tank; 5. Circulating water pump station; 6. Vertical mixed flow pump; 61. Motor; 62. Pump body; 7. Pump station suction tank; 8. Return water ditch; 9. Electric double girder bridge crane; 10. Structural column; 11. Support bracket; 12. Lifting rail; 13. Maintenance area. Detailed Implementation

[0026] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0027] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] It should be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be called "second" information, and similarly, "second" information can also be called "first" information.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] like Figures 1 to 3 As shown in the figure, a preferred embodiment of the present invention provides an arrangement structure for a circulating cooling water system, including a first cooling tower row 1 and a second cooling tower row 2 arranged at intervals; a first cooling tower water collection pool 3 is provided at the bottom of the first cooling tower row 1, and a second cooling tower water collection pool 4 is provided at the bottom of the second cooling tower row 2. The first cooling tower water collection pool and the second cooling tower water collection pool are respectively used to collect the cooling water that falls after being cooled by the first cooling tower row 1 and the second cooling tower row 2; a circulating water pump station 5 is provided at the interval between the first cooling tower row 1 and the second cooling tower row 2, and the circulating water pump station 5 is equipped with a vertical diagonal flow pump 6, which circulates water... Pump station 5 has a pump station suction pool 7 at its bottom. The motor 61 of the vertical mixed-flow pump 6 is installed on the ground, and the pump body 62 of the vertical mixed-flow pump 6 extends below the liquid surface of the pump station suction pool 7. The pump station suction pool 7 is connected to a return water ditch 8, and the other end of the return water ditch 8 is connected to the first cooling tower collection pool 3 and the second cooling tower collection pool 4. The pump body 62 of the vertical mixed-flow pump 6 is used to draw water from the pump station suction pool 7. After being pressurized by the motor 61, the circulating cooling water is delivered to the main plant for cooling the condenser and water-to-water heat exchanger. The motor 61 is installed on the ground pump base and connected to the pump shaft through a coupling, which facilitates the maintenance of the motor 61 by the operator.

[0031] The tops of the first cooling tower water collection pool 3, the second cooling tower water collection pool 4, and the pump station suction pool 7 are all level with the ground level; the first cooling tower tower 1 and the second cooling tower tower 2 are each provided with a structural column 10 at one end facing the circulating water pump station 5, and the structural column 10 is equipped with a maintenance lifting device for hoisting all the equipment of the circulating water pump station 5.

[0032] By placing the circulating water pump station 5 between the first and second cooling tower rows 2, the spatial layout is optimized, and the space utilization rate of the circulating cooling water system is improved. Furthermore, because the circulating water pump station 5 of this application is located between the two cooling tower rows, the existing structural columns 10 at both ends of the long axis of the cooling tower rows can be used as the support points for the lifting rails 12, eliminating the need for additional load-bearing structures. In addition, this application uses a vertical diagonal flow pump 6 instead of a horizontal centrifugal pump. The motor 61 of the vertical diagonal flow pump 6 is installed on the ground, and the pump body 62 of the vertical diagonal flow pump 6 is immersed below the liquid surface of the pump station suction pool 7. The pump inlet has sufficient submersion depth, so that the top height of the first and second cooling tower collection pools 4 and the pump station suction pool 7 are all flush with the ground. This avoids the problem in the prior art that the collection pool needs to be raised by 4m to 5m to meet the required net positive suction head (NPSH) of the pump. This significantly reduces the overall elevation of the circulating cooling water system, making it both economical and aesthetically pleasing.

[0033] Specifically, the installation height of the maintenance lifting device is higher than the air inlet height of the first cooling tower row 1 and the second cooling tower row 2. The installation height of the maintenance lifting device is located above the air inlet to avoid the maintenance lifting device blocking or interfering with the air inlet channel of the cooling tower and to ensure smooth air circulation.

[0034] The maintenance lifting device is an electric double-girder bridge crane 9. Support brackets 11 are provided on the structural columns 10 of the first cooling tower tower 1 and the second cooling tower tower 2. Lifting rails 12 are provided at both ends of the electric double-girder bridge crane 9. Each lifting rail 12 is installed on each support bracket 11. The lifting rails 12 are installed based on the high-strength structural columns 10. Combined with the bending and shear resistance of the support brackets 11, the structural strength of the rail system is significantly improved.

[0035] Specifically, the first cooling tower row 1 and the second cooling tower row 2 are arranged in parallel and spaced apart. The structural columns 10 of the two rows form a stable and symmetrical support structure in the long axis direction to ensure the smooth operation of the electric double girder crane 9.

[0036] Specifically, with the ground as the reference, the top of the first cooling tower water collection pool 3 is 0.0m high and the bottom is 2.3m below the ground; the top of the second cooling tower water collection pool 4 is 0.0m high and the bottom is 2.3m below the ground; the depth of the first cooling tower water collection pool 3 and the second cooling tower water collection pool 4 meets the requirements for collecting cooling water while avoiding increased structural costs due to excessive bottom depth.

[0037] Specifically, with the ground as the reference, the top of the pump station's suction pool 7 is 0.0m high, and the bottom of the pool is 7.3m below the ground, thus providing sufficient effective water depth for the vertical mixed-flow pump 6 and meeting the submersion depth requirements of the suction inlet of the vertical mixed-flow pump 6.

[0038] Specifically, the circulating water pump station 5 is located on one side of the area between the first cooling tower bar 1 and the second cooling tower bar 2, such as... Figure 1 As shown, the major axis of the circulating cooling water system is defined as having axes ①, ②, ③, ④, ⑤, ⑥, ⑦, ⑧, ⑨, and ⑩ from top to bottom. axis, shaft and The axis, defined as the minor axis of the circulating cooling water system, has a direction from left to right. axis, axis, axis, axis, shaft and The circulating water pump station 5 is located along the long axis of the circulating cooling water system, from axis ① to axis ⑤, and along the short axis of the circulating cooling water system. Axis to The distance between the axes shortens the access path for equipment within the circulating water pump station 5.

[0039] Specifically, a maintenance area 13 is provided at one end of the interval between the circulating water pump station 5 and the first cooling tower bar 1 and the second cooling tower bar 2. The maintenance area 13 connects to the factory road, such as... Figure 1 As shown, maintenance site 13 is located at the intersection of axis ① to axis ② in the long axis direction of the circulating cooling water system and the short axis direction of the circulating cooling water system. Axis to Between the shafts, the maintenance site 13 is set at the outer end of the circulating water pump station 5, so that when the circulating water pump station 5 is being maintained, the equipment inside the circulating water pump station 5 can be temporarily placed in the maintenance site 13. The maintenance site 13 is connected to the factory road, which facilitates the transfer of equipment through the factory road.

[0040] Specifically, such as Figure 1 As shown, axes ① to ⑤ in the long axis direction of the circulating cooling water system intersect with the short axis direction of the circulating cooling water system. Axis to The area between the shafts is the lifting range of the maintenance lifting device, and the maintenance site 13 is located within the lifting range of the maintenance lifting device.

[0041] Specifically, the end of the maintenance area 13 is flush with the ends of the first cooling tower row 1 and the second cooling tower row 2 to avoid wasting local space due to misalignment.

[0042] In other embodiments,

[0043] The working process of this utility model is as follows: When the circulating cooling water system is running, the cooling water in the first and second cooling tower columns is cooled by the packing layer and falls into the first and second cooling tower collection pools at the bottom, respectively. The water flows to the circulating water front pool through the return water ditch. The pump body of the vertical mixed-flow pump is immersed in the pump station suction pool. The water depth of the suction pool meets the suction submersion depth of the vertical mixed-flow pump to avoid cavitation. The motor of the vertical mixed-flow pump is installed on the ground pump base. After pressurizing the pump body, it delivers the circulating water to the main plant for cooling the condenser and water-to-water heat exchanger. During maintenance, the electric double-girder bridge crane moves along the lifting rails on the cooling tower column structure. The movement range of the electric double-girder bridge crane covers the intersection of axis ① to axis ⑤ in the long axis direction of the circulating cooling water system and the short axis direction of the circulating cooling water system. Axis to The shaft area allows all components requiring maintenance to be hoisted to the maintenance site and transported via factory roads.

[0044] In summary, this utility model embodiment provides a circulating cooling water system layout structure. By setting the circulating water pump station between the first and second cooling tower rows, the spatial layout is optimized, and the space utilization rate of the circulating cooling water system is improved. Furthermore, because the circulating water pump station of this application is located at the interval between the two cooling tower rows, the existing structural columns at both ends of the long axis of the cooling tower rows can be used as the lifting rail load-bearing structure of the electric double girder bridge crane. There is no need to set up an additional support structure for the crane rail installation, saving engineering investment. The electric double girder bridge crane can perform hoisting operations on all the equipment of the circulating water pump station by moving on the lifting rail, without the need to call up mobile hoisting facilities, thus improving the convenience of maintenance operations.

[0045] Furthermore, this application uses a vertical mixed-flow pump instead of a horizontal centrifugal pump. The motor of the vertical mixed-flow pump is installed on the ground, and the pump body is immersed below the liquid surface of the circulating water suction pool. The pump inlet has sufficient submersion depth, so that the top height of the first and second cooling tower water collection pools and the pump station suction pool are all level with the ground. This avoids the problem in the existing technical solution that the water collection pool needs to be raised by 4m to 5m to meet the required net positive suction head (NPSH) of the pump. It significantly reduces the overall elevation of the circulating cooling water system, which is both economical and aesthetically pleasing.

[0046] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. An arrangement of a recirculating cooling water system, characterized in that, It includes a first cooling tower row (1) and a second cooling tower row (2) arranged at intervals; The first cooling tower column (1) is provided with a first cooling tower water collection pool (3) at the bottom, and the second cooling tower column (2) is provided with a second cooling tower water collection pool (4) at the bottom; A circulating water pump station (5) is provided at the interval between the first cooling tower bar (1) and the second cooling tower bar (2). The circulating water pump station (5) is equipped with a vertical diagonal flow pump (6). The bottom of the circulating water pump station (5) is equipped with a pump station suction pool (7). The motor (61) of the vertical diagonal flow pump (6) is located on the ground. The pump body (62) of the vertical diagonal flow pump (6) extends into the liquid surface of the pump station suction pool (7). The pump station's suction pool (7) is connected to a return water ditch (8), and the other end of the return water ditch (8) is connected to the first cooling tower water collection pool (3) and the second cooling tower water collection pool (4). The tops of the first cooling tower water collection pool (3), the second cooling tower water collection pool (4), and the pump station water intake pool (7) are all level with the ground level; Both the first cooling tower column (1) and the second cooling tower column (2) are provided with structural columns (10) at one end facing the circulating water pump station (5). The structural columns (10) are equipped with maintenance lifting devices for hoisting the equipment of the circulating water pump station (5).

2. An arrangement of a recirculating cooling water system according to claim 1, characterized in that The installation height of the maintenance lifting device is higher than the air inlet height of the first cooling tower column (1) and the second cooling tower column (2).

3. An arrangement of a recirculating cooling water system according to claim 2, characterized in that The maintenance lifting device is an electric double girder bridge crane (9). Support brackets (11) are provided on the structural columns (10) of the first cooling tower row (1) and the second cooling tower row (2). Lifting rails (12) are provided at both ends of the electric double girder bridge crane (9). Each lifting rail (12) is installed on each support bracket (11).

4. An arrangement of a recirculating cooling water system according to claim 1, characterized in that With the ground as a reference, the top of the first cooling tower water collection pool is 0.0m high, and the bottom of the pool is 2.3m below the ground. The top of the second cooling tower water collection pool (4) is 0.0m high, and the bottom of the pool is 2.3m below the ground.

5. An arrangement for a recirculating cooling water system according to claim 4, c h a r a c t e r i s e d i n that With the ground as the reference, the top of the pump station's suction pool (7) is 0.0m high, and the bottom of the pool is 7.3m below the ground.

6. An arrangement of a recirculating cooling water system according to claim 1, characterized in that The circulating water pump station (5) is located on one side of the area between the first cooling tower bar (1) and the second cooling tower bar (2).

7. An arrangement of a recirculating cooling water system according to claim 6, characterized in that A maintenance area (13) is provided between the circulating water pump station (5) and one end of the interval between the first cooling tower column (1) and the second cooling tower column (2).

8. An arrangement of a recirculating cooling water system according to claim 7, characterized in that The end of the maintenance site (13) is flush with the ends of the first cooling tower column (1) and the second cooling tower column (2).

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