Novel generator stator cooling water cooling device

Abstract

The utility model discloses a novel generator stator cooling water cooling device, which relates to the technical field of generator cooling and comprises a base, a cooler is fixedly mounted at the upper end of the base, a first special-shaped pipe is fixedly mounted at an inlet valve end at one end of the cooler, and a second special-shaped pipe is fixedly mounted at an outlet valve end at one end of the cooler. The upper end of the first special-shaped pipe fixedly communicates with a first connecting pipe, and a bypass valve is fixedly installed at one end of the first connecting pipe. During series operation, secondary cooling can effectively control the inlet and return water temperature of stator cooling water, so that the operation condition of an original stator cooling water cooler is improved, the stator cooling water cooler operates at the temperature lower than that of open water scaling and crystallization, the due cooling effect is exerted, the operation safety and reliability of a stator cooling water system of a No.5 unit in a high-temperature environment can be greatly improved, and the service life of the stator cooling water cooler is prolonged. The fault rate is reduced, safe operation of the generator is guaranteed, and unit operation safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of generator cooling technology, and in particular to a novel generator constant cooling water cooling device. Background Technology

[0002] The stator cooling water cooler of Unit 5 (hereinafter referred to as "stator cooler") is designed as an open-type water cooler. Due to the poor quality of the open-type water, scaling has occurred on the cooling water side many times over the years. For example, after non-destructive cleaning during the shutdown maintenance in 2023, hardened scaling occurred only 92 days after the unit was put into operation. When the load of the unit reached 1049MW during the peak summer season, the stator cooling water inlet temperature reached a maximum of 52.1℃ (the stator cooling water inlet temperature setting of Unit 5 generator is: 53℃ high alarm, 58℃ trip). Forced online switching and cleaning are necessary; it is evident that during this period, the generator's heat output increases significantly due to the rising ambient temperature, exceeding that of other seasons. At full load, the generator's cooling water outlet temperature often reaches above 65℃, meaning the stator inlet water is 65℃~70℃. Under these temperature conditions, scaling on the cooling water side of the stator plates intensifies, rapidly creating a vicious cycle that directly leads to an increase in the generator inlet temperature, even exceeding limits, seriously threatening the generator's safe operation. Furthermore, due to the nature of the scale crystals, after the cooler is dismantled on-site, there are no conditions for non-destructive cleaning, which can easily cause perforation and damage to the plates and breakage of the sealing strips, reducing the unit's operational economy. Switching the stator unit during the peak summer season poses a significant safety risk. Utility Model Content

[0003] The purpose of this invention is to solve the problem in the existing technology that directly leads to the generator inlet temperature rising or even exceeding the limit, seriously threatening the safe operation of the generator, and to propose a new type of generator constant cooling water cooling device.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a novel cooling device for generator constant cooling water, comprising a base, a cooler fixedly installed on the upper end of the base, a first shaped pipe fixedly installed at the inlet valve end of one end of the cooler, a second shaped pipe fixedly installed at the outlet valve end of one end of the cooler, a first connecting pipe fixedly connected to the upper end of the first shaped pipe, a bypass valve fixedly installed at one end of the first connecting pipe, a second connecting pipe fixedly connected to the upper end of the second shaped pipe, and one end of the second connecting pipe fixedly connected to the other end of the bypass valve.

[0005] Preferably, a first protective plate is provided at the upper end of the base, a connecting plate is fixedly installed at one end of the base, and a second protective plate is provided at the upper end of the connecting plate.

[0006] Preferably, one end of the cooler is fixedly connected to a No. 3 shaped tube, and the other end of the cooler is fixedly connected to a No. 4 shaped tube.

[0007] Preferably, two sets of concave seats are fixedly installed on the upper ends of the base and the connecting plate, and convex blocks are slidably inserted into the interior of the four sets of concave seats.

[0008] Preferably, one end of both the first and second protective plates has multiple sets of heat dissipation holes.

[0009] Preferably, the protruding ends of both sets of convex blocks are fixed to the inner wall of the first protective plate.

[0010] Preferably, the protruding ends of the other two sets of convex blocks are fixed to the inner wall of the second protective plate.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0012] 1. In this utility model, when the series operation is carried out, the two-stage cooling can effectively control the inlet and outlet temperatures of the stator cooling water, thereby improving the original operating conditions of the stator cooling water cooler, so that it operates at a temperature lower than that of open water scaling and crystallization, and exerts the due cooling effect. This can greatly improve the operational safety and reliability of the No. 5 unit's stator cooling water system under high temperature environment, reduce the failure rate, ensure the safe operation of the generator, and thus improve the operational safety of the unit.

[0013] 2. In this utility model, the cost of this modification is relatively low. After the modification, the cost of unplanned cooler maintenance and cleaning can be reduced, the aging rate of plate seals can be reduced, and the economic efficiency of unit operation can be improved. Attached Figure Description

[0014] Figure 1 This utility model presents a structural schematic diagram of a novel generator constant cooling water cooling device;

[0015] Figure 2 A partial perspective view of a novel cooling device for generator constant cooling water is provided for this utility model.

[0016] Figure 3 A top view of a novel generator cooling water cooling device is provided for this utility model;

[0017] Figure 4 This utility model presents a schematic diagram of the structure of the first and second protective plates in a novel generator constant cooling water cooling device.

[0018] Legend: 1. Base; 2. Cooler; 3. Shaped tube No. 1; 4. Shaped tube No. 2; 5. Connecting pipe No. 1; 6. Bypass valve; 7. Connecting pipe No. 2; 8. Shaped tube No. 3; 9. Shaped tube No. 4; 10. Convex block; 11. Protective plate No. 1; 12. Connecting plate; 13. Protective plate No. 2; 14. Concave seat; 15. Heat dissipation hole. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0021] Example 1: As Figure 1 - Figure 4 As shown, this utility model provides a novel cooling device for generator constant cooling water, including a base 1, a cooler 2 fixedly installed on the upper end of the base 1, a first-shaped pipe 3 fixedly installed at the inlet valve end of one end of the cooler 2, a second-shaped pipe 4 fixedly installed at the outlet valve end of one end of the cooler 2, a first-connecting pipe 5 fixedly connected to the upper end of the first-shaped pipe 3, a bypass valve 6 fixedly installed at one end of the first-connecting pipe 5, a second-connecting pipe 7 fixedly connected to the upper end of the second-shaped pipe 4, one end of the second-connecting pipe 7 being fixed to the other end of the bypass valve 6, a third-shaped pipe 8 fixedly connected to one end of the cooler 2, and a fourth-shaped pipe 9 fixedly connected to one end of the cooler 2.

[0022] The specific settings and functions of this embodiment are described below. In order to solve the periodic problem of scaling in the stator of Unit 5 during the high-temperature season, based on the site survey and thorough research, it is recommended to add a set of pre-coolers 2 below the stator water return pipe and the closed water inlet and return header at the 0-meter level. Connect the No. 1 connecting pipe 5 and the No. 2 connecting pipe 7 in parallel to the stator water pipe, and install the corresponding bypass valve 6 and the inlet and outlet valves of the pre-cooler 2. When the pre-cooler 2 is put into operation, it will operate in series with the original cooler body.

[0023] Cooler 2 adopts an Alfa Laval plate cooler, designed with a constant cooling water inlet flow rate of 125t / h, a closed-loop cooling water flow rate of 80t / h, and a constant cooling water outlet temperature that is 10-15℃ lower than the outlet temperature. Taking advantage of the clean and scale-free characteristics of closed-loop water, it undertakes the first-stage cooling function of constant cooling water and is used to improve the inlet temperature of the constant cooling water side of the original cooler under high-temperature conditions, controlling it below 60℃.

[0024] When operating in series, the two-stage cooling system can effectively control the inlet and outlet temperatures of the stator cooling water, thereby improving the operating conditions of the original stator cooling water cooler. This allows it to operate at a temperature lower than that of open-loop water where scaling and crystallization occur, thus achieving the desired cooling effect. This can greatly improve the operational safety and reliability of the No. 5 unit's stator cooling water system under high-temperature conditions, reduce the failure rate, ensure the safe operation of the generator, and ultimately improve the overall operational safety of the unit.

[0025] The cost of this renovation is relatively low. After the renovation, the maintenance and cleaning costs of the unplanned cooler 2 can be reduced, the aging rate of the plate seals can be reduced, and the economic efficiency of the unit operation can be improved.

[0026] Utilizing the 80t / h margin of the closed-loop water system of Unit 5, the system still has a margin of 43.3t / h. Calculations show that this is within the cooling flow range of the closed-loop cooling water cooler 2 (i.e., the total flow of the closed-loop water after the modification is about 1121.7t / h, which is less than the maximum flow of a single closed-loop water pump of 1165t / h and less than the total flow of the closed-loop cooler of 1376t / h).

[0027] Example 2: Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a first protective plate 11 is provided at the upper end of the base 1, a connecting plate 12 is fixedly installed at one end of the base 1, a second protective plate 13 is provided at the upper end of the connecting plate 12, two sets of concave seats 14 are fixedly installed at the upper ends of both the base 1 and the connecting plate 12, and convex blocks 10 are slidably inserted into the interior of the four sets of concave seats 14. Multiple sets of heat dissipation holes 15 are opened through one end of the first protective plate 11 and the second protective plate 13, and the protruding ends of the two sets of convex blocks 10 are fixed to the inner wall of the first protective plate 11, and the protruding ends of the other two sets of convex blocks 10 are fixed to the inner wall of the second protective plate 13.

[0028] The overall effect of this embodiment is that, with the cooperation of the first protective plate 11 and the second protective plate 13, the entire cooler 2 and the parts of the first shaped tube 3, the second shaped tube 4, the third shaped tube 8 and the fourth shaped tube 9 can be protected, preventing the cooler 2 and the first shaped tube 3, the second shaped tube 4, the third shaped tube 8 and the fourth shaped tube 9 from being damaged. Furthermore, by opening multiple sets of heat dissipation holes 15 through one end of the first protective plate 11 and the second protective plate 13, and by designing the upper openings of the first protective plate 11 and the second protective plate 13, the heat dissipation of the cooler 2 can be improved.

[0029] The usage and working principle of this device are as follows: First, add a pre-cooler 2 below the 0-meter level constant cooling water return pipe and the closed-loop water inlet and return header. Connect the No. 1 connecting pipe 5 and the No. 2 connecting pipe 7 in parallel to the constant cooling water pipe. Install the corresponding bypass valve 6 and the inlet and outlet valves of the cooler 2. When the pre-cooler 2 is put into operation, it will run in series with the original cooler body. Then, utilize the 80t / h margin of the No. 5 unit's closed-loop water system. The system still has a margin of 43.3t / h. According to calculations, it is within the cooling flow range of the closed-loop cooling water cooler 2 (that is, the total flow of the closed-loop water after the modification is about 1121.7t / h, which is less than the maximum flow of a single closed-loop water pump of 1165t / h and less than the total flow of the closed-loop cooler of 1376t / h).

[0030] The above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the technical solution of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A novel cooling device for generator constant cooling water, comprising a base (1), characterized in that: A cooler (2) is fixedly installed on the upper end of the base (1). A first-shaped pipe (3) is fixedly installed on the inlet valve end of one end of the cooler (2). A second-shaped pipe (4) is fixedly installed on the outlet valve end of one end of the cooler (2). A first-connecting pipe (5) is fixedly connected to the upper end of the first-shaped pipe (3). A bypass valve (6) is fixedly installed on one end of the first-connecting pipe (5). A second-connecting pipe (7) is fixedly connected to the upper end of the second-shaped pipe (4). One end of the second-connecting pipe (7) is fixed to the other end of the bypass valve (6).

2. The novel generator constant cooling water cooling device according to claim 1, characterized in that: The upper end of the base (1) is provided with a first protective plate (11), and a connecting plate (12) is fixedly installed at one end of the base (1). The upper end of the connecting plate (12) is provided with a second protective plate (13).

3. The novel generator constant cooling water cooling device according to claim 1, characterized in that: One end of the cooler (2) is fixedly connected to the No. 3 shaped tube (8), and the other end of the cooler (2) is fixedly connected to the No. 4 shaped tube (9).

4. The novel generator constant cooling water cooling device according to claim 2, characterized in that: Two sets of concave seats (14) are fixedly installed on the upper ends of the base (1) and the connecting plate (12), and convex blocks (10) are slidably inserted inside the four sets of concave seats (14).

5. The novel generator constant cooling water cooling device according to claim 4, characterized in that: Multiple sets of heat dissipation holes (15) are opened through one end of the first protective plate (11) and the second protective plate (13).

6. The novel generator constant cooling water cooling device according to claim 5, characterized in that: The protruding ends of both sets of convex blocks (10) are fixed to the inner wall of the first protective plate (11).

7. The novel generator constant cooling water cooling device according to claim 6, characterized in that: The protruding ends of the other two sets of convex blocks (10) are fixed to the inner wall of the second protective plate (13).

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