Water quality control system for internal cooling of a generator

Abstract

The utility model discloses a generator internal cooling water quality control system relates to generator control technical field, include: desalted water pipe, the ammonia -containing before water outlet pipe of fine treatment mixed bed export mother pipe and the ammonia -containing after water outlet pipe, programmable logic controller and conductance cell, desalted water pipe and ammonia -containing before water outlet pipe parallel connection after with mixed inlet pipe connection, and the ammonia -containing after water outlet pipe together access internal cooling water inlet pipe, and internal cooling water inlet pipe access generator internal cooling water tank, and the sampling pipeline is connected on internal cooling water inlet pipe, and the conductance cell is set up on sampling pipeline, and the ammonia -containing before water replenishment electric valve is set up on mixed inlet pipe, and the ammonia -containing after water replenishment electric valve is set up on the ammonia -containing after water outlet pipe, and the conductance cell, ammonia -containing before water replenishment electric valve and ammonia -containing after water replenishment electric valve all are electrically connected with programmable logic controller. The utility model has alleviated the technical problem that present technical existence's operation cycle is short and the big technical problem of operation workload.

Description

Technical Field

[0001] This utility model relates to the field of generator control technology, specifically to a generator internal cooling water quality control system. Background Technology

[0002] Traditional generator internal cooling water treatment uses a combination of bypass small mixed bed and trace alkali addition. A bypass small mixed bed is set up in the internal cooling water circulation system to treat part of the internal cooling water, and an appropriate amount of NaOH is added to the internal cooling water to increase the pH value, which can reduce the conductivity and copper ion content of the internal cooling water.

[0003] However, the above solution has the following problems: due to the incomplete sealing of the generator's internal cooling water tank, O2 and CO2 in the air will dissolve into the internal cooling water. The operation of the alkali addition device is sometimes unstable, which will cause the pH value of the internal cooling water to be too low and unqualified, which will cause corrosion of the generator's hollow copper wires. In addition, the added NaOH will also increase the salt content in the water. These factors will greatly shorten the operating cycle of the small mixed bed. Therefore, it is necessary to replace the relatively expensive special resin for the small mixed bed of internal cooling water every year. The manual preparation of alkali solution will also increase the workload of the operators, increase the operating cost and maintenance difficulty. Utility Model Content

[0004] The purpose of this utility model is to provide a generator internal cooling water quality control system in order to solve at least one of the above-mentioned technical problems.

[0005] In a first aspect, this utility model provides a generator internal cooling water quality control system, comprising: a demineralized water pipe, a pre-ammonia-addition water outlet pipe and a post-ammonia-addition water outlet pipe of a fine-treatment mixed bed outlet header, a programmable logic controller, and a conductivity cell; the demineralized water pipe and the pre-ammonia-addition water outlet pipe are connected in parallel and then connected to a mixed water inlet pipe; the mixed water inlet pipe and the post-ammonia-addition water outlet pipe are connected together to an internal cooling water inlet pipe, which is connected to the generator internal cooling water tank; a sampling pipeline is connected to the internal cooling water inlet pipe, wherein... The conductivity cell is installed on the sampling pipeline; an electric valve for replenishing water before ammonia addition is installed on the mixed water inlet pipe, and an electric valve for replenishing water after ammonia addition is installed on the water outlet pipe after ammonia addition; the conductivity cell, the electric valve for replenishing water before ammonia addition, and the electric valve for replenishing water after ammonia addition are all electrically connected to the programmable logic controller; the conductivity cell is used to monitor the conductivity of the replenished water in the internal cooling water inlet pipe; the programmable logic controller is used to control the on / off state of the electric valve for replenishing water before ammonia addition and the electric valve for replenishing water after ammonia addition.

[0006] Furthermore, filters are respectively installed on the pre-ammonia water outlet pipe, the post-ammonia water outlet pipe, and the internal cooling water inlet pipe.

[0007] Furthermore, the outlet of the generator's internal cooling water tank is connected to an intermediate water tank.

[0008] Furthermore, the outlet of the sampling pipeline is connected to the intermediate water tank, and the outlet of the intermediate water tank is connected to the steam side of the condenser.

[0009] Furthermore, multiple overflow valves are installed between the outlet of the generator's internal cooling water tank and the intermediate water tank.

[0010] Furthermore, a sampling flow meter is also installed on the sampling pipeline to monitor the sampling water flow rate on the sampling pipeline.

[0011] Furthermore, a water replenishment bypass is also provided on the internal cooling water inlet pipe, and a water replenishment flow meter and a bypass electric valve are provided on the water replenishment bypass. A water replenishment ball valve is provided on the internal cooling water inlet pipe, and the water replenishment ball valve is connected in parallel with the water replenishment bypass. The water replenishment flow meter and the bypass electric valve are both electrically connected to the programmable logic controller. The water replenishment flow meter is used to monitor the water replenishment flow in the water replenishment bypass.

[0012] Furthermore, a sampling flow rate adjustment valve is also provided on the sampling pipeline to control the sampling water flow rate in the sampling pipeline.

[0013] Furthermore, pressure gauge valves are respectively installed on the water outlet pipe before ammonia addition and the water outlet pipe after ammonia addition.

[0014] This invention provides a generator internal cooling water quality control system. The system uses the water replenishment conductivity as the control signal for a programmable logic controller (PLC) to control the water replenishment volume of the demineralized water pipe, the pre-ammonia-addition outlet pipe, and the post-ammonia-addition outlet pipe. It controls the conductivity of the mixed water within a preset range and maintains the pH within the system within a normal range through continuous water replenishment. Continuous water replenishment increases the condensate tank level. By connecting an intermediate water tank to the generator internal cooling water tank, the internal cooling water exceeding the set value overflows into the intermediate water tank and is then recovered to the condenser, achieving a dynamic balance between automatic water replenishment and automatic recovery. This alleviates the technical problems of short operating cycles and high workload in existing technologies. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a generator internal cooling water quality control system provided for an embodiment of the present utility model.

[0017] In the diagram: 1. Demineralized water pipe, 2. Ammonia-adding outlet pipe, 3. Ammonia-adding outlet pipe, 4. Programmable logic controller, 5. Conductivity cell, 6. Mixing inlet pipe, 7. Internal cooling water inlet pipe, 8. Generator internal cooling water tank, 9. Sampling pipeline, 10. Ammonia-adding pre-fill water electric valve, 11. Ammonia-adding post-fill water electric valve, 12. Filter, 13. Intermediate water tank, 14. Overflow valve, 15. Sampling flow meter, 16. Makeup water flow meter, 17. Bypass electric valve, 18. Makeup water ball valve, 19. Sampling flow adjustment valve, 20. Pressure gauge valve, 21. Check valve, 22. Manual ball valve, 23. Bypass ball valve, 24. Outlet valve. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Figure 1 This is a schematic diagram of a generator internal cooling water quality control system according to an embodiment of the present utility model. Figure 1 As shown, the system includes: a demineralized water pipe 1, a pre-ammonia water outlet pipe 2 and a post-ammonia water outlet pipe 3 of the fine treatment mixed bed outlet main pipe, a programmable logic controller 4, and a conductivity cell 5; the demineralized water pipe 1 and the pre-ammonia water outlet pipe 2 are connected in parallel and then connected to the mixed water inlet pipe 6; the mixed water inlet pipe 6 and the post-ammonia water outlet pipe 3 are connected to the internal cooling water inlet pipe 7, and the internal cooling water inlet pipe 7 is connected to the generator internal cooling water tank 8.

[0020] Specifically, a sampling pipeline 9 is connected to the internal cooling water inlet pipe 7, and an electric conductivity cell 5 is installed on the sampling pipeline 9; an electric valve 10 for ammonia replenishment is installed on the mixed water inlet pipe 6, and an electric valve 11 for ammonia replenishment is installed on the ammonia outlet pipe 3.

[0021] The conductivity cell 5, the electric valve 10 for adding water before ammonia addition, and the electric valve 11 for adding water after ammonia addition are all electrically connected to the programmable logic controller 4.

[0022] Specifically, the conductivity cell 5 is used to monitor the conductivity of the makeup water in the internal cooling water inlet pipe 7;

[0023] The programmable logic controller 4 is used to control the on / off state of the electric valve 10 for water replenishment before ammonia addition and the electric valve 11 for water replenishment after ammonia addition.

[0024] Specifically, the programmable logic controller 4 uses the water conductivity in the internal cooling water inlet pipe 7 as a control parameter to control the opening and closing of the electric valve 10 for water replenishment before ammonia addition and the electric valve 11 for water replenishment after ammonia addition, so that the water conductivity in the internal cooling water inlet pipe 7 is within a preset range, for example, a preset range of 0.8~1.5μS / cm.

[0025] Specifically, such as Figure 1 As shown, filters 12 are installed on the ammonia-adding outlet pipe 2, the ammonia-adding outlet pipe 3, and the internal cooling water inlet pipe 7, respectively.

[0026] Specifically, such as Figure 1 As shown, the outlet of the generator's internal cooling water tank 8 is connected to the intermediate water tank 13. The outlet of the sampling pipeline 9 is connected to the intermediate water tank 13, and the outlet of the intermediate water tank 13 is connected to the steam side of the condenser.

[0027] Specifically, multiple overflow valves 14 are installed between the outlet of the generator internal cooling water tank 8 and the intermediate water tank 13. When the makeup water in the generator internal cooling water tank 8 exceeds the set height, the makeup water flows into the intermediate water tank 13 through the overflow valves 14, and is then transported to the condenser by the intermediate water tank 13.

[0028] Specifically, such as Figure 1 As shown, a sampling flow meter 15 is also installed on the sampling pipeline 9 to monitor the sampling water flow rate on the sampling pipeline 9.

[0029] Specifically, such as Figure 1 As shown, a water supply bypass is also provided on the internal cooling water inlet pipe 7. A water supply flow meter 16 and a bypass electric valve 17 are provided on the water supply bypass. A water supply ball valve 18 is provided on the internal cooling water inlet pipe 7. The water supply ball valve 18 is connected in parallel with the water supply bypass. Both the water supply flow meter 16 and the bypass electric valve 17 are electrically connected to the programmable logic controller 4.

[0030] The water supply flow meter 16 is used to monitor the water supply flow in the water supply bypass.

[0031] Preferably, two manual ball valves 22 are installed at each end of the water supply bypass.

[0032] During normal operation, the water supply ball valve 18 is closed, and the manual ball valves 22 at both ends of the water supply bypass are open. The water supply to the internal cooling water inlet pipe 7 can be controlled by controlling the bypass electric valve 17. When the bypass electric valve 17 malfunctions, the manual ball valves 22 at both ends of the water supply bypass are closed, and the water supply ball valve 18 is opened to achieve manual water supply.

[0033] Specifically, the programmable logic controller 4 can control the water supply flow from the internal cooling water inlet pipe 7 and the water supply bypass to the generator internal cooling water tank 8.

[0034] Specifically, a sampling flow rate adjustment valve 19 is also installed on the sampling pipeline 9 to control the sampling water flow rate in the sampling pipeline 9.

[0035] Specifically, such as Figure 1 As shown, pressure gauge valves 20 are installed on the water outlet pipe 2 before ammonia addition and the water outlet pipe 3 after ammonia addition, respectively, to monitor the water outlet pressure value in the pipeline.

[0036] Optionally, a check valve 21 is also provided on the demineralized water pipe 1 to prevent backflow of demineralized water.

[0037] In one optional embodiment provided by this utility model, such as Figure 1 As shown, two manual ball valves 22 are installed before and after the ammonia-adding water supply electric valve 11, and then connected in parallel with the bypass ball valve 23. During normal operation, the bypass ball valve 23 is closed and the two manual ball valves 22 are open. When the ammonia-adding water supply electric valve 11 malfunctions, the two manual ball valves 22 are closed and the bypass ball valve 23 is opened, so that the system can continue to operate.

[0038] Optionally, such as Figure 1 As shown, the outlet of the engine internal coolant tank 8 is also equipped with a water outlet valve 24 for manually draining water from the engine internal coolant tank 8.

[0039] This utility model provides a generator internal cooling water quality control system. The system automatically adjusts the conductivity and replenishment volume of the water from the high-speed mixed bed outlet header after ammonia addition and the demineralized water without ammonia addition into the internal cooling water tank in a certain proportion through a programmable logic controller (PLC) system. This ensures that the pH value of the generator internal cooling water reaches a controllable anti-corrosion range of 8.0 to 9.0, thereby minimizing the corrosion of the generator copper coils.

[0040] This utility model provides a generator internal cooling water quality control system that does not use a small mixed bed, does not require chemical treatment, does not discharge sewage, allows for arbitrary adjustment of the internal cooling water pH (optimal 8.5), and controls the conductivity (stator cooling water is guaranteed to be no greater than 1.5 μS / cm). It ensures that the copper ion content is consistently less than 10 μg / L on average. Once set up, no operation is required during operation. Apart from a small amount of condensate from demineralized water (without ammonia) and ammonia, there is no other consumption, greatly reducing operating costs and workload.

[0041] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A generator internal cooling water quality control system, characterized in that, include: The system includes a demineralized water pipe, a pre-ammonia water outlet pipe and a post-ammonia water outlet pipe of the fine treatment mixed bed outlet main pipe, a programmable logic controller, and a conductivity cell; the demineralized water pipe and the pre-ammonia water outlet pipe are connected in parallel and then connected to the mixed water inlet pipe; the mixed water inlet pipe and the post-ammonia water outlet pipe are connected together to the internal cooling water inlet pipe, and the internal cooling water inlet pipe is connected to the generator internal cooling water tank; The internal cooling water inlet pipe is connected to a sampling pipeline, and the conductivity cell is installed on the sampling pipeline; the mixing water inlet pipe is equipped with an electric valve for replenishing water before adding ammonia, and the water outlet pipe after adding ammonia is equipped with an electric valve for replenishing water after adding ammonia; The conductivity cell, the electric valve for replenishing water before ammonia addition, and the electric valve for replenishing water after ammonia addition are all electrically connected to the programmable logic controller. The conductivity cell is used to monitor the conductivity of the makeup water in the internal cooling water inlet pipe; The programmable logic controller is used to control the on / off state of the electric valve for water replenishment before ammonia addition and the electric valve for water replenishment after ammonia addition.

2. The generator internal cooling water quality control system according to claim 1, characterized in that: Filters are installed on the pre-ammonia water outlet pipe, the post-ammonia water outlet pipe, and the internal cooling water inlet pipe, respectively.

3. The generator internal cooling water quality control system according to claim 1, characterized in that: The outlet of the generator's internal cooling water tank is connected to the intermediate water tank.

4. The generator internal cooling water quality control system according to claim 3, characterized in that: The outlet of the sampling pipeline is connected to the intermediate water tank, and the outlet of the intermediate water tank is connected to the steam side of the condenser.

5. The generator internal cooling water quality control system according to claim 3, characterized in that: Multiple overflow valves are also installed between the outlet of the generator's internal cooling water tank and the intermediate water tank.

6. The generator internal cooling water quality control system according to claim 1, characterized in that: A sampling flow meter is also installed on the sampling pipeline to monitor the sampling water flow rate on the sampling pipeline.

7. The generator internal cooling water quality control system according to claim 1, characterized in that: The internal cooling water inlet pipe is also equipped with a water replenishment bypass, the water replenishment bypass is equipped with a water replenishment flow meter and a bypass electric valve, the internal cooling water inlet pipe is equipped with a water replenishment ball valve, and the water replenishment ball valve is connected in parallel with the water replenishment bypass; Both the water supply flow meter and the bypass electric valve are electrically connected to the programmable logic controller. The water supply flow meter is used to monitor the water supply flow rate in the water supply bypass.

8. The generator internal cooling water quality control system according to claim 1, characterized in that: The sampling pipeline is also equipped with a sampling flow rate adjustment valve to control the sampling water flow rate in the sampling pipeline.

9. The generator internal cooling water quality control system according to claim 1, characterized in that: Pressure gauge valves are respectively installed on the water outlet pipe before ammonia addition and the water outlet pipe after ammonia addition.

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