An automatic monitoring device for improving the quality of the condenser water in a thermal power plant

Abstract

The utility model discloses a kind of device for automatically monitoring and improving fixed cold water quality of thermal power plant, it is related to thermal power unit technical field, including detection module, dosing module and control module, the detection module includes sampling import, conductivity detection pipeline, pH detection pipeline and drain, the dosing module includes water addition pipeline, dosing pipeline, dilution vessel, dilution pipeline and dosing port, the control module is electrically connected with the conductivity detection pipeline, pH detection pipeline, water addition pipeline, dosing pipeline, dilution pipeline, agitator and liquid level gauge by wiring terminal row, for receiving detection data, and based on control algorithm control dosing amount of dosing module;The utility model is detected by the detection module and dosing module set, under the control of control module, the real-time detection and feedback of generator fixed cold water quality can be realized, and according to the data of feedback control single-time adjustment medicament addition amount, realize accurate, stable control to water quality.

Description

Technical Field

[0001] This utility model relates to the field of thermal power unit technology, specifically to a device for automatically monitoring and improving the quality of cooling water in thermal power plants. Background Technology

[0002] Generators generate a significant amount of heat during operation. If this heat is not dissipated promptly, the temperature of the generator windings will rise, potentially damaging the insulation and even causing serious consequences such as short circuits. Therefore, generators are equipped with cooling systems. Currently, most domestic steam turbine generator sets employ a water-hydrogen-hydrogen cooling scheme. This means the stator windings (including stator leads, transition leads, and outgoing lines) are internally cooled with water, the rotor windings are internally cooled with hydrogen, and the core and structural components are cooled via the surface of hydrogen. In generator sets using the water-hydrogen-hydrogen cooling method, the stator cooling water plays a crucial role. As an internal cooling medium, it specifically provides cooling for the generator stator windings and their leads, transition leads, and outgoing lines. Its core function is to effectively remove the heat generated by the internal stator windings, ensuring that the generator stator windings operate within a safe and stable temperature range.

[0003] The core function of the power plant's stator cooling water system is to ensure stable cooling of the generator stator coils, while monitoring key parameters to ensure equipment safety and efficiency. However, existing automatic dosing devices may have problems such as uneven dosing, delayed response, and low control precision, making it difficult to achieve real-time and accurate control. If the stator cooling water quality parameters (such as conductivity and pH value) exceed the allowable range, it may lead to equipment corrosion, scaling, or decreased insulation performance, affecting the safe operation of the generator.

[0004] Therefore, a device is needed to automatically monitor and regulate the quality of the cooling water to improve system reliability and automation. Utility Model Content

[0005] The purpose of this invention is to provide an automatic device for monitoring and regulating the quality of cooling water in thermal power plants. This device can automatically monitor and regulate the quality of cooling water, and has functions such as reasonable sampling point layout, accurate flow control, sensitive regulation, and automatic control through PID control. It does not require manual intervention and effectively ensures that the quality of cooling water meets the usage requirements.

[0006] To achieve the above objectives, this utility model provides the following technical solution: This utility model discloses an automatic monitoring and improvement device for the quality of cooling water in thermal power plants, comprising a detection module, a dosing module, and a control module. The detection module includes a sampling inlet, a conductivity detection pipeline, a pH detection pipeline, and a drain outlet. The sampling inlet is connected to the generator cooling water inlet pipe via a pipeline. The conductivity detection pipeline and the pH detection pipeline are connected in parallel and are both connected to the sampling inlet. The outlets of the conductivity detection pipeline and the pH detection pipeline converge and are connected to the drain outlet. The dosing module includes a water dosing pipeline, a dosing pipeline, a dilution container, a dilution pipeline, and a dosing port. The inlet of the water dosing pipeline is connected to the sampling inlet, and its outlet is connected to the inlet of the dilution container. The outlet of the dosing pipeline is connected to the inlet of the dilution container, the outlet of the dilution container is connected to the inlet of the dilution pipeline, and the outlet of the dilution pipeline is connected to the dosing port. The dilution container is equipped with a stirrer and a level gauge. The control module is electrically connected to the conductivity detection pipeline, pH detection pipeline, water addition pipeline, chemical addition pipeline, dilution pipeline, stirrer and level gauge via a terminal block. It is used to receive detection data and control the amount of chemical added by the chemical addition module based on the control algorithm.

[0007] As a preferred technical solution of this utility model, the conductivity detection pipeline includes a first sampling control valve, a first sampling flow meter, a conductivity electrode flow cell, and a first drainage control valve connected in series through the pipeline. The inlet of the first sampling control valve is connected to the sampling inlet through the pipeline, and the outlet of the first drainage control valve is connected to the drain outlet through the pipeline.

[0008] As a preferred technical solution of this utility model, the pH value detection pipeline includes a second sampling control valve, a second sampling flow meter, a pH electrode flow cell, and a second drainage control valve connected in series through the pipeline. The inlet of the second sampling control valve is connected to the sampling inlet through the pipeline, and the outlet of the second drainage control valve is connected to the drain outlet through the pipeline.

[0009] As a preferred embodiment of this utility model, the water supply pipeline of the dosing module includes a water supply control valve and a water supply flow meter connected in series through the pipeline. The inlet of the water supply control valve is connected to the sampling inlet through the pipeline, and the outlet of the water supply flow meter is connected to the inlet of the dilution container through the pipeline.

[0010] As a preferred technical solution of this utility model, the dosing pipeline of the dosing module includes a dosing tank and a first dosing pump connected in series through the pipeline, and the outlet of the first dosing pump is connected to the inlet of the dilution container through the pipeline.

[0011] As a preferred technical solution of this utility model, the dilution pipeline of the dosing module includes a second dosing pump and a dosing control valve connected in series through the pipeline. The inlet of the second dosing pump is connected to the outlet of the dilution container through the pipeline, and the outlet of the dosing control valve is connected to the dosing port through the pipeline.

[0012] As a preferred embodiment of this utility model, the sampling inlet is connected to the sampling point of the generator's constant cooling water inlet pipe.

[0013] The beneficial effects of this utility model are: 1. This utility model achieves real-time and precise control of the water quality of the cooling water by automatically monitoring the conductivity and pH value of the cooling water and automatically adding chemicals through PID control, without the need for manual intervention, thus improving the system efficiency and reliability.

[0014] 2. The sampling points of the constant cooling water in this utility model are reasonably laid out. Sampling is carried out by the pressure of the constant cooling water inlet pipe, eliminating the need for an additional booster pump, thus saving costs and energy. At the same time, the flow control is accurate and the adjustment is sensitive through the various flow meters set up, preventing excessive flow from affecting the test and ensuring the accuracy of the test results.

[0015] 3. This utility model solves the problems of uneven and inaccurate micro-dosing by using a pre-dilution process to mix high-concentration drugs into a uniform dilute solution in a dilution container before injecting them into the main system, thus achieving precise and stable control of water quality. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a device for automatically monitoring and improving the quality of cooling water in thermal power plants, according to this utility model.

[0017] In the diagram: 1. Sampling inlet; 2. First sampling control valve; 3. First sampling flow meter; 4. Conductivity electrode flow cell; 5. First drain control valve; 6. Second sampling control valve; 7. Second sampling flow meter; 8. pH electrode flow cell; 9. Second drain control valve; 10. Drain outlet; 11. Terminal block; 12. Dosing tank; 13. First dosing pump; 14. Dilution container; 15. Water dosing control valve; 16. Water dosing flow meter; 17. Second dosing pump; 18. Dosing control valve; 19. Dosing port. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] like Figure 1 As shown, an automatic monitoring and improvement device for the quality of cooling water in a thermal power plant includes a detection module, a dosing module, and a control module. The detection module includes a sampling inlet 1, a conductivity detection pipeline, a pH detection pipeline, and a drain outlet 10. The sampling inlet 1 is connected to the generator cooling water inlet pipe via a pipeline. The conductivity detection pipeline and the pH detection pipeline are connected in parallel and are both connected to the sampling inlet 1. The outlets of the conductivity detection pipeline and the pH detection pipeline converge and are connected to the drain outlet. In this embodiment, the generator cooling water is introduced into the device through the sampling inlet 1. The sampled water is divided into two streams and enters the conductivity detection pipeline and the pH detection pipeline respectively. After the conductivity detection pipeline and the pH detection pipeline detect the conductivity and pH value of the sampled water, the detected data are fed back to the control module, and the wastewater is discharged through the drain outlet 10.

[0020] The dosing module includes a water supply pipeline, a dosing pipeline, a dilution container 14, a dilution pipeline, and a dosing port 19. The inlet of the water supply pipeline is connected to the sampling inlet 1, and the outlet is connected to the inlet of the dilution container 14. The outlet of the dosing pipeline is connected to the inlet of the dilution container 14, the outlet of the dilution container 14 is connected to the inlet of the dilution pipeline, and the outlet of the dilution pipeline is connected to the dosing port 19. In this embodiment, the control module feeds back the received sampled water data to the dosing pipeline and controls the dosing pipeline to add chemicals to the dilution container 14. At the same time, the water supply pipeline takes a certain amount of generator cooling water through the sampling inlet 1 and puts it into the dilution container 14. After being mixed in the dilution container 14, it enters the generator cooling water system through the dilution pipeline.

[0021] The dilution container 14 is equipped with a stirrer and a level gauge. In this embodiment, the dilution container 14 can use the stirrer to mix the incoming drug solution and sampled water. The level gauge can prevent the container from overflowing (too high level) or the stirrer from running dry (too low level), ensuring safe operation.

[0022] The control module is electrically connected to the conductivity detection pipeline, pH detection pipeline, water addition pipeline, chemical dosing pipeline, dilution pipeline, stirrer, and level gauge via terminal block 11. It receives detection data and controls the dosage of the chemical dosing module based on a control algorithm. In this embodiment, the conductivity and pH detection pipelines feed back the detected data to the control module via terminal block 11. After receiving the data, the control module runs a control algorithm (such as a PID algorithm) to analyze the detection data. When the detected water quality parameter deviates from the set value, the control module starts the chemical dosing module, and then controls the dosage based on the detection data.

[0023] The conductivity detection pipeline includes a first sampling control valve 2, a first sampling flow meter 3, a conductivity electrode flow cell 4, and a first drain control valve 5 connected in series via a pipeline. The inlet of the first sampling control valve 2 is connected to the sampling inlet 1 via a pipeline, and the outlet of the first drain control valve 5 is connected to the drain outlet 10 via a pipeline. In this embodiment, when the conductivity of the generator constant cooling water is detected, the first sampling control valve 2 is opened, and the sampled water flows through the sampling inlet 1, sequentially through the first sampling control valve 2 and the first sampling flow meter 3, and then into the conductivity electrode flow cell 4. The first sampling flow meter 3 is used to adjust and display the flow rate of the sampled water to ensure that the detection is carried out under optimal conditions. The conductivity of the sampled water is detected in the conductivity electrode flow cell 4. After the detection is completed, the data is fed back to the control module, and then the first drain control valve 5 is opened to allow the wastewater after detection to be discharged through the drain outlet 10.

[0024] The pH detection pipeline includes a second sampling control valve 6, a second sampling flow meter 7, a pH electrode flow cell 8, and a second drain control valve 9 connected in series via a pipeline. The inlet of the second sampling control valve 6 is connected to the sampling inlet 1 via a pipeline, and the outlet of the second drain control valve 9 is connected to the drain outlet 10 via a pipeline. In this embodiment, when the pH value of the generator stator cooling water is detected, the second sampling control valve 6 is opened, and the sampled water flows through the sampling inlet 1, sequentially through the second sampling control valve 6 and the second sampling flow meter 7, and then enters the pH electrode flow cell 8. The pH value of the sampled water is detected in the pH electrode flow cell 8. After the detection is completed, the data is fed back to the control module, and then the second drain control valve 9 is opened, so that the detected wastewater is discharged through the drain outlet 10.

[0025] The dosing pipeline of the dosing module includes a dosing tank 12 and a first dosing pump 13 connected in series via a pipeline. The outlet of the first dosing pump 13 is connected to the inlet of the dilution container 14 via a pipeline. In this embodiment, when the control module needs to add chemicals based on the detection data of the constant cooling water, it controls the first dosing pump 13 to pump the chemicals from the dosing tank 12 into the dilution container 14. The dosage is controlled by the control module based on the detection data. In addition, multiple dosing tanks containing different chemicals can be set up, and different chemicals can be added in a targeted manner according to different data feedback.

[0026] The water supply pipeline of the dosing module includes a water supply control valve 15 and a water supply flow meter 16 connected in series via a pipeline. The inlet of the water supply control valve 15 is connected to the sampling inlet 1 via a pipeline, and the outlet of the water supply flow meter 16 is connected to the inlet of the dilution container 14 via a pipeline. In this embodiment, when dosing is required, the control module will simultaneously control the water supply control valve 15 of the water supply pipeline to open, and the constant cooling water flows through the sampling inlet 1, the water supply control valve 15 and the water supply flow meter 16, and then enters the dilution container 14.

[0027] The dilution pipeline of the dosing module includes a second dosing pump 17 and a dosing control valve 18 connected in series via pipelines. The inlet of the second dosing pump 17 is connected to the outlet of the dilution container 14 via a pipeline, and the outlet of the dosing control valve 18 is connected to the dosing port 19 via a pipeline. In this embodiment, after the dilution container 14 has finished mixing the agent and diluent inside, the second dosing pump 17 and the dosing control valve 18 are opened, and the second dosing pump 17 injects the diluted agent into the constant cooling water system through the dosing port 19.

[0028] Sampling inlet 1 is connected to the sampling point of the generator's stator cooling water inlet pipe. In this embodiment, the pressure at the sampling point is 0.2~0.3MPa, and sampling can be performed using the internal pressure of the generator's stator cooling water inlet pipe, without the need for a booster pump.

[0029] Working Principle: When sampling and testing are required, the first sampling control valve 2 is opened first. Since the pressure inside the generator's constant cooling water inlet pipe is 0.2MPa~0.3MPa, the constant cooling water will flow to the first sampling control valve 2 under pressure, then pass through the first sampling flow meter 3 and enter the conductivity electrode flow cell 4. After the first sampling flow meter 3 indicates that a certain amount of constant cooling water has entered, the first sampling control valve 2 is closed. The conductivity electrode flow cell 4 then begins to detect the conductivity of the sampled constant cooling water. After the detection is completed, the data is fed back to the control module. Then, the first drain control valve 5 is opened, and the wastewater from the conductivity electrode flow cell 4 is discharged through the drain outlet 10. Next, the second sampling control valve 6 is opened, and the constant cooling water flows through the second sampling flow meter 7 under pressure and enters the pH electrode flow cell 8. After a certain amount of constant cooling water has entered, the sampling control valve 6 is closed, and the pH electrode flow cell 8 begins to detect the conductivity of the sampled constant cooling water. pH value is measured, and the data is fed back to the control module after the test. Then, the second drainage control valve 9 is opened, and the wastewater after testing is discharged through the drain outlet 10. After receiving the two data, the control module analyzes them to determine whether the water quality of the constant cooling water needs to be adjusted and improved. If improvement is required, the control module controls the dosing module to add chemicals. The control module first controls the first dosing pump 13 to add a quantitative amount of chemical to the dilution container 14 based on the test data and through the control algorithm. Then, it controls the water dosing control valve 15 to open. The constant cooling water flows through the water dosing flow meter 16 under pressure and enters the dilution container 14. After adding the quantitative amount of water, the agitator of the dilution container 14 is started to stir and mix the solution inside. After mixing is completed, the dosing control valve 18 and the second dosing pump 17 are opened to inject the diluted chemical into the constant cooling water system through the dosing port 19, completing one adjustment. The entire cycle continues to ensure the stability of water quality.

[0030] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for automatically monitoring and improving the quality of cooling water in thermal power plants, characterized in that, It includes a detection module, a dosing module and a control module. The detection module includes a sampling inlet (1), a conductivity detection pipeline, a pH detection pipeline and a drain outlet (10). The sampling inlet (1) is connected to the generator constant cooling water inlet pipe through a pipeline. The conductivity detection pipeline and the pH detection pipeline are connected in parallel and are both connected to the sampling inlet (1). The outlets of the conductivity detection pipeline and the pH detection pipeline converge and are connected to the drain outlet (10). The dosing module includes a water supply pipeline, a dosing pipeline, a dilution container (14), a dilution pipeline, and a dosing port (19). The inlet of the water supply pipeline is connected to the sampling inlet (1), and its outlet is connected to the inlet of the dilution container (14). The outlet of the dosing pipeline is connected to the inlet of the dilution container (14), the outlet of the dilution container (14) is connected to the inlet of the dilution pipeline, and the outlet of the dilution pipeline is connected to the dosing port (19). The dilution container (14) is equipped with a stirrer and a level gauge; The control module is electrically connected to the conductivity detection pipeline, pH detection pipeline, water addition pipeline, chemical addition pipeline, dilution pipeline, stirrer and level gauge via a terminal block (11). The control module is used to receive detection data and control the amount of chemical added by the chemical addition module based on the control algorithm.

2. The device for automatically monitoring and improving the quality of cooling water in thermal power plants according to claim 1, characterized in that, The conductivity detection pipeline includes a first sampling control valve (2), a first sampling flow meter (3), a conductivity electrode flow cell (4), and a first drainage control valve (5) connected in series through the pipeline. The inlet of the first sampling control valve (2) is connected to the sampling inlet (1) through the pipeline, and the outlet of the first drainage control valve (5) is connected to the drain outlet (10) through the pipeline.

3. The device for automatically monitoring and improving the quality of cooling water in thermal power plants according to claim 1, characterized in that, The pH detection pipeline includes a second sampling control valve (6), a second sampling flow meter (7), a pH electrode flow cell (8), and a second drain control valve (9) connected in series through the pipeline. The inlet of the second sampling control valve (6) is connected to the sampling inlet (1) through the pipeline, and the outlet of the second drain control valve (9) is connected to the drain outlet (10) through the pipeline.

4. The device for automatically monitoring and improving the quality of cooling water in thermal power plants according to claim 1, characterized in that, The dosing pipeline includes a dosing tank (12) and a first dosing pump (13) connected in series through the pipeline. The outlet of the first dosing pump (13) is connected to the inlet of the dilution container (14) through the pipeline.

5. The device for automatically monitoring and improving the quality of cooling water in thermal power plants according to claim 1, characterized in that, The water supply pipeline includes a water supply control valve (15) and a water supply flow meter (16) connected in series through the pipeline. The inlet of the water supply control valve (15) is connected to the sampling inlet (1) through the pipeline, and the outlet of the water supply flow meter (16) is connected to the inlet of the dilution container (14) through the pipeline.

6. The device for automatically monitoring and improving the quality of cooling water in thermal power plants according to claim 1, characterized in that, The dilution pipeline includes a second dosing pump (17) and a dosing control valve (18) connected in series through the pipeline. The inlet of the second dosing pump (17) is connected to the outlet of the dilution container (14) through the pipeline, and the outlet of the dosing control valve (18) is connected to the dosing port (19) through the pipeline.

7. The device for automatically monitoring and improving the quality of cooling water in thermal power plants according to claim 1, characterized in that, The sampling inlet (1) is connected to the sampling point of the generator constant cooling water inlet pipe.

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