Generator rotor cooling water treatment system for thermal power plant
By installing a degasser, ion exchanger and alkaline water tank in the generator rotor cooling water system, combined with a PLC controller, the problems of low pH value and high copper ion content in the cooling water were solved, and the stability and safety of the cooling water were achieved.
Patent Information
- Application Number
- CN202422527636.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-18
- Publication Date
- 2025-10-14
- Estimated Expiration
- 2034-10-18
AI Technical Summary
The low pH value and high copper ion content in the generator rotor cooling water pose a safety hazard that is difficult to effectively resolve with existing technologies.
A degasser is used to remove carbon dioxide, an ion exchanger is set up to adsorb copper ions, and the pH value is adjusted by adding an alkaline water tank, combined with a PLC controller for intelligent control.
Effectively increase the pH value of cooling water to 7.2-7.9, and reduce the copper ion content to less than 20ug/L, meeting international standards and ensuring the safe operation of the generator.
Smart Images
Figure CN223433339U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of cooling water treatment, in particular to a generator rotor cooling water treatment system. Background Art
[0002] Generator rotor cooling water is the equipment with the highest cooling water quality requirements in thermal power plants. According to GB / T12145-2016 "Water and Steam Quality for Thermal Power Generators and Steam Power Equipment," the water quality control standard for internal cooling water in double-water internally cooled generators: the standard pH value of rotor cooling water (25°C) is 7.0-9.0; the standard value of copper content is ≤40ug / L, and the expected value is ≤20ug / L. During production and operation in some thermal power plants, due to the structure of the water-discharge tank at the end of the generator rotor outlet support, the cooling water enters the water-discharge tank after passing through the generator rotor, forming an acidic and corrosive environment. Carbon dioxide in the air dissolves into the cooling water, causing the cooling water pH to be low, resulting in an increase in the copper ion content of the rotor cooling water, posing a major safety hazard to the generator rotor system. Utility Model Content
[0003] Aiming at the above-mentioned problems of low pH and high copper ion content in the generator rotor cooling water, the utility model designs a generator rotor cooling water treatment system for a thermal power plant.
[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:
[0005] A generator rotor cooling water treatment system for a thermal power plant comprises a steam turbine, a degasser, a rotor cooling water tank, a rotor cooling pump, a transfer cooling water cooler, a filter, a No. 1 pH meter, a water cut-off protection device, a water inlet valve, an ion exchanger, a motor, an alkali water tank, a desalted water pipe, an agitator, an alkali pump, an alkali liquid tank, a No. 2 pH meter, a desalted water tank, and a three-way valve. The turbine cooling water outlet is connected to the rotor cooling water tank inlet through a rotor return pipe, the rotor return pipe is provided with a degasser, the rotor cooling water tank outlet is connected to the water inlet of the rotor cooling pump through a pipeline, the water outlet of the rotor cooling pump is connected to the transfer cooling water cooler inlet through a pipeline, the transfer cooling water cooler outlet is connected to the water inlet of the filter through a pipeline, the filter outlet is connected to the turbine cooling water inlet through a pipeline, a water cut-off protection device is provided on the pipeline between the filter and the turbine cooling water inlet, and the desalted water tank is connected to the rotor cooling water tank water supply port through the desalted water pipe.
[0006] Furthermore, a three-way valve and a No. 2 pH detector are provided on the desalted water pipe, two ports of the three-way valve are located on the desalted water pipe, the other port of the three-way valve is connected to the water inlet of the alkali water tank through a pipeline, the alkali inlet of the alkali water tank is connected to the alkali liquid tank through a pipeline with an alkali pump, and the water outlet of the alkali water tank is connected to the water supply port of the rotor cooling water tank through a pipeline.
[0007] Furthermore, an agitator is provided in the alkaline water tank, and the agitator is connected to the output shaft of the motor.
[0008] Furthermore, an ion exchanger is provided on the pipeline between the water outlet of the alkali water tank and the water supply port of the rotor cooling water tank.
[0009] Furthermore, a pH detector is installed at the water outlet of the filter, and the water outlet of the filter is connected to the water inlet of the alkaline water tank through a pipeline with a water inlet valve.
[0010] Furthermore, it also includes a PLC controller, the water inlet valve and the three-way valve are all electric valves, the No. 1 pH detector, the water inlet valve, the three-way valve, the No. 2 pH detector, and the alkali adding pump are all connected to the PLC controller with wires, and the PLC controller receives the detection signals of the No. 1 pH detector and the No. 2 pH detector, and controls the water inlet valve, the three-way valve, and the alkali adding pump according to the detection signals of the No. 1 pH detector and the No. 2 pH detector.
[0011] Compared with the prior art, the utility model has the following advantages:
[0012] 1. The utility model is equipped with a degasser, which can eliminate carbon dioxide entering the cooling water treatment system, effectively reduce acid radical ions in the water, and prevent the pH value of the cooling water from decreasing.
[0013] 2. The utility model provides an ion exchanger to adsorb copper ions and other impurity ions in cooling water and desalted water, which is beneficial to maintaining the stability of the pH value of cooling water and desalted water.
[0014] 3. The utility model is provided with an alkali water tank, through which alkali is added to the cooling water and desalted water to increase the pH value of the cooling water and desalted water to ensure that the pH value meets the use requirements.
[0015] 4. The utility model uses a PLC controller to intelligently control the system, which is easy to operate and can effectively ensure the safe operation of the generator. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is the process diagram of the utility model;
[0017] Figure 2 This is the control framework diagram of the utility model;
[0018] In the figure: steam turbine 1, deaerator 2, rotor cooling water tank 3, rotor cooling pump 4, rotor cooling water cooler 5, filter 6, No. 1 pH meter 7, water cut-off protection device 8, water inlet valve 9, ion exchanger 10, motor 11, alkali water tank 12, desalted water pipe 13, stirrer 14, alkali pump 15, alkali liquid tank 16, No. 2 pH meter 17, desalted water tank 18, three-way valve 19. DETAILED DESCRIPTION
[0019] In order to further illustrate the technical solution of the present invention, the present invention will be further described below through embodiments.
[0020] like Figure 1 、 Figure 2As shown, a generator rotor cooling water treatment system for a thermal power plant is characterized by comprising: a steam turbine 1, a degasser 2, a rotor cooling water tank 3, a rotor cooling pump 4, a rotor cooling water cooler 5, a filter 6, a No. 1 pH detector 7, a water cut-off protection device 8, a water inlet valve 9, an ion exchanger 10, a motor 11, an alkali water tank 12, a desalted water pipe 13, a stirrer 14, an alkali pump 15, an alkali liquid tank 16, a No. 2 pH detector 17, a desalted water tank 18, and a three-way valve 19. The cooling water outlet of the steam turbine 1 is connected to the rotor cooling water tank 3 through a rotor return pipe. The rotor return pipe is provided with a degasser 2 to eliminate carbon dioxide entering the cooling water system, effectively reduce acid radical ions in the water, and improve The pH value of the cooling water is high. The water outlet of the rotor cooling water tank 3 is connected to the water inlet of the rotor cooling pump 4 through a pipeline. The water outlet of the rotor cooling pump 4 is connected to the water inlet of the cooling water cooler 5 through a pipeline. The water outlet of the cooling water cooler 5 is connected to the water inlet of the filter 6 through a pipeline. The water outlet of the filter 6 is connected to the cooling water inlet of the turbine 1 through a pipeline. A water cut-off protection device 8 is provided on the pipeline between the filter 6 and the cooling water inlet of the turbine 1. The desalted water tank 18 is connected to the water supply port of the rotor cooling water tank 3 through the desalted water pipe 13. A three-way valve 19 and a No. 2 pH detector 17 are provided on the desalted water pipe 13. The two ports of the three-way valve 19 are located at the desalted water. On the pipe 13, the other port of the three-way valve 19 is connected to the water inlet of the alkali water tank 12 through a pipeline, the alkali inlet of the alkali water tank 12 is connected to the alkali liquid tank 16 through a pipeline with an alkali pump 15, and the water outlet of the alkali water tank 12 is connected to the water supply port of the rotor cooling water tank 3 through a pipeline. A stirrer 14 is provided in the alkali water tank 12, and the stirrer 14 is connected to the output shaft of the motor 11. An ion exchanger 10 is provided on the pipeline between the water outlet of the alkali water tank 12 and the water supply port of the rotor cooling water tank 3. The ion exchanger 10 adopts the form of a mixture of yin and yang resins, which is conducive to maintaining the alkaline pH. A pH detector is installed at the water outlet of the filter 6 The meter 7 is connected to the water inlet of the alkaline water tank 12 at the water outlet of the filter 6 through a pipeline with a water inlet valve 9, and also includes a PLC controller. The water inlet valve 9 and the three-way valve 19 are all electric valves. The No. 1 pH detector 7, the water inlet valve 9, the three-way valve 19, the No. 2 pH detector 17, and the alkali pump 15 are all connected to the PLC controller with wires. The PLC controller receives the detection signals of the No. 1 pH detector 7 and the No. 2 pH detector 17, and controls the water inlet valve 9, the three-way valve 19, and the alkali pump 15 according to the detection signals of the No. 1 pH detector 7 and the No. 2 pH detector 17. The PLC controller is used for intelligent control, which is easy to operate and ensures the safe operation of the generator.
[0021] In addition, after the cooling water treatment device was put into normal operation, the present invention conducted tests to verify and record the changes in the pH value and copper ion content of the cooling water. The test results are shown in Table 1:
[0022] Table 1 Test results
[0023]
[0024] After the cooling water treatment device is put into operation, the carbon dioxide content of the cooling water is reduced by the degasser 2, the alkaline water tank 12 is used to adjust the pH value, and the ion exchanger 10 adsorbs copper ions, so that the pH of the cooling water is maintained between 7.2-7.9 and the copper ion content is less than 20ug / L, which meets international standards.
[0025] The above shows and describes the main features and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be encompassed within the present invention.
[0026] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A generator rotor cooling water treatment system for a thermal power plant, characterized by: The invention comprises a steam turbine (1), a degasser (2), a rotor cooling water tank (3), a rotor cooling pump (4), a rotor cooling water cooler (5), a filter (6), a No. 1 pH detector (7), a water cut-off protection device (8), a water inlet valve (9), an ion exchanger (10), a motor (11), an alkali water tank (12), a desalted water pipe (13), a stirrer (14), an alkali pump (15), an alkali liquid tank (16), a No. 2 pH detector (17), a desalted water tank (18), and a three-way valve (19). The cooling water outlet of the steam turbine (1) is connected to the rotor cooling water tank (3) through a rotor return pipe. The rotor return pipe is provided with a A deaerator (2) is provided, the water outlet of the rotor cooling water tank (3) is connected to the water inlet of the rotor cooling pump (4) through a pipeline, the water outlet of the rotor cooling pump (4) is connected to the water inlet of the transfer cooling water cooler (5) through a pipeline, the water outlet of the transfer cooling water cooler (5) is connected to the water inlet of the filter (6) through a pipeline, the water outlet of the filter (6) is connected to the cooling water inlet of the turbine (1) through a pipeline, a water cut-off protection device (8) is provided on the pipeline between the filter (6) and the cooling water inlet of the turbine (1), and the desalted water tank (18) is connected to the water supply port of the rotor cooling water tank (3) through a desalted water pipe (13).
2. The generator rotor cooling water treatment system for a thermal power plant according to claim 1, characterized in that: A three-way valve (19) and a second pH detector (17) are provided on the desalted water pipe (13). Two ports of the three-way valve (19) are located on the desalted water pipe (13). The other port of the three-way valve (19) is connected to the water inlet of the alkali-adding water tank (12) through a pipeline. The alkali inlet of the alkali-adding water tank (12) is connected to the alkali liquid tank (16) through a pipeline with an alkali-adding pump (15). The water outlet of the alkali-adding water tank (12) is connected to the water supply port of the rotor cooling water tank (3) through a pipeline.
3. The generator rotor cooling water treatment system for a thermal power plant according to claim 2, characterized in that: A stirrer (14) is provided in the alkaline water tank (12), and the stirrer (14) is connected to the output shaft of the motor (11).
4. The generator rotor cooling water treatment system for a thermal power plant according to claim 3, characterized in that: An ion exchanger (10) is provided on the pipeline between the water outlet of the alkaline water tank (12) and the water supply port of the rotor cooling water tank (3).
5. The generator rotor cooling water treatment system for a thermal power plant according to claim 4, characterized in that: A pH detector (7) is installed at the water outlet of the filter (6), and the water outlet of the filter (6) is connected to the water inlet of the alkaline water tank (12) through a pipeline with a water inlet valve (9).
6. The generator rotor cooling water treatment system for a thermal power plant according to claim 5, characterized in that: The invention also includes a PLC controller. The water inlet valve (9) and the three-way valve (19) are both electric valves. The No. 1 pH detector (7), the water inlet valve (9), the three-way valve (19), the No. 2 pH detector (17), and the alkali adding pump (15) are all connected to the PLC controller by wires. The PLC controller receives detection signals from the No. 1 pH detector (7) and the No. 2 pH detector (17), and controls the water inlet valve (9), the three-way valve (19), and the alkali adding pump (15) according to the detection signals from the No. 1 pH detector (7) and the No. 2 pH detector (17).