Methods and intelligent treatment devices for adjusting the cooling water quality inside the synchronous condenser rotor

Abstract

This invention discloses a method and intelligent treatment device for regulating the cooling water quality inside a synchronous condenser rotor. The method includes bypassing the cooling water inside the synchronous condenser rotor by first passing it through a purification membrane to obtain desalinated and concentrated water. The concentrated water is then passed through an ion exchange resin to remove ions. The desalinated water is mixed with deionized internal cooling water and an alkali solution is added before being returned to the cooling water system inside the synchronous condenser rotor. The device includes a synchronous condenser rotor water tank, a purification membrane device, an ion exchanger group, an alkali solution tank, and a control system. The control system adjusts the outlet flow rate of the synchronous condenser rotor water tank according to the cooling water quality inside the rotor, adjusts the outlet flow rate of the desalinated water according to the conductivity of the mixed water from the ion exchanger group, and adjusts the flow rate of the alkali solution tank according to the conductivity of the return water. The method and device of this invention can intelligently control and effectively regulate the cooling water quality inside the rotor, forming a low conductivity, high pH internal cooling water system. Furthermore, it has advantages such as low maintenance workload, zero wastewater discharge, high safety and reliability, and good economy.

Description

Technical Field

[0001] This invention belongs to the field of cooling water treatment for synchronous condensers, and specifically relates to a method for adjusting the water quality of cooling water inside the rotor of a synchronous condenser and an intelligent treatment device. Background Technology

[0002] With the construction of ultra-high voltage direct current (UHVDC) projects, in order to further and effectively improve the stability of power grid operation, the State Grid Corporation of China has installed 300MVar large-capacity dual-water-cooled fast dynamic response synchronous condensers in the UHVDC projects. This is because the synchronous condenser, as a rotating reactive power generator, can not only enter phase operation mode to absorb reactive power, suppress system voltage rise, and improve voltage levels when the DC system is blocked due to a fault, but also provide dynamic reactive power support to the AC grid in a lagging phase operation mode when the DC system needs voltage support during normal operation. At the same time, it can also provide strong excitation support for voltage and system stability when a fault occurs near the AC grid and the voltage drops, thus gaining valuable time for fault clearing.

[0003] The large amount of heat generated during the operation of the synchronous condenser needs to be dissipated through the cooling system. Substandard water quality accelerates the corrosion of the synchronous condenser coils, leading to copper oxide deposits, reduced heat transfer efficiency of the internal cooling water pipes, and increased susceptibility to blockages within the coils, seriously threatening the safe operation of the unit. Therefore, appropriate water quality regulation is necessary to ensure that the cooling water meets the required standards.

[0004] Currently, the treatment of cooling water inside the rotor of a dual-water-cooled synchronous condenser mainly references the method used for generator rotor cooling water treatment. However, synchronous condensers and generators differ significantly in their operating methods and structures, leading to the following drawbacks when using membrane alkalization devices to regulate the cooling water quality inside the rotor: First, the cooling water quality does not meet standard requirements. Currently operating synchronous condensers have a rotor cooling water pH less than 7 and a copper ion content greater than 40 μg / L, reaching over 500 μg / L during startup, far exceeding the standard value. Water quality regulation is slow, failing to meet the expected value of 20 μg / L. Second, the ion exchange resin in the ion exchanger requires frequent replacement; a single resin set has a service life of only 4-6 months, resulting in high maintenance costs. Due to the deficiencies in the rotor cooling water quality regulation methods and treatment devices, the substandard water quality in the synchronous condenser rotor cooling water system and the high cost of resin replacement and maintenance affect the safe and economical operation of the synchronous condenser. These issues urgently need to be addressed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method and intelligent treatment device for adjusting the cooling water quality inside the rotor of a synchronous condenser. The water quality adjustment method and intelligent treatment device can effectively adjust the cooling water system inside the rotor to always maintain a pH value of 8.0-9.0, a copper ion content of ≤20μg / L, and a conductivity of less than 3.0μS / cm through water tank bypass treatment, forming a low conductivity and high pH rotor cooling water system. The intelligent treatment device can intelligently control the cooling water quality inside the rotor and has the advantages of less operation and maintenance work, zero wastewater discharge, high safety and reliability, and good economy.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A method for adjusting the cooling water quality inside a synchronous condenser rotor includes the following steps: The cooling water inside the synchronous condenser rotor is bypassed and first passed through a purification membrane to obtain fresh water and concentrated water. The fresh water is internal cooling water with solid particulate matter, divalent and higher ions, and some monovalent ions removed. The concentrated water is then treated with an ion exchange resin to further completely remove ions, resulting in deionized internal cooling water. The fresh water and the deionized internal cooling water are mixed and an alkaline solution is added before being returned to the cooling water system inside the synchronous condenser rotor to achieve water quality adjustment.

[0008] Preferably, in the above-described method for adjusting the cooling water quality inside the synchronous condenser rotor, the flow rate of the bypass treatment of the cooling water inside the synchronous condenser rotor is controlled within 4.0 m³ / s. 3 / h~5.0m 3 / h.

[0009] In the above-mentioned method for adjusting the cooling water quality inside the rotor of the condenser, preferably, the purification membrane is a selective ion filter membrane, which meets the following requirements: filters all particulate matter, removes more than 97% of divalent and higher ions, and removes 45% to 50% of monovalent ions.

[0010] In the above-mentioned method for adjusting the cooling water quality inside the rotor of the condenser, preferably, the ion exchange resin is disposed in an ion exchanger, the ion exchanger is a mixed bed composed of anion and cation exchange resins, and the effluent conductivity of the ion exchanger is less than 0.08 μS / cm.

[0011] In the above-mentioned method for adjusting the cooling water quality inside the rotor of the condenser, preferably, before adding alkaline solution, the conductivity of the mixed water of the fresh water and the deionized internal cooling water is controlled at 0.15 μS / cm to 0.30 μS / cm.

[0012] In the above-mentioned method for adjusting the cooling water quality inside the rotor of the condenser, preferably, the amount of alkali solution added is controlled such that the conductivity of the mixture of fresh water and deionized internal cooling water after adding alkali solution is 3.2 μS / cm to 3.5 μS / cm.

[0013] As a general technical concept, the present invention also provides an intelligent treatment device for regulating the cooling water quality inside the rotor of a synchronous condenser, including a synchronous condenser rotor water tank, a purification membrane device, an ion exchanger group, an alkali tank, and a control system. The synchronous condenser rotor water tank is provided with an outlet and a return water outlet. The purification membrane device is provided with an inlet, a fresh water outlet, and a concentrated water outlet. The outlet of the synchronous condenser rotor water tank is connected to the inlet of the purification membrane device. The fresh water outlet of the purification membrane device is connected to the return water outlet of the synchronous condenser rotor water tank. The concentrated water outlet of the purification membrane device is connected to the inlet of the ion exchanger group. The outlet of the ion exchanger group is connected to the return water outlet of the synchronous condenser rotor water tank. The return water outlet of the synchronous condenser rotor water tank is provided with a return water pipe. The return water pipe is provided with a first connection port, a second connection port, and a third connection port in sequence along the return water direction. The first connection port is connected to the outlet of the ion exchanger group. The second connection port is connected to the fresh water outlet of the purification membrane device. The third connection port is connected to the alkali tank.

[0014] The control system adjusts the outlet flow rate of the camera condenser rotor water tank according to the quality of the cooling water in the camera condenser rotor water tank; the control system adjusts the freshwater outlet flow rate of the purification membrane device according to the conductivity of the mixed water from the freshwater outlet of the purification membrane device and the outlet water of the ion exchanger group; the control system adjusts the flow rate of the alkali tank according to the return water conductivity of the camera condenser rotor water tank.

[0015] Preferably, in the above-mentioned intelligent treatment device for regulating the cooling water quality inside the rotor of the condenser, there are two purification membrane devices arranged in parallel; and two ion exchanger groups are arranged in parallel, with each ion exchanger group consisting of two or more ion exchangers connected in series.

[0016] Preferably, in the intelligent treatment device for regulating the cooling water quality inside the rotor of the aforementioned synchronous condenser, the outlet of the rotor water tank of the synchronous condenser is provided with an outlet pipe, the outlet pipe includes a main pipe and two branch pipes, the two branch pipes are respectively connected to two purification membrane devices, the main pipe is provided with a pipe filter, a pH meter and a conductivity meter, and each of the branch pipes is provided with a water supply pump and an electric regulating valve.

[0017] Each of the purification membrane devices is equipped with a freshwater outlet pipe at its freshwater outlet, and each freshwater outlet pipe is equipped with an electric regulating valve.

[0018] The concentrate outlets of the two purification membrane devices are connected to the inlets of the two ion exchanger groups through a concentrate outlet pipe. The concentrate outlet pipe includes two concentrate branch pipes I, one concentrate main pipe, and two concentrate branch pipes II arranged sequentially along the water flow direction. The concentrate outlets of the two purification membrane devices are respectively connected to the two concentrate branch pipes I, and the two concentrate branch pipes II are respectively connected to the inlets of the two ion exchanger groups. Valves are provided on the concentrate main pipe and the two concentrate branch pipes II.

[0019] The outlets of the two sets of ion exchanger groups are connected to the first connection port of the return water pipe through an ion exchanger group outlet pipe. The ion exchanger group outlet pipe includes two ion exchanger group outlet branch pipes and one ion exchanger group outlet main pipe. The outlets of the two sets of ion exchanger groups are respectively connected to the two ion exchanger group outlet branch pipes. The ion exchanger group outlet main pipe is connected to the first connection port of the return water pipe. The ion exchanger group outlet main pipe is equipped with a pipe filter, valve, pH meter and conductivity meter.

[0020] Preferably, in the intelligent treatment device for regulating the cooling water quality inside the synchronous condenser rotor described above, a conductivity meter is provided between the second and third connection ports of the return water pipe, and a pipe mixer, a pipe filter, a conductivity meter, and a pH meter are sequentially provided along the return water direction between the third connection port of the return water pipe and the return water port of the synchronous condenser rotor water tank; the outlet of the alkali tank is connected to the third connection port of the return water pipe through an outlet pipe, and a dosing pump and a valve are provided on the outlet pipe.

[0021] Preferably, in the intelligent processing device for regulating the cooling water quality inside the rotor of the aforementioned synchronous condenser, the conductivity meter on the outlet pipe is connected to the input terminal of the control system, and the electric regulating valves on the two branch pipes of the outlet pipe are connected to the output terminal of the control system.

[0022] The conductivity meter between the second and third connection ports of the return water pipe is connected to the input terminal of the control system, and the electric regulating valve on each fresh water outlet pipe is connected to the output terminal of the control system.

[0023] The conductivity meter between the third connection port of the return water pipe and the return water port of the synchronous condenser rotor water tank is connected to the input terminal of the control system, and the dosing pump on the outlet pipe is connected to the output terminal of the control system.

[0024] Compared with the prior art, the advantages of the present invention are as follows:

[0025] 1. This invention employs a purification membrane to separate ions of different valence states, uses ion exchange resin to remove ionic impurities from the rotor's internal cooling water, and then adds a trace amount of alkaline solution. The selective ion separation of the purification membrane allows for the retention of some monovalent ions (mainly sodium ions) in the rotor's internal cooling water that do not need to be removed, reducing the amount of ion exchange resin required and extending its lifespan. Simultaneously, the ion exchange resin effectively removes various ions from the concentrated ion solution of the purification membrane, ensuring that impurities in the rotor's internal cooling water, namely H₂CO₃ and CO₃²⁻, are completely removed. 2- and HCO3 - Ion concentration less than 1×10 -7 The addition of trace amounts of alkaline solution (such as sodium hydroxide solution) at a concentration of mol / L can raise the pH of the return water from the rotor water tank of the condenser to 9.0, while maintaining a conductivity below 3.5 μS / cm. This creates a low-conductivity, high-pH system for the rotor cooling water, ensuring that the rotor cooling water in the system is consistently maintained at a pH of 8.0–9.0, a copper ion content ≤20 μg / L, and a conductivity less than 3.0 μS / cm, thus meeting the water quality requirements. This low-conductivity, high-pH system results in low ionic impurities in the rotor cooling water, requires less alkaline solution addition, less ion exchange resin treatment, and a longer ion exchange resin lifespan. Ultimately, this achieves excellent water quality control of the rotor cooling water, with a long ion exchange resin lifespan and zero discharge.

[0026] 2. The device of the present invention employs a control system that adjusts the outlet flow rate of the condenser rotor water tank according to the water quality (such as conductivity) of the cooling water inside the condenser rotor. It also adjusts the freshwater outlet flow rate of the purification membrane device according to the conductivity of the mixed water from the freshwater outlet of the purification membrane device and the outlet of the ion exchanger group. Furthermore, it adjusts the flow rate (output of the dosing pump) of the alkali tank according to the conductivity of the return water from the condenser rotor water tank. This achieves intelligent automatic control of the cooling water quality inside the rotor, and water quality fluctuations or abnormalities can be automatically adjusted by the control system. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the water circuit of the intelligent treatment device for adjusting the cooling water quality inside the synchronous condenser rotor in Embodiment 1 of the present invention.

[0028] Legend:

[0029] 1. Phase converter rotor water tank; 2. Purification membrane device; 3. Ion exchanger group; 4. Alkali tank; 5. Control system; 6. Return water pipe; 7. Ion exchanger; 8. Outlet water pipe; 9. Pipeline filter; 10. pH meter; 11. Conductivity meter; 12. Dosing pump; 13. Feed water pump; 14. Electric regulating valve; 15. Fresh water outlet pipe; 16. Concentrate outlet pipe; 17. Valve; 18. Ion exchanger group outlet pipe; 19. Pipeline mixer; 20. Liquid outlet pipe. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention. The materials and instruments used in the following embodiments are all commercially available, and the control system is a Siemens STEP7-MicroWIN SMART (S7-1200).

[0031] Example 1

[0032] A method for adjusting the cooling water quality of the rotor of a synchronous condenser according to the present invention includes the following steps: the cooling water inside the rotor of the synchronous condenser is bypassed and first passed through a purification membrane to obtain fresh water and concentrated water. The fresh water is internal cooling water with solid particulate matter, divalent and higher ions and some monovalent ions removed. The concentrated water is treated through an ion exchange resin to further completely remove ions to obtain deionized internal cooling water. The fresh water and deionized internal cooling water are mixed and alkali solution is added and returned to the cooling water system inside the rotor of the synchronous condenser to achieve water quality adjustment.

[0033] In this embodiment, the flow rate of the cooling water bypass treatment inside the synchronous condenser rotor is controlled within 4.0 m³ / s. 3 / h~5.0m 3 / h, in this embodiment, it is controlled at 4.5m 3 / h.

[0034] In this embodiment, the purification membrane is a selective ion filter membrane, which meets the following requirements: filtering all particulate matter, with a removal rate of divalent and higher ions greater than 97%, and a removal rate of monovalent ions of 45% to 50%. Specifically, this embodiment uses a polyamide membrane with a pore size of 0.5 nm.

[0035] Ion exchange resin is placed in ion exchanger 7, which is a mixed bed composed of anion and cation exchange resins. The conductivity of the effluent from ion exchanger 7 is less than 0.08 μS / cm, and in this embodiment it is controlled to be less than 0.05 μS / cm.

[0036] In this embodiment, before adding the alkali solution, the conductivity of the mixed water of fresh water and deionized internal cooling water is controlled between 0.15 μS / cm and 0.30 μS / cm, and in this embodiment it is controlled at 0.20 μS / cm.

[0037] In this embodiment, the amount of alkali added is controlled such that the conductivity of the mixture of fresh water and deionized internal cooling water after adding alkali is 3.2 μS / cm to 3.5 μS / cm, and in this embodiment it is controlled to be 3.4 μS / cm.

[0038] A smart processing device for regulating the cooling water quality inside the rotor of a synchronous condenser according to the present invention is shown in the schematic diagram of its water circuit. Figure 1As shown, the device includes a condenser rotor water tank 1, a purification membrane device 2, an ion exchanger group 3, an alkali tank 4, and a control system 5. The condenser rotor water tank 1 is provided with an outlet and a return water outlet. The purification membrane device 2 is provided with an inlet, a fresh water outlet, and a concentrated water outlet. The outlet of the condenser rotor water tank 1 is connected to the inlet of the purification membrane device 2. The fresh water outlet of the purification membrane device 2 is connected to the return water outlet of the condenser rotor water tank 1. The concentrated water outlet of the purification membrane device 2 is connected to the inlet of the ion exchanger group 3. The outlet of the ion exchanger group 3 is connected to the return water outlet of the condenser rotor water tank 1. The return water outlet of the condenser rotor water tank 1 is provided with a return water pipe 6. The return water pipe 6 is provided with a first connection port, a second connection port, and a third connection port in sequence along the return water direction. The first connection port is connected to the outlet of the ion exchanger group 3. The second connection port is connected to the fresh water outlet of the purification membrane device 2. The third connection port is connected to the alkali tank 4.

[0039] The control system 5 adjusts the outlet flow rate of the condenser rotor water tank 1 according to the water quality of the cooling water inside the condenser rotor in the condenser rotor water tank 1; the control system 5 adjusts the fresh water outlet flow rate of the purification membrane device 2 according to the conductivity of the mixed water of the fresh water outlet of the purification membrane device 2 and the water outlet of the ion exchanger group 3; the control system 5 adjusts the flow rate of the alkali tank 4 according to the return water conductivity of the condenser rotor water tank 1.

[0040] In this embodiment, there are two purification membrane devices 2 arranged side by side; there are two ion exchanger groups 3 arranged side by side, and each ion exchanger group 3 is composed of two or more ion exchangers 7 connected in series.

[0041] In this embodiment, the outlet of the condenser rotor water tank 1 is provided with an outlet pipe 8. The outlet pipe 8 includes a main pipe and two branch pipes. The two branch pipes are respectively connected to two purification membrane devices 2. The main pipe is provided with a pipe filter 9, a pH meter 10 and a conductivity meter 11. Each branch pipe is provided with a water supply pump 13 and an electric regulating valve 14.

[0042] Each purification membrane device 2 has a fresh water outlet pipe 15 at its fresh water outlet, and each fresh water outlet pipe 15 is equipped with an electric regulating valve 14.

[0043] The concentrate outlets of the two purification membrane devices 2 are connected to the inlets of the two ion exchanger groups 3 through a concentrate outlet pipe 16. The concentrate outlet pipe 16 includes two concentrate branch pipes I, one concentrate main pipe and two concentrate branch pipes II arranged sequentially along the water flow direction. The concentrate outlets of the two purification membrane devices 2 are respectively connected to the two concentrate branch pipes I, and the two concentrate branch pipes II are respectively connected to the inlets of the two ion exchanger groups 3. Valves 17 are provided on the concentrate main pipe and the two concentrate branch pipes II.

[0044] The outlets of the two ion exchanger groups 3 are connected to the first connection port of the return water pipe 6 through an ion exchanger group outlet pipe 18. The ion exchanger group outlet pipe 18 includes two ion exchanger group outlet branch pipes and one ion exchanger group outlet main pipe. The outlets of the two ion exchanger groups 3 are respectively connected to the two ion exchanger group outlet branch pipes. The ion exchanger group outlet main pipe is connected to the first connection port of the return water pipe 6. The ion exchanger group outlet main pipe is equipped with a pipe filter 9, a valve 17, a pH meter 10 and a conductivity meter 11.

[0045] In this embodiment, a conductivity meter 11 is provided between the second and third connection ports of the return water pipe 6. A pipe mixer 19, a pipe filter 9, a conductivity meter 11, and a pH meter 10 are sequentially provided along the return water direction between the third connection port of the return water pipe 6 and the return water port of the synchronous condenser rotor water tank 1. The outlet of the alkali tank 4 is connected to the third connection port of the return water pipe 6 through an outlet pipe 20. A dosing pump 12 and a valve 17 are provided on the outlet pipe 20.

[0046] In this embodiment, the conductivity meter 11 on the water outlet pipe 8 is connected to the input terminal of the control system 5, and the electric regulating valve 14 on the two branch pipes of the water outlet pipe 8 is connected to the output terminal of the control system 5.

[0047] The conductivity meter 11 between the second and third connection ports of the return water pipe 6 is connected to the input terminal of the control system 5, and the electric regulating valve 14 on each fresh water outlet pipe 15 is connected to the output terminal of the control system 5.

[0048] The conductivity meter 11 between the third connection port of the return water pipe 6 and the return water port of the synchronous condenser rotor water tank 1 is connected to the input terminal of the control system 5, and the dosing pump 12 on the outlet pipe 20 is connected to the output terminal of the control system 5.

[0049] The working principle and workflow of the device in this embodiment are as follows:

[0050] like Figure 1As shown, the device in this embodiment regulates the quality of the rotor cooling water in the rotor water tank 1 by bypassing the rotor cooling water. The inlet flow rate of the device is automatically adjusted by the control system 5 according to the rotor cooling water quality, automatically increasing and decreasing the inlet flow rate to ensure the required inlet flow rate of the rotor cooling water. For example, if the target rotor cooling water pH is 8.5, and the rotor cooling water pH is less than 8.5 at a certain processing flow rate, the control system adjusts the opening of the outlet valve of the rotor water tank of the condenser according to the difference between the target value and the actual value, increasing the flow rate entering the device for processing. As more rotor cooling water enters the device for processing, more cooling water with higher pH adjusted by alkaline solution returns to the water tank, causing the pH of the rotor water tank of the condenser to rise. Once the pH of the cooling water rises to above 8.5, the inlet flow rate is readjusted to the original value.

[0051] The internal cooling water of the rotor enters the device at a predetermined flow rate, first flowing into the purification membrane device 2. The purification membrane device 2, through its selective permeation separation performance, concentrates solid particles, divalent ions, and some monovalent ions in the concentrated water, thus purifying the desalinated water. The concentrated water from the purification membrane device 2 then enters the ion exchanger group 3. In the ion exchanger group 3, the ion exchange resin removes all ions from the concentrated water through adsorption and exchange. The effluent from the ion exchanger group 3 is mixed with the desalinated water and then returned to the water tank after being mixed with alkali. The control system 5 controls the electric regulating valve 14 at the desalinated water outlet of the purification membrane device 2 based on the conductivity of the mixed water from the ion exchanger group 3, ensuring that impurities in the internal cooling water of the rotor are thoroughly removed as the concentrated water from the purification membrane device 2 enters the ion exchanger 7. If the target controlled mixed water conductivity is 0.20 μS / cm, and water quality fluctuations cause the mixed water conductivity to rise above 0.20 μS / cm, the control system 5 uses PID control to adjust the freshwater outlet electric regulating valve 14, reducing the freshwater flow rate. This allows more impurities in the concentrate to pass through the ion exchanger 7, ensuring low impurity content in the rotor's cooling water. Similarly, when water quality fluctuations cause the mixed water conductivity to drop below 0.20 μS / cm, the control system 5 uses PID control to adjust the freshwater outlet electric regulating valve 14, increasing the freshwater flow rate and reducing the ion exchanger 7's processing capacity, thus extending the ion exchange resin's lifespan. The control system 5 controls the output of the dosing pump 12 based on the return water conductivity of the synchronous condenser rotor water tank 1, ensuring precise alkali solution addition. If the target control is to maintain the return water conductivity of the synchronous condenser rotor water tank 1 at 3.4 μS / cm, and if the return water conductivity of the synchronous condenser rotor water tank 1 is greater than or less than 3.4 μS / cm, the control system 5 will use PID control to reduce or increase the amount of alkali added, thereby stabilizing the return water conductivity of the synchronous condenser rotor water tank 1 at 3.4 μS / cm.

[0052] Through the above control, the pH value of the internal cooling water of the rotor is 8.4-8.6, the copper ion content is 20μg / L, the conductivity is 2.7-3.0μS / cm, and the lifespan of the ion exchange resin reaches more than 1.5 years, which is more than twice that of the existing technology. Moreover, the operation and maintenance of the entire device is more intelligent and the workload and cost of operation and maintenance are lower than those of the existing technology.

[0053] In the above embodiments, the method and apparatus of the present invention can effectively regulate the cooling water inside the rotor to form a low conductivity, high pH rotor cooling water system. The rotor cooling water quality is controlled as follows: pH value 8.4–8.6, copper ion content 20 μg / L, conductivity 2.7–3.0 μS / cm, and the ion exchange resin lifespan reaches more than 1.5 years. Furthermore, the intelligent treatment device can intelligently control the rotor cooling water quality, possessing advantages such as low maintenance workload, zero wastewater discharge, high safety and reliability, and excellent economy.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the spirit and technical essence of the present invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall still fall within the protection scope of the technical solutions of the present invention.

Claims

1. A method for adjusting the cooling water quality inside the rotor of a condenser, characterized in that, The process includes the following steps: bypassing the cooling water inside the synchronous condenser rotor, first passing it through a purification membrane to obtain fresh water and concentrated water. The fresh water is internal cooling water with solid particulate matter, divalent and higher ions and some monovalent ions removed. The concentrated water is then treated with an ion exchange resin to further completely remove ions, resulting in deionized internal cooling water. The fresh water and the deionized internal cooling water are mixed and alkali solution is added before being returned to the cooling water system inside the synchronous condenser rotor to achieve water quality regulation. The flow rate of the cooling water bypass treatment inside the synchronous condenser rotor is controlled within 4.0 m³ / s. 3 / h~5.0m 3 / h; The purification membrane is a selective ion filter membrane, which meets the following requirements: filters all particulate matter, with a removal rate of divalent ions greater than 97% and a removal rate of monovalent ions of 45% to 50%. The ion exchange resin is disposed in the ion exchanger (7), the ion exchanger (7) is a mixed bed composed of anion and cation exchange resins, and the effluent conductivity of the ion exchanger (7) is less than 0.08 μS / cm. Before adding the alkali solution, the conductivity of the mixed water of the fresh water and the deionized internal cooling water is controlled between 0.15 μS / cm and 0.30 μS / cm. The amount of alkali solution added is controlled such that the conductivity of the mixture of fresh water and deionized internal cooling water after adding the alkali solution is 3.2 μS / cm to 3.5 μS / cm.

2. The method for adjusting the cooling water quality inside the rotor of a synchronous condenser according to claim 1, characterized in that, The method is implemented using an intelligent treatment device for regulating the cooling water quality inside the condenser rotor. This device includes a condenser rotor water tank (1), a purification membrane device (2), an ion exchanger group (3), an alkali tank (4), and a control system (5). The condenser rotor water tank (1) has an outlet and a return outlet. The purification membrane device (2) has an inlet, a freshwater outlet, and a concentrated water outlet. The outlet of the condenser rotor water tank (1) is connected to the inlet of the purification membrane device (2), and the freshwater outlet of the purification membrane device (2) is connected to the outlet of the condenser rotor water tank (1). The return water outlet is connected to the concentrated water outlet of the purification membrane device (2) and the inlet of the ion exchanger group (3). The outlet of the ion exchanger group (3) is connected to the return water outlet of the condenser rotor water tank (1). The return water outlet of the condenser rotor water tank (1) is provided with a return water pipe (6). The return water pipe (6) is provided with a first connection port, a second connection port and a third connection port in sequence along the return water direction. The first connection port is connected to the outlet of the ion exchanger group (3), the second connection port is connected to the fresh water outlet of the purification membrane device (2), and the third connection port is connected to the alkali tank (4). The control system (5) adjusts the outlet flow rate of the camera rotor water tank (1) according to the cooling water quality of the camera rotor in the camera rotor water tank (1); the control system (5) adjusts the fresh water outlet flow rate of the purification membrane device (2) according to the conductivity of the mixed water of the fresh water outlet of the purification membrane device (2) and the water outlet of the ion exchanger group (3); the control system (5) adjusts the flow rate of the alkali tank (4) according to the return water conductivity of the camera rotor water tank (1).

3. The method for adjusting the cooling water quality inside the rotor of a synchronous condenser according to claim 2, characterized in that, The purification membrane device (2) is provided in two, and the two purification membrane devices (2) are arranged in parallel; the ion exchanger group (3) is provided in two, and the two ion exchanger groups (3) are arranged in parallel, and each ion exchanger group (3) is composed of two or more ion exchangers (7) connected in series.

4. The method for adjusting the cooling water quality inside the rotor of a synchronous condenser according to claim 2, characterized in that, The outlet of the condenser rotor water tank (1) is provided with an outlet pipe (8). The outlet pipe (8) includes a main pipe and two branch pipes. The two branch pipes are respectively connected to two purification membrane devices (2). The main pipe is provided with a pipe filter (9), a pH meter (10) and a conductivity meter (11). Each of the branch pipes is provided with a water pump (13) and an electric regulating valve (14). Each of the purification membrane devices (2) is provided with a fresh water outlet pipe (15) at its fresh water outlet, and each fresh water outlet pipe (15) is provided with an electric regulating valve (14). The concentrated water outlets of the two purification membrane devices (2) are connected to the inlets of the two sets of ion exchanger groups (3) through a concentrated water outlet pipe (16). The concentrated water outlet pipe (16) includes two concentrated water branch pipes I, one concentrated water main pipe and two concentrated water branch pipes II arranged sequentially along the water flow direction. The concentrated water outlets of the two purification membrane devices (2) are respectively connected to the two concentrated water branch pipes I, and the two concentrated water branch pipes II are respectively connected to the inlets of the two sets of ion exchanger groups (3). Valves (17) are provided on the concentrated water main pipe and the two concentrated water branch pipes II. The outlets of the two sets of ion exchanger groups (3) are connected to the first connection port of the return water pipe (6) through an ion exchanger group outlet pipe (18). The ion exchanger group outlet pipe (18) includes two ion exchanger group outlet branch pipes and one ion exchanger group outlet main pipe. The outlets of the two sets of ion exchanger groups (3) are respectively connected to the two ion exchanger group outlet branch pipes. The ion exchanger group outlet main pipe is connected to the first connection port of the return water pipe (6). The ion exchanger group outlet main pipe is equipped with a pipe filter (9), a valve (17), a pH meter (10) and a conductivity meter (11).

5. The method for adjusting the cooling water quality inside the rotor of a synchronous condenser according to claim 4, characterized in that, A conductivity meter (11) is provided between the second and third connection ports of the return water pipe (6). A pipe mixer (19), a pipe filter (9), a conductivity meter (11), and a pH meter (10) are sequentially provided between the third connection port of the return water pipe (6) and the return water port of the condenser rotor water tank (1) along the return water direction. The outlet of the alkali tank (4) is connected to the third connection port of the return water pipe (6) through an outlet pipe (20). A dosing pump (12) and a valve (17) are provided on the outlet pipe (20).

6. The method for adjusting the cooling water quality inside the rotor of a synchronous condenser according to claim 5, characterized in that, The conductivity meter (11) on the water outlet pipe (8) is connected to the input end of the control system (5), and the electric regulating valve (14) on the two branch pipes of the water outlet pipe (8) is connected to the output end of the control system (5). The conductivity meter (11) between the second and third connection ports of the return water pipe (6) is connected to the input end of the control system (5), and the electric regulating valve (14) on each fresh water outlet pipe (15) is connected to the output end of the control system (5). The conductivity meter (11) between the third connection port of the return water pipe (6) and the return water port of the condenser rotor water tank (1) is connected to the input end of the control system (5), and the dosing pump (12) on the outlet pipe (20) is connected to the output end of the control system (5).

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