Mixed bed system and water treatment method

Abstract

The invention discloses a mixed bed system and a water treatment method, and the mixed bed system comprises a mixed bed which is used for treating water to be purified to obtain high-purity water; the first water storage tank is used for providing water to be purified for the mixed bed, and the first water storage tank is provided with a first water outlet; the stop valve is arranged on a water pipe channel between the first water storage tank and the mixed bed and is used for controlling water to be purified to enter the mixed bed; the variable frequency water pump is arranged on a water pipe channel between the first water outlet and the stop valve and is used for adjusting the flow of the to-be-purified water; the second water storage tank is used for storing the high-purity water and providing the high-purity water for a back-end process, and the second water storage tank is provided with a liquid level meter; the control system comprises a liquid level control unit, the liquid level control unit comprises a liquid level obtaining module and a variable frequency water pump control module, the liquid level obtaining module is used for obtaining the liquid level of the second water storage tank from the liquid level meter, and the variable frequency water pump control module is used for monitoring the liquid level in real time and controlling the frequency of the variable frequency water pump according to the liquid level. And the quality of water produced by the mixed bed is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to a mixed bed system and a water treatment method. Background Art

[0002] Mixed bed is usually used as a deep desalination equipment after reverse osmosis or electrodialysis desalination process. The mixed bed is filled with cation exchange resin and anion exchange resin. The two resins are put into operation after regeneration and full mixing. 2+ Mg 2+ The cations and H + Exchange, while Cl - and SO4 2- Anions and OH in anionic resin - The exchange is carried out so that the anions and cations in the influent are removed and the replaced H + and OH - Combined into water molecules, thus producing high-purity pure water with a resistivity of over 15MΩ·cm.

[0003] However, the water quality obtained by the existing mixed bed water treatment still needs to be further improved. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a mixed bed system and a water treatment method to improve the quality of produced water.

[0005] In order to solve the above technical problems, the technical solution of the present invention provides a mixed bed system, including: a mixed bed, used to process the water to be purified to obtain high-purity water, the mixed bed includes a water inlet valve and a water production valve, the water inlet valve is used to control the water to be purified to enter the mixed bed, and the water production valve is used to control the high-purity water to flow out of the mixed bed; a first water storage tank is used to provide the water to be purified to the mixed bed, the first water storage tank has a first water outlet; a cut-off valve is arranged on the water pipe channel between the first water storage tank and the mixed bed, and is used to control the water to be purified to enter the mixed bed; a variable frequency water pump is set Placed on the water pipe channel between the first water outlet and the shut-off valve, it is used to adjust the flow rate of the water to be purified; a second water storage tank is used to store the high-purity water and provide the high-purity water to the back-end process, and the second water storage tank is provided with a liquid level gauge; a control system includes a liquid level control unit, and the liquid level control unit includes: a liquid level acquisition module and a variable frequency water pump control module, the liquid level acquisition module is used to obtain the liquid level of the second water storage tank from the liquid level gauge, and the variable frequency water pump control module is used to monitor the liquid level in real time and control the frequency of the variable frequency water pump according to the liquid level.

[0006] Optionally, the mixed bed system also includes: a resistivity meter for measuring the resistivity value of the high-purity water; the control system also includes a resistivity control unit, and the resistivity control unit includes: a resistivity acquisition module for acquiring the resistivity value from the resistivity meter; a resistivity control module for monitoring the resistance value in real time and controlling the mixed bed according to the resistivity value, when the resistivity value is lower than a preset resistivity value, the mixed bed system is switched to a standby mixed bed, and the mixed bed with failed control enters a dosing regeneration program.

[0007] Optionally, the second water storage tank is also provided with a pressure sensor; the control system also includes an air pressure control unit, which includes: an air pressure acquisition module, used to obtain the air pressure in the second water storage tank from the pressure sensor; an air pressure control module, used to monitor the air pressure in real time, and control the air pressure in the second water storage tank according to the change of the air pressure to maintain it within a preset air pressure range.

[0008] Optionally, the second water tank is also provided with an air inlet valve and an air drain valve; the air pressure control module is used to open the air inlet valve to inflate the second water tank when the air pressure is lower than the first preset air pressure, and to open the air drain valve to exhaust air to the outside of the second water tank to reduce the pressure inside the second water tank when the air pressure is greater than the second preset air pressure.

[0009] Optionally, the first water storage tank also has a first return water port; the mixed bed system also includes: a reflux valve, which is arranged on the water pipe channel between the first return water port and the cut-off valve; the liquid level control unit also includes: a liquid level control module, which is used to monitor the liquid level in real time and control the switches of the cut-off valve and the reflux valve according to the liquid level. When the liquid level reaches or exceeds the liquid level warning value, the cut-off valve is closed and the reflux valve is opened to control the liquid level of the second water storage tank within a preset liquid level range.

[0010] Optionally, the mixed bed system also includes: a first heat exchanger arranged between the variable frequency water pump and the first water storage tank; the control system also includes a first water temperature control unit, the first water temperature control unit includes: a first water temperature acquisition module, used to obtain the first water temperature of the water to be purified; a first water temperature control module, used to monitor the first water temperature in real time, and control the heat source flow or cold source flow of the first heat exchanger according to the first water temperature.

[0011] Optionally, the mixed bed system also includes: a second heat exchanger arranged between the second water storage tank and the back-end process; the control system also includes a second water temperature control unit, the second water temperature control unit includes: a second water temperature acquisition module, used to obtain the second water temperature of the high-purity water; a second water temperature control module, used to monitor the second water temperature in real time, and control the heat source flow or cold source flow of the second heat exchanger according to the second water temperature.

[0012] Optionally, the control system includes a programmable logic controller system.

[0013] Optionally, the liquid level meter includes an ultrasonic liquid level meter.

[0014] Correspondingly, the technical solution of the present invention also provides a water treatment method, including: providing a mixed bed system, the mixed bed system including: a mixed bed, used to process the water to be purified to obtain high-purity water, the mixed bed including a water inlet valve and a water production valve, the water inlet valve is used to control the water to be purified to enter the mixed bed, and the water production valve is used to control the high-purity water to flow out of the mixed bed; a first water storage tank, used to provide the water to be purified to the mixed bed, the first water storage tank has a first water outlet; a cut-off valve, arranged on the water pipe channel between the first water storage tank and the mixed bed, used to control the water to be purified to enter the mixed bed; a variable frequency water pump, arranged on the water pipe channel between the first water outlet and the cut-off valve, used to adjust the flow rate of the water to be purified; a second water storage tank, used to store the high-purity water and provide the high-purity water to the back-end process, the second water storage tank is provided with a liquid level gauge; the liquid level of the second water storage tank is obtained from the liquid level gauge; the liquid level is monitored in real time, and the frequency of the variable frequency water pump is controlled according to the liquid level.

[0015] Optionally, the mixed bed system also includes: a resistivity meter for measuring the resistivity value of the high-purity water; the method also includes: providing a preset resistivity value; obtaining the resistivity value from the resistivity meter; monitoring the resistance value in real time, and controlling the mixed bed according to the resistivity value, when the resistivity value is lower than the preset resistivity value, switching the mixed bed system to a standby mixed bed, and the mixed bed with failed control enters a dosing regeneration program.

[0016] Optionally, the second water storage tank is also provided with a pressure sensor; the method further comprises: providing a preset range of air pressure; obtaining the air pressure in the second water storage tank from the pressure sensor; monitoring the air pressure in real time, and controlling the air pressure in the second water storage tank according to the change of the air pressure to maintain it within the preset range of air pressure.

[0017] Optionally, the second water storage tank is also provided with an air inlet valve and an air drain valve; the lower limit of the preset air pressure range is the first preset air pressure, and the upper limit is the second preset air pressure; the method further includes: when the air pressure is lower than the first preset air pressure, opening the air inlet valve to inflate the second water storage tank; when the air pressure is greater than the second preset air pressure, opening the air drain valve to exhaust air to the outside of the second water storage tank to reduce the pressure in the second water storage tank.

[0018] Optionally, the first water storage tank also has a first water return port; the mixed bed system also includes: a reflux valve, which is arranged on the water pipe channel between the first water return port and the cut-off valve; the method also includes: providing a liquid level warning value; monitoring the liquid level in real time, and controlling the switches of the cut-off valve and the reflux valve according to the liquid level, when the liquid level reaches or exceeds the liquid level warning value, closing the cut-off valve and opening the reflux valve to control the liquid level of the second water storage tank within a preset liquid level range.

[0019] Optionally, the mixed bed system also includes: a first heat exchanger arranged between the variable frequency water pump and the first water storage tank; the method also includes: obtaining a first water temperature of the water to be purified; monitoring the first water temperature in real time, and controlling the heat source flow or cold source flow of the first heat exchanger according to the first water temperature.

[0020] Optionally, the mixed bed system also includes: a second heat exchanger arranged between the second water storage tank and the back-end process; the method also includes: obtaining a second water temperature of the high-purity water; monitoring the second water temperature in real time, and controlling the heat source flow or cold source flow of the second heat exchanger according to the second water temperature.

[0021] Optionally, the method further includes: using a programmable logic controller system to obtain the liquid level of the second water tank from the liquid level meter; using a programmable logic controller system to monitor the liquid level in real time, and controlling the frequency of the variable frequency water pump according to the liquid level.

[0022] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0023] In the mixed bed system provided by the technical solution of the present invention, a control system is introduced, wherein a liquid level acquisition module is used to obtain the liquid level of the second water storage tank from a liquid level meter, and a variable frequency water pump control module is used to monitor the liquid level in real time and control the frequency of the variable frequency water pump according to the liquid level, so that the liquid level of the second water storage tank can be controlled in real time, and then the air pressure in the second water storage tank can be controlled to reduce the fluctuation of the air pressure, thereby reducing the probability of the high-purity water stored in the second water storage tank contacting the air, thereby reducing the pollution of the high-purity water and improving the water quality of the produced water; in addition, the method of controlling the liquid level of the second water storage tank in real time can keep the mixed bed in a water producing state, thereby helping to improve the water quality of the mixed bed output, and when the mixed bed is a regenerated mixed bed, the service life of the mixed bed after a single regeneration can be increased.

[0024] Furthermore, the control system also monitors the resistance value in real time and controls the mixed bed according to the resistivity value. When the resistivity value is lower than the preset resistivity value, the mixed bed system is switched to the standby mixed bed, and the mixed bed with failed control enters the dosing regeneration program to improve the output water quality and reduce the adverse effects on the water quality due to the untimely regeneration process of the mixed bed.

[0025] Furthermore, the control system also monitors the air pressure in real time, and controls the air pressure in the second water storage tank according to the change of the air pressure, so as to maintain it within a preset air pressure range, so as to maintain the stability of the air pressure in the second water storage tank, reduce the probability of the high-purity water stored in the second water storage tank contacting the air, thereby reducing the pollution of the high-purity water, improving the water quality of the produced water, and reducing the probability of the second water storage tank being damaged due to siphoning.

[0026] Furthermore, the control system also monitors the liquid level in real time, and controls the switching of the cut-off valve and the reflux valve according to the liquid level, thereby reducing the abnormal phenomenon of water tank overflow caused by the liquid level in the second water storage tank being too high.

[0027] Furthermore, the control system also monitors the first water temperature in real time, and controls the heat source flow or cold source flow of the first heat exchanger according to the first water temperature to control the temperature of the water to be purified. When the mixed bed is used for water treatment, the sufficiency of the reaction between impurities in the water to be purified and the ion exchange resin is improved, thereby further improving the quality of produced water.

[0028] Furthermore, the control system also monitors the second water temperature in real time, and controls the heat source flow or cold source flow of the second heat exchanger according to the second water temperature, so as to control the temperature of the high-purity water and provide a suitable water temperature for the back-end process.

[0029] In the water treatment method provided by the technical solution of the present invention, the liquid level of the second water storage tank is obtained from the liquid level meter, the liquid level is monitored in real time, and the frequency of the variable frequency water pump is controlled according to the liquid level, so that the liquid level of the second water storage tank can be controlled in real time, and then the air pressure in the second water storage tank is controlled to reduce the fluctuation of the air pressure, thereby reducing the probability of the high-purity water stored in the second water storage tank contacting the air, thereby reducing the pollution of the high-purity water and improving the water quality of the produced water; in addition, the method of controlling the liquid level of the second water storage tank in real time can keep the mixed bed in a water producing state, which is beneficial to improving the water quality of the mixed bed output, and when the mixed bed is a regenerated mixed bed, the service life of the mixed bed after a single regeneration can be increased.

[0030] Furthermore, the resistance value is monitored in real time, and the mixed bed is controlled according to the resistivity value. When the resistivity value is lower than the preset resistivity value, the mixed bed system is switched to the standby mixed bed, and the failed mixed bed is controlled to enter the dosing regeneration program to improve the output water quality and reduce the adverse effects on the water quality due to the untimely regeneration process of the mixed bed.

[0031] Furthermore, the air pressure is monitored in real time, and the air pressure in the second water storage tank is controlled according to the change of the air pressure to maintain it within a preset range of the air pressure, so as to maintain the stability of the air pressure in the second water storage tank, reduce the probability of the high-purity water stored in the second water storage tank contacting the air, thereby reducing the pollution of the high-purity water, improving the quality of the produced water, and reducing the probability of the second water storage tank being damaged due to siphoning.

[0032] Furthermore, the liquid level is monitored in real time, and the switches of the cut-off valve and the reflux valve are controlled according to the liquid level, so as to reduce the abnormal phenomenon of water tank overflow caused by the liquid level in the second water storage tank being too high.

[0033] Furthermore, the first water temperature is monitored in real time, and the heat source flow or cold source flow of the first heat exchanger is controlled according to the first water temperature to control the temperature of the water to be purified. When the mixed bed is used for water treatment, the sufficiency of the reaction between the impurities in the water to be purified and the ion exchange resin is improved, thereby further improving the quality of the produced water.

[0034] Furthermore, the second water temperature is monitored in real time, and the heat source flow or cold source flow of the second heat exchanger is controlled according to the second water temperature to control the temperature of the high-purity water and provide a suitable water temperature for the back-end process. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 and Figure 2 It is a schematic structural diagram of a mixed bed system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The water quality obtained by the existing mixed bed water treatment still needs to be further improved. Now we will explain and analyze it in combination with a mixed bed system.

[0037] When the existing mixed bed system is performing water treatment, the high-purity water obtained is usually stored in the water production tank for use in the back-end process. However, the demand for water in the back-end process is usually unstable. When the demand for water in the back-end process is low, the mixed bed will stop producing water to avoid the water production tank liquid level being too high due to excessive water production, thereby causing the mixed bed to be in an intermittent water production state. In addition, due to the unstable demand for high-purity water in the back-end process, the liquid level in the water production tank fluctuates, which in turn causes the air pressure in the water production tank to fluctuate, making it easy for the high-purity water stored in the water production tank to contact the air, causing pollution to the high-purity water and reducing the quality of the produced water.

[0038] In order to solve the above problems, the present invention provides a mixed bed system and water treatment method, which are used to obtain the liquid level of the second water storage tank from the liquid level meter, monitor the liquid level in real time, and control the frequency of the variable frequency water pump according to the liquid level, so that the liquid level of the second water storage tank can be controlled in real time, and then the air pressure in the second water storage tank can be controlled to reduce the fluctuation of the air pressure, thereby reducing the probability of the high-purity water stored in the second water storage tank contacting the air, thereby reducing the pollution of the high-purity water and improving the water quality of the produced water; in addition, the method of controlling the liquid level of the second water storage tank in real time can keep the mixed bed in a water producing state, which is beneficial to improving the water quality of the mixed bed output. When the mixed bed is a regenerated mixed bed, the service life of the mixed bed after a single regeneration can be increased.

[0039] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0040] Figure 1 and Figure 2 It is a schematic structural diagram of a mixed bed system according to an embodiment of the present invention.

[0041] Please refer to Figure 1 and Figure 2 , Figure 1 The various devices in the mixed bed system except the control system are shown. Figure 2The control system, its data acquisition method and the control of each device are shown. The mixed bed system includes: a mixed bed 10, which is used to process the water to be purified to obtain high-purity water. The mixed bed 10 includes an inlet valve 101 and a water production valve 102. The inlet valve 101 is used to control the water to be purified to enter the mixed bed 10, and the water production valve 102 is used to control the high-purity water to flow out of the mixed bed 10; a first water storage tank 20, which is used to provide the water to be purified to the mixed bed 10, and the first water storage tank 20 has a first water outlet 201; a cut-off valve 301, which is arranged on the water pipe channel between the first water storage tank 20 and the mixed bed 10, and is used to control the water to be purified to enter the mixed bed 10; a variable frequency water pump 302, which is set Placed on the water pipe channel between the first water outlet 201 and the shut-off valve 301, it is used to adjust the flow rate of the water to be purified; a second water tank 40 is used to store the high-purity water and provide the high-purity water to the back-end process 50, and the second water tank 40 is provided with a liquid level meter 401; a control system 60, including a liquid level control unit 601, the liquid level control unit 601 includes: a liquid level acquisition module 6011 and a variable frequency water pump control module 6012, the liquid level acquisition module 6011 is used to obtain the liquid level of the second water tank 20 from the liquid level meter 401, and the variable frequency water pump control module 6012 is used to monitor the liquid level in real time and control the frequency of the variable frequency water pump 302 according to the liquid level.

[0042] At this point, a control system is introduced into the mixed bed system, wherein the liquid level acquisition module 6011 is used to obtain the liquid level of the second water tank 20 from the liquid level meter 401, and the variable frequency water pump control module 6012 is used to monitor the liquid level in real time and control the frequency of the variable frequency water pump 302 according to the liquid level, so that the liquid level of the second water tank 40 can be controlled in real time, and then the air pressure in the second water tank 40 can be controlled to reduce the fluctuation of the air pressure, thereby reducing the probability of the high-purity water stored in the second water tank 40 contacting the air, thereby reducing the pollution of the high-purity water and improving the water quality of the produced water; in addition, the method of controlling the liquid level of the second water tank 40 in real time can keep the mixed bed 10 in a water producing state, thereby helping to improve the water quality produced by the mixed bed 10, and when the mixed bed 10 is a regenerated mixed bed, the service life of the mixed bed 10 after a single regeneration can be increased.

[0043] More specifically, in order to obtain the high-purity water with a water production resistance greater than or equal to 15 MΩ·CM, and taking the production volume of 2000 m3 per day as an example, in this embodiment, the water production of the mixed bed 10 after one regeneration can be increased from the original 11 days to 14 days.

[0044] The water to be purified includes RO water, that is, water treated by reverse osmosis technology (Reverse Osmosis). In this embodiment, the water to be purified is secondary RO water, which is water treated by a second-level reverse osmosis device (Second-level reverse osmosis device).

[0045] In this embodiment, the mixed bed system further includes: a resistivity measuring instrument 402 ( Figure 1 ), which is not shown in the figure, and is used to measure the resistivity value of the high-purity water.

[0046] In this embodiment, the control system 60 also includes a resistivity control unit 602, which includes: a resistivity acquisition module 6021, used to obtain the resistivity value from the resistivity measuring instrument 402; a resistivity control module 6022, used to monitor the resistance value in real time and control the mixed bed 10 according to the resistivity value. When the resistivity value is lower than the preset resistivity value, the mixed bed system is switched to the standby mixed bed 10, and the mixed bed 10 with failed control enters the dosing regeneration program.

[0047] Here, the resistivity control unit 602 monitors the resistance value in real time, which is beneficial to improving the quality of the produced water and reducing the adverse effects on the water quality due to the untimely regeneration process of the mixed bed.

[0048] In this embodiment, the second water storage tank 40 is further provided with a pressure sensor 403 .

[0049] In this embodiment, the control system 60 also includes an air pressure control unit 603, which includes: an air pressure acquisition module 6031, used to obtain the air pressure in the second water tank 40 from the pressure sensor 403; an air pressure control module 6032, used to monitor the air pressure in real time, and control the air pressure in the second water tank 40 according to the change of the air pressure to maintain it within a preset air pressure range.

[0050] Here, the stability of the air pressure in the second water tank 40 is maintained to reduce the probability of the high-purity water stored in the second water tank 40 contacting the air, thereby reducing the pollution of the high-purity water, improving the quality of the produced water, and reducing the probability of the second water tank being damaged due to siphoning.

[0051] In this embodiment, the second water storage tank 40 is further provided with an air inlet valve 404 and an exhaust valve 405 .

[0052] In this embodiment, the air pressure control module 6032 is used to open the air inlet valve 404 to inflate the second water tank 40 when the air pressure is lower than the first preset air pressure, and to open the drain valve 405 to exhaust air to the outside of the second water tank 40 to reduce the pressure in the second water tank 40 when the air pressure is greater than the second preset air pressure.

[0053] Here, in order to prevent the influence of impurities in the gas on the water quality, the opening of the air inlet valve 404 and filling the second water storage tank 40 with gas includes: filling the second water storage tank 40 with nitrogen.

[0054] In this embodiment, the first water storage tank 20 further has a first water return port 202 .

[0055] In this embodiment, the mixed bed system further includes: a reflux valve 303 , which is arranged on the water pipe channel between the first water return port 202 and the cut-off valve 301 .

[0056] In this embodiment, the liquid level control unit 601 also includes: a liquid level control module 6013, which is used to monitor the liquid level in real time and control the switching of the cut-off valve 301 and the reflux valve 303 according to the liquid level. When the liquid level reaches or exceeds the liquid level warning value, the cut-off valve 301 is closed and the reflux valve 303 is opened to control the liquid level of the second water storage tank 40 within a preset liquid level range.

[0057] Here, the opening and closing of the cut-off valve 301 and the reflux valve 303 are controlled according to the liquid level to reduce the abnormal phenomenon of water tank overflow caused by the liquid level in the second water storage tank 40 being too high.

[0058] In this embodiment, the mixed bed system further includes: a first heat exchanger 304 ( Figure 1 not shown).

[0059] In this embodiment, the control system 60 also includes a first water temperature control unit 604, which includes: a first water temperature acquisition module 6041, used to obtain the first water temperature of the water to be purified; a first water temperature control module 6042, used to monitor the first water temperature in real time, and control the heat source flow or cold source flow of the first heat exchanger 304 according to the first water temperature.

[0060] Here, the heat source flow or cold source flow of the first heat exchanger 304 is controlled to control the temperature of the water to be purified, and when the mixed bed 10 performs water treatment, the sufficiency of the reaction between the impurities in the water to be purified and the ion exchange resin is improved, thereby further improving the quality of the produced water.

[0061] In this embodiment, the mixed bed system further includes: a second heat exchanger 305 ( Figure 1 not shown).

[0062] In this embodiment, the control system 60 also includes a second water temperature control unit 605, which includes: a second water temperature acquisition module 6051, used to obtain the second water temperature of the high-purity water; a second water temperature control module 6052, used to monitor the second water temperature in real time, and control the heat source flow or cold source flow of the second heat exchanger 305 according to the second water temperature.

[0063] Here, the heat source flow rate or the cold source flow rate of the second heat exchanger 305 is controlled to control the temperature of the high-purity water and provide a suitable water temperature for the back-end process 50.

[0064] The control system includes a programmable logic controller system. In this embodiment, the control system is a programmable logic controller (PLC) system.

[0065] The liquid level meter 401 includes an ultrasonic liquid level meter. In this embodiment, the liquid level meter 401 is an ultrasonic liquid level meter. In other embodiments, the liquid level meter can also be other equipment for measuring the liquid level.

[0066] Accordingly, an embodiment of the present invention further provides a water treatment method, please continue to refer to Figure 1 and Figure 2 , including the following steps:

[0067] Step 1: Provide a mixed bed system, the mixed bed system comprising: a mixed bed 10, used to process the water to be purified to obtain high-purity water, the mixed bed 10 comprising an inlet valve 101 and a water production valve 102, the inlet valve 101 is used to control the water to be purified to enter the mixed bed 10, the water production valve 102 is used to control the high-purity water to flow out of the mixed bed 10; a first water storage tank 20, used to provide the water to be purified to the mixed bed 10, the first water storage tank 20 has a first water outlet 20 1; a cut-off valve 301, arranged on the water pipe channel between the first water storage tank 20 and the mixed bed 10, for controlling the water to be purified to enter the mixed bed 10; a variable frequency water pump 302, arranged on the water pipe channel between the first water outlet 201 and the cut-off valve 301, for adjusting the flow rate of the water to be purified; a second water storage tank 40, for storing the high-purity water and providing the high-purity water to the back-end process 50, the second water storage tank 40 is provided with a liquid level meter 401.

[0068] Step 2: Obtain the liquid level of the second water storage tank 40 from the liquid level meter 401.

[0069] In this embodiment, a programmable logic controller system is used to obtain the liquid level of the second water storage tank 40 from the liquid level meter 401 .

[0070] Step three: monitor the liquid level in real time, and control the frequency of the variable frequency water pump 302 according to the liquid level.

[0071] In this embodiment, a programmable logic controller system is used to monitor the liquid level in real time, and the frequency of the variable frequency water pump 302 is controlled according to the liquid level.

[0072] At this point, the liquid level of the second water tank 20 is obtained from the liquid level meter 401, the liquid level is monitored in real time, and the frequency of the variable frequency water pump 302 is controlled according to the liquid level, so that the liquid level of the second water tank 40 can be controlled in real time, and then the air pressure in the second water tank 40 is controlled to reduce the fluctuation of the air pressure, thereby reducing the probability of the high-purity water stored in the second water tank 40 contacting the air, thereby reducing the pollution of the high-purity water and improving the water quality of the produced water; in addition, the method of controlling the liquid level of the second water tank 40 in real time can keep the mixed bed 10 in a water producing state, thereby helping to improve the water quality produced by the mixed bed 10. When the mixed bed 10 is a regenerated mixed bed, the service life of the mixed bed 10 after a single regeneration can be increased.

[0073] More specifically, in order to obtain the high-purity water with a water production resistance greater than or equal to 15 MΩ·CM, and taking the production volume of 2000 m3 per day as an example, in this embodiment, the water production of the mixed bed 10 after one regeneration can be increased from the original 11 days to 14 days.

[0074] The water to be purified includes RO water, that is, water treated by reverse osmosis technology (Reverse Osmosis). In this embodiment, the water to be purified is secondary RO water, which is water treated by a second-level reverse osmosis device (Second-level reverse osmosis device).

[0075] In this embodiment, the mixed bed system further includes: a resistivity measuring instrument 402 ( Figure 1 ), which is not shown in the figure, and is used to measure the resistivity value of the high-purity water.

[0076] In this embodiment, the method further includes: providing a preset resistivity value; obtaining the resistivity value from the resistivity meter; monitoring the resistance value in real time, and controlling the mixed bed 10 according to the resistivity value, and when the resistivity value is lower than the preset resistivity value, switching the mixed bed system to a spare mixed bed 10, and controlling the failed mixed bed 10 to enter a dosing regeneration program.

[0077] Here, the resistivity control unit 602 monitors the resistance value in real time, which is beneficial to improving the quality of the produced water and reducing the adverse effects on the water quality due to the untimely regeneration process of the mixed bed 10 and other reasons.

[0078] It should be noted that the preset resistivity value may be the lower limit of the resistivity required for water used in the back-end process.

[0079] In this embodiment, the second water storage tank 40 is further provided with a pressure sensor 403 .

[0080] In this embodiment, the method also includes: providing a preset air pressure range; obtaining the air pressure in the second water tank 40 from the pressure sensor 403; monitoring the air pressure in real time, and controlling the air pressure in the second water tank 40 according to the change of the air pressure to maintain it within the preset air pressure range.

[0081] Here, the stability of the air pressure in the second water tank 40 is maintained to reduce the probability of the high-purity water stored in the second water tank 40 contacting the air, thereby reducing the pollution of the high-purity water, improving the quality of the produced water, and reducing the probability of the second water tank 40 being damaged due to siphoning.

[0082] In this embodiment, the second water storage tank 40 is further provided with an air inlet valve 404 and an exhaust valve 405 .

[0083] In this embodiment, the lower limit of the preset air pressure range is the first preset air pressure, and the upper limit is the second preset air pressure.

[0084] In this embodiment, when the air pressure is lower than the first preset air pressure, the air inlet valve 404 is opened to inflate the second water tank 40, and when the air pressure is greater than the second preset air pressure, the exhaust valve 405 is opened to exhaust air to the outside of the second water tank 40 to reduce the pressure inside the second water tank 40.

[0085] Here, in order to prevent the influence of impurities in the gas on the water quality, the opening of the air inlet valve 404 and filling the second water storage tank 40 with gas includes: filling the second water storage tank 40 with nitrogen.

[0086] In this embodiment, the first water storage tank 20 further has a first water return port 202 .

[0087] In this embodiment, the mixed bed system further includes: a reflux valve 303 , which is arranged on the water pipe channel between the first water return port 202 and the cut-off valve 301 .

[0088] In this embodiment, the method also includes: providing a liquid level warning value; monitoring the liquid level in real time, and controlling the switching of the cut-off valve 301 and the reflux valve 303 according to the liquid level; when the liquid level reaches or exceeds the liquid level warning value, closing the cut-off valve 301 and opening the reflux valve 303 to control the liquid level of the second water storage tank 40 within a preset liquid level range.

[0089] Here, the opening and closing of the cut-off valve 301 and the reflux valve 303 are controlled according to the liquid level to reduce the abnormal phenomenon of water tank overflow caused by the liquid level in the second water storage tank 40 being too high.

[0090] In this embodiment, the mixed bed system further includes: a first heat exchanger 304 ( Figure 1 not shown).

[0091] In this embodiment, the method further includes: obtaining a first water temperature of the water to be purified; monitoring the first water temperature in real time, and controlling the heat source flow or the cold source flow of the first heat exchanger 304 according to the first water temperature.

[0092] Here, the heat source flow or cold source flow of the first heat exchanger 304 is controlled to control the temperature of the water to be purified, and when the mixed bed 10 performs water treatment, the sufficiency of the reaction between the impurities in the water to be purified and the ion exchange resin is improved, thereby further improving the quality of the produced water.

[0093] In this embodiment, the mixed bed system further includes: a second heat exchanger 305 ( Figure 1 not shown).

[0094] In this embodiment, the method further includes: obtaining a second water temperature of the high-purity water; monitoring the second water temperature in real time, and controlling the heat source flow or the cold source flow of the second heat exchanger 305 according to the second water temperature.

[0095] Here, the heat source flow rate or the cold source flow rate of the second heat exchanger 305 is controlled to control the temperature of the high-purity water and provide a suitable water temperature for the back-end process 50.

[0096] The liquid level meter 401 includes an ultrasonic liquid level meter. In this embodiment, the liquid level meter 401 is an ultrasonic liquid level meter. In other embodiments, the liquid level meter can also be other equipment for measuring the liquid level.

[0097] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A mixed bed system, characterized in that: include: A mixed bed, used for treating the water to be purified to obtain high-purity water, the mixed bed comprising a water inlet valve and a water production valve, the water inlet valve is used to control the water to be purified to enter the mixed bed, and the water production valve is used to control the high-purity water to flow out of the mixed bed; A first water storage tank, used for providing the water to be purified to the mixed bed, the first water storage tank having a first water outlet; A cut-off valve, disposed on the water pipe channel between the first water storage tank and the mixed bed, for controlling the water to be purified to enter the mixed bed; A variable frequency water pump, arranged on the water pipe channel between the first water outlet and the cut-off valve, for adjusting the flow rate of the water to be purified; A second water storage tank is used to store the high-purity water and provide the high-purity water to the back-end process, and the second water storage tank is provided with a liquid level meter; The control system includes a liquid level control unit, which includes: a liquid level acquisition module and a variable frequency water pump control module, the liquid level acquisition module is used to obtain the liquid level of the second water tank from the liquid level meter, and the variable frequency water pump control module is used to monitor the liquid level in real time and control the frequency of the variable frequency water pump according to the liquid level.

2. The mixed bed system according to claim 1, characterized in that: The mixed bed system also includes: a resistivity meter for measuring the resistivity value of the high-purity water; the control system also includes a resistivity control unit, and the resistivity control unit includes: a resistivity acquisition module for acquiring the resistivity value from the resistivity meter; a resistivity control module for real-time monitoring of the resistance value and controlling the mixed bed according to the resistivity value, when the resistivity value is lower than a preset resistivity value, the mixed bed system is switched to a standby mixed bed, and the mixed bed with failed control enters a dosing regeneration program.

3. The mixed bed system according to claim 1, characterized in that: The second water storage tank is also provided with a pressure sensor; the control system also includes an air pressure control unit, which includes: an air pressure acquisition module, used to obtain the air pressure in the second water storage tank from the pressure sensor; an air pressure control module, used to monitor the air pressure in real time and control the air pressure in the second water storage tank according to the change of the air pressure to maintain it within a preset air pressure range.

4. The mixed bed system according to claim 3, characterized in that: The second water storage tank is also provided with an air inlet valve and an air drain valve; the air pressure control module is used to open the air inlet valve to inflate the second water storage tank when the air pressure is lower than the first preset air pressure, and to open the air drain valve to exhaust air out of the second water storage tank to reduce the pressure inside the second water storage tank when the air pressure is greater than the second preset air pressure.

5. The mixed bed system according to claim 1, characterized in that: The first water storage tank also has a first water return port; the mixed bed system also includes: a reflux valve, which is arranged on the water pipe channel between the first water return port and the cut-off valve; the liquid level control unit also includes: a liquid level control module, which is used to monitor the liquid level in real time and control the switches of the cut-off valve and the reflux valve according to the liquid level. When the liquid level reaches or exceeds the liquid level warning value, the cut-off valve is closed and the reflux valve is opened to control the liquid level of the second water storage tank within a preset liquid level range.

6. The mixed bed system according to claim 1, characterized in that: The mixed bed system also includes: a first heat exchanger arranged between the variable frequency water pump and the first water storage tank; the control system also includes a first water temperature control unit, the first water temperature control unit includes: a first water temperature acquisition module, used to obtain the first water temperature of the water to be purified; a first water temperature control module, used to monitor the first water temperature in real time, and control the heat source flow or cold source flow of the first heat exchanger according to the first water temperature.

7. The mixed bed system according to claim 1, characterized in that: The mixed bed system also includes: a second heat exchanger arranged between the second water storage tank and the back-end process; the control system also includes a second water temperature control unit, and the second water temperature control unit includes: a second water temperature acquisition module, used to obtain the second water temperature of the high-purity water; a second water temperature control module, used to monitor the second water temperature in real time, and control the heat source flow or cold source flow of the second heat exchanger according to the second water temperature.

8. The mixed bed system according to claim 1, characterized in that: The control system includes a programmable logic controller system.

9. The mixed bed system according to claim 1, characterized in that: The liquid level meter includes an ultrasonic liquid level meter.

10. A water treatment method, characterized in that: include: A mixed bed system is provided, the mixed bed system comprising: A mixed bed, used for treating the water to be purified to obtain high-purity water, the mixed bed comprising a water inlet valve and a water production valve, the water inlet valve is used to control the water to be purified to enter the mixed bed, and the water production valve is used to control the high-purity water to flow out of the mixed bed; A first water storage tank, used for providing the water to be purified to the mixed bed, the first water storage tank having a first water outlet; A cut-off valve, disposed on the water pipe channel between the first water storage tank and the mixed bed, for controlling the water to be purified to enter the mixed bed; A variable frequency water pump, arranged on the water pipe channel between the first water outlet and the cut-off valve, for adjusting the flow rate of the water to be purified; A second water storage tank is used to store the high-purity water and provide the high-purity water to the back-end process, and the second water storage tank is provided with a liquid level meter; Obtaining the liquid level of the second water storage tank from the liquid level gauge; The liquid level is monitored in real time, and the frequency of the variable frequency water pump is controlled according to the liquid level.

11. The water treatment method according to claim 10, characterized in that: The mixed bed system also includes: a resistivity meter for measuring the resistivity value of the high-purity water; the method also includes: providing a preset resistivity value; obtaining the resistivity value from the resistivity meter; monitoring the resistance value in real time, and controlling the mixed bed according to the resistivity value, when the resistivity value is lower than the preset resistivity value, switching the mixed bed system to a spare mixed bed, and the mixed bed with failed control enters a dosing regeneration program.

12. The water treatment method according to claim 10, characterized in that: The second water storage tank is also provided with a pressure sensor; the method further comprises: providing a preset range of air pressure; obtaining the air pressure in the second water storage tank from the pressure sensor; monitoring the air pressure in real time, and controlling the air pressure in the second water storage tank according to the change of the air pressure to maintain it within the preset range of air pressure.

13. The water treatment method according to claim 12, characterized in that: The second water storage tank is also provided with an air inlet valve and an air drain valve; the lower limit of the preset air pressure range is the first preset air pressure, and the upper limit is the second preset air pressure; the method further includes: when the air pressure is lower than the first preset air pressure, opening the air inlet valve to inflate the second water storage tank, and when the air pressure is greater than the second preset air pressure, opening the air drain valve to exhaust air out of the second water storage tank to reduce the pressure in the second water storage tank.

14. The water treatment method according to claim 10, characterized in that: The first water storage tank also has a first water return port; the mixed bed system also includes: a reflux valve, which is arranged on the water pipe channel between the first water return port and the cut-off valve; the method also includes: providing a liquid level warning value; real-time monitoring of the liquid level, and controlling the switches of the cut-off valve and the reflux valve according to the liquid level, when the liquid level reaches or exceeds the liquid level warning value, closing the cut-off valve and opening the reflux valve to control the liquid level of the second water storage tank within a preset liquid level range.

15. The water treatment method according to claim 10, characterized in that: The mixed bed system also includes: a first heat exchanger arranged between the variable frequency water pump and the first water storage tank; the method also includes: obtaining a first water temperature of the water to be purified; monitoring the first water temperature in real time, and controlling the heat source flow or cold source flow of the first heat exchanger according to the first water temperature.

16. The water treatment method according to claim 10, characterized in that: The mixed bed system also includes: a second heat exchanger arranged between the second water storage tank and the back-end process; the method also includes: obtaining a second water temperature of the high-purity water; monitoring the second water temperature in real time, and controlling the heat source flow or cold source flow of the second heat exchanger according to the second water temperature.

17. The water treatment method according to claim 10, characterized in that: The method further includes: using a programmable logic controller system to obtain the liquid level of the second water storage tank from the liquid level meter; using a programmable logic controller system to monitor the liquid level in real time, and controlling the frequency of the variable frequency water pump according to the liquid level.

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