Ultrapure water equipment

Abstract

The utility model discloses ultrapure water equipment. Comprising a raw water tank, a multi-stage filtering device, a first precision filter, a first booster pump, a first-stage RO main machine, a first pure water tank, a second booster pump, a second-stage RO main machine, a second pure water tank, a first delivery pump, a second precision filter, an EDI device, an ultrapure water tank, a second delivery pump and a polishing mixed bed which are sequentially connected together through pipelines, a waste discharge port of the first-stage RO main machine is connected with the concentrated water tank through a concentrated water pipe, a waste discharge port of the second-stage RO main machine is connected with the raw water tank through a waste water pipe, a concentrated water return pipe is arranged between the concentrated water pipe and the first booster pump, the concentrated water return pipe is connected to a water inlet pipe of the first booster pump, and a return valve is arranged on the concentrated water return pipe; the first-stage RO main machine and the second-stage RO main machine are separately arranged, so that the water pressure of reverse osmosis is ensured, and the water yield of pure water is ensured; the blockage of the membrane is relieved, and the service life of the membrane is prolonged; the pressure of the pure water conveyed to the EDI device is improved, and the water yield of the EDI device is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of pure water treatment technology, and more specifically relates to an ultrapure water device. Background Technology

[0002] To meet the demands of high-precision analytical experiments and the production of ultra-precision components, ultrapure water is required. This means that after the raw water is purified by multiple reverse osmosis modules in the RO unit, it will pass through the EDI unit to further remove electrolyzed ions through electrodialysis and immediate exchange technology to form ultrapure water. However, when the pretreated water passes through the same RO unit multiple times for filtration by reverse osmosis membranes, the lifespan of the reverse osmosis membranes at the front of the RO unit is relatively short due to the large amount of impurities in the water, and is even lower than the normal lifespan of reverse osmosis membranes. Therefore, frequent replacement is required, increasing costs. At the same time, continuous reverse osmosis causes insufficient water pressure in the reverse osmosis modules at the back of the RO unit, which will also lead to a decrease in the inlet water pressure of the EDI unit, resulting in low water production. However, a booster pump is usually not installed before the EDI unit because the instantaneous pressure of the booster pump during startup is too high, which would damage the internal structure of the EDI unit. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides an ultrapure water device that separately sets up a primary RO unit and a secondary RO unit to ensure the reverse osmosis water pressure and the pure water production volume; reduces membrane clogging and extends membrane lifespan; and increases the pressure of pure water supplied to the EDI unit to ensure the EDI unit's water production volume.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an ultrapure water equipment, comprising a raw water tank, a multi-stage filtration device, a first precision filter, a first booster pump, a first-stage RO main unit, a first pure water tank, a second booster pump, a second-stage RO main unit, a second pure water tank, a first transfer pump, a second precision filter, an EDI device, an ultrapure water tank, a second transfer pump, and a polishing mixed bed, all connected sequentially by pipes. The waste outlet of the first-stage RO main unit is connected to the concentrated water tank via a concentrated water pipe, and the waste outlet of the second-stage RO main unit is connected to the raw water tank via a wastewater pipe. A concentrated water return pipe is provided between the concentrated water pipe and the first booster pump, and the concentrated water return pipe is connected to the inlet pipe of the first booster pump. A return valve is provided on the concentrated water return pipe.

[0005] Furthermore, the number of reverse osmosis modules in the primary RO unit is greater than the number of reverse osmosis modules in the secondary RO unit.

[0006] Furthermore, a UV sterilization device is installed between the EDI device and the ultrapure water tank.

[0007] Furthermore, a pure water return pipe is installed on the pipeline between the UV sterilization device and the ultrapure water tank. The pure water return pipe is connected to the second pure water tank, and a valve is installed on the pure water return pipe.

[0008] Furthermore, a TOC sterilization device is provided between the second delivery pump and the polishing mixing bed.

[0009] Furthermore, a 0.22μm filter is installed on the outlet pipe of the polishing mixed bed, and the outlet pipe of the 0.22μm filter is connected to several water points and passes through a pipeline.

[0010] Furthermore, a residual chlorine reduction device is installed on one side of the raw water tank.

[0011] Furthermore, a pH adjustment device is installed on one side of the first pure water tank.

[0012] Furthermore, a bypass pipe is provided between the inlet pipe and the outlet pipe of both the first booster pump and the second booster pump, and a pressure valve is provided on the bypass pipe. A pressure protection switch is provided on both the inlet pipe and the outlet pipe of both the first booster pump and the second booster pump.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: by mixing a certain amount of concentrated water with pretreated water, the water flow rate and feed water volume in the reverse osmosis membrane of the first-stage RO unit are increased, thereby reducing membrane clogging and extending membrane life; by setting up the first-stage RO unit and the second-stage RO unit separately and setting up booster pumps for pressurization, the reverse osmosis water pressure is guaranteed, and the pure water production volume is guaranteed; a first delivery pump is set before the EDI unit to increase the pressure of the pure water supplied to the EDI unit, thereby guaranteeing the water production volume of the EDI unit. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of an ultrapure water device according to the present invention.

[0015] Figure reference numerals: Raw water tank 1; First precision filter 2; First booster pump 3; First-stage RO main unit 4; First pure water tank 5; Second booster pump 6; Second-stage RO main unit 7; Second pure water tank 8; First transfer pump 9; Second precision filter 10; EDI device 11; Ultrapure water tank 12; Second transfer pump 13; Polishing mixed bed 14; Concentrated water pipe 15; Concentrated water tank 16; Wastewater pipe 17; Concentrated water return pipe 18; Return valve 19; Raw water transfer pump 20; Multi-media filter 21; Activated carbon filter 22; Residual chlorine reduction device 23; pH adjustment device 24; Pure water return pipe 25; UV sterilization device 26; TOC sterilization device 27; 0.22μm filter 28. Detailed Implementation

[0016] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0017] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0018] Reference Figure 1 The present invention will be further described below.

[0019] An ultrapure water device includes a raw water tank, a multi-stage filtration device, a first precision filter, a first booster pump, a first-stage RO unit, a first pure water tank, a second booster pump, a second-stage RO unit, a second pure water tank, a first transfer pump, a second precision filter, an EDI device, an ultrapure water tank, a second transfer pump, and a polishing mixed bed, all connected sequentially by pipes. The waste outlet of the first-stage RO unit is connected to the concentrated water tank via a concentrated water pipe, and the waste outlet of the second-stage RO unit is connected to the raw water tank via a wastewater pipe. A concentrated water return pipe is provided between the concentrated water pipe and the first booster pump, and the concentrated water return pipe is connected to the inlet pipe of the first booster pump. A return valve is provided on the concentrated water return pipe.

[0020] like Figure 1As shown, the principle of ultrapure water production by this equipment is as follows: The raw water in the raw water tank first passes through a multi-stage filter and a precision filter to become pre-treated water. After being pressurized by the first booster pump, it enters the first-stage RO host for the first reverse osmosis filtration. The filtered pure water enters the first pure water tank, while the concentrated water is discharged into the concentrated water tank. The pure water in the first pure water tank is then pressurized by the second booster pump and enters the second-stage RO host for the second reverse osmosis filtration. The filtered pure water enters the second pure water tank. The discharged wastewater, due to its relatively good water quality, is discharged back to the raw water tank for reuse. Then, the first transfer pump transports the pure water in the second pure water tank to the second precision filter for further precision filtration before being sent to the EDI device. The produced ultrapure water enters the ultrapure water tank, and then the second transfer pump transports the ultrapure water to the polishing mixed bed for further removal of residual trace ions in the ultrapure water. Finally, it is sent to the point of use.

[0021] When the return valve on the concentrate return pipe is opened, a portion of the concentrate in the concentrate pipe flows back to the inlet pipe of the first booster pump, mixes with the pre-treated water (water filtered by a multi-stage filtration device and the first precision filter), and is pressurized before entering the first-stage RO unit. Because the concentration of the pre-treated water is increased, the water flow rate and feed rate in the reverse osmosis membrane of the first-stage RO unit can be increased, thereby reducing membrane clogging and extending the membrane's service life.

[0022] Furthermore, by separately setting up a primary RO unit and a secondary RO unit, and setting up booster pumps to pressurize each unit, the water pressure for reverse osmosis is ensured. By mixing a certain amount of concentrated water with pretreated water, the clogging of the inner membrane of the primary RO unit is reduced, and its lifespan is extended.

[0023] A first delivery pump is installed before the EDI unit to increase the pressure of the pure water supplied to the EDI unit, thereby ensuring the water production of the EDI unit.

[0024] like Figure 1 As shown, a raw water transfer pump is installed between the raw water tank and the multi-stage filter to transfer raw water.

[0025] like Figure 1 As shown, specifically, the multi-stage filtration device includes a quartz sand filter and an activated carbon filter to remove large particulate impurities from the raw water.

[0026] like Figure 1 As shown in this example, preferably, the number of reverse osmosis modules in the first-stage RO host is greater than the number of reverse osmosis modules in the second-stage RO host, thereby improving the reverse osmosis effect in the first reverse osmosis stage.

[0027] Specifically, the first-stage RO unit is equipped with parallel modules and series modules. The parallel modules include at least two reverse osmosis modules one and two, and the series modules include at least two reverse osmosis modules three and four. The parallel modules are connected to the series modules. The second-stage RO unit is equipped with at least two reverse osmosis modules connected in series.

[0028] Each reverse osmosis module includes one pure water outlet and two dual-purpose outlets, which can be used as either a concentrate outlet or a raw water inlet.

[0029] In the first-stage RO unit, one of the dual-purpose ports of reverse osmosis modules one and two is connected to the first booster pump as the raw water inlet, and the other dual-purpose port of reverse osmosis modules one and two is used as the concentrate outlet. After being connected in parallel, it is connected to one dual-purpose port of reverse osmosis module three. The other dual-purpose port of reverse osmosis module three is connected to one dual-purpose port of reverse osmosis module four. The other dual-purpose port of reverse osmosis module four is connected to the concentrate tank. The pure water outlets of reverse osmosis modules one, two, three and four are connected in parallel to each other and connected to the first pure water tank.

[0030] In the secondary RO unit, the pure water outlets of all reverse osmosis modules are connected in parallel to the second pure water tank. One dual-purpose port of the first reverse osmosis module is connected to the second booster pump, and one dual-purpose port of the last reverse osmosis module is connected to the raw water tank. The reverse osmosis modules in the middle are connected in series through two dual-purpose ports.

[0031] When the first-stage RO unit is running, the pretreated water first enters the first and second reverse osmosis modules. The resulting pure water directly enters the first pure water tank. The resulting concentrated water enters the third reverse osmosis module for further concentration. The resulting pure water then enters the first pure water tank. The resulting concentrated water then enters the fourth reverse osmosis module for further concentration. The resulting pure water then enters the first pure water tank. The completely concentrated water is then discharged into the concentration tank. Therefore, the first-stage RO unit uses a combination of parallel and series connections for reverse osmosis, which can maximize the production of pure water from the pretreated water and improve the pure water production efficiency.

[0032] like Figure 1 As shown in this example, preferably, a UV sterilization device is installed between the EDI device and the ultrapure water tank to perform the first sterilization and disinfection of the ultrapure water.

[0033] like Figure 1 As shown in this example, preferably, a pure water return pipe is provided on the pipeline between the UV sterilization device and the ultrapure water tank, the pure water return pipe is connected to the second pure water tank, and a valve is provided on the pure water return pipe.

[0034] Specifically, if the ultrapure water quality does not meet the requirements, it is returned to the second ultrapure water tank through the pure water return pipe for re-filtration. In addition, when the ultrapure water tank is full, excess ultrapure water is also vertically transferred to the second tank through the pure water return pipe to keep the EDI device in operation and ensure its electrodialysis and ion exchange effects.

[0035] like Figure 1 As shown in this example, preferably, a TOC sterilization device is provided between the second delivery pump and the polishing mixed bed to remove organic carbon from the ultrapure water.

[0036] like Figure 1 As shown in this example, preferably, the outlet pipe of the polishing mixed bed is equipped with a 0.22μm filter. The outlet pipe of the 0.22μm filter is connected to several water points and is used to intercept all substances larger than 0.22μm through the pipeline, thereby further improving the water quality of ultrapure water and preventing leakage of polishing resin in the polishing mixed bed from contaminating the ultrapure water.

[0037] like Figure 1 As shown in this example, preferably, a residual chlorine reduction device is installed on one side of the raw water tank to remove residual chlorine from the raw water, thereby avoiding damage to the reverse osmosis membrane and reducing the membrane's filtration effect.

[0038] like Figure 1 As shown in this example, preferably, a pH adjustment device is provided on one side of the first pure water tank to adjust the pH value of the pure water in the first pure water tank, so as to improve the desalination rate of the reverse osmosis membrane in the secondary RO host, so as to balance the internal carbonate system of the pure water and keep it at 7.5-7.8 for the highest desalination rate, avoid membrane scaling, and improve membrane life.

[0039] like Figure 1 As shown in the example, preferably, a bypass pipe is provided between the inlet and outlet pipes of the first and second booster pumps. A pressure valve is installed on the bypass pipe. Pressure protection switches are installed on both the inlet and outlet pipes of the first and second booster pumps. The bypass pipe can prevent the instantaneous water pressure from being too high when the pump starts, which could damage the rubber ring of the reverse osmosis membrane inside the RO unit. Damage to the rubber ring will affect the reverse osmosis effect. The pressure protection switches are a low-pressure protection switch and a high-pressure protection switch. The low-pressure protection switch is located on the inlet pipe of the booster pump, which starts the booster pump when the pressure is low. The high-pressure protection switch is located on the outlet pipe of the booster pump, which shuts down the booster pump when the pressure is high.

[0040] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An ultrapure water device, characterized in that: The system includes, in sequence, a raw water tank, a multi-stage filtration device, a first precision filter, a first booster pump, a first-stage RO unit, a first pure water tank, a second booster pump, a second-stage RO unit, a second pure water tank, a first transfer pump, a second precision filter, an EDI device, an ultrapure water tank, a second transfer pump, and a polishing mixed bed. The waste outlet of the first-stage RO unit is connected to the concentrated water tank via a concentrated water pipe, and the waste outlet of the second-stage RO unit is connected to the raw water tank via a wastewater pipe. A concentrated water return pipe is provided between the concentrated water pipe and the first booster pump, and the concentrated water return pipe is connected to the inlet pipe of the first booster pump. A return valve is provided on the concentrated water return pipe.

2. The ultrapure water equipment according to claim 1, characterized in that: The number of reverse osmosis modules in the primary RO unit is greater than the number of reverse osmosis modules in the secondary RO unit.

3. The ultrapure water equipment according to claim 1, characterized in that: A UV sterilization device is installed between the EDI device and the ultrapure water tank.

4. The ultrapure water equipment according to claim 3, characterized in that: A pure water return pipe is installed on the pipeline between the UV sterilization device and the ultrapure water tank. The pure water return pipe is connected to the second pure water tank, and a valve is installed on the pure water return pipe.

5. The ultrapure water equipment according to claim 1, characterized in that: A TOC sterilization device is installed between the second delivery pump and the polishing mixing bed.

6. The ultrapure water equipment according to claim 1, characterized in that: The polishing mixed bed is equipped with a 0.22μm filter on its outlet pipe. The outlet pipe of the 0.22μm filter is connected to several water points and passes through a pipeline.

7. The ultrapure water equipment according to claim 1, characterized in that: A residual chlorine reduction device is installed on one side of the raw water tank.

8. The ultrapure water equipment according to claim 1, characterized in that: A pH adjustment device is installed on one side of the first pure water tank.

9. The ultrapure water equipment according to claim 1, characterized in that: A bypass pipe is provided between the inlet pipe and the outlet pipe of the first booster pump and the second booster pump. A pressure valve is provided on the bypass pipe. A pressure protection switch is provided on the inlet pipe and the outlet pipe of the first booster pump and the second booster pump.

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