Stock solution filtering system

Abstract

The utility model provides a stock solution filtering system, and belongs to the technical field of stock solution treatment. Comprising a stock solution tank, a rough filtration device, an ultrafiltration device, a clear liquid tank, a backwashing tank, a first pipeline and a second pipeline, the stock solution tank, the rough filtration device, the ultrafiltration device and the clear solution tank are communicated through a first pipeline; the ultrafiltration device is communicated with the backwashing tank through a second pipeline; a first pipeline among the ultrafiltration device, the stock solution tank and the clear solution tank is reasonably arranged around the ultrafiltration device, so that the stability and reliability of the filtering process are ensured; furthermore, on the basis of the first pipeline, a second pipeline among the ultrafiltration device, the stock solution tank and the backwashing tank is reasonably arranged around the ultrafiltration device, so that the ultrafiltration device and the pipelines are efficiently cleaned, the service life of the ultrafiltration device is effectively prolonged, and the maintenance cost of the ultrafiltration device is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of stock solution treatment, and particularly to a stock solution filtration system. Background Art

[0002] A nanofiltration membrane is a common filtration device in the field of stock solution treatment. The design of the nanofiltration membrane is simple and the packing density is large. The internal structure of a common spiral wound nanofiltration module is formed by winding multiple "membrane bags" outside a porous central tube. Three sides of the membrane bag are sealed, and the other side is sealed to the porous central tube. A permeate flow channel is formed inside the membrane bag with a porous support material. A feed liquid flow channel is formed between the membrane bags with a mesh material. The feed liquid flows parallel to the central collection tube. The permeate that enters the membrane bag rotates and flows towards the central collection tube and flows out from the central collection tube.

[0003] The nanofiltration module has the following special functions. Filtration function: There are numerous micropores in the semi-permeable membrane of nanofiltration for water molecules to pass through, and the membrane can also remove dissolved salts through the filtration function. Self-cleaning function: Generally, when a water filter removes pollutants, it also retains these pollutants in the water filter. Thereafter, the water to be filtered has to pass through these pollutants, thus causing secondary pollution to the water. At the same time, bacteria also multiply in the water filter, causing microbial re-pollution of the water. However, the semi-permeable membrane of nanofiltration retains all pollutants in the concentrated water to be discharged during the separation process to achieve the self-cleaning function. Therefore, the obtained permeate is more reliable and the service life of the equipment is longer.

[0004] However, the cost of the nanofiltration membrane as a consumable in the nanofiltration module is high, and the pressure requirements before and after the nanofiltration membrane are particularly high. Therefore, it is difficult to use the nanofiltration module to construct an efficient and reliable stock solution filtration system in the prior art. Utility Model Content

[0005] The purpose of the present application is to solve the problem that there is no efficient and reliable stock solution filtration system using a nanofiltration module in the prior art. Therefore, the present application provides a stock solution filtration system, which reasonably arranges the first pipeline among the ultrafiltration device, the stock solution tank and the clear liquid tank around the ultrafiltration device to ensure the stability and reliability of the filtration process; further, on the basis of the first pipeline, the second pipeline among the ultrafiltration device, the stock solution tank and the backwashing tank is reasonably arranged around the ultrafiltration device, so as to efficiently clean the ultrafiltration device and the pipeline, effectively improve the service life of the ultrafiltration device, and reduce the maintenance cost of the ultrafiltration device.

[0006] An embodiment of the present application provides a stock solution filtration system, including:

[0007] A stock solution tank, including a reflux port, a liquid delivery port and a liquid discharge port;

[0008] A coarse filtration device, including a coarse filtration inlet and a coarse filtration outlet;

[0009] Ultrafiltration device, including a feed inlet before the membrane, a discharge outlet under pressure, and an ultrafiltration outlet;

[0010] Clean liquid tank, connected to the ultrafiltration outlet, for storing the clean liquid filtered by the ultrafiltration device;

[0011] Backwash tank, including a first return liquid port, a second return liquid port, and a backwash outlet;

[0012] First pipeline, the first pipeline connects the liquid delivery port of the stock solution tank with the rough filtration inlet, the rough filtration outlet with the feed inlet before the membrane, the ultrafiltration outlet with the clean liquid tank, and the discharge outlet under pressure with the return port of the stock solution tank;

[0013] And a first pressure pump is provided between the liquid delivery port of the stock solution tank and the rough filtration inlet, and a second pressure pump is provided between the rough filtration outlet and the feed inlet before the membrane;

[0014] Second pipeline, the second pipeline connects the backwash outlet with the feed inlet before the membrane, the ultrafiltration outlet with the first return liquid port, and the discharge outlet under pressure with the second return liquid port.

[0015] With the above technical solution, rough filtration and ultrafiltration of the stock solution are realized through the first pipeline, and the concentrated water discharged by ultrafiltration can flow back to the stock solution tank, so as to realize repeated filtration and treatment of the stock solution; at the same time, in order to better maintain the ultrafiltration device, a second pipeline is provided, which can deeply clean the ultrafiltration device, and the cleaning liquid after cleaning can flow back to the stock solution tank to dilute the stock solution, thus saving and making full use of cleaning resources.

[0016] In some embodiments, a first three-way valve is provided in the pipeline between the discharge outlet under pressure, the return port of the stock solution tank, and the second return liquid port; so that the discharge outlet under pressure is connected to the return port of the stock solution tank through the first three-way valve, or the discharge outlet under pressure is connected to the second return liquid port through the first three-way valve;

[0017] A heat exchanger is provided in the pipeline between the first three-way valve and the discharge outlet under pressure;

[0018] A flushing valve and a flow valve are arranged in parallel between the liquid inlet of the heat exchanger and the discharge outlet under pressure.

[0019] With the above technical solution, the layout of the first pipeline and the second pipeline can be simplified, making the integration degree of the pipeline layout higher. And a heat exchanger is provided between the first three-way valve and the discharge outlet under pressure to avoid the liquid temperature flowing back to the stock solution tank being too high, causing potential safety hazards.

[0020] In some embodiments, a second manual valve, a pressure sensor, and a transmitter are provided in the pipeline between the second pressure pump and the feed inlet before the membrane;

[0021] A pressure sensor and a transmitter are provided between the parallelly connected flushing valve and flow valve and the discharge pressure outlet.

[0022] A flow sensor is provided between the parallelly connected flushing valve and flow valve and the heat exchanger.

[0023] A flow sensor is provided on the pipeline connected to the ultrafiltration outlet.

[0024] With the above technical solution, the flushing valve can be opened during the backwashing process to ensure the rapid flow of the liquid. The flow valve is opened during filtration and controls the liquid flow rate, thereby controlling the pressure difference between the solutions before and after the ultrafiltration device, which can ensure that the ultrafiltration device works under the most suitable pressure difference and is beneficial to improving the service life of the ultrafiltration device.

[0025] In some embodiments, a three-way valve II is provided on the pipeline between the ultrafiltration outlet, the clear liquid tank and the first return liquid port; so that the ultrafiltration outlet is communicated with the clear liquid tank through the three-way valve II, or the ultrafiltration outlet is communicated with the first return liquid port through the three-way valve II.

[0026] With the above technical solution, the layout of the first pipeline and the second pipeline can be simplified, making the integration degree of the pipeline layout higher.

[0027] In some embodiments, a three-way valve III is provided on the pipeline between the rough filtration outlet, the liquid inlet before the membrane and the backwashing outlet; so that the rough filtration outlet is communicated with the liquid inlet before the membrane through the three-way valve III, or the ultrafiltration outlet is communicated with the backwashing outlet through the three-way valve III;

[0028] And the three-way valve III is arranged between the rough filtration outlet and the second pressure pump.

[0029] With the above technical solution, the layout of the first pipeline and the second pipeline can be simplified, making the integration degree of the pipeline layout higher.

[0030] In some embodiments, first manual regulating valves are provided on the pipelines at both ends of the first pressure pump;

[0031] A pressure sensor and a temperature sensor are provided on the pipeline between the three-way valve III and the second pressure pump.

[0032] In some embodiments, pressure sensors are provided in the rough filtration device, the clear liquid tank and the backwashing tank.

[0033] Other features and corresponding beneficial effects of this application are described in the later part of the specification, and it should be understood that at least some of the beneficial effects are obvious from the description in the specification of this application. Brief Description of the Drawings

[0034] Figure 1 The figure is a schematic structural diagram of a stock solution filtration system provided by an embodiment of the present application.

[0035] Description of the reference numerals in the drawings:

[0036] 1. Stock solution tank; 2. Coarse filtration device; 3. Ultrafiltration device; 4. Clear liquid tank; 5. Backwash tank; 6. Heat exchanger; 7. Flushing valve; 8. Flow valve;

[0037] 11. First pressure pump; 12. Second pressure pump;

[0038] 21. First three-way valve; 22. Second three-way valve; 23. Third three-way valve. Detailed Embodiments

[0039] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention will be introduced in conjunction with preferred embodiments, this does not mean that the features of this invention are limited to this implementation manner. On the contrary, the purpose of introducing the invention in conjunction with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, many specific details will be included in the following description. The present invention can also be implemented without using these details. In addition, in order to avoid confusing or obscuring the key points of the present invention, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0040] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Therefore, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0043] To make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the drawings.

[0044] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a stock solution filtration system provided by an embodiment of the present application.

[0045] As Figure 1 shown, an embodiment of the present application provides a stock solution filtration system, including:

[0046] A stock solution tank 1, including a reflux port, a liquid supply port and a liquid discharge port;

[0047] A coarse filtration device 2, including a coarse filtration inlet and a coarse filtration outlet;

[0048] An ultrafiltration device 3, including a pre-membrane inlet, a pressure relief outlet and an ultrafiltration outlet;

[0049] A clear liquid tank 4, communicated with the ultrafiltration outlet, for storing the clear liquid filtered by the ultrafiltration device 3;

[0050] A backwashing tank 5, including a first return port, a second return port and a backwashing outlet;

[0051] A first pipeline, the first pipeline communicates the liquid supply port of the stock solution tank 1 with the coarse filtration inlet, the coarse filtration outlet with the pre-membrane inlet, the ultrafiltration outlet with the clear liquid tank 4, and the pressure relief outlet with the reflux port of the stock solution tank 1;

[0052] And a first pressure pump 11 is arranged between the liquid supply port of the stock solution tank 1 and the coarse filtration inlet, and a second pressure pump 12 is arranged between the coarse filtration outlet and the pre-membrane inlet;

[0053] A second pipeline, the second pipeline communicates the backwashing outlet with the pre-membrane inlet, the ultrafiltration outlet with the first return port, and the pressure relief outlet with the second return port.

[0054] With the above technical solution, the rough filtration and ultrafiltration of the stock solution are achieved through the first pipeline, and the concentrated water discharged by the ultrafiltration can flow back to the stock solution tank 1, so as to achieve the repeated filtration and treatment of the stock solution. At the same time, in order to better maintain the ultrafiltration device 3, a second pipeline is set up, which can deeply clean the ultrafiltration device 3, and the cleaning liquid after cleaning can flow back to the stock solution tank 1 to dilute the stock solution, thus saving and making full use of the cleaning resources.

[0055] In one embodiment, the ultrafiltration device 3 is set as a nanofiltration module.

[0056] In one embodiment, a three-way valve 21 is arranged on the pipeline between the pressure discharge outlet, the return port of the stock solution tank 1 and the second return port; so that the pressure discharge outlet is communicated with the return port of the stock solution tank 1 through the three-way valve 21, or the pressure discharge outlet is communicated with the second return port through the three-way valve 21;

[0057] A heat exchanger 6 is arranged on the pipeline between the three-way valve 21 and the pressure discharge outlet;

[0058] A flush valve 7 and a flow valve 8 are arranged in parallel between the liquid inlet of the heat exchanger 6 and the pressure discharge outlet.

[0059] With the above technical solution, the layout of the first pipeline and the second pipeline can be simplified, making the integration degree of the pipeline layout higher. And a heat exchanger 6 is arranged between the three-way valve 21 and the pressure discharge outlet to avoid the liquid flowing back to the stock solution tank 1 having too high a temperature and causing potential safety hazards.

[0060] In one embodiment, a second manual valve, a pressure sensor and a transmitter are arranged on the pipeline between the second pressure pump 12 and the membrane inlet;

[0061] A pressure sensor and a transmitter are arranged between the parallel flush valve 7 and flow valve 8 and the pressure discharge outlet;

[0062] A flow sensor is arranged between the parallel flush valve 7 and flow valve 8 and the heat exchanger 6;

[0063] A flow sensor is arranged on the pipeline connected to the ultrafiltration outlet.

[0064] With the above technical solution, the flush valve 7 can be opened during the backwashing process to ensure the rapid flow of the liquid. And the flow valve 8 is opened during filtration and controls the liquid flow, so as to control the pressure difference between the solutions before and after the ultrafiltration device 3, which can ensure that the ultrafiltration device 3 works at the most suitable pressure difference and is beneficial to improving the service life of the ultrafiltration device 3.

[0065] In one embodiment, a three-way valve two 22 is provided in the pipeline between the ultrafiltration outlet, the clear liquid tank 4 and the first liquid return port; so that the ultrafiltration outlet is communicated with the clear liquid tank 4 through the three-way valve two 22, or the ultrafiltration outlet is communicated with the first liquid return port through the three-way valve two 22.

[0066] By adopting the above technical solution, the layout of the first pipeline and the second pipeline can be simplified, making the integration degree of the pipeline layout higher.

[0067] In one embodiment, a three-way valve three 23 is provided in the pipeline between the rough filtration outlet, the liquid inlet before the membrane and the backwashing outlet; so that the rough filtration outlet is communicated with the liquid inlet before the membrane through the three-way valve three 23, or the ultrafiltration outlet is communicated with the backwashing outlet through the three-way valve three 23;

[0068] And the three-way valve three 23 is arranged between the rough filtration outlet and the second pressure pump 12.

[0069] By adopting the above technical solution, the layout of the first pipeline and the second pipeline can be simplified, making the integration degree of the pipeline layout higher.

[0070] In one embodiment, the three-way valve one 21, the three-way valve two 22 and the three-way valve three 23 all adopt pneumatic valve bodies to facilitate the control of the valve bodies.

[0071] In one embodiment, first manual regulating valves are arranged on the pipelines at both ends of the first pressure pump 11;

[0072] A pressure sensor and a temperature sensor are arranged on the pipeline between the three-way valve three 23 and the second pressure pump 12.

[0073] In one embodiment, pressure sensors are arranged in the rough filtration device 2, the clear liquid tank 4 and the backwashing tank 5.

[0074] In a use scenario, when cleaning the stock solution, first set each valve body to ensure that only the first pipeline is connected;

[0075] At this time, open the flushing valve 7, and only start the first pressure pump 11. After 30 seconds, close the flushing valve 7, control the flow rate of the discharge outlet through the flow valve 8, and at the same time start the second pressure pump 12 to make the ultrafiltration device 3 carry out the filtration work.

[0076] When cleaning the system; first set each valve body to ensure that only the second pipeline is connected, open the flushing valve 7, and only start the second pressure pump 12 to make the backwashing liquid circulate in the pipeline several times to complete the cleaning work of the system.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A raw liquid filtration system, characterized in that: include: A raw liquid tank, including a reflux port, a liquid delivery port and a liquid discharge port; A coarse filtration device, comprising a coarse filtration liquid inlet and a coarse filtration liquid outlet; The ultrafiltration device comprises a membrane front liquid inlet, a pressure discharge liquid outlet and an ultrafiltration liquid outlet; A clear liquid tank, connected to the ultrafiltration outlet, for storing the clear liquid filtered by the ultrafiltration device; A backwash tank, comprising a first liquid return port, a second liquid return port and a backwash liquid outlet; A first pipeline, wherein the first pipeline connects the liquid delivery port of the raw liquid tank with the coarse filtration liquid inlet, the coarse filtration liquid outlet with the membrane front liquid inlet, the ultrafiltration liquid outlet with the clear liquid tank, and the pressure relief liquid outlet with the reflux port of the raw liquid tank; A first pressure pump is provided between the liquid delivery port of the raw liquid tank and the coarse filter liquid inlet, and a second pressure pump is provided between the coarse filter liquid outlet and the membrane front liquid inlet; The second pipeline connects the backwash liquid outlet with the membrane front liquid outlet, the ultrafiltration liquid outlet with the first liquid return outlet, and the pressure discharge liquid outlet with the second liquid return outlet.

2. The raw liquid filtration system according to claim 1, characterized in that: A three-way valve 1 is provided in the pipeline between the pressure discharge outlet, the reflux port of the raw liquid tank and the second liquid return port; so that the pressure discharge outlet is connected with the reflux port of the raw liquid tank through the three-way valve 1, or the pressure discharge outlet is connected with the second liquid return port through the three-way valve 1; The pipeline between the three-way valve 1 and the pressure discharge outlet is provided with a heat exchanger; A flushing valve and a flow valve are arranged in parallel between the liquid inlet of the heat exchanger and the pressure discharge liquid outlet.

3. The raw liquid filtration system according to claim 2, characterized in that: The pipeline between the second pressure pump and the membrane front liquid inlet is provided with a second manual valve, a pressure sensor and a transmitter; A pressure sensor and a transmitter are arranged between the flushing valve and the flow valve connected in parallel and the pressure discharge outlet; A flow sensor is provided between the flushing valve and the flow valve connected in parallel and the heat exchanger; The pipeline connected to the ultrafiltration outlet is provided with a flow sensor.

4. The raw liquid filtration system according to claim 1, characterized in that: A pipeline between the ultrafiltration outlet, the clean liquid tank and the first liquid return port is provided with a three-way valve 2, so that the ultrafiltration outlet is connected to the clean liquid tank through the three-way valve 2, or the ultrafiltration outlet is connected to the first liquid return port through the three-way valve 2.

5. The raw liquid filtration system according to claim 1, characterized in that: A three-way valve is provided in the pipeline between the rough filter outlet, the membrane front liquid inlet and the backwash outlet; so that the rough filter outlet is connected with the membrane front liquid inlet through the three-way valve, or the ultrafiltration outlet is connected with the backwash outlet through the three-way valve; And the three-way valve is arranged between the coarse filter outlet and the second pressure pump.

6. The raw liquid filtration system according to claim 5, characterized in that: The pipelines at both ends of the first pressure pump are provided with first manual regulating valves; The pipeline between the three-way valve 3 and the second pressure pump is provided with a pressure sensor and a temperature sensor.

7. The raw liquid filtration system according to claim 1, characterized in that: The coarse filtering device, the clean liquid tank and the backwash tank are all provided with pressure sensors.

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