External pressure type hollow fiber membrane compression resistance tightness detection device

Abstract

The utility model provides an external pressure type hollow fiber membrane compression resistance tightness detection device, and belongs to the technical field of fiber membrane performance detection equipment. The liquid storage tank is communicated with the reaction tank; a fiber membrane sample to be detected is arranged in the reaction tank; one end of the to-be-detected fibrous membrane sample is connected to the bottom of the reaction tank, the other end of the to-be-detected fibrous membrane sample is communicated with a water producing tank, and the water producing tank is arranged on a weighing device; a plurality of index detectors are arranged in the reaction tank and the water producing tank, and are connected with a PLC (Programmable Logic Controller) control system. According to the utility model, the pressure-resistant tightness of a single membrane or a fiber membrane group can be intelligently tested, and the accuracy in the detection process can be improved through the design of the fixing ring and online water temperature and water quality monitoring; by designing liquid level control of the reaction tank and the water producing tank, automatic water supplementing and changing can be realized, and manpower is saved; the measurement of the water yield of the membrane adopts an electronic scale weighing method instead of a traditional measuring tool, so that the accuracy of data is improved, and frequent testing of personnel is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of fiber membrane performance testing equipment, specifically to an external pressure type hollow fiber membrane compressibility testing device. Background Technology

[0002] Currently, flocculation sedimentation, electrocatalysis, and membrane separation technologies are commonly used to treat water pollution problems. Membrane separation technology is widely used due to its advantages such as small footprint, no secondary pollution, and high efficiency. As the core of membrane separation technology, the performance of membrane materials directly affects the separation effect. Membrane performance mainly includes two aspects: permeation performance and separation performance. The most basic condition for a separation membrane is that the mixture to be separated can selectively permeate. The parameter characterizing the permeation performance of a membrane is the permeation rate, which, for aqueous systems, is also called permeability or water flux. The separation performance of membranes in different separation processes is mainly characterized by parameters such as rejection rate, molecular weight cutoff, and separation factor. Ultrafiltration, microfiltration, and reverse osmosis all use pressure difference as the driving force for transmission. This means that in practical applications, in addition to requirements for the separation and permeation performance of membranes, there are also certain requirements for the mechanical strength and stability of the membrane. The mechanical strength of the membrane can be characterized by parameters such as tensile strength and elongation at break, which are measured using a universal tensile testing machine. The stability of the membrane can be characterized by its pressure resistance. However, existing equipment has limited functionality, with most only testing single fiber membranes; it is complex to operate; it requires frequent testing by personnel, resulting in high labor costs and low accuracy. Utility Model Content

[0003] The purpose of this invention is to provide an external pressure hollow fiber membrane compressibility testing device to solve at least one of the technical problems existing in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides an external pressure type hollow fiber membrane compressibility testing device, comprising:

[0006] A liquid storage tank; the liquid storage tank is connected to a reaction tank; a fiber membrane sample to be tested is placed in the reaction tank; one end of the fiber membrane sample to be tested is connected to the bottom of the reaction tank, and the other end of the fiber membrane sample to be tested is connected to a product water tank, which is located on a weighing device;

[0007] Both the reaction tank and the product water tank are equipped with multiple indicator detectors, and these multiple indicator detectors are connected to the PLC control system.

[0008] Furthermore, a first drive pump is connected between the storage tank and the reaction tank.

[0009] Furthermore, the other end of the fiber membrane sample to be tested is connected to the water production tank via a second drive pump.

[0010] Furthermore, the water production tank is connected to a third drive pump.

[0011] Furthermore, the weighing device is connected to a PC.

[0012] Furthermore, one end of the fiber membrane sample to be tested is connected to the bottom of the reaction tank via a fixing ring.

[0013] Furthermore, the other end of the fiber membrane sample to be tested is connected to a quick-connect plug, which is connected to a second drive pump via a quick-connect plug pipe.

[0014] Furthermore, a pressure gauge is installed on the connecting pipe between the fiber membrane sample to be tested and the second drive pump.

[0015] The advantages of this invention are: it can intelligently test the pressure resistance of a single membrane or fiber membrane module, and the design of a fixed ring and online water temperature and water quality monitoring can improve the accuracy of the testing process; by designing liquid level control for the reaction tank and product water tank, automatic water replenishment and replacement can be achieved, saving manpower; the determination of membrane water production is carried out by electronic scale weighing instead of traditional measuring tools (measuring cylinder, measuring cup, etc.), which increases the accuracy of the data and reduces the need for frequent testing by personnel.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural diagram of the external pressure type hollow fiber membrane compressibility testing device described in an embodiment of this utility model.

[0019] Wherein: 1-Storage tank; 2a-First drive pump; 3-Reaction tank; 4-Fiber membrane sample to be tested; 5-Connector; 6-Quick connector; 7-Temperature sensor; 8a-First liquid level sensor; 9-TDS sensor; 10-PLC control system; 11-Pressure gauge; 12-Second drive pump; 13-Production water tank; 14-Weighing device; 8b-Second liquid level sensor; 15-PC terminal; 2b-Third drive pump. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0022] It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as described here.

[0023] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the word “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, and / or groups thereof.

[0024] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. Furthermore, the described specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0025] In the description of this specification, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In the description of this specification, the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this technology 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. Therefore, they should not be construed as limitations on this technology.

[0027] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of these terms in this art according to the specific circumstances.

[0028] To facilitate understanding of this utility model, the present utility model will be further explained and described below with reference to the accompanying drawings and specific embodiments. The specific embodiments do not constitute a limitation on the embodiments of this utility model.

[0029] Those skilled in the art should understand that the accompanying drawings are merely schematic diagrams of embodiments, and the components in the drawings are not necessarily essential for implementing this utility model.

[0030] Membrane flux does not increase linearly with increasing filtration pressure. The flux varies significantly depending on the membrane fiber porosity and stiffness. To characterize the performance of fiber membranes in practical applications, it is necessary to test their compressibility. Therefore, this invention provides an external pressure hollow fiber membrane compressibility testing device. This device is simple to operate, enables continuous long-term testing of high-flux fiber membrane modules, provides high accuracy, and has relatively low overall labor costs.

[0031] like Figure 1 As shown, in one specific embodiment, the external pressure hollow fiber membrane pressure resistance testing device includes: a storage tank 1; the storage tank 1 is connected to a reaction tank 3; a fiber membrane sample 4 to be tested is disposed in the reaction tank 3; one end of the fiber membrane sample 4 to be tested is connected to the bottom of the reaction tank 3, and the other end of the fiber membrane sample 4 to be tested is connected to a product water tank 13, the product water tank 13 being mounted on a weighing device 14; both the reaction tank 3 and the product water tank 13 are equipped with multiple indicator detectors, and the multiple indicator detectors are connected to a PLC control system 10. The multiple indicator detectors include, for example, a temperature sensor 7, a first liquid level sensor 8a, and a TDS sensor disposed in the reaction tank, and a second liquid level sensor 8b disposed in the product water tank. Alternatively, the indicator detectors can also be other water quality indicators affecting water flux testing, such as a separate pH sensor to detect the pH value in the reaction tank.

[0032] The storage tank 1 and the reaction tank 3 are connected by a first driving pump 2a, which can be a water pump. The other end of the fiber membrane sample 4 to be tested is connected to a product water tank 13 via a second driving pump 12. The second driving pump 12 provides the driving force for water flow through the membrane; it can be a peristaltic pump or other pumps, such as a metering pump. The product water tank is connected to a third driving pump 2b, which can also be a water pump. The weighing device 14 is connected to a PC; it can be an electronic scale or other methods, such as an analytical balance.

[0033] Furthermore, one end of the fiber membrane sample 4 to be tested is connected to the bottom of the reaction tank 3 via a connector 5. The connector 5 can be a retaining ring or other forms of membrane sample fixation methods, such as a retaining ring. The other end of the fiber membrane sample 4 to be tested is connected to a quick-connect plug 6, which is connected to the second drive pump 12 via a pipe. A pressure gauge 11 is installed on the connecting pipe between the fiber membrane sample 4 to be tested and the second drive pump 12.

[0034] The fiber membrane sample 4 to be tested is placed in the reaction tank 3, with one end inserted into the quick-connect connector 6 and the other end placed in the fixing ring 5 to ensure that the membrane sample is in the same vertical position. The liquid in the reaction tank 3 needs to completely submerge the membrane sample. The temperature of the liquid and the total amount of dissolved solids are monitored in real time by the temperature sensor 7 and the TDS sensor 9, respectively. The peristaltic pump (second drive pump 12) is turned on and the pressure is adjusted to a certain value. Under the pressure on both sides of the membrane, the permeate flows into the permeate tank 13 and is weighed by the electronic scale (weighing device 14). The data is fed back to the PC terminal 15. When the liquid level in the reaction tank is lower than the set water level, the water pump (first drive pump 2a) automatically replenishes the liquid in the constant temperature storage tank 1 into the reaction tank 3 to set the liquid level. The liquid level in the permeate tank 13 is controlled by the second liquid level sensor 8b. When the liquid level is higher than the set water level, the third drive pump 2b automatically discharges the liquid in the permeate tank 13. The electrical control cabinet is located outside the reaction tank 3. The electrical control cabinet is equipped with a PLC control system 10. The PLC control system includes a PLC controller. The PLC controller is connected to the first liquid level sensor 8a, temperature sensor 7, TDS sensor 9, first drive pump 2a, and second drive pump 2b by wires.

[0035] The constant-temperature storage tank is a glass cylinder with a lid for easy water level observation. A stirring rod, heating rod, and temperature sensor are inserted into the tank through an insertion hole on the top of the lid. One end of the temperature sensor is connected to a digital display control panel for precise temperature control. One end of the inlet pipe of the first drive pump 2a is inserted into the constant-temperature storage tank through an insertion hole on the top of the lid, and the other end is inserted into an insertion hole on the top of the reaction tank. The reaction tank is a covered acrylic cylindrical reaction tank with an insertion hole on the top of the lid. One end of the temperature sensor 7, the first liquid level sensor 8a, and the TDS sensor 9 are inserted into the reaction tank through the insertion hole, and the other end is connected to the PLC controller via a wire. One end of the membrane sample in the reaction tank is connected to a quick-connect fitting for simultaneous testing of fiber membranes or membrane modules. The other end of the quick-connect fitting is connected to a pipe for connecting a pressure gauge through an insertion hole on the top of the lid. The other end of the membrane sample is connected to a retaining ring, the size of which is adjustable. The retaining ring is connected to the bottom of the reaction tank via a support rod. The product water tank is a transparent plastic bucket with a lid. There is a socket on the top of the lid. One end of the second liquid level sensor 8b is inserted into the product water tank through the socket, and the other end is connected to the PLC controller via a wire. One end of the peristaltic pump is connected to the pressure gauge line via a hose, and the other end is inserted into the socket on the top of the product water tank lid. One end of the second drive pump 2b is inserted into the product water tank through the socket on the top of the lid, and the other end discharges water directly through a pipeline. The product water volume is measured by an electronic scale, which is connected to a PC via a data transmission line. The PC automatically records the data.

[0036] In one specific embodiment, when using the aforementioned external pressure hollow fiber membrane pressure resistance testing device, three membrane samples of the same specifications are prepared from a single membrane. After soaking in deionized water for a certain period of time, one membrane sample is inserted into a quick-connect fitting at one end and a fixing ring at the other end, completely immersed in the reaction tank for testing. The testing device is operated using dead-end filtration, with a TDS of 20 mg / L in the solution, a water temperature of 24°C, a suction pressure of 20 kPa, and constant pressure operation for 2 hours. The data acquisition interval is 20 min. The water flux in the first and second hours under continuous membrane operation is recorded. The result is calculated according to lg(J1 / J t The compressibility coefficient of the membrane is calculated using the formula ) = -mlgt. The closer the absolute value of the compressibility coefficient is to 0, the better the compressibility resistance. The other two membrane samples were tested in parallel using the same procedure.

[0037] In another specific embodiment, when using the aforementioned external pressure hollow fiber membrane pressure-tightness testing device, three membrane modules of the same specification, each consisting of 10 membrane fibers, are prepared and soaked in deionized water for 4 hours. One end of the fiber membrane module is inserted into a quick-connect fitting, and the other end is inserted into a fixing ring, ensuring that the entire fiber membrane module is submerged in the solution. The TDS in the solution is 19 mg / L, the suction pressure is 20 kPa, the water flux of the fiber membrane module is large, and the continuous operation time is long due to the differences in membrane fibers. The liquid level in the reaction tank and the product water tank changes significantly, requiring a high frequency of automatic water replenishment and replacement. It is necessary to monitor the water temperature and TDS changes in the reaction tank online at all times. The membrane is operated under constant pressure for 6 hours, with a data acquisition interval of 30 minutes. The water flux at the 1st and 6th hours under continuous membrane operation is recorded. According to lg(J 1 / J t The compressibility coefficient of the membrane is calculated using the formula ) = -mlgt. The closer the absolute value of the compressibility coefficient is to 0, the better the compressibility resistance. The other two membrane samples were tested in parallel using the same procedure.

[0038] In summary, the intelligent compressive strength testing device described in this embodiment of the invention can conveniently test single fiber membranes or fiber membrane assemblies. The fixing ring at the other end effectively ensures the sample is in a vertical position, reducing sample testing errors. Intelligent control throughout the compressive strength testing process mainly refers to monitoring water temperature and water quality changes that affect test accuracy. Automatic water replenishment and drainage are achieved through level control in the reaction tank and product water tank, saving manpower. The water volume in the product water tank is weighed online using an electronic scale, and the data is directly transmitted to a PC, improving the accuracy of test data and significantly reducing the workload of personnel.

[0039] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that, based on the technical solutions disclosed in the present utility model, all modifications or variations that can be made by those skilled in the art without creative effort should be included within the scope of protection of the present utility model.

Claims

1. An external pressure type hollow fiber membrane compressibility testing device, characterized in that, include: Storage tank; The storage tank is connected to the reaction tank; The reaction tank contains a fiber membrane sample to be tested. One end of the fiber membrane sample to be tested is connected to the bottom of the reaction tank, and the other end of the fiber membrane sample to be tested is connected to the product water tank, which is located on the weighing device. Both the reaction tank and the product water tank are equipped with multiple indicator detectors, and these multiple indicator detectors are connected to the PLC control system.

2. The external pressure type hollow fiber membrane compressibility testing device according to claim 1, characterized in that, A first drive pump is connected between the storage tank and the reaction tank.

3. The external pressure type hollow fiber membrane compressibility testing device according to claim 1, characterized in that, The other end of the fiber membrane sample to be tested is connected to the water production tank via a second drive pump.

4. The external pressure type hollow fiber membrane compressibility testing device according to claim 1, characterized in that, The water production tank is connected to a third drive pump.

5. The external pressure type hollow fiber membrane compressibility testing device according to claim 1, characterized in that, The weighing device is connected to a PC.

6. The external pressure type hollow fiber membrane compressibility testing device according to claim 1, characterized in that, One end of the fiber membrane sample to be tested is connected to the bottom of the reaction tank via a connector.

7. The external pressure type hollow fiber membrane compressibility testing device according to claim 3, characterized in that, The other end of the fiber membrane sample to be tested is connected to a quick-connect plug, which is connected to a second drive pump through a pipe.

8. The external pressure type hollow fiber membrane compressibility testing device according to claim 7, characterized in that, A pressure gauge is installed on the connecting pipe between the fiber membrane sample to be tested and the second drive pump.

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