Pulse pressure control cross flow filtering device for laboratory

Abstract

The utility model relates to the technical field of experimental equipment, in particular to a pulse pressure control cross-flow filtering device for a laboratory, which comprises a feed liquid feeding device and a membrane component, the feed liquid feeding device provides feed liquid for the membrane component through a pump, the membrane component provides circulating liquid for the feed liquid feeding device through a valve and a pipeline, and the membrane component is connected with the feed liquid feeding device. A flow dividing device is arranged on a pipeline between the pump and the membrane assembly, an electromagnetic valve is connected between the flow dividing device and the feeding liquid device, a pipeline pressure pulse flow path is further formed at an inlet of the membrane assembly, and the electromagnetic valve is connected with a control device. And the control device controls the electromagnetic valve to be opened or closed so as to realize pulse filtration simulation on the membrane in the membrane assembly. The cross-flow filtering device disclosed by the utility model is simple to operate, can realize rapid pulse pressure change, effectively improves the anti-pollution performance simulation of an ultrafiltration membrane on oil and water, and provides a good theoretical basis for an actual cross-flow filtering device.

Description

Technical Field

[0001] This utility model relates to the field of experimental equipment technology, and in particular to a pulse pressure controlled cross-flow filtration device for laboratory use. Background Technology

[0002] The statements in this section are merely to provide background information related to the disclosure of this utility model and do not necessarily constitute prior art.

[0003] Membrane separation technology originated in the 1960s. Due to its numerous advantages, including high efficiency, high selectivity, small footprint, low cost, and low energy consumption, it has played and continues to play a significant role in water treatment. However, membrane fouling is an unavoidable problem in membrane separation processes such as ultrafiltration. Adsorption resistance, concentration polarization resistance, pore blockage resistance, and filter cake resistance all contribute to the membrane fouling process. Pulsed pressure changes can effectively address membrane fouling caused by concentration polarization. However, previous methods primarily relied on controlling pump flow and ball valve opening to achieve pressure changes, which resulted in low pulse efficiency and irreversible damage to equipment over time. Therefore, it is essential to provide an effective, simple, and rapid method for controlling pressure pulses during the filtration process. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this utility model provides a laboratory pulse pressure controlled cross-flow filtration device that connects an electromagnetic valve between the diversion device and the feed liquid device, thereby forming a pipeline pressure pulse flow path at the inlet of the membrane module, and realizing the formation of intermittent pressure pulses on the ultrafiltration membrane in the membrane module. Based on the mechanism of alleviating concentration polarization and potential "dielectric surge" anti-fouling, it effectively improves the anti-fouling performance of the ultrafiltration membrane against oil and water.

[0005] The technical solution adopted in this utility model is: a laboratory pulse pressure controlled cross-flow filtration device, including a feed liquid device and a membrane module. The feed liquid device provides feed liquid to the membrane module through a pump. The membrane module provides circulating liquid to the feed liquid device through valves and pipelines. A flow divider is set on the pipeline between the pump and the membrane module. A solenoid valve is connected between the flow divider and the feed liquid device, thereby forming a pipeline pressure pulse flow path at the inlet of the membrane module. The solenoid valve is connected to a control device, and the control device controls the solenoid valve to open or close to realize pulse filtration simulation to the membrane in the membrane module.

[0006] In this technical solution, the valve and the feeding device are equipped with pressure display devices, and the valve is a ball valve or a pneumatic back pressure valve.

[0007] In this technical solution, the pressure display device is a pressure gauge.

[0008] In this technical solution, the solenoid valve is a normally closed solenoid valve.

[0009] In this technical solution, the control device is a PLC control device, and the pump is an electromagnetic pump, gear pump, peristaltic pump, or diaphragm pump.

[0010] In this technical solution, the diversion device is a three-way valve.

[0011] In this technical solution, the membrane module is an ultrafiltration membrane module.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. A pipeline pressure pulse flow path is formed at the inlet of the membrane module to generate intermittent pressure pulses to the ultrafiltration membrane inside the membrane module. This allows the membrane inside the membrane module to generate backflow during filtration, thereby reducing the contamination of the membrane module by the contaminated liquid in the feed liquid device and improving the filtration efficiency of the membrane module.

[0014] 2. Use a diversion device to intermittently buffer the contaminated liquid in the feed liquid device before the membrane module inlet, thereby reducing the contamination density at the membrane module inlet and improving filtration capacity and service life.

[0015] In summary, the laboratory pulse pressure controlled cross-flow filtration device of this invention is simple to operate, can achieve rapid pulse pressure changes, and is convenient and quick to operate. Moreover, based on the mechanism of mitigating concentration polarization and the potential "dielectric surge" anti-fouling effect, it effectively improves the anti-fouling performance of ultrafiltration membranes against oil and water, providing a good theoretical basis for practical cross-flow filtration devices. Attached Figure Description

[0016] Figure 1 A structural diagram of an embodiment of a pulse pressure controlled crossflow filtration device for laboratory use;

[0017] Figure 2 The fouling curve of the constant pressure membrane for filtering emulsion;

[0018] Figure 3 The fouling curve of the pulse pressure membrane for filtering emulsion;

[0019] Among them: 1-feed liquid device, 2-membrane module, 3-pump, 4-valve, 5-diverter, 6-solenoid valve, 7-control device, 8-pressure display device. 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] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," and "right," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the combination 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 utility model. Furthermore, in the description of the embodiments of this utility model, the positional relationships of devices such as "upper," "lower," "front," "rear," "left," and "right" in all figures are based on... Figure 1 As the standard.

[0022] like Figure 1 As shown, a laboratory pulse pressure controlled cross-flow filtration device includes a feed liquid device 1 and a membrane module 2. The feed liquid device 1 supplies feed liquid to the membrane module 2 via a pump 3. The membrane module 2 supplies circulating liquid to the feed liquid device 1 via a valve 4 and pipeline. A flow divider 5 is installed on the pipeline between the pump 3 and the membrane module 2. A solenoid valve 6 is connected between the flow divider 5 and the feed liquid device 1, thereby forming a pipeline pressure pulse flow path at the inlet of the membrane module 2. The solenoid valve 6 is connected to a control device 7, which controls the opening or closing of the solenoid valve 6 to simulate pulse filtration into the membrane within the membrane module 2. In specific experiments, the feed liquid in the feed liquid device 1 can be a suspension dispersion, a dissolved organic solution, an oil-water emulsion, etc. In this laboratory pulse pressure controlled cross-flow filtration device, the periodic opening / closing of the solenoid valve 6 during operation causes the flow rate and pressure of the feed liquid entering the membrane module 2 to change periodically due to the influence of the flow divider 5, thus achieving the effect of pulse feeding to the membrane surface.

[0023] In the laboratory pulse pressure controlled cross-flow filtration device, a typical 100 ppm oil-water emulsion was selected as the model contaminant in the feed liquid device 1. Pump 3 was an electromagnetic pump with a flow rate of 1 L / min, and membrane module 2 was an ultrafiltration cup. The initial pressure was set to 2 bar. An ultrafiltration membrane with an initial flux of 80-120 LMH was used for membrane fouling experiments. After pre-pressurizing with pure water for 30 min, the oil-water emulsion was introduced. During the pulse process, solenoid valve 6 was set to constant pressure filtration for 9 s; pressure was then eliminated for 1 s by opening solenoid valve 6; and then constant pressure filtration at 2 bar was achieved by closing solenoid valve 6 for 9 s; this cycle was repeated.

[0024] The results showed that after 90 minutes of operation, the emulsion flux attenuation rate under pulse pressure control was 20%. Figure 3 As shown; under constant pressure filtration conditions, the emulsion flux attenuation rate is 75%, as... Figure 2 .

[0025] In at least one embodiment, the valve 4 and the feed liquid device 1 are provided with a pressure display device 7 for displaying the hydraulic pressure from the membrane module 2 into the feed liquid device 1. The valve 4 can be a ball valve or a pneumatic back pressure valve, both of which can provide better observation and control of the flow path. The laboratory pulse pressure control cross-flow filtration device provides accurate pressure change simulation and improves the effect of cross-flow filtration.

[0026] In at least one embodiment, the pressure display device 7 is a pressure gauge, used to conveniently observe the pressure on the branch of valve 4.

[0027] In at least one embodiment, the solenoid valve 6 is a normally closed solenoid valve. When the normally closed solenoid valve is not energized, it is closed, and the liquid cannot pass through. When the normally closed solenoid valve is energized, the solenoid valve opens within a few milliseconds, creating a passage, and the liquid can pass through.

[0028] In at least one embodiment, the control device 7 is a PLC control device, and the pump 3 is an electromagnetic pump, gear pump, peristaltic pump, or diaphragm pump. The control device 7 can control the opening and closing time of the solenoid valve, so as to better realize the pulse pressure change of the circuit pressure, provide accurate pressure change simulation for the pulse pressure control cross-flow filter device of this utility model, and improve the experimental effect.

[0029] In at least one embodiment, the diversion device 5 is a three-way valve, or it can be a diverter with a three-way flow structure, as long as it can achieve diversion, and is not limited to existing standard parts and components with this function.

[0030] In at least one embodiment, the membrane module 2 is an ultrafiltration cup or a cross-flow module, which can effectively simulate the effect of cross-flow filtration.

[0031] The cross-flow filtration device of this invention connects a solenoid valve between the diversion device and the feed liquid device, thereby forming a pipeline pressure pulse flow path at the inlet of the membrane module, realizing the formation of intermittent pressure pulses on the ultrafiltration membrane in the membrane module. Based on the mechanism of alleviating concentration polarization and potential "dielectric surge" anti-fouling, it effectively improves the anti-fouling performance of the ultrafiltration membrane against oil and water.

Claims

1. A pulsatile pressure controlled crossflow filtration apparatus for laboratory use, comprising a feed liquid device (1) and a membrane module (2), said feed liquid device (1) providing feed liquid to the membrane module (2) by means of a pump (3), said membrane module (2) providing circulation liquid to said feed liquid device (1) by means of a valve (4) and a pipe, characterized in that: A shunt device (5) is arranged on the pipeline between the pump (3) and the membrane assembly (2), an electromagnetic valve (6) is connected between the shunt device (5) and the feed liquid device (1), and then a pipeline pressure pulse flow path is formed at the inlet of the membrane assembly (2), the electromagnetic valve (6) is connected to a control device (7), and the control device (7) controls the opening or closing of the electromagnetic valve (6) to realize pulse filtration simulation to the membrane in the membrane assembly (2).

2. The laboratory pulsatile pressure controlled crossflow filtration device of claim 1, wherein: The valve (4) and the feed liquid device (1) are provided with a pressure display device (8), and the valve (4) is a ball valve or a pneumatic back pressure valve.

3. The laboratory pulsatile pressure controlled crossflow filtration device of claim 2, wherein: The pressure display device (8) is a pressure gauge.

4. The laboratory pulsatile pressure controlled crossflow filtration device of claim 3, wherein: The electromagnetic valve (6) is a normally closed electromagnetic valve.

5. The laboratory pulsatile pressure controlled crossflow filtration device of claim 4, wherein: The control device (7) is a PLC control device, and the pump (3) is an electromagnetic pump, a gear pump, a peristaltic pump or a diaphragm pump.

6. The laboratory pulsatile pressure controlled crossflow filtration device of claim 4, wherein: The shunt device (5) is a three-way valve.

7. The laboratory pulsatile pressure controlled crossflow filtration device according to any one of claims 1-6, characterized in that: The membrane assembly (2) is an ultrafiltration membrane assembly.

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