Ultrasonic-assisted membrane distillation system and processing method

Abstract

This invention discloses an ultrasonic-assisted membrane distillation system, comprising a liquid supply device for providing raw water; an ultrasonic-assisted membrane distillation assembly including multiple circulating filtration components, with adjacent circulating filtration components connected together, and the circulating filtration component at the starting end connected to the liquid supply device; and a liquid storage device, with at least a portion of the circulating filtration components connected to the liquid storage device. This invention also discloses a processing method for the ultrasonic-assisted membrane distillation system, wherein the ultrasonic-assisted membrane distillation system is the aforementioned ultrasonic-assisted membrane distillation system. The ultrasonic-assisted membrane distillation system and processing method disclosed in this invention can solve the problem of poor performance in existing membrane distillation systems.

Description

Technical Field

[0001] This invention belongs to the technical field of coal mine water treatment, specifically relating to an ultrasonic-assisted membrane distillation system and treatment method. Background Technology

[0002] In November 2020, the Ministry of Ecology and Environment, the National Development and Reform Commission, and the National Energy Administration jointly issued the "Notice on Further Strengthening the Management of Environmental Impact Assessment for Coal Resource Development," which clearly stipulates that if mine water needs to be discharged after full utilization, the water quality should meet or exceed the corresponding values ​​of surface water environmental quality stipulated in the environmental functional zoning of the receiving water body, and the salinity should not exceed 1000 mg / L. However, high-mineralized mine water (generally referring to mine water with a salinity higher than 1000 mg / L) is mainly concentrated in the western region of my country, which is extremely water-scarce, has a relatively fragile natural ecology, but is rich in coal resources. The volume of this water is enormous and its distribution is widespread. Therefore, under the current background of "zero discharge" and the reverse distribution of coal and water resources, if high-mineralized mine water is discharged directly without proper treatment, it will not only cause incalculable damage to the local ecological environment and industrial and agricultural production, but also contradict national policy requirements, ultimately hindering the green development of coal and even the construction of ecological civilization in western mining areas.

[0003] Desalination technology for high-mineralization mine water aims to reduce the total dissolved solids in mine water to achieve water reuse. It is mainly divided into two categories: thermal methods and membrane methods. Thermal methods have certain limitations due to the need to introduce steam, therefore membrane desalination is widely used in high-mineralization mine water desalination and has shown a wider range of applications. Furthermore, western my country's mining areas are rich in geothermal resources, and geothermal energy has the potential to be coupled with thermal membrane technologies such as membrane distillation. However, when treating high-mineralization wastewater (especially containing easily scale-forming ions such as calcium and magnesium), membrane distillation technology, due to its high concentration ratio, is prone to inorganic scale deposition on the hydrophobic membrane surface, causing membrane wetting. This prevents the hydrophobic membrane from retaining ions in the water, rendering the entire process ineffective. Currently, descaling processes mainly include physical and chemical methods. Physical methods are more popular than chemical methods because they are more environmentally friendly as they do not require the addition of chemical reagents. A common physical method is to introduce an ultrasonic field. The cavitation effect generated by ultrasound makes it difficult for inorganic scale to deposit on the membrane surface, ensuring the stability of the membrane distillation process. Current technologies simply place the membrane distillation system within an ultrasonic field, adjusting the ultrasonic frequency and intensity to test whether ultrasonic technology can effectively alleviate the scaling tendency of calcium and magnesium ions in water. Furthermore, the optimal ultrasonic control parameters are determined through characterization methods and long-term membrane performance evaluation experimental data to improve the stability of the membrane distillation process.

[0004] Existing technologies only use ultrasound of a single frequency or intensity to alleviate the water flux reduction caused by scaling in water bodies. As a result, ultrasound treatment is also applied to water bodies with relatively low concentrations and that are not prone to scaling. The descaling effect is not obvious, but energy consumption is increased.

[0005] Therefore, it is necessary to improve existing technologies to overcome their shortcomings. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is that existing membrane distillation systems have poor performance.

[0007] To solve the above-mentioned technical problems, the present invention provides an ultrasonic-assisted membrane distillation system, which includes a liquid supply device for supplying raw water; an ultrasonic-assisted membrane distillation assembly including multiple circulating filter components, with adjacent circulating filter components connected in series, and the circulating filter component located at the starting end connected in series with the liquid supply device; and a liquid storage device, with at least a portion of the circulating filter components connected in series with the liquid storage device.

[0008] Optionally, the circulating filtration assembly includes a sub-shell; a hydrophobic membrane disposed inside the sub-shell and dividing the interior of the sub-shell into a raw water area and a fresh water area; and an ultrasonic generator disposed inside the raw water area.

[0009] Optionally, the frequency of the ultrasonic generator decreases sequentially from the initial circulating filter assembly to the final circulating filter assembly; and / or the concentration of the raw water in the multiple circulating filter assemblies increases sequentially from the initial to the final assembly.

[0010] Optionally, the ultrasonic-assisted membrane distillation assembly further includes a first circulation pipeline, which has a first supply pipe and a first return pipe. The supply pipe is connected to the raw water area of ​​the starting end circulation filter assembly through the first supply pipe. One end of the first return pipe is connected to the raw water area of ​​the starting end circulation filter assembly, and the other end of the first return pipe is connected to the first supply pipe. The first circulation pipeline and the raw water area form a circulation loop. A second circulation pipeline has a second supply pipe and a second return pipe. The second supply pipe and the second return pipe are both arranged between the raw water areas of two adjacent circulation filter assemblies. The second supply pipe, the raw water area, and the second return pipe form a circulation loop.

[0011] Optionally, the ultrasonic-assisted membrane distillation assembly also includes a sensor, with sensors installed on both the first and second supply pipes; a flow meter, with flow meters installed on both the first and second reflux pipes; a check valve, with a check valve installed on both the first and second supply pipes; a pump body, installed on the first supply pipe to provide driving force for liquid flow; and a controller, electrically connected to the sensor, check valve, ultrasonic generator, pump body, and flow meter.

[0012] Optionally, the multiple circulating filtration components include a first circulating filtration component, a second circulating filtration component, and a third circulating filtration component. The first circulating filtration component has a first raw water area and a first fresh water area. The second circulating filtration component has a second raw water area and a second fresh water area. The third circulating filtration component has a third raw water area and a third fresh water area. The first fresh water area, the second fresh water area, and the third fresh water area are all connected to the liquid storage device. The liquid supply device is connected to the first raw water area. The outlet of the first raw water area is connected to the inlet of the first raw water area and the inlet of the second raw water area, respectively. The outlet of the second raw water area is connected to the inlet of the first raw water area and the inlet of the third raw water area. The outlet of the third raw water area is connected to the inlet of the second raw water area and the liquid storage device.

[0013] Optionally, a first three-way control valve is provided at the outlet end of the first raw water area, a second three-way control valve is provided at the outlet end of the second raw water area, and a third three-way control valve is provided at the outlet end of the third raw water area; the outlet end of the first raw water area is connected to the inlet end of the first raw water area and the inlet end of the second raw water area respectively through the first three-way control valve; the outlet end of the second raw water area is connected to the inlet end of the first raw water area and the inlet end of the third raw water area respectively through the second three-way control valve; the outlet end of the third raw water area is connected to the inlet end of the second raw water area and the liquid storage device respectively through the third three-way control valve; all three three-way control valves are electrically connected to the controller.

[0014] Optionally, the ultrasonic generator is a dot matrix ultrasonic generator.

[0015] Optionally, the liquid supply device includes a raw water storage tank for supplying raw water; and a heating component through which the raw water flows to a circulating filtration component.

[0016] Optionally, the liquid storage device includes a concentrate recovery tank and a freshwater recovery tank. The concentrate recovery tank is connected to the raw water area of ​​the circulating filter assembly at the tail end, and the freshwater area is connected to the freshwater area of ​​each circulating filter assembly.

[0017] The present invention also provides a processing method for an ultrasound-assisted membrane distillation system, wherein the ultrasound-assisted membrane distillation system is the aforementioned ultrasound-assisted membrane distillation system, and the processing method for the ultrasound-assisted membrane distillation system includes:

[0018] Preheating involves preheating the raw water.

[0019] The preheated raw water enters the circulating filter assembly at the starting end;

[0020] Collect raw water flow information to determine whether to perform a circulation operation;

[0021] When it is determined that the circulation operation will not be performed, the raw water enters the interior of the next circulation filter component and the ultrasonic generator is activated.

[0022] Optionally, before the preheating step, the process includes collecting raw water and storing it inside the raw water storage tank of the supply device of the ultrasonic-assisted membrane distillation system.

[0023] Optionally, in the preheating step, the raw water flows through the heating component of the liquid supply device of the ultrasonic-assisted membrane distillation system to heat the raw water.

[0024] Optionally, the step of collecting raw water flow information and determining whether to perform a circulation operation includes: the raw water from the supply device enters the circulation filter assembly at the starting end after passing through the pump body; the pump body detects the initial flow rate of the raw water; the flow meter of the ultrasonic-assisted membrane distillation assembly detects the first flow rate at the outlet end of the raw water area and sends it to the controller; the ratio of the first flow rate to the initial flow rate is compared with a preset threshold; when the ratio of the first flow rate to the initial flow rate is greater than the threshold, a circulation operation is performed, at which time the raw water at the outlet end of the raw water area flows back to the raw water area, and the ultrasonic generator is not activated; when the ratio of the first flow rate to the initial flow rate is equal to the threshold, the ultrasonic generator of the circulation filter assembly at the starting end is activated, and the second flow rate at the outlet end of the raw water area is detected; when the ratio of the second flow rate to the first flow rate is greater than the threshold... When the ratio of the second flow rate to the first flow rate equals the threshold, the ultrasonic generator of the next circulating filter component is activated, and the raw water in the raw water area flows from the outlet to the interior of the raw water area of ​​the next circulating filter component. The third flow rate at the outlet of the raw water area of ​​the next circulating filter component is detected, and the ratio of the third flow rate to the second flow rate is compared with the preset threshold. When the ratio of the third flow rate to the second flow rate is greater than the threshold, the circulating operation is performed, and the raw water in the raw water area flows from the outlet to the interior of the raw water area of ​​the next circulating filter component. When the ratio of the third flow rate to the second flow rate equals the threshold, the ultrasonic generator of the next circulating filter component is activated, and the raw water in the raw water area flows from the outlet to the interior of the raw water area of ​​the next circulating filter component.

[0025] Optionally, the steps of collecting raw water flow information and determining whether to perform a circulation operation also include a step of detecting the salinity of the raw water. The salinity of the raw water is detected by a sensor of the ultrasonic-assisted membrane distillation system, so as to control the number of ultrasonic generators to be turned on based on the salinity.

[0026] Optionally, the processing method of the ultrasonic-assisted membrane distillation system further includes the step of collecting the liquid inside the circulating filter assembly at the tail end, wherein when the ratio of the tail end flow rate of the raw water inside the circulating filter assembly to the flow rate of the raw water inside the previous circulating filter assembly is equal to a threshold, the raw water inside the circulating filter assembly at the tail end enters the concentrate recovery tank of the liquid storage device of the ultrasonic-assisted membrane distillation system.

[0027] The technical solution provided by this invention has the following advantages:

[0028] The ultrasonic-assisted membrane distillation system provided by the present invention includes a liquid supply device, an ultrasonic-assisted membrane distillation assembly, and a liquid storage device. The liquid supply device is used to supply raw water. The ultrasonic-assisted membrane distillation assembly includes multiple circulating filtration assemblies. Two adjacent circulating filtration assemblies are connected. The circulating filtration assembly at the starting end is connected to the liquid supply device, and the circulating filtration assembly at the tail end is connected to the liquid storage device.

[0029] As can be seen from the above, this application has multiple circulating filter components, and adjacent circulating filter components are connected to each other, so that the raw water is circulated and treated inside the circulating filter component, then flows to the adjacent circulating filter component for further circulation and treatment, and finally the concentrated raw water inside the end circulating filter component is collected and treated.

[0030] This application achieves segmented processing by setting up multiple circulating filter components, which is suitable for different frequency scenarios of different ultrasonic generators, increases the stability of concentration, improves the concentration ratio, and reduces power consumption. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the ultrasonic-assisted membrane distillation system provided by the present invention;

[0033] Figure 2 A flowchart illustrating the processing method of the ultrasonic-assisted membrane distillation system provided by the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 10. Liquid supply device; 20. Heating component; 310. Concentrate recovery tank; 320. Freshwater recovery tank; 40. Pump body; 50. Ultrasonic generator; 60. Hydrophobic membrane; 70. Check valve; 80. Sensor; 90. Flow meter; 110. Three-way control valve. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0038] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0039] This invention solves the problem of poor performance in existing membrane distillation systems.

[0040] Example 1

[0041] This embodiment provides an ultrasonic-assisted membrane distillation system, such as Figure 1 As shown, the ultrasonic-assisted membrane distillation system includes a liquid supply device 10, an ultrasonic-assisted membrane distillation assembly, and a liquid storage device. The liquid supply device 10 is used to supply raw water. The ultrasonic-assisted membrane distillation assembly includes multiple circulating filter components. Two adjacent circulating filter components are connected. The circulating filter component at the starting end is connected to the liquid supply device 10, and the circulating filter component at the tail end is connected to the liquid storage device.

[0042] Specifically, this application has multiple circulating filtration components, and adjacent circulating filtration components are connected to each other, so that after the raw water is circulated and treated inside the circulating filtration component, it flows to the adjacent circulating filtration component for circulation and treatment again, and finally the concentrated raw water inside the circulating filtration component at the end is collected and treated.

[0043] Furthermore, the existing technology requires maintaining high-intensity ultrasonic processing, which results in high power consumption. This application achieves segmented processing by setting up multiple circulating filter components, which is suitable for different frequency scenarios of different ultrasonic generators 50, increases the stability of concentration, improves the concentration ratio, and reduces power consumption.

[0044] It should be noted that, in order to ensure the stability of liquid treatment, the ultrasonic-assisted membrane distillation assembly includes an outer shell, which has a housing space, and multiple circulating filter components are arranged inside the housing space.

[0045] In this embodiment, the raw water is the wastewater. After the wastewater is continuously concentrated by the circulating filtration components, the concentration of the raw water in the multiple circulating filtration components increases sequentially from the starting end to the end. The concentrated raw water in the circulating filtration components at the end is collected into the storage device.

[0046] like Figure 1 As shown, the circulating filtration assembly includes a sub-shell, a hydrophobic membrane 60, and an ultrasonic generator 50. The hydrophobic membrane 60 is disposed inside the sub-shell and divides the interior of the sub-shell into a raw water area and a fresh water area; the ultrasonic generator 50 is disposed inside the raw water area.

[0047] Specifically, raw water enters the raw water zone, and the fresh water portion of the raw water permeates through the hydrophobic membrane 60 into the fresh water zone to achieve raw water concentration. An ultrasonic generator 50 is then installed to further separate the fresh water from the raw water, enhancing the concentration efficiency.

[0048] Furthermore, the ultrasonic generator 50 is a matrix ultrasonic generator 50, and the number and arrangement of the matrix ultrasonic generators 50 can be adaptively adjusted according to the water quality of the raw water.

[0049] In this embodiment, the frequency of the ultrasonic generator 50 decreases sequentially from the starting end of the circulating filter assembly to the ending end of the circulating filter assembly. That is, the ultrasonic generator 50 at the starting end is a high-frequency ultrasonic generator 50, the adjacent one is a medium-frequency ultrasonic generator 50, and the one at the ending end is a low-frequency ultrasonic generator 50.

[0050] It should be noted that high frequency, medium frequency and low frequency are relative terms, and the specific frequency values ​​decrease gradually from the beginning to the end.

[0051] like Figure 1As shown, the ultrasonic-assisted membrane distillation assembly also includes a first circulation pipeline and a second circulation pipeline. The first circulation pipeline has a first supply pipe and a first return pipe. The supply device 10 is connected to the raw water area of ​​the circulating filter assembly at the starting end through the first supply pipe. One end of the first return pipe is connected to the raw water area of ​​the circulating filter assembly at the starting end, and the other end of the first return pipe is connected to the first supply pipe. The first circulation pipeline and the raw water area form a circulation loop. The second circulation pipeline has a second supply pipe and a second return pipe. The second supply pipe and the second return pipe are both arranged between the raw water areas of two adjacent circulating filter assemblies. The second supply pipe, the raw water area, and the second return pipe form a circulation loop.

[0052] Specifically, by forming a circulation loop, the raw water is circulated and treated, and the raw water is continuously concentrated. The liquid supply device 10 supplies raw water to the raw water area of ​​the circulation filter component at the starting end through the first liquid supply pipeline. One end of the second liquid supply pipeline is connected to the raw water area of ​​the upstream circulation filter component, so that the raw water inside the upstream raw water area can enter the interior of the raw water area.

[0053] Furthermore, to ensure the controllability of the flow, solenoid valves can be installed on the first and second liquid supply pipes to control the on / off state; similarly, solenoid valves can be installed on the first and second return pipes to control the on / off state.

[0054] When the second liquid supply pipeline is connected to the return liquid pipe of the upstream circulating filter component, a three-way control valve 110 can be installed on the upstream return liquid pipe to control the flow direction of the raw water by adjusting the three-way control valve 110.

[0055] In this embodiment, a one-way valve 70 is provided on the first liquid inlet pipe and the second liquid inlet pipe to realize the one-way flow of liquid; a pump body 40 is also provided on the first liquid supply pipe to provide the liquid flow force through the pump body 40, wherein the pump body 40 of this application has a flow detection function to detect the flow rate of the raw water flowing out of the liquid supply device 10.

[0056] Furthermore, the ultrasonic-assisted membrane distillation assembly also includes a sensor 80. Sensors 80 are installed on both the first and second supply pipes, and are used to detect the salt content in the raw water. The sensor 80 is positioned where the first supply pipe connects to the raw water area to detect the salt content of the raw water entering the raw water area; similarly, the sensor 80 is positioned where the second supply pipe connects to the raw water area.

[0057] Furthermore, the ultrasonic-assisted membrane distillation assembly also includes a flow meter 90, which is installed on both the first and second reflux pipes. The flow meter 90 is located at the connection point between the outlet end of the raw water area and the first and second reflux pipes to facilitate the detection of the flow rate of the raw water.

[0058] In this application, the ultrasonic-assisted membrane distillation assembly also includes a controller, which is electrically connected to a sensor 80, a one-way valve 70, a three-way control valve 110, an ultrasonic generator 50, a pump body 40, and a flow meter 90. The controller receives electrical signals from the sensor 80 and the flow meter 90, and controls the operation of the one-way valve 70, the three-way control valve 110, the ultrasonic generator 50, and the pump body 40.

[0059] The following example uses the first circulating filter component at the beginning and the third circulating filter component at the end as an example.

[0060] Specifically, the multiple circulating filtration components include a first circulating filtration component, a second circulating filtration component, and a third circulating filtration component. The first circulating filtration component has a first raw water area and a first fresh water area. The second circulating filtration component has a second raw water area and a second fresh water area. The third circulating filtration component has a third raw water area and a third fresh water area. The first fresh water area, the second fresh water area, and the third fresh water area are all connected to the liquid storage device. The liquid supply device 10 is connected to the first raw water area. The outlet of the first raw water area is connected to the inlet of the first raw water area and the inlet of the second raw water area, respectively. The outlet of the second raw water area is connected to the inlet of the first raw water area and the inlet of the third raw water area. The outlet of the third raw water area is connected to the inlet of the second raw water area and the liquid storage device.

[0061] Furthermore, the liquid supply device 10 and the first circulating filter assembly form a first circulating loop, the first circulating filter assembly and the second circulating filter assembly form a second circulating loop, and the second circulating filter assembly and the third circulating filter assembly form a third circulating loop.

[0062] Furthermore, the three-way control valve 110 has a first three-way control valve, a second three-way control valve and a third three-way control valve. The first three-way control valve is provided at the outlet end of the first raw water area, the second three-way control valve is provided at the outlet end of the second raw water area, and the third three-way control valve is provided at the outlet end of the third raw water area.

[0063] In this embodiment, the outlet of the first raw water region is connected to the inlet of both the first and second raw water regions via a first three-way control valve. The outlet of the second raw water region is connected to both the inlet of the first and third raw water regions via a second three-way control valve. The outlet of the third raw water region is connected to both the inlet of the second raw water region and the storage device via a third three-way control valve. All three three-way control valves are electrically connected to the controller. The controller controls the opening and closing of the three-way solenoid valves to control the direction of fluid flow, enabling switching between circulating flow and flow to the next circulating filter component.

[0064] like Figure 1 As shown, the liquid supply device 10 includes a raw water storage tank and a heating component 20. The raw water storage tank is used to supply raw water, and the raw water flows to the circulating filtration component through the heating component 20.

[0065] Specifically, the heating component 20 heats the raw water, and the heated raw water flows into the interior of the circulation filter component at the starting end to improve the concentration of the raw water.

[0066] Furthermore, the heating component 20 can be an electric heater, heat exchanger, or other structural component capable of heating the raw water.

[0067] In this embodiment, the liquid storage device includes a concentrate recovery tank 310 and a freshwater recovery tank 320. The concentrate recovery tank 310 is connected to the raw water area of ​​the circulating filter assembly at the tail end, and the freshwater area is connected to the freshwater area of ​​each circulating filter assembly to collect freshwater.

[0068] Example 2

[0069] This embodiment provides a processing method for an ultrasound-assisted membrane distillation system, wherein the ultrasound-assisted membrane distillation system is the ultrasound-assisted membrane distillation system in Embodiment 1.

[0070] like Figure 2 As shown, the processing method of the ultrasound-assisted membrane distillation system includes:

[0071] Preheating involves preheating the raw water.

[0072] The preheated raw water enters the circulating filter assembly at the starting end;

[0073] Collect raw water flow information to determine whether to perform a circulation operation;

[0074] When it is determined that the circulation operation will not be performed, the raw water enters the interior of the next circulation filter component and the ultrasonic generator 50 is activated.

[0075] The process includes collecting raw water before the preheating step, storing the raw water inside the raw water storage tank of the supply device 10 of the ultrasonic-assisted membrane distillation system, and supplying raw water to the circulating filtration assembly through the raw water storage tank.

[0076] Furthermore, in the preheating step, the raw water flows through the heating component 20 of the liquid supply device 10 of the ultrasonic-assisted membrane distillation system to heat the raw water, and the preheating temperature is not less than 40°C.

[0077] Furthermore, in the step of collecting raw water flow information and determining whether to perform circulation operation, the raw water from the supply device 10 enters the circulation filter assembly at the starting end after passing through the pump body 40, and the pump body 40 detects the initial flow rate of the raw water.

[0078] Sensor 80 detects the salt content of the raw water inside the raw water area of ​​the circulating filter assembly at the starting end. Flow meter 90 detects the first flow rate of the raw water at the outlet end of the raw water area and sends it to the controller. The ratio of the first flow rate to the initial flow rate is compared with a preset threshold. When the ratio of the first flow rate to the initial flow rate is greater than the threshold, a circulation operation is performed. The controller controls the three-way control valve 110 to make the liquid flow towards the inlet end of the raw water area of ​​the circulating filter assembly at the starting end. At this time, the raw water at the outlet end of the raw water area flows back to the raw water area, and the ultrasonic generator 50 is not started. When the ratio of the first flow rate to the initial flow rate equals the threshold, the ultrasonic generator 50 of the initial circulating filter assembly is activated, and the second flow rate at the outlet of the raw water area is detected. When the ratio of the second flow rate to the first flow rate is greater than the threshold, a circulation operation is performed. The controller controls the three-way control valve 110 to make the liquid flow towards the inlet of the raw water area of ​​the initial circulating filter assembly. At this time, the raw water at the outlet of the raw water area flows back to the raw water area. When the ratio of the second flow rate to the first flow rate equals the threshold, the ultrasonic generator 50 of the next circulating filter assembly is activated, and the controller controls the three-way control valve 110 to make the liquid flow towards the inlet of the raw water area of ​​the next circulating filter assembly. The raw water in the raw water area flows from the outlet to the interior of the raw water area of ​​the next circulating filter assembly.

[0079] The third flow rate at the outlet of the raw water area of ​​the next circulating filter component is detected. The ratio of the third flow rate to the second flow rate is compared with a preset threshold. When the ratio of the third flow rate to the second flow rate is greater than the threshold, the circulation operation is performed, and the raw water at the outlet of the raw water area flows back to the raw water area. When the ratio of the third flow rate to the second flow rate is equal to the threshold, the ultrasonic generator 50 of the next circulating filter component is activated, and the raw water in the raw water area flows from the outlet to the interior of the raw water area of ​​the next circulating filter component.

[0080] In this embodiment, the steps of collecting raw water flow information and determining whether to perform a circulation operation also include a step of detecting the salinity of the raw water. The salinity of the raw water is detected by the sensor 80 of the ultrasonic-assisted membrane distillation system, so as to control the number and power of the ultrasonic generator 50 to be turned on according to the salinity, and to make specific adaptive settings according to the water quality.

[0081] The treatment method of the ultrasonic-assisted membrane distillation system also includes the step of collecting the liquid inside the circulating filter assembly at the tail end. When the ratio of the flow rate of the raw water inside the circulating filter assembly at the tail end to the flow rate of the raw water inside the previous circulating filter assembly equals a threshold, the raw water inside the circulating filter assembly at the tail end enters the concentrate recovery tank 310 of the liquid storage device of the ultrasonic-assisted membrane distillation system.

[0082] In this process, freshwater from the freshwater area flows into the freshwater storage tank in real time.

[0083] In this embodiment, the threshold setting can be adaptively set according to demand and water quality.

[0084] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0085] 1. This application has multiple circulating filtration components, and adjacent circulating filtration components are connected to each other, so that the raw water is circulated and treated inside the circulating filtration component, then flows to the adjacent circulating filtration component for further circulation and treatment, and finally the concentrated raw water inside the end circulating filtration component is collected and treated.

[0086] 2. This application achieves segmented processing by setting up multiple circulating filter components, which is suitable for different frequency scenarios of different ultrasonic generators 50, increases the stability of concentration, improves the concentration ratio, and reduces power consumption.

[0087] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. Based on the embodiments of the present invention, those skilled in the art can make other variations or modifications without creative effort, and all such variations or modifications should fall within the scope of protection of the present invention.

Claims

1. A processing method for an ultrasonic-assisted membrane distillation system, characterized in that, The ultrasonic-assisted membrane distillation system includes: a liquid supply device (10) for supplying raw water; an ultrasonic-assisted membrane distillation assembly including multiple circulating filtration assemblies, with adjacent circulating filtration assemblies connected in series, and the circulating filtration assembly located at the starting end connected in series with the liquid supply device (10); and a liquid storage device, with at least a portion of the circulating filtration assemblies connected in series with the liquid storage device; the processing method of the ultrasonic-assisted membrane distillation system includes: Preheating involves preheating the raw water. The preheated raw water enters the circulating filter assembly at the starting end; Collect raw water flow information to determine whether to perform a circulation operation; When it is determined that the circulation operation will not be performed, the raw water enters the interior of the next circulation filter component and the ultrasonic generator (50) is activated. The step of collecting raw water flow information and determining whether to perform a circulation operation includes: The raw water from the liquid supply device (10) enters the circulating filter assembly at the starting end after passing through the pump body (40), and the pump body (40) detects the initial flow rate of the raw water. The flow meter (90) of the ultrasonic-assisted membrane distillation assembly detects the first flow rate at the outlet of the raw water area of ​​the circulating filtration assembly and sends it to the controller. The ratio of the first flow rate to the initial flow rate is compared with a preset threshold. When the ratio of the first flow rate to the initial flow rate is greater than the threshold, a circulation operation is performed. At this time, the raw water at the outlet of the raw water area flows back to the raw water area, and the ultrasonic generator (50) is not started. When the ratio of the first flow rate to the initial flow rate is equal to the threshold, the ultrasonic generator (50) of the circulating filtration assembly at the starting end is started, and the second flow rate at the outlet of the raw water area is detected. When the ratio of the second flow rate to the first flow rate is greater than the threshold, a circulation operation is performed. At this time, the raw water at the outlet of the raw water area flows back to the raw water area. When the ratio of the second flow rate to the first flow rate is equal to the threshold, the ultrasonic generator (50) of the next circulating filtration assembly is started, and the raw water in the raw water area flows from the outlet to the interior of the raw water area of ​​the next circulating filtration assembly. The third flow rate at the outlet of the raw water region of the next circulating filter component is detected, and the ratio of the third flow rate to the second flow rate is compared with a preset threshold. When the ratio of the third flow rate to the second flow rate is greater than the threshold, a circulation operation is performed, and the raw water at the outlet of the raw water region flows back to the raw water region. When the ratio of the third flow rate to the second flow rate is equal to the threshold, the ultrasonic generator (50) of the next circulating filter component is activated, and the raw water in the raw water region flows from the outlet to the interior of the raw water region of the next circulating filter component.

2. The processing method of the ultrasonic-assisted membrane distillation system according to claim 1, characterized in that, The circulating filtration component includes: Subshell; A hydrophobic membrane (60) is disposed inside the sub-shell and divides the interior of the sub-shell into a raw water area and a fresh water area; An ultrasonic generator (50) is disposed inside the raw water area.

3. The processing method of the ultrasonic-assisted membrane distillation system according to claim 2, characterized in that, Along the circulating filter assembly from the starting end to the ending end, the frequency of the ultrasonic generator (50) decreases sequentially; and / or The concentration of raw water in the multiple circulating filter components increases sequentially from the starting end to the ending end.

4. The processing method of the ultrasonic-assisted membrane distillation system according to claim 2, characterized in that, The ultrasound-assisted membrane distillation assembly further includes: The first circulation pipeline has a first supply pipe and a first return pipe. The supply device (10) is connected to the raw water area of ​​the circulation filter assembly at the starting end through the first supply pipe. One end of the first return pipe is connected to the raw water area of ​​the circulation filter assembly at the starting end, and the other end of the first return pipe is connected to the first supply pipe. The first circulation pipeline and the raw water area form a circulation loop. The second circulation pipeline has a second supply pipe and a second return pipe. The second supply pipe and the second return pipe are both arranged between the raw water areas of two adjacent circulation filter components. The second supply pipe, the raw water area, and the second return pipe form a circulation loop.

5. The processing method of the ultrasonic-assisted membrane distillation system according to claim 4, characterized in that, The ultrasound-assisted membrane distillation assembly further includes: Sensor (80) is provided on both the first liquid supply pipe and the second liquid supply pipe. Flow meter (90) is provided on both the first return pipe and the second return pipe. One-way valve (70), both the first liquid supply pipe and the second liquid supply pipe are equipped with the one-way valve (70); Pump body (40), the pump body (40) is disposed on the first liquid supply pipe to provide driving force for liquid flow; The controller is electrically connected to the sensor (80), the one-way valve (70), the ultrasonic generator (50), the pump body (40), and the flow meter (90).

6. The processing method of the ultrasonic-assisted membrane distillation system according to claim 4, characterized in that, The plurality of circulating filtration components include a first circulating filtration component, a second circulating filtration component, and a third circulating filtration component. The first circulating filtration component has a first raw water area and a first fresh water area. The second circulating filtration component has a second raw water area and a second fresh water area. The third circulating filtration component has a third raw water area and a third fresh water area. The first fresh water area, the second fresh water area, and the third fresh water area are all connected to the liquid storage device. The liquid supply device (10) is connected to the first raw water area, and the liquid outlet of the first raw water area is connected to the liquid inlet of the first raw water area and the liquid inlet of the second raw water area, respectively. The outlet of the second raw water region is connected to the inlet of the first raw water region and the inlet of the third raw water region; The outlet of the third raw water region is connected to the inlet of the second raw water region and the storage device.

7. The processing method of the ultrasonic-assisted membrane distillation system according to claim 6, characterized in that, The first raw water area is equipped with a first three-way control valve at the outlet end, the second raw water area is equipped with a second three-way control valve at the outlet end, and the third raw water area is equipped with a third three-way control valve at the outlet end. The outlet of the first raw water area is connected to the inlet of the first raw water area and the inlet of the second raw water area respectively through the first three-way control valve; The outlet of the second raw water area is connected to the inlet of the first raw water area and the inlet of the third raw water area respectively through the second three-way control valve; The outlet of the third raw water region is connected to the inlet of the second raw water region and the storage device through the third three-way control valve. The first three-way control valve, the first three-way control valve, and the first three-way control valve are all electrically connected to the controller of the ultrasonic-assisted membrane distillation assembly.

8. The processing method of the ultrasonic-assisted membrane distillation system according to claim 2, characterized in that, The ultrasonic generator (50) is a dot matrix ultrasonic generator (50).

9. The processing method of the ultrasonic-assisted membrane distillation system according to any one of claims 1 to 8, characterized in that, The liquid supply device (10) includes: Raw water storage tank, the raw water storage tank being used to supply raw water; Heating component (20), through which the raw water flows to the circulating filter component.

10. The processing method of the ultrasonic-assisted membrane distillation system according to any one of claims 1 to 8, characterized in that, The liquid storage device includes a concentrate recovery tank (310) and a freshwater recovery tank (320). The concentrate recovery tank (310) is connected to the raw water area of ​​the circulating filter assembly at the tail end, and the freshwater recovery tank (320) is connected to the freshwater area of ​​each of the circulating filter assemblies.

11. The processing method of the ultrasonic-assisted membrane distillation system according to any one of claims 1 to 8, characterized in that, Prior to the preheating step, raw water is collected and stored inside the raw water storage tank of the liquid supply device (10) of the ultrasonic-assisted membrane distillation system.

12. The processing method of the ultrasonic-assisted membrane distillation system according to any one of claims 1 to 8, characterized in that, In the preheating step, the raw water flows through the heating component (20) of the liquid supply device (10) of the ultrasonic-assisted membrane distillation system to heat the raw water.

13. The processing method of the ultrasonic-assisted membrane distillation system according to any one of claims 1 to 8, characterized in that, The step of collecting the flow rate information of the raw water and determining whether to perform the circulation operation also includes the step of detecting the salt content of the raw water. The salt content of the raw water is detected by the sensor (80) of the ultrasonic-assisted membrane distillation system, so as to control the number of ultrasonic generators (50) to be turned on according to the salt content.

14. The processing method of the ultrasonic-assisted membrane distillation system according to any one of claims 1 to 8, characterized in that, The processing method of the ultrasonic-assisted membrane distillation system further includes the step of collecting the liquid inside the circulating filter assembly at the tail end, wherein when the ratio of the tail end flow rate of the raw water inside the circulating filter assembly at the tail end to the flow rate of the raw water inside the previous circulating filter assembly is equal to a threshold, the raw water inside the circulating filter assembly at the tail end enters the concentrate recovery tank (310) of the liquid storage device of the ultrasonic-assisted membrane distillation system.

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