Membrane distillation device based on semiconductor technology

Abstract

The utility model discloses a membrane distillation device based on a semiconductor technology. The device at least comprises a shell, a membrane assembly is arranged in the shell, the peripheral side of the membrane assembly and the shell are arranged in an air-tight sealing mode, and the shell is divided into a heating cavity and a refrigerating cavity which are not communicated with each other; a heating device is arranged in the heating cavity; a condensing device is arranged in the refrigeration cavity; the membrane assembly comprises two metal nets which are arranged at an interval, and a plurality of semiconductor refrigeration sheets are uniformly distributed between the two metal nets; the heating end of each semiconductor refrigeration sheet is arranged corresponding to the heating cavity, and the refrigeration end of each semiconductor refrigeration sheet is arranged corresponding to the refrigeration cavity; and hydrophobic microporous membranes are arranged on one sides, far away from the semiconductor refrigeration sheet, of the two metal nets. Compared with a traditional membrane distillation device, the device is simple in system, and the operation cost is low through the semiconductor refrigerator in the membrane assembly; by switching operation of the positive electrode and the negative electrode, pollution and blockage of the membrane distillation membrane assembly can be effectively relieved.

Description

Technical Field

[0001] This utility model relates to a membrane distillation device based on semiconductor technology. Background Technology

[0002] Membrane distillation is a novel separation technology driven by vapor pressure difference. Compared with traditional distillation methods and other membrane separation technologies, it has advantages such as low operating pressure, low operating temperature, and high separation efficiency, and can make full use of heat sources such as solar energy, waste heat, and residual heat. It is widely used in seawater desalination, ultrapure water preparation, concentration, crystallization, and separation of volatile aqueous solutions.

[0003] In membrane distillation, heat is initially transferred from the warmer feed liquid to the membrane surface on the feed side via thermal convection. Water molecules in the feed liquid absorb heat as they vaporize at the membrane surface, resulting in a lower temperature on the feed side membrane surface compared to the bulk feed liquid. Water vapor molecules then pass through the membrane pores to the permeate side, where they condense and release heat, which is then transferred to the cold side bulk solution via thermal convection. Consequently, the cold side membrane surface temperature is higher than the bulk solution temperature. This temperature difference creates a temperature boundary layer across the membrane, resulting in a temperature distribution between the membrane surface and the bulk feed liquid. This phenomenon, known as temperature polarization, leads to a decrease in the temperature difference across the membrane, significantly reducing the driving force of membrane distillation. Utility Model Content

[0004] To overcome the above-mentioned defects, the purpose of this utility model is to provide a membrane distillation device based on semiconductor technology.

[0005] To achieve the above objectives, this utility model provides a membrane distillation apparatus based on semiconductor technology. The apparatus includes at least a housing, within which a membrane assembly is disposed. The membrane assembly is hermetically sealed to the housing, dividing the housing into a non-communicating heating chamber and a cooling chamber. A heating device is disposed within the heating chamber, and a condensing device is disposed within the cooling chamber.

[0006] The membrane assembly includes: two metal meshes spaced apart, with a plurality of semiconductor cooling plates evenly distributed between the two metal meshes; the heating end of each semiconductor cooling plate is arranged corresponding to a heating cavity, and the cooling end of each semiconductor cooling plate is arranged corresponding to a cooling cavity; a hydrophobic microporous membrane is disposed on the side of the two metal meshes away from the semiconductor cooling plates.

[0007] Furthermore, a drain pipe is provided on the bottom shell between the two metal meshes.

[0008] Furthermore, a vibration device is provided on the side of the housing corresponding to the heating cavity.

[0009] Furthermore, the vibration device is an ultrasonic vibration device.

[0010] Further, the heating device and the condensing device are the hot end and the cold end of a separate type semiconductor refrigerator, respectively.

[0011] To achieve the above object, the utility model discloses membrane distillation membrane module, include: square or circular shell, the both sides of shell are provided with opening, the two metal nets that are spaced apart in the shell are provided with, and the metal net is adapted to the shell, and the uniform distribution of a plurality of semiconductor refrigeration pieces is arranged between the two metal nets, and the heating end of each semiconductor refrigeration piece corresponds to the heating cavity setting, and the refrigeration end of each semiconductor refrigeration piece corresponds to the refrigeration cavity setting, the hydrophobic microporous membrane is arranged on the side of the two metal nets far from semiconductor refrigeration piece, and the hydrophobic microporous membrane and the shell are airtight.

[0012] Further, the drainage port is arranged on the shell between the two metal nets.

[0013] To achieve the above object, the utility model discloses the membrane distillation method based on semiconductor technology, the method includes:

[0014] 1) the hot end of separate type semiconductor refrigerator is placed in the one side cavity of membrane distillation device and forms heating cavity, and the cold end of the separate type semiconductor refrigerator is placed in the other side cavity of membrane distillation device and forms condensing cavity;

[0015] the original liquid is provided to the heating cavity and heated to 60-80 degrees by the hot end of separate type semiconductor refrigerator, and the steam is discharged from the condensing cavity through the membrane module;

[0016] 2) after running a cycle, the positive and negative poles of separate type semiconductor refrigerator are switched, so that the original hot end of the separate type semiconductor refrigerator becomes the cold end, and the original cold end becomes the hot end, i.e. the original heating cavity becomes the condensing cavity, and the original condensing cavity becomes the heating cavity;

[0017] the original liquid is provided to the new heating cavity and heated to 60-80 degrees by the new hot end of separate type semiconductor refrigerator, and the steam is discharged from the new condensing cavity through the membrane module;

[0018] Repeat.

[0019] Compared with the traditional membrane distillation device, the membrane distillation device system based on semiconductor technology realized by the above technical scheme is simple, without secondary pollution, can effectively alleviate temperature polarization, can effectively alleviate the pollution and blockage of the membrane distillation membrane module, has the advantages of green environmental protection and low operation cost, can be used for seawater desalination, preparation of ultrapure water, concentration, crystallization and separation of volatile material aqueous solution and the like, and is a widely used and environment-friendly membrane separation technology. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the schematic diagram of semiconductor refrigerator.

[0021] Figure 2 For a plurality of Figure 1 Semiconductor refrigerator series schematic diagram.

[0022] Figure 3 For Figure 2 The cold end and the hot end of the semiconductor refrigerator shown are separated from each other.

[0023] Figure 4 For the structure schematic diagram of the utility model.

[0024] Figure 5 For Figure 4 The middle film assembly sectional view.

[0025] Figure 6 For Figure 4 The enlarged schematic diagram in the.

[0026] Figure 7 For the film assembly schematic diagram.

[0027] Figure number explanation: shell 1;Film assembly 2;Semiconductor refrigerator 21;Metal mesh 22;Hydrophobic microporous membrane 23;Electrode plate 211;Insulating heat dissipation substrate 212;Separation type semiconductor refrigerator power supply connection end 32;The other end of the separation type semiconductor refrigerator 31;Ultrasonic vibration 4. DETAILED DESCRIPTION

[0028] The embodiments of the utility model will be described in detail below with reference to the drawings.

[0029] In the description of the utility model, it is understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0030] The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can include one or more of the features explicitly or implicitly. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0031] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be directly connected, also can be indirectly connected through intermediate medium, can be two elements inside the communication.For the ordinary skill in the art, the above-mentioned terms can be understood in the specific meaning of the utility model according to specific circumstances.

[0032] The semiconductor refrigerator (TEC) referred to in the utility model is also called thermoelectric refrigerator, which is made of semiconductor material by utilizing Peltier effect.The so-called Peltier effect refers to the phenomenon that one end absorbs heat and the other end releases heat when direct current passes through the electric couple composed of two kinds of semiconductor materials.

[0033] Figure 1 And Figure 2 As shown in the semiconductor refrigerator principle diagram, it includes more than one P-type and N-type pair (group), which are connected together through upper and lower electrode plates 211 and are clamped between two insulating heat dissipation substrates 212.By connecting positive and negative electricity on two electrodes, the hot end and the cold end are formed at the upper and lower ends.Further, the positive and negative poles on the two electrodes are exchanged, and the exchange of the cold end and the hot end at the upper and lower ends can be realized.

[0034] Figure 3 Further deformation is based on Figure 2 , that is, the semiconductor part in Figure 2 is cut in half from the middle, then connected by electrodes, and the upper and lower parts are connected by wires, so as to realize the separation of the cold end (hot end) and the hot end (cold end);One end is the power connection end 32 of the separated semiconductor refrigerator;The other end 31 of the separated semiconductor refrigerator.

[0035] The utility model is realized based on the above principle.As shown in Figure 4 , at least including shell 1, the membrane assembly 2 is arranged in the shell, the membrane assembly is airtight with the shell and is arranged, the shell is divided into the heating cavity and the refrigeration cavity that do not communicate with each other;Heating device is arranged in the heating cavity;Condensing device is arranged in the refrigeration cavity;

[0036] The film assembly 2 comprises two metal nets 22 arranged at intervals, a plurality of semiconductor refrigerators 21 are evenly arranged between the two metal nets, the heating end of each semiconductor refrigerator is arranged corresponding to a heating cavity, and the cooling end of each semiconductor refrigerator is arranged corresponding to a cooling cavity; and a hydrophobic microporous membrane 23 is arranged on the side of the two metal nets away from the semiconductor refrigerators.

[0037] The traditional membrane distillation technology system is complex, and needs to be provided with a system for heating the original liquid and a condensing system, therefore, the heating device and the condensing device in the membrane distillation device are the hot end (cooling end) 31 and the cooling end (hot end) 32 of the separated semiconductor refrigerator.

[0038] Further, a drain pipe is arranged on the bottom shell between the two metal nets.

[0039] Further, an ultrasonic mixer is arranged at the end of the hot end pool, so that the original liquid in the hot end pool is in a completely mixed state through ultrasonic vibration, the temperature of the original liquid is maintained at 60-80 DEG C, energy can be saved, and a large amount of water vapor can be generated on the surface of the hot end membrane.

[0040] The membrane assembly for membrane distillation comprises a mouth-shaped or circular shell, openings are arranged on the two sides of the shell, two metal nets matched with the shell are arranged at intervals in the shell, and a plurality of semiconductor refrigerators are evenly arranged between the two metal nets. Figure 7 The heating end of each semiconductor refrigerator is arranged corresponding to a heating cavity, the cooling end of each semiconductor refrigerator is arranged corresponding to a cooling cavity, a hydrophobic microporous membrane is arranged on the side of the two metal nets away from the semiconductor refrigerators, and the hydrophobic microporous membrane is arranged in air-tight sealing with the shell.

[0041] Further, a drain port is arranged on the shell between the two metal nets.

[0042] The hydrophobic microporous membrane is a key component in the membrane distillation process, and the performance of the hydrophobic microporous membrane determines the membrane distillation efficiency to a great extent.

[0043] The membrane distillation method based on the semiconductor technology comprises the following steps:

[0044] 1) The hot end of the separate semiconductor refrigerator is placed in one side cavity of the membrane distillation device to form a heating cavity, and the cold end of the separate semiconductor refrigerator is placed in the other side cavity of the membrane distillation device to form a condensation cavity;

[0045] The raw liquid is provided to the heating cavity and heated to 60-80 degrees by the hot end of the separate semiconductor refrigerator, and the steam thereof is discharged from the condensation cavity through the membrane assembly;

[0046] 2) After running for a period, the positive and negative poles of the separate semiconductor refrigerator are switched, so that the original hot end of the separate semiconductor refrigerator becomes the cold end, and the original cold end becomes the hot end; that is, the original heating cavity becomes the condensation cavity, and the original condensation cavity becomes the heating cavity;

[0047] The raw liquid is provided to the new heating cavity and heated to 60-80 degrees by the new hot end of the separate semiconductor refrigerator, and the steam thereof is discharged from the new condensation cavity through the membrane assembly;

[0048] The above steps are repeated. The heating cavity and the condensation cavity can be alternately used; when the device is normally operated, the raw liquid enters from the lower end of the hot end pool and exits from the upper end of the cold end pool; when the device is operated for a period of time, the raw liquid enters from the upper end of the cold end pool and exits from the lower end of the hot end pool, so that the steam flows reversely through the membrane assembly, and the membrane assembly can be backwashed.

[0049] The utility model has been described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art without departing from the purpose of the utility model. Many other changes and modifications can be made to the concept and range of the utility model without departing from the concept and range of the utility model, and should be regarded as the protection range of the utility model.

[0050] In the description of the present specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0051] The above is only a specific implementation manner of the utility model, but the protection range of the utility model is not limited to this, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection range of the utility model. Therefore, the protection range of the utility model should be subject to the protection range of the claims.

Claims

1. A membrane distillation device based on semiconductor technology, characterized by: The device comprises a housing, a membrane assembly is arranged in the housing, the membrane assembly is arranged in air-tightness with the housing, and the housing is divided into a heating cavity and a cooling cavity which are not communicated with each other; A heating device is arranged in the heating cavity, and a condensing device is arranged in the cooling cavity; The membrane assembly comprises two metal nets which are arranged in interval, and a plurality of semiconductor refrigeration pieces are arranged in the two metal nets in uniform distribution; The heating end of each semiconductor refrigeration piece corresponds to the heating cavity, the cooling end of each semiconductor refrigeration piece corresponds to the cooling cavity, and a hydrophobic microporous membrane is arranged on the side of the two metal nets which is far from the semiconductor refrigeration piece.

2. The semiconductor technology based membrane distillation device of claim 1, wherein: A drain pipe is arranged on the bottom of the housing between the two metal nets.

3. The semiconductor technology based membrane distillation device of claim 1, wherein: A vibrating device is arranged on the side of the housing corresponding to the heating cavity.

4. The semiconductor technology based membrane distillation device of claim 1, wherein: The heating device and the condensing device are the heating end and the cooling end of a separate semiconductor refrigeration device respectively.

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