A high voltage electric field thin film drying system

Abstract

The invention relates to the technical field of material drying, and discloses a high-voltage electric field thin film drying system, comprising a membrane assembly, a dryer and a vacuum pump; the hot side membrane surface of the membrane assembly is used to pass hot water of a preset temperature, and the cold side membrane surface of the membrane assembly is connected to the dryer and the vacuum pump in sequence through a first pipeline; a high-voltage electric field is arranged in the dryer; the invention cleverly couples the high-voltage electric field drying technology with the membrane distillation technology, and jointly dries the material, which is not only low-cost, but also greatly improves the drying efficiency and drying quality of the material, and is particularly suitable for drying high-value-added materials containing thermally unstable active components.

Description

Technical Field

[0001] The invention relates to the technical field of material drying, in particular to a high-voltage electric field thin film drying system. Background Art

[0002] Material drying involves agricultural production, food processing, pharmaceutical manufacturing, chemical production, papermaking, wood processing and other drying fields. Through drying treatment, not only can materials that meet the moisture content requirements be obtained, but also other properties of the materials can be affected.

[0003] As an electrohydrodynamic drying method, high-voltage electric field drying technology is a high-voltage electric field. The electric field force exerts a pulling effect on the polar water molecules in the material. The energy-carrying ions in the electric field are injected into the material, transferring energy to the water molecules, accelerating the rupture of water molecule clusters, thereby accelerating the evaporation rate of water and improving the dehydration or thawing efficiency of the material. From the perspective of electrohydrodynamics, high-voltage electric field drying technology is mainly based on the "electric pump" effect generated by electroosmosis and the electric field and force inside the dielectric liquid to accelerate the dehydration or thawing of the material. Since the temperature of the dried material does not rise during the drying process, the dried material is dried at a lower temperature. At the same time, since the core part of high-voltage electric field drying is a high-voltage power supply, and the manufacturing cost of high-voltage electrostatic power supply is low, this greatly reduces the cost of the drying system as a whole, and the high-voltage electric field can kill bacteria, molds and other microorganisms in the dried material while drying the material. In addition, since the electric field force generated under high voltage and low current conditions is used during drying, the only by-product is ozone, which also has the characteristics of energy saving and environmental protection. However, the high-voltage electric field drying technology has an obvious disadvantage when used. The drying speed is relatively slow. For some materials containing volatile components, the volatile components will vaporize into the air together with the water during the drying process, affecting the air quality.

[0004] Membrane distillation (MD) is a membrane separation process that uses a hydrophobic microporous membrane with the steam pressure difference on both sides of the membrane as the driving force for mass transfer. When aqueous solutions at different temperatures are separated by a hydrophobic microporous membrane, due to the hydrophobicity of the membrane, the aqueous solutions on both sides cannot pass through the membrane pores of the hydrophobic microporous membrane and enter the other side. Therefore, after the volatile substances are vaporized on the hot side membrane surface, they will pass through the hydrophobic microporous membrane and be output from the cold side membrane surface under the driving force of the steam pressure difference, and then be condensed into liquid to achieve the purpose of material separation, purification or enrichment. Therefore, membrane distillation technology is widely used in the fields of seawater desalination, purification of traditional Chinese medicine, wastewater treatment, etc.

[0005] From the above, it can be seen that although the high-voltage electric field drying technology can achieve the drying of materials at a lower temperature and better ensure the biological activity of the materials, there is a problem of relatively slow drying speed. As for membrane distillation technology, it is currently only used for the separation and purification of materials. In the process of separating and purifying materials, the corresponding impurities are continuously enriched on the hot membrane side of the hydrophobic microporous membrane, so that during use, the hydrophobic microporous membrane needs to be replaced frequently, which is not only cumbersome to operate, but also greatly increases the cost of equipment. Based on this, there is currently no coupling of high-voltage electric field drying technology and membrane distillation technology to significantly improve the drying efficiency and drying quality of materials while reducing equipment costs. Summary of the invention

[0006] The embodiment of the present invention provides a high-voltage electric field thin film drying system for coupling high-voltage electric field drying technology with membrane distillation technology, so as to significantly improve the drying efficiency and drying quality of materials while reducing equipment costs.

[0007] In order to solve the above technical problems, an embodiment of the present invention provides a high-voltage electric field thin film drying system, including a membrane assembly, a dryer and a vacuum pump; the hot side membrane surface of the membrane assembly is used to pass hot water of a preset temperature, and the cold side membrane surface of the membrane assembly is connected to the dryer and the vacuum pump in sequence through a first pipeline; a high-voltage electric field is arranged in the dryer.

[0008] Wherein, an auxiliary heating device is installed on the first pipeline between the membrane assembly and the dryer.

[0009] Wherein, the auxiliary heating device includes a heater; the heater is installed on the first pipeline, the first pipeline on one side of the heater is connected to one end of the parallel pipeline, the other end of the parallel pipeline is connected to the first pipeline on the other side of the heater, and a control valve is installed on the parallel pipeline and / or the first pipeline on at least one side of the heater.

[0010] Wherein, the dryer comprises a disc dryer or a fluidized bed dryer, wherein the steam output end of the fluidized bed dryer is provided with a separator connected to the vacuum pump.

[0011] Wherein, the hot side membrane surface of the membrane assembly is connected with the water storage tank and the water inlet pump in sequence through the second pipeline to form a closed loop.

[0012] It also includes a compressor and a preheater; the steam output end of the dryer is connected to the compressor, the preheater and the water storage tank in sequence through a third pipeline, wherein the preheater is installed on the second pipeline between the water inlet pump and the membrane assembly.

[0013] Among them, it also includes a fourth pipeline and / or a fifth pipeline; the fourth pipeline is used to introduce raw steam, and one end of the fourth pipeline is connected to the third pipeline between the preheater and the compressor; one end of the fifth pipeline is connected to the second pipeline between the water inlet pump and the preheater, and the other end is connected to the third pipeline between the preheater and the fourth pipeline.

[0014] Wherein, it also includes a cooler; the cooler is installed on the second pipeline between the preheater and the membrane assembly, and the cooler is used to be connected to the cooling water unit through the sixth pipeline to form a closed loop.

[0015] Wherein, the high-voltage electric field includes an anode and a cathode arranged relatively at an interval; the distance between the anode and the cathode is adjustable, the anode is connected to a DC high-voltage power supply, and the cathode is grounded.

[0016] Wherein, the dryer is also equipped with a temperature sensor, a humidity sensor and a gas pressure sensor, the temperature sensor, the humidity sensor and the gas pressure sensor are respectively connected to a control module for communication, and the control module is connected to a display module for communication.

[0017] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0018] The high-voltage electric field thin film drying system provided by the embodiment of the present invention can constitute a vacuum membrane distillation system known in the art through a membrane assembly and a vacuum pump, and can use a high-voltage electric field drying technology known in the art to dry the material through a high-voltage electric field set in the dryer. Therefore, when the drying process of the material is started, hot water vaporizes on the hot side membrane surface of the membrane assembly, and under the impetus of the steam pressure difference generated by the vacuum pump, the cold side membrane surface of the membrane assembly outputs superheated steam, and the superheated steam cooperates with the high-voltage electric field to dry the material in the dryer. Therefore, the present invention cleverly couples the high-voltage electric field drying technology and the membrane distillation technology, and jointly dries the material. Because the vacuum pump continuously evacuates the gas inside the system to maintain a relatively stable vacuum degree, the vacuum drying of the material is also taken into account. In the process of drying, the mold assembly no longer contacts the material to purify or concentrate it, thereby ensuring the service life of the membrane assembly, avoiding the time-consuming and labor-intensive problem of frequently replacing its hydrophobic microporous membrane, and reducing the production cost.

[0019] At the same time, the high-voltage electric field thin film drying system provided by the embodiment of the present invention has a fast drying rate. Since the heat transfer characteristics of superheated steam are better than those of air at the same temperature, and the diffusion of water vapor generated by evaporation of the membrane module has almost no interfacial resistance for mass transfer between different molecules, the drying rate of the material in the dryer depends only on the heat transfer rate of the superheated steam, and its drying cycle is greatly shortened, which significantly improves the disadvantage of the slow material drying rate existing in the existing high-voltage electric field drying technology.

[0020] In addition, the high-voltage electric field thin film drying system provided by the embodiment of the present invention has good drying quality. Since the surface of the material is moist and the drying stress is small when the material is dried with superheated steam, it is not easy to produce drying defects such as cracking and deformation; since the superheated steam has no oxidation reaction in the process of drying the material, the color of the material is not easy to produce enzymatic browning; at the same time, the material can be dried at low temperature and high superheat, with less Maillard reaction browning, and less deterioration of highly heat-sensitive and highly active substances, thereby ensuring better drying quality of the material. In this process, since high-voltage electric field drying acts on water molecules in the material through electric field force and ions, there is no heat transfer in this process, which does not affect the temperature regulation of the membrane component when drying the material through superheated steam, and can also kill bacteria, molds and other microorganisms present in the dried material. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a high-voltage electric field thin film drying system shown in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the arrangement structure of the high voltage electric field in the dryer according to an embodiment of the present invention.

[0024] In the figure: 1. membrane assembly; 2. dryer; 3. vacuum pump; 4. first pipeline; 5. high-voltage electric field; 51. anode; 52. cathode; 53. DC high-voltage generator; 6. heater; 7. parallel pipeline; 8. second pipeline; 9. water storage tank; 10. water inlet pump; 11. compressor; 12. preheater; 13. third pipeline; 14. fourth pipeline; 15. fifth pipeline; 16. cooler; 17. sixth pipeline; 18. material tray. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] See also Figure 1 The present embodiment provides a high-voltage electric field thin film drying system, comprising a membrane assembly 1, a dryer 2 and a vacuum pump 3; the hot side membrane surface of the membrane assembly 1 is used to pass hot water of a preset temperature, and the cold side membrane surface of the membrane assembly 1 is connected to the dryer 2 and the vacuum pump 3 in sequence through a first pipeline 4; a high-voltage electric field 5 is arranged in the dryer 2.

[0028] Specifically, the high-voltage electric field thin film drying system shown in this embodiment can constitute a vacuum membrane distillation system known in the art through the membrane assembly 1 and the vacuum pump 3, and can use the high-voltage electric field drying technology known in the art to dry the material through the high-voltage electric field 5 set in the dryer 2. Therefore, when the drying operation of the material is started, the hot water vaporizes on the hot side membrane surface of the membrane assembly 1, and under the impetus of the steam pressure difference generated by the vacuum pump 3, the cold side membrane surface of the membrane assembly 1 outputs superheated steam, and the superheated steam cooperates with the high-voltage electric field 5 to dry the material in the dryer 2. Therefore, the present invention cleverly couples the high-voltage electric field drying technology with the membrane distillation technology, and jointly dries the material. Because the vacuum pump 3 continuously evacuates the gas inside the system to maintain a relatively stable vacuum degree, the vacuum drying of the material is also taken into account, and the drying rate and drying quality of the material are improved. During the drying process, the module assembly no longer contacts the material to purify or concentrate it, thereby ensuring the service life of the membrane assembly, avoiding the time-consuming and labor-intensive problem of frequent replacement of its hydrophobic microporous membrane, and reducing production costs.

[0029] It should be pointed out here that since the system shown in this embodiment uses superheated steam combined with a high-voltage electric field 5 to dry the material, hot water of a preset temperature is introduced into the hot side membrane surface of the membrane component 1, which facilitates the vaporization of the hot water into water vapor on the hot side membrane surface of the membrane component 1. Under the impetus of the steam pressure difference, superheated steam is output on the cold side membrane surface by utilizing the characteristics of the hydrophobic microporous membrane of the membrane component 1, wherein the preheating temperature can be 70-100°C, which is not specifically limited here, as long as the corresponding temperature that facilitates the vaporization of hot water meets the design requirements.

[0030] At the same time, when the superheated steam is used to dry the material, the material is not prone to drying defects such as cracking and deformation, and the color of the material is not prone to enzymatic browning. The material can be dried at low temperature and high superheat, with less Maillard reaction browning, less deterioration of highly heat-sensitive and highly active substances, and when the material is dried in combination with the high-voltage electric field drying technology, since there is no heat transfer during the drying process of the material by the high-voltage electric field 5, the drying temperature of the material can be better controlled and the drying quality of the material can be ensured. Therefore, the present invention is particularly suitable for drying high-value-added materials containing thermally unstable active components.

[0031] The dryer 2 may include a disk dryer or a fluidized bed dryer known in the art, and a separator connected to the vacuum pump 3 is provided at the steam output end of the fluidized bed dryer. Thus, large particles or blocks of non-volatile materials can be quickly dried by the disk dryer, while volatile small particles can be dried by the fluidized bed dryer, and gaseous materials volatilized with superheated steam can be separated and recovered by the separator, and volatile components in the materials can also be separated and recovered by the separator.

[0032] Preferably, in this embodiment, an auxiliary heating device is installed on the first pipeline 4 between the membrane assembly 1 and the dryer 2.

[0033] Specifically, the auxiliary heating device can be an electric heater or a heat exchanger known in the art. The auxiliary heating device can be used to auxiliary heat the superheated steam output by the membrane assembly 1, so as to effectively control the temperature of the superheated steam delivered to the dryer 2 through the first pipeline 4, and realize the drying process of the material in the dryer 2 at a preset temperature.

[0034] Preferably, if Figure 1 As shown, the auxiliary heating device in this embodiment includes a heater 6; the heater 6 is installed on the first pipeline 4, the first pipeline 4 on one side of the heater 6 is connected to one end of the parallel pipeline 7, and the other end of the parallel pipeline 7 is connected to the first pipeline 4 on the other side of the heater 6, and a control valve is installed on the parallel pipeline 7 and / or on at least one side of the heater 6.

[0035] Specifically, in actual design, temperature acquisition elements (temperature sensors) can be installed on the first pipelines 4 corresponding to the output side of the membrane assembly 1 and the input side of the dryer 2, and control valves can be installed on the first pipelines 4 corresponding to both sides of the heater 6 and on the parallel pipeline 7. The control valve is preferably a solenoid valve known in the art, and the heater 6 is preferably an electric heater known in the art. Thus, when it is detected that the temperature of the superheated steam output by the membrane assembly 1 reaches the preset temperature for heating the material, that is, when the superheat degree of the superheated steam required for the operation of the dryer 2 is reached, the control valve on the parallel pipeline 7 can be controlled by the PLC controller known in the art to open, and the superheated steam is directly transported to the dryer 2, while the heater 6 and the control valves on the first pipelines 4 corresponding to both ends are not started; only when it is detected that the temperature of the superheated steam on the input side of the dryer 2 does not reach the preset temperature, the heater 6 and the control valves on the first pipelines 4 corresponding to both ends will be started to perform auxiliary heating on the superheated steam.

[0036] Preferably, the hot side membrane surface of the membrane assembly 1 in this embodiment is connected with the water storage tank 9 and the water inlet pump 10 in sequence through the second pipeline 8 to form a closed loop.

[0037] Specifically, Figure 1 As shown, the hot side membrane surface of the membrane assembly 1 forms a hot water circulation system with the water storage tank 9 and the water inlet pump 10 in sequence through the second pipeline 8, wherein a filter and a one-way valve are installed on the corresponding second pipeline 8 of the hot water circulation system. When the hot water circulation system drives the hot water to circulate through the hot side membrane surface of the membrane assembly 1 at a preset flow rate, it will vaporize on the hot side membrane surface, and under the driving force of the steam pressure difference, it will pass through the hydrophobic microporous membrane of the membrane assembly 1 and output from the cold side membrane surface, thereby prompting the membrane assembly 1 to output superheated steam to implement drying treatment on the material.

[0038] Preferably, the present embodiment also includes a compressor 11 and a preheater 12; the steam output end of the dryer 2 is connected to the compressor 11, the preheater 12 and the water storage tank 9 in sequence through the third pipeline 13, wherein the preheater 12 is installed on the second pipeline 8 between the water inlet pump 10 and the membrane assembly 1.

[0039] Specifically, Figure 1As shown, after the superheated steam is combined with the high-voltage electric field 5 in the dryer 2 to dry the material, the steam output from the dryer 2 can also be used as a heat source for preheating the water inlet of the membrane module 1 after being compressed by the compressor 11 to increase the enthalpy, that is, the water inlet pipeline (second pipeline 8) on the corresponding side of the hot side membrane surface of the membrane module 1 is heat exchanged by the preheater 12 to ensure the temperature of the hot water entering the hot side membrane surface of the membrane module 1, and the high-temperature steam condenses into liquid condensed water after the heat exchange of the preheater 12. The condensed water is transported to the water storage tank 9 along the third pipeline 13, thereby entering the hot water circulation system, and participating in the generation of superheated steam of the membrane module 1 and the subsequent heating treatment of the material by superheated steam, thereby forming a closed circulation system. In the entire process, the latent heat of steam is fully utilized, the thermal efficiency is high, the energy-saving effect is significant, and the thermal efficiency can be as high as 90%.

[0040] At the same time, when the superheated steam is combined with the high-voltage electric field 5 in the dryer 2 to dry the material, only a small amount of ozone is produced as a byproduct of the drying by the high-voltage electric field 5, thereby being clean and environmentally friendly.

[0041] Preferably, the present embodiment further includes a fourth pipeline 14 and / or a fifth pipeline 15; the fourth pipeline 14 is used to introduce raw steam, and one end of the fourth pipeline 14 is connected to the third pipeline 13 between the preheater 12 and the compressor 11; one end of the fifth pipeline 15 is connected to the second pipeline 8 between the water inlet pump 10 and the preheater 12, and the other end is connected to the third pipeline 13 between the preheater 12 and the fourth pipeline 14.

[0042] Specifically, raw steam generally refers to steam output from a boiler, and the temperature of raw steam is as high as 300°C and has a relatively high pressure. Therefore, when raw steam is introduced into the third pipeline 13 through the fourth pipeline 14, the inlet water introduced into the membrane module 1 can also be preheated by the preheater 12 to achieve effective utilization of high-quality energy. In actual use, a control valve can be provided on the fourth pipeline 14 to control the input of raw steam to the fourth pipeline 14 according to the temperature of the water inlet side of the membrane module 1.

[0043] At the same time, the hot water with a relatively low temperature circulating in the hot water circulation system shown in the above embodiment can also be introduced into the third pipeline 13 through the fifth pipeline 15 to regulate the temperature and air pressure of the steam flowing in the third pipeline 13, wherein a control valve and a flow meter can be installed on the fifth pipeline 15, and the control valve includes a one-way valve and / or a solenoid valve.

[0044] Furthermore, the present embodiment also includes a cooler 16 ; the cooler 16 is installed on the second pipeline 8 between the preheater 12 and the membrane assembly 1 , and the cooler 16 is used to be connected to the cooling water unit through the sixth pipeline 17 to form a closed loop.

[0045] Specifically, the cooler 16 and the cooling water unit can also form a cooling water circulation system through the sixth pipeline 17, and the heat exchange function of the cooler 16 can be used to process the hot water entering the membrane component 1 to ensure that the temperature of the hot water entering the hot side membrane surface of the membrane component 1 is stably maintained within a preset range, thereby achieving effective utilization of low-grade energy.

[0046] Preferably, if Figure 2 As shown, in this embodiment, the high-voltage electric field 5 includes an anode 51 and a cathode 52 that are relatively spaced apart; the distance between the anode 51 and the cathode 52 is adjustable, the anode 51 is connected to a DC high-voltage power supply, and the cathode 52 is grounded.

[0047] Specifically, in Figure 2 The dryer 2 specifically illustrated in the figure is a disc dryer, in which an anode 51 and a cathode 52 are arranged on the left and right sides of a material tray 18 in the disc dryer, wherein the anode 51 and the cathode 52 can both be made of copper plates. Of course, the anode 51 and the cathode 52 can also be arranged into an upper and lower relative arrangement structure according to the specific form of the dryer 2.

[0048] At the same time, an adjustable mechanism arranged along the electric field direction of the high-voltage electric field 5 can be provided in the dryer 2, for example: the adjustable structure includes a guide rod and a guide sleeve, at least two guide sleeves are sleeved on the guide rod, and one guide sleeve is connected to the anode 51 and the cathode 52 respectively. The adjustable structure can be used to adjust the distance between the anode 51 and the cathode 52 to adapt to materials or material trays 18 of different sizes, and to implement high-pressure drying operations on the materials.

[0049] In addition, the DC high-voltage power supply includes a DC high-voltage generator 53 known in the art, and the anode 51 is connected to the mains via the DC high-voltage generator 53 , so that the voltage between the anode 51 and the cathode 52 can be continuously adjusted via the DC high-voltage generator 53 .

[0050] Preferably, in this embodiment, a temperature sensor, a humidity sensor and a gas pressure sensor are also installed in the dryer 2, and the temperature sensor, the humidity sensor and the gas pressure sensor are respectively communicatively connected to the control module, and the control module is communicatively connected to the display module.

[0051] Specifically, the temperature sensor, humidity sensor and gas pressure sensor are all sensing detection devices known in the art, the control module can be a single chip microcomputer or a PLC controller known in the art, and the display module can be an LCD display known in the art. Figure 1 Indicated in.

[0052] In actual work, the temperature sensor and humidity sensor are respectively used to collect the temperature information and humidity information in the dryer 2, and the gas pressure sensor is used to collect the vacuum degree (air pressure) information in the dryer 2. The temperature sensor, humidity sensor and gas pressure sensor respectively feed back the collected information to the control module, and the control module performs analog-to-digital conversion on the received information and transmits it to the display module, thereby realizing real-time monitoring of the temperature, humidity and vacuum degree in the dryer 2 and feeding back relevant information to the operator.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high voltage electric field thin film drying system, characterized in that: Includes membrane module, dryer and vacuum pump; The hot side membrane surface of the membrane assembly is used to pass hot water of a preset temperature, and the cold side membrane surface of the membrane assembly is connected to the dryer and the vacuum pump in sequence through a first pipeline; A high voltage electric field is provided in the dryer; The dryer includes a disc dryer or a fluidized bed dryer, wherein the steam output end of the fluidized bed dryer is provided with a separator connected to the vacuum pump; the hot side membrane surface of the membrane module is connected to the water storage tank and the water inlet pump in a closed loop in sequence through the second pipeline; It also includes a compressor and a preheater; the steam output end of the dryer is connected to the compressor, the preheater and the water storage tank in sequence through a third pipeline, wherein the preheater is installed on the second pipeline between the water inlet pump and the membrane assembly; The high-voltage electric field includes an anode and a cathode that are relatively spaced apart; the distance between the anode and the cathode is adjustable, the anode is connected to a DC high-voltage power supply, and the cathode is grounded.

2. The high voltage electric field thin film drying system according to claim 1, characterized in that: An auxiliary heating device is installed on the first pipeline between the membrane assembly and the dryer.

3. The high voltage electric field thin film drying system according to claim 2, characterized in that: The auxiliary heating device comprises a heater; The heater is installed on the first pipeline, the first pipeline on one side of the heater is connected to one end of the parallel pipeline, and the other end of the parallel pipeline is connected to the first pipeline on the other side of the heater. A control valve is installed on the parallel pipeline and / or the first pipeline on at least one side of the heater.

4. The high voltage electric field thin film drying system according to claim 1, characterized in that: Also including a fourth pipeline and / or a fifth pipeline; The fourth pipeline is used to introduce raw steam, and one end of the fourth pipeline is connected to the third pipeline between the preheater and the compressor; One end of the fifth pipeline is connected to the second pipeline between the water inlet pump and the preheater, and the other end is connected to the third pipeline between the preheater and the fourth pipeline.

5. The high voltage electric field thin film drying system according to claim 1, characterized in that: Also includes a cooler; The cooler is installed on the second pipeline between the preheater and the membrane assembly, and the cooler is used to be connected to the cooling water unit through the sixth pipeline to form a closed loop.

6. The high voltage electric field thin film drying system according to claim 1, characterized in that: The dryer is also equipped with a temperature sensor, a humidity sensor and a gas pressure sensor. The temperature sensor, the humidity sensor and the gas pressure sensor are respectively connected to a control module for communication, and the control module is connected to a display module for communication.

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