Low-temperature distilled water preparation device based on wet thermoacoustic effect

Abstract

The present invention relates to the field of cryogenic distillation technology, and provides a low-temperature distilled water preparation device based on the wet thermoacoustic effect. The device comprises a device body, at least one sound source, a thermoacoustic plate stack, a drainage device, and a cooling device. The device body comprises a resonance tube, a raw material tank containing a raw material liquid, and a collection tank for collecting distilled water, the raw material tank and the collection tank being connected to the resonance tube. The sound source is disposed within the resonance tube. The first portion of the thermoacoustic plate stack is located within the raw material tank and immersed in the raw material liquid, and the second portion of the thermoacoustic plate stack is located within the resonance tube. The thermoacoustic plate stack is made of a water-absorbing material. The drainage device is used to promote air flow from the resonance tube inlet to the resonance tube outlet. The cooling device is located downstream of the thermoacoustic plate stack and above the collection tank. Using the wet thermoacoustic effect technology, the device achieves high-speed, efficient, and safe distillation of seawater or sewage driven by sound waves.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature distillation, and in particular to a low-temperature distilled water preparation device based on wet thermoacoustic effect. Background Art

[0002] Water shortages pose a significant challenge to my country's rapid economic development. To address this challenge, distillation has been widely used to purify or desalinate water resources, such as sewage and seawater. However, current technologies often require high temperatures or vacuum to rapidly evaporate liquid water, which poses challenges such as high energy consumption and high costs. Summary of the Invention

[0003] The present invention provides a low-temperature distilled water preparation device based on the wet thermoacoustic effect, which is used to solve the defects of high energy consumption and high cost in the existing technology of using high temperature or vacuum to achieve high-speed evaporation of liquid water, and realizes high-speed, efficient and safe distillation of seawater or sewage under the drive of sound waves.

[0004] The present invention provides a low-temperature distilled water preparation device based on wet thermoacoustic effect, comprising:

[0005] The main body of the device includes a resonance tube, a raw material tank containing raw material liquid and a collection tank for collecting distilled water, wherein the raw material tank and the collection tank are connected to the resonance tube;

[0006] at least one sound source disposed in the resonance tube;

[0007] A thermoacoustic plate stack, wherein a first portion of the thermoacoustic plate stack is located in the raw material tank and immersed in the raw material liquid, a second portion of the thermoacoustic plate stack is located in the resonance tube, and the thermoacoustic plate stack is made of a water-absorbing material;

[0008] A flow guide device, used to promote the flow of air from the resonance tube inlet toward the resonance tube outlet;

[0009] A cooling device is provided downstream of the thermoacoustic plate stack and is located above the collecting tank.

[0010] According to a low-temperature distilled water preparation device based on wet thermoacoustic effect provided by the present invention, the drainage device is a fan, and the blowing direction of the fan is consistent with the direction from the inlet of the resonance tube to the outlet of the resonance tube.

[0011] According to the low-temperature distilled water preparation device based on the wet thermoacoustic effect provided by the present invention, the first part of the thermoacoustic plate stack is connected to the tube wall of the resonance tube.

[0012] According to the present invention, a low-temperature distilled water preparation device based on wet thermoacoustic effect further includes a preheater arranged in the resonance tube, and the preheater is located between the sound source and the thermoacoustic plate stack.

[0013] According to the low-temperature distilled water preparation device based on the wet thermoacoustic effect provided by the present invention, an air filter is provided at the inlet of the resonance tube.

[0014] According to a low-temperature distilled water preparation device based on wet thermoacoustic effect provided by the present invention, the thermoacoustic plate stack is a parallel flow channel structure or a stacked wire mesh structure.

[0015] According to the present invention, a low-temperature distilled water preparation device based on wet thermoacoustic effect is provided, wherein the thermoacoustic plate stack is a porous medium.

[0016] According to the present invention, a low-temperature distilled water preparation device based on wet thermoacoustic effect is provided, wherein the cooling device is a plate cooler, a shell and tube cooler, or a column and plate cooler.

[0017] According to a low-temperature distilled water preparation device based on wet thermoacoustic effect provided by the present invention, the material of the thermoacoustic plate stack is one or more of cellulose, zeolite, cotton, and linen.

[0018] According to a low-temperature distilled water preparation device based on wet thermoacoustic effect provided by the present invention, the flow direction of the cooling fluid in the cooling device is vertical.

[0019] The present invention provides a low-temperature distilled water preparation device based on the wet thermoacoustic effect. When the sound source is in operation, a stable standing wave sound field is established in the resonance tube. In the sound field, air and the surface of the thermoacoustic plate stack exchange heat, thereby realizing thermoacoustic heat pumping by consuming sound energy, causing a wet thermoacoustic conversion process to occur in the microchannel of the thermoacoustic plate stack. Under the action of the thermoacoustic heat pumping, heat is pumped from the air inlet side of the thermoacoustic plate stack to the air outlet side of the thermoacoustic plate stack, so that a temperature gradient is established in the thermoacoustic plate stack along the air flow direction, accelerating the evaporation of water. A drainage device is used to make a steady flow in the device body (resonance tube) in the direction from the resonance tube inlet to the resonance tube outlet. The steady flow is used to achieve the thermal balance of the pumping heat process, and the moist air formed at the thermoacoustic plate stack is output to the cooling device in time, so that the water vapor is condensed into distilled water. The present low-temperature distilled water preparation device only uses two moving parts, the sound source and the drainage device, and does not require vacuum equipment. It has a simple structure, low cost and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or 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 any creative work.

[0021] Figure 1 It is a structural schematic diagram of a low-temperature distilled water preparation device based on wet thermoacoustic effect provided by the present invention.

[0022] Reference numerals:

[0023] 1: Air filter; 2: Resonance tube; 3: Sound source; 4: Thermoacoustic plate stack;

[0024] 5: Cooling device; 6: Fan; 7: Raw material tank; 8: Collection tank. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] The following combination Figure 1 The invention describes a low-temperature distilled water preparation device based on the wet thermoacoustic effect.

[0027] like Figure 1 As shown, the present invention provides a low-temperature distilled water preparation device based on the wet thermoacoustic effect, which includes an equipment body, at least one sound source 3, a thermoacoustic plate stack 4, a drainage device and a cooling device 5.

[0028] The main body of the device includes a resonance tube 2, a raw material tank 7, and a collection tank 8. The raw material tank 7 contains a raw material liquid, and the collection tank 8 is used to collect distilled water. Both the raw material tank 7 and the collection tank 8 are connected to the resonance tube 2. Here, the raw material liquid can be seawater, sewage, or other liquid containing water.

[0029] In addition, the sound source 3 is disposed within the resonance tube 2. The second portion of the thermoacoustic plate stack 4 can be located within the resonance tube 2. When the sound source 3 is in operation, a stable standing wave acoustic field is established within the resonance tube 2. In this acoustic field, the sound waves cause the air in the microchannels of the thermoacoustic plate stack 4 to compress and expand as a working medium, forming oscillations. The oscillating air exchanges heat with the surface of the thermoacoustic plate stack 4, thereby achieving thermoacoustic heat pumping by consuming acoustic energy.

[0030] It should be noted that when the thermoacoustic plate stack 4 is arranged as a whole at a position in the middle of the resonance tube 2 that is biased towards the inlet of the resonance tube 2, the temperature of the end of the thermoacoustic plate stack 4 away from the inlet is higher than the temperature of the end of the thermoacoustic plate stack 4 close to the inlet; when the thermoacoustic plate stack 4 is arranged as a whole at a position in the middle of the resonance tube 2 that is biased towards the outlet of the resonance tube 2, the temperature of the end of the thermoacoustic plate stack 4 away from the outlet is higher than the temperature of the end of the thermoacoustic plate stack 4 close to the outlet.

[0031] In this embodiment, the inlet of the resonance tube 2 is located on the left side of the resonance tube 2, and the outlet of the resonance tube 2 is located on the right side of the resonance tube 2. The entire arrangement of the thermoacoustic plate stack 4 in the middle of the resonance tube 2, closer to the inlet of the resonance tube 2, is equivalent to the entire arrangement of the thermoacoustic plate stack 4 in the left half of the resonance tube 2; the entire arrangement of the thermoacoustic plate stack 4 in the middle of the resonance tube 2, closer to the outlet of the resonance tube 2, is equivalent to the arrangement of the thermoacoustic plate stack 4 in the right half of the resonance tube 2.

[0032] In addition, the first part of the thermoacoustic plate stack 4 can be located in the raw material tank 7, and the first part of the thermoacoustic plate stack 4 is immersed in the raw material liquid. The material of the thermoacoustic plate stack 4 can be a water-absorbing material, so that a wet thermoacoustic conversion process occurs in the microchannel of the thermoacoustic plate stack 4, that is, a thermoacoustic pump heat process enhanced by gas-liquid phase change.

[0033] In this embodiment, the moisture in the thermoacoustic plate stack 4 evaporates at the high-temperature end of the thermoacoustic plate stack 4. If the thermoacoustic plate stack 4 is set as a whole in the left half of the resonance tube 2, the air can drive the water vapor generated at the right end of the thermoacoustic plate stack 4 to flow directly to the outlet during the circulation process, which is conducive to improving the distillation effect; if the thermoacoustic plate stack 4 is set as a whole in the right half of the resonance tube 2, the moisture in the thermoacoustic plate stack 4 will evaporate at the left end of the thermoacoustic plate stack 4. During the circulation process, the air drives the water vapor to pass through the thermoacoustic plate stack 4 before it can flow to the outlet. In this process, part of the water vapor will condense at the right end (low-temperature end) of the thermoacoustic plate stack 4, and part will flow to the outlet with the air, so the distillation effect is relatively small. Therefore, in order to improve the performance of the system, it is preferred to set the thermoacoustic plate stack 4 in the left half of the resonance tube 2, and make the right end of the thermoacoustic plate stack 4 close to the midpoint of the resonance tube 2.

[0034] Under the action of the thermoacoustic pump, heat is pumped from the air inlet side (left end) of the thermoacoustic plate stack 4 to the air outlet side (right end) of the thermoacoustic plate stack 4, establishing a temperature gradient along the air flow direction within the thermoacoustic plate stack 4. Specifically, the temperature at the air outlet side of the thermoacoustic plate stack 4 is higher than the temperature at the air inlet side of the thermoacoustic plate stack 4. This temperature increase helps accelerate water evaporation. Here, the temperature at the air inlet side of the thermoacoustic plate stack 4 is at or below room temperature.

[0035] It's important to emphasize that the wet thermoacoustic effect itself causes the water on the surface of the thermoacoustic plate stack 4 to periodically evaporate and condense, generating a time-averaged, moist air flow within the microchannels of the thermoacoustic plate stack 4, which facilitates water evaporation. Wet thermoacoustic conversion incorporates a periodic evaporation and condensation process, stimulated by pressure and temperature oscillations, into traditional thermoacoustic conversion. This process enhances thermoacoustic conversion by leveraging the dramatic density and volume changes, as well as the release and absorption of latent heat, produced by the working fluid. Compared to traditional thermoacoustic pumping, wet thermoacoustic pumping can generate a greater amount of pumped heat within a given temperature range.

[0036] In addition, the drainage device is used to promote the flow of air from the inlet of the resonance tube 2 toward the outlet of the resonance tube 2. In this way, due to the drainage effect of the drainage device, the air in the resonance tube 2 will have a stable steady flow. The steady flow plays a role in heat exchange and serves as the heat load (heat source) of the cold end of the thermoacoustic plate stack 4. Moreover, due to the drainage effect of the drainage device, the humid air (the water vapor and high-temperature air formed) formed at the hot end of the thermoacoustic plate stack 4 is discharged.

[0037] In this embodiment, the cooling device 5 is positioned downstream of the thermoacoustic plate stack 4, that is, on the air outlet side of the thermoacoustic plate stack 4. This allows the humid air generated by the thermoacoustic plate stack 4 to pass through the cooling device 5, condensing the water vapor into distilled water. Furthermore, the cooling device 5 is positioned above the collection tank 8, allowing the condensed distilled water to fall into the collection tank 8 under the action of gravity, thereby enabling the collection of the distilled water.

[0038] In this embodiment, the sound source 3 can serve as a driving source to provide sound energy for the occurrence of the thermal effect of the thermoacoustic pump of the entire device. Specifically, the sound source 3 can be a speaker, or it can be any component that can generate oscillations, such as a vibrating piston or a vibrating membrane.

[0039] With this arrangement, the low-temperature distilled water preparation device employs wet thermoacoustic pumping technology, utilizing the phase change of water to improve the efficiency of thermoacoustic pumping. The pumping heat effect is then used to increase the temperature at the outlet of the thermoacoustic plate stack 4, thereby accelerating water evaporation. A drainage device is used to create a steady flow within the device body (resonance tube 2) from the inlet to the outlet of the resonance tube 2. This steady flow is used to achieve thermal equilibrium during the pumping process, and the moist air formed at the thermoacoustic plate stack 4 is promptly output to the cooling device 5, condensing the water vapor into distilled water. This low-temperature distilled water preparation device utilizes only two moving parts, the sound source 3 and the drainage device, and does not require vacuum equipment. It has a simple structure, low cost, and high reliability.

[0040] In an optional embodiment of the present invention, the air guide device can be a fan 6, and the blowing direction of the fan 6 is consistent with the direction from the inlet to the outlet of the resonance tube 2. In this way, dry air can be introduced into the resonance tube 2, and a steady flow is generated in the resonance tube 2 from the cold end of the thermoacoustic plate stack 4 to the hot end of the thermoacoustic plate stack 4. This steady flow can not only remove the heat load and cooling load generated by the thermal effect of the thermoacoustic pump, achieving thermal balance, but also allow the moist air to pass through the cooling device 5, condensing water vapor into distilled water, thereby achieving a continuous output of distilled water.

[0041] In an optional embodiment, the fan 6 may be provided downstream of the cooling device 5 to ensure that the water vapor can pass through the cooling device 5, thereby improving the condensation effect.

[0042] In other embodiments, the fan 6 can be arranged inside the resonance tube 2, the fan 6 can also be arranged at the inlet of the resonance tube 2, or the fan 6 can be arranged between the thermoacoustic plate stack 4 and the cooling device 5. The specific position of the fan 6 is not limited here, and the fan 6 only needs to promote the flow of air from the inlet of the resonance tube 2 toward the outlet of the resonance tube 2.

[0043] In an optional embodiment of the present invention, the first part of the thermoacoustic plate stack 4 is connected to the tube wall of the resonance tube 2, so that the thermoacoustic plate stack 4 is fixed in the resonance tube 2, preventing the thermoacoustic plate stack 4 from being displaced by the drainage action of the drainage device.

[0044] In an optional embodiment of the present invention, the low-temperature distilled water preparation device also includes a preheater, which is arranged in the resonance tube 2, and the preheater can be located between the sound source 3 and the thermoacoustic plate stack 4 to increase the temperature of the air, thereby increasing the pump heat temperature of the thermoacoustic plate stack 4, which is beneficial to improving the evaporation efficiency of water.

[0045] In an optional embodiment of the present invention, an air filter 1 is provided at the inlet of the resonance tube 2 to filter the air entering the resonance tube 2 , thereby preventing foreign matter such as dust from entering the resonance tube 2 .

[0046] In this embodiment, the inlet of the resonance tube 2 can be set at the end of the resonance tube 2, or the inlet of the resonance tube 2 can be set at the side of the resonance tube 2; and the inlet of the resonance tube 2 can be set upstream of the thermoacoustic plate stack 4, so that the air entering the resonance tube 2 from the inlet can pass through the thermoacoustic plate stack 4; the shape of the inlet of the resonance tube 2 can be set according to actual needs.

[0047] It should be noted that the position and shape of the inlet of the resonance tube 2 are not specifically limited here, as long as the outside air can enter the resonance tube 2 through the inlet of the resonance tube 2.

[0048] In an optional embodiment, the thermoacoustic plate stack 4 may be a porous medium, so that microchannels for air to pass through exist in the thermoacoustic plate stack 4 and water evaporation occurs on the surface of the microchannels.

[0049] Specifically, the thermoacoustic plate stack 4 may be a parallel flow channel structure, or a stacked wire mesh structure.

[0050] In this embodiment, the material of the thermoacoustic plate stack 4 can be one or more of cellulose, zeolite, cotton, linen, etc.

[0051] In an optional embodiment of the present invention, the cooling device 5 can be a plate cooler, a shell and tube cooler, a column plate cooler, or other forms of coolers. The structure of the cooling device 5 is not specifically limited here, and it only needs to be able to play a cooling role.

[0052] In an optional embodiment, the flow direction of the cooling fluid in the cooling device 5 can be vertical, so that the distilled water condensed on the wall of the cooling device 5 can flow into the collection tank 8 under the action of gravity.

[0053] Here, the cooling fluid may be water, air, or other fluids.

[0054] It should be noted that the upstream and downstream mentioned above are determined according to the flow direction of air.

[0055] The present invention provides a low-temperature distilled water preparation device based on wet thermoacoustic effect, comprising a The system comprises a resonance tube 2, a raw material tank 7, and a collection tank 8. The inlet of the resonance tube 2 is located at the leftmost end of the resonance tube 2 (i.e., the inlet of the resonance tube 2 is located at the end of the horizontal portion of the resonance tube 2 away from the vertical portion). The inlet of the resonance tube 2 serves as an air inlet, and an air filter 1 is provided at the inlet of the resonance tube 2 to prevent dust from entering the resonance tube 2. A sound source 3 is provided within the resonance tube 2 and near the inlet of the resonance tube 2. The sound source 3 serves as a driving source for driving the entire system to generate a thermoacoustic pumping effect. The raw material tank 7 is located below the horizontal portion of the resonance tube 2 and is connected to the horizontal portion of the resonance tube 2 to form an integrated structure. The first portion of the thermoacoustic plate stack 4 is located within the raw material tank 7, and the second portion of the thermoacoustic plate stack 4 is located within the horizontal portion of the resonance tube 2. The structure of the thermoacoustic plate stack 4 can be a parallel flow channel type or a stacked wire mesh type, and the material of the thermoacoustic plate stack 4 can be a highly absorbent material such as cellulose, zeolite, cotton, or linen. The first portion of the thermoacoustic plate stack 4 is immersed in seawater or sewage in the raw material tank 7. Due to the capillary effect, the microchannels within the thermoacoustic plate stack 4 remain moist. The collection tank 8 is disposed below the vertical portion of the resonance tube 2 and is in communication with the vertical portion of the resonance tube 2. A cooler is disposed within the vertical portion of the resonance tube 2 to condense the gaseous water (water vapor) in the humid air into distilled water, which is then collected in the collection tank 8 under the action of its own gravity. Furthermore, a fan 6 is disposed at the outlet of the resonance tube 2. The blowing direction of the fan 6 is consistent with the direction from the inlet to the outlet of the resonance tube 2, thereby circulating air within the system.

[0056] When the low-temperature distilled water production system is in operation, the combined effects of the sound source 3 and the fan 6 cause the gas within the resonance tube 2 to experience a superposition of alternating and steady flows. Due to the capillary action of the thermoacoustic plate stack 4, the microchannel surfaces of the thermoacoustic plate stack 4 remain moist. Due to the thermoacoustic effect, the temperature at the air outlet of the thermoacoustic plate stack 4 is higher than the temperature at the air inlet. The phase change of the water on the walls of the thermoacoustic plate stack 4 intensifies the pumping heat effect. Under the combined effects of the temperature increase, alternating flow, and steady flow, the water on the walls of the thermoacoustic plate stack 4 evaporates and is carried out of the thermoacoustic plate stack 4 by the steady flow, forming humidified air. The humidified air flows through the cooler, where the gaseous water (water vapor) condenses on the cooler's surface and, under the influence of gravity, drips into the collection tank 8. Simultaneously, the air flows out of the resonance tube 2 via the fan 6. As the system operates, the water in the raw material tank 7 continuously evaporates and condenses in the collection tank 8, producing distilled water.

[0057] The device embodiments described above are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. Those skilled in the art may understand and implement the present invention without inventive effort.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A low-temperature distilled water preparation device based on wet thermoacoustic effect, characterized in that: include: The main body of the device includes a resonance tube, a raw material tank containing raw material liquid and a collection tank for collecting distilled water, wherein the raw material tank and the collection tank are connected to the resonance tube; at least one sound source disposed in the resonance tube; A thermoacoustic plate stack, wherein a first portion of the thermoacoustic plate stack is located in the raw material tank and immersed in the raw material liquid, a second portion of the thermoacoustic plate stack is located in the resonance tube, and the thermoacoustic plate stack is made of a water-absorbing material; A flow guide device, used to promote the flow of air from the resonance tube inlet toward the resonance tube outlet; A cooling device is provided downstream of the thermoacoustic plate stack and is located above the collecting tank.

2. The low-temperature distilled water preparation device based on wet thermoacoustic effect according to claim 1, characterized in that: The drainage device is a fan, and the blowing direction of the fan is consistent with the direction from the inlet of the resonance tube to the outlet of the resonance tube.

3. The low-temperature distilled water preparation device based on wet thermoacoustic effect according to claim 1, characterized in that: The second portion of the thermoacoustic plate stack is connected to the wall of the resonance tube.

4. The low-temperature distilled water preparation device based on wet thermoacoustic effect according to claim 1, characterized in that: The invention also includes a preheater arranged in the resonance tube, and the preheater is located between the sound source and the thermal acoustic plate stack.

5. The low-temperature distilled water preparation device based on wet thermoacoustic effect according to claim 1, characterized in that: An air filter is provided at the inlet of the resonance tube.

6. The low-temperature distilled water preparation device based on wet thermoacoustic effect according to claim 1, characterized in that: The thermoacoustic plate stack is a parallel flow channel structure or a stacked wire mesh structure.

7. The low-temperature distilled water preparation device based on wet thermoacoustic effect according to claim 1, characterized in that: The thermoacoustic plate stack is a porous medium.

8. The low-temperature distilled water preparation device based on wet thermoacoustic effect according to claim 1, characterized in that: The cooling device is a plate cooler, a shell and tube cooler, or a column and plate cooler.

9. The low-temperature distilled water preparation device based on wet thermoacoustic effect according to claim 7, characterized in that: The material of the thermoacoustic plate stack is one or more of cellulose, zeolite, cotton and linen.

10. The low-temperature distilled water preparation device based on wet thermoacoustic effect according to claim 8, characterized in that: The cooling fluid in the cooling device flows in a vertical direction.

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