CN114322330B - Integrated circulating drying water taking device and method based on solar energy - Google Patents
Integrated circulating drying water taking device and method based on solar energy Download PDFInfo
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- CN114322330B CN114322330B CN202111612912.0A CN202111612912A CN114322330B CN 114322330 B CN114322330 B CN 114322330B CN 202111612912 A CN202111612912 A CN 202111612912A CN 114322330 B CN114322330 B CN 114322330B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an integrated circulating drying water taking device and method based on solar energy, which belong to the technical field of solar energy drying and comprise a solar energy heating system, a drying system, an alternating moisture absorption desorption system, a forced liquid cooling system and a power supply system, and are specific; the solar heating system, the drying system and the moisture absorption side of the alternating moisture absorption and desorption system are sequentially connected to form a drying loop; the solar heat supply system is also sequentially connected with the desorption side of the alternating moisture absorption desorption system and the forced liquid cooling system to form a water taking loop; the power supply system supplies power to the device. According to the circulating drying water taking device and method disclosed by the invention, the convection type drying, radiation type drying and moisture absorption desorption type air water taking technology is combined, a cooperative operation strategy is executed, the organic combination of all links of the device is realized, the solar energy utilization rate and the working efficiency of the device can be greatly improved, and the continuous and stable operation duration of the device can be effectively prolonged.
Description
Technical Field
The invention relates to the technical field of solar drying, in particular to an integrated circulating drying water taking device and method based on solar energy.
Background
The solar drying technology is to dry various materials by utilizing solar energy, and the types of solar drying devices mainly comprise a greenhouse type, a heat collector and greenhouse combined type, a solar heat collector and heat pump system combined type and the like.
The adsorption type air water taking technology is a technology form of obtaining fresh water through a regeneration process of a drying agent after moisture in humid air is absorbed by adopting a liquid or solid drying agent. The liquid absorption method has the defects of complex structure, huge volume, long single circulation time, certain corrosiveness, insufficient safety of chemical reagents and the like, so that the fresh water obtained by the method is not suitable to be used as safe drinking water. In addition, compared with a refrigeration condensation method, the adsorption type air water taking technology utilizing the solid desiccant has the advantages of no need of electric energy or mechanical energy input, small occupied area, few moving parts, low operation noise, simple device structure, low operation cost, long service life, capability of utilizing the solar heat collecting device to dehumidify and the like.
The semiconductor refrigeration technology is a novel refrigeration technology for achieving the purpose of refrigeration through the Peltier effect. When current passes through a closed loop formed by semiconductors, heat absorption or heat release effects can be generated on the surfaces of two sides of the semiconductor refrigerating sheet, so that heat at the cold end of the semiconductor refrigerator flows to the hot end, the temperature at the cold end is reduced continuously, the temperature at the hot end is increased continuously, and the purpose of refrigerating and cooling can be achieved.
Most of the existing solar drying systems have single functions, are only limited to dehydrating and drying the drying materials, and cannot recycle the dehydrated water of the drying materials. In addition, the current solar adsorption water taking device is long in moisture absorption and desorption period, is limited to the operation modes of night adsorption and daytime desorption, and most adsorbents are easy to reach a water absorption saturation state, so that further dehumidification and drying cannot be performed, and therefore the solar energy utilization rate and the operation efficiency of the solar energy drying system are low.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide an integrated circulating drying water taking device and method based on solar energy.
The technical scheme adopted for solving the technical problems is as follows:
the utility model provides an integral type circulation drying water intaking device based on solar energy, including solar heating system, drying system, alternating moisture absorption desorption system, forced liquid cooling system and power supply system, specifically:
the solar heating system, the drying system and the moisture absorption side of the alternating moisture absorption and desorption system are sequentially connected to form a drying loop;
the solar heat supply system is also sequentially connected with the desorption side of the alternating moisture absorption desorption system and the forced liquid cooling system to form a water taking loop;
the power supply system supplies power to the device.
Further, the solar heat supply system comprises a first heat supply system and a second heat supply system, and an air outlet of the second heat supply system is connected with an air inlet of the drying system and is used for continuously providing hot air for the drying system; the first heating system air outlet is connected with the desorption side inlet of the alternating moisture absorption and desorption system and is used for dehumidifying and desorbing the desorption side of the alternating moisture absorption and desorption system;
the moisture absorption side of the alternating moisture absorption and desorption system is connected with the second heating system and the drying system and is used for dehumidifying the wet air exhausted by the drying system and conveying the dehumidified air to the air inlet of the second heating system; the desorption side of the alternating moisture absorption and desorption system is also connected with the first heating system, and the first heating system is utilized to dehumidify and desorb the desorption side of the alternating moisture absorption and desorption system;
The forced liquid cooling system inlet is connected with the desorption side outlet of the alternating moisture absorption desorption system, the first heat supply system air inlet is connected with the forced liquid cooling system outlet, and the forced liquid cooling system is used for cooling high-temperature wet air to form fresh water and conveying the condensed and dehydrated dry cold air to the first heat supply system air inlet.
Further, the first heat supply system and the second heat supply system are both composed of a vacuum tube type solar heat collector, the vacuum tube type solar heat collector comprises a vacuum heat collecting tube, a heat storage sleeve is arranged in the vacuum heat collecting tube, and the upper part of the vacuum heat collecting tube is communicated with a converging cavity and further comprises a fixing tube and a fixing bracket which are used for fixing;
the number of the vacuum tube type solar heat collectors in the first heat supply system is greater than that of the vacuum tube type solar heat collectors in the second heat supply system.
Further, the drying system comprises a drying box and a material rack, wherein a material tray arranged on the material rack is arranged in the drying box; the upper end face of the drying box is obliquely arranged, a glass cover plate is arranged at the upper end face of the drying box, a water collecting tank is arranged below the lower side of the glass cover plate, and an outlet of the water collecting tank is connected with a fresh water collecting bottle; the drying box is arranged below the higher side of the glass cover plate, and is provided with a wet air outlet which is communicated with the moisture absorption side of the alternating moisture absorption and desorption system.
Further, an air guide is arranged below the material rack and connected with the air outlet of the second heating system.
Further, the alternating type moisture absorption and desorption system comprises a first adsorption bed, a second adsorption bed, a first electric runner exchanger and a second electric runner exchanger, wherein the inlet ends of the first adsorption bed and the second adsorption bed are respectively connected with the wet air outlet and the air outlet of the first heating system through the first electric runner exchanger; and the outlet ends of the first adsorption bed and the second adsorption bed are respectively connected with the air inlet of the forced liquid cooling system and the air inlet of the second heating system through a second electric runner exchanger.
Further, the forced liquid cooling system comprises a steam condensing unit, a shell-and-tube air cooling unit, a cooling liquid circulation driving unit and a semiconductor cooling unit.
Further, the air inlet of the steam condensing unit is connected with the air outlet of the desorption side of the alternating moisture absorption desorption system, and the air outlet of the steam condensing unit is also connected with the air inlet of the first heating system;
or the shell-and-tube air-cooled heat dissipation unit comprises a convection cavity, wherein a heat exchange tube bundle and a baffle rib which is vertically arranged are arranged in the convection cavity; the heat exchange tube bundle extends to the steam condensing unit; an air cooling unit air outlet is formed in the other side above the convection cavity, and is connected to the first induced draft fan through a three-way valve;
Or the cooling liquid circulation driving unit comprises a semiconductor cooling bin and a switching bin which are respectively communicated with two ends of the heat exchange tube bundle, wherein the switching bin is communicated with a circulation water tank, and the circulation water tank is communicated with the semiconductor cooling bin through a circulation pump;
or, the semiconductor cooling unit comprises a cooler, a semiconductor refrigerating sheet and a radiator which are connected in sequence, and an air outlet of the semiconductor cooling unit is connected with the first induced draft fan through a pipeline.
The integrated circulating drying water taking method based on solar energy uses an integrated circulating drying water taking device based on solar energy, and specifically comprises the following steps:
s1: the cold air is heated by the first heating system and the second heating system;
s2: the high-temperature dry air flowing out of the second heating system dries materials in the drying system to generate wet air, most of the wet air is discharged through a wet air outlet, and a small part of the wet air is condensed into water drops on the inner surface of a top glass cover plate of the drying system and flows into a fresh water collecting bottle;
s3: the wet air discharged in the step S2 flows into the moisture absorption side of the alternating moisture absorption and desorption system, the wet air is dehumidified through the alternating moisture absorption and desorption system, and the dehumidified air enters the second heating system again to finish the next drying and dehydration cycle;
S4: when the moisture absorption side of the alternating moisture absorption and desorption system in the step S3 reaches a water absorption saturation state, the original moisture absorption side is quickly switched to a new desorption side, the original desorption side is quickly switched to the new moisture absorption side, the continuous quick switching and synchronous operation of the moisture absorption process and the desorption process are realized, the high-temperature dry air in the first heat supply system enters the new desorption side of the alternating moisture absorption and desorption system, and the new desorption side of the alternating moisture absorption and desorption system is dehumidified and taken;
s5: the wet air with higher temperature generated in the step S4 flows into a forced liquid cooling system, and fresh water is formed after condensation in the forced liquid cooling system; the condensed and dehumidified dry cold air enters the air inlet of the first heating system again to start the next circulation; when the wind pressure in the first heating system is too high, the redundant dry and cold air is automatically discharged into the atmosphere.
Furthermore, the first heat supply system and the second heat supply system are both composed of vacuum tube type solar heat collectors, and the number of the vacuum tube type solar heat collectors in the first heat supply system is more than that of the vacuum tube type solar heat collectors in the second heat supply system.
Compared with the prior art, the invention has the beneficial effects that:
1. According to the integrated circulation drying water taking device and method based on solar energy, which are disclosed by the invention, the convection type drying, radiation type drying and moisture absorption desorption type air water taking technology is combined, the solar heat collection technology, the semiconductor refrigeration technology, the phase change heat storage technology, the shell-and-tube air cooling design, the electric runner exchange design and the solar drying water taking technology are coupled, a cooperative operation strategy is executed, the organic combination of all links of the device is realized, the solar energy utilization rate and the device working efficiency can be greatly improved, and the continuous and stable operation duration of the device can be effectively prolonged;
2. according to the integrated circulation drying water taking device and method based on solar energy, an electric runner exchanger is designed, and an alternating moisture absorption desorption method is provided, so that compared with the traditional adsorption water taking technology, the seamless continuous switching and synchronous operation of an adsorption process and a desorption process are realized, the defect that the adsorbent is not water-absorbing after water absorption saturation is overcome, and the solar energy utilization rate and the operation efficiency of the device are further effectively improved;
3. the invention discloses an integrated circulating drying water taking device and method based on solar energy, which provides a double-effect cooling type forced condensing mechanism, and utilizes a semiconductor refrigeration and shell-and-tube heat exchange double-cooling mode to forcedly cool circulating cooling liquid, thereby greatly reducing the working temperature of the circulating cooling liquid and improving the water taking quantity and efficiency of a system;
4. According to the integrated circulating drying water taking device and method based on solar energy, disclosed by the application, the drying system is subjected to uniform/rectification design, so that the through-flow uniformity of hot air flow at the material tray of the drying system is greatly improved, the local loss of the hot air flow when flowing in the drying system is effectively reduced, the dehydration quality of materials in the drying system is ensured, and the drying efficiency is improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of the structure of the present application;
FIG. 2 is a schematic view of a heat storage kit according to the present application;
FIG. 3 is a schematic view of a manifold of the present application;
FIG. 4 is a schematic diagram of a drying system according to the present application;
FIG. 5 is a schematic view of the structure of the air guide of the present application;
FIG. 6 is a schematic diagram of an alternate moisture absorption and desorption system according to the present application;
FIG. 7 is a schematic view showing the internal structure of the first and second adsorbent beds of the present application;
FIG. 8 is a schematic diagram of a first and second electrically powered flow path exchanger according to the present application;
FIG. 9 is a rear view of the forced liquid cooling system of the present application;
FIG. 10 is a schematic diagram of the internal structure of the forced liquid cooling system according to the present application;
Fig. 11 is a schematic structural diagram of a semiconductor heat dissipation unit according to the present invention.
In the figure: 1-solar heating system, 1-1-first heating system, 1-2-second heating system, 101-evacuated collector tube, 102-confluence chamber, 103-fixed tube, 104-fixed bracket, 105-flange, 106-heat storage sleeve, 107-copper tube, 108-sleeve, 109-T-shaped rib, 110-straight plate type rib, 111-outer chamber, 112-inner chamber, 113-inner chamber threaded hole, 114-vacuum tube connecting hole, 2-drying system, 201-drying box, 202-material rack, 203-material tray, 204-air guider, 205-wet air outlet, 206-glass cover plate, 207-water collecting tank, 208-fresh water collecting bottle, 209-rectification grid, 210-air inlet homogenizer, 211-air inlet pipeline, 3-alternating moisture absorption and desorption system, 3-1-first adsorption bed, 3-2-second adsorption bed, 3-3-first electric runner exchanger, 3-4-second electric runner exchanger, 301-expanding rectification chamber, 302-reaction generating chamber, 303-outlet confluence chamber, 304-sine wave adsorption plate, 306-rotor, 306-cross-air channel, 308-air channel, 402-air channel, fan, forced air channel, 402-air channel 408-air channel, forced air channel, fan, 402-air channel 404-air channel, external air channel 408, 409-heat exchange tube bundles, 410-baffle ribs, 411-a switching bin, 412-a semiconductor cooling bin, 413-a circulating water tank, 414-a one-way valve, 415-a cooler, 416-a semiconductor refrigerating sheet, 417-a radiator, 418-a high-temperature hot air inlet, 419-an air cooling unit air inlet and 5-a power supply system.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the application are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, this embodiment provides an integrated circulation drying water intake device based on solar energy, which includes a solar heating system 1, a drying system 2, an alternating moisture absorption and desorption system 3, a forced liquid cooling system 4 and a power supply system 5, specifically:
the solar heat supply system 1 is a vacuum tube type solar heat supply system 1 and consists of two subsystems, namely a first heat supply system 1-1 and a second heat supply system 1-2.
The second heat supply system 1-2 is connected with the drying system 2, in this embodiment, the second heat supply system 1-2 is formed by connecting two vacuum tube type solar collectors in series, and an axial flow type induced air fan is installed at the hot air outlet, and the second heat supply system 1-2 continuously provides hot air for the drying system 2. The air outlet of the first heating system 1-1 is connected with the air inlet of the desorption side of the alternating moisture absorption and desorption system 3, in this embodiment, the first heating system 1-1 is formed by connecting three vacuum tube type solar collectors in series, and an axial flow induced air fan is also installed at the air outlet, and the first heating system 1-1 can heat and desorb the moisture absorbed by the desorption side of the alternating moisture absorption and desorption system 3, and send the desorbed moist hot air into the forced liquid cooling system 4 for condensation water intake.
In this embodiment, the main body of the vacuum tube solar collector is composed of 7 evacuated solar collector tubes 101, a confluence cavity 102, a fixing bracket 104, a fixing tube 103, a flange 105 and an in-tube heat storage sleeve 106.
The vacuum heat collecting tube 101 has an inner diameter of 58mm and a length of 1.5m, and the vacuum heat collecting tube 101 is internally provided with a heat storage sleeve 106 with an outer diameter of 50mm and a length of 1.4 m.
As shown in fig. 2, the heat storage sleeve 106 includes a copper pipe 107 and a sleeve 108 concentrically arranged inside and outside, and 6 t-shaped ribs 109 are uniformly distributed on the outer wall surface of the sleeve 108; the inside of the sleeve 108 is provided with bar-type ribs 110. Specifically, during processing, one end of a copper pipe 107 with the length of 1.5m, the outer diameter of 22mm and the wall thickness of 2mm is firstly turned with threads with the length of 10mm, then the threads are coaxially inserted into a copper sleeve 108 with the length of 1.4m and the inner diameter of 38mm, the copper pipe 107 at the outlet of the upper end of the sleeve 108 extends out by 10cm, and the lower end of the sleeve 108 is flush with the copper pipe 107; the two ends of the sleeve 108 are sealed by circular ring-shaped copper covers with the outer diameter of 42mm, the inner diameter of 22mm and the thickness of 2mm, and the contact parts of the copper covers and the sleeve 108 or the copper pipe 107 are welded by gas welding; after the welding is finished, a threaded hole with the diameter of 5mm is formed in the position, close to the edge, of the copper cover, and then the low-temperature phase-change heat storage material in a molten state is injected through the threaded hole; and after the phase change material is injected, plugging by adopting a sealing plug. The reinforced heat exchange ribs on the outer side of the sleeve 108 and the inner side of the copper pipe 107 can be positioned by an air welding mode or a direct casting forming mode. The T-shaped ribs 109 on the outer side wall surface of the sleeve 108 are 5cm longer than the sleeve 108, the upper end of the T-shaped ribs is flush with the sleeve 108, and the lower end of the T-shaped ribs is inserted into the positioning holes in the fixed pipe 103; the inner side of the copper pipe 107 is also provided with 6 straight-plate fins 110, and the reinforced heat transfer fins on the inner side and the outer side of the sleeve are in one-to-one correspondence around the equal radian of the axis.
As shown in fig. 3, the confluence cavity 102 is generally cylindrical and is divided into an inner layer and an outer layer, which are all made of aluminum alloy. The inner cavity 112 has one open end and one closed end, the half section of the cross axis is U-shaped, and 7 inner cavity threaded holes 113 are formed at equal intervals below the side of the inner cavity and are used for connecting the copper pipe 107; the open end and the inner end face of the flange 105 are welded by argon tungsten-arc welding. The two ends of the outer cavity 111 are both open and are coaxially arranged at the end face of the flange 105 with the inner cavity 112, the two ends and the end face of the flange 105 are welded by tungsten argon arc welding, 7 vacuum tube connecting holes 114 with the diameter slightly larger than the outer diameter of the vacuum tube are formed at the positions, facing the threaded holes 113 of the inner cavity, of the side lower part of the outer cavity 111, and sealing silica gel pads are arranged.
When the vacuum tube heat collector is integrally assembled, one threaded end of 7 heat storage sleeve members 106 passes through the vacuum tube connecting hole 114 of the outer cavity 111 and is screwed into the inner cavity threaded hole 113; then, the evacuated collector tubes 101 are sequentially sleeved into the heat storage sleeve 106, the upper ends of the vacuum tubes are sequentially extended into the vacuum tube connecting holes 114 of the outer cavity 111, and then the lower ends of the evacuated collector tubes 101 are installed into the corresponding positioning holes of the fixed tubes 103. The diameter of the central circular holes of the two side flanges 105 is the same as the inner diameter of the inner cavity 112.
The drying system 2 is a double-effect hybrid drying system 2. As shown in fig. 4, the drying system 2 includes a material tray 203, a material rack 202, an air guide 204, a glass cover 206, a water collection tank 207, a fresh water collection bottle 208, and a drying box 201 for carrying the above components.
In this embodiment, the side projection of the drying cabinet 201 is trapezoidal, and is made of aluminum alloy, and the outer surface of the maintenance structure is tightly wrapped with polystyrene foam boards with excellent heat insulation performance, and when the drying cabinet is installed and used, the shorter side of the drying cabinet 201 is installed towards the south. The sunny side of the upper end surface of the box body is covered with a glass cover plate 206 with high light transmittance, and the lighting surface of the glass cover plate faces south. Inside the box, three layers of material trays 203 are installed on a specially-made material rack 202 at equal intervals, each layer of material tray 203 is formed by one-step stamping of stainless steel plates with the thickness of 1mm, and push-pull handles are installed on the sides of the trays facing the north direction of the box. A water collecting tank 207 with a slight inclination angle is arranged on the south side of the material frame 202 and is used for collecting condensed liquid drops at the glass cover plate 206; the outlet of the water collecting tank 207 is connected with a fresh water collecting bottle 208 through a special tubule, and the liquid drops dripped into the water collecting tank 207 flow into the fresh water collecting bottle 208 under the action of gravity. The humid air outlet 205 is provided at an upper end position of the north side of the drying cabinet 201.
According to the appearance shape and size distribution of the main dry materials, a plurality of dense ventilation holes are uniformly arranged on the bottom plate of the material tray 203. In the running process of the device, in order to avoid the phenomenon that the drying object blocks the vent hole and further causes uneven drying, a plurality of bulges can be uniformly pressed by a molding press around the vent hole.
As shown in fig. 5, the air guide 204 mainly comprises a rectifying grid 209, an air inlet homogenizer 210 and an air inlet pipeline 211, and is arranged at the bottom of the drying oven 201, and the outlet of the rectifying grid 209 is opposite to the material tray 203. The whole of the air inlet homogenizer 210 is a gradually-expanding hot air channel, in order to ensure that hot air uniformly flows into the rectification grid 209, a plurality of uniform flow air guide ribs are arranged in the cavity of the homogenizer, the outlet end of the air inlet homogenizer 210 is communicated with the air inlet end at the bottom of the rectification grid 209, and the inlet end of the air inlet homogenizer 210 is detachably and hermetically connected with the air outlet of the second heating system 1-2 through an air inlet pipeline 211.
As shown in fig. 6, the alternating type moisture absorption and desorption system 3 comprises a first adsorption bed 3-1, a second adsorption bed 3-2, a first electric runner exchanger 3-3 and a second electric runner exchanger 3-4 which are arranged side by side, wherein the inlet and outlet positions of the two adsorption beds are connected with the corresponding electric runner exchanger interfaces through pipelines, and the interfaces are connected through threads. The inlet ends of the first adsorption bed 3-1 and the second adsorption bed 3-2 are respectively connected with the wet air outlet 205 and the air outlet of the first heating system 1-1 through a first electric runner exchanger 3-3 in a mode of continuously switching communication ports; the outlet ends of the first adsorption bed 3-1 and the second adsorption bed 3-2 are respectively connected with the air inlet of the forced liquid cooling system 4 and the air inlet of the second heating system 1-2 through a second electric runner exchanger 3-4 in a mode of continuously switching communication ports.
As shown in fig. 7, the adsorption bed is composed of three parts, namely a divergent rectification cavity 301, a reaction generation cavity 302 and an outlet confluence cavity 303. According to the structure and the size of the cavity, a special multichannel gradually-expanding rectification grid is arranged in the gradually-expanding rectification cavity 301, and the grid is made of an aluminum alloy material; the outlet end of the gradually-expanding rectifying cavity 301 is connected with the inlet of the reaction generating cavity 302, a special sine wave type adsorption plate 304 is transversely arranged in the reaction generating cavity 302, the main component of the adsorption plate is sodium polyacrylate fiber, the fiber diameter is about 30 mu m, the mass of water absorbed in about 15 seconds is 70-100 times of the mass of the water, the Limiting Oxygen Index (LOI) is 10, and the flame retardance is good; the outlet end of the reaction generating chamber 302 is connected with an outlet converging chamber 303, the whole appearance of which is a quadrangular pyramid, and the chamber maintenance structure material is preferably aluminum alloy.
As shown in fig. 8, the electric runner exchanger includes an electric rotor 305 and an outer stator 306. The electric rotor 305 has a cylindrical shape, and two direct current flow channels 307 and two intersecting flow channels 308 are provided therein, and the diameters of the flow channels are the same. The center lines of the two direct current flow channels 307 are axisymmetrically distributed about the rotor center line, the center lines of the two crossed flow channels 308 are centrosymmetrically distributed about the rotor center line, and the flow channels are distributed in the form of equal radius and equal radian around the center of the end surface at the corresponding circular interfaces of the two end surfaces. One end of the rotor, which is close to the adsorption bed, is called an inner end face, the other end is called an outer end face, and a round hole capable of being provided with a flat key is formed in the center of the outer end face and used for being connected with a motor rotating shaft. The electric rotor 305 is printed by a 3D printer, and its main material is a colloidal photosensitive resin composed of a high polymer material. The outer stator 306 is generally shaped as a flanged sleeve, with the flange being threadably coupled to the sleeve. Two threaded holes with the same diameter as the runner of the electric rotor 305 are respectively formed in the inner end face and the outer end face of the outer stator 306 and are used for connecting pipelines, the two threaded holes are symmetrical about the center of the end face, the center distance of the threads is the same as the center distance of the round holes of the end face of the inner runner, and smooth airflow passages can be accurately formed between the runner of the rotor and the corresponding threaded holes. A round hole is formed in the center of the outer end face of the stator, a roller bearing is embedded in the round hole, and the inner diameter of the bearing is the same as the diameter of the center hole of the outer end face of the rotor.
As shown in fig. 9, the forced liquid cooling system 4 is a double-effect cooling forced liquid cooling system 4, and includes a semiconductor cooling unit, a shell-and-tube air cooling unit, a cooling liquid circulation driving unit, a vapor condensing unit, and a box body for carrying the units.
As shown in fig. 10, the steam condensing unit is connected with an air outlet of the alternating moisture absorption and desorption system 3, the steam condensing unit comprises a high-temperature air inlet 418 and a steam condensing bin 401, a filter 402 is arranged in the steam condensing bin 401, a water receiving tank 403 is arranged below the filter 402, and a fresh water collector 404 is arranged below the water receiving tank 403; a dry and cold air outlet 405 positioned above the filter 402 is arranged on the wall of the steam condensation bin 401, and the dry and cold air outlet 405 is respectively connected to a three-way valve at the outlet end of the first induced draft fan 406 and the inlet end of the second induced draft fan 407 through an electric three-way valve; the three-way valve at the outlet end of the first induced draft fan 406 is connected with the inlet end of the first heating system 1-1 through a pipeline, and the outlet of the second induced draft fan 407 is connected to the atmosphere.
In this embodiment, the high-temperature hot air inlet 418 is connected with the air outlet of the alternating moisture absorption and desorption system 3, the pipeline is in a divergent shape, the lower end is connected with the steam condensation bin 401, the outlet is opposite to the heat exchange tube bundle 409, and the pipeline is fixedly connected with the box body; the filter 402 is composed of five layers of flat ceramic membranes which are arranged in parallel in a clamping groove arranged in the box body; the dry cold air outlet 405 is slightly higher than the filter 402, and a flat type hydrophobic ceramic membrane is arranged at the outlet; the water receiving tank 403 is positioned below the filter 402, is in an inverted triangle shape as a whole, and is connected with the fresh water collector 404 at the bottom. The dry and cold air outlet 405 is connected to a three-way valve at the outlet end of the first induced draft fan 406 and the inlet end of the second induced draft fan 407 respectively through an electric three-way valve; the three-way valve at the outlet end of the first induced draft fan 406 is connected to the inlet end of the first heating system 1-1 through a pipeline; the outlet of the second induced draft fan 407 is connected to the atmosphere.
The shell-and-tube air cooling unit comprises a convection cavity 408, an air cooling unit air inlet 419 is formed in one side above the convection cavity 408, a heat exchange tube bundle 409 and vertically arranged baffle ribs 410 are arranged in the convection cavity 408, and the baffle ribs 410 are provided with a plurality of baffle ribs and are respectively and alternately connected with the top and the bottom of the convection cavity 408; the heat exchanger tube bundle 409 extends to the steam condensing unit; an air cooling unit air outlet is arranged on the other side above the convection cavity 408, and the air cooling unit air outlet is connected to the inlet of the first induced draft fan 406 through a three-way valve.
In this embodiment, the air inlet of the air cooling unit is in a divergent shape and is arranged at the top of the convection cavity 408, and the air inlet is opposite to the leftmost side of the heat exchange tube bundle 409; the baffle ribs 410 are five in number, the longitudinal length of the ribs is the same as the longitudinal width of the box body, the vertical width is slightly smaller than the height of the convection cavity 408, the baffle ribs are respectively and alternately arranged in clamping grooves designated at the top and bottom positions of the convection cavity 408, three baffle ribs are arranged at the top position, two baffle ribs are arranged at the bottom position and are made of aluminum alloy materials, the distance between every two adjacent baffle ribs is about 10cm, after the installation of the ribs is finished, the box body is placed at a laser cutting table, then 11 groups of positioning holes are uniformly formed in the upper side position of the left wall of the box body from left to right by a laser cutting machine, and laser beams sequentially pass through the left side wall surface of the box body, the baffle ribs 410, a middle baffle plate in the box body and the right side wall surface of the box body, so that orderly positioning Kong Shu is formed, and the diameters of the positioning holes are 17mm; the heat exchange tube bundle 409 is composed of 11 copper heat exchange tubes, the length of which is the same as the length of the box body in the left-right direction, and the wall thickness is 1mm; before the heat radiation unit is installed, 11 heat exchange pipes are respectively inserted from the positioning holes on the right side wall surface of the box body and pass through the positioning holes of the middle partition plate, then the two end surfaces of each copper pipe 107 in the pipe bundle are level with the left and right walls of the box body, and the connection parts of the end surfaces are welded and fixed and uniformly coated with high-temperature-resistant waterproof materials; the air outlet is positioned at the right side of the top of the convection cavity 408, and is connected to the first induced draft fan 406 through a three-way valve.
The cooling liquid circulation driving unit comprises a semiconductor cooling bin 412 and a switching bin 411 which are respectively communicated with two ends of the heat exchange tube bundle 409, the switching bin 411 is connected with a circulating water tank 413, and the circulating water tank 413 is communicated with the semiconductor cooling bin 412 through a circulating pump.
In the embodiment, the switching bin 411 is arranged at the top of the left side wall surface of the box body, the mounting holes on the right side surface of the switching bin 411 completely cover 11 positioning holes, and the connection part is welded and fixed and is subjected to waterproof treatment; the lower end of the switching bin 411 is provided with a hole and is detachably connected to the water inlet of the circulating water tank 413 through a pipeline; the circulating water tank 413 is positioned at the left lower part of the tank body, the outlet is detachably connected to the axial inlet end of a circulating pump through a pipeline, the circulating pump is a standard 304 stainless steel centrifugal circulating pump, the model is 25WBS2-8, the power is 250W, and the maximum lift is 10m, so that the circulating water tank can be applied to an acid-base working environment; the radial outlet end of the circulating pump is connected with a one-way valve 414 and then is connected to an inlet below the semiconductor cooling bin 412 through a pipeline; the semiconductor cooling bin 412 is arranged at the top of the right side wall surface of the box body, the positioning hole is completely covered by the mounting hole of the left side end surface of the semiconductor cooling bin 412, and the joint is welded and fixed and is subjected to waterproof treatment; in order to adapt to low-temperature environment in winter, the circulating cooling liquid used by the system can be selected as antifreeze.
As shown in fig. 11, the semiconductor cooling unit includes a cooler 415, a semiconductor cooling fin 416, and a radiator 417, and an air outlet of the semiconductor cooling unit is connected to the first induced draft fan 406 through a pipe. In order to reduce the difficulty in processing and mounting the semiconductor cooling unit, in this embodiment, the cooler 415 and the radiator 417 are universal radiating blocks with uniform specifications, and are made of 6063 aluminum material, 150mm long, 100mm wide, 36mm high, 0.8mm tooth thickness, 2.93mm tooth space and 2mm bottom thickness; the semiconductor cooling fin 416 has an external dimension of 130mm×80mm×3.6mm, a rated voltage of 12V, a maximum operating current of 10A, and a maximum power of 120W; the external dimension of the induced air duct is 150mm multiplied by 100mm multiplied by 39mm, the wall thickness is 1.5mm, the induced air duct is made of aluminum alloy, and the side surface is provided with a mounting hole with the dimension of 130mm multiplied by 80mm by a laser cutting machine; the air outlet is connected with a gradually-expanding gas collecting pipeline, and the joint is welded by argon arc welding; during installation, the heat-conducting silica gel is uniformly smeared on the contact surface of the cooler 415 and the radiator 417, and is respectively stuck on the cooling side and the heat dissipation side of the semiconductor refrigerating sheet 416, the teeth of the cooler 415 are installed up and down, the teeth of the radiator 417 are installed in the front and back directions, and then the heat-conducting silica gel is dried by hot air. After the drying is finished, the heat radiation side of the bonded liquid cooling module is extended into the induced air duct mounting hole, and when the tooth end face of the radiator 417 is fully attached to the end face of the induced air duct mounting hole, argon arc welding is adopted at the contact line; after the process is finished, the cooling side is extended into the semiconductor cooling bin 412 on the left side wall surface of the box body, and the contact surface is welded by argon arc welding; considering that the flowing working medium in the semiconductor cooling bin 412 is liquid, a layer of waterproof glue is smeared at the welding position to prevent leakage; in order to avoid the falling phenomenon caused by the infirm connection of the contact surfaces, a right-angle bracket is additionally arranged at the bottom of the semiconductor radiating unit after the semiconductor radiating unit is installed, the upper end of the bracket is tightly contacted with the radiating unit, and the left end of the bracket is fixed at the right side wall surface of the box body.
The power supply system 5 is a photovoltaic power supply system 5 and supplies power to the whole device.
The integrated circulating drying water taking method based on solar energy comprises the following steps of:
s1: the cold air is heated by the first heating system 1-1 and the second heating system 1-2;
s2: the high-temperature dry air flowing out of the second heat supply system 1-2 dries materials in the drying system 2 to generate wet air, most of the wet air is discharged through the wet air outlet 205, and a small part of the wet air is condensed into water drops on the inner surface of the top glass cover plate of the drying system 2 and flows into the fresh water collection bottle 208;
s3: the wet air discharged in the step S2 flows into the moisture absorption side of the alternating moisture absorption and desorption system 3, the wet air is dehumidified through the alternating moisture absorption and desorption system 3, and the dehumidified air enters the second heat supply system 1-2 again to finish the next drying and dehydration cycle;
s4: when the moisture absorption side of the alternating moisture absorption and desorption system 3 in the step S3 reaches a water absorption saturation state, the original moisture absorption side is quickly switched to a new moisture absorption side, the continuous quick switching and synchronous operation of the moisture absorption process and the desorption process are realized, and then high-temperature dry air in the first heat supply system 1-1 enters the new moisture absorption side of the alternating moisture absorption and desorption system 3, and dehumidifies and takes water from the new moisture absorption side of the alternating moisture absorption and desorption system 3;
S5: the wet air flow with higher temperature generated in the step S4 flows into the forced liquid cooling system 4, and forms fresh water after condensation in the forced liquid cooling system 4; the condensed and dehumidified dry cold air enters the air inlet of the first heating system 1-2 again to start the next circulation; when the wind pressure in the first heating system 1-1 is too high, the surplus dry and cool air will be automatically discharged into the atmosphere.
Specific:
the heat supply method of the solar heat supply system 1 with the phase change heat storage comprises the following steps:
when the system operates, normal-temperature air firstly enters from the opening end of the inner cavity 112, then flows into the copper pipe 107 in the heat storage sleeve 106 through seven parallel threaded holes at the side lower part of the inner cavity 112, and the low-temperature phase-change heat storage material performs primary preheating on the inflow normal-temperature air through the copper pipe 107 wall and the straight plate type reinforced heat exchange fins in the copper pipe 107 wall; the preheated air flow turns 180 degrees at the bottom of the copper pipe 107 and flows out of the evacuated collector tube 101 along the outer side of the sleeve 108, in the process, the air flow directly sweeps out the inner wall of the evacuated collector tube 101, after absorbing a large amount of radiant heat, the temperature rises rapidly and exceeds the temperature of the phase change material layer, and then a part of heat is transferred to the low-temperature phase change heat storage material through the wall of the sleeve 108 and the T-shaped ribs 109; the hot air flowing out of each evacuated collector tube is converged in the outer chamber 111, flows into the next-stage collector through the center hole of the flange 105, and is warmed up again. To reduce heat loss from the hot gas stream in the outer chamber 111, an insulating layer is provided on the outer surface of the outer chamber 111. When the device is operating at night, the low temperature phase change heat storage material within the heat storage kit 106 begins to release heat outwardly, thereby providing operating energy to the system.
The drying method of the double-effect hybrid drying system 2 is as follows:
convection drying in the drying system 2 is the first effect, the principle being: the high-temperature dry air flowing out of the second heating system 1-2 enters an air inlet homogenizer 210 from an air inlet below the drying box 201, uniformly flows into a rectification grid 209 under the uniform flow effect of an air guide 204, and the high-temperature dry air rectified by the rectification grid 209 uniformly and directly performs convection type drying on the dry material through the ventilation holes on the three-layer material tray 203; in this process, moisture contained in the dry material continuously permeates through the epidermis and mixes with the high-temperature air to form wet air, and finally flows out from the wet air outlet 205 above the back plate of the box body. The second effect is radiation type drying, and the solar rays directly dry the materials in a closed drying mode through the glass cover plate 206, so that the temperature inside the drying box 201 is further increased, and the evaporation speed of the moisture inside the dried materials is accelerated. Most of the water vapor generated in the box body is fully mixed with hot air in a convection way to form humid air, and flows out of the humid air outlet 205, and a small part of the water vapor is condensed at the inner side wall surface of the glass cover plate 206, rolls down to the water collecting tank 207 under the action of gravity, and finally flows into the fresh water collecting bottle 208.
The moisture absorption and desorption method of the alternating moisture absorption and desorption system 3 comprises the following steps:
at the initial stage of system start-up, the airflow channel of the system is a direct current channel 307; the wet air flowing out from the wet air outlet 205 of the drying box 201 enters one of the adsorption beds (original adsorption beds) through the first electric runner exchanger 3-3, and uniformly flows into the reaction generating cavity 302 under the rectification action of the gradual expansion rectification cavity 301; the cavity and the grid are gradually expanded, so that the local loss is small; after the humid air enters the reaction generating cavity 302, under the action of the diversion and turbulent flow of the sine wave type adsorption plate 304, a thermal boundary layer and a velocity boundary layer formed on the surface of the adsorption plate 304 by the humid air flow are destroyed, so that the humid air can be fully contacted with the surface of the adsorption plate 304, and moisture carried in the humid air can be fully adsorbed by the adsorption plate 304 under the high-strength moisture absorption action of the sodium polyacrylate fiber, and the process can thoroughly dehumidify the humid air flowing out of the drying box; the dehumidified dry air is collected in the outlet confluence chamber 303 and then flows into the second heating system 1-2 through the second electric flow passage exchanger 3-4, thereby starting the next drying-dehumidification cycle. When the adsorption plate 304 reaches the water saturation state, the electric runner exchanger automatically switches the airflow runner to the cross runner 308, i.e. the original adsorption side is switched to the new desorption side, and the other adsorption bed is switched to the new adsorption side. The high-temperature dry air from the first heat supply system 1-2 flows into the new desorption side adsorption bed through the first electric runner exchanger 3-3, and the temperature of the hot air output by the first heat supply system 1-1 is higher than that of the wet air output by the drying system 2 because the first heat supply system 1-1 is one more heat collector compared with the second heat supply system 1-2; the high-temperature dry air fully contacts with the new desorption side adsorption plate, heats the adsorption plate and enables adsorbed moisture to be rapidly evaporated, and then is mixed with the dry air to form wet air flow; the wet air flow with higher temperature flows into the forced liquid cooling system 4 through the second electric runner exchanger 3-4 at the outlet end. After that, the adsorption process and the desorption process are performed synchronously, and when the adsorption side reaches the water absorption saturation state, the original adsorption side is automatically switched to the new desorption side, and the original desorption side is simultaneously switched to the new adsorption side.
The condensation method of the double-effect cooling type forced liquid cooling system 4 comprises the following steps:
when the device is operated, the circulating pump drives the cooling liquid to start circulating. The high-temperature wet air flowing out of the desorption side of the alternating moisture absorption and desorption system flows into the steam condensation bin 401 through a high-temperature wet air inlet pipeline above the box body, and then performs convection heat exchange with circulating cooling liquid in the heat exchange tube bundle 409 through the tube wall, so that water vapor in the air flow is condensed and liquid drops are formed; the liquid drops drop into the filter 402 under the action of gravity, and the filter 402 can effectively intercept trace impurities and fine particles in the airflow; purified water filtered by the filter 402 flows into the water receiving tank 403 and finally enters the fresh water collector 404. The condensed and dehumidified dry cold air flows into a three-way valve at the outlet of the first induced air fan 406 through an outlet, then flows into an air inlet of the first heating system 1-1, and starts the next circulation; the flat hydrophobic ceramic membrane at the dry cold air outlet 405 can prevent fine liquid drops from leaking, only air and a small amount of water vapor can pass through, and the water production efficiency of the system is further improved; when the wind pressure in the first heating system 1-1 is too high, the redundant dry and cool air is discharged into the atmosphere through the second induced air fan 407 under the regulation of the electric three-way valve.
After the semiconductor refrigeration piece 416 is connected with direct current, the semiconductor refrigeration piece 416 absorbs heat in the circulating cooling liquid through the cooler 415 at the left side of the semiconductor refrigeration piece, and then the cooling liquid is cooled in a first effect; under the suction effect of the first induced draft fan 406, normal-temperature air in the atmospheric environment flows into the air duct on the heat radiation side and the air inlet of the air cooling unit above the box body respectively, and in the air duct, the cold air performs convection heat exchange with the forced heat exchange fins and the pipe wall in the radiator 417, so that the heat production of the refrigerating sheet is taken away; after entering the convection cavity 408, the cold air performs convection heat exchange with the cooling liquid in the heat exchange tube bundle 409 under the action of the baffle ribs 410, so as to realize second-effect cooling, and then, the cold air is converged with the air flowing out of the semiconductor cooling unit, and finally, the cold air flows into the air inlet of the first heating system 1-1.
It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (8)
1. The utility model provides an integral type circulation drying water intaking device based on solar energy, its characterized in that includes solar energy heating system, drying system, alternating moisture absorption desorption system, forced liquid cooling system and power supply system, specifically:
the solar heating system, the drying system and the moisture absorption side of the alternating moisture absorption and desorption system are sequentially connected to form a drying loop;
the solar heat supply system is also sequentially connected with the desorption side of the alternating moisture absorption desorption system and the forced liquid cooling system to form a water taking loop;
the power supply system supplies power for the device;
the solar heat supply system comprises a first heat supply system and a second heat supply system, and an air outlet of the second heat supply system is connected with an air inlet of the drying system and is used for continuously providing hot air for the drying system; the first heating system air outlet is connected with the desorption side inlet of the alternating moisture absorption and desorption system and is used for dehumidifying and desorbing the desorption side of the alternating moisture absorption and desorption system;
the moisture absorption side of the alternating moisture absorption and desorption system is connected with the second heating system and the drying system and is used for dehumidifying the wet air exhausted by the drying system and conveying the dehumidified air to the air inlet of the second heating system; the desorption side of the alternating moisture absorption and desorption system is also connected with the first heating system, and the first heating system is utilized to dehumidify and desorb the desorption side of the alternating moisture absorption and desorption system;
The forced liquid cooling system inlet is connected with the desorption side outlet of the alternating moisture absorption and desorption system, the first heat supply system air inlet is connected with the forced liquid cooling system outlet, and the forced liquid cooling system is used for cooling high-temperature wet air to form fresh water and conveying the condensed and dehydrated dry cold air to the first heat supply system air inlet;
the first heat supply system and the second heat supply system are both composed of a vacuum tube type solar heat collector, the vacuum tube type solar heat collector comprises a vacuum heat collecting tube, a heat storage sleeve is arranged in the vacuum heat collecting tube, and the upper part of the vacuum heat collecting tube is communicated with a converging cavity and also comprises a fixing tube and a fixing bracket which are used for fixing;
the number of the vacuum tube type solar heat collectors in the first heat supply system is greater than that of the vacuum tube type solar heat collectors in the second heat supply system;
the main body part of the vacuum tube type solar collector consists of 7 vacuum heat collecting tubes, a converging cavity, a fixed bracket, a fixed tube, a flange and an in-tube heat storage sleeve, wherein the heat storage sleeve is arranged in the vacuum heat collecting tubes; the heat storage sleeve comprises copper pipes and sleeves which are concentrically arranged inside and outside, and 6T-shaped ribs are uniformly distributed on the outer wall surface of each sleeve; the inner side of the copper pipe is provided with a straight-plate type rib.
2. The solar-based integrated circulating drying water intake device of claim 1, wherein the drying system comprises a drying oven and a material rack, and a material tray arranged on the material rack is arranged in the drying oven;
the upper end face of the drying box is obliquely arranged, a glass cover plate is arranged at the upper end face of the drying box, a water collecting tank is arranged below the lower side of the glass cover plate, and an outlet of the water collecting tank is connected with a fresh water collecting bottle; the drying box is arranged below the higher side of the glass cover plate, and is provided with a wet air outlet which is communicated with the moisture absorption side of the alternating moisture absorption and desorption system.
3. The solar-based integrated circulation drying water intake device of claim 2, wherein an air guide is arranged below the material rack, and the air guide is connected with the air outlet of the second heating system.
4. The solar-based integrated circulation drying water intake device of claim 2, wherein the alternating moisture absorption and desorption system comprises a first adsorption bed, a second adsorption bed, a first electric runner exchanger and a second electric runner exchanger, wherein inlet ends of the first adsorption bed and the second adsorption bed are respectively connected with the wet air outlet and the first heating system air outlet through the first electric runner exchanger; and the outlet ends of the first adsorption bed and the second adsorption bed are respectively connected with the air inlet of the forced liquid cooling system and the air inlet of the second heating system through a second electric runner exchanger.
5. The solar-based integrated circulation drying water intake device of claim 1, wherein the forced liquid cooling system comprises a vapor condensing unit, a shell-and-tube air cooling unit, a cooling liquid circulation driving unit and a semiconductor cooling unit.
6. The solar-based integrated circulation drying water intake device of claim 5, wherein the steam condensing unit air inlet is connected with the alternating moisture absorption desorption system desorption side air outlet, and the steam condensing unit air outlet is also connected with the first heating system air inlet;
the shell-and-tube air cooling unit comprises a convection cavity, wherein a heat exchange tube bundle and a baffle rib which is vertically arranged are arranged in the convection cavity; the heat exchange tube bundle extends to the steam condensing unit; an air cooling unit air outlet is formed in the other side above the convection cavity, and is connected to a first induced air fan through a three-way valve;
the cooling liquid circulation driving unit comprises a semiconductor cooling bin and a switching bin which are respectively communicated with two ends of the heat exchange tube bundle, the switching bin is communicated with a circulation water tank, and the circulation water tank is communicated with the semiconductor cooling bin through a circulation pump;
The semiconductor cooling unit comprises a cooler, a semiconductor refrigerating sheet and a radiator which are connected in sequence, and an air outlet of the semiconductor cooling unit is connected with the first induced air fan through a pipeline.
7. A solar-based integrated circulation drying water intake method, characterized in that the solar-based integrated circulation drying water intake device according to any one of claims 1-6 is used, and specifically comprises the following steps:
s1: the cold air is heated by the first heating system and the second heating system;
s2: the high-temperature dry air flowing out of the second heating system dries materials in the drying system to generate wet air, most of the wet air is discharged through a wet air outlet, and a small part of the wet air is condensed into water drops on the inner surface of a top glass cover plate of the drying system and flows into a fresh water collecting bottle;
s3: the wet air discharged in the step S2 flows into the moisture absorption side of the alternating moisture absorption and desorption system, the wet air is dehumidified through the alternating moisture absorption and desorption system, and the dehumidified air enters the second heating system again to finish the next drying and dehydration cycle;
s4: when the moisture absorption side of the alternating moisture absorption and desorption system in the step S3 reaches a water absorption saturation state, the original moisture absorption side is quickly switched to a new desorption side, the original desorption side is quickly switched to the new moisture absorption side, the continuous quick switching and synchronous operation of the moisture absorption process and the desorption process are realized, the high-temperature dry air in the first heat supply system enters the new desorption side of the alternating moisture absorption and desorption system, and the new desorption side of the alternating moisture absorption and desorption system is dehumidified and taken;
S5: the wet air with higher temperature generated in the step S4 flows into a forced liquid cooling system, and fresh water is formed after condensation in the forced liquid cooling system; the condensed and dehumidified dry cold air enters the air inlet of the first heating system again to start the next circulation; when the wind pressure in the first heating system is too high, the redundant dry and cold air is automatically discharged into the atmosphere.
8. The solar-based integrated circulation drying water intake method of claim 7, wherein the first and second heating systems are each composed of vacuum tube solar collectors, and the number of vacuum tube solar collectors in the first heating system is greater than the number of vacuum tube solar collectors in the second heating system.
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