CN114322330A - Solar-energy-based integrated circulating drying water taking device and method - Google Patents
Solar-energy-based integrated circulating drying water taking device and method Download PDFInfo
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- CN114322330A CN114322330A CN202111612912.0A CN202111612912A CN114322330A CN 114322330 A CN114322330 A CN 114322330A CN 202111612912 A CN202111612912 A CN 202111612912A CN 114322330 A CN114322330 A CN 114322330A
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Abstract
The invention discloses an integrated circulating drying water taking device and method based on solar energy, belonging to the technical field of solar energy drying, and comprising a solar energy heat supply system, a drying system, an alternative moisture absorption and desorption system, a forced liquid cooling system and a power supply system; the solar heat supply system, the drying system and the moisture absorption sides of the alternative 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 the circulating drying water taking method, the convection type drying technology, the radiation type drying technology and the moisture absorption desorption type air water taking technology are combined, a cooperative operation strategy is executed, all links of the device are organically combined, 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 using solar energy, and the types of the solar drying device 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 technical form of obtaining fresh water through the regeneration process of a drying agent after absorbing moisture in humid air by adopting a liquid or solid drying agent. Among them, the liquid absorption method has many defects of complex device structure, large volume, long single cycle time, certain corrosiveness, insufficient safety of chemical reagents and the like, so that the fresh water obtained by the method is not suitable for being used as safe drinking water. In addition, compared with a refrigeration and condensation method, the adsorption type air water taking technology utilizing the solid drying agent 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 dehumidifying by utilizing a solar heat collecting device and the like.
The semiconductor refrigeration technology is a novel refrigeration technology which achieves 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 the 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 of the cold end is continuously reduced, the temperature of the hot end is continuously increased, and the purposes of refrigerating and cooling can be achieved.
Most of the existing solar drying systems have single functions, are only limited to dewatering and drying of dried materials, and cannot realize recycling of moisture removed from the dried materials. In addition, the current mainstream solar adsorption water intake device has a long moisture absorption and desorption period, which is limited to the operation modes of "night adsorption and daytime desorption", and most of the adsorbents are easy to reach a moisture absorption saturation state, so that the further dehumidification and drying cannot be performed, and therefore, the solar energy utilization rate and the operation efficiency of the solar drying system are very 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 by the invention 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 energy heating system, drying system, alternate moisture absorption desorption system, forced liquid cooling system and power supply system, it is specific:
the solar heat supply system, the drying system and the moisture absorption sides of the alternative 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 heating system comprises a first heating system and a second heating system, and an air outlet of the second heating system is connected with an air inlet of the drying system and is used for continuously providing hot air for the drying system; the air outlet of the first heat supply system is connected with the desorption side inlet of the alternative moisture absorption desorption system and is used for dehumidifying and desorbing the desorption side of the alternative moisture absorption desorption system;
the moisture absorption side of the alternating moisture absorption and desorption system is connected with the second heat supply system and the drying system and is used for dehumidifying the humid air exhausted by the drying system and conveying the dehumidified air to an air inlet of the second heat supply system; the desorption side of the alternating moisture absorption desorption system is also connected with the first heat supply system, and the first heat supply system is used for dehumidifying and desorbing the desorption side of the alternating moisture absorption desorption system;
the forced liquid cooling system inlet is connected with the desorption side outlet of the alternative moisture absorption desorption system, the first heat supply system air inlet is connected with the forced liquid cooling system outlet, the forced liquid cooling system is used for cooling high-temperature wet air to form fresh water, and the dry cold air after condensation and dehydration is conveyed to the first heat supply system air inlet.
Furthermore, 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 member is arranged in the vacuum heat collecting tube, the upper part of the vacuum heat collecting tube is communicated with the confluence cavity, and the first heat supply system and the second heat supply system also comprise a fixed tube and a fixed support which are used for fixing;
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.
Furthermore, the drying system comprises a drying box and a material rack, and 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 on 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 positioned below the higher side of the glass cover plate, and a wet air outlet is arranged below the higher side of the glass cover plate and communicated with the moisture absorption side of the alternating moisture absorption and desorption system.
Further, an air guide device is arranged below the material rack and connected with an air outlet of the second heating system.
Furthermore, the alternating type moisture absorption and desorption system comprises a first adsorption bed, a second adsorption bed, a first electric flow channel exchanger and a second electric flow channel exchanger, wherein the inlet ends of the first adsorption bed and the second adsorption bed are respectively connected with the humid air outlet and the air outlet of the first heat supply system through the first electric flow channel 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 heat supply system through a second electric flow channel exchanger.
Furthermore, the forced liquid cooling system comprises a steam condensation unit, a shell-and-tube air cooling unit, a cooling liquid circulating driving unit and a semiconductor cooling unit.
Further, the air inlet of the steam condensation unit is connected with the desorption side air outlet of the alternating type moisture absorption and desorption system, and the air outlet of the steam condensation unit is also connected with the air inlet of the first heat supply system;
or, the shell-and-tube air-cooled heat dissipation unit comprises a convection cavity, and a heat exchange tube bundle and vertically arranged baffling fins 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 circulating drive 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 circulating water tank, and the circulating water tank is communicated with the semiconductor cooling bin through a circulating pump;
or the semiconductor cooling unit comprises a cooler, a semiconductor refrigerating sheet and a radiator which are sequentially connected, and an air outlet of the semiconductor cooling unit is connected with the first induced draft fan through a pipeline.
An integrated solar-based circulating drying water taking method, which is characterized in that the integrated solar-based circulating drying water taking device according to any one of claims 2-8 is used, and 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 heat supply system dries the 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 alternative moisture absorption and desorption system, the wet air is dehumidified by the alternative moisture absorption and desorption system, and the dehumidified air reenters the second heat supply system to complete the next drying and dehydrating cycle;
s4: when the moisture absorption side of the alternative moisture absorption and desorption system in the step S3 reaches a moisture absorption saturation state, the original moisture absorption side is rapidly switched to a new desorption side, the original desorption side is rapidly switched to a new moisture absorption side, continuous rapid switching and synchronous operation of a moisture absorption process and a desorption process are realized, high-temperature dry air in the first heat supply system enters the new desorption side of the alternative moisture absorption and desorption system, and dehumidification and water taking are performed on the new desorption side of the alternative moisture absorption and desorption system;
s5: the humid air with higher temperature generated in the step S4 flows into the forced liquid cooling system and is condensed in the forced liquid cooling system to form fresh water; the condensed and dehumidified dry cold air enters the air inlet of the first heat supply system again to start the next circulation; when the wind pressure in the first heating system is too high, the redundant dry cold air is automatically discharged into the atmospheric environment.
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. the device combines convection drying, radiation drying and moisture absorption desorption air water taking technologies, couples a solar heat collection technology, a semiconductor refrigeration technology, a phase change heat storage technology, a shell-and-tube air cooling design, an electric runner exchange design and the solar drying water taking technology, executes a cooperative operation strategy, realizes organic combination of all links of the device, can greatly improve the solar utilization rate and the working efficiency of the device, and can effectively prolong the continuous and stable operation time of the device;
2. compared with the traditional adsorption water taking technology, the integrated circulation drying water taking device and the integrated circulation drying water taking method based on the solar energy, which are disclosed by the invention, have the advantages that seamless continuous switching and synchronous operation of an adsorption process and a desorption process are realized, the defect that an adsorbent cannot absorb water after being saturated in water is overcome, and the solar energy utilization rate and the operation efficiency of the device are effectively improved;
3. the invention discloses an integrated circulating drying water taking device and method based on solar energy, and provides a double-effect cooling type forced condensation mechanism, wherein a semiconductor refrigeration and shell-and-tube heat exchange double-cooling mode is utilized to carry out forced cooling on circulating cooling liquid, so that the working temperature of the circulating cooling liquid is greatly reduced, and the water taking amount and the water taking efficiency of a system are improved;
4. according to the integrated circulating drying water taking device and method based on solar energy, disclosed by the invention, the drying system is subjected to uniform/rectifying design, 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 in the drying system is effectively reduced, the dehydration quality of the material 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 following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a heat storage kit according to the present invention;
FIG. 3 is a schematic view of a chamber according to the present invention;
FIG. 4 is a schematic diagram of a drying system according to the present invention;
FIG. 5 is a schematic view of the structure of the air guide of the present invention;
FIG. 6 is a schematic view of an alternative moisture absorption and desorption system according to the present invention;
FIG. 7 is a schematic view showing the internal structure of the first and second adsorption beds according to the present invention;
FIG. 8 is a schematic structural diagram of a first and a second electric flow channel exchanger according to the present invention;
FIG. 9 is a rear view of a forced liquid cooling system of the present invention;
FIG. 10 is a schematic diagram of the internal structure of the forced liquid cooling system according to the present invention;
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-vacuum heat collecting pipe, 102-converging cavity, 103-fixing pipe, 104-fixing bracket, 105-flange, 106-heat storage kit, 107-copper pipe, 108-sleeve, 109-T-shaped fin, 110-straight fin, 111-outer cavity, 112-inner cavity, 113-inner cavity threaded hole, 114-vacuum pipe connecting hole, 2-drying system, 201-drying box, 202-material rack, 203-material tray, 204-air guide, 205-wet air outlet, 206-glass cover plate, 207-water collecting groove, 208-fresh water collecting bottle, 209-rectifying grid, 210-air inlet air homogenizer, 211-an air inlet pipeline, 3-an alternative moisture absorption and desorption system, 3-1-a first adsorption bed, 3-2-a second adsorption bed, 3-3-a first electric flow channel exchanger, 3-4-a second electric flow channel exchanger, 301-a gradually expanding rectifying cavity, 302-a reaction generating cavity, 303-an outlet converging cavity, 304-a sine wave type adsorption plate, 305-an electric rotor, 306-an external stator, 307-a direct flow channel, 308-a cross flow channel, 4-a forced liquid cooling system, 401-a steam condensation bin, 402-a filter, 403-a water receiving tank, 404-a fresh water collector, 405-a dry cold air outlet, 406-a first induced air fan, 407-a second induced air fan, 408-a convection cavity and 409-a heat exchange tube bundle, 410-baffling fins, 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 inlet of an air cooling unit and 5-a power supply system.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the present embodiment provides an integrated circulating water drying and taking device based on solar energy, which includes a solar heating system 1, a drying system 2, an alternative moisture absorption and desorption system 3, a forced liquid cooling system 4 and a power supply system 5, specifically:
the solar heating system 1 is a vacuum tube type solar heating system 1 and is composed of two sets of subsystems, namely a first heating system 1-1 and a second heating system 1-2.
In the embodiment, the first heating system 1-2 is formed by connecting two vacuum tube type solar heat collectors in series, an axial flow type induced air fan is installed at a hot air outlet, and the second heating system 1-2 continuously provides hot air for the drying system 2. In the embodiment, the first heat supply system 1-1 is formed by connecting three vacuum tube type solar heat collectors in series, and an axial flow induced air fan is also installed at the air outlet, the first heat supply system 1-1 can heat and desorb moisture adsorbed at the desorption side of the alternating moisture absorption desorption system 3, and send the desorbed wet and hot air into the liquid cooling forced system 4 for condensation and water taking.
In this embodiment, the main body of the evacuated tube solar collector comprises 7 evacuated collector tubes 101, a collecting chamber 102, a fixing bracket 104, a fixing tube 103, a flange 105 and an in-tube heat storage sleeve 106.
The inner diameter of the vacuum heat collecting tube 101 is 58mm, the length is 1.5m, and a heat storage sleeve 106 with the outer diameter of 50mm and the length of 1.4m is arranged in the vacuum heat collecting tube 101.
As shown in fig. 2, the heat storage kit 106 includes a copper pipe 107 and a sleeve 108 concentrically arranged inside and outside, and 6 t-shaped fins 109 are uniformly distributed on the outer wall surface of the sleeve 108; the sleeve 108 is provided with straight fins 110 on the inside. Specifically, during processing, a thread with the length of 10mm is turned at one end of a copper pipe 107 with the length of 1.5m, the outer diameter of 22mm and the wall thickness of 2mm, the copper pipe is inserted into a copper sleeve 108 with the length of 1.4m and the inner diameter of 38mm coaxially, the copper pipe 107 extends out 10cm from an outlet at the upper end of the sleeve 108, and the lower end of the sleeve 108 is flush with the copper pipe 107; two ends of the sleeve 108 are sealed by 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 welding, forming a threaded hole with the diameter of 5mm at the position, close to the edge, of the copper cover, and then injecting the low-temperature phase-change heat storage material in a molten state into the threaded hole; and after the phase-change material is injected, plugging by adopting a sealing plug. The heat transfer enhancing fins on the outside of the sleeve 108 and the inside of the copper tube 107 may be positioned by gas welding or direct casting. The T-shaped rib 109 on the outer side wall surface of the sleeve 108 is 5cm longer than the sleeve 108, the upper end of the T-shaped rib is flush with the sleeve 108, and the lower end of the T-shaped rib exceeds the part and is inserted into a positioning hole in the fixing pipe 103; the inner side of the copper pipe 107 is also provided with 6 straight plate type fins 110, and the enhanced heat transfer fins on the inner side and the outer side of the sleeve are all in one-to-one correspondence with equal radians around the axis.
As shown in fig. 3, the converging cavity 102 is a cylindrical shape, and is divided into an inner layer and an outer layer, which are made of aluminum alloy. One end of the inner cavity 112 is open, the other end is closed, the half section of the inner cavity passing through the axis is U-shaped, and 7 inner cavity threaded holes 113 are formed in the lower side of the inner cavity at equal intervals and 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 opened and are coaxially arranged at the end face of the flange 105 together with the inner cavity 112, the two ends and the end face of the flange 105 are welded by argon tungsten-arc welding, 7 vacuum tube connecting holes 114 with the diameter slightly larger than the outer diameter of the vacuum tube are arranged below the side of the outer cavity 111 and right face to the threaded hole 113 of the inner cavity, and a sealing silica gel pad is arranged.
When the vacuum tube heat collector is integrally assembled, the threaded ends of the 7 heat storage kits 106 penetrate through the vacuum tube connecting holes 114 of the outer cavity 111 and are screwed into the threaded holes 113 of the inner cavity; then, the evacuated collector tubes 101 are sequentially sleeved in the heat storage sleeve 106, the upper ends of the vacuum tubes are sequentially inserted 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 in the corresponding positioning holes of the fixed tube 103. The diameter of the central circular hole 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 shelf 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 projection of the side position of the drying box 201 is trapezoidal, and is made of aluminum alloy, the polystyrene foam board with excellent thermal insulation performance is tightly wrapped on the outer surface of the maintenance structure, and when the drying box 201 is installed and used, the shorter side of the drying box is installed towards the south. The sunny side of the upper end face 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 body, three layers of material trays 203 are arranged on a special material rack 202 at equal intervals, each layer of material tray 203 is formed by one-time punching of a stainless steel plate with the thickness of 1mm, and the side faces of the trays facing to the north side direction of the box body are provided with push-pull handles. A water collecting groove 207 with a slight inclination angle is arranged at one side of the material frame 202 close to the south and is used for collecting liquid drops condensed at the glass cover plate 206; the outlet of the water collecting groove 207 is connected with a fresh water collecting bottle 208 through a special tubule, and liquid drops dropping into the water collecting groove 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 a north side of the drying cabinet 201.
A plurality of dense vent holes are uniformly arranged on the bottom plate of the material tray 203 according to the appearance shape and size distribution of the main dry material. In the operation 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 around the vent hole by a molding press.
As shown in fig. 5, the air guide 204 is mainly composed of a rectification grid 209, an air inlet homogenizer 210 and an air inlet pipe 211, and is installed at the bottom of the drying box 201, and the outlet of the rectification grid 209 faces the material tray 203. The air inlet homogenizer 210 is a gradually expanding hot air channel, in order to ensure that hot air flows into the rectification grid 209 uniformly, a plurality of uniform flow air guide fins 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 alternative moisture absorption and desorption system 3 includes a first adsorption bed 3-1, a second adsorption bed 3-2, a first electric flow channel exchanger 3-3, and a second electric flow channel exchanger 3-4, which are arranged side by side, and the inlet and outlet of the two adsorption beds are connected to the corresponding electric flow channel exchanger interfaces through pipes, and the interfaces are connected by threads. The inlet ends of the first adsorption bed 3-1 and the second adsorption bed 3-2 are respectively connected with the humid air outlet 205 and the air outlet of the first heat supply system 1-1 through a first electric flow channel 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 heat supply system 1-2 through a second electric flow channel exchanger 3-4 in a mode of continuously switching communication ports.
As shown in FIG. 7, the adsorption bed is composed of a divergent rectification chamber 301, a reaction generation chamber 302 and an outlet confluent chamber 303. According to the structure and the size of the cavity, a special multi-channel gradually-expanding rectifying grid is arranged in the gradually-expanding rectifying cavity 301, and the grid is made of an aluminum alloy material; the outlet end of the divergent 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 diameter of the fiber is about 30 mu m, the mass of water absorbed in about 15 seconds is 70-100 times of the mass of the adsorption plate, the Limiting Oxygen Index (LOI) is 10, and the adsorption plate has good flame retardance; the outlet end of the reaction generating cavity 302 is connected with an outlet converging cavity 303, the overall appearance of the reaction generating cavity is a quadrangular pyramid, and the cavity maintenance structure material is preferably aluminum alloy.
As shown in fig. 8, the electric flow channel exchanger includes an electric rotor 305 and an outer stator 306. The electric rotor 305 is cylindrical, and has two direct current flow paths 307 and two cross flow paths 308, each having the same diameter. The central lines of the two direct current flow channels 307 are distributed in axial symmetry with respect to the central line of the rotor, the central lines of the two crossed flow channels 308 are distributed in central symmetry with respect to the central line of the rotor, and the circular interfaces corresponding to the two end surfaces of each flow channel are distributed in the form of equal radius and equal radian around the center of a circle of the end surface. One end of the rotor close to the adsorption bed is called an inner end face, the other end of the rotor is called an outer end face, and a circular hole capable of being provided with a flat key is formed in the circle 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 molecular material. The outer stator 306 is in the form of a sleeve with a flange that is threadably engaged with the sleeve. Two threaded holes with the same diameter as the diameter of the flow channel of the electric rotor 305 are formed in the inner end face and the outer end face of the outer stator 306 and used for connecting a pipeline, the two threaded holes are symmetrical about the center of the circle of the end face, the center distance of the threads is the same as the center distance of the circular hole in the end face of the inner flow channel, and smooth airflow channels can be accurately formed between the rotor flow channel and the corresponding threaded holes. A circular hole is formed in the circle center of the outer end face of the stator, a roller bearing is embedded in the circular 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 dual-effect cooling type 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 for carrying the units.
As shown in fig. 10, the steam condensing unit is connected to the air outlet of the alternating moisture absorption and desorption system 3, the steam condensing unit includes a high-temperature hot air inlet 418 and a steam condensing bin 401, a filter 402 is disposed in the steam condensing bin 401, a water receiving tank 403 is disposed below the filter 402, and a fresh water collector 404 is disposed below the water receiving tank 403; a dry cold air outlet 405 positioned above the filter 402 is arranged on the wall of the steam condensation bin 401, and the dry 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 atmospheric environment.
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 gradually expanded, the lower end of the pipeline is connected with the steam condensation bin 401, the outlet of the pipeline 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, and the five layers of flat ceramic membranes are arranged in a clamping groove arranged in the box body in parallel; a dry cold air outlet 405 is slightly higher than the filter 402, and a flat-plate type hydrophobic ceramic membrane is arranged at the outlet; the water receiving tank 403 is located below the filter 402, and is of an inverted triangle shape as a whole, and the bottom of the water receiving tank is connected with a fresh water collector 404. The dry cold air outlet 405 is respectively connected to the 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; a 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 atmospheric environment.
The shell-and-tube air cooling unit comprises a convection cavity 408, an air inlet 419 of the air cooling unit is arranged on one side above the convection cavity 408, a heat exchange tube bundle 409 and vertically arranged baffling fins 410 are arranged in the convection cavity 408, and the baffling fins 410 are provided with a plurality of blocks and are respectively and alternately connected with the top and the bottom of the convection cavity 408; said heat exchange tube bundle 409 extends to said steam condensing unit; an air cooling unit air outlet is formed in the other side of the upper portion of the convection cavity 408 and connected to an 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 divergent and is arranged at the top of the convection cavity 408, and the air inlet is over against the leftmost side of the heat exchange tube bundle 409; the baffle fins 410 are five in total, the front-back length of each fin is the same as the front-back width of the box body, the up-down width of each fin is slightly smaller than the height of the convection cavity 408, the fins are respectively installed in clamping grooves designated by the top and bottom positions of the convection cavity 408 in an up-down alternating manner, three fins are arranged at the top position, two fins are arranged at the bottom position, the fins are made of aluminum alloy materials, the distance between every two adjacent fins is about 10cm, after the fins are installed, 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 penetrate through the left side wall surface of the box body, the baffle fins 410, a middle baffle plate in the box body and the right side wall surface of the box body, so that a neat positioning hole bundle is formed, and the diameter of each positioning hole is 17 mm; the heat exchange tube bundle 409 consists of 11 copper heat exchange tubes, the length of the heat exchange tube bundle is the same as the left-right length of the box body, and the wall thickness of the heat exchange tube bundle is 1 mm; before the heat dissipation unit is installed, 11 heat exchange tubes are respectively inserted into positioning holes in the right side wall surface of the box body and penetrate through positioning holes in the middle partition plate, then two end surfaces of each copper tube 107 in the tube bundle are flush with the left wall and the right wall of the box body, and the joints of the end surfaces are welded and fixed and uniformly coated with high-temperature-resistant waterproof materials; the air outlet is located at the right side position 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 circulating 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 this embodiment, the switching bin 411 is arranged at the top of the left side wall surface of the box body, 11 positioning holes are completely covered by the mounting hole on the right side end surface of the switching bin 411, 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 an opening and is detachably connected to a water inlet of the circulating water tank 413 through a pipeline; the circulating water tank 413 is positioned at the lower left of the tank body, an outlet is detachably connected to the axial inlet end of the 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, the maximum lift is 10m, and the circulating pump 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 the 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 on 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 the low-temperature environment in winter, the circulating cooling liquid used by the system can be selected as an antifreezing solution.
As shown in fig. 11, the semiconductor cooling unit includes a cooler 415, a semiconductor cooling plate 416, and a heat sink 417, and an air outlet of the semiconductor cooling unit is connected to the first induced air 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 heat sink 417 are both made of 6063 aluminum, which has a length of 150mm, a width of 100mm, a height of 36mm, a tooth thickness of 0.8mm, a tooth space of 2.93mm, and a bottom thickness of 2 mm; the external dimension of the semiconductor refrigeration piece 416 is 130mm multiplied by 80mm multiplied by 3.6mm, the rated voltage is 12V, the maximum working current is 10A, and the maximum power is 120W; the external dimension of the induced air duct is 150mm multiplied by 100mm multiplied by 39mm, the wall thickness is 1.5mm, the material is aluminum alloy, and the side surface is provided with an installation hole with the dimension of 130mm multiplied by 80mm by a laser cutting machine; the air outlet is connected with a gradually expanding air collecting pipeline, and the connection part is welded by argon arc welding; when the semiconductor refrigerating sheet is installed, the heat-conducting silica gel is uniformly coated on the contact surface of the cooler 415 and the radiator 417, the heat-conducting silica gel is respectively adhered to the cooling side and the radiating side of the semiconductor refrigerating sheet 416, the toothed sheets of the cooler 415 are installed in the vertical direction, the toothed sheets of the radiator 417 are installed in the front-back direction, and then the heat-conducting silica gel is dried by hot air. After drying, extending the heat dissipation side of the bonded liquid cooling module into the air guide duct mounting hole, and welding the 417 tooth end face of the heat radiator with argon arc welding at the contact line when the end face of the heat radiator is fully attached to the end face of the air guide duct mounting hole; after the installation 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 also 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 coated on the welding position to prevent leakage; in order to avoid the falling-off phenomenon caused by the fact that the contact surfaces are not firmly connected, after the semiconductor heat dissipation unit is installed, a right-angle bracket is additionally arranged at the bottom of the semiconductor heat dissipation unit, the upper end of the bracket is in close contact with the heat dissipation unit, and the left end of the bracket is fixed on 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 method for integrated circulation drying water taking based on solar energy comprises the following steps:
s1: cold air is heated by the first heat supply system 1-1 and the second heat supply system 1-2;
s2: the high-temperature dry air flowing out of the second heating system 1-2 dries the 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 glass cover plate at the top of the drying system 2 and flows into the fresh water collecting 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 by the alternating moisture absorption and desorption system 3, and the dehumidified air enters the second heat supply system 1-2 again to complete 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 moisture absorption saturation state, the original moisture absorption side is rapidly switched to the new desorption side, and the original desorption side is rapidly switched to the new moisture absorption side, so that continuous rapid switching and synchronous operation of a moisture absorption process and a desorption process are realized, and then high-temperature dry air in the first heat supply system 1-1 enters the new desorption side of the alternating moisture absorption and desorption system 3, and dehumidification and water taking are performed on the new desorption side of the alternating moisture absorption and desorption system 3;
s5: the humid air flow with higher temperature generated in the step S4 flows into the forced liquid cooling system 4, and forms fresh water after being condensed in the forced liquid cooling system 4; the condensed and dehumidified dry cold air enters the air inlet of the first heat supply system 1-2 again to start the next circulation; when the wind pressure in the first heating system 1-1 is too high, the redundant dry cold air will be automatically discharged into the atmosphere.
Specifically, the method comprises the following steps:
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 below the side of the inner cavity 112, and the low-temperature phase change heat storage material performs primary preheating on the inflowing normal temperature air through the wall of the copper pipe 107 and the straight plate type reinforced heat exchange fins inside the copper pipe 107; the preheated airflow flows in a 180-degree direction at the bottom of the copper pipe 107 and then flows out of the evacuated collector tube 101 along the outer side of the sleeve 108, in the process, the airflow directly sweeps the inner wall of the evacuated collector tube 101 outwards, after absorbing a large amount of radiant heat, the temperature is quickly raised to exceed 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 fins 109; the hot air flowing out from each vacuum heat collecting pipe converges in the outer cavity 111 and flows into the next stage heat collector through the central hole of the flange 105 to be heated. To reduce the heat loss of the hot gas flow in the outer cavity 111, an insulating layer is disposed on the outer surface of the outer cavity 111. When the device is operated at night, the low-temperature phase-change heat storage material in the heat storage kit 106 begins to release heat outwards, thereby providing operating energy for the system.
The drying method of the double-effect hybrid drying system 2 comprises the following steps:
convection drying in the drying system 2 is the first effect, and the principle is that: the high-temperature dry air flowing out of the second heating system 1-2 firstly enters the air inlet homogenizer 210 from the air inlet below the drying box 201, uniformly flows into the rectification grid 209 under the uniform flow action of the air guider 204, and the high-temperature dry air rectified by the rectification grid 209 is uniformly subjected to direct convection drying on the drying material through the vent holes on the three-layer material tray 203; in the process, moisture contained in the dry material continuously penetrates through the skin and is mixed with high-temperature air to form wet air, and finally the wet air flows out from a wet air outlet 205 above the back plate of the box body. The second effect is radiation type drying, and the sunlight shines through glass apron 206 and directly dries the material with stifling mode of shining, has further promoted the inside temperature of drying cabinet 201, has accelerated the evaporation rate of the inside moisture of dry material. Most of the water vapor generated inside the box body is mixed with the hot air in a sufficient convection way to form wet air, and the wet air flows out from the wet 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, then rolls down to the water collecting groove 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 starting the system, 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 firstly enters one of the adsorption beds (original adsorption bed) through the first electric flow channel exchanger 3-3, and the wet air uniformly flows into the reaction generating cavity 302 under the rectification action of the gradually expanding rectification cavity 301; because the cavity and the grid are in a gradually expanding type, the generated local loss is very small; after the wet air enters the reaction generating cavity 302, under the guiding and disturbing action of the sine wave type adsorption plate 304, a thermal boundary layer and a velocity boundary layer formed by the wet air flow on the surface of the adsorption plate 304 are damaged, so that the wet air can be fully contacted with the surface of the adsorption plate 304, the moisture carried in the wet air is 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 wet air flowing out of the drying box; the dehumidified dry air is collected in the outlet manifold 303, and then flows into the second heating system 1-2 through the second electric flow channel exchanger 3-4, and then the next drying-dehumidifying cycle is started. When the adsorption plate 304 reaches a water absorption saturation state, the electric flow channel exchanger automatically switches the airflow channel to the cross flow channel 308, that is, the original adsorption side is switched to a new desorption side, and the other adsorption bed is switched to a new adsorption side. High-temperature dry air from the first heat supply system 1-2 flows into the adsorption bed at the new desorption side through the first electric flow channel exchanger 3-3, and because the first heat supply system 1-1 has one more heat collector than the second heat supply system 1-2, 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; the high-temperature dry air is fully contacted with the adsorption plate at the new desorption side, the adsorption plate is heated, the adsorbed moisture is rapidly evaporated, and the high-temperature dry air is further mixed with the dry air to form wet air flow; the higher temperature humid air stream flows into the forced liquid cooling system 4 through the second electrically powered flow channel exchanger 3-4 at the outlet end. After that, the adsorption process and the desorption process are carried out synchronously, 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 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. High-temperature wet air flowing out of the desorption side of the alternating moisture absorption desorption system firstly flows into a steam condensation bin 401 through a high-temperature wet air inlet pipeline above the box body, and then carries out convective heat transfer with circulating cooling liquid in a heat exchange tube bundle 409 through a tube wall, so that water vapor in air flow is condensed and liquid drops are formed; the liquid droplets drop into the filter 402 under the action of gravity, and the filter 402 can effectively intercept the trace impurities and fine particles in the gas flow; the 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 draft fan 406 through the outlet, then flows into an air inlet of the first heating system 1-1, and starts the next circulation; the flat-plate 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 the flat-plate hydrophobic ceramic membrane, and the water production efficiency of the system is further improved; when the air pressure in the first heating system 1-1 is too high, the redundant dry cold air is discharged into the atmosphere environment through the second induced air fan 407 under the control of the electric three-way valve.
After the semiconductor chilling plate 416 is connected with direct current, the semiconductor chilling plate 416 absorbs heat in the circulating cooling liquid through the cooler 415 on the left side of the semiconductor chilling plate 416, and then first-effect cooling is performed on the cooling liquid; under the suction action of the first induced draft fan 406, normal temperature air in the atmospheric environment respectively flows into the air duct at the heat dissipation side and the air inlet of the air cooling unit above the box body, and in the air duct, the cold air and the forced heat exchange fins and the tube wall in the heat radiator 417 generate convective heat exchange, so as to take away the heat production of the refrigeration fins; 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 baffling fins 410, so as to realize second-effect cooling, and then converges with the air flowing out of the semiconductor cooling unit, and finally flows into the air inlet of the first heat supply system 1-1.
It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. The utility model provides an integral type circulation drying water intake device based on solar energy, its characterized in that includes solar energy heating system, drying system, alternate moisture absorption desorption system, forces liquid cooling system and power supply system, specific:
the solar heat supply system, the drying system and the moisture absorption sides of the alternative 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.
2. The integrated solar-based circulating drying water taking device according to claim 1, wherein the solar heating system comprises a first heating system and a second heating system, and an air outlet of the second heating system is connected with an air inlet of the drying system and is used for continuously providing hot air for the drying system; the air outlet of the first heat supply system is connected with the desorption side inlet of the alternative moisture absorption desorption system and is used for dehumidifying and desorbing the desorption side of the alternative moisture absorption desorption system;
the moisture absorption side of the alternating moisture absorption and desorption system is connected with the second heat supply system and the drying system and is used for dehumidifying the humid air exhausted by the drying system and conveying the dehumidified air to an air inlet of the second heat supply system; the desorption side of the alternating moisture absorption desorption system is also connected with the first heat supply system, and the first heat supply system is used for dehumidifying and desorbing the desorption side of the alternating moisture absorption desorption system;
the forced liquid cooling system inlet is connected with the desorption side outlet of the alternative moisture absorption desorption system, the first heat supply system air inlet is connected with the forced liquid cooling system outlet, the forced liquid cooling system is used for cooling high-temperature wet air to form fresh water, and the dry cold air after condensation and dehydration is conveyed to the first heat supply system air inlet.
3. The solar-energy-based integrated circulating water drying and taking device as claimed in claim 2, wherein the first heat supply system and the second heat supply system are both composed of evacuated tube solar collectors, each evacuated tube solar collector comprises an evacuated tube collector, a heat storage sleeve is arranged in each evacuated tube collector, the upper part of each evacuated tube collector is communicated with the confluence cavity, and the device further comprises a fixing tube and a fixing support for fixing;
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.
4. The solar-based integrated circulating drying water taking device is characterized in that the drying system comprises a drying box and a material rack, and 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 on 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 positioned below the higher side of the glass cover plate, and a wet air outlet is arranged below the higher side of the glass cover plate and communicated with the moisture absorption side of the alternating moisture absorption and desorption system.
5. The solar-based integrated circulating drying water taking device is characterized in that an air guide device is arranged below the material rack and connected with an air outlet of the second heating system.
6. The integrated solar-based cyclic drying water intake device according to claim 2, wherein the alternating moisture absorption and desorption system comprises a first adsorption bed, a second adsorption bed, a first electric flow channel exchanger and a second electric flow channel exchanger, and the inlet ends of the first adsorption bed and the second adsorption bed are respectively connected with the humid air outlet and the first heat supply system air outlet through the first electric flow channel 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 heat supply system through a second electric flow channel exchanger.
7. The solar-based integrated circulating water drying and taking device according to claim 2, wherein the forced liquid cooling system comprises a steam condensing unit, a shell-and-tube air cooling unit, a cooling liquid circulating driving unit and a semiconductor cooling unit.
8. The solar-based integrated circulating drying water taking device as claimed in claim 7, wherein the air inlet of the steam condensation unit is connected with the air outlet at the desorption side of the alternating moisture absorption and desorption system, and the air outlet of the steam condensation unit is also connected with the air inlet of the first heat supply system;
or, the shell-and-tube air-cooled heat dissipation unit comprises a convection cavity, and a heat exchange tube bundle and vertically arranged baffling fins 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 circulating drive 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 circulating water tank, and the circulating water tank is communicated with the semiconductor cooling bin through a circulating pump;
or the semiconductor cooling unit comprises a cooler, a semiconductor refrigerating sheet and a radiator which are sequentially connected, and an air outlet of the semiconductor cooling unit is connected with the first induced draft fan through a pipeline.
9. An integrated solar-based circulating drying water taking method, which is characterized in that the integrated solar-based circulating drying water taking device according to any one of claims 2-8 is used, and 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 heat supply system dries the 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 alternative moisture absorption and desorption system, the wet air is dehumidified by the alternative moisture absorption and desorption system, and the dehumidified air reenters the second heat supply system to complete the next drying and dehydrating cycle;
s4: when the moisture absorption side of the alternative moisture absorption and desorption system in the step S3 reaches a moisture absorption saturation state, the original moisture absorption side is rapidly switched to a new desorption side, the original desorption side is rapidly switched to a new moisture absorption side, continuous rapid switching and synchronous operation of a moisture absorption process and a desorption process are realized, high-temperature dry air in the first heat supply system enters the new desorption side of the alternative moisture absorption and desorption system, and dehumidification and water taking are performed on the new desorption side of the alternative moisture absorption and desorption system;
s5: the humid air with higher temperature generated in the step S4 flows into the forced liquid cooling system and is condensed in the forced liquid cooling system to form fresh water; the condensed and dehumidified dry cold air enters the air inlet of the first heat supply system again to start the next circulation; when the wind pressure in the first heating system is too high, the redundant dry cold air is automatically discharged into the atmospheric environment.
10. The integrated solar-based cyclic drying water intaking method according to claim 9, wherein the first and second heating systems are each composed of vacuum tube type solar collectors, and the number of vacuum tube type solar collectors in the first heating system is greater than the number of vacuum tube type solar collectors in the second heating system.
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