CN114590860B - Air circulation high-salt wastewater desalination treatment system - Google Patents
Air circulation high-salt wastewater desalination treatment system Download PDFInfo
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- CN114590860B CN114590860B CN202210372371.7A CN202210372371A CN114590860B CN 114590860 B CN114590860 B CN 114590860B CN 202210372371 A CN202210372371 A CN 202210372371A CN 114590860 B CN114590860 B CN 114590860B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/14—Treatment of water, waste water, or sewage by heating by distillation or evaporation using solar energy
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
Abstract
The invention discloses an air circulation high-salt wastewater desalination treatment system which comprises a solar integrated heat collection-evaporator and an air heat regenerator, wherein a water cooling cooler, a waste liquid supplementing tank, a condensed water recycling tank, an air pump, a bubbler and a butterfly type air valve.
Description
Technical Field
The invention relates to a high-salt wastewater desalination treatment system.
Background
With the gradual progress of industrialization, the problem of water pollution, especially industrial wastewater pollution, is increasingly remarkable. The high-salt wastewater is taken as an important component of industrial wastewater, and widely exists in various chemical production processes, including coal chemical industry, dye production, pesticide production and the like. Because the high-salt wastewater has a salt content higher than 1%, the high-salt content becomes inhibin and poisoning agent of microorganisms, and the difficulty of biological treatment is greatly increased, so that the biological treatment technology widely used in the conventional wastewater treatment can not effectively treat the wastewater.
The evaporation treatment technology is widely applied to the field of water treatment due to the characteristics of wide application range, no limitation of wastewater concentration and the like. Current wastewater evaporation treatment systems include multiple effect distillation (MEE) systems, mechanical Vapor Recompression (MVR) systems, humidification-dehumidification (HDH) systems, and the like. The multi-effect distillation system relies on steam as a heat supply source, so that the energy consumption is high, the primary energy consumption is huge, besides, the equipment of the system is huge, the pipeline system is complex, the equipment and maintenance cost is extremely high, and the scaling condition of the final-stage evaporation device is serious. While mechanical vapor recompression systems, although having reduced energy consumption compared to multi-effect distillation systems, consume instead higher grade electrical energy, and therefore the primary energy consumption of the system is not reduced. Humidification-dehumidification systems have greater energy flexibility than the former two, often using low grade waste heat or solar energy as the driving heat source, which greatly reduces the system's consumption of non-renewable energy sources. However, the existing humidification-dehumidification system adopts a humidification tower which is separated from an energy input device, the evaporation process carries out mass transfer by means of the convection process of fluid, and certain heat loss exists in the flow process, and the whole heat absorbed by the working medium of the system can not be fully utilized, so that the energy utilization rate of the existing humidification-dehumidification system is lower.
Disclosure of Invention
The invention aims to: aiming at the prior art, the air circulation high-salt wastewater desalination treatment system is provided, and the problem of low energy utilization rate existing in the existing evaporation separation technology is solved.
The technical scheme is as follows: an air circulation high-salt wastewater desalination treatment system, comprising: the solar energy integrated heat collection-evaporator, an air heat regenerator, a water cooling cooler, a waste liquid supplementing tank, a condensed water recovery tank, an air pump, a bubbler and a butterfly type air valve;
the air outlet of the air pump is connected to the bubbler, the air outlet of the bubbler is positioned at the bottom of the solar integrated heat collection-evaporator, the air outlet at the top of the solar integrated heat collection-evaporator is connected to the hot end inlet of the air heat regenerator through a butterfly air valve, the hot end outlet of the air heat regenerator is connected with the air inlet of the water cooling cooler, the air outlet of the water cooling cooler is connected with the cold end inlet of the air heat regenerator, and the cold end outlet of the air heat regenerator is connected with the air inlet of the air pump;
the cooling water inlet and the cooling water outlet of the water cooling cooler are connected to the condensed water recovery tank; the bottom of the air heat regenerator is provided with a first water receiving disc, the bottom of the water cooling cooler is provided with a second water receiving disc, and water outlets of the first water receiving disc and the second water receiving disc are connected to the condensate water recovery tank;
and the solar integrated heat collection-evaporator is also provided with a waste water inlet, and the waste liquid replenishing tank is connected with the waste water inlet.
Further, the solar integrated heat collection-evaporator comprises a double-layer glass cover plate, a heat collection plate, sieve pore ribs, a heat preservation backboard and a box body; the box body is of an open slot structure, the double-layer glass cover plate is connected to the opening of the box body, the heat collecting plate is arranged in the box body and is parallel to the double-layer glass cover plate, the sieve pore ribs are connected to the back of the heat collecting plate at intervals along the length direction of the heat collecting plate, and the heat preservation backboard is arranged on the bottom surface of the box body; the solar integrated heat collection-evaporator is obliquely arranged, and the wastewater inlet is positioned at the upper part of the bottom surface of the box body; the air outlet of the bubbler is inserted from the air inlet at the bottom of the solar integrated heat collection-evaporator and is fixed between the tail end of the heat collection plate and the bottom surface of the box body.
Further, a concentrated wastewater recovery port is further arranged at the lower part of the bottom surface of the box body of the solar integrated heat collection-evaporator, and the concentrated wastewater recovery port is connected with a concentrated wastewater recovery tank; in order to ensure the relative balance of the liquid level of the wastewater in the solar integrated heat collection-evaporator, high-concentration wastewater is discharged through the concentrated wastewater recovery port and enters the concentrated wastewater recovery tank for recovery and storage; the flow rate of the wastewater discharged from the concentrated wastewater recovery portm w 109 The flow rate of the wastewater to be treated which needs to flow in from the wastewater inlet through the wastewater replenishing tankm w 102 Concentration ofc 0 Concentration of stored wastewater in the solar integrated heat collection-evaporatorc 1 To maintain the relative balance of the wastewater level in the solar integrated heat collection-evaporator, the specific control relationship is as follows:m w 109 =m w 102 (c 0 /c 1 )。
furthermore, the heat collecting plate is made of a metal plate with a black heat conducting coating on the surface, and the mesh ribs are welded with the back of the heat collecting plate.
Further, the solar integrated heat collection-evaporator comprises a vacuum tube and a reflection condensing plate; the bottom end of the vacuum tube which is obliquely arranged is closed, a plurality of bubbling regeneration plates are arranged in the vacuum tube from bottom to top at intervals, through holes are densely distributed on the bubbling regeneration plates, and the diameter of the through hole at the upper half part is smaller than that of the through hole at the lower half part; the bubbler is inserted from the top opening of the vacuum tube and passes through each bubbling regeneration plate; the reflection condensing plate is arranged on the back of the vacuum tube, and the reflection focusing focus is positioned on the vacuum tube.
Further, the outlet of the waste liquid supplementing tank is connected to the top opening of the vacuum tube through a pipeline.
The beneficial effects are that: in the air circulation high-salt wastewater desalination treatment system, air is sucked by an air pump and then enters a bubbler to form a large number of air bubbles and enters a solar integrated heat collection-evaporator; in the solar integrated heat collection-evaporator, air bubbles are in direct contact with waste water, the air gradually absorbs moisture in the waste water by means of absorbed solar radiation heat in an evaporation mode, the temperature of the air is continuously increased along with heat exchange with the waste water, so that the capacity of the air to contain the moisture is improved, and finally, high-temperature and high-humidity air subjected to evaporation separation is discharged through an outlet at the top of the solar integrated heat collection-evaporator; the high-temperature and high-humidity air at the outlet of the solar integrated heat collection-evaporator exchanges heat with the low-temperature and low-humidity air at the outlet of the cooler through the hot end of the air regenerator, a part of heat is recovered, the air is cooled, and partial desalted condensate water is condensed and separated out to become medium-temperature and high-humidity air, and the desalted condensate water is recycled through a water receiving disc at the bottom of the air regenerator; the medium-temperature high-humidity air enters a cooler again to be cooled and condensed, the moisture in the air is removed, and the rest desalted condensate water is recovered; finally, the low-temperature low-humidity air enters the hot end of the air heat regenerator again for heat regeneration and temperature rise, and then enters the air pump again to complete the next wastewater evaporation, desalination and separation cycle.
Compared with the existing high-salt wastewater treatment system, the invention has the following beneficial effects: (1) The system adopts solar energy as a heat supply source, and power consumption components of the system only comprise an air pump, so that the dependence of the wastewater treatment process on high-grade electric energy is greatly reduced, and the consumption of fossil energy is reduced; (2) The system has low requirements on the types and the concentrations of the high-salt wastewater, and can treat the salt-based solution wastewater with various components and concentrations; (3) The system adopts air circulation to treat high-salt wastewater, basically only moisture can enter the circulating air in the evaporation process, the air is not in direct contact with the external environment, the treatment process is clean and reliable, the purity of the desalted condensate water is high, and the condensate water can be basically completely recycled; (4) The system adopts a solar integrated heat collection-evaporator, integrates a heat collection device and a wastewater evaporation device, directly uses solar radiation heat in the wastewater evaporation process, reduces energy loss, improves the wastewater evaporation efficiency, and simultaneously reduces the manufacturing cost of the whole system; (5) The system adopts an air heat regenerator combined with the integral circulation of the solar integrated heat collection-evaporator, so that the integral energy utilization rate and the capacity ratio of the system are further improved; thermodynamically, when the regenerative efficiency of the air regenerator is 80%, the energy utilization rate of the system can reach 94%.
Drawings
Fig. 1 is a schematic diagram of a system structure of embodiment 1;
fig. 2 is a schematic structural view of a solar integrated heat collecting-evaporating apparatus in embodiment 1;
fig. 3 is a schematic structural view of a solar integrated heat collecting-evaporating apparatus in embodiment 2;
FIG. 4 is a schematic view showing the internal structure of the vacuum tube in example 2;
fig. 5 is a schematic structural diagram of a bubbling regeneration plate in example 2.
Description of the embodiments
The invention is further explained below with reference to the drawings.
Examples
As shown in fig. 1, an air circulation high-salt wastewater desalination treatment system includes: the solar heat collection-evaporator comprises a solar integrated heat collection-evaporator 1, an air heat regenerator 2, a water-cooling cooler 3, a waste liquid supplementing tank 4, a concentrated waste liquid recovery tank 5, a condensed water recovery tank 6, an air pump 7, a bubbler 8 and a butterfly valve 9.
The air outlet of the air pump 7 is connected to the bubbler 8, and the air outlet of the bubbler 8 is positioned at the bottom of the solar integrated heat collection-evaporator 1; the air outlet 101 at the top of the solar integrated heat collection-evaporator 1 is connected to the hot end inlet 201 of the air heat regenerator 2 through a butterfly type air valve 9, the hot end outlet 202 of the air heat regenerator 2 is connected with the air inlet 301 of the water-cooling cooler 3, the air outlet 302 of the water-cooling cooler 3 is connected with the cold end inlet 203 of the air heat regenerator 2, and the cold end outlet 204 of the air heat regenerator 2 is connected with the air inlet of the air pump 7.
The cooling water inlet 303 and the cooling water outlet 304 of the water-cooled chiller 3 are both connected to the condensate recovery tank 6. The bottom of the air heat regenerator 2 is provided with a first water receiving disc 205, the bottom of the water cooling cooler 3 is provided with a second water receiving disc 305, and water outlets of the first water receiving disc 205 and the second water receiving disc 305 are connected to the condensate recovery tank 6.
The solar integrated heat collection-evaporator 1 is also provided with a waste water inlet 102, and the waste liquid supplementing tank 4 is connected with the waste water inlet 102. The lower part of the bottom surface of the box body 107 of the solar integrated heat collection-evaporator 1 is also provided with a concentrated wastewater recovery port 109, and the concentrated wastewater recovery port 109 is connected with the concentrated wastewater recovery tank 5.
As shown in fig. 2, the solar integrated heat collecting-evaporating device 1 includes a double-glazing cover plate 103, a heat collecting plate 104, mesh ribs 105, a heat-insulating back plate 106, and a case 107. The box 107 is of an open slot structure, the double-layer glass cover plate 103 is connected to the opening of the box 107, and the heat collecting plate 104 is arranged in the box 107 and parallel to the double-layer glass cover plate 103. The heat collecting plate 104 is made of a metal plate with a black heat conducting coating on the surface, a plurality of sieve pore ribs 105 are connected to the back surface of the heat collecting plate 104 at intervals along the length direction of the heat collecting plate 104, and the sieve pore ribs 105 are welded to the back surface of the heat collecting plate 104; the heat-insulating back plate 106 is arranged on the bottom surface of the box body 107. The solar integrated heat collection-evaporator 1 is obliquely arranged, and the waste water inlet 102 is positioned at the upper part of the bottom surface of the box body 107; the air outlet of the bubbler 8 is inserted from an air inlet 108 at the bottom of the solar integrated heat collecting-evaporating device 1 and is fixed between the end of the heat collecting plate 104 and the bottom surface of the case 107.
The system takes solar energy as a heat supply source, utilizes the characteristic of different capacities of carrying moisture at different temperatures of wet air, evaporates and absorbs moisture in wastewater at a high air temperature, condenses and separates the moisture in air at a low air temperature, and finally realizes the evaporation separation and desalination treatment of high-salt wastewater. The system comprises four flow paths: an air circulation flow path, a wastewater flow path, a condensed water flow path, and a cooling water flow path.
In the air circulation flow path: the wet air flows through the bubbler 8, the solar integrated heat collection-evaporator 1, the butterfly type air valve 9, the air heat regenerator 2, the water cooling device 3 and the air heat regenerator 2 in sequence after being pressurized by the air pump 7, and then enters the air pump 7 again to form circulation.
The air is sucked by the air pump 7, and then enters the bubbler 8 through the air inlet 108 at the bottom of the solar integrated heat collection-evaporator 1, and a large amount of air bubbles are formed; in the solar integrated heat collection-evaporator 1, air bubbles are in direct contact with wastewater, a heat and mass transfer process of two-phase flow is carried out, the gas-liquid two phases absorb solar radiation heat, air gradually evaporates and absorbs water in the wastewater by taking the difference between the partial pressure of water vapor on the surface of the wastewater and the partial pressure of water vapor of the air as a driving potential, and meanwhile, the temperature of the air bubbles is continuously increased by heat exchange with the wastewater, so that the maximum water containing capacity of the air bubbles is improved; finally, the high-temperature and high-humidity air which is evaporated and separated is discharged through an air outlet 101 at the top of the solar integrated heat collection-evaporator 1 and passes through a butterfly type air valve 9; subsequently, high-temperature and high-humidity air enters through the hot end inlet 201 of the air regenerator 2 and exchanges heat with low-temperature and low-humidity air output by the air outlet 302 of the water-cooling cooler 3, a part of heat is recovered, sensible heat of air heating and latent heat of wastewater evaporation are included, the air is cooled, and part of desalted condensate water is condensed and separated out to become medium-temperature and high-humidity air; the desalted condensed water is discharged through a water receiving disc 205 at the bottom of the air heat regenerator 2 and recycled; the medium-temperature high-humidity air enters through the air inlet 301 of the water-cooling cooler 3, is cooled, condensed and removes water in the residual air, and is discharged and recycled through the water receiving disc 305 at the bottom of the cooler; finally, the low-temperature low-humidity air enters the cold end inlet 203 of the air regenerator 2 again, and enters the air pump 7 again through the cold end outlet 204 of the air regenerator 2 after the temperature is raised after the heat is regenerated, so that the next wastewater evaporation, desalination and separation cycle is performed.
In the waste water flow path: the waste water in the waste liquid supplementing tank 4 enters the solar integrated heat collecting-evaporating device 1 from the waste water inlet 102 and is mixed with the internal high-concentration waste water; in order to ensure the relative balance of the waste water liquid level in the solar integrated heat collection-evaporator 1, a small amount of high-concentration waste water is discharged through the concentrated waste water recovery port 109 of the solar integrated heat collection-evaporator 1 and enters the concentrated waste water recovery tank 5 for recovery and storage. In order to ensure that the liquid level in the solar integrated heat collection-evaporator 1 is unchanged, the flow rate of the wastewater discharged from the concentrated wastewater recovery port 109 is determined by feedback of the flow rate and concentration of the wastewater to be treated flowing from the wastewater inlet 102 of the wastewater replenishing tank 4 and the concentration of the wastewater stored in the solar integrated heat collection-evaporator 1 under practical conditions, specifically, the flow rate of the wastewater to be treated flowing from the wastewater inlet 102 of the wastewater replenishing tank 4m w 102 Concentration and concentration ofc 0 Flow rate of high-concentration wastewater discharged from concentrated wastewater recovery port 109 with solar integrated heat collection-evaporator 1m w 109 Concentration and concentration ofc 1 The mathematical relationship should be satisfied:m w 109 =m w 102 (c 0 /c 1 ). In the case that the conventional waste water to be treated is 5% in concentration and the discharged waste water is 25% in concentration, the flow rate of the discharged concentrated waste water is only 20% of that of the waste water to be treated, which means that 80% of the waste water is recovered through the system, so that the system has good desalination efficiency.
A condensed water flow path: the desalted condensed water is high-temperature and high-humidity air output by an air outlet 101 of the solar integrated heat collection-evaporator 1, and is obtained by condensing and separating out after being cooled by a hot end of the air heat regenerator 2 and the water cooling cooler 3; the condensed water is collected by the air heat regenerator 2 and the water receiving disc below the water cooling cooler 3 and then enters the condensed water recovery tank 6 for recycling.
In the cooling water flow path: the system adopts normal-temperature cooling water, the cooling water enters through a cooling water inlet 303 of the water-cooling cooler 3, and the air is cooled and then flows out of the system through a cooling water outlet 304.
In the system, the solar integrated heat collection-evaporator 1 is a key component, and the component has the functions of absorbing solar radiant heat and evaporating and transferring high-salt wastewater. In the solar integrated heat collection-evaporator 1, air is directly contacted with waste water in the box body 107 after forming air bubbles through the bubbler 8, and the evaporation mass transfer process is continuously carried out, the air outlet of the bubbler 8 is directly arranged at the bottom of the solar integrated heat collection-evaporator, so that the air bubbles can effectively pass through each layer of sieves Kong Lepian, the heat mass transfer surface area of the air bubbles and the waste water is increased, and the air outlet mounting and fixing position of the bubbler 8 is positioned between the tail end of the heat collection plate 104 and the bottom surface of the box body 107. The heat required in the evaporation mass transfer process is absorbed by the heat collecting plate 104 through solar radiation and then transferred to the waste water and air, and the air and the waste water are gradually heated along the air bubble flow direction, and meanwhile, the evaporation mass transfer process is performed, so that the radiation heat energy absorbed by the heat collecting plate 104 is timely transferred to the air and the waste water, the heat collecting plate 104 adopts a metal plate with a black heat conducting coating on the surface, and the heat collecting plate 104 is completely immersed in the waste water. The mesh ribs 105 have the functions of increasing the mass transfer surface area of air bubbles in contact with the wastewater, facilitating the strengthening of the evaporation mass transfer process, reducing the contact thermal resistance by directly welding the mesh ribs 105 with the metal heat collecting plate 104, strengthening heat exchange and promoting the heat exchange between the heat collecting plate 104 and the wastewater and air. In addition, the double-layer glass cover plate 103 and the heat-insulating back plate 106 have the functions of reducing heat dissipation loss between the solar integrated heat collection-evaporator 1 and the environment and improving heat collection efficiency.
In this embodiment, the air regenerator 2 may be a plate regenerator, a plate-fin regenerator, a fin heat pipe regenerator, or the like. The water-cooling cooler 3 can adopt a fin-tube heat exchanger, a plate-fin heat exchanger and the like, and cooling water is cooled by adopting warm water without chilled water. The high-salt wastewater to be treated in the wastewater supplementing tank 4 can be single-component or multi-component wastewater salt solution which can contain various metal salt ions, and the concentration of the wastewater solution is unlimited and only needs to be smaller than the saturation concentration. The solar integrated heat collection-evaporator 1, the air heat regenerator 2 and the water cooling cooler 3 all work at normal temperature and normal pressure; the temperature ranges from-0 ℃ to 100 ℃ and the pressure ranges from 0.95 atm to 1.05 atm.
The air circulation high-salt wastewater desalination treatment system provided by the invention has the following characteristics:
the system is green and efficient by taking solar energy as driving energy, so that the dependence on fossil energy is greatly reduced; the closed air circulation is adopted, so that the wastewater is not contacted with the environment, the transfer of pollutants in the treatment process is avoided, and the cleaning is reliable.
The system 2 can effectively aim at the metal salt waste liquid with the mass concentration of more than 1 percent, has low requirements on waste water components and has wide application range.
And 3, the system utilizes the solar integrated heat collection-evaporator to integrate the heat collection process and the evaporation process, and the solar heat collection quantity is used for the evaporation mass transfer process, so that the evaporation energy efficiency and the energy utilization rate of the system are effectively improved, and meanwhile, the equipment manufacturing cost of the system is also saved.
The air circulation arrangement and the heat regenerator of the system 4 further improve the energy utilization rate and the wastewater treatment efficiency of the whole system.
And 5, only an air pump is arranged on a power component of the system, so that the system has high operation reliability and low maintenance cost, and meanwhile, the system has low electric energy consumption, high system capacity ratio and low system operation cost.
In summary, the system can efficiently and cleanly treat high-salt wastewater and recover desalted condensate water, so that the problems of high energy consumption and low efficiency existing in the conventional evaporation method for treating the high-salt wastewater are solved to a certain extent, and the system can be used as a novel system device in the field of high-salt wastewater treatment and recovery.
Examples
The difference from embodiment 1 is that this embodiment provides another specific implementation structure of the solar-integrated heat collection-evaporator 1. As shown in fig. 3, the solar integrated heat collection-evaporator 1 includes a vacuum tube 110, a reflection condensing plate 111. As shown in fig. 4, the bottom end of the vacuum tube 110 arranged obliquely is closed, and an air header 113 is connected to the top end opening of the vacuum tube 110. A plurality of bubbling regeneration plates 112 are arranged in the vacuum tube 110 from bottom to top at intervals, the bubbling regeneration plates 112 are fixed through supporting bars 114 in the vacuum tube 110, through holes are densely distributed on the bubbling regeneration plates 112, and the diameter of the through hole at the upper half part is smaller than that of the through hole at the lower half part. Vacuum tube 110 is connected to butterfly valve 9 via air manifold 113. Bubbler 8 is inserted through each bubbler regeneration plate 112 from the top opening of vacuum tube 110. As shown in fig. 5, a reflection condensing plate 111 is provided at the back of the vacuum tube 110, and a reflection focusing point is located on the vacuum tube 110. The outlet of the waste liquid replenishing tank 4 is inserted into the vacuum tube 110 from the side of the air header 113 through a pipe.
The solar integrated heat collection-evaporator structure consists of the hyperboloid type reflecting light condensing plate 111 and the vacuum tube 110, the effective heat collection area of the device is not the area of the vacuum tube, but is expanded to be the projection area of the inclined plane of the reflecting light condensing plate 111, and meanwhile, the condensing effect promotes the heat collection efficiency in the heat collection evaporation process, and meanwhile, the average temperature of two-phase flow in the vacuum tube can be improved, so that the evaporation efficiency in the whole heat and mass transfer process is improved. The inclination of the irradiated face of the device to the ground is set to the local latitude, considering that the system needs to be used throughout the year.
As shown in fig. 4, air passes through the bubbler 8 to form air bubbles, and is discharged from the air outlet of the bubbler 8 at the bottom of the vacuum tube, and the air bubbles enter the vacuum tube and are mixed with wastewater stored in the vacuum tube to form a two-phase flow. Because of the requirement of solar energy equipment, the vacuum tube is arranged obliquely, and the bubbles are gradually agglomerated on the upper surface of the vacuum tube along with the flow, and the agglomeration phenomenon is more obvious along with the development of the two-phase flow of air and wastewater. Preliminary researches show that the bubble aggregation phenomenon is most serious at a position close to an irradiated inclined plane, and a large amount of bubbles are aggregated to cause three problems:
1. the two-phase flow on the upper side and the lower side of the vacuum tube is unevenly distributed, obvious phase liquid level appears in the tube, and the local high-temperature surface is increased, so that the heat collection efficiency of the heat collector is affected.
2. The bubbles are agglomerated in a large quantity, so that the contact area between two phase flows is reduced, and the efficiency of the heat and mass transfer process is reduced.
3. The two-phase flow distribution on the upper side and the lower side of the vacuum tube is uneven, so that the temperatures in the tube are respectively and obviously different, and the mass transfer resistance in the evaporation process is improved.
In order to alleviate the above problem, in the vacuum tube, a bubbling regeneration plate is provided at regular intervals, and the regeneration plate is provided in such a structure that the diameter of the through hole of the upper half is smaller than that of the through hole of the lower half as shown in fig. 5, that is, the through holes near the upper surface of the vacuum tube are dense and the through holes near the lower surface of the vacuum tube are sparse. The bubbling regeneration plate structure can effectively alleviate the problems caused by the agglomeration of bubbling bubbles compared with the sieve pore ribs 105 with uniform through holes in the embodiment 1, so that the contact of the bubbles with the wastewater is more uniform, and the evaporation and mass transfer of the wastewater are effectively promoted. In addition, a fixed hole for communicating the pipeline 115 of the bubbler 8 is reserved in the center of each bubbling regeneration plate, an air bubbling pipe is inserted from the side face of the air header 113 and is directly inserted into the reserved hole of each bubbling regeneration plate 112, inlet air can be bubbled into the vacuum pipe after being preheated primarily by means of wastewater, and the design can also increase the temperature of hot air of damp to a certain extent, so that the heat and mass transfer process is promoted. Finally, the air in the mixed two-phase flow breaks through the upper waste water interface and the baffle plate, is collected into the air header 113 and then enters the next-stage air regenerator device of the inflow system of the outflow device.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (4)
1. An air circulation high-salt wastewater desalination treatment system, comprising: the solar integrated heat collection-evaporator (1), an air heat regenerator (2), a water-cooling cooler (3), a waste liquid supplementing tank (4), a condensed water recovery tank (6), an air pump (7), a bubbler (8) and a butterfly air valve (9);
the air outlet of the air pump (7) is connected to the bubbler (8), the air outlet of the bubbler (8) is positioned at the bottom of the solar integrated heat collection-evaporator (1), the air outlet (101) at the top of the solar integrated heat collection-evaporator (1) is connected to the hot end inlet (201) of the air regenerator (2) through a butterfly air valve (9), the hot end outlet (202) of the air regenerator (2) is connected with the air inlet (301) of the water-cooling cooler (3), the air outlet (302) of the water-cooling cooler (3) is connected with the cold end inlet (203) of the air regenerator (2), and the cold end outlet (204) of the air regenerator (2) is connected with the air inlet of the air pump (7);
a cooling water inlet (303) and a cooling water outlet (304) of the water-cooled cooler (3) are both connected to the condensed water recovery tank (6); the bottom of the air heat regenerator (2) is provided with a first water receiving disc (205), the bottom of the water cooling cooler (3) is provided with a second water receiving disc (305), and water outlets of the first water receiving disc (205) and the second water receiving disc (305) are connected to the condensate water recovery tank (6);
the solar integrated heat collection-evaporator (1) is also provided with a waste water inlet (102), and the waste liquid supplementing tank (4) is connected with the waste water inlet (102);
the solar integrated heat collection-evaporator (1) comprises a double-layer glass cover plate (103), a heat collection plate (104), sieve pore ribs (105), a heat preservation backboard (106) and a box body (107); the box body (107) is of an open slot structure, the double-layer glass cover plate (103) is connected to the opening of the box body (107), the heat collecting plate (104) is arranged in the box body (107) and is parallel to the double-layer glass cover plate (103), the sieve pore ribs (105) are connected to the back of the heat collecting plate (104) at intervals along the length direction of the heat collecting plate (104), the sieve pore ribs (105) are perpendicular to the heat collecting plate (104), and the heat preservation backboard (106) is arranged on the bottom surface of the box body (107); the solar integrated heat collection-evaporator (1) is obliquely arranged, and the wastewater inlet (102) is positioned at the upper part of the bottom surface of the box body (107); the air outlet of the bubbler (8) is inserted from an air inlet (108) at the bottom of the solar integrated heat collection-evaporator (1) and is fixed between the tail end of the heat collection plate (104) and the bottom surface of the box body (107);
the heat collecting plate (104) is made of a metal plate with a black heat conducting coating on the surface, and the sieve pore ribs (105) are welded with the back of the heat collecting plate (104).
2. The air circulation high-salt wastewater desalination treatment system according to claim 1, wherein a concentrated wastewater recovery port (109) is further arranged at the lower part of the bottom surface of the box body (107) of the solar integrated heat collection-evaporator (1), and the concentrated wastewater recovery port (109) is connected with a concentrated wastewater recovery tank (5); in order to ensure the relative balance of the waste water liquid level in the solar integrated heat collection-evaporator (1), high-concentration waste water is discharged through the concentrated waste water recovery port (109) and enters the concentrated waste water recovery tank (5) for recovery and storage; the flow rate of the wastewater discharged from the concentrated wastewater recovery port (109)m w 109 The flow rate of the wastewater to be treated which needs to flow in from the wastewater inlet (102) through the wastewater replenishing tank (4)m w 102 Concentration ofc 0 Concentration of stored wastewater in the solar integrated heat collection-evaporator (1)c 1 To maintain the relative balance of the waste water level in the solar integrated heat collection-evaporator (1), the specific control relationship is as follows:m w 109 =m w 102 (c 0 /c 1 )。
3. an air circulation high-salt wastewater desalination treatment system, comprising: the solar integrated heat collection-evaporator (1), an air heat regenerator (2), a water-cooling cooler (3), a waste liquid supplementing tank (4), a condensed water recovery tank (6), an air pump (7), a bubbler (8) and a butterfly air valve (9);
the air outlet of the air pump (7) is connected to the bubbler (8), the air outlet of the bubbler (8) is positioned at the bottom of the solar integrated heat collection-evaporator (1), the air outlet (101) at the top of the solar integrated heat collection-evaporator (1) is connected to the hot end inlet (201) of the air regenerator (2) through a butterfly air valve (9), the hot end outlet (202) of the air regenerator (2) is connected with the air inlet (301) of the water-cooling cooler (3), the air outlet (302) of the water-cooling cooler (3) is connected with the cold end inlet (203) of the air regenerator (2), and the cold end outlet (204) of the air regenerator (2) is connected with the air inlet of the air pump (7);
a cooling water inlet (303) and a cooling water outlet (304) of the water-cooled cooler (3) are both connected to the condensed water recovery tank (6); the bottom of the air heat regenerator (2) is provided with a first water receiving disc (205), the bottom of the water cooling cooler (3) is provided with a second water receiving disc (305), and water outlets of the first water receiving disc (205) and the second water receiving disc (305) are connected to the condensate water recovery tank (6);
the solar integrated heat collection-evaporator (1) is also provided with a waste water inlet (102), and the waste liquid supplementing tank (4) is connected with the waste water inlet (102);
the solar integrated heat collection-evaporator (1) comprises a vacuum tube (110) and a reflection condensing plate (111); the bottom end of the vacuum tube (110) which is obliquely arranged is closed, a plurality of bubbling regeneration plates (112) are arranged in the vacuum tube (110) from bottom to top at intervals, through holes are densely distributed on the bubbling regeneration plates (112), and the diameter of the through hole in the upper half part of each bubbling regeneration plate (112) is smaller than that of the through hole in the lower half part; the bubbler (8) is inserted from the top opening of the vacuum tube (110) and passes through each bubbling regeneration plate (112); the reflection condensing plate (111) is arranged on the back of the vacuum tube (110), and the reflection focusing focus is positioned on the vacuum tube (110).
4. An air circulation high salt wastewater desalination treatment system as claimed in claim 3, wherein the outlet of the waste liquid makeup tank (4) is connected to the top opening of the vacuum tube (110) by a pipe.
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| CN102230675A (en) * | 2011-07-30 | 2011-11-02 | 戴文育 | Double-heat-conduction solar water heater |
| CN103771552B (en) * | 2014-02-12 | 2015-01-14 | 皇明太阳能股份有限公司 | Low-temperature solar sea water desalination device and sea water desalination method |
| CN104324587B (en) * | 2014-09-26 | 2016-08-24 | 常州友达环保科技有限公司 | The board-like bubble tower of fine ga(u)ge screen |
| CN106915792B (en) * | 2017-04-01 | 2020-01-03 | 南京工业大学 | Wind-solar complementary seawater desalination device |
| US20190241444A1 (en) * | 2018-02-08 | 2019-08-08 | King Fahd University Of Petroleum And Minerals | Solar humidifier and dehumidifier desalination method and system for the desalination of saline water |
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