CN111661888A - Falling film type air cooler based on evaporative air cooling technology and wastewater treatment process - Google Patents
Falling film type air cooler based on evaporative air cooling technology and wastewater treatment process Download PDFInfo
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- CN111661888A CN111661888A CN202010539679.7A CN202010539679A CN111661888A CN 111661888 A CN111661888 A CN 111661888A CN 202010539679 A CN202010539679 A CN 202010539679A CN 111661888 A CN111661888 A CN 111661888A
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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
- C02F1/08—Thin film evaporation
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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
- C02F1/048—Purification of waste water by evaporation
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/54—Free-cooling systems
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Abstract
The invention discloses a falling film type air cooler based on an evaporative air cooling technology, wherein a plurality of falling film plates are vertically and longitudinally arranged, and a water collecting tank is positioned on the right side of the tops of the falling film plates and is communicated with the falling film plates; a plurality of square through holes penetrating through the left side part and the right side part of the filter plate are formed in the filter plate on each falling film plate, each guide plate is in an isosceles triangle shape, the bottom edge of each guide plate is abutted against the liquid passing plate, a cavity is formed in each guide plate, an opening is formed in each guide plate facing the bottom edge of the liquid passing plate, the liquid passing plate is inserted into the guide plate, and a circular through hole is formed in the top end corresponding to the bottom edge of each guide plate; a connecting pipeline is arranged between the circular through holes of each two film falling plates; the water passing plate is communicated with the water collecting tank, and a plurality of drain holes are formed in the bottom of the water passing plate. The invention has the advantages of good heat transfer and mass transfer synchronism, no mass transfer downward movement phenomenon, extremely high heat transfer coefficient, small heat exchange temperature difference loss and field assembly.
Description
Technical Field
The invention relates to the field of high-salinity wastewater treatment, in particular to a falling-film air cooler based on an evaporative air cooling technology and a wastewater treatment process.
Background
For most plants, the soluble salts discharged from the plant are mainly derived from the use of fresh water from the plant, and the specific way to produce high-salt waste water is: purified wastewater generated in the factory water purification process, such as sewage discharge of a boiler desalination water system and sewage discharge of a boiler constant and continuous drainage system; the circulating cold water system discharges sewage formed for maintaining stable water quality. The indexes of soluble salts of the high-salinity water from the two paths are basically similar, and the similarity is expressed by the water quality components, the concentration ratio and the amount. The composition and quantity of soluble salts from the process system differ greatly for different production types of plants, and therefore the selection of high-salt wastewater treatment technology for high-salt wastewater treatment from the process system has a large influence, and another factor affecting this selection also includes differences in water quality in different regions.
The treatment of the high-salinity wastewater of the factory comprises three steps: pretreatment, reduction and salt separation. The pretreatment of the high-salinity wastewater creates conditions for subsequent reduction and salt separation. The main contents of the pretreatment include: COD treatment, hardness reduction, alkali reduction treatment, water insoluble matter removal and the like. Different reduction techniques have different requirements for preprocessing. The reduction of the high-salinity wastewater is a concentration process of soluble salt, and conditions are created for subsequent salt separation. The reduction technique generally adopts two effects of ion aggregation and solvent volatilization. Ion focusing such as membrane separation techniques, including pressure osmosis and electrodialysis; solvent evaporation such as MVR, TVR, MCC and the like. Salt separation is a necessary choice for realizing zero discharge of high-salinity wastewater, and the widely accepted and adopted technology at present is MVR technology. Under the complex condition of salt, the technology of nanofiltration, cold separation and the like can be involved.
However, the high-salinity wastewater treatment has the following problems: 1. technical problem, the problem which cannot be solved at present by the high-salinity wastewater treatment is salt separation, namely solid separation of salt. The main factor influencing the solid-state separation of salt is COD, part of the COD in the high-salinity water is from the production process and part of the COD is from the medicament addition in the water quality treatment process of a factory. For most factories, the latter is a main factor causing difficulty in salt separation, so that the premise of salt separation is that water is separated, and high-salinity wastewater from different flow paths of the factories is classified; 2. the economic problem, the treatment cost of the high brine is the core problem related to the profitability of enterprises, the high cost of the high brine treatment is divided into a salt separation link, namely a forced evaporation link, and the treatment cost of 1 ton of water in the link is 10 times of that in a reduction treatment stage, so that the higher the reduction treatment depth is, the lower the comprehensive treatment cost of the high brine is. Based on the above two problems, the development of high-salinity wastewater treatment technology focuses on the improvement and enhancement of quantitative technologies, and specifically, the technology is solved from two aspects: the technical level is as follows: the flow is improved, and the equipment level is improved; and (4) economic aspect: the energy utilization level is reduced, and the residual heat and the waste heat of the factory are utilized as much as possible. The problems with currently employed membrane separation (HERO) and Electrodialysis (EDR) techniques are: the permselectivity of the membrane is not high; the manufacturing cost is high and the service life is short; high power consumption and high energy utilization level. If the technology is used for regional environmental management and influence evaluation and analysis, secondary pollution caused by consumed electric energy is possibly more harmful to the environment than direct discharge of high-salt water, and the difference is only change of an environmental pollution mode, and the change increases difficulty and comparability of environmental influence evaluation; however, it is certain that the use of such technologies increases the total energy consumption and carbon emissions of society, and its environmental attributes are questionable.
The technology for treating high salinity wastewater by using the evaporation characteristic of the circulating cold water system has recently received great attention and acceptance from the industry, and the technology is briefly summarized as follows: 1. the surface evaporation air cooler originally is an improved water cooling device developed for solving the problem of load reduction of a dry air cooler under a high-temperature condition, and as the water cooling device, the surface evaporation air cooler adopts a circulating water closed flow, the equipment structure adopts a shell-and-tube heat exchange structure, a tube pass is a process cooling water circulation, and a shell pass is an evaporation water circulation. The water circulation of the shell pass is only started under the condition of high temperature, and the circulation is stopped under the condition of low temperature, so that the aim of saving water is fulfilled, namely the double-working-condition operation mode is realized. The heat transfer model of the surface evaporation air cooler is film phase change heat transfer and is characterized in that the phase change volatilization of water occurs on the outer surface of the heat exchange tube to strengthen the heat transfer. The control of the density of the spray water on the shell side is very critical. When the water spraying density is smaller, the heat transfer efficiency is high, but the pipe wall is easy to be hardened; when the size is larger, the heat transfer efficiency is liable to be lowered. When the shell pass water circulation of the surface evaporation air cooler adopts high salt water, the concentration effect can be generated, and the technical problems caused by the concentration effect are as follows: under the high salt water environment, the heat exchange tube of surface evaporation air cooler should not use the carbon steel again, and need upgrade to stainless steel series material, and equipment investment is the order of magnitude increase, and the tube structure of surface evaporation air cooler receives the restriction of manufacturing and transportation condition, and the throughput of single equipment is on the small side, is not suitable for large-scale chemical industry enterprise to use. 2. The open cooling tower or the spray tower solves the problem that the high-salt water and the ambient air transfer mass, and the heat energy required by the evaporation of the high-salt water exchanges heat with the circulating cold water by additionally arranging a heat exchange system. The technology seems to simply cut off the heat transfer and mass transfer processes, and actually has great influence on the system, which is reflected in the reduction of the heat transfer coefficient. Because the mass transfer is a phase change process, the phase change process can strengthen heat transfer, and after the mass transfer and heat transfer processes are cut, the heat transfer process becomes a heat exchange process between a liquid phase and a liquid phase, so that the total heat transfer coefficient of the system is remarkably reduced, and in fact, the surface evaporation air cooler also has the phenomenon of separating the mass transfer and the heat transfer, which is only different in degree. The heat exchange temperature difference loss is large and closely related to the circulation flow of high brine, when the circulation rate is controlled by the circulation flow, the heat transfer efficiency of the system is improved, the temperature difference loss is reduced, which is beneficial to the circulating cold water end, but the mass transfer efficiency of the tower side is reduced, and the power cost required by water circulation is increased; when the value of the circulation multiplying power of the high-salinity water is low, the mass transfer efficiency on the tower side is improved, but the heat transfer efficiency is reduced, the temperature difference loss of the system is increased, and the temperature of the circulating cooling water system is higher, so that the influence on the whole plant process system is unacceptable.
Disclosure of Invention
The invention aims to provide a falling film air cooler based on an evaporative air cooling technology and a working system, which have the advantages of good heat transfer and mass transfer synchronism, no mass transfer downward movement phenomenon, extremely high heat transfer coefficient, small heat exchange temperature difference loss and field assembly.
The technical purpose of the invention is realized by the following technical scheme:
a falling film type air cooler based on an evaporative air cooling technology comprises a plurality of falling film plates and a water collecting tank, wherein the falling film plates are vertically and longitudinally arranged, and the water collecting tank is positioned on the right sides of the tops of the falling film plates and is communicated with the falling film plates;
each falling film plate comprises a liquid passing plate, two guide plates which are bilaterally symmetrical along the liquid passing plate and a water passing plate positioned at the top of the liquid passing plate;
the liquid passing plate is rectangular, a plurality of square through holes penetrating through the left side part and the right side part of the filter plate are formed in the filter plate, each guide plate is in an isosceles triangle shape, the bottom edge of each guide plate is abutted against the liquid passing plate, a cavity is formed in each guide plate, an opening is formed in each guide plate facing the bottom edge of the liquid passing plate, the liquid passing plate is inserted into the guide plate, and a circular through hole is formed in the top end corresponding to the bottom edge of each guide plate;
a connecting pipeline is arranged between the circular through holes of each two film falling plates and is respectively communicated with the two film falling plates to form parallel connection;
the water passing plate is communicated with the water collecting tank, and a plurality of drain holes are formed in the bottom of the water passing plate.
A falling film type air cooler and a working system based on an evaporative air cooling technology comprise a first mechanical filtering device, a second mechanical filtering device, a hardness removing device, a plurality of falling film type air coolers, an MVR desalination evaporator, an NF salt separating device and a cold separation desalination device;
the first mechanical filtering device is respectively communicated with the water tanks of the falling film air coolers which are connected in series, a hardness removal device and a second mechanical filtering device are arranged between the inlet end of the water tank communicated with the first mechanical filtering device and the first mechanical filtering device, the outlet end of the hardness removal device is communicated with the inlet end of a second mechanical filtering device, the outlet end of the second mechanical filtering device is connected with the inlet end of a water tank of the first falling-film air cooler, the outlet end of the water tank of the penultimate falling film type air cooler is communicated with the inlet end of the NF salt separating device, the outlet end of the NF salt separating device is respectively communicated with the inlet end of the cold separation desalting device and the inlet end of the water tank of the falling film air cooler at the tail end, and the inlet end of the MVR desalination evaporator is communicated with the outlet end of the water tank of the tail-most falling film air cooler.
The preferred scheme is as follows:
preferably: the water tank is characterized by further comprising a fan frame, a water tank, a front side plate, a rear side plate, a left side plate, a right side plate, a water suction pump and a fan, wherein the fan frame is a cuboid with an opening at the bottom, the fan frame is positioned right above the water tank, the top of the water tank is provided with an opening, the front side plate, the rear side plate, the left side and the right side plate of the bottom opening of the fan frame are respectively provided with the front side plate and the rear side plate, the left side and the right side plate are respectively provided with the left side plate and the right side plate, the two front side plates and the two rear side plates and the two left side plates are enclosed to form a frame body, the bottom of the frame body is provided with a connecting column, the connecting column is fixedly connected with the top of the water tank, a plurality of the falling film plates are vertically fixed in the frame body in a longitudinal mode, the outlet end of the water pump is provided with a pipeline, and the outlet end of the pipeline is communicated with the water collecting tank. The high-salinity wastewater in the water tank is pumped into the water collecting tank by the water suction pump, the high-salinity wastewater flows into the water passing plate through the water collecting tank respectively, the high-salinity wastewater flows downwards through the water passing plate, the water passes through the liquid passing plate, circulating hot water is introduced into the falling film plate, the high-salinity wastewater in the liquid passing plate is evaporated, the high-salinity wastewater firstly passes through the mechanical filtering device and then passes through the water tanks of the falling film air coolers respectively, and the high-salinity wastewater is evaporated and concentrated.
Preferably: and the left side and the right side of the bottom of the plurality of membrane lowering plates are respectively provided with a support rod. The supporting rod is used for supporting the plurality of film falling plates.
Preferably: every the inside a plurality of water conservancy diversion strips that all are equipped with of guide plate, every the one end of water conservancy diversion strip is located the inside circular perforation department of guide plate, and the other end offsets with its one end that corresponds a plurality of square perforation on the liquid board of crossing respectively. The high-salinity wastewater of the diversion strips slides down along the falling film plate to exchange heat with the falling film plate, and the generated water vapor is pumped away by the fan, so that the concentration of the high-salinity wastewater is realized.
Preferably: and the sewage outlet end of the cold separation desalting device is communicated with the inlet end of the water tank of the falling film type air cooler at the tail end. And the water after passing through the cold separation desalting device enters a water tank of the tail end falling film type air cooler and then enters an MVR desalting evaporator from the outlet end of the water tank of the falling film type air cooler to carry out MVR desalting.
In conclusion, the invention has the advantages of good heat transfer and mass transfer synchronism, no mass transfer downward movement phenomenon, extremely high heat transfer coefficient, small heat exchange temperature difference loss and field assembly.
Drawings
FIG. 1 is an overall structural view of a falling film air cooler in the embodiment;
FIG. 2 is a side view of the embodiment with the front and rear side plates taken out;
FIG. 3 is a working diagram of the falling film plate in the embodiment;
FIG. 4 is an overall structure diagram of a falling film plate in the embodiment;
FIG. 5 is a partial cross-sectional view of an embodiment of a baffle;
fig. 6 is a schematic diagram of the operation of the embodiment.
In the figure, 1, a falling film plate; 2. a water collection tank; 3. a fan frame; 4. a water tank; 5. front and rear side plates; 6. a left side plate and a right side plate; 7. a water pump; 8. a fan; 9. connecting columns; 10. a first mechanical filtration device; 11. a second mechanical filter device; 12. a hardness removal device; 13. a falling film air cooler; 14. an MVR desalination evaporator; 15. NF divides the salt apparatus; 16. a cold-separation desalination device; 111. a liquid passing plate; 112. a baffle; 113. a water passing plate; 114. connecting a pipeline; 115. a support bar; 116. a flow guide strip; 711. a pipeline.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1-5, a falling film air cooler based on evaporative air cooling technology comprises a fan 8 frame 3, a water tank 4, front and rear side plates 5, left and right side plates 6, a water pump 7, a fan 8, a plurality of film dropping plates 1 and a water collecting tank 2, wherein the film dropping plates 1 are vertically arranged, the water collecting tank 2 is positioned at the right side of the top of the film dropping plates 1 and is communicated with the film dropping plates 1, the fan 8 frame 3, the water tank 4, the front and rear side plates 5, the left and right side plates 6, the water pump 7 and the fan 8 are arranged, the fan 8 frame 3 is a cuboid with an opening at the bottom, the fan 8 frame 3 is positioned right above the water tank 4, the top of the water tank 4 is provided with an opening, the front and rear sides of the bottom opening of the fan 8 frame 3 are respectively provided with the front and rear side plates 5, the left and right sides are respectively provided with the left and right side plates 6, spliced pole 9 and water tank 4's top fixed connection, a plurality of falling lamina membranacea 1 are vertical form and fix inside the framework, the left side and the right side of a plurality of 1 bottoms of falling lamina membranacea are equipped with bracing piece 115 respectively, be used for supporting a plurality of 1 that fall lamina membranacea, the connecting tube 114 of the back lateral part left end of a plurality of 1 that fall lamina membranacea is the entrance point, the connecting tube 114 of preceding lateral part right-hand member is the exit end, the fixed two fans 8 that are equipped with in top of fan 8 frame 3, suction pump 7 is located the left side of water tank 4, suction pump 7's entrance point and water tank 4 are linked together, suction pump 7's exit end department is equipped with pipeline 711, pipeline 711.
Each falling film plate 1 comprises a liquid passing plate 111, two guide plates 112 which are bilaterally symmetrical along the liquid passing plate 111, and a water passing plate 113 positioned at the top of the liquid passing plate 111;
the liquid passing plate 111 is rectangular plate-shaped, the filter plate is provided with a plurality of square through holes penetrating through the left side part and the right side part of the filter plate, each guide plate 112 is isosceles triangle, the bottom edge of each guide plate 112 is abutted against the liquid passing plate 111, the inner part of each guide plate 112 is provided with a cavity, the bottom edge of each guide plate 112 facing the liquid passing plate 111 is provided with an opening, the liquid passing plate 111 is inserted in the guide plate 112, circular perforation has all been seted up to the top department that the base of every guide plate 112 corresponds, all be equipped with connecting tube 114 between per two circular perforation that fall lamina membranacea 1, connecting tube 114 falls lamina membranacea 1 with two respectively and is linked together and form parallelly connected, every guide plate 112 is inside all to be equipped with a plurality of water conservancy diversion strips 116, the one end of every water conservancy diversion strip 116 is located the circular perforation department of guide plate 112 inside, the other end offsets rather than the one end of the square perforation of crossing on the liquid board 111 that corresponds respectively. The high-salinity wastewater of the diversion strips 116 slides along the membrane falling plate 1 to exchange heat with the membrane falling plate 1, and the generated steam is pumped away by the fan 8, so that the concentration of the high-salinity wastewater is realized.
The water passing plate 113 is communicated with the water collecting tank 2, and the bottom of the water passing plate 113 is provided with a plurality of water discharging holes.
The high-salinity wastewater in the water tank 4 is pumped into the water collecting tank 2 by the water suction pump 7, the high-salinity wastewater respectively flows into the water passing plate 113 through the water collecting tank 2, the high-salinity wastewater downwards flows through the water passing plate 113, the water passes through the liquid passing plate 111, circulating hot water is introduced into the falling film plate 1, the high-salinity wastewater in the liquid passing plate 111 is evaporated, and the high-salinity wastewater firstly passes through the mechanical filtering device and then respectively passes through the water tanks 4 of the falling film type air coolers 13 to be evaporated and concentrated.
As shown in fig. 6, a falling film air cooler and wastewater treatment process based on evaporative air cooling technology includes a first mechanical filter device 10, a second mechanical filter device 11, a hardness removal device 12, a plurality of falling film air coolers 13, an MVR desalination evaporator 14, an NF salt separation device 15, and a cold separation desalination device 16;
the first mechanical filter device 10 is respectively communicated with the water tanks 4 of the falling film type air coolers 13, the falling film type air coolers 13 are connected in series, a hardness removal device 12 and a second mechanical filter device 11 are arranged between the inlet end of the water tank 4 communicated with the first mechanical filter device 10 and the first mechanical filter device 10, the outlet end of the hardness removal device 12 is communicated with the inlet end of the second mechanical filter device 11, the outlet end of the second mechanical filter device 11 is connected with the inlet end of the water tank 4 of the first falling film type air cooler 13, wherein the first mechanical filter device 10 and the second mechanical filter device 11 are both mechanical filters for removing impurities, microorganisms, organic matters, active chlorine and the like in high-salt wastewater, after the first mechanical filter device 10 finishes filtering, the hardness removal is carried out, and the hardness removal is carried out by using a water softening device, namely lime, water and water are added into the water softening device, One or more of soda, caustic soda and trisodium phosphate are added, the added medicament reacts with heavy metal ions such as calcium, magnesium and the like in water to be treated to generate hydroxide or carbonate with low solubility and precipitate out, so that the effect of removing the impurities in India is achieved, the precipitate and water flowing out of the water softening equipment enter a second filtering device again for filtering, after filtering, the impurities are discharged, high-salt wastewater enters a water tank 4 of a first falling film type air cooler 13, the high-salt wastewater in the water tank 4 is pumped into a water collecting tank 2 by a water suction pump 7, the high-salt wastewater respectively flows into a water passing plate 113 through the water collecting tank 2, the high-salt wastewater flows downwards through the water passing plate 113, the water passes through the liquid passing plate 111, circulating hot water is introduced into the falling film plate 1 to evaporate the high-salt wastewater in the liquid passing plate 111, and the high-salt wastewater firstly passes through a mechanical filtering device, then the high-salinity wastewater is evaporated and concentrated by passing through a plurality of water tanks 4 of the falling-film air cooler 13.
The outlet end of the water tank 4 of the penultimate falling film air cooler 13 is communicated with the inlet end of an NF salt separating device 15, the outlet end of the NF salt separating device 15 is respectively communicated with the inlet end of a cold separation desalting device 16 and the inlet end of the water tank 4 of the rearmost falling film air cooler 13, and the inlet end of an MVR desalting evaporator 14 is communicated with the outlet end of the water tank 4 of the rearmost falling film air cooler 13. The sewage outlet end of the cold separation desalting device 16 is communicated with the inlet end of the water tank 4 of the tail end falling film type air cooler 13. The water after passing through the cold separation desalination device 16 enters the water tank 4 of the most end falling film air cooler 13, and then enters the MVR desalination evaporator 14 from the outlet end of the water tank 4 of the falling film air cooler 13 to carry out MVR desalination.
And the water subjected to NF salt separation enters the water tank 4 of the tail-end falling film type air cooler 13 again to be evaporated and concentrated, MVR desalination is performed, concentration and crystallization are performed to obtain monovalent salt, the monovalent salt is dried, condensed water is discharged, the solid subjected to NF salt separation is continuously subjected to cold separation desalination to obtain divalent salt, and then the divalent salt is dried.
The mechanical filtering device, the hardness removal device 12, the MVR desalination evaporator 14, the NF desalination device 15 and the cold separation desalination device 16 in the invention all adopt the prior art, the model, the manufacturer and the structure of the device are not limited, and all the technologies capable of realizing the same function are in the protection scope of the patent.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a falling film formula air cooler based on evaporation air cooling technique which characterized in that: the device comprises a plurality of membrane lowering plates (1) and a water collecting tank (2), wherein the membrane lowering plates (1) are vertically and longitudinally arranged, and the water collecting tank (2) is positioned on the right side of the tops of the membrane lowering plates (1) and communicated with the membrane lowering plates (1);
each membrane lowering plate (1) comprises a liquid passing plate (111), two guide plates (112) which are bilaterally symmetrical along the liquid passing plate (111), and a water passing plate (113) positioned at the top of the liquid passing plate (111);
the liquid passing plate (111) is in a rectangular plate shape, a plurality of square through holes penetrating through the left side part and the right side part of the filter plate (111) are formed in the filter plate (111), each guide plate (112) is in an isosceles triangle shape, the bottom edge of each guide plate (112) is abutted against the liquid passing plate (111), a cavity is formed in each guide plate (112), an opening is formed in the bottom edge of each guide plate (112) facing the liquid passing plate (111), the liquid passing plate (111) is inserted into the guide plate (112), and a circular through hole is formed in the top end corresponding to the bottom edge of each guide plate (112);
a connecting pipeline (114) is arranged between the circular through holes of every two film falling plates (1), and the connecting pipeline (114) is respectively communicated with the two film falling plates (1) to form parallel connection;
the water passing plate (113) is communicated with the water collecting tank (2), and a plurality of water discharging holes are formed in the bottom of the water passing plate (113).
2. The falling film air cooler based on the evaporative air cooling technology as claimed in claim 1, wherein: still include fan frame (3), water tank (4), around curb plate (5), control curb plate (6), suction pump (7) and fan (8), fan frame (3) are equipped with the open-ended cuboid for the bottom, fan frame (3) are located water tank (4) directly over, the top of water tank (4) is equipped with the opening, curb plate (6) about curb plate (5), left side and right side are equipped with respectively around the bottom opening front side of fan frame (3) is equipped with the rear side respectively, curb plate (5) enclose the framework around two with curb plate (6) about two, the bottom of framework is equipped with spliced pole (9), spliced pole (9) and the top fixed connection of water tank (4), a plurality of it fixes inside the framework to fall lamina membranacea (1) and be vertical form, a plurality of fall lamina membranacea (1) rear portion left end's entrance point connecting tube (114) for entrance point connecting tube (114), Connecting tube (114) of preceding lateral part right-hand member is the exit end, the fixed two fans (8) that are equipped with in top of fan frame (3), suction pump (7) are located the left side of water tank (4), the entrance point and water tank (4) of suction pump (7) are linked together, the exit end department of suction pump (7) is equipped with pipeline (711), the exit end and the water catch bowl (2) of pipeline (711) are linked together.
3. The falling film air cooler based on the evaporative air cooling technology as claimed in claim 2, wherein: the left side and the right side of the bottoms of the film falling plates (1) are respectively provided with a support rod (115).
4. The falling film air cooler based on the evaporative air cooling technology as claimed in claim 1, wherein: each guide plate (112) is internally provided with a plurality of guide strips (116), one end of each guide strip (116) is positioned at the circular perforated part inside the guide plate (112), and the other end of each guide strip is respectively abutted against one end of a plurality of square perforations on the corresponding liquid passing plate (111).
5. A wastewater treatment process based on a falling film air cooler according to claims 1 to 4, characterized in that: comprises a first mechanical filtering device (10), a second mechanical filtering device (11), a hardness removing device (12), a plurality of falling film air coolers (13), an MVR desalination evaporator (14), an NF salt separating device (15) and a cold separation desalination device (16);
the first mechanical filtering device (10) is communicated with the water tanks (4) of the falling film air coolers (13) respectively, the falling film air coolers (13) are connected in series, a hardness removing device (12) and a second mechanical filtering device (11) are arranged between the inlet end of the water tank (4) communicated with the first mechanical filtering device (10) and the first mechanical filtering device (10), the outlet end of the hardness removing device (12) is communicated with the inlet end of the second mechanical filtering device (11), the outlet end of the second mechanical filtering device (11) is connected with the inlet end of the water tank (4) of the first falling film air cooler (13), the outlet end of the water tank (4) of the penultimate falling film air cooler is communicated with the inlet end of the NF salt separating device (15), and the outlet end of the NF salt separating device (15) is respectively communicated with the inlet end of the cold-precipitation desalting device (16), The inlet end of the water tank (4) of the tail end falling film type air cooler (13) is communicated, and the inlet end of the MVR desalination evaporator (14) is communicated with the outlet end of the water tank (4) of the tail end falling film type air cooler (13).
6. The wastewater treatment process based on the falling film air cooler according to claim 5, characterized in that: the sewage outlet end of the cold separation desalting device (16) is communicated with the inlet end of the water tank (4) of the falling film type air cooler (13) at the tail end.
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