CN116062825A - High-salt wastewater salt extraction device - Google Patents
High-salt wastewater salt extraction device Download PDFInfo
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- CN116062825A CN116062825A CN202310354682.5A CN202310354682A CN116062825A CN 116062825 A CN116062825 A CN 116062825A CN 202310354682 A CN202310354682 A CN 202310354682A CN 116062825 A CN116062825 A CN 116062825A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
- B01D5/0012—Vertical tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
- B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
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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
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
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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
Abstract
The utility model relates to a high salt waste water carries salt device relates to inorganic salt evaporation separation technical field, it is including the evaporimeter that communicates in proper order, separator and vapor compressor, be provided with the feed inlet that is used for supplying waste water to get into on the evaporimeter, a holding chamber for holding waste water, a collection chamber for exchanging heat exchange chamber and being used for collecting concentrate, the heat exchange chamber is located between holding chamber and the collection chamber, the holding intracavity is provided with a plurality of condenser pipes and is used for carrying out the cloth liquid ware that separates with the waste water that gets into the evaporimeter top, vapor compressor carries steam to the heat exchange chamber through the steam conveyer pipe, and heat distribution subassembly heats up the waste water in each condenser pipe through dividing the heat subassembly, each heat transfer pipe and each condenser pipe closely butt for the contact time of extension steam and condenser pipe, and heat transfer pipe and condenser pipe one-to-one. This application has the inhomogeneous circumstances of condenser pipe heating of reduction, and then promotes the effect of evaporimeter heat conduction efficiency.
Description
Technical Field
The application relates to the technical field of inorganic salt evaporation and separation, in particular to a high-salt wastewater salt extraction device.
Background
The high-salt wastewater refers to wastewater with the total salt content of at least 1% by mass, and is mainly from chemical plants, oil and gas collection and processing and the like. Such wastewater contains a variety of substances including salts, oils, organic heavy metals, and radioactive materials. The generation way of the salt-containing wastewater is wide, and the water quantity is increased year by year. The removal of organic contaminants from saline wastewater is critical to the environmental impact.
The development of industrial wastewater treatment technology makes wastewater MVR evaporators popular in a plurality of enterprises all the time, and the wastewater MVR evaporators are used for treating high-salt wastewater and are common treatment processes at present. The working principle of the wastewater MVR evaporator is that low-temperature steam is compressed by a steam compressor, so that the temperature and the pressure are increased, the enthalpy is increased, and then the wastewater enters the evaporator for condensation, thereby fully utilizing the latent heat of the steam. The wastewater MVR evaporator does not need to supplement steam in the operation process, and all high-temperature condensed water generated in the system is used for preheating wastewater materials, so that the waste steam can be fully utilized, the latent heat is recovered, and the heat efficiency is improved. And (3) feeding the concentrated solution separated out from the evaporator into a thickener for thickening, and discharging the concentrated solution to a centrifugal machine for centrifugation when the concentrated solution reaches a preset concentration, so that solid salt is separated. And heating the centrifugal mother liquor by a heater and returning the centrifugal mother liquor to the front-stage evaporative crystallization system for continuous treatment.
Because a plurality of condenser pipes are distributed in the evaporator, the pipeline for conveying steam in the evaporator directly discharges the steam to the airtight space in which a plurality of condenser pipes are arranged in a penetrating manner, the steam encounters the liquefaction heat release of the condenser pipes, and then the temperature of waste water in the condenser pipes rises and evaporates the waste water, so that the concentration of the waste water flowing out of the condenser pipes can be improved, but the heating conditions of the condenser pipes at different positions in the evaporator are different, the liquefaction effect of the condenser pipes close to the steam pipeline is better than that of the condenser pipes far away from the steam pipeline, and therefore the problem that the condenser pipes are heated unevenly exists, and the heat conduction efficiency of the evaporator can be reduced.
Disclosure of Invention
In order to reduce the possibility that the condenser pipe is heated unevenly, and then promote the heat conduction efficiency of evaporimeter, this application provides a high salt waste water and carries salt device.
The application provides a high salt waste water draws salt device adopts following technical scheme:
the utility model provides a high salt waste water draws salt device, includes evaporimeter, separator and the vapor compressor that communicates in proper order, be provided with on the evaporimeter and be used for supplying the feed inlet of waste water entering, be used for holding the holding chamber of waste water, be used for exchanging heat the heat exchange chamber and be used for collecting concentrate, the heat exchange chamber is located the holding chamber with collect between the chamber, the holding intracavity is provided with a plurality of condenser pipes and is used for getting into the waste water at evaporimeter top carries out the liquid distributor that separates, liquid distributor set firmly in on the lateral wall of holding chamber, the holding chamber the condenser pipe with collect the chamber communicates in proper order, vapor compressor carries steam to the heat exchange chamber through the steam conveyer pipe to through dividing the heat subassembly with steam to each waste water in the condenser pipe goes on rising the temperature, divide the heat subassembly to include a plurality of heat transfer pipes, each heat transfer pipe with each condenser pipe closely supports for extension steam with the contact time of condenser pipe, just heat transfer pipe one-to-one.
Through adopting above-mentioned technical scheme, after high salt waste water flows into the evaporimeter from the feed inlet, high salt waste water can get into the holding intracavity at first, then high salt waste water distributes into every condenser pipe through the cloth liquid ware, and form even liquid membrane along the inner wall of condenser pipe, simultaneously steam gets into a plurality of heat transfer pipes from the vapor delivery pipeline, and flow to the bottom of heat transfer chamber under the direction effect of heat transfer pipe, vapor in the heat transfer pipe can take place liquefaction and give off heat when meeting the condenser pipe of lower temperature this moment, liquid membrane in the condenser pipe can absorb these heat that liquefaction produced in the process of flowing down, thereby make the temperature of liquid membrane rise, make liquid membrane boil and evaporate in the process of flowing down, after high salt waste water flows out from the bottom of condenser pipe and gets into the collection chamber, moisture partial evaporation in the high salt waste water forms secondary steam, and make the salt ion concentration in the high salt waste water rise and become concentrate, the bottom of collection chamber is discharged, secondary steam removes partial liquid that carries wherein through the separation effect of separator, and will carry in the secondary steam, and carry out the heat transfer to the pure steam through the compressor again, can carry out the compressor in the vapor after the high salt waste water flows out the temperature rising, thereby the secondary steam is fully carried in the vapor through the high temperature compressor, and the latent heat is fully performed to the vapor.
And when the evaporator works, steam can flow out of the heat transfer tubes uniformly, so that high-salt wastewater of each condensing tube can be heated uniformly, the problem that the condensing tubes are heated unevenly due to the difference of the positions of the condensing tubes is solved, and the heat conduction efficiency of the evaporator can be improved.
Optionally, each heat transfer tube is spirally wound on the outer wall of each condensing tube, and the bottom of the heat transfer tube is communicated with the bottom of the heat exchange cavity.
Through adopting above-mentioned technical scheme, the heat transfer pipe that the spiral set up not only can increase the path length that steam flowed through the condenser pipe by a wide margin to increase the area of contact of steam and condenser pipe, can prolong the contact time of steam and condenser pipe moreover, thereby make the steam in the heat transfer pipe fully contact with the outer wall of condenser pipe, promote the liquefaction efficiency of steam.
Optionally, the heat distribution assembly further comprises a plurality of heat shields, each heat shield is respectively sleeved on each condensing tube, the inner diameter of each heat shield is larger than the outer diameter of each heat transfer tube, and a water outlet for condensate to flow out is formed in the top opening and the bottom of each heat shield.
Through adopting above-mentioned technical scheme, the heat exchanger that overlaps on the condenser pipe is established can make the steam that flows from heat transfer pipe bottom surround around the condenser pipe all the time to further strengthen the availability factor of steam, and then can strengthen the liquefaction efficiency of steam.
Optionally, the heat distribution assembly further comprises a hot plate arranged between the heat transfer pipe and the condensation pipe, the hot plate is sleeved on the condensation pipe, one side of the hot plate is fixedly arranged on the outer wall of the condensation pipe, and the other side of the hot plate is fixedly connected with the heat transfer pipe.
By adopting the technical scheme, the heat in the steam can be rapidly transferred to the condensing pipe by the hot plate due to the capillary structure and the siphon effect in the hot plate, so that the heat conduction efficiency between the steam and the condensing pipe can be improved.
Optionally, the heat transfer tube is internally provided with heat conduction fins in a spiral manner, and one side of each heat conduction fin is fixedly connected with the hot plate.
By adopting the technical scheme, the heat conduction fins spirally arranged on the hot plate can further increase the contact area of steam and the hot plate, so that the heat conduction efficiency between the steam and the hot plate can be further improved.
Optionally, the heat transfer tube is a telescopic heat transfer tube, and is used for being heated and expanded and abutted against the inner side of the heat shield when the temperature of steam in the heat transfer tube is higher than a preset temperature.
Through adopting above-mentioned technical scheme, because the liquefaction of vapor in the heat transfer pipe can give off heat to make the temperature in the heat transfer pipe rise, when the temperature in the heat transfer pipe is higher than the default temperature, the heat transfer pipe can take place to expand after being heated, thereby can increase the area of contact between heat transfer pipe and the condenser pipe, and then make the vapor in the heat transfer pipe can fully contact with the condenser pipe and promote the liquefaction efficiency of vapor.
Optionally, the heat exchanger inner wall is provided with a plurality of temperature sensor and a plurality of pressure sensor, be provided with controller and display screen on the evaporimeter outer wall, temperature sensor pressure sensor all with controller electric connection, and all pass through the display screen real-time display pressure sensor temperature sensor's data that the temperature sensor measured, the controller with vapor pressure compressor electric connection.
Through adopting above-mentioned technical scheme, temperature sensor can be accurate discernment heat exchanger in the temperature, when the heat transfer pipe thermal expansion and support tightly in the inner wall of heat exchanger, pressure sensor can be accurate discernment heat exchanger received pressure, temperature sensor and pressure sensor can be with temperature data and the pressure data that it detected show through the display screen in real time, thereby make the staff can audio-visual operating condition in the evaporimeter, when pressure sensor detects the pressure that the heat exchanger received too big, the staff can control the temperature of steam through the rotational speed of controller control vapor compressor, reduce the heat transfer pipe and excessively be heated the expansion and lead to the impaired condition of heat transfer pipe, thereby can promote the life of heat transfer pipe.
Optionally, the heat transfer tube is semicircular, and the distance between the upper part and the lower part of the heat transfer tube is smaller than the diameter of the heat transfer tube.
Through adopting above-mentioned technical scheme, can increase the area of contact with the condenser pipe through semicircular heat transfer pipe, the decline rate of heat transfer pipe is less moreover, and steam can fully contact with the outer wall of condenser pipe to can promote the heat conduction efficiency between heat transfer pipe and the condenser pipe.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when high-salt wastewater flows into the evaporator from the feed inlet, the high-salt wastewater firstly enters the accommodating cavity, then the high-salt wastewater is distributed into each condensing pipe through the liquid distributor, a uniform liquid film is formed along the inner wall of the condensing pipe, meanwhile, steam enters the plurality of heat transfer pipes from the steam conveying pipeline and flows to the bottom of the heat transfer cavity under the guiding action of the heat transfer pipes, at the moment, the steam in the heat transfer pipes can liquefy and emit heat when encountering the condensing pipes with lower temperature, the liquid film in the condensing pipes can absorb the heat generated by the liquefaction in the downward flowing process, so that the temperature of the liquid film is increased, the liquid film boils and evaporates in the downward flowing process, when the high-salt wastewater flows out from the bottom of the condensing pipes and enters the collecting cavity, the water in the high-salt wastewater is partially evaporated to form secondary steam, the salt ion concentration in the high-salt wastewater rises to become concentrated solution, the concentrated solution is discharged from the bottom of the collecting cavity through the guiding action of the heat transfer pipes, the secondary steam in the heat transfer pipes can be liquefied and discharged from the bottom of the collecting cavity, the secondary steam is input into the steam compressor through the separating action of the separator, the secondary steam can be compressed through the separator, and then the secondary steam can be fully heated through the heat transfer pipes after the high-salt wastewater is compressed, and the secondary steam is fully heated. In addition, when the evaporator works, steam can uniformly flow out of the heat transfer tubes, so that high-salt wastewater of each condensing tube can be uniformly heated, the problem of uneven heating of the condensing tubes due to different positions of the condensing tubes is solved, and the heat conduction efficiency of the evaporator can be improved;
2. the heat transfer tube arranged in a spiral way can greatly increase the path length of steam flowing through the condensing tube, so that the contact area of the steam and the condensing tube is increased, the contact time of the steam and the condensing tube can be prolonged, the steam in the heat transfer tube is fully contacted with the outer wall of the condensing tube, and the liquefaction efficiency of the steam is improved;
3. because the steam liquefaction in the heat transfer tube can emit heat, the temperature in the heat transfer tube is increased, when the temperature in the heat transfer tube is higher than the preset temperature, the heat transfer tube can expand after being heated, so that the contact area between the heat transfer tube and the condensing tube can be increased, and the steam in the heat transfer tube can be fully contacted with the condensing tube, and the liquefaction efficiency of the steam is improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present application;
FIG. 2 is a cross-sectional view of the evaporator of the present embodiment;
fig. 3 is a partially enlarged schematic view of fig. 2 a of the present embodiment.
Reference numerals illustrate: 1. an evaporator; 11. a feed inlet; 12. a receiving chamber; 13. a heat exchange cavity; 14. a collection chamber; 15. a condensing tube; 16. a liquid distributor; 17. a steam delivery pipe; 18. a drain pipe; 19. a dispensing chamber; 2. a separator; 3. a vapor compressor; 4. a heat distribution assembly; 41. a heat transfer tube; 42. a heat shield; 421. a water outlet; 43. a hot plate; 44. a heat conducting fin; 5. a temperature sensor; 6. a pressure sensor; 7. a controller; 8. and a display screen.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-3.
The embodiment of the application discloses a high-salt wastewater salt extraction device. Referring to fig. 1 and 2, the high-salt wastewater salt extraction device comprises an evaporator 1, a separator 2, a vapor compressor 3 and a heat distribution assembly 4, wherein the evaporator 1, the separator 2 and the vapor compressor 3 are sequentially communicated, a feed inlet 11 for wastewater to enter, a containing cavity 12 for containing wastewater, a heat exchange cavity 13 for exchanging heat and a collecting cavity 14 for collecting concentrated solution are arranged on the evaporator 1, and the heat exchange cavity 13 is positioned between the containing cavity 12 and the collecting cavity 14. The accommodating cavity 12 is internally provided with a plurality of condensing pipes 15 and a liquid distributor 16 for separating wastewater entering the top of steam, the liquid distributor 16 is fixedly arranged on the side wall of the accommodating cavity 12, the condensing pipes 15 and the collecting cavity 14 are sequentially communicated, the steam compressor 3 conveys steam to the heat exchange cavity 13 through the steam conveying pipe 17, and the temperature of the wastewater in each condensing pipe 15 is raised through the heat distribution assembly 4.
In this embodiment, the bottom of the evaporator 1 is provided with a thickener which communicates with the bottom of the collection chamber 14 to thicken the concentrate at the bottom of the collection chamber 14. The feed inlet 11 is vertically arranged at the top of the evaporator 1 and is communicated with the accommodating cavity 12, the heat exchange cavity 13 is not communicated with the accommodating cavity 12 and the collecting cavity 14, and a drain pipe 18 for condensate to flow out is arranged at the bottom of the heat exchange cavity 13.
It should be noted that, in this embodiment, the number and the aperture of the condensation pipes 15 are not particularly limited, and the related personnel can adjust the number and the aperture of the condensation pipes 15 according to the amount of wastewater actually required to be treated, so as to meet the treatment requirement of the high-salt wastewater. When the device is worth noting, the high-salt wastewater entering the accommodating cavity 12 is split under the action of the liquid distributor 16 and enters each condensation pipe 15, so that a uniform liquid film is formed on the inner wall of the condensation pipe 15, the vapor can timely heat the liquid film on the side wall of the condensation pipe 15, the moisture in the liquid film is evaporated, the possibility that the wastewater in the condensation pipe 15 enters the collecting cavity 14 from the bottom of the condensation pipe 15 before being sufficiently heated is reduced, and therefore the flow rate of the wastewater in the condensation pipe 15 can be slowed down, and the evaporation efficiency of the vapor to the wastewater is improved.
When the high-salt wastewater enters the accommodating cavity 12 from the feed inlet 11 at the top of the evaporator 1, the high-salt wastewater is uniformly split into the condensing pipes 15 through the liquid distributor 16, a uniform liquid film is formed in the condensing pipes 15, steam in the steam conveying pipe 17 enters the heat exchange cavity 13 and then contacts with the outer wall of the condensing pipes 15, when the steam with higher temperature meets the outer wall of the condensing pipes 15 with lower temperature, the steam is cooled and liquefied to generate condensed water, heat is released in the steam liquefaction process, the outer wall of the condensing pipes 15 absorbs the heat generated by the steam liquefaction and is transferred to the liquid film flowing on the inner wall of the condensing pipes 15, and the temperature of the liquid film rises after absorbing the heat from the condensing pipes 15, so that part of water in the liquid film is evaporated.
In the process of flowing down the liquid film, the moisture is continuously evaporated to become secondary steam, so that the moisture in the liquid film is continuously reduced, when the high-salt wastewater flows into the collecting cavity 14 from the bottom of the condensing tube 15, the secondary steam mixed with a small amount of liquid molecules stays at the top of the collecting cavity 14, at the moment, the concentrated solution with higher concentration and viscosity flows into the bottom of the collecting cavity 14, and the concentrated solution is thickened by the thickener and enters the subsequent separating equipment to separate the salt in the concentrated solution.
The secondary steam floating on the top of the collecting chamber 14 enters the separator 2 through a pipeline, and the liquid in the secondary steam is further absorbed and subjected to gas-liquid separation through the separator 2, so that the secondary steam is purified. The purified secondary steam flows out through a pipeline at the top of the separator 2 and enters the steam compressor 3 for compression, the temperature and the pressure of the secondary steam are increased through the compression of the steam compressor 3, and the heated secondary steam is input into the evaporator 1 through the steam conveying pipe 17, so that a liquid film flowing in the evaporator 1 is evaporated, new secondary steam is generated, and the full utilization of the latent heat of the secondary steam is realized.
Referring to fig. 1, 2 and 3, the heat distribution assembly 4 includes heat transfer tubes 41, a heat shield 42, a heat plate 43 and heat conduction fins 44, wherein the heat transfer tubes 41, the heat shield 42, the heat plate 43 and the heat conduction fins 44 are all provided with a plurality of heat transfer tubes 41, each heat transfer tube 41 is spirally wound on the outer wall of each condensation tube 15 and tightly abutted with each condensation tube 15, the heat transfer tubes 41 are in one-to-one correspondence with the condensation tubes 15 and are used for prolonging the contact time of steam and the condensation tubes 15, and the bottoms of the heat transfer tubes 41 are communicated with the bottoms of the heat exchange cavities 13. The heat transfer tube 41 is semicircular, and the distance between the upper and lower sides of the heat transfer tube 41 is smaller than the diameter of the heat transfer tube 41.
In this embodiment, the top of each heat transfer tube 41 is communicated with the steam transfer tube 17 through a pipeline, the bottom of each heat transfer tube extends to the bottom of the heat exchange cavity 13, and after entering the evaporator 1 from the steam transfer tube 17, steam is split into each heat transfer tube 41, so that the steam can uniformly heat up each condensation tube 15, the problem of uneven heating between the condensation tube 15 close to the steam transfer tube 17 and the condensation tube 15 far away from the steam transfer tube 17 is reduced, and the use efficiency of the steam in the evaporator 1 can be improved. The top of each heat transfer tube 41 is in communication with the vapor delivery tube 17 through the distribution chamber 19.
The spiral arrangement of the heat transfer tube 41 can prolong the path length of the steam flow, so that the residence time of the steam in the heat transfer cavity 13 can be prolonged, and the steam is fully contacted with the condensation tube 15, so that the evaporation effect of the steam on the liquid film in the condensation tube 15 can be improved. The steam is continuously contacted with the outer wall of the condensing tube 15 and continuously liquefied and gives off heat in the process of downwards moving in the heat transfer tube 41, condensate generated by the liquefaction flows along the bottom of the heat transfer tube 41, flows into the bottom of the heat exchange cavity 13 from the bottom opening of the heat transfer tube 41, and is finally discharged from the drain pipe 18 on the side wall of the evaporator 1.
The heat shields 42 and the hot plates 43 are in one-to-one correspondence with the condensation pipes 15, each heat shield 42 is sleeved on each condensation pipe 15, the inner diameter of each heat shield 42 is larger than the outer diameter of the heat transfer pipe 41, and the top opening and the bottom of each heat shield 42 are provided with a water outlet 421 for condensate to flow out. The hot plate 43 is arranged between the heat transfer tube 41 and the condensation tube 15, the hot plate 43 is sleeved on the condensation tube 15, one side of the hot plate 43 is fixedly arranged on the outer wall of the condensation tube 15, and the other side is fixedly connected with the heat transfer tube 41. The heat conducting fins 44 are spirally disposed in the heat conducting tube 41, and one side of the heat conducting fins 44 is fixedly connected with the heat plate 43. The heat transfer tube 41 is a telescopic heat transfer tube 41, and is used for being heated and expanded and abutted against the inner side of the heat shield 42 when the temperature of steam in the heat transfer tube 41 is higher than a preset temperature.
In the present embodiment, the inside of the hot plate 43 is vacuum and has a capillary structure, and has good heat conduction efficiency; when the temperature of the steam in the heat transfer tube 41 is lower than a preset temperature, a gap exists between the heat shield 42 and the heat transfer tube 41.
When the vapor contacts with the side of the heat plate 43 far from the condensation tube 15, the cooling liquid in the heat plate 43 is heated and vaporized, so that the gaseous coolant in the heat plate 43 continuously fills the cavity in the heat plate 43, and when the gaseous coolant in the heat plate 43 moves to the side close to the condensation tube 15, the gaseous coolant liquefies and releases heat when encountering cold due to the lower temperature of the side of the heat transfer tube 41, and the heat is transferred to the liquid film flowing on the inner wall of the condensation tube 15, so that the temperature of the liquid film rises and the moisture in the liquid film evaporates. The heat exchange rate between the vapor and the condensation duct 15 can be enhanced by the hot plate 43, so that the evaporation effect of the vapor on the liquid film in the condensation duct 15 can be enhanced. The heat conducting fins 44 spirally arranged on the hot plate 43 can further increase the contact area between the steam and the hot plate 43, so that the heat conducting efficiency between the steam and the hot plate 43 can be further improved.
The steam flowing out from the bottom of the heat transfer tube 41 is higher than the ambient temperature in the heat exchange chamber 13 although the temperature is reduced, and because the density of the steam is light, the steam flows upwards along the inner wall of the heat shield 42, the outer wall of the heat transfer tube 41 and the outer wall of the hot plate 43, so that the steam contacts the hot plate 43 again and liquefies and releases heat, thereby improving the use efficiency of the steam.
The inner wall of the heat shield 42 is provided with a plurality of temperature sensors 5 and a plurality of pressure sensors 6, the outer wall of the evaporator 1 is provided with a controller 7 and a display screen 8, the temperature sensors 5 and the pressure sensors 6 are electrically connected with the controller 7, data measured by the pressure sensors 6 and the temperature sensors 5 are displayed in real time through the display screen 8, and the controller 7 is electrically connected with the vapor compressor 3.
In this embodiment, a temperature sensor 5 and a pressure sensor 6 are disposed in each heat shield 42, the temperature sensor 5 is used for monitoring the temperature in the heat shields 42 in real time, the pressure sensor 6 is used for monitoring the pressure generated by the heat transfer tubes 41 to the heat shields 42 when the heat transfer tubes 41 expand, when the data monitored by the pressure sensor 6 is higher than a preset value, an alarm signal is sent to the controller 7, the controller 7 controls the vapor compressor 3, so that the vapor temperature in the vapor delivery tube 17 is reduced, the damage or even breakage of the heat transfer tubes 41 caused by the excessive expansion of the heat transfer tubes 41 is reduced, and the service life of the heat transfer tubes 41 is prolonged. The temperature sensor 5 and the pressure sensor 6 can display the detected temperature data and pressure data in real time through the display screen 8, so that a worker can intuitively observe the working state in the evaporator 1.
The implementation principle of the high-salt wastewater salt extraction device provided by the embodiment of the application is as follows: when the high-salt wastewater flows into the evaporator 1 from the feed inlet 11, the high-salt wastewater firstly enters the accommodating cavity 12, then the high-salt wastewater is distributed into each condensing pipe 15 through the liquid distributor 16, a uniform liquid film is formed along the inner wall of the condensing pipe 15, meanwhile, steam enters the plurality of heat transfer pipes 41 from the steam conveying pipe 17 and flows towards the bottom of the heat transfer cavity 13 under the guiding action of the heat transfer pipes 41, at the moment, the steam in the heat transfer pipes 41 liquefies and emits heat when encountering the condensing pipe 15 with lower temperature, and the liquid film in the condensing pipe 15 absorbs the heat generated by the liquefaction in the downward flowing process, so that the temperature of the liquid film is increased, and the liquid film boils and evaporates in the downward flowing process.
When the high-salt wastewater flows out from the bottom of the condensation pipe 15 and enters the collection cavity 14, the water in the high-salt wastewater is partially evaporated to form secondary steam, the concentration of salt ions in the high-salt wastewater rises to become concentrated solution, the concentrated solution is discharged from the bottom of the collection cavity 14, the secondary steam removes part of liquid carried by the secondary steam through the separation effect of the separator 2, pure secondary steam is input into the vapor compressor 3, the secondary steam is compressed and heated through the vapor compressor 3, then the heated secondary steam enters the heat transfer pipe 41 through the steam conveying pipe 17, and the high-salt wastewater in the condensation pipe 15 is heated again, so that the latent heat of the secondary steam can be fully exerted.
And when the evaporator 1 works, steam can uniformly flow out of the heat transfer tube 41, so that high-salt wastewater of each condenser tube 15 can be uniformly heated, the problem that the condenser tubes 15 are heated unevenly due to different positions of the condenser tubes 15 is solved, and the heat conduction efficiency of the evaporator 1 can be improved.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (8)
1. The utility model provides a high salt waste water draws salt device which characterized in that: the evaporator (1) is provided with a feed inlet (11) for allowing wastewater to enter, a containing cavity (12) for containing wastewater, a heat exchange cavity (13) for exchanging heat and a collecting cavity (14) for collecting concentrated liquid, wherein the heat exchange cavity (13) is positioned between the containing cavity (12) and the collecting cavity (14), a plurality of condensing pipes (15) and a liquid distributor (16) for separating wastewater entering the top of the evaporator (1) are arranged in the containing cavity (12), the liquid distributor (16) is fixedly arranged on the side wall of the containing cavity (12), the condensing pipes (15) and the collecting cavity (14) are sequentially communicated, the vapor compressor (3) conveys vapor to the heat exchange cavity (13) through a vapor conveying pipe (17) and carries out vapor to each condensing pipe (15) through a heat component (4), each condensing pipe (15) is closely contacted with one heat transfer pipe (41) in a plurality of heat transfer pipes (41) in contact with each condensing pipe (41), and the heat transfer pipes (41) are in one-to-one correspondence with the condensing pipes (15).
2. The high-salt wastewater salt extraction device according to claim 1, wherein: each heat transfer tube (41) is spirally wound on the outer wall of each condensing tube (15), and the bottom of the heat transfer tube (41) is communicated with the bottom of the heat exchange cavity (13).
3. The high-salt wastewater salt extraction device according to claim 2, wherein: the heat distribution assembly (4) further comprises a plurality of heat shields (42), each heat shield (42) is sleeved on each condensing tube (15) respectively, the inner diameter of each heat shield (42) is larger than the outer diameter of each heat transfer tube (41), and a water outlet (421) for condensate to flow out is formed in the top opening and the bottom of each heat shield (42).
4. A high salt wastewater brine extraction device according to claim 3 wherein: the heat distribution assembly (4) further comprises a hot plate (43) arranged between the heat transfer tube (41) and the condensing tube (15), the hot plate (43) is sleeved on the condensing tube (15), one side of the hot plate (43) is fixedly arranged on the outer wall of the condensing tube (15), and the other side of the hot plate is fixedly connected with the heat transfer tube (41).
5. The high-salt wastewater salt extraction device according to claim 4, wherein: the heat transfer tube (41) is internally provided with heat conduction fins (44) in a spiral mode, and one side of each heat conduction fin (44) is fixedly connected with the corresponding hot plate (43).
6. A high salt wastewater brine extraction device according to claim 3 wherein: the heat transfer tube (41) is a telescopic heat transfer tube (41) and is used for being heated and expanded and abutted against the inner side of the heat shield (42) when the temperature of steam in the heat transfer tube (41) is higher than the preset temperature.
7. The high-salt wastewater salt extraction device of claim 6, wherein: the heat shield (42) inner wall is provided with a plurality of temperature sensor (5) and a plurality of pressure sensor (6), be provided with controller (7) and display screen (8) on evaporimeter (1) outer wall, temperature sensor (5) pressure sensor (6) all with controller (7) electric connection, and all pass through display screen (8) real-time display pressure sensor (6) the data that temperature sensor (5) measured, controller (7) with vapor compressor (3) electric connection.
8. The high-salt wastewater salt extraction device according to claim 2, wherein: the heat transfer tube (41) is semicircular, and the vertical distance between the heat transfer tube (41) is smaller than the diameter of the heat transfer tube (41).
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