CN115583768A - High-ore desalted water evaporation crystallization device and high-ore desalted water treatment method - Google Patents
High-ore desalted water evaporation crystallization device and high-ore desalted water treatment method Download PDFInfo
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- CN115583768A CN115583768A CN202211385676.8A CN202211385676A CN115583768A CN 115583768 A CN115583768 A CN 115583768A CN 202211385676 A CN202211385676 A CN 202211385676A CN 115583768 A CN115583768 A CN 115583768A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 238000001704 evaporation Methods 0.000 title claims abstract description 47
- 230000008020 evaporation Effects 0.000 title claims abstract description 39
- 238000002425 crystallisation Methods 0.000 title claims abstract description 28
- 230000008025 crystallization Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000011552 falling film Substances 0.000 claims abstract description 58
- 239000011550 stock solution Substances 0.000 claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 25
- 239000011707 mineral Substances 0.000 claims abstract description 25
- 238000003756 stirring Methods 0.000 claims abstract description 23
- 239000013078 crystal Substances 0.000 claims abstract description 21
- 239000002002 slurry Substances 0.000 claims abstract description 14
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 24
- 239000007921 spray Substances 0.000 claims description 11
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 description 13
- 239000003921 oil Substances 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 230000033558 biomineral tissue development Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000001223 reverse osmosis Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- -1 suspended matters Substances 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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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
-
- 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
-
- 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
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
-
- 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
- Y02A20/131—Reverse-osmosis
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to a high-mineral desalted water evaporation crystallization device, which comprises a preheating device; the falling film evaporation system is connected with the preheating device through a pipeline, and the preheated stock solution enters the falling film evaporation system to be evaporated to a saturated or supersaturated state; the stirring crystallizer is connected with a water outlet pipeline of the falling film evaporation system; and the centrifugal dehydrator is connected with the stirring crystallizer through a pipeline. A high-mineral desalted water treatment method comprises the following steps: step S01, adding the stock solution into a preheating device for preheating; s02, inputting the preheated stock solution into a falling film evaporation system, evaporating by using a falling film evaporator, and evaporating the stock solution to a saturated or supersaturated state by using high-temperature steam; s03, inputting the stock solution into a stirring crystallizer again for crystallization and stirring to form crystal slurry; and S04, inputting the crystal slurry into a centrifugal dehydrator for centrifugal separation, and separating out the raw liquid from the crystals. The device has short flow, low equipment investment cost and lower energy consumption.
Description
Technical Field
The invention relates to a high-mineral desalted water evaporation crystallization device and a high-mineral desalted water treatment method.
Background
Coal mining generates a large amount of mine water, and brings certain pressure to the ecological environment of a mining area, so that the treatment work of the mine water needs to be carried out, and the utilization rate of water resources is improved. Due to the influence of mining activities and geological conditions, mine water contains pollutants such as suspended matters, oils, heavy metals, radioactivity, fluoride, mineralization degree and the like. According to different pollutant types, the mine water is divided into: mine water containing suspended matters, mine water with high mineralization degree and mine water with acid mine water containing special pollutants.
Different mine water treatment methods are naturally different. International and domestic environmental protection people have carried out a great deal of research on the treatment of coal high-salinity mine water, but because of the characteristics of special cause of high-salinity wastewater, relatively complex components and large water quality change, the treatment cost is high, at present, the treatment of the high-salinity mine water still stays in a relatively extensive treatment stage, mainly solves the problem of purifying recycled clean water through some traditional relatively simple and mature processes, such as flocculation precipitation, microfiltration and nanofiltration, reverse osmosis and the like, but inevitably generates concentrated water with ultrahigh salinity, namely high-salinity desalted water. At present, no efficient and economical treatment method is found at home and abroad for the high-mineralization desalted water. Evaporative crystallization is the current mainstream technology, and has the defects of high energy consumption, large investment, complex operation and secondary pollution, and is a problem of treating symptoms and not treating the root causes. Meanwhile, along with the annual improvement of the standard improvement and recycling requirements of mine water treatment, the reverse osmosis membrane has wider application in the field of mine water recycling along with the increasing maturity of water treatment membrane technology and the reduction of manufacturing cost. However, after the mine water with low mineralization degree is treated by the membrane technology, a large amount of concentrated water with ultrahigh mineralization degree can be produced. Therefore, the deep treatment of the highly mineralized mine water and the ultra-highly mineralized concentrated water is researched, and the method has practical and long-term significance for the full resource utilization of the mine water.
At present, the most effective treatment method for the high-salinity concentrated water after the reverse osmosis process is evaporative crystallization, so that raw water can be discharged after reaching the standard, and salt in the raw water can be extracted for resource utilization. The traditional evaporative crystallization process includes a single-effect evaporation process, a multi-effect evaporation process, an MVR process and the like, but the processes extract salt in the salt, but the cost and the energy consumption are relatively high.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the high-mineral desalted water evaporation and crystallization device and the high-mineral desalted water treatment method are provided, and the problems of high equipment investment cost and high equipment energy consumption in the high-mineral desalted water treatment process by adopting a single-effect evaporation process, a multiple-effect evaporation process, an MVR (mechanical vapor recompression) process and the like are solved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect:
provides a high-mineral desalted water evaporative crystallization device, which comprises
The preheating device is suitable for preheating the stock solution;
the falling film evaporation system is connected with the preheating device through a pipeline, and the preheated stock solution enters the falling film evaporation system to be evaporated to a saturated or supersaturated state;
the stirring crystallizer is connected with a water outlet pipeline of the falling film evaporation system and is suitable for stirring the saturated or supersaturated stock solution to form crystal slurry;
and the centrifugal dehydrator is connected with the pipeline of the stirring crystallizer and is suitable for crystallizing and separating the crystal slurry.
Further, the falling film evaporation system comprises
A raw liquid inlet at the top of the falling-film evaporator is connected with a preheating device pipeline, a water outlet at the bottom of the falling-film evaporator is connected with a stirring crystallizer pipeline, a steam inlet of the falling-film evaporator is connected with a steam reheater pipeline, and a first steam outlet of the falling-film evaporator is connected with a gas-liquid separator pipeline;
the inlet of the gas-liquid separator is connected with the first steam outlet of the falling film evaporator, and the outlet of the gas-liquid separator is connected with the inlet pipeline of the steam reheater;
the inlet of the steam reheater is connected with the gas-liquid separator through a pipeline, and the outlet of the steam reheater is connected with the falling film evaporator through a pipeline;
the steam booster is arranged on a pipeline between the gas-liquid separator and the steam reheater and is suitable for inputting the steam output by the gas-liquid separator into the steam reheater;
and steam circulates among the falling-film evaporator, the gas-liquid separator and the steam reheater.
Further, a second steam outlet is arranged on the falling film evaporator and connected with a preheating steam coil pipe in the preheating device.
Further, the preheating device comprises
A barrel;
the preheating steam coil is arranged in the barrel, one end of the preheating steam coil is connected with a second steam outlet of the falling film evaporator tube, and the other end of the preheating steam coil is connected with the vacuum buffer tank;
the preheating steam coil is suitable for heating stock solution in the cylinder.
Further, a spray pipe is arranged in the cylinder, a spray hole at the upper end of the spray pipe is positioned on the preheating steam coil pipe, the lower end of the spray pipe is connected with the bottom of the cylinder, a water pump is arranged on the spray pipe, and stock solution in the cylinder is extracted by the water pump.
Further, the steam reheater includes
A housing;
a heating coil disposed within the housing;
the two ends of the heat medium conveying pipe are respectively connected with the heating coil, and the heat medium circularly flows in the heating coil and the heat medium conveying pipe;
and the electromagnetic heating furnace is connected with the heat medium conveying pipe and is suitable for heating the heat medium in the heat medium conveying pipe.
In a second aspect:
the high-mineral desalted water evaporation crystallization device comprises the following steps:
step S01, adding the stock solution into a preheating device for preheating;
s02, inputting the preheated stock solution into a falling film evaporation system, evaporating by a falling film evaporator, and evaporating the stock solution to a saturated or supersaturated state by high-temperature steam;
s03, inputting the stock solution into a stirring crystallizer again for crystallization and stirring to form crystal slurry;
and S04, inputting the crystal slurry into a centrifugal dehydrator for centrifugal separation, and separating out the crystal to obtain a stock solution.
The invention has the beneficial effects that:
compared with multi-effect evaporation, the method has the advantages of short flow, low equipment investment cost and lower energy consumption.
Compared with mechanical forced pressurization (abbreviated as MVR), the method has the advantages of low equipment investment cost, low operation and maintenance cost and energy consumption close to or lower than the MVR.
The adjustment range of the temperature difference is larger when the materials are evaporated, the proper evaporation temperature can be adjusted according to the characteristics of the required crystal separation ions in the materials, the temperature of steam can be controlled as long as the temperature of the heat conduction oil is controlled, so that the adaptability is stronger, multiple concentrated water can be adapted, and the later-stage operation is simple and convenient and the subsequent maintenance cost is reduced.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic view of an evaporative crystallization apparatus for high-mineral desalted water according to the present invention;
FIG. 2 is a falling film evaporation system
FIG. 3 is a schematic view of a stirred crystallizer and centrifugal dehydrator;
FIG. 4 is a schematic view of a preheating device;
wherein the content of the first and second substances,
2. the preheating device 21, the cylinder 22, the preheating steam coil pipe 23 and the spray pipe;
3. a falling film evaporator;
4. a gas-liquid separator;
5. a steam reheater 51, a shell 52, a heating coil 53, a heat medium delivery pipe 54 and an electromagnetic heating furnace;
6. a steam booster;
7. the crystallizer is stirred.
8. A centrifugal dehydrator is arranged in the machine body,
Detailed Description
The invention will now be further described with reference to specific examples. These drawings are simplified schematic diagrams only illustrating the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Example one
As shown in figures 1 to 4, the high-mineral desalted water evaporative crystallization device comprises
The preheating device 2 is suitable for preheating the stock solution;
the falling film evaporation system is connected with the preheating device 2 through a pipeline, and the preheated stock solution enters the falling film evaporation system to be evaporated to a saturated or supersaturated state;
the stirring crystallizer 7 is connected with a water outlet pipeline of the falling film evaporation system and is suitable for stirring the saturated or supersaturated stock solution to form crystal slurry;
and the centrifugal dehydrator is connected with the stirring crystallizer 7 through a pipeline and is suitable for crystallizing and separating the crystal slurry.
In this embodiment, the stirred crystallizer 7 is a crystallization kettle, which is also called a "thick kettle", and the operation mode is adjusted according to the crystal characteristics to rapidly grow and settle the crystals.
Preferably, a return pipe is connected between the water outlet of the centrifugal dehydrator and the water inlet pipe of the preheating device 2, and the return tank can return the liquid discharged from the centrifugal dehydrator to the preheating device 2 again for preheating, and perform recrystallization separation on the return liquid.
As an alternative embodiment of the falling film evaporation system, as shown in fig. 2, the falling film evaporation system comprises
A falling-film evaporator 3, wherein a stock solution inlet at the top of the falling-film evaporator is connected with a preheating device 2 through a pipeline, a water outlet at the bottom of the falling-film evaporator is connected with a stirring crystallizer 7 through a pipeline, a steam inlet of the falling-film evaporator is connected with a steam reheater 5 through a pipeline, and a first steam outlet of the falling-film evaporator is connected with a gas-liquid separator 4 through a pipeline;
the inlet of the gas-liquid separator 4 is connected with the first steam outlet of the falling film evaporator 3, and the outlet of the gas-liquid separator is connected with the inlet pipeline of the steam reheater 5;
the inlet of the steam reheater 5 is connected with the gas-liquid separator 4 through a pipeline, and the outlet of the steam reheater is connected with the falling film evaporator 3 through a pipeline;
a steam booster 6 which is arranged on a pipeline between the gas-liquid separator 4 and the steam reheater 5 and is suitable for inputting the steam output by the gas-liquid separator 4 into the steam reheater 5;
and steam circulates among the falling-film evaporator 3, the gas-liquid separator 4 and the steam reheater 5.
The working principle of the falling film evaporation system is as follows: the raw liquid after being preheated enters the falling-film evaporator 3 and contacts with high-temperature steam input by the steam reheater 5, the raw liquid is evaporated to a saturated or supersaturated state, then the raw liquid is output from the bottom, the rest steam is recycled, one path of steam can be output from the first steam outlet and then enters the gas-liquid separator 4 for gas-liquid separation, the separated steam is input into the steam reheater 5 through the steam supercharger 6 for heating, and the steam flows into the falling-film evaporator 3 from a saturated steam pipeline at the top after being heated to heat the raw liquid.
Specifically, as an alternative embodiment in this embodiment, as shown in fig. 2, the falling film evaporator 3 is provided with a second steam outlet, and the second steam outlet is connected with the preheating steam coil 22 in the preheating device 2.
Specifically, as an optional implementation manner in this embodiment, as shown in fig. 4, the preheating device 2 includes a cylinder 21;
the preheating steam coil 22 is arranged in the barrel 21, one end of the preheating steam coil 22 is connected with a second steam outlet of the falling film evaporator 3 pipe, and the other end of the preheating steam coil 22 is connected with a vacuum buffer tank;
the preheating steam coil 22 is suitable for heating the stock solution in the barrel 21.
The stock solution is input into the cylinder 21, the preheating steam coil 22 heats the stock solution, the temperature of the preheating steam coil 22 is from the temperature of secondary steam output in the tube of the falling film evaporator 3, and the stock solution is preheated by the secondary steam.
Steam and the comdenstion water of high temperature flow into the vacuum buffer tank from preheating the export of steam coil 22 afterbody behind steam coil 22, and the comdenstion water is collected from the vacuum buffer tank bottom, and steam is pumped to the atmosphere through the vacuum pump.
Specifically, as an optional implementation manner in this embodiment, as shown in fig. 4, a spraying pipe 23 is disposed in the cylinder 21, spraying holes at the upper end of the spraying pipe 23 are located in the preheating steam coil 22, the lower end of the spraying pipe 23 is connected to the bottom of the cylinder 21, a water pump is disposed on the spraying pipe 23, and the stock solution in the cylinder 21 is pumped by the water pump.
The stock solution is uniformly sprayed on the preheating steam coil 22 through the spraying pipe 23, so that the stock solution can be uniformly heated more quickly.
Specifically, as an alternative implementation manner in this embodiment, as shown in fig. 2, the steam reheater 5 includes a casing 51;
a heating coil 52 disposed within the housing 51;
a heat medium delivery pipe 53 having both ends connected to the heating coil 52, respectively, the heat medium circulating in the heating coil 52 and the heat medium delivery pipe 53;
and an electromagnetic heating furnace 54 connected to the heat medium delivery pipe 53 and adapted to heat the heat medium in the heat medium delivery pipe 53.
In this embodiment, the heat medium circulating in the heat medium delivery pipe 53 adopts heat conduction oil, the electromagnetic heating furnace 54 heats the heat conduction oil in the heat medium delivery pipe 53, the heated heat conduction oil enters the heating coil 52, the heating coil 52 heats the steam in the shell 51, the heat conduction oil continuously circulates between the heating coil 52 and the heat medium delivery pipe 53, and the steam circulating in the shell 51 is continuously heated.
Example two
A method for treating high-mineral desalted water, which adopts the high-mineral desalted water evaporative crystallization device in the first embodiment, comprises the following steps:
step S01, adding stock solution (high-mineral desalted water) into a preheating device 2 for preheating;
s02, inputting the preheated stock solution into a falling film evaporation system, evaporating by a falling film evaporator 3, and evaporating the stock solution to a saturated or supersaturated state by high-temperature steam;
step S03, inputting the stock solution into a stirring crystallizer 7 again for crystallization and stirring to form crystal slurry;
and S04, inputting the crystal slurry into a centrifugal dehydrator for centrifugal separation, and separating out the raw liquid from the crystals.
The separated stock solution can be returned to the cylinder 21 of the preheating device 2 again through a return pipe for evaporation and crystallization again.
The high-mineral desalted water evaporation crystallization device has the advantages of short raw liquid evaporation crystallization process, low equipment investment cost, lower energy consumption, larger process adjustment range required by materials, stronger adaptability, simple and convenient later operation and low subsequent maintenance cost.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (7)
1. A high-mineral desalted water evaporation crystallization device is characterized by comprising
The preheating device is suitable for preheating the stock solution;
the falling film evaporation system is connected with the preheating device through a pipeline, and the preheated stock solution enters the falling film evaporation system to be evaporated to a saturated or supersaturated state;
the stirring crystallizer is connected with a water outlet pipeline of the falling film evaporation system and is suitable for stirring the saturated or supersaturated stock solution to form crystal slurry;
and the centrifugal dehydrator is connected with the pipeline of the stirring crystallizer and is suitable for crystallizing and separating the crystal slurry.
2. The evaporative crystallization apparatus for high-mineral desalted water according to claim 1,
the falling film evaporation system comprises
A raw liquid inlet at the top of the falling-film evaporator is connected with a preheating device pipeline, a water outlet at the bottom of the falling-film evaporator is connected with a stirring crystallizer pipeline, a steam inlet of the falling-film evaporator is connected with a steam reheater pipeline, and a first steam outlet of the falling-film evaporator is connected with a gas-liquid separator pipeline;
the inlet of the gas-liquid separator is connected with the first steam outlet of the falling film evaporator, and the outlet of the gas-liquid separator is connected with the inlet pipeline of the steam reheater;
the inlet of the steam reheater is connected with the gas-liquid separator through a pipeline, and the outlet of the steam reheater is connected with the falling film evaporator through a pipeline;
the steam booster is arranged on a pipeline between the gas-liquid separator and the steam reheater and is suitable for inputting the steam output by the gas-liquid separator into the steam reheater;
and steam circulates among the falling-film evaporator, the gas-liquid separator and the steam reheater.
3. The evaporative crystallization apparatus for high-mineral desalted water according to claim 2,
and a second steam outlet is arranged on the falling film evaporator and is connected with a preheating steam coil in the preheating device.
4. The evaporative crystallization apparatus for high-mineral desalted water according to claim 1,
the preheating device comprises
A barrel;
the preheating steam coil is arranged in the barrel, one end of the preheating steam coil is connected with a second steam outlet of the falling film evaporator tube, and the other end of the preheating steam coil is connected with the vacuum buffer tank;
the preheating steam coil is suitable for heating stock solution in the cylinder.
5. The evaporative crystallization apparatus for high-mineral desalted water according to claim 4,
and a spray pipe is arranged in the cylinder, a spray hole at the upper end of the spray pipe is positioned on the preheating steam coil pipe, the lower end of the spray pipe is connected with the bottom of the cylinder, a water pump is arranged on the spray pipe, and the stock solution in the cylinder is extracted by the water pump.
6. The evaporative crystallization apparatus for high-mineral desalted water according to claim 2,
the steam reheater comprises
A housing;
a heating coil disposed within the housing;
the two ends of the heat medium conveying pipe are respectively connected with the heating coil, and the heat medium circularly flows in the heating coil and the heat medium conveying pipe;
and the electromagnetic heating furnace is connected with the heat medium conveying pipe and is suitable for heating the heat medium in the heat medium conveying pipe.
7. A method for treating high-mineral desalted water, which is characterized in that the evaporation crystallization device of the high-mineral desalted water disclosed by any one of claims 1 to 6 is adopted, and comprises the following steps:
step S01, adding the stock solution into a preheating device for preheating;
s02, inputting the preheated stock solution into a falling film evaporation system, evaporating by a falling film evaporator, and evaporating the stock solution to a saturated or supersaturated state by high-temperature steam;
step S03, inputting the stock solution into a stirring crystallizer again for crystallization and stirring, and stirring to form crystal slurry;
and S04, inputting the crystal slurry into a centrifugal dehydrator for centrifugal separation, and separating out the raw liquid from the crystals.
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