CN117185389A

CN117185389A - Concentrated crystallization desalination water treatment facilities of high salt waste water will contain through lithium bromide unit

Info

Publication number: CN117185389A
Application number: CN202011494148.7A
Authority: CN
Inventors: 徐宝安
Original assignee: Zibo Environmental Protection Technology Co ltd
Current assignee: Zibo Environmental Protection Technology Co ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2023-12-08
Also published as: WO2022126671A1

Abstract

The device for concentrating, crystallizing and desalinating the high-salt-content wastewater by the lithium bromide unit comprises the lithium bromide unit, a strong brine evaporating chamber and a water vapor condensing chamber, and the device for crystallizing and desalinating the strong brine by hot air evaporation. The hot circulating water heated by the lithium bromide unit absorber and the condenser is used as a heat source to heat the strong brine and the air, so that the cooling of the hot circulating water of the lithium bromide unit is formed, and the hot circulating water is used as a heat source for evaporating, concentrating and crystallizing the strong brine. The cooled circulating water is heated by the absorber and condenser means to form a circulation. The refrigerant circulating water cooled by the lithium bromide unit is used as a condensing cold source for spraying the evaporated water vapor. And the refrigerant circulating water with heat absorption and temperature rise enters the lithium bromide unit evaporation device to release heat and cool, and then is input into the water vapor condensation chamber to condense negative pressure vapor in the water vapor condensation chamber. The air heater heats air by the air guiding fan, and the hot air evaporates strong brine raised by the spraying and water raising device, so that the concentration of the strong brine is increased due to evaporation, and finally, crystalline salt is generated.

Description

Concentrated crystallization desalination water treatment facilities of high salt waste water will contain through lithium bromide unit

Technical Field

The invention belongs to the field of high-salt-content water treatment technology and environmental protection, and particularly relates to a device for concentrating, crystallizing and desalting high-salt-content wastewater by a lithium bromide unit.

Background

Along with the acceleration of the industrialization progress in China, various industrial and mining production fields can generate high-salt wastewater, such as high-salt wastewater discharged by thermal power plants, printing and dyeing, papermaking, chemical industry, pesticide, oil extraction, marine product processing and the like. The salt content of the wastewater is higher due to gradual concentration of the salt in the process water, and if the wastewater cannot be well treated, the wastewater and the soil are inevitably polluted. Therefore, the economic and efficient concentration treatment of the high-salinity brine becomes a key problem of the economical and feasible liquid zero-discharge process. Such waste water usually contains high concentration organic pollutants, and the direct discharge causes serious pollution and damage to the environment, for example, the high salt waste water seeps into a soil system, so that soil organisms and plants die due to dehydration, and the soil ecological system is broken down. Moreover, the high-salinity wastewater generally contains other high-concentration organic matters or nutrients, and if the high-salinity wastewater is directly discharged without treatment, the high-salinity wastewater brings greater pressure to the water environment and accelerates the eutrophication process of rivers and lakes. Although no statistical data exists in the aspect of salt-containing industrial wastewater at present, it is confirmed that with the development of industry and the shortage of water resources, the pollution concentration of high-salt production wastewater generated by some industrial industries is higher and higher, the components are more and more complex, the discharge amount is larger and the environmental pressure is also higher and higher. Therefore, research on high-salinity industrial wastewater treatment technologies is urgent, and the exploration of effective high-salinity organic wastewater treatment technologies has become one of the hot spots of current wastewater treatment.

The main salt components of the high-salt wastewater are sodium sulfate and sodium chloride systems, the existing high-salt wastewater treatment mode mainly separates waste salt from water through evaporation crystallization, the evaporation crystallization generally adopts a multi-effect evaporation or MVR evaporation crystallizer, the evaporation crystallization of one ton of water by the multi-effect evaporator consumes a large amount of steam, three-effect evaporation crystallization is taken as an example, one ton of water is evaporated and crystallized, more than 60 yuan of cost is needed, the operation cost is high, great economic pressure is caused for enterprises, the MVR evaporation crystallization device evaporates one ton of high-salt wastewater, the needed electric energy consumption is at least 45 DEG, and the overall needed electric energy consumption is about 30 multi-ton of water treatment cost, although the treatment cost is much lower than the multi-effect evaporation treatment cost, the energy consumption still is difficult for the enterprises to bear, and how to find an evaporation crystallization device with low cost and reasonable investment is the serious problem of reducing the operation cost of evaporation crystallization in China.

The industrial desalting treatment technology for salt-containing water mainly comprises reverse osmosis method, multi-stage flash evaporation, multi-effect distillation method and the like. The utility model patent CN103342432B 'a near-zero discharge process of salt-containing wastewater' discloses a near-zero discharge process of salt-containing wastewater, and the main processes comprise pretreatment, electric adsorption, ultrafiltration, reverse osmosis, electrodialysis and evaporative crystallization. The reverse osmosis concentrated water is used as electrodialysis raw material, the electrodialysis water-producing concentrated brine is subjected to evaporation crystallization treatment, the produced fresh water enters a water supply system, and the comprehensive recovery rate of water can reach 99.5%. The utility model patent CN 104016529B discloses a method for treating salt-containing wastewater in coal chemical industry based on a multistage countercurrent reversed-pole electrodialyzer, which comprises the steps of ozone catalytic oxidation multi-medium filtration and membrane filtration of the multistage countercurrent reversed-pole electrodialyzer, so that the advanced treatment and desalination recycling of the salt-containing wastewater in coal chemical industry are realized. The utility model patent CN205011538U is a low-energy consumption coal chemical industry concentrated brine fractional crystallization combined device, which is formed by combining a plurality of devices such as hardness removal softening, NF separation membrane, high-salt reverse osmosis, produced water/concentrated water ED membrane concentration, produced water/concentrated water evaporative crystallization, produced water/concentrated jellyfish drier, AOP catalytic oxidation, active carbon filtration and the like, thereby realizing the full recycling of the coal chemical industry concentrated brine. The utility model patent CN201520882324.2 discloses a treatment system of high-salt wastewater in coal chemical industry, which utilizes an electrodialysis and reverse osmosis coupling process consisting of a nanofiltration membrane filter, an ion membrane reactor and a reverse osmosis filter to treat the high-salt wastewater in coal chemical industry.

From the above, brine concentration by electrodialysis and reverse osmosis followed by salt separation and crystallization have become important schemes for industrial high-salt water treatment. The high-salt wastewater has the characteristic of high hardness, the electrodialysis process in the prior art adopts an inverse electrodialyzer or nanofiltration pretreatment to reduce the possibility of scaling on the surface of a membrane on the electrodialysis concentrate side, but the inverse electrodialyzer in the method needs a complex pipeline and a control system, and reduces the recovery rate of water in an electrodialysis system; on one hand, new treatment equipment is added by taking nanofiltration as pretreatment, and meanwhile, the nanofiltration membrane still has the scaling problem, so that the recovery rate of the system is lower; while some of the disclosed techniques treat electrodialysis fresh water to a lesser extent as process fresh water, increasing the cost of the electrodialysis treatment. There are also forms of electrodialysis desalted water recycle concentration that are simple to use, but increase the risk of concentration such as hardness.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the device for concentrating, crystallizing and desalting the high-salt-content wastewater by using the lithium bromide unit, which has the advantages of good treatment effect, simple process flow, stable operation and suitability for the treatment of most industrial high-salt-content water.

The device comprises a single-effect lithium bromide unit, a brine negative pressure evaporation concentration condenser serving as a desalting device and a hot air evaporation brine crystallization brine-containing device, and is characterized in that: the concentrated lithium bromide solution in the absorber of the single-effect lithium bromide unit absorbs the water vapor evaporated by the evaporator and then heats up and cools down through circulating water.

The cooled diluted lithium bromide solution is pressurized by a solution pump, enters a generator through a heat exchanger, is heated and concentrated by a heat source, enters an absorber after being cooled by the heat exchanger, and completes solution circulation. The water vapor generated by boiling and concentrating the dilute lithium bromide solution of the generator enters a condenser to be cooled by circulating water to release heat and condense.

The refrigerant water formed by condensation enters an evaporator after being throttled and decompressed, and is evaporated, the heat in the cold water is absorbed to cool the cold water, and the cold water emits heat, so that the purpose of refrigeration is achieved. And the refrigerant vapor formed by evaporation enters the absorber again to be absorbed by the concentrated solution to form a dilute solution, thus completing the refrigerant circulation.

And the heat circulating water heated by the absorber and the condenser of the single-effect lithium bromide unit is used as a heat source. The heat circulation water heater of the single-effect lithium bromide unit is at least two stages, wherein one stage is for heating the strong brine, and the other stage is for heating air, so that the heat circulation water of the single-effect lithium bromide unit is cooled and used as a heat source for evaporating, concentrating and crystallizing the strong brine. The cooled single-effect lithium bromide unit heat circulating water is heated by an absorber and a condenser device to form circulation. And the refrigerant circulating water evaporated and cooled by the evaporator of the single-effect lithium bromide unit is used as a condensation cold source for spraying and evaporating the water vapor condensation water chamber.

And the refrigerant circulating water with heat absorption and temperature rise enters a single-effect lithium bromide unit evaporation device to release heat and cool, and then is input into a water vapor condensation chamber. The cold circulating water heat exchanger of the single-effect lithium bromide unit is at least one stage and condenses the negative pressure steam in the steam condensing chamber. The condensing circulating water heat exchanger of the single-effect lithium bromide unit absorbs the heat of water vapor, and provides the heat of coolant water evaporation for the single-effect lithium bromide unit, so that the single-effect lithium bromide unit has high-efficiency thermal circulation.

The negative pressure evaporating, concentrating, condensing and desalting device for salt-containing water connected by a single-effect lithium bromide unit comprises a salt-containing water evaporating chamber and a water vapor condensing chamber which are isolated and communicated with each other through a partition plate and a water receiver, or two independent chambers which are communicated through a pipeline communicating vessel. The top of the strong brine evaporation chamber is provided with a hot strong brine spray evaporation device. The bottom of the strong brine evaporating chamber is provided with a strong brine collecting tank, the strong brine collecting tank is connected with a strong brine discharge pipe and a strong brine circulating water outlet pipe, and the strong brine discharge pipe and the strong brine circulating water outlet pipe are connected by a same pipe and are connected in a split way through a three-way pipe fitting. The strong brine circulating water outlet pipe is mixed with newly-fed strong brine, the newly-fed strong brine is pumped into a strong brine heater through a strong brine circulating pump to be heated, and the heated strong brine is connected with a strong brine spray evaporation device at the top of a strong brine evaporation chamber through a pipeline. And (3) inputting the concentrated brine into a spraying device in the concentrated brine evaporator, and spraying and evaporating the concentrated brine.

The upper parts of the two chambers are provided with separating sections which are used as isolating devices through water collectors, and the separating sections of the water collectors are used for converging the recovered saline water into a saline water pond at the bottom of the saline water evaporating chamber. The condensing heat exchanger device of the single-effect lithium bromide unit is arranged in a condensed water chamber communicated with the negative pressure chamber, and condensed water is obtained by condensing vapor evaporated in the strong brine evaporation chamber.

The vacuum exhaust pipe is arranged in the water vapor condensing chamber, and the vacuum pumping device is used for vacuumizing the water vapor condensing chamber and the strong brine evaporating chamber, so that the evaporating temperature of the strong brine is reduced.

The strong brine is subjected to hard removal treatment, so that temporary hard and permanent hard calcium carbonate salt which is easy to scale, calcium sulfate salt and magnesium carbonate salt which are easy to scale are removed in the strong brine, and are released in advance, and are converted into sodium sulfate salt, sodium nitrate salt and sodium chloride salt which are difficult to scale, so that the heat exchange surface is not scaled in the concentration process, and even if crystals are generated, the strong brine can be dissolved and removed by dilution.

And the water collector separates the strong brine evaporation chamber from the water vapor condensation chamber, and the recovered salt-containing water is converged into a strong brine pond at the bottom of the strong brine evaporation chamber. The refrigerant heat exchanger of the single-effect lithium bromide unit is arranged in the water vapor condensation chamber, the water vapor generated by the spray evaporation of the strong brine is collected by the water collector and then enters the water vapor condensation chamber provided with the refrigerant heat exchanger of the single-effect lithium bromide unit, the water vapor is condensed on the surface of the evaporator to generate condensed water flow, and the condensed water flow is collected in a water collecting tank at the bottom of the refrigerant heat exchanger of the single-effect lithium bromide unit and pumped out by a water pump.

The hot air evaporating strong brine crystallization salt-containing device of the high salt-containing wastewater concentration crystallization desalination water treatment device comprises an air heater, a induced fan, a strong brine sprayer, a strong brine water lifting device, a strong brine pond, a strong brine water receiving device, a wind chimney or an induced draft fan. The strong brine discharge pipe of the strong brine evaporation chamber is connected with a strong brine sprayer of a hot air evaporation strong brine crystallization salt-containing device through a water pump. The air heater heats the air by the induced fan, and the hot air evaporates the strong brine sprayed and raised by the water heater, so that the strong brine is crystallized. The concentrated brine sprayed by the water spraying machine is evaporated to increase the concentration, and finally crystalline salt is generated, and the salt can be recycled.

The hot circulating water of the single-effect lithium bromide unit is led into a strong brine heater to heat strong brine, the heat of the hot circulating water is released at a high temperature Duan Bufen, then the hot circulating water is led into an air heat exchanger to heat the air introduced by a fan, and the air heated by the air heat exchanger enters a strong brine evaporation pond formed by a spraying device and a water lifting device which are connected through the strong brine pump to evaporate the strong brine, so that the strong brine is evaporated and crystallized. The hot and humid air with brine is discharged into the atmosphere through a wind chimney or a draught fan after the hot and humid air is intercepted by the strong brine collector. The hot and humid air containing evaporated water vapor is made to diffuse and evaporate by convection by utilizing the difference of specific gravity of the hot and cold air by a fan or a wind chimney device.

The single-effect lithium bromide unit is used as a heat source, can realize high efficiency and energy conservation, evaporates water, realizes zero discharge of strong brine, prevents the saline-alkali pollution caused by the strong brine to natural water, prevents land irrigation salinization caused by the strong brine, and can furthest utilize water resources.

The device for concentrating, crystallizing and desalinating the high-salt-content wastewater by the lithium bromide unit comprises a single-effect lithium bromide unit and a salt-containing water negative pressure evaporation concentration condenser which is used as a desalinating device and a hot air evaporation salt-containing water crystallization device. The concentrated lithium bromide solution in the absorber of the single-effect lithium bromide unit absorbs the water vapor evaporated by the evaporator and then heats up and cools down through circulating water.

And the heat circulating water heated by the absorber and the condenser of the single-effect lithium bromide unit is used as a heat source. The heat circulation water heater of the single-effect lithium bromide unit is three-stage, the first stage heats the strong brine, the second stage heats the sprayed strong brine secondarily, the third stage heats the air, and the heat circulation water of the single-effect lithium bromide unit is cooled and used as a heat source for evaporating, concentrating and crystallizing the strong brine. The cooled single-effect lithium bromide unit heat circulating water is heated by an absorber and a condenser device to form circulation. And the refrigerant circulating water evaporated and cooled by the evaporator of the single-effect lithium bromide unit is used as a condensation cold source for spraying and evaporating the water vapor condensation water chamber.

The negative pressure evaporating, concentrating, condensing and desalting device for salt-containing water connected by a single-effect lithium bromide unit comprises a salt-containing water evaporating chamber and a water vapor condensing chamber which are isolated and communicated with each other through a partition plate and a water receiver, or two independent chambers which are communicated through a pipeline communicating vessel. The top of the strong brine evaporation chamber is provided with a hot strong brine spray evaporation device. Meanwhile, a strong brine spray heater is arranged in the strong brine evaporation chamber and is used as a strong brine secondary heating evaporation device.

The bottom of the strong brine evaporating chamber is provided with a strong brine collecting tank, the strong brine collecting tank is connected with a strong brine discharge pipe and a strong brine circulating water outlet pipe, and the strong brine discharge pipe and the strong brine circulating water outlet pipe are connected by a same pipe and are connected in a split way through a three-way pipe fitting. The strong brine circulating water outlet pipe is mixed with newly-fed strong brine, the newly-fed strong brine is pumped into a strong brine heater through a strong brine circulating pump to be heated, and the heated strong brine is connected with a strong brine spray evaporation device at the top of a strong brine evaporation chamber through a pipeline. And (3) inputting the concentrated brine into a spraying device in the concentrated brine evaporator, and spraying and evaporating the concentrated brine.

The device for concentrating, crystallizing and desalinating the high-salt-content wastewater by the lithium bromide unit comprises a double-effect lithium bromide unit and a salt-containing water negative pressure evaporation concentration condenser which are used as desalination devices and a hot air evaporation strong salt-containing water crystallization salt-containing device. The concentrated lithium bromide solution in the absorber of the double-effect lithium bromide unit absorbs the water vapor evaporated by the evaporator and then heats up and cools down through circulating water. The dilute solution in the absorber is pressurized by the solution pump, enters the high-pressure generator through the low-temperature heat exchanger and the high-temperature heat exchanger, is heated and concentrated by the heat source, and the concentrated intermediate solution enters the low-pressure generator after entering the high-temperature heat exchanger, is heated and concentrated by the refrigerant steam from the high-pressure generator, and the concentrated solution enters the absorber after passing through the low-temperature heat exchanger to complete the solution circulation.

The water vapor generated by boiling and concentrating the dilute lithium bromide solution of the low-pressure generator enters a condenser and is cooled by circulating water to release heat for condensation.

The solution in the high-pressure generator is heated, the generated first-effect refrigerant steam enters the low-pressure generator and is used as a heat source to heat the solution in the low-pressure generator, the generated second-effect refrigerant steam enters the condenser, the first-effect refrigerant steam forms a mixture of the refrigerant steam and the refrigerant water in the low-pressure generator, the mixture flows into the condenser after being throttled and decompressed, and the first-effect refrigerant steam and the second-effect refrigerant steam are condensed together by cooling water. The refrigerant water formed by condensation enters an evaporator after being throttled and decompressed, and is evaporated, the heat in the cold water is absorbed to cool the cold water, and the cold water emits heat, so that the purpose of refrigeration is achieved. And the refrigerant vapor formed by evaporation enters the absorber again to be absorbed by the concentrated solution to form a dilute solution, thus completing the refrigerant circulation.

And the hot circulating water heated by the absorber and the condenser of the double-effect lithium bromide unit is used as a heat source. The heat circulation water heater of the double-effect lithium bromide unit is at least two stages, wherein one stage is for heating the strong brine, and the other stage is for heating air, so that the heat circulation water of the double-effect lithium bromide unit is cooled and used as a heat source for evaporating, concentrating and crystallizing the strong brine. The cooled double-effect lithium bromide unit heat circulating water is heated by an absorber and a condenser to form circulation. The refrigerant circulating water evaporated and cooled by the evaporator of the double-effect lithium bromide unit is used as a condensing cold source for spraying and evaporating a water vapor condensing water chamber.

And the refrigerant circulating water with heat absorption and temperature rise enters the double-effect lithium bromide unit evaporation device to release heat and cool, and then is input into the water vapor condensation chamber. The cold circulating water heat exchanger of the double-effect lithium bromide unit is at least one stage and condenses the negative pressure steam in the steam condensing chamber. The condensing circulating water heat exchanger of the double-effect lithium bromide unit absorbs the heat of the water vapor, and provides the heat generating capacity of the coolant water vapor for the double-effect lithium bromide unit, so that the double-effect lithium bromide unit has high-efficiency thermal circulation.

The negative pressure evaporating, concentrating, condensing and desalting device for salt-containing water connected by the double-effect lithium bromide unit comprises a salt-containing water evaporating chamber and a water vapor condensing chamber which are isolated and communicated with each other through a partition plate and a water receiver, or two independent chambers which are communicated through a pipeline communicating vessel. The top of the strong brine evaporation chamber is provided with a hot strong brine spray evaporation device. The bottom of the strong brine evaporating chamber is provided with a strong brine collecting tank, the strong brine collecting tank is connected with a strong brine discharge pipe and a strong brine circulating water outlet pipe, and the strong brine discharge pipe and the strong brine circulating water outlet pipe are connected by a same pipe and are connected in a split way through a three-way pipe fitting. The strong brine circulating water outlet pipe is mixed with newly-fed strong brine, the newly-fed strong brine is pumped into a strong brine heater through a strong brine circulating pump to be heated, and the heated strong brine is connected with a strong brine spray evaporation device at the top of a strong brine evaporation chamber through a pipeline. And (3) inputting the concentrated brine into a spraying device in the concentrated brine evaporator, and spraying and evaporating the concentrated brine.

The upper parts of the two chambers are provided with separating sections which are used as isolating devices through water collectors, and the separating sections of the water collectors are used for converging the recovered saline water into a saline water pond at the bottom of the saline water evaporating chamber. The double-effect lithium bromide unit condensation heat exchanger device is arranged in a condensed water chamber communicated with the negative pressure chamber, and condensed water is obtained by condensing vapor evaporated in the strong brine evaporation chamber.

And the water collector separates the strong brine evaporation chamber from the water vapor condensation chamber, and the recovered salt-containing water is converged into a strong brine pond at the bottom of the strong brine evaporation chamber. The refrigerant heat exchanger of the double-effect lithium bromide unit is arranged in a water vapor condensing chamber, water vapor generated by spraying and evaporating strong brine enters the water vapor condensing chamber provided with the refrigerant heat exchanger of the double-effect lithium bromide unit after the water mist is collected by a water collector, the water vapor is condensed on the surface of an evaporator to generate condensed water flow, and the condensed water flow is collected in a water collecting tank at the bottom of the refrigerant heat exchanger of the double-effect lithium bromide unit and pumped out by a water pump.

The hot circulating water of the double-effect lithium bromide unit is led into a strong brine heater to heat strong brine, the heat of the hot circulating water is released at a high temperature Duan Bufen, then the hot circulating water is led into an air heat exchanger to heat the induced air of a fan, and the air heated by the air heat exchanger enters a strong brine evaporation pond formed by a spraying device and a water lifting device which are connected through the strong brine pump to evaporate the strong brine, so that the strong brine is evaporated and crystallized. The hot and humid air with brine is discharged into the atmosphere through a wind chimney or a draught fan after the hot and humid air is intercepted by the strong brine collector. The hot and humid air containing evaporated water vapor is made to diffuse and evaporate by convection by utilizing the difference of specific gravity of the hot and cold air by a fan or a wind chimney device.

The double-effect lithium bromide unit is used as a heat source, can realize high efficiency and energy conservation, evaporates water, realizes zero discharge of strong brine, prevents the saline-alkali pollution caused by the strong brine to natural water, prevents land irrigation salinization caused by the strong brine, and can furthest utilize water resources.

And the hot circulating water heated by the absorber and the condenser of the double-effect lithium bromide unit is used as a heat source. The heat circulation water heater of the double-effect lithium bromide unit is three-stage, the first stage heats the strong brine, the second stage heats the sprayed strong brine secondarily, the third stage heats the air, and the heat circulation water of the double-effect lithium bromide unit is cooled and used as a heat source for evaporating, concentrating and crystallizing the strong brine. The cooled double-effect lithium bromide unit heat circulating water is heated by an absorber and a condenser to form circulation. The refrigerant circulating water evaporated and cooled by the evaporator of the double-effect lithium bromide unit is used as a condensing cold source for spraying and evaporating a water vapor condensing water chamber.

The negative pressure evaporating, concentrating, condensing and desalting device for salt-containing water connected by the double-effect lithium bromide unit comprises a salt-containing water evaporating chamber and a water vapor condensing chamber which are isolated and communicated with each other through a partition plate and a water receiver, or two independent chambers which are communicated through a pipeline communicating vessel. The top of the strong brine evaporation chamber is provided with a hot strong brine spray evaporation device. Meanwhile, a strong brine spray heater is arranged in the strong brine evaporation chamber and is used as a strong brine secondary heating evaporation device.

The concentrated crystallization desalination water treatment device for the high-salt-content wastewater through the lithium bromide unit comprises a concentrated salt water receiver which comprises a folded plate type and a passive fan type.

The concentrated crystallization desalination water treatment device for the high-salt-content wastewater is arranged in a wind chimney or is provided with a cold air introducing device, condenses vapor in wet air and recovers condensate water.

The water treatment device for concentrating, crystallizing and desalting the high-salt-content wastewater by the lithium bromide unit is arranged in a wind chimney or provided with an air secondary evaporator of the lithium bromide unit, and condenses the vapor in the hot and humid air and recovers the condensed water.

The concentrated crystallization desalination water treatment device for the high-salt-content wastewater is characterized in that the concentrated brine is the concentrated brine which is subjected to chemical hardening removal treatment and mainly contains sodium salt, and the main softening medicine of the concentrated brine is sodium carbonate. Or the strong brine is the strong brine which is subjected to physical heating and hardness removal treatment and mainly contains sodium salt, and the physical hardness removal of the strong brine is to heat the strong brine mixed with the grit abrasive to 125 ℃ for hardness removal through a heat exchanger and a final-stage heater.

The evaporation device of the lithium bromide unit is a secondary evaporation device of the primary lithium bromide unit, the steam evaporated by negative pressure is condensed, and the evaporation device of the secondary lithium bromide unit is used for partially condensing damp and hot air discharged by an induced draft fan and recycling condensed water.

The vacuum pumping device comprises a vacuum pump, a water ring vacuum pump, a mechanical vacuum pump and a steam jet vacuum pump, wherein the vacuum pump consists of a condensed water suction pump and a jet water air extractor.

The beneficial effects of the invention are as follows:

the high-salt-content wastewater concentration crystallization desalination water treatment device utilizes the high energy efficiency ratio of the lithium bromide unit to realize concentration of strong brine, preparation of condensed water and concentration crystallization of the high-salt-content wastewater, realizes zero emission of the strong brine, furthest recovers water resources and furthest utilizes low-grade heat energy. The device for concentrating, crystallizing and desalinating the high-salt-content wastewater by the lithium bromide unit has reliable performance, high energy efficiency and high utilization rate of the high-salt-content wastewater.

Drawings

The invention will be further described with reference to the drawings and examples.

FIG. 1 shows a schematic diagram of a first embodiment of a combined system of a water treatment device for concentrating, crystallizing and desalinating high-salinity wastewater by a lithium bromide unit;

FIG. 2 shows a schematic diagram of a second embodiment of the combined system of the water treatment device for concentrating, crystallizing and desalinating high-salinity wastewater by a lithium bromide unit;

FIG. 3 shows a schematic diagram of a third embodiment of a combined system of a water treatment device for concentrating, crystallizing and desalinating high-salinity wastewater by a lithium bromide unit;

FIG. 4 shows a schematic diagram of a fourth embodiment of the combined system of the water treatment device for concentrating, crystallizing and desalinating high-salinity wastewater by a lithium bromide unit;

FIG. 5 shows a schematic diagram of a fifth embodiment of the combined system of the water treatment device for concentrating, crystallizing and desalinating high-salinity wastewater by a lithium bromide unit;

FIG. 6 shows a schematic diagram of a sixth embodiment of a combined system of a water treatment device for concentrating, crystallizing and desalinating high-salinity wastewater by a lithium bromide unit;

FIG. 7 shows a schematic diagram of a seventh embodiment of a combined system of a water treatment device for concentrating, crystallizing and desalinating high-salinity wastewater by a lithium bromide unit;

FIG. 8 shows a schematic diagram of an eighth embodiment of a combined system of a water treatment device for concentrating, crystallizing and desalinating high-salinity wastewater by a lithium bromide unit;

FIG. 9 shows a schematic diagram of a ninth embodiment of the combined system of the water treatment device for concentrating, crystallizing and desalinating high-salinity wastewater by a lithium bromide unit;

FIG. 10 shows a schematic view of a tenth embodiment of the combined system of the water treatment apparatus for concentrating, crystallizing and desalinating high-salinity wastewater by a lithium bromide unit;

FIG. 11 shows a schematic view of an eleventh embodiment of a combined system of a water treatment device for concentrating, crystallizing and desalinating high-salinity wastewater by a lithium bromide unit;

fig. 12 shows a schematic diagram of a twelfth embodiment of the combined system of the water treatment device for concentrating, crystallizing and desalinating high-salt-containing wastewater by a lithium bromide unit.

In the figure: 1 a water lifting device, 2 a water lifting device bracket, 3 an air cooling heat exchanger, 4 a fan, 5 a motor, 6 a circulating water pipeline, 7 a concentrated water spray device, 8 a concentrated water inlet pipe, 9 a concentrated water spray pump, 10 a concentrated water mixing adjustment three-way valve, 11 a concentrated water discharge pipe, 12 a concentrated water circulating water pump, 13 a concentrated water storage pool, 14 a concentrated water heater heat exchanger coil pipe, 15 a water receiver, 16 a concentrated water spray evaporator, 17 a concentrated water spray pipe, 18 a high temperature circulating water pipe, 19 a circulating water pump, 20 a circulating water tank, 21 a refrigerant vapor condenser, 22 an absorber coil pipe, 23 an absorber, 24 a circulating water cooling coil pipe, 25 a condensed water output pipe, 26 a vapor condenser, 27 a condensed water delivery pump, 28 an air intake and exhaust device 29 condensate water tank, 30 condensate water collector, 31 vacuum exhaust pipe, 32 condensate water pump, 33 ejector, 34 wind chimney, 35 water collector, 36 concentrated water evaporation pool, 37 evaporator, 38 cold circulating water expansion tank, 39 cold circulating water coil pipe, 40 solution pump, 41 coolant water pump, 42 lithium bromide solution heat exchanger, 43 heat source heater coil pipe, 44 generator, 45 cold circulating water pump, 46 fan bracket, 47 cold wind inlet sleeve pipe, 48 fan, 49 recovery condensate water tank, 50 wet hot air cooler, 51 wet air condensate water collector, 52 concentrated water spray secondary heating coil pipe, 53 low efficiency generator heating coil pipe, 54 low efficiency generator, 55 lithium bromide solution high efficiency heat exchanger.

The specific embodiment is as follows:

as shown in fig. 1:

the generator 44 of the single-effect lithium bromide unit generates steam after being heated by the heat source heater coil 43, enters the refrigerant steam condenser 21 through a pipeline, the temperature of the circulating water cooling coil 24 is increased after being heated by the steam of the refrigerant steam condenser 21, enters the concentrated water heater heat exchanger coil 14 for heat release, then enters the air cooling heat exchanger 3 for further heat release, is discharged to the circulating water tank 20, the water in the circulating water tank 20 is pumped out through the circulating water pipeline 6 by the circulating water pump 19, the absorber coil 22 in the absorber 23 absorbs heat, the water enters the refrigerant steam condenser 21 through the pipeline, and the circulating water cooling coil 24 absorbs heat to form circulation.

After the lithium bromide solution in the absorber 23 enters the lithium bromide solution heat exchanger 42 through the solution pump 40 to exchange heat, the lithium bromide solution enters the generator 44 through the pipe, the lithium bromide solution in the generator 44 boils to generate steam, the steam enters the refrigerant steam condenser 21, the concentrated solution enters the lithium bromide solution heat exchanger 42 to release heat, and the concentrated solution enters the absorber 23 through the spraying device to spray and absorb heat. The refrigerant water in the refrigerant water vapor condenser 21 enters the evaporator 37 through a pipeline, and is sprayed and evaporated by the refrigerant water pump 41 to absorb heat, and the cold circulating water in the cold circulating water coil 39 is cooled.

The sprayed coolant water circulates through the coolant pump 41 and the spray device in the evaporator 37. The cold circulating water cooled by the cold circulating water coil 39 enters the cold circulating water expansion tank 38, is pumped into the water vapor condenser 26 by the cold circulating water pump 45 to absorb heat and condense the evaporated vapor, and the cold circulating water after absorbing heat enters the cold circulating water coil 39 in the evaporator 37 to cool and release heat, and forms circulation by the cold circulating water pump 45. The condensed water is vacuumized by a condensed water pump 32 through an ejector 33 and a vacuum exhaust pipe 31, then enters a condensed water tank 29, an air inlet and exhaust device 28 is arranged on the condensed water tank 29, and the condensed water is pumped out by a condensed water pump 27. The strong brine is converged with the supplemented strong brine water inlet pipe 8 through the strong brine discharge pipe 11, mixed by the strong brine mixing adjustment three-way valve 10, pumped into the heat exchanger through the strong brine circulating water pump 12, heated by the strong water heater heat exchanger coil 14, and sprayed for heat release through the strong brine spray pipe 17 and the strong brine spray evaporator 16. The other path of concentrated brine is sprayed by a concentrated water spray pump 9 and a concentrated water sprayer 7, heated and evaporated by a draught fan 4, water is received by a water receiver 35 and discharged by a wind chimney 34.

The air-cooled heat exchanger 3 heats air by induced air of the induced draft fan 4, water is raised by the water raising device 1, salt is crystallized in the concentrated water evaporation pool 36, and the salt is discharged from the factory through the wind chimney 3 after passing through the water collecting device 35.

As shown in fig. 2: the wind chimney 34 is provided with a cold wind inlet sleeve 47, and a fan 48 and a fan bracket 46 are arranged in the wind chimney 34.

Otherwise identical to fig. 1.

As shown in fig. 3: the wind chimney 34 is provided with a hot and humid air cooler 50, the outlet of the water vapor condenser 26 is connected with the hot and humid air cooler 50 through a pipeline, and the outlet of the hot and humid air cooler 50 is connected with the cold circulating water coil 39 through a pipeline. A humid air condensate water collector 51 is arranged below the humid hot air cooler 50, and the humid air condensate water collector 51 is connected with the recovery condensate water tank 49 through a pipeline.

Otherwise identical to fig. 1.

As shown in fig. 4: the outlet of the concentrated water heater heat exchanger coil 14 enters into the concentrated water spray secondary heating coil 52 for secondary heating through a pipeline, the hot circulating water which releases heat through secondary heating enters into the air cooling heat exchanger 3 through a pipeline for further cooling, and the cooled hot circulating water enters into the circulating water tank 20.

Otherwise identical to fig. 1.

As shown in fig. 5: the outlet of the concentrated water heater heat exchanger coil 14 enters into the concentrated water spray secondary heating coil 52 for secondary heating through a pipeline, the hot circulating water which releases heat through secondary heating enters into the air cooling heat exchanger 3 through a pipeline for further cooling, and the cooled hot circulating water enters into the circulating water tank 20.

Otherwise identical to fig. 2.

As shown in fig. 6: the outlet of the concentrated water heater heat exchanger coil 14 enters into the concentrated water spray secondary heating coil 52 for secondary heating through a pipeline, the hot circulating water which releases heat through secondary heating enters into the air cooling heat exchanger 3 through a pipeline for further cooling, and the cooled hot circulating water enters into the circulating water tank 20.

Otherwise identical to fig. 3.

As shown in fig. 7: the heat source heater coil 43 heats and boils in the generator 44 to generate steam, the steam enters the low-efficiency generator heating coil 53 in the low-efficiency generator 54 to release heat and condense, the condensed refrigerant water enters the refrigerant water vapor condenser 21, and the refrigerant steam generated in the low-efficiency generator 54 enters the refrigerant water vapor condenser 21 to condense through a pipeline.

The solution pump 40 pumps the dilute lithium bromide solution into the lithium bromide solution heat exchanger 42 for heat exchange, the lithium bromide solution after heat exchange enters the lithium bromide solution high-efficiency heat exchanger 55, then the lithium bromide solution enters the generator 44, the heat source heater coil 43 in the generator 44 heats, boils and concentrates the lithium bromide solution, the heat is released by the lithium bromide solution high-efficiency heat exchanger 55, the lithium bromide solution enters the low-efficiency generator 54, and then enters the lithium bromide solution 42 through the pipeline, and then enters the absorber 23 for spraying to form a circulation.

Otherwise identical to fig. 1.

As shown in fig. 8: the heat source heater coil 43 heats and boils in the generator 44 to generate steam, the steam enters the low-efficiency generator heating coil 53 in the low-efficiency generator 54 to release heat and condense, the condensed refrigerant water enters the refrigerant water vapor condenser 21, and the refrigerant steam generated in the low-efficiency generator 54 enters the refrigerant water vapor condenser 21 to condense through a pipeline.

Otherwise identical to fig. 2.

As shown in fig. 9: the heat source heater coil 43 heats and boils in the generator 44 to generate steam, the steam enters the low-efficiency generator heating coil 53 in the low-efficiency generator 54 to release heat and condense, the condensed refrigerant water enters the refrigerant water vapor condenser 21, and the refrigerant steam generated in the low-efficiency generator 54 enters the refrigerant water vapor condenser 21 to condense through a pipeline.

Otherwise identical to fig. 3.

As shown in fig. 10: the heat source heater coil 43 heats and boils in the generator 44 to generate steam, the steam enters the low-efficiency generator heating coil 53 in the low-efficiency generator 54 to release heat and condense, the condensed refrigerant water enters the refrigerant water vapor condenser 21, and the refrigerant steam generated in the low-efficiency generator 54 enters the refrigerant water vapor condenser 21 to condense through a pipeline.

Otherwise identical to fig. 4.

As shown in fig. 11: the heat source heater coil 43 heats and boils in the generator 44 to generate steam, the steam enters the low-efficiency generator heating coil 53 in the low-efficiency generator 54 to release heat and condense, the condensed refrigerant water enters the refrigerant water vapor condenser 21, and the refrigerant steam generated in the low-efficiency generator 54 enters the refrigerant water vapor condenser 21 to condense through a pipeline.

Otherwise identical to fig. 5.

As shown in fig. 12: the heat source heater coil 43 heats and boils in the generator 44 to generate steam, the steam enters the low-efficiency generator heating coil 53 in the low-efficiency generator 54 to release heat and condense, the condensed refrigerant water enters the refrigerant water vapor condenser 21, and the refrigerant steam generated in the low-efficiency generator 54 enters the refrigerant water vapor condenser 21 to condense through a pipeline.

Otherwise identical to fig. 6.

Claims

1. The device comprises a single-effect lithium bromide unit, a brine negative pressure evaporation concentration condenser serving as a desalting device and a hot air evaporation brine crystallization brine-containing device, and is characterized in that: the concentrated lithium bromide solution in the absorber of the single-effect lithium bromide unit absorbs the water vapor evaporated by the evaporator and then heats up, and then cools down through circulating water;

the cooled dilute lithium bromide solution is pressurized by a solution pump, enters a generator through a heat exchanger, is heated and concentrated by a heat source, enters an absorber after being cooled by the heat exchanger, and completes solution circulation; the water vapor generated by boiling and concentrating the dilute lithium bromide solution of the generator enters a condenser to be cooled by circulating water to release heat and condense;

The refrigerant water formed by condensation enters an evaporator after being throttled and decompressed, and is evaporated, the heat in the cold water is absorbed to cool the cold water, and the cold water emits heat, so that the purpose of refrigeration is achieved; the refrigerant vapor formed by evaporation enters the absorber again to be absorbed by the concentrated solution to form a dilute solution, so as to complete the refrigerant circulation;

the heat circulating water heated by the absorber and the condenser of the single-effect lithium bromide unit is used as a heat source; at least two stages of heat circulating water heaters of the single-effect lithium bromide unit are used for heating the strong brine at one stage and heating air at the second stage, so that the heat circulating water of the single-effect lithium bromide unit is cooled and used as a heat source for evaporating, concentrating and crystallizing the strong brine; the cooled single-effect lithium bromide unit heat circulating water is heated by an absorber and a condenser device to form circulation; the refrigerant circulating water evaporated and cooled by the evaporator of the single-effect lithium bromide unit is used as a condensation cold source for spraying and evaporating a water vapor condensation water chamber;

the refrigerant circulating water with heat absorption and temperature rise enters a single-effect lithium bromide unit evaporation device to release heat and cool and then is input into a water vapor condensation chamber; at least one stage of cold circulating water heat exchanger of the single-effect lithium bromide unit is used for condensing negative pressure steam in the steam condensing chamber; the condensing circulating water heat exchanger of the single-effect lithium bromide unit absorbs the heat of water vapor, and provides the heat of coolant water evaporation for the single-effect lithium bromide unit, so that the single-effect lithium bromide unit has high-efficiency thermal circulation;

The negative pressure evaporation, concentration and desalination device for the salt-containing water connected with the single-effect lithium bromide unit comprises a strong salt water evaporation chamber and a water vapor condensation chamber which are isolated and communicated with each other through a partition plate and a water receiver, or two independent chambers which are communicated through a pipeline communicating vessel; the top of the strong brine evaporation chamber is provided with a hot strong brine spray evaporation device; the bottom of the strong brine evaporation chamber is provided with a strong brine collecting tank, the strong brine collecting tank is connected with a strong brine discharge pipe and a strong brine circulating water outlet pipe, and the strong brine discharge pipe and the strong brine circulating water outlet pipe are connected by a same pipe and are connected in a split way through a three-way pipe fitting; the concentrated brine circulating water outlet pipe is mixed with newly-fed concentrated brine, the mixture is pumped into a concentrated brine heater through a concentrated brine circulating pump to be heated, and the heated concentrated brine is connected with a concentrated brine spray evaporation device at the top of a concentrated brine evaporation chamber through a pipeline; inputting the concentrated brine into a spraying device in a concentrated brine evaporator, and spraying and evaporating the concentrated brine;

the upper parts of the two chambers are provided with separating sections which are used as isolating devices through water collectors, and the separating sections of the water collectors collect the recovered saline water into a saline water pond at the bottom of the saline water evaporation chamber; the condensing heat exchanger device of the single-effect lithium bromide unit is arranged in a condensed water chamber communicated with the negative pressure chamber, and condensed water is obtained by condensing vapor evaporated in the strong brine evaporation chamber;

A vacuum exhaust pipe is arranged in the water vapor condensing chamber, and the vacuum pumping device is used for vacuumizing the water vapor condensing chamber and the strong brine evaporating chamber, so that the evaporating temperature of the strong brine is reduced;

the strong brine is subjected to hard removal treatment, so that temporary hard and permanent hard in the strong brine are removed, calcium carbonate salt which is easy to scale, calcium sulfate salt and magnesium carbonate salt which are easy to scale are released in advance, and are converted into sodium sulfate salt, sodium nitrate salt and sodium chloride salt which are difficult to scale, so that the heat exchange surface is not scaled in the concentration process, and even if crystals are generated, the strong brine can be dissolved and removed by dilution;

a water collector separating the concentrated brine evaporating chamber and the water vapor condensing chamber, and converging the recovered brine into a concentrated brine pool at the bottom of the concentrated brine evaporating chamber; the refrigerant heat exchanger of the single-effect lithium bromide unit is arranged in a water vapor condensing chamber, water vapor generated by spraying and evaporating strong brine is collected by a water collector and then enters the water vapor condensing chamber provided with the refrigerant heat exchanger of the single-effect lithium bromide unit, the water vapor is condensed on the surface of an evaporator to generate condensed water flow, and the condensed water flow is collected in a water collecting tank at the bottom of the refrigerant heat exchanger of the single-effect lithium bromide unit and pumped out by a water pump;

The hot air evaporation strong brine crystallization salt-containing device of the high salt-containing wastewater concentration crystallization desalination water treatment device comprises an air heater, a induced fan, a strong brine sprayer, a strong brine water lifting device, a strong brine pond, a strong brine water receiving device, a wind chimney or an induced draft fan; the concentrated brine discharge pipe of the concentrated brine evaporation chamber is connected with a concentrated brine sprayer of a hot air evaporation concentrated brine crystallization salt-containing device through a water pump; the fan is led to lead the air to heat the air through the air heater, the hot air evaporates strong brine which is sprayed and raised by the water heater, and the strong brine is crystallized; the concentrated brine sprayed by the water spraying machine is evaporated to increase the concentration, and finally crystalline salt is generated, and the salt can be recycled;

the hot circulating water of the single-effect lithium bromide unit is led into a concentrated brine heater to heat the concentrated brine, the heat of the hot circulating water is released at a high temperature Duan Bufen, then the hot circulating water is led into an air heat exchanger to heat the air introduced by a fan, and the air heated by the air heat exchanger enters a concentrated brine evaporation pond formed by a spraying device and a water lifting device which are connected through the concentrated brine pump to evaporate the concentrated brine, so that the concentrated brine is evaporated and crystallized; the hot and humid air with brine is discharged into the atmosphere through a wind chimney or a draught fan after the hot and humid air is intercepted by the strong brine collector; the hot and humid air containing evaporated water vapor is subjected to convection diffusion evaporation by utilizing the difference of specific gravity of the hot and cold air through a fan or a wind chimney device;

2. The device comprises a single-effect lithium bromide unit, a brine negative pressure evaporation concentration condenser serving as a desalting device and a hot air evaporation brine crystallization brine-containing device, and is characterized in that: the concentrated lithium bromide solution in the absorber of the single-effect lithium bromide unit absorbs the water vapor evaporated by the evaporator and then heats up, and then cools down through circulating water;

The heat circulating water heated by the absorber and the condenser of the single-effect lithium bromide unit is used as a heat source; the heat circulation water heater of the single-effect lithium bromide unit is three-stage, the first stage heats the strong brine, the second stage heats the sprayed strong brine secondarily, the third stage heats the air, and the heat circulation water of the single-effect lithium bromide unit is cooled and used as a heat source for evaporating, concentrating and crystallizing the strong brine; the cooled single-effect lithium bromide unit heat circulating water is heated by an absorber and a condenser device to form circulation; the refrigerant circulating water evaporated and cooled by the evaporator of the single-effect lithium bromide unit is used as a condensation cold source for spraying and evaporating a water vapor condensation water chamber;

the negative pressure evaporation, concentration and desalination device for the salt-containing water connected with the single-effect lithium bromide unit comprises a strong salt water evaporation chamber and a water vapor condensation chamber which are isolated and communicated with each other through a partition plate and a water receiver, or two independent chambers which are communicated through a pipeline communicating vessel; the top of the strong brine evaporation chamber is provided with a hot strong brine spray evaporation device; meanwhile, a strong brine spray heater is arranged in the strong brine evaporation chamber and is used as a strong brine secondary heating evaporation device;

The bottom of the strong brine evaporation chamber is provided with a strong brine collecting tank, the strong brine collecting tank is connected with a strong brine discharge pipe and a strong brine circulating water outlet pipe, and the strong brine discharge pipe and the strong brine circulating water outlet pipe are connected by a same pipe and are connected in a split way through a three-way pipe fitting; the concentrated brine circulating water outlet pipe is mixed with newly-fed concentrated brine, the mixture is pumped into a concentrated brine heater through a concentrated brine circulating pump to be heated, and the heated concentrated brine is connected with a concentrated brine spray evaporation device at the top of a concentrated brine evaporation chamber through a pipeline; inputting the concentrated brine into a spraying device in a concentrated brine evaporator, and spraying and evaporating the concentrated brine;

3. The device for concentrating, crystallizing and desalinating water by using high-salt-content wastewater through the lithium bromide unit comprises a double-effect lithium bromide unit and a salt-containing water negative pressure evaporation concentration condenser which are used as desalination devices and a hot air evaporation strong salt-containing water crystallization salt-containing device, and is characterized in that: the concentrated lithium bromide solution in the absorber of the double-effect lithium bromide unit absorbs the water vapor evaporated by the evaporator and then heats up, and then cools down through circulating water; the dilute solution in the absorber is pressurized by a solution pump, enters a high-pressure generator through a low-temperature heat exchanger and a high-temperature heat exchanger, is heated and concentrated by a heat source, and the concentrated intermediate solution enters the low-pressure generator after entering the high-temperature heat exchanger, is heated and concentrated by refrigerant steam from the high-pressure generator, and the concentrated solution enters the absorber after entering the low-temperature heat exchanger to complete solution circulation;

The water vapor generated by boiling and concentrating the dilute lithium bromide solution of the low-pressure generator enters a condenser and is cooled by circulating water to release heat for condensation;

the solution in the high-pressure generator is heated, the generated first-effect refrigerant steam enters the low-pressure generator and is used as a heat source to heat the solution in the low-pressure generator, the generated second-effect refrigerant steam enters the condenser, the first-effect refrigerant steam forms a mixture of the refrigerant steam and the refrigerant water in the low-pressure generator, the mixture flows into the condenser after being throttled and decompressed, and the first-effect refrigerant steam and the second-effect refrigerant steam are condensed together by cooling water; the refrigerant water formed by condensation enters an evaporator after being throttled and decompressed, and is evaporated, the heat in the cold water is absorbed to cool the cold water, and the cold water emits heat, so that the purpose of refrigeration is achieved; the refrigerant vapor formed by evaporation enters the absorber again to be absorbed by the concentrated solution to form a dilute solution, so as to complete the refrigerant circulation;

the hot circulating water heated by the absorber and the condenser of the double-effect lithium bromide unit is used as a heat source; the heat circulation water heater of the double-effect lithium bromide unit is at least two stages, wherein one stage is used for heating the strong brine, and the other stage is used for heating air, so that the heat circulation water of the double-effect lithium bromide unit is cooled and used as a heat source for evaporating, concentrating and crystallizing the strong brine; the cooled double-effect lithium bromide unit heat circulating water is heated by an absorber and a condenser device to form circulation; the refrigerant circulating water evaporated and cooled by the evaporator of the double-effect lithium bromide unit is used as a condensation cold source for spraying and evaporating a water vapor condensation water chamber;

The refrigerant circulating water with heat absorption and temperature rise enters the double-effect lithium bromide unit evaporation device to release heat and cool, and then is input into the water vapor condensation chamber; at least one stage of cold circulating water heat exchanger of the double-effect lithium bromide unit condenses the negative pressure steam in the steam condensing chamber; the condensing circulating water heat exchanger of the double-effect lithium bromide unit absorbs the heat of water vapor, and provides the heat quantity of coolant water evaporation for the double-effect lithium bromide unit, so that the double-effect lithium bromide unit has high-efficiency thermal circulation;

the negative pressure evaporation, concentration, condensation and desalination device for the salt-containing water connected with the double-effect lithium bromide unit comprises a strong salt water evaporation chamber and a water vapor condensation chamber which are isolated and communicated with each other through a partition plate and a water receiver, or two independent chambers which are communicated through a pipeline communicating vessel; the top of the strong brine evaporation chamber is provided with a hot strong brine spray evaporation device; the bottom of the strong brine evaporation chamber is provided with a strong brine collecting tank, the strong brine collecting tank is connected with a strong brine discharge pipe and a strong brine circulating water outlet pipe, and the strong brine discharge pipe and the strong brine circulating water outlet pipe are connected by a same pipe and are connected in a split way through a three-way pipe fitting; the concentrated brine circulating water outlet pipe is mixed with newly-fed concentrated brine, the mixture is pumped into a concentrated brine heater through a concentrated brine circulating pump to be heated, and the heated concentrated brine is connected with a concentrated brine spray evaporation device at the top of a concentrated brine evaporation chamber through a pipeline; inputting the concentrated brine into a spraying device in a concentrated brine evaporator, and spraying and evaporating the concentrated brine;

The upper parts of the two chambers are provided with separating sections which are used as isolating devices through water collectors, and the separating sections of the water collectors collect the recovered saline water into a saline water pond at the bottom of the saline water evaporation chamber; the double-effect lithium bromide unit condensation heat exchanger device is arranged in a condensed water chamber communicated with the negative pressure chamber, and condensed water is obtained by condensing vapor evaporated by the strong brine evaporation chamber;

a water collector separating the concentrated brine evaporating chamber and the water vapor condensing chamber, and converging the recovered brine into a concentrated brine pool at the bottom of the concentrated brine evaporating chamber; the refrigerant heat exchanger of the double-effect lithium bromide unit is arranged in a water vapor condensing chamber, water vapor generated by spraying and evaporating strong brine is collected by a water collector and then enters the water vapor condensing chamber provided with the refrigerant heat exchanger of the double-effect lithium bromide unit, the water vapor is condensed on the surface of an evaporator to generate condensed water flow, and the condensed water flow is collected in a water collecting tank at the bottom of the refrigerant heat exchanger of the double-effect lithium bromide unit and pumped out by a water pump;

the hot circulating water of the double-effect lithium bromide unit is led into a concentrated brine heater to heat the concentrated brine, the hot circulating water is heated to release heat at a high temperature Duan Bufen, then the hot circulating water is led into an air heat exchanger to heat the induced air of a fan, and the air heated by the air heat exchanger enters a concentrated brine evaporation pond formed by a spraying device and a water lifting device which are connected through the concentrated brine pump to evaporate the concentrated brine, so that the concentrated brine is evaporated and crystallized; the hot and humid air with brine is discharged into the atmosphere through a wind chimney or a draught fan after the hot and humid air is intercepted by the strong brine collector; the hot and humid air containing evaporated water vapor is subjected to convection diffusion evaporation by utilizing the difference of specific gravity of the hot and cold air through a fan or a wind chimney device;

4. The device for concentrating, crystallizing and desalinating water by using high-salt-content wastewater through the lithium bromide unit comprises a double-effect lithium bromide unit and a salt-containing water negative pressure evaporation concentration condenser which are used as desalination devices and a hot air evaporation strong salt-containing water crystallization salt-containing device, and is characterized in that: the concentrated lithium bromide solution in the absorber of the double-effect lithium bromide unit absorbs the water vapor evaporated by the evaporator and then heats up, and then cools down through circulating water; the dilute solution in the absorber is pressurized by a solution pump, enters a high-pressure generator through a low-temperature heat exchanger and a high-temperature heat exchanger, is heated and concentrated by a heat source, and the concentrated intermediate solution enters the low-pressure generator after entering the high-temperature heat exchanger, is heated and concentrated by refrigerant steam from the high-pressure generator, and the concentrated solution enters the absorber after entering the low-temperature heat exchanger to complete solution circulation;

the hot circulating water heated by the absorber and the condenser of the double-effect lithium bromide unit is used as a heat source; the hot circulating water heater of the double-effect lithium bromide unit is three-stage, the first stage heats the strong brine, the second stage heats the sprayed strong brine secondarily, the third stage heats the air, so that the hot circulating water of the double-effect lithium bromide unit is cooled, and the hot circulating water is used as a heat source for evaporating, concentrating and crystallizing the strong brine; the cooled double-effect lithium bromide unit heat circulating water is heated by an absorber and a condenser device to form circulation; the refrigerant circulating water evaporated and cooled by the evaporator of the double-effect lithium bromide unit is used as a condensation cold source for spraying and evaporating a water vapor condensation water chamber;

the negative pressure evaporation, concentration, condensation and desalination device for the salt-containing water connected with the double-effect lithium bromide unit comprises a strong salt water evaporation chamber and a water vapor condensation chamber which are isolated and communicated with each other through a partition plate and a water receiver, or two independent chambers which are communicated through a pipeline communicating vessel; the top of the strong brine evaporation chamber is provided with a hot strong brine spray evaporation device; meanwhile, a strong brine spray heater is arranged in the strong brine evaporation chamber and is used as a strong brine secondary heating evaporation device;

5. The water treatment device for concentrating, crystallizing and desalinating high-salt-content wastewater by a lithium bromide unit according to claim 1, 2, 3 or 4, wherein: the strong brine receiver comprises a folded plate type passive fan type.

6. The water treatment device for concentrating, crystallizing and desalinating high-salt-content wastewater by a lithium bromide unit according to claim 1, 2, 3 or 4, wherein: and a cold air device is introduced into the wind chimney or is arranged in the wind chimney to condense water vapor in the wet air and recycle condensed water.

7. The water treatment device for concentrating, crystallizing and desalinating high-salt-content wastewater by a lithium bromide unit according to claim 1, 2, 3 or 4, wherein: and condensing water vapor in the hot and humid air and recovering condensed water in the wind chimney or by arranging an air secondary evaporator of the lithium bromide unit.

8. The water treatment device for concentrating, crystallizing and desalinating high-salt-content wastewater by a lithium bromide unit according to claim 1, 2, 3 or 4, wherein: the strong brine is the strong brine which is subjected to chemical hard removal treatment and mainly contains sodium salt, and the main softening medicine of the strong brine is sodium carbonate; or the strong brine is the strong brine which is subjected to physical heating and hardness removal treatment and mainly contains sodium salt, and the physical hardness removal of the strong brine is to heat the strong brine mixed with the grit abrasive to 125 ℃ for hardness removal through a heat exchanger and a final-stage heater.

9. The water treatment device for concentrating, crystallizing and desalinating high-salt-content wastewater by a lithium bromide unit according to claim 1, 2, 3 or 4, wherein: the evaporation device of the lithium bromide unit is a secondary evaporation device of the primary lithium bromide unit, the steam evaporated by negative pressure is condensed, the evaporation device of the secondary lithium bromide unit is the wet and hot air discharged by the induced draft fan for partial condensation, and condensed water is recovered.

10. The water treatment device for concentrating, crystallizing and desalinating high-salt-content wastewater by a lithium bromide unit according to claim 1, 2, 3 or 4, wherein: the vacuumizing device comprises a vacuum pump, a water ring vacuum pump, a mechanical vacuum pump and a steam jet vacuum pump, wherein the vacuum pump consists of a condensate water suction pump and a jet water air extractor.