CN114956260B - High-salt wastewater treatment process and treatment device thereof - Google Patents
High-salt wastewater treatment process and treatment device thereof Download PDFInfo
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- CN114956260B CN114956260B CN202210506767.6A CN202210506767A CN114956260B CN 114956260 B CN114956260 B CN 114956260B CN 202210506767 A CN202210506767 A CN 202210506767A CN 114956260 B CN114956260 B CN 114956260B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2433—Discharge mechanisms for floating particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/245—Discharge mechanisms for the sediments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/02—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping in boilers or stills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B5/00—Other centrifuges
- B04B5/10—Centrifuges combined with other apparatus, e.g. electrostatic separators; Sets or systems of several centrifuges
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C1/00—Working-up tar
- C10C1/04—Working-up tar by distillation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- Life Sciences & Earth Sciences (AREA)
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- Environmental & Geological Engineering (AREA)
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to a high-salt wastewater treatment process and a treatment device thereof, wherein the treatment process comprises the following steps of S1: separating high-salt wastewater; s2: treating the lower layer solid-liquid matter; s3: treating upper tar; comprises a distillation kettle, a condensing tower, a high-pressure steam pipeline, a high-salt wastewater tank, a circulating cooling pipeline, an exhaust gas recovery pipeline, a low-boiling-point solvent output pipeline and a high-boiling-point solvent output pipeline; the high-salt wastewater is precipitated and separated in a high-salt wastewater tank, and tar separated from the top layer enters a tar precipitation tank and is conveyed to a high-salt wastewater circulating pipeline through a second conveying pump and enters a distillation kettle; distilling by a distilling kettle, and liquefying and outputting solvents with different boiling points at different cooling positions of a condensing tower; can realize the high-efficiency separation of organic matters floating in the high-salt wastewater; a salt sedimentation tank in the high-salt wastewater tank conveys wet materials to a centrifugal machine from the bottom end for solid-liquid separation; the separation of inorganic salt, solid matters and organic matters is realized; the pollution to the environment is reduced.
Description
Technical Field
The invention relates to the technical field of high-salt wastewater treatment, in particular to a high-salt wastewater treatment process and a treatment device thereof.
Background
With the rapid development of economy, the amount of hazardous waste (hazardous waste for short) produced increases dramatically. In view of their potential environmental risks and threats to human health, hazardous waste has become one of the major environmental problems currently facing. The incineration can effectively destroy toxic and harmful organic wastes in the hazardous wastes, reduce the volume and the quality of the hazardous wastes, is favorable for the final safe disposal of the hazardous wastes, and is the fastest and most effective technology for realizing the reduction, harmless and recycling treatment of the hazardous wastes.
In recent years, the hazardous waste incineration industry rapidly develops, high-sulfur Gao Lusu hazardous waste incineration is also gradually promoted, the hazardous waste incineration industry is highly competitive, and the hazardous waste disposal price is continuously lowered. In order to reduce the running cost, each hazardous waste incineration industry continuously explores new technologies so as to adapt to the form of intense competition of the hazardous waste incineration industry. For high-sulfur Gao Lusu hazardous waste incineration, a large amount of acidic substances are generated in the incineration process due to the high halogen content characteristic, so that a large amount of high-salt wastewater is generated in the wet deacidification process. For the part of high-salt wastewater, if the high-salt wastewater is discharged to the outside of the device for treatment, the running cost of high-sulfur Gao Lusu hazardous waste incineration is increased seriously, and the high-sulfur Gao Lusu hazardous waste incineration enterprises are extremely unfavorable in the form of strong competition in the current hazardous waste incineration industry.
Disclosure of Invention
The invention aims to solve the technical problems of incomplete separation of solid, liquid and organic matters and difficult recovery of common high-salt wastewater.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a high salt effluent treatment plant which innovation point lies in: comprises a distillation kettle, a condensing tower, a high-pressure steam pipeline, a high-salt wastewater tank, a circulating cooling pipeline, an exhaust gas recovery pipeline, a low-boiling-point solvent output pipeline and a high-boiling-point solvent output pipeline;
the outer wall of the distillation kettle is provided with a steam jacket, and the steam jacket is connected with a high-pressure steam pipeline; the stirring motor is arranged on the distillation still, and the output end of the stirring motor is connected with the stirring blade to realize stirring of the high-salt wastewater in the distillation still; a heating coil is also arranged in the distillation kettle and connected with a high-pressure steam pipeline; the bottom end of the distillation kettle is connected with a condensed water discharge pipe and a high-salt wastewater discharge port; the top end of the distillation kettle is provided with a high-salt wastewater feed inlet; a high-salt wastewater circulating pipeline is connected between a high-salt wastewater outlet and a high-salt wastewater inlet on the distillation kettle, and a first conveying pump is arranged on the high-salt wastewater circulating pipeline;
the condensing tower is connected to the top end of the distillation kettle, and a first-stage condenser, a second-stage condenser and a third-stage condenser are sequentially arranged in the condensing tower from bottom to top; the side wall of the condensing tower is connected with a circulating cooling pipeline, and cooling water is arranged in the circulating cooling pipeline to cool substances in the condensing tower; the top end of the condensing tower is connected with an exhaust gas recovery pipeline, and the exhaust gas recovery pipeline is also connected with an exhaust gas absorption module;
the high-salt wastewater tank is provided with a second conveying pump, and the output end of the second conveying pump is connected to the high-salt wastewater circulating pipeline through a pipeline;
one end of the low-boiling-point solvent output pipeline is connected to the condensing tower and is positioned between the second-stage condenser and the third-stage condenser of the condensing tower, so that the condensation output of the low-boiling-point solvent is realized; one end of the high-boiling-point solvent output pipeline is connected to the condensing tower and is positioned at the first-stage condenser of the condensing tower to realize the condensation output of the high-boiling-point solvent;
the high-salt wastewater tank comprises a salt sedimentation tank and a tar sedimentation tank; the bottom end of the salt sedimentation tank is connected with a centrifugal machine through a pipeline, and solid wet materials in the salt sedimentation tank are subjected to solid-liquid separation through the centrifugal machine; the tar sedimentation tank is connected to the salt sedimentation tank, tar on the upper layer in the salt sedimentation tank flows into the tar sedimentation tank, and the tar is conveyed to the high-salt wastewater circulation pipeline through the second conveying pump.
A technology for treating high-salt wastewater by adopting a high-salt wastewater treatment device is characterized in that: the specific treatment process is as follows:
s1: separation of high-salt wastewater: placing the high-salt wastewater into a salt precipitation tank, stirring and standing by a driving motor, and outputting solid-liquid matters at the lower layer through an output port at the bottom end of the salt precipitation tank when layering is formed on the high-salt wastewater; conveying the tar on the upper layer into a tar sedimentation tank connected with the edge sedimentation tank;
s2: and (3) treating the lower solid-liquid substance: placing the solid-liquid matters at the lower layer in a centrifugal machine for solid-liquid separation, enabling the separated liquid to enter a condensed water discharge pipeline, and enabling the separated solid to enter a drying device for drying to realize solid-liquid separation;
s3: treatment of upper tar: pumping the upper layer tar into a distillation kettle, stirring the tar in the distillation kettle by a stirring motor, and heating the tar in the distillation kettle by high-pressure steam; controlling the vacuum degree in the distillation kettle to be more than-0.06 Mpa; the temperature in the distillation kettle is 80-85 ℃; when the temperature in the distillation still reaches 80 ℃ through self-heating, and after the temperature from the bottom of the condensing tower connected with the distillation still to the top of the condensing tower changes for 30min, opening a low-boiling-point solvent output pipeline valve and a high-boiling-point solvent output pipeline valve connected with the condensing tower; and the low boiling point solvent and the high boiling point solvent were collected at a flow rate of 100L/h.
Further, the pressure in a steam jacket on the distillation kettle is less than 0.2Mpa; the liquid level in the distillation still is not more than 2/3 of the liquid level in the distillation still.
Further, the automatic control temperature of cooling water used on a condensing tower connected with the distillation still is 68 ℃, and when the cooling water temperature at the bottom of the condensing tower exceeds 68 ℃, the cooling water circulation is started.
Further, a distilled water output pipeline without solvent is arranged at the secondary condenser.
Further, the waste gas absorption module comprises a vacuum buffer tank and an absorption tower; the top end of the vacuum buffer tank is connected to the absorption tower through a pipeline, and a vacuum pump is arranged on the pipeline.
Further, the bottom of the vacuum buffer tank is connected to a waste water buffer tank through a pipeline, and a waste water circulating pump is arranged on the waste water buffer tank, so that waste water in the waste water buffer tank is conveyed into a high-salt waste water tank through the waste water circulating pump.
Furthermore, a high boiling point solvent buffer tank is arranged between the high boiling point solvent output pipeline and the condensing tower.
Furthermore, an external high-salt wastewater adding pipeline is arranged on the condensing tower and positioned at the position of the secondary condenser.
The invention has the advantages that:
1) In the invention, high-salt wastewater is precipitated and separated in a high-salt wastewater tank, and tar separated from the top layer enters a tar precipitation tank and is conveyed to a high-salt wastewater circulating pipeline through a second conveying pump and enters a distillation kettle; distilling by a distilling kettle, and liquefying and outputting solvents with different boiling points at different cooling positions of a condensing tower; can realize the high-efficiency separation of organic matters floating in the high-salt wastewater; a salt sedimentation tank in the high-salt wastewater tank conveys wet materials to a centrifugal machine from the bottom end for solid-liquid separation; fully realizes the full separation of inorganic salt, solid matters and organic matters; reduces the pollution to the environment and improves the recycling of resources.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a process flow diagram of a high salt wastewater treatment process of the present invention.
FIG. 2 is a system configuration diagram of a high salt wastewater treatment apparatus of the present invention.
Description of the embodiments
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The high-salt wastewater treatment process shown in fig. 1 comprises the following specific treatment processes:
s1: separation of high-salt wastewater: placing the high-salt wastewater into a salt precipitation tank, stirring and standing by a driving motor, and outputting solid-liquid matters at the lower layer through an output port at the bottom end of the salt precipitation tank when layering is formed on the high-salt wastewater; conveying the tar on the upper layer into a tar sedimentation tank connected with the edge sedimentation tank;
s2: and (3) treating the lower solid-liquid substance: placing the solid-liquid matters at the lower layer in a centrifugal machine for solid-liquid separation, enabling the separated liquid to enter a condensed water discharge pipeline, and enabling the separated solid to enter a drying device for drying to realize solid-liquid separation;
s3: treatment of upper tar: pumping the upper layer tar into a distillation kettle, stirring the tar in the distillation kettle by a stirring motor, and heating the tar in the distillation kettle by high-pressure steam; controlling the vacuum degree in the distillation kettle to be more than-0.06 Mpa; the temperature in the distillation kettle is 80-85 ℃; when the temperature in the distillation still reaches 80 ℃ through self-heating, and after the temperature from the bottom of the condensing tower connected with the distillation still to the top of the condensing tower changes for 30min, opening a low-boiling-point solvent output pipeline valve and a high-boiling-point solvent output pipeline valve connected with the condensing tower; and the low boiling point solvent and the high boiling point solvent were collected at a flow rate of 100L/h.
The pressure in a steam jacket on the distillation kettle is less than 0.2Mpa; the liquid level in the still pot is not more than 2/3 of the liquid level in the still pot.
The automatic control temperature of cooling water used on a condensing tower connected with the distillation still is 68 ℃, and when the cooling water temperature at the bottom of the condensing tower exceeds 68 ℃, the cooling water circulation is started.
The high-salt wastewater treatment device shown in fig. 2 comprises a distillation kettle 1, a condensation tower 2, a high-pressure steam pipeline 3, a high-salt wastewater tank 4, a circulating cooling pipeline 5, an exhaust gas recovery pipeline 6, a low-boiling-point solvent output pipeline 7 and a high-boiling-point solvent output pipeline 8.
The outer wall of the distillation kettle 1 is provided with a steam jacket, and the steam jacket is connected with a high-pressure steam pipeline 3; a stirring motor is arranged on the distillation still 1, and the output end of the stirring motor is connected with a stirring blade to realize stirring of the high-salt wastewater in the distillation still 1; a heating coil is also arranged in the distillation kettle 1 and is connected with a high-pressure steam pipeline 3; the bottom end of the distillation still 1 is connected with a condensed water discharge pipe 11 and a high-salt wastewater discharge port; the top end of the distillation kettle 1 is provided with a high-salt wastewater feed inlet; a high-salt wastewater circulating pipeline 9 is connected between a high-salt wastewater outlet and a high-salt wastewater inlet on the distillation still 1, and a first conveying pump is arranged on the high-salt wastewater circulating pipeline 9.
The condensing tower 2 is connected to the top end of the distillation kettle 1, and a first-stage condenser 21, a second-stage condenser 22 and a third-stage condenser 23 are sequentially arranged in the condensing tower 2 from bottom to top; the side wall of the condensing tower 2 is connected with a circulating cooling pipeline 5, and cooling water is arranged in the circulating cooling pipeline 5 to cool substances in the condensing tower 2; the top of the condensing tower 2 is connected with an exhaust gas recovery pipeline 6, and the exhaust gas recovery pipeline 6 is also connected with an exhaust gas absorption module 61.
The high-salt wastewater tank 4 is provided with a second delivery pump, and the output end of the second delivery pump is connected to the high-salt wastewater circulating pipeline 9 through a pipeline.
One end of the low boiling point solvent output pipeline 7 is connected to the condensing tower 2 and is positioned between the secondary condenser 22 and the tertiary condenser 23 of the condensing tower 2 to realize the condensation output of the low boiling point solvent; one end of the high boiling point solvent output pipeline 8 is connected to the condensing tower 2 and is positioned at the first-stage condenser 21 of the condensing tower 2, so that the condensation output of the high boiling point solvent is realized.
A distilled water outlet pipe 221 without solvent is provided at the secondary condenser 22.
The exhaust gas absorption module 61 includes a vacuum buffer tank 611 and an absorption tower 612; the top end of the vacuum buffer tank 611 is connected to the absorption tower 612 through a pipe, and a vacuum pump is provided on the pipe.
The bottom end of the vacuum buffer tank 611 is connected to a wastewater buffer tank 62 through a pipeline, and a wastewater circulation pump is arranged on the wastewater buffer tank 62, and wastewater in the wastewater buffer tank 62 is conveyed into the high-salt wastewater tank 4 through the wastewater circulation pump.
The high-salt wastewater tank 4 comprises a salt sedimentation tank 41 and a tar sedimentation tank 42; the bottom end of the salt precipitation tank 41 is connected with a centrifugal machine 43 through a pipeline, and solid wet materials in the salt precipitation tank 41 are subjected to solid-liquid separation through the centrifugal machine 43; the tar sedimentation tank 42 is connected to the salt sedimentation tank 41, and the tar on the upper layer in the salt sedimentation tank 41 flows into the tar sedimentation tank and is conveyed to the high-salt wastewater circulation pipeline 9 by the second conveying pump.
A high boiling point solvent buffer tank 81 is arranged between the high boiling point solvent output pipeline 8 and the condensing tower 2.
An external high-salt wastewater adding pipeline 24 is arranged on the condensing tower 2 at the position of the secondary condenser.
The working principle of the invention is as follows: the high-salt wastewater is precipitated and separated in a high-salt wastewater tank, and tar separated from the top layer enters a tar precipitation tank and is conveyed to a high-salt wastewater circulating pipeline through a second conveying pump and enters a distillation kettle; distilling by a distilling kettle, and liquefying and outputting solvents with different boiling points at different cooling positions of a condensing tower; can realize the high-efficiency separation of organic matters floating in the high-salt wastewater; a salt sedimentation tank in the high-salt wastewater tank conveys wet materials to a centrifugal machine from the bottom end for solid-liquid separation; fully realizes the full separation of inorganic salt, solid matters and organic matters; reduces the pollution to the environment and improves the recycling of resources.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A high-salt wastewater treatment device is characterized in that: comprises a distillation kettle, a condensing tower, a high-pressure steam pipeline, a high-salt wastewater tank, a circulating cooling pipeline, an exhaust gas recovery pipeline, a low-boiling-point solvent output pipeline and a high-boiling-point solvent output pipeline;
the outer wall of the distillation kettle is provided with a steam jacket, and the steam jacket is connected with a high-pressure steam pipeline; the stirring motor is arranged on the distillation still, and the output end of the stirring motor is connected with the stirring blade to realize stirring of the high-salt wastewater in the distillation still; a heating coil is also arranged in the distillation kettle and connected with a high-pressure steam pipeline; the bottom end of the distillation kettle is connected with a condensed water discharge pipe and a high-salt wastewater discharge port; the top end of the distillation kettle is provided with a high-salt wastewater feed inlet; a high-salt wastewater circulating pipeline is connected between a high-salt wastewater outlet and a high-salt wastewater inlet on the distillation kettle, and a first conveying pump is arranged on the high-salt wastewater circulating pipeline;
the condensing tower is connected to the top end of the distillation kettle, and a first-stage condenser, a second-stage condenser and a third-stage condenser are sequentially arranged in the condensing tower from bottom to top; the side wall of the condensing tower is connected with a circulating cooling pipeline, and cooling water is arranged in the circulating cooling pipeline to cool substances in the condensing tower; the top end of the condensing tower is connected with an exhaust gas recovery pipeline, and the exhaust gas recovery pipeline is also connected with an exhaust gas absorption module;
the high-salt wastewater tank is provided with a second conveying pump, and the output end of the second conveying pump is connected to the high-salt wastewater circulating pipeline through a pipeline;
one end of the low-boiling-point solvent output pipeline is connected to the condensing tower and is positioned between the second-stage condenser and the third-stage condenser of the condensing tower, so that the condensation output of the low-boiling-point solvent is realized; one end of the high-boiling-point solvent output pipeline is connected to the condensing tower and is positioned at the first-stage condenser of the condensing tower to realize the condensation output of the high-boiling-point solvent;
the high-salt wastewater tank comprises a salt sedimentation tank and a tar sedimentation tank; the bottom end of the salt sedimentation tank is connected with a centrifugal machine through a pipeline, and solid wet materials in the salt sedimentation tank are subjected to solid-liquid separation through the centrifugal machine; the tar sedimentation tank is connected to the salt sedimentation tank, tar on the upper layer in the salt sedimentation tank flows into the tar sedimentation tank, and the tar is conveyed to the high-salt wastewater circulation pipeline through the second conveying pump.
2. The high-salinity wastewater treatment device according to claim 1, wherein: and a distilled water output pipeline without solvent is arranged at the secondary condenser.
3. The high-salinity wastewater treatment device according to claim 1, wherein: the waste gas absorption module comprises a vacuum buffer tank and an absorption tower; the top end of the vacuum buffer tank is connected to the absorption tower through a pipeline, and a vacuum pump is arranged on the pipeline.
4. A high salt wastewater treatment apparatus according to claim 3, wherein: the bottom of the vacuum buffer tank is connected to a waste water buffer tank through a pipeline, and the waste water buffer tank is provided with a waste water circulating pump, and waste water in the waste water buffer tank is conveyed into a high-salt waste water tank through the waste water circulating pump.
5. The high-salinity wastewater treatment device according to claim 1, wherein: and a high boiling point solvent buffer tank is arranged between the high boiling point solvent output pipeline and the condensing tower.
6. The high-salinity wastewater treatment device according to claim 1, wherein: and an external high-salt wastewater adding pipeline is arranged on the condensing tower and positioned at the position of the secondary condenser.
7. A process for treating high-salt wastewater by using the high-salt wastewater treatment device as claimed in claim 1, which is characterized in that: the specific treatment process is as follows:
s1: separation of high-salt wastewater: placing the high-salt wastewater into a salt precipitation tank, stirring and standing by a driving motor, and outputting solid-liquid matters at the lower layer through an output port at the bottom end of the salt precipitation tank when layering is formed on the high-salt wastewater; conveying the tar on the upper layer into a tar sedimentation tank connected with the edge sedimentation tank;
s2: and (3) treating the lower solid-liquid substance: placing the solid-liquid matters at the lower layer in a centrifugal machine for solid-liquid separation, enabling the separated liquid to enter a condensed water discharge pipeline, and enabling the separated solid to enter a drying device for drying to realize solid-liquid separation;
s3: treatment of upper tar: pumping the upper layer tar into a distillation kettle, stirring the tar in the distillation kettle by a stirring motor, and heating the tar in the distillation kettle by high-pressure steam; controlling the vacuum degree in the distillation kettle to be more than-0.06 Mpa; the temperature in the distillation kettle is 80-85 ℃; when the temperature in the distillation still reaches 80 ℃ through self-heating, and after the temperature from the bottom of the condensing tower connected with the distillation still to the top of the condensing tower changes for 30min, opening a low-boiling-point solvent output pipeline valve and a high-boiling-point solvent output pipeline valve connected with the condensing tower; and the low boiling point solvent and the high boiling point solvent were collected at a flow rate of 100L/h.
8. The high-salinity wastewater treatment process according to claim 7, wherein: the pressure in a steam jacket on the distillation kettle is less than 0.2Mpa; the liquid level in the still pot is not more than 2/3 of the liquid level in the still pot.
9. The high-salinity wastewater treatment process according to claim 7, wherein: the automatic control temperature of cooling water used on a condensing tower connected with the distillation still is 68 ℃, and when the cooling water temperature at the bottom of the condensing tower exceeds 68 ℃, the cooling water circulation is started.
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