CN113023993A - Chemical wastewater zero-discharge treatment system - Google Patents
Chemical wastewater zero-discharge treatment system Download PDFInfo
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- CN113023993A CN113023993A CN202110288541.9A CN202110288541A CN113023993A CN 113023993 A CN113023993 A CN 113023993A CN 202110288541 A CN202110288541 A CN 202110288541A CN 113023993 A CN113023993 A CN 113023993A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/08—Thin film evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention relates to a treatment system for zero discharge of chemical wastewater, which is characterized by comprising a falling-film evaporator, a wastewater treatment unit, an exhaust gas treatment unit and a salinity treatment unit, wherein the wastewater treatment unit, the exhaust gas treatment unit and the salinity treatment unit are connected with the falling-film evaporator; the waste water treatment unit is connected with a steam outlet of the falling film evaporator and is used for treating waste water discharged by the falling film evaporator; the vacuumizing port of the falling film evaporator is connected with an exhaust gas treatment unit; a discharge port of the falling-film evaporator is connected with a salinity treatment unit, and a desalting kettle of the salinity treatment unit is used for crystallizing and recovering solid salinity discharged by the falling-film evaporator; a first heat exchanger is arranged in a first water separator of the wastewater treatment unit and used for preheating heat conducting oil by steam discharged by the falling film evaporator, and the preheated heat conducting oil is used for heating the falling film evaporator and the desalting kettle; and one part of the effluent treated by the wastewater treatment unit is recycled for the desalting kettle, and the other part of the effluent is recycled for the activation and regeneration of the activated carbon and the ion exchange resin of the wastewater treatment unit.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a chemical wastewater zero-discharge treatment system.
Background
Chemical industry is an important basic industry in China, and relates to important industries of the national civilians, including coal chemical industry, refining chemical industry, natural gas chemical industry, petrochemical industry, organic/inorganic chemical industry, fine chemical industry and the like. In the coal chemical industry, the discharged wastewater has large water volume, high turbidity, high chroma and high salinity, and organic matters which are difficult to degrade exist in the wastewater, so that the CODcr in the wastewater is high. The waste water treatment has the problems of environmental protection and reutilization all the time, and new wastes are often generated in the waste water treatment process to form new pollution, and meanwhile, a corresponding specialized, modularized and generalized treatment device is also lacked, so that the convenient and efficient treatment of chemical waste water, especially coal chemical waste water is realized. Therefore, a practical chemical wastewater zero-discharge treatment system is developed, environment-friendly zero-discharge treatment is carried out on a large amount of coal chemical wastewater, the technical problem to be solved urgently in the industry is formed, and the practical significance is very good.
Disclosure of Invention
Aiming at the chemical wastewater with high turbidity, high chroma, high salinity and refractory organic matters, the invention provides a zero-discharge treatment system for the chemical wastewater, which is used for realizing zero-discharge treatment of the chemical wastewater and recycling and treating the wastewater, salinity solid and waste gas in the treatment process.
The chemical wastewater zero-discharge treatment system comprises a falling-film evaporator, and a wastewater treatment unit, an exhaust gas treatment unit and a salinity treatment unit which are connected with the falling-film evaporator, wherein the wastewater treatment unit is connected with a steam outlet of the falling-film evaporator and is used for treating wastewater discharged by the falling-film evaporator; the vacuumizing port of the falling film evaporator is connected with an exhaust gas treatment unit; a discharge port of the falling-film evaporator is connected with a salinity treatment unit, and a desalting kettle of the salinity treatment unit is used for crystallizing and recovering solid salinity discharged by the falling-film evaporator;
a first heat exchanger is arranged in a first water separator of the wastewater treatment unit and used for preheating heat conducting oil by steam discharged by the falling film evaporator, and the preheated heat conducting oil is used for heating the falling film evaporator and the desalting kettle;
and one part of the effluent treated by the wastewater treatment unit is recycled for the desalting kettle, and the other part of the effluent is recycled for the activation and regeneration of the activated carbon and the ion exchange resin of the wastewater treatment unit.
The falling film evaporator comprises a plurality of first guide pipes, a plurality of second guide pipes and heating pipes which are respectively connected with the bottom ends of the first guide pipes and the second guide pipes, wherein the top ends of the first guide pipes are connected with a first water distributor which is connected with a feed inlet; the lower part of the first flow guide pipe is provided with a first liquid collecting tank, the first liquid collecting tank is connected with a second water distributor through a first pump and a pipeline, and the top end of the second flow guide pipe is connected with the second water distributor; the first guide pipe and the second guide pipe are obliquely arranged.
Optionally, the first honeycomb ducts and the second honeycomb ducts are respectively arranged in rows, that is, a plurality of first honeycomb ducts are arranged in a row in the horizontal direction, a plurality of second honeycomb ducts are arranged in a row in the horizontal direction, the two rows of honeycomb ducts are arranged side by side in the front-back direction, the inclination directions of the first honeycomb ducts and the second honeycomb ducts are opposite, that is, the first honeycomb ducts and the second honeycomb ducts are arranged in an X shape.
Further optionally, the falling film evaporator comprises a plurality of rows of first guide pipes and a plurality of rows of second guide pipes, the rows of first guide pipes and the rows of second guide pipes are arranged in a staggered mode, namely the rows of first guide pipes are respectively arranged on the front side and the rear side of the rows of second guide pipes, and the first guide pipes and the second guide pipes are arranged in an X shape.
Optionally, a first liquid collecting tank is arranged at the lower part of the first flow guide pipe and used for collecting another phase of liquid vertically falling from the first flow guide pipe, a plurality of through holes are formed in the surface of the first liquid collecting tank and used for enabling the first flow guide pipe to penetrate through the first liquid collecting tank, and the aperture of each through hole is slightly larger than the outer diameter of the first flow guide pipe, so that the liquid on the outer surface of the first flow guide pipe can flow to the heating pipe below the first flow guide pipe through the through holes.
Optionally, a second liquid collecting tank is arranged at the lower part of the second flow guide pipe and used for collecting another phase of liquid vertically falling from the second flow guide pipe, a plurality of through holes are formed in the surface of the second liquid collecting tank and used for the second flow guide pipe to penetrate through the second liquid collecting tank, and the aperture of each through hole is slightly larger than the outer diameter of the second flow guide pipe, so that the liquid on the outer surface of the second flow guide pipe can flow to the heating pipe below the second flow guide pipe through the through holes.
Optionally, the surface of the first flow guide pipe is made of a material having a strong attraction force with the polar liquid, such as glass, and a water phase is guided, so that the oil phase vertically falls into the first liquid collecting tank, and the oil phase is separated; the surface material of the second guide pipe is a material with strong attraction to non-polar liquid, such as plastic, so that the oil phase is guided, and the water phase vertically falls into the second liquid collecting tank, thereby separating the water phase. In practical application, the materials of the first guide pipe and the second guide pipe can be interchanged.
Optionally, a water phase steam outlet is arranged on the side wall of the falling film evaporator of the water phase steam area, and an oil phase steam outlet is arranged on the side wall of the falling film evaporator of the oil phase steam area.
Optionally, an evaporation heat source of the falling film evaporator is provided by heat conduction oil of a heat conduction oil preheating tank, a jacket is arranged around the outer wall of the falling film evaporator, an oil inlet is formed in the bottom of the jacket, an oil outlet is formed in the top of the jacket, the oil inlet and the oil outlet are connected with the heat conduction oil preheating tank, and heat conduction oil is introduced into the jacket and used for heating wastewater in the falling film evaporator.
The wastewater treatment unit comprises a first water separator, a first activated carbon processor, a cation resin processor, an anion resin processor, an EDI reactor and an ozone oxidation reactor which are sequentially connected, and the wastewater after the water phase steam of the falling-film evaporator is condensed is treated, so that the turbidity, the chromaticity and the organic matters which are difficult to degrade of the wastewater are further reduced.
Optionally, a water phase steam outlet of the falling film evaporator is connected with an inlet of a first water separator through a pipeline, the first water separator is connected with a first condenser, and the water phase steam is condensed; the oil phase steam outlet is connected with an inlet of a second water separator through a pipeline, the second water separator is connected with a second condenser to condense the oil phase steam, and an outlet of the second water separator is connected with a recovery tank for temporarily storing the oil phase liquid.
Optionally, a first heat exchanger is arranged inside the first water separator, a second heat exchanger is arranged inside the second water separator, hot steam of the first water separator is introduced into a first pipeline of the first heat exchanger, hot steam of the second water separator is introduced into a first pipeline of the second heat exchanger, an outlet of the heat conduction oil preheating tank is connected in parallel with second pipelines of the first heat exchanger and the second heat exchanger and is used for circularly exchanging heat between the hot steam collected in the first water separator and the second water separator and the heat conduction oil, the heat conduction oil is preheated, steam heat is fully utilized, and energy consumption for heating the heat conduction oil is reduced; after heat exchange, the second pipelines of the first heat exchanger and the second heat exchanger are connected with the oil inlet of the jacket and the oil inlet of the heating jacket of the desalting kettle. Preferably, the first heat exchanger and the second heat exchanger are plate heat exchangers.
Optionally, a first three-way control valve is arranged on a water inlet pipeline of the first activated carbon processor, a first end of the first three-way control valve is connected with the first water divider, and a second end of the first three-way control valve is connected with the first activated carbon processor.
Optionally, a top outlet of the first activated carbon processor is sequentially connected in series with the cation resin processor, the anion resin processor, the EDI reactor and the ozone oxidation reactor through pipelines, and the cation resin processor, the anion resin processor, the EDI reactor and the ozone oxidation reactor are all set to be bottom feeding and top discharging. The cation exchange resin and the anion exchange resin can be recycled through washing and regeneration treatment.
Optionally, a second three-way control valve is arranged on a water outlet pipe of the ozone oxidation reactor, a first end of the second three-way control valve is connected with the water outlet pipe of the ozone oxidation reactor, a second end of the second three-way control valve is connected with a water discharge outlet, a third end of the second three-way control valve is connected with a third end of the first three-way control valve, and the treated outlet water is used for backwashing activated carbon, cation exchange resin and anion exchange resin of the regenerated first activated carbon processor.
Optionally, the salinity processing unit comprises a tray dryer, a first desalination kettle and a second desalination kettle, a discharge hole is formed in the bottom of the falling-film evaporator, the tray dryer is connected with the tray dryer through a discharge valve and a closed spiral conveying pipeline, a discharge hole of the tray dryer is provided with a discharge valve, and the tray dryer is connected with the first desalination kettle through a pipeline.
Optionally, the salinity treatment unit further comprises a third water distributor, a third condenser, a fourth water distributor and a fourth condenser, wherein the top outlet of the first desalination kettle is sequentially connected with the third water distributor and the third condenser, the bottom outlet of the third water distributor is connected with the second desalination kettle, and the wastewater desalted by the first desalination kettle is input into the second desalination kettle for secondary crystallization and desalination, so that the desalination efficiency is improved; and the top outlet of the second desalting kettle is sequentially connected with a fourth water distributor and a fourth condenser, the bottom outlet of the fourth water distributor is connected with the third end of the first three-way control valve, and condensed water after secondary crystallization and desalting is input into the first activated carbon processor through the first three-way control valve to be continuously processed.
Optionally, a third end of the second three-way control valve is connected in parallel with a bottom outlet of the third water distributor and a pipeline between the disc dryer and the first desalting kettle through a pipeline, and is used for using effluent water treated by the wastewater treatment unit for water washing, dissolving and crystallizing purification supplementary water of the first desalting kettle and the second desalting kettle.
Optionally, the waste gas treatment unit includes vacuum pump and second active carbon treater, vacuum pump and second active carbon treater are connected gradually on the evacuation pipeline of falling film evaporator, take the waste gas of falling film evaporator out and carry out environmental protection and handle, prevent the polluted atmosphere.
Optionally, the second activated carbon processor is connected to the catalytic combustion device, and is used for desorption and cyclic utilization of activated carbon. The catalytic combustion apparatus of the present invention is a general apparatus capable of catalytically combusting activated carbon on the market, and is not particularly limited.
Optionally, the chemical wastewater zero-discharge treatment system disclosed by the invention can be integrally installed, a container-type integrated system is prepared according to needs, all parts and functional units of the system are arranged in the integrated box body, and all devices such as pumps, valves, heat-conducting oil preheating tanks, instruments and meters, electric control devices and pipe networks are centrally arranged in an operation room of the integrated box body, so that the operation, operation and maintenance of the system are facilitated, the modularization and integrated industrial treatment are facilitated, and the popularization and application values are high.
The chemical wastewater zero-discharge treatment system comprises the steps of heating, evaporating and concentrating chemical wastewater to be treated by the falling film evaporator, separating water phase steam and oil phase steam, recovering and treating an oil phase, condensing, separating and collecting evaporated water under the action of the first condenser and the first water separator, treating the water by the wastewater treatment unit, namely performing activated carbon adsorption, anion and cation exchange and EDI electric desalting and membrane separation treatment, performing ozone strong oxidation treatment and decoloration treatment on CODcr and chromaticity of the wastewater by the ozone oxidation reactor, discharging the treated effluent from a discharge water port by the second three-way control valve, wherein one part of the effluent can be reused for production procedures, and the other part of the effluent can be reused for water for backwashing, dissolving and crystallization purification supplement water of a desalting kettle of the system, and the other part of the effluent can be reused for activated carbon adsorption and anion and cation exchange resin regeneration, realizing zero discharge of the wastewater treatment unit.
Solid salinity discharges into in the waste water salinity treatment unit in first desalination cauldron and second desalination cauldron, through the crystallization under the different temperature control and desorption, and the design of two-stage crystallization purification can guarantee that solid salinity crystallization desorption gets more thoroughly in the waste water to improve salinity desorption purity and efficiency, the salt of desorption can regard as industrial raw materials to use, realizes resource comprehensive utilization, has effectively reduced solid waste's production, realizes salinity treatment unit's zero release.
In addition, the waste gas treatment unit is used for carrying out environment-friendly treatment on the waste gas pumped out by the falling film evaporator, so that the pollution to the atmosphere is prevented, and the zero emission of the waste gas treatment unit is realized. Meanwhile, the activated carbon, the cation resin and the anion resin used in the invention can be recycled by regeneration, thereby effectively reducing the generation of solid wastes. In conclusion, the chemical wastewater zero-discharge treatment system provided by the invention realizes the zero discharge of the chemical wastewater.
The chemical wastewater zero-discharge treatment system can adopt a container type integrated design, and is also beneficial to modularization and integration treatment, so that the system has great popularization and application values.
The falling-film evaporator provided by the invention is used for separating the water phase from the oil phase in the chemical wastewater aiming at the characteristics of high turbidity, high chroma, high salinity and existence of refractory organic matters in the coal chemical wastewater, and is beneficial to the subsequent treatment of the wastewater treatment unit on water phase steam.
Drawings
FIG. 1 is a process flow diagram of the chemical wastewater zero-discharge treatment system;
FIG. 2 is a schematic diagram of an integrated box type plane layout of the chemical wastewater zero-discharge treatment system;
FIG. 3 is a schematic structural view of a falling film evaporator;
fig. 4 is a sectional view a-a' of fig. 3.
In the attached drawings, 1 is a falling film evaporator, 2 is a first water separator, 3 is a first condenser, 4 is an electric drain valve, 5 is a first active carbon processor, 6 is a cation resin processor, 7 is a first three-way control valve, 8 is an anion resin processor, 9 is an EDI reactor, 10 is a second three-way control valve, 11 is an ozone oxidation reactor, 12 is a first heat exchanger, 13 is a heat conduction oil preheating tank, 14 is a tray dryer, 15 is a first desalting kettle, 16 is a third water separator, 17 is a third condenser, 18 is a second desalting kettle, 19 is a fourth water separator, 20 is a first salt outlet, 21 is a first control valve, 22 is a second salt outlet, 23 is a second control valve, 24 is a metering pump, 25 is a control valve, 26 is a vacuum pump, 27 is a second active carbon processor, 28 is a catalytic combustion device, 29 is a fourth condenser, 30 is an integrated box body, 31 is an operation room, 32 is a first guide pipe, 33 is a second guide pipe, 34 is a heating pipe, 35 is a first water distributor, 36 is a second water distributor, 37 is a first liquid collecting tank, 38 is a second liquid collecting tank, 39 is an evaporation area, 40 is a guide flow area, 41 is a separation plate, 42 is a water phase steam area, and 43 is an oil phase steam area.
Detailed Description
The embodiment provides a treatment system for zero discharge of chemical wastewater, which comprises a falling-film evaporator 1, and a wastewater treatment unit, an exhaust gas treatment unit and a salt treatment unit which are connected with the falling-film evaporator 1, wherein the wastewater treatment unit is connected with a steam outlet of the falling-film evaporator 1 and is used for treating wastewater discharged by the falling-film evaporator 1; the vacuumizing port of the falling film evaporator 1 is connected with an exhaust gas treatment unit; a discharge port of the falling-film evaporator 1 is connected with a salinity treatment unit, and a desalting kettle of the salinity treatment unit is used for crystallizing and recovering solid salinity discharged by the falling-film evaporator 1;
a first heat exchanger 12 is arranged in a first water separator 2 of the wastewater treatment unit and used for preheating heat conducting oil by steam discharged by the falling film evaporator 1, and the preheated heat conducting oil is used for heating the falling film evaporator 1 and the desalting kettle;
and one part of the effluent treated by the wastewater treatment unit is recycled for the desalting kettle, and the other part of the effluent is recycled for the activation and regeneration of the activated carbon and the ion exchange resin of the wastewater treatment unit.
The falling film evaporator 1 comprises a plurality of first guide pipes 32, a plurality of second guide pipes 33 and heating pipes 34 respectively connected with the bottom ends of the first guide pipes and the second guide pipes, the top end of each first guide pipe 32 is connected with a first water distributor 35, and the first water distributor 35 is connected with a feed inlet; the lower part of the first draft tube 32 is provided with a first liquid collecting tank 37, the first liquid collecting tank 37 is connected with a second water distributor 36 through a first pump and a pipeline, and the top end of the second draft tube 33 is connected with the second water distributor 36; the first draft tube 32 and the second draft tube 33 are obliquely arranged.
Aiming at the characteristics of high turbidity, high chroma, high salinity and refractory organic matters of the coal chemical industry wastewater, the falling film evaporator provided by the invention is characterized in that a first guide pipe 32 and a second guide pipe 33 are arranged above a heating pipe 34 for forming a liquid film and are used for separating a water phase and an oil phase in the chemical industry wastewater. Through the selection of different materials of the first draft tube 32 and the second draft tube 33, the draft tube has different acting forces with water phase and oil phase, and the draft tube is matched with the inclined draft tube to exert the acting force, so that liquid with strong attraction can flow down along the inclined draft tube, and liquid with weak attraction vertically falls down from a certain position of the draft tube under the action of gravity to fall into the first liquid collecting tank 37 and then is drained by another draft tube to flow down. Finally, the water phase and the oil phase flow through the heating pipes 34 connected below the respective draft tubes, and a liquid film is formed on the heating pipes 34 for evaporation separation.
Optionally, the first draft tubes 32 and the second draft tubes 33 are respectively arranged in rows, that is, a plurality of first draft tubes 32 are arranged in a row in the horizontal direction, a plurality of second draft tubes 33 are arranged in a row in the horizontal direction, the two draft tubes are arranged in parallel in the front and back direction, and the inclination directions of the first draft tubes 32 and the second draft tubes 33 are opposite, that is, the first draft tubes 32 and the second draft tubes 33 are arranged in an X shape.
Further optionally, the falling film evaporator 1 includes a plurality of rows of first guide pipes 32 and a plurality of rows of second guide pipes 33, the row of first guide pipes 32 and the row of second guide pipes 33 are arranged in a staggered manner, that is, the row of first guide pipes 32 is arranged on the front side and the rear side of the row of second guide pipes 33 respectively.
The arrangement mode of the guide pipes can utilize the space in the falling film evaporator to the maximum extent, and is particularly suitable for large-scale wastewater treatment systems, the first guide pipe 32 and the second guide pipe 33 with opposite inclination directions respectively guide the water phase and the oil phase to two different directions, and then the water phase and the oil phase are subjected to film formation evaporation along the heating pipes 34 which are respectively connected, namely, the design mode of X-shaped arrangement can be matched with the design of the first guide pipe 32 and the second guide pipe 33 to further separate the water phase and the oil phase.
The top end of the first guide pipe 32 is connected with a first water distributor 35, the first water distributor 35 is connected with a feed inlet, and the first water distributor 35 is used for introducing the feed of the falling film evaporator 1 into the first water distributor 35 and then uniformly flowing to the first guide pipe 32 from the first water distributor 35.
Each row of the first draft tubes 32 is correspondingly connected with one first water distributor 35, and preferably, the first water distributor 35 is in a long strip shape. The first water distributor 35 may be a water distributor of a falling film evaporator existing in the market, as long as the first flow guide pipes 32 arranged in rows are distributed with water, and this embodiment is not particularly limited.
Optionally, the falling film evaporator 1 includes a plurality of rows of first water distributors 35 corresponding to the plurality of rows of first flow guide pipes 32, and each row of first water distributors 35 is connected to one row of first flow guide pipes 32.
Optionally, the lower portion of the first flow guide pipe 32 is provided with a first liquid collecting tank 37 for collecting the liquid of the other phase vertically falling from the first flow guide pipe 32, the surface of the first liquid collecting tank 37 is provided with a plurality of through holes for the first flow guide pipe 32 to pass through the first liquid collecting tank 37, and the aperture of the through holes is slightly larger than the outer diameter of the first flow guide pipe 32, so that the liquid on the outer surface of the first flow guide pipe 32 can flow to the heating pipe 34 below the first flow guide pipe 32 through the through holes.
Alternatively, the first sump 37 is inclined such that the liquid in the first sump 37 naturally flows toward the first pump by gravity.
Further optionally, the end of the first catch basin 37 with the higher horizontal position is provided with an overflow weir to prevent liquid from overflowing the first catch basin 37 when too much liquid falls into the first catch basin 37 due to fluctuation of the feed rate.
Optionally, the first liquid collecting tank 37 is connected with the second water distributor 36 through a first pump and a pipeline, the top end of the second flow guide pipe 33 is connected with the second water distributor 36, the liquid collected by the first liquid collecting tank 37 is pumped into the second water distributor 36 through the first pump, distributed by the second water distributor 36 and flows down along the second flow guide pipe 33, and then flows through the heating pipe 34 below the second flow guide pipe 33 to form a film and evaporate, so that the water phase and the oil phase are separated.
Optionally, each row of second draft tubes 33 is correspondingly connected with one second water distributor 36, and preferably, the second water distributor 36 is in a strip shape. The second water distributor 36 may be a water distributor of a falling film evaporator existing in the market, as long as the water distributor can distribute water for the second flow guide pipes 33 arranged in rows, and the embodiment is not particularly limited.
Optionally, the falling film evaporator 1 includes a plurality of rows of second water distributors 36 corresponding to the plurality of rows of second draft tubes 33, each row of second water distributors 36 is correspondingly connected to one row of second draft tubes 33, the plurality of rows of second water distributors 36 and the plurality of rows of first water distributors 35 are arranged in a staggered manner, that is, one row of first water distributors 35 is respectively arranged on the front side and the rear side of one row of second water distributors 36.
Optionally, a second liquid collecting tank 38 is disposed below the second flow guiding pipe 33 for collecting the liquid of the other phase falling vertically from the second flow guiding pipe 33, a plurality of through holes are disposed on the surface of the second liquid collecting tank 38 for the second flow guiding pipe 33 to pass through the second liquid collecting tank 38, and the aperture of the through holes is slightly larger than the outer diameter of the second flow guiding pipe 33, so that the liquid on the outer surface of the second flow guiding pipe 33 can flow to the heating pipe 34 below the second flow guiding pipe 33 through the through holes.
Alternatively, the second sump 38 is inclined such that liquid in the second sump 38 naturally flows to the second pump under the influence of gravity.
Further optionally, an overflow weir is disposed at the higher end of the second liquid collecting tank 38, so as to prevent the liquid from overflowing the second liquid collecting tank 38 when the second liquid guiding pipe 33 has a fluctuating liquid flow rate and causes excessive liquid to fall into the second liquid collecting tank 38.
Optionally, the second liquid collecting tank 38 is connected to the first water distributor 35 through a second pump and a pipeline, and the liquid collected by the second liquid collecting tank 38 is pumped into the first water distributor 35 through the second pump, in the invention, a small amount of liquid of the other phase separated by the second flow guide pipe 33 is conveyed back to the first water distributor 35, and is distributed by the first water distributor 35 again and flows down along the first flow guide pipe 32, so that the feed liquid is recovered as much as possible and is fully separated.
Preferably, the first and second sumps 37 and 38 have the same height, and the lower surfaces of the first and second sumps 37 and 38 are butted against each other so that there is no gap between the first and second sumps 37 and 38. It is further preferred that the first sump 37 and/or the second sump 38 are in contact with the inner wall of the falling film evaporator 1, i.e. the first sump 37 and the second sump 38 divide the falling film evaporator 1 into two regions, the heating tubes 34 being located in the lower evaporation zone 39, so that the vapour in the evaporation zone cannot enter the upper flow guide 40, where the first flow guide 32 and the second flow guide 33 are located, thereby achieving separation of feed from vapour.
Optionally, the surface of the first flow guide pipe 32 is made of glass, and water phase is guided, so that the oil phase vertically falls into the first liquid collecting tank 37, and the oil phase is separated; the surface material of the second guide pipe 33 is plastic, and the oil phase is guided, so that the water phase vertically falls into the second liquid collecting tank 38, and the water phase is separated. In practical applications, the materials of the first duct 32 and the second duct 33 may be interchanged.
In one embodiment of the present invention, the falling film evaporator 1 comprises a first guide pipe 32 and a second guide pipe 33, which are arranged in an X shape, a heating pipe 34 is connected below the first guide pipe 32 and the second guide pipe 33 respectively for film-forming evaporation, the first guide pipe 32 is a glass pipe and guides a water phase, and the second guide pipe 33 is a plastic pipe and guides an oil phase; the top end of the first flow guide pipe 32 is connected with a first water distributor 35, the first water distributor 35 is connected with a feed inlet, a first liquid collecting tank 37 is arranged at the lower part of the first flow guide pipe 32, oil phase liquid vertically falls into the first liquid collecting tank 37 from the first flow guide pipe 32 while water phase is guided, and the water phase flows down from the through hole of the first liquid collecting tank 37; the first liquid collecting tank 37 is obliquely arranged, the oil phase naturally flows to the first pump, flows back to the second water distributor 36 through the first pump and flows to the second flow guide pipe 33 through the second water distributor 36, a small amount of water-phase liquid vertically falls into the second liquid collecting tank 38 through the second flow guide pipe 33 while the oil phase is guided, and the oil phase flows down from the through hole of the second liquid collecting tank 38; the second liquid collecting tank 38 is disposed obliquely, and the water phase naturally flows to the second pump, flows back to the first water distributor 35 by the second pump, and flows to the first flow guide pipe 32 from the first water distributor 35.
In another embodiment of the present invention, the falling film evaporator 1 comprises a row of first guide pipes 32 and a row of second guide pipes 33, which are arranged in a front-to-back manner and in a plurality of X-shaped configurations, wherein heating pipes 34 are respectively connected below the first guide pipes 32 and the second guide pipes 33 for film-forming evaporation, the first guide pipes 32 are plastic pipes and guide oil phase, and the second guide pipes 33 are glass pipes and guide water phase; the top end of the first flow guide pipe 32 is connected with a first water distributor 35, the first water distributor 35 is connected with a feed inlet, the lower part of the first flow guide pipe 32 is provided with a first liquid collecting tank 37, when the oil phase is guided, the water phase liquid vertically falls into the first liquid collecting tank 37 from the first flow guide pipe 32, and the oil phase flows down from the through hole of the first liquid collecting tank 37; the first liquid collecting tank 37 is obliquely arranged, the water phase naturally flows to the first pump, flows back to the second water distributor 36 through the first pump and flows to the second flow guide pipe 33 through the second water distributor 36, a small amount of oil-phase liquid vertically falls into the second liquid collecting tank 38 through the second flow guide pipe 33 while the water phase is drained, and the water phase flows down from the through hole of the second liquid collecting tank 38; the second liquid collecting tank 38 is disposed obliquely, and the oil phase naturally flows to the second pump, flows back to the first water distributor 35 by the second pump, and flows to the first flow guide pipe 32 from the first water distributor 35.
In another embodiment of the present invention, the falling film evaporator 1 comprises a plurality of rows of first guide pipes 32 and a plurality of rows of second guide pipes 33, which are arranged in a staggered manner in front and back and in a plurality of rows of X-shaped arrangements, wherein heating pipes 34 are respectively connected below the first guide pipes 32 and the second guide pipes 33 for film-forming evaporation, the first guide pipes 32 are plastic pipes and guide oil phases, and the second guide pipes 33 are glass pipes and guide water phases; the first collecting groove 37 and the second collecting groove 38 are matched with the first guide pipe 32 and the second guide pipe 33 and are arranged in a staggered mode from front to back; the first water distributor 35 and the second water distributor 36 are also arranged in a front-back staggered manner in cooperation with the first draft tube 32 and the second draft tube 33.
The first guide pipe 32 and the second guide pipe 33 are arranged in an X shape, so that the positions of the heating pipes 34 below the first guide pipe 32 and the second guide pipe 33 are separated, liquid with different properties is formed into a film and is evaporated on the heating pipes in respective areas, in order to separate water phase steam and oil phase steam, a partition plate 41 is arranged between the heating pipes connected with the first guide pipe 32 and the heating pipes connected with the second guide pipe 33, the top end of the partition plate 41 is fixedly connected with the lower surfaces of the first liquid collecting tank 37 and the second liquid collecting tank 38, and the evaporation area 39 is divided into a water phase steam area 42 and an oil phase steam area 43, so that the water phase steam and the oil phase steam are respectively controlled in the corresponding areas.
The side wall of the falling film evaporator of the water phase steam area 42 is provided with a water phase steam outlet, and the side wall of the falling film evaporator of the oil phase steam area 43 is provided with an oil phase steam outlet.
For example, one or more rows of heating pipes 34 correspondingly connected below one or more rows of first guide pipes 32 are positioned on the left side in the falling-film evaporator, one or more rows of heating pipes on the rightmost side are designated as R1, one or more rows of heating pipes 34 correspondingly connected below one or more rows of second guide pipes 33 are positioned on the right side in the falling-film evaporator, one or more heating pipes on the leftmost side are designated as R2, a partition plate 41 is arranged between R1 and R2, the top end of the partition plate 41 is fixedly connected with the lower surfaces of the first header tank 37 and the second header tank 38, the falling-film evaporator 1 is divided into an evaporation area 39 and a flow guide area 40, the side edge of the partition plate 41 is fixedly connected with the side wall of the falling-film evaporator 1, and the evaporation area 39 is divided into a water phase steam area 42 and an oil phase steam.
According to the falling film evaporator, the guide pipe is arranged above the heating pipe 34, the water phase and the oil phase in the chemical wastewater are separated by utilizing the difference of the attractive force of the water phase and the oil phase and the inclined guide pipes made of different materials, and the separated liquid flows to the corresponding heating pipes to be evaporated. The first liquid collecting groove 37 and the second liquid collecting groove 38 are matched with the first guide pipe 32 and the second guide pipe 33, and liquid is recovered and separated; the partition plate 41 cooperates with the first and second sumps 37 and 38 to divide the falling film evaporator 1 into a flow guiding region 40, a water phase vapor region 42 and an oil phase vapor region 43, so that different vapors can be discharged through the respective corresponding vapor outlets, avoiding secondary mixing. The invention improves the falling-film evaporator, so that the falling-film evaporator can directly feed materials without collecting waste water in advance and standing to separate a water phase and an oil phase, and is beneficial to a large-scale continuous production process.
An evaporation heat source of the falling-film evaporator 1 is provided by heat conduction oil of a heat conduction oil preheating tank 13, a jacket is arranged on the periphery of the outer wall of the falling-film evaporator 1, an oil inlet is formed in the bottom of the jacket, an oil outlet is formed in the top of the jacket, the oil inlet and the oil outlet are connected with the heat conduction oil preheating tank 13, heat conduction oil is introduced into the jacket and used for heating wastewater in the falling-film evaporator 1. A temperature controller is arranged in the jacket and used for controlling the heating temperature of the falling film evaporator 1.
The wastewater treatment unit comprises a first water separator 2, a first activated carbon processor 5, a cation resin processor 6, an anion resin processor 8, an EDI reactor 9 and an ozone oxidation reactor 11 which are connected in sequence, and is used for treating wastewater after water phase steam of the falling-film evaporator 1 is condensed, so that the turbidity, the chromaticity and refractory organics of the wastewater are further reduced.
Optionally, an aqueous phase steam outlet of the falling film evaporator 1 is connected with an inlet of a first water separator 2 through a pipeline, and the first water separator 2 is connected with a first condenser 3 to condense aqueous phase steam; the oil phase steam outlet is connected with an inlet of a second water separator through a pipeline, the second water separator is connected with a second condenser to condense the oil phase steam, and an outlet of the second water separator is connected with a recovery tank for temporarily storing oil phase liquid.
Optionally, a first heat exchanger 12 is arranged inside the first water separator 2, a second heat exchanger is arranged inside the second water separator, hot steam of the first water separator 2 is introduced into a first pipeline of the first heat exchanger 12, hot steam of the second water separator is introduced into a first pipeline of the second heat exchanger, an outlet of the heat conduction oil preheating tank 13 is connected in parallel with a second pipeline of the first heat exchanger 12 and the second heat exchanger, and is used for performing circulating heat exchange between the hot steam collected in the first water separator 2 and the second water separator and heat conduction oil, preheating the heat conduction oil, fully utilizing steam heat, and reducing energy consumption for heating the heat conduction oil; after heat exchange, the second pipelines of the first heat exchanger 12 and the second heat exchanger are connected with the oil inlet of the jacket and the oil inlet of the heating jacket of the desalting kettle. Preferably, the first heat exchanger 12 and the second heat exchanger are plate heat exchangers.
Optionally, an electric drain valve 4 is arranged at the bottom of the first water separator 2, and is connected to the bottom inlet of the first activated carbon processor 5 through a pipeline and a water feed pump installed on the pipeline, so that the wastewater condensed from the water phase steam discharged from the falling film evaporator 1 is input to the first activated carbon processor 5 for processing. The activated carbon in the first activated carbon processor 5 is granular carbon, and can be regenerated through backwashing, so that the activated carbon can be recycled.
Optionally, a first three-way control valve 7 is arranged on a water inlet pipeline of the first activated carbon processor 5, a first end of the first three-way control valve 7 is connected with the first water divider 2, and a second end of the first three-way control valve is connected with the first activated carbon processor 5.
After the chemical wastewater is subjected to reduced pressure distillation by the falling film evaporator 1 and is condensed by the first condenser 3 and separated and collected by the first water divider 2, salt and organic matters in the chemical wastewater are primarily separated from a wastewater body, and primary separation and purification treatment is completed; and the waste water after separation is adsorbed by the first active carbon treater 5, and by utilizing the structure of micropores in the active carbon and the characteristic of large surface tension, pollutants such as particles, salt suspended matters, partial organic matters and the like in the waste water are further adsorbed, so that the turbidity and the chromaticity of the water body can be effectively improved, the CODcr content of the waste water is reduced, and the secondary separation and purification treatment is completed.
Optionally, the top outlet of the first activated carbon processor 5 is sequentially connected in series with the cation resin processor 6, the anion resin processor 8, the EDI reactor 9 and the ozone oxidation reactor 11 through a pipeline, and the cation resin processor 6, the anion resin processor 8, the EDI reactor 9 and the ozone oxidation reactor 11 are all set to be bottom feeding and top discharging. The cation exchange resin and the anion exchange resin can be recycled through washing and regeneration treatment.
Optionally, a second three-way control valve 10 is arranged on a water outlet pipe of the ozone oxidation reactor 11, a first end of the second three-way control valve 10 is connected with the water outlet pipe of the ozone oxidation reactor 11, a second end of the second three-way control valve is connected with a water discharge outlet, a third end of the second three-way control valve is connected with a third end of the first three-way control valve 7, and the treated outlet water is used for backwashing the activated carbon, the cation exchange resin and the anion exchange resin of the regenerated first activated carbon processor 5.
After the wastewater is subjected to secondary separation and purification treatment, the wastewater is respectively introduced into a cation resin processor 6 and an anion resin processor 8, and cation and anion pollutants in the water body are removed by utilizing the ion exchange effect of the resins, so that the salt content in the water body can be further reduced, and the tertiary separation and purification treatment is completed; then the wastewater is introduced into an EDI reactor for electric desalting and membrane separation treatment, so that the water body is subjected to deep desalting and purification, and four-stage separation and purification treatment is completed; finally, the wastewater is treated by ozone oxidation in an ozone oxidation reactor 11 to degrade and remove CODcr and chromaticity of the wastewater, thereby completing five-stage separation and purification treatment.
After the five-stage separation and purification treatment, the effluent suspended substance is less than 30mg/L, the chroma (platinum cobalt) is less than 30, the sulfate is less than 250mg/L, and the total soluble solid is less than 1000mg/L, CODcr and can reach below 10mg/L, thereby meeting the recycling standard of the urban sewage recycling industrial water quality (GB/T19923-2005) and being reused in the production process.
The salinity treatment unit comprises a tray dryer 14, a first desalination kettle 15 and a second desalination kettle 18, a discharge hole is formed in the bottom of the falling film evaporator 1, the tray dryer 14 is connected with the tray dryer through a discharge valve and a closed spiral conveying pipeline, and a discharge valve is arranged at the discharge hole of the tray dryer 14 and connected with the first desalination kettle 15 through a pipeline.
Preferably, a heating coil and a temperature controller are arranged in the disc dryer 14, and heat conducting oil is communicated with the inside of the heating coil.
Optionally, the salinity treatment unit further comprises a third water distributor 16, a third condenser 17, a fourth water distributor 19 and a fourth condenser 29, the top outlet of the first desalting kettle 15 is sequentially connected with the third water distributor 16 and the third condenser 17, the bottom outlet of the third water distributor 16 is connected with the second desalting kettle 18, the wastewater desalted by the first desalting kettle 15 is input into the second desalting kettle 18 for secondary crystallization and desalination, and the desalting efficiency is improved; the top outlet of the second desalting kettle 18 is sequentially connected with a fourth water distributor 19 and a fourth condenser 29, the bottom outlet of the fourth water distributor 19 is connected with the third end of a first three-way control valve 7, and the condensed water after secondary crystallization and desalting is input into the first active carbon processor 5 through the first three-way control valve 7 to be continuously processed.
Optionally, stirring devices are arranged inside the first desalting kettle 15 and the second desalting kettle 18, a first salt outlet 20 and a first control valve 21 are arranged at the bottom of the first desalting kettle 15, and a second salt outlet 22 and a second control valve 23 are arranged at the bottom of the second desalting kettle 18.
Optionally, a third end of the second three-way control valve 10 is connected in parallel with an outlet at the bottom of the third water separator 16 and a pipeline between the pan dryer 14 and the first desalting kettle 15 through a pipeline, and is configured to use the effluent treated by the wastewater treatment unit for water washing, dissolving, and crystallizing purification supplementary water of the first desalting kettle 15 and the second desalting kettle 18.
Preferably, a metering pump is provided on a pipeline connected to the third end of the second three-way control valve 10, and the metering pump can supplement the water according to the water amount required by the actual desalting process.
Optionally, the waste gas treatment unit comprises a vacuum pump 26 and a second activated carbon processor 27, the vacuum pump 26 and the second activated carbon processor 27 are sequentially connected to the vacuum-pumping pipeline of the falling-film evaporator 1, and waste gas of the falling-film evaporator 1 is pumped out and subjected to environmental protection treatment to prevent atmosphere pollution.
Optionally, the second activated carbon processor 27 is connected to the catalytic combustion device 28, and is configured to desorb and recycle activated carbon. The catalytic combustion apparatus 28 of the present invention is a general apparatus for catalytically combusting activated carbon on the market, and is not particularly limited.
Optionally, the activated carbon is honeycomb activated carbon, preferably coconut shell activated carbon, and the particle size of the activated carbon is 0.1-1 cm.
The chemical wastewater zero-discharge treatment system can be integrally installed, a container type integrated system is prepared according to needs, all parts and functional units of the system are arranged in the integrated box body, and all devices such as pumps, valves, heat-conducting oil preheating tanks, instruments, electric control and the like and pipe networks are centrally arranged in an operation room of the integrated box body 30, so that the operation, operation and maintenance of the system are facilitated, modularization and integrated industrial treatment are facilitated, and the popularization and application values are high.
For example, the chemical wastewater zero-discharge treatment system is distributed in rows, the first row is sequentially provided with the falling film evaporator 1, the drying disc 14, the first desalting kettle 15 and the second desalting kettle 18, the second row is sequentially provided with the first condenser 3, the second condenser, the third condenser 17, the fourth condenser 29, the first activated carbon processor 5 and the second activated carbon processor 27, the third row is sequentially provided with the cation resin processor 6, the anion resin processor 8 and the EDI reactor 9, the fourth row is provided with the ozone oxidation reactor 11, and the fifth row is provided with the operating room 31, so that all the devices are integrally installed in the integrated box body 30, the space is saved, and the integration and modularization are realized.
Claims (10)
1. The treatment system for zero discharge of chemical wastewater is characterized by comprising a falling-film evaporator, and a wastewater treatment unit, an exhaust gas treatment unit and a salinity treatment unit which are connected with the falling-film evaporator;
the waste water treatment unit is connected with a steam outlet of the falling film evaporator and is used for treating waste water discharged by the falling film evaporator; the vacuumizing port of the falling film evaporator is connected with an exhaust gas treatment unit; a discharge port of the falling-film evaporator is connected with a salinity treatment unit, and a desalting kettle of the salinity treatment unit is used for crystallizing and recovering solid salinity discharged by the falling-film evaporator;
a first heat exchanger is arranged in a first water separator of the wastewater treatment unit and used for preheating heat conducting oil by steam discharged by the falling film evaporator, and the preheated heat conducting oil is used for heating the falling film evaporator and the desalting kettle;
and one part of the effluent treated by the wastewater treatment unit is recycled for the desalting kettle, and the other part of the effluent is recycled for the activation and regeneration of the activated carbon and the ion exchange resin of the wastewater treatment unit.
2. The chemical wastewater zero-emission treatment system of claim 1, wherein the falling film evaporator comprises a plurality of first guide pipes, a plurality of second guide pipes and heating pipes respectively connected with the bottom ends of the first guide pipes and the second guide pipes;
the top end of the first flow guide pipe is connected with a first water distributor, and the first water distributor is connected with a feed inlet;
the lower part of the first flow guide pipe is provided with a first liquid collecting tank, the first liquid collecting tank is connected with a second water distributor through a first pump and a pipeline, and the top end of the second flow guide pipe is connected with the second water distributor;
the first guide pipe and the second guide pipe are obliquely arranged.
3. The chemical wastewater zero-discharge treatment system of claim 2, wherein the first flow guide pipes and the second flow guide pipes are respectively arranged in rows, a plurality of first flow guide pipes are arranged in a row in the horizontal direction, a plurality of second flow guide pipes are arranged in a row in the horizontal direction, and the two flow guide pipes are arranged in parallel in the front and back direction; the first guide pipe and the second guide pipe are arranged in an X shape; alternatively, the first and second electrodes may be,
the falling film evaporator comprises a plurality of rows of first guide pipes and a plurality of rows of second guide pipes, the rows of first guide pipes and the rows of second guide pipes are arranged in a staggered mode, the rows of first guide pipes are arranged on the front side and the rear side of the rows of second guide pipes respectively, and the first guide pipes and the second guide pipes are arranged in an X shape.
4. The chemical wastewater zero-discharge treatment system of claim 3, wherein a first liquid collecting tank is arranged at the lower part of the first flow guide pipe and used for collecting the liquid of the other phase which falls vertically from the first flow guide pipe;
the surface of the first liquid collecting tank is provided with a plurality of through holes for the first flow guide pipe to pass through the first liquid collecting tank, and the aperture of the through holes is slightly larger than the outer diameter of the first flow guide pipe, so that liquid on the outer surface of the first flow guide pipe can flow to the heating pipe below the first flow guide pipe through the through holes;
the lower part of the second guide pipe is provided with a second liquid collecting tank for collecting the other phase of liquid vertically falling from the second guide pipe;
the surface of the second liquid collecting tank is provided with a plurality of through holes for the second flow guide pipe to pass through the second liquid collecting tank, and the aperture of the through holes is slightly larger than the outer diameter of the second flow guide pipe, so that the liquid on the outer surface of the second flow guide pipe can flow to the heating pipe below the second flow guide pipe through the through holes.
5. The chemical wastewater zero-discharge treatment system as claimed in claim 4, wherein the surface material of the first flow guide pipe is a material having strong attraction with polar liquid, and the water phase is guided, so that the oil phase vertically falls into the first liquid collecting tank, and the oil phase is separated;
the surface material of the second guide pipe is a material with strong attraction to the nonpolar liquid, and the oil phase is guided, so that the water phase vertically falls into the second liquid collecting tank, and the water phase is separated.
6. The chemical wastewater zero-discharge treatment system of claim 1, wherein the wastewater treatment unit comprises a first water separator, a first activated carbon processor, a cation resin processor, an anion resin processor, an EDI reactor and an ozone oxidation reactor which are connected in sequence, and the wastewater after condensation of the aqueous phase steam of the falling film evaporator is treated to further reduce turbidity, chromaticity and refractory organics of the wastewater.
7. The chemical wastewater zero-discharge treatment system of claim 6, wherein a first three-way control valve is arranged on the water inlet pipeline of the first activated carbon processor, a first end of the first three-way control valve is connected with the first water separator, and a second end of the first three-way control valve is connected with the first activated carbon processor;
and a second three-way control valve is arranged on a water outlet pipe of the ozone oxidation reactor, the first end of the second three-way control valve is connected with the water outlet pipe of the ozone oxidation reactor, the second end of the second three-way control valve is connected with a water discharge outlet, the third end of the second three-way control valve is connected with the third end of the first three-way control valve, and the treated outlet water is used for backwashing the activated carbon, the cation exchange resin and the anion exchange resin of the regenerated first activated carbon processor.
8. The treatment system for zero discharge of chemical wastewater according to claim 7, wherein the salinity treatment unit comprises a disc drying machine, a first desalination kettle and a second desalination kettle, a discharge hole is formed in the bottom of the falling film evaporator and connected with the disc drying machine, and a discharge hole of the disc drying machine is connected with the first desalination kettle through a pipeline.
9. The chemical wastewater zero-discharge treatment system of claim 8, wherein the salinity treatment unit further comprises a third water distributor, a third condenser, a fourth water distributor and a fourth condenser;
the top outlet of the first desalting kettle is sequentially connected with a third water distributor and a third condenser, the bottom outlet of the third water distributor is connected with a second desalting kettle, and the wastewater desalted by the first desalting kettle is input into the second desalting kettle for secondary crystallization and desalting, so that the desalting efficiency is improved;
and the top outlet of the second desalting kettle is sequentially connected with a fourth water distributor and a fourth condenser, the bottom outlet of the fourth water distributor is connected with the third end of the first three-way control valve, and condensed water after secondary crystallization and desalting is input into the first activated carbon processor through the first three-way control valve to be continuously processed.
10. The chemical wastewater zero-discharge treatment system of claim 9, wherein a third end of the second three-way control valve is connected in parallel with a bottom outlet of the third water distributor and a pipeline between the drying tray and the first desalting kettle through a pipeline, and is used for using effluent treated by the wastewater treatment unit for water washing, dissolving and crystallizing purification supplementary water of the first desalting kettle and the second desalting kettle.
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