CN111056580A - Vinyl sulfate waste water treatment and recovery system - Google Patents
Vinyl sulfate waste water treatment and recovery system Download PDFInfo
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- CN111056580A CN111056580A CN201911267207.4A CN201911267207A CN111056580A CN 111056580 A CN111056580 A CN 111056580A CN 201911267207 A CN201911267207 A CN 201911267207A CN 111056580 A CN111056580 A CN 111056580A
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- VEWLDLAARDMXSB-UHFFFAOYSA-N ethenyl sulfate;hydron Chemical compound OS(=O)(=O)OC=C VEWLDLAARDMXSB-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000011084 recovery Methods 0.000 title claims abstract description 19
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 168
- 238000009835 boiling Methods 0.000 claims abstract description 63
- 239000002351 wastewater Substances 0.000 claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 239000012530 fluid Substances 0.000 claims description 67
- 239000013078 crystal Substances 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims 1
- 230000008719 thickening Effects 0.000 claims 1
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 30
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 24
- 239000012452 mother liquor Substances 0.000 description 16
- 239000000243 solution Substances 0.000 description 12
- 150000003839 salts Chemical class 0.000 description 10
- 238000001704 evaporation Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000002131 composite material Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 6
- 238000004146 energy storage Methods 0.000 description 6
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000008235 industrial water Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 241000060350 Citronella moorei Species 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
-
- 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
- C02F1/048—Purification of waste water by evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/36—Organic compounds containing halogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
Abstract
The invention discloses a vinyl sulfate production wastewater treatment and recovery system, which comprises a wastewater tank, a low boiling point separator and a main gas-liquid separator, solid-liquid gas-liquid separator and high boiling point gas-liquid separator, the waste water case links to each other with the low boiling point separator water inlet through first pipeline, the main gas-liquid separator inlet of low boiling point separator delivery port links to each other, main gas-liquid separator liquid outlet passes through the second tube coupling solid-liquid gas-liquid separator inlet, waste water case and high boiling point gas-liquid separator inlet are connected respectively to solid-liquid gas-liquid separator liquid outlet, the first condensing system of low boiling point separator gas exit linkage, high boiling point gas-liquid separator gas exit linkage second condensing system, main gas-liquid separator gas exit is connected with steam heat exchange system steam inlet, main gas-liquid separator is equipped with the inner loop, first pipeline and second pipeline insert steam heat exchange system respectively. The advantages are that: realizing low discharge of wastewater generated in the production of the vinyl sulfate and resource recovery.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a treatment and recovery system for wastewater generated in vinyl sulfate production.
Background
With the increasing demand of mobile power supplies, the emerging lithium battery industry is highly valued, the output of the lithium battery is increased sharply, in order to guarantee and improve the use effect and the service life of the lithium battery, an additive named as vinyl sulfate (DTD for short) is required to be added into the lithium battery electrolyte, 10 tons of wastewater are generated when 1 ton of DTD is produced, and millions of tons are generated nationwide every year; the waste water contains various salts, wherein the waste water contains 20% of sodium chloride, 3% of sodium sulfate and 1% of sodium hypochlorite, and contains COD of a plurality of organic matters up to 4000-50000 mg/l, 2% of dichloromethane and 2% of glycol, and also contains other organic matters and metal ions, the conventional waste water biochemical treatment technology cannot be solved, the evaporation concentration device is adopted, scaling is easy to occur to the equipment, the crystallization is blocked, the device cannot be used, in addition, the device cannot run continuously due to different substances with low boiling point and high boiling point in the waste water, resources cannot be recycled, the treated water cannot reach the standard, and the operation energy consumption is high. Belongs to environment-friendly qualitative waste water with strong corrosivity and toxicity and belongs to a type which is extremely difficult to treat, and an effective solution is not available in the field at present. Many enterprises forced to produce can only store the wastewater first, so that some enterprises can find solutions in the future, and the amount of the wastewater in some enterprises is thousands of tons and is too heavy.
Disclosure of Invention
The invention aims to provide a foaming soap box which effectively overcomes the defects of the prior art.
The technical scheme for solving the technical problems is as follows:
the utility model provides a vinyl sulfate waste water treatment and recovery system, including the waste water case, low boiling point separator, main gas-liquid separator, solid-liquid gas-liquid separator, high boiling point gas-liquid separator and steam heat exchange system, the delivery port of the above-mentioned waste water case passes through the first pipeline and links to each other with the water inlet of the above-mentioned low boiling point separator, the delivery port of the above-mentioned low boiling point separator passes through the pipeline and links to each other with the inlet of the above-mentioned main gas-liquid separator, the liquid outlet of the above-mentioned main gas-liquid separator passes through the inlet of second pipe connection above-mentioned solid-liquid gas-liquid separator, the liquid outlet of the above-mentioned solid-liquid gas-liquid separator passes through the water inlet of the above-mentioned waste water case and the inlet of the above-mentioned high boiling point gas-liquid separator of pipe connection respectively, the gas outlet of the above-mentioned low boiling point separator connects first condensing, the main gas-liquid separator is provided with an internal circulation loop for internal liquid circulation, and the internal circulation loop, the first pipeline and the second pipeline are respectively connected into the steam heat exchange system and used for exchanging heat with the steam heat exchange system.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the steam heat exchange system comprises a first plate evaporator, a condensed water main tank, a first plate heat exchanger and a second plate heat exchanger, wherein a steam inlet is formed by a fluid inlet at the hot side of the first plate evaporator, the steam inlet is respectively externally connected with a steam air source and a gas outlet of the main gas-liquid separator through pipelines, the fluid outlet at the hot side of the first plate evaporator is connected with the inlet of the condensed water main tank through a pipeline, the outlet of the condensed water main tank is connected with the fluid inlet at the hot side of the first plate heat exchanger through a pipeline, the fluid inlet and the outlet at the cold side of the first plate heat exchanger are respectively communicated with the first pipeline, the fluid inlet and the outlet at the cold side of the second plate heat exchanger are respectively communicated with the first pipeline, and the fluid inlet and the outlet of the second plate heat exchanger are respectively communicated with the second pipeline, and the fluid inlet and the fluid outlet of the cold side of the first plate-type evaporator are respectively in liquid communication with the interior of the main gas-liquid separator through pipelines, and form the internal circulation loop.
Further, a steam compressor is provided in a pipe connecting the steam inlet and the gas outlet of the main gas-liquid separator.
Furthermore, an automatic water replenishing device is arranged on a pipeline for communicating the steam inlet with the gas outlet of the main gas-liquid separator.
Further, the first condensing system comprises a first plate-type condenser, the gas outlet of the low-boiling separator is sequentially connected with the fluid inlet and the fluid outlet of the hot side of the first plate-type condenser through pipelines, and the fluid inlet and the fluid outlet of the cold side of the first plate-type condenser are respectively externally connected with a condensed water circulating system.
Further, the first condensing system further comprises a balance tank, a fluid outlet at the hot side of the first plate type condenser is connected with the interior of the balance tank through a pipeline, and the top of the balance tank is provided with a vacuum for extracting air in the balance tank.
And a crystal growing tank for adjusting the thick liquid is communicated with a pipe section between the fluid outlet at the hot side of the second plate heat exchanger and the solid-liquid-gas-liquid separator on the second pipeline.
Further, the second condensing system comprises a second plate-type condenser, and a gas outlet of the high-boiling-point gas-liquid separator is sequentially connected with a fluid inlet and a fluid outlet at the hot side of the second plate-type condenser through a pipeline.
Furthermore, an auxiliary heat exchange system for supplementing heat energy to the fluid is connected to a pipeline between the liquid outlet of the solid-liquid gas-liquid separator and the liquid inlet of the high-boiling point gas-liquid separator.
Further, the auxiliary heat exchange system comprises a second plate-type evaporator, a fluid inlet and a fluid outlet on the cold side of the second plate-type evaporator are respectively connected to a pipeline between a liquid outlet of the solid-liquid gas-liquid separator and a liquid inlet of the high-boiling-point gas-liquid separator, and a fluid inlet on the hot side of the second plate-type evaporator is externally connected with a steam air source.
The invention has the beneficial effects that: the system is reasonable in design, low discharge of the wastewater generated in the production of the vinyl sulfate is realized, and resources are recycled; the whole system has low energy consumption, and the emission reduction and resource recovery create benefits for enterprises and greatly reduce the pollution of waste water to the environment.
Drawings
FIG. 1 is a system configuration diagram of a wastewater treatment and recovery system for vinyl sulfate production according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the system comprises a waste water tank, 2, a low boiling point separator, 3, a main gas-liquid separator, 4, an auxiliary heat exchange system, 5, a solid-liquid gas-liquid separator, 6, a high boiling point gas-liquid separator, 7, a first condensing system, 8, a second condensing system, 9, a steam heat exchange system, 41, a second plate evaporator, 51, a Yangyu tank, 71, a first plate condenser, 72, a balance tank, 81, a second plate condenser, 91, a first plate evaporator, 92, a condensed water main tank, 93, a first plate heat exchanger, 94, a second plate heat exchanger, 95, a steam compressor, 96, an automatic water replenishing device, 721 and a vacuum pump.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example (b): as shown in fig. 1, the system for treating and recovering wastewater from the production of vinyl sulfate according to the embodiment is characterized in that: the system comprises a wastewater tank 1, a low boiling point separator 2, a main gas-liquid separator 3, a solid-liquid gas-liquid separator 5, a high boiling point gas-liquid separator 6 and a steam heat exchange system 9, wherein a water outlet of the wastewater tank 1 is connected with a water inlet of the low boiling point separator 2 through a first pipeline, a water outlet of the low boiling point separator 2 is connected with a liquid inlet of the main gas-liquid separator 3 through a pipeline, a liquid outlet of the main gas-liquid separator 3 is connected with a liquid inlet of the solid-liquid gas-liquid separator 5 through a second pipeline, a liquid outlet of the solid-liquid gas-liquid separator 5 is respectively connected with the water inlet of the wastewater tank 1 and the liquid inlet of the high boiling point gas-liquid separator 6 through pipelines, a gas outlet of the low boiling point separator 2 is connected with a first condensing system 7, a gas outlet of the high boiling point gas-liquid separator 6 is connected with a second condensing system 8, and a gas outlet of, the main gas-liquid separator 3 is provided with an internal circulation loop for circulating the liquid therein, and the internal circulation loop, the first pipeline and the second pipeline are respectively connected to the steam heat exchange system and used for exchanging heat with the steam heat exchange system 9.
The working principle is as follows:
the wastewater entering the wastewater tank 1 exchanges heat with a steam heat exchange system 9, the temperature of the wastewater is raised by 60 ℃ after heat exchange, then the wastewater enters a low boiling point separator 2 in a negative pressure state, and substances with low boiling points, such as dichloromethane and the like, in the low boiling point separator 2 are separated into steam, a small amount of water vapor and air, and the steam, the water vapor and the air are condensed into liquid through a first condensing system 7 and collected and stored, and the condensed liquid is dichloromethane aqueous solution which can be recycled; meanwhile, the waste water at the middle lower part of the low boiling point separator 2 enters the main gas-liquid separator 3 through a pipeline, then exchanges heat with the steam heat exchange system 9 through the main gas-liquid separator 3 through a pipeline, the waste water after energy storage and temperature rise flows back to the interior of the main gas-liquid separator 3, the waste water after energy storage is instantaneously separated into two phases of vapor and liquid in the main gas-liquid separator 3, the vapor phase is treated by an in-device defoaming and liquid-removing device to become steam (which is conventionally called as secondary steam), enters the steam heat exchange system 9 through a connecting pipeline (before the secondary steam is pressurized and heated in advance to enable the pressure, the temperature and the saturation degree to reach the set parameters of the regenerated steam), is used as a heat exchange air source to completely replace the original raw steam to finish the heating with the wastewater in the main gas-liquid separator 3, the regenerated steam is also transformed into condensed water due to the heat exchange with the wastewater, and the quality of the condensed water meets the quality standards of domestic and industrial water (namely, distilled water); meanwhile, the liquid separated from the main gas-liquid separator 3 is distributed at the lower part of the main gas-liquid separator 3 and is output outwards through a pipeline, the concentrated solution exchanges heat with a steam heat exchange system 9 and then enters a solid-liquid gas-liquid separator 5, solid composite salt and mother liquor are separated from the solid-liquid gas-liquid separator 5, the composite salt can be recycled as industrial raw materials, the 2/3 amount of the mother liquor meets the waste water in the waste water tank 1 and enters an evaporation concentration cycle again, the other part of the mother liquor about 1/3 amount of the mother liquor enters a high boiling point gas-liquid separator 6, the mother liquor is separated into mixed steam of ethylene glycol and water and concentrated solution mainly containing salt in the high boiling point gas-liquid separator 6 after heat is supplemented, the concentrated solution is collected in the waste water tank 1 to participate in the evaporation concentration of the next round, the mixed steam enters a second condensation system 8 and is cooled into ethylene glycol aqueous solution condensed water for recycling, the whole system realizes low discharge of wastewater generated in the production of the vinyl sulfate and resource recycling; the operation energy consumption is low, the emission reduction and the resource recovery create benefits for enterprises, and the pollution of waste water to the environment is greatly reduced.
In a preferred embodiment, the steam heat exchange system 9 includes a first plate evaporator 91, a main condensed water tank 92, a first plate heat exchanger 93 and a second plate heat exchanger 94, a fluid inlet on a hot side of the first plate evaporator 91 constitutes a steam inlet, the steam inlet is externally connected to a steam source and a gas outlet of the main gas-liquid separator 3 through pipes, the fluid outlet on the hot side of the first plate evaporator 91 is connected to an inlet of the main condensed water tank 92 through a pipe, an outlet of the main condensed water tank 92 is connected to a fluid inlet on the hot side of the first plate heat exchanger 93 through a pipe, a fluid inlet and an outlet on a cold side of the first plate heat exchanger 93 are respectively communicated with the first pipe, a fluid inlet and an outlet on the cold side of the second plate heat exchanger 94 are respectively communicated with the first pipe, a fluid inlet and an outlet on the hot side of the second plate heat exchanger 94 are respectively communicated with the second pipe, the fluid inlet and outlet of the cold side of the first plate evaporator 91 are respectively communicated with the internal liquid of the main gas-liquid separator 3 through pipelines, and form the internal circulation loop, the whole steam heat exchange system 9 fully utilizes the steam heat energy generated by wastewater separation for heat exchange, the energy consumption is low, the raw steam input from the outside provides heat energy when the whole system is started, usually, the raw steam can be replaced by the regenerated steam made of the secondary steam recycled by the system within a few minutes after the system is started, the consumption of the raw steam is completed by a raw steam control component, and the operation process is as follows:
specifically, the wastewater entering the wastewater tank 1 passes through the cold side of the first plate heat exchanger 93 to exchange heat with the condensed water flowing through the hot side at the same time, the wastewater enters the cold side of the second plate heat exchanger 94 to exchange heat with the concentrated solution flowing through the hot side at the same time, the temperature of the wastewater is increased by 60 ℃, the wastewater enters the low boiling point separator 2 in a negative pressure state, the dichloromethane and the like which are substances with low boiling points in the low boiling point separator 2 are separated into steam, and the steam, the steam and the air are condensed into liquid through the first condensing system 7 and collected and stored, and the condensed liquid is dichloromethane aqueous solution which can be recycled; meanwhile, the waste water at the middle lower part of the low boiling point separator 2 enters the main gas-liquid separator 3 through a pipeline, then passes through the main gas-liquid separator 3 and the first plate evaporator 91 through a pipeline, the waste water after energy storage and temperature rise flows back to the interior of the main gas-liquid separator 3, the waste water after energy storage is instantaneously separated into two phases of gas and liquid in the main gas-liquid separator 3, the gas phase is treated by a defoaming and liquid removing device in the separator to form steam (which is conventionally called as secondary steam), then the secondary steam still passes through a pipeline and is output to the hot side of the first plate evaporator 91 (before the secondary steam can be pressurized and heated in advance to enable the pressure, the temperature and the saturation of the secondary steam to reach the set regeneration steam parameters), the original raw steam is completely replaced, the heating with the waste water in the main gas-liquid separator 3 is completed, and the regeneration steam is changed into condensed water due to the exchange cooling with the waste water through the first plate evaporator, the quality of the condensed water meets the standards of domestic and industrial water quality; meanwhile, the liquid separated in the main gas-liquid separator 3 is distributed at the lower part of the main gas-liquid separator 3, the concentrated solution is output outwards through a pipeline, exchanges heat with the cold-measured wastewater through the hot side of the first plate heat exchanger 93, then the wastewater enters a solid-liquid gas-liquid separator 5 to separate solid composite salt and mother liquor, the composite salt can be recycled as an industrial raw material, the 2/3-volume of the mother liquor meets the wastewater in the wastewater tank 1 and enters an evaporation concentration cycle again, the other part of 1/3-volume of the mother liquor enters a high-boiling point gas-liquid separator 6, after heat is supplemented, the mother liquor is separated into mixed steam of glycol and water and concentrated solution mainly containing salt in a high-boiling-point gas-liquid separator 6, the concentrated solution is collected in a waste water tank 1 to participate in the next round of evaporation and concentration, and the mixed steam is cooled into glycol aqueous solution condensed water after passing through a second condensation system 8 and is recycled.
As a preferable embodiment, a pipeline connecting the steam inlet and the gas outlet of the main gas-liquid separator 3 is provided with a water vapor compressor 95, and since the temperature and pressure of the secondary steam are lower than the value of the heat source steam required for heating the wastewater, and thus the secondary steam cannot be directly reused, the temperature and pressure of the secondary steam are raised to the level of the heat source steam by the steam compressor 95 driven by the electric power, so that the pressure, temperature and saturation of the secondary steam reach the set regeneration steam parameters, and then the secondary steam still enters the hot side of the first plate evaporator 91 through the pipeline to completely replace the original generation steam, thereby reducing the energy consumption and achieving the purpose of saving the cost and resources.
In a preferred embodiment, an automatic water replenishing device 96 is provided on a pipeline connecting the steam inlet and the gas outlet of the main gas-liquid separator 3, the automatic water replenishing device 9 is located upstream of the water-vapor compressor 95, and a control unit V2 is further provided at a connection between the automatic water replenishing device 9 and the pipeline.
In a preferred embodiment, the first condensing system 7 includes a first plate condenser 71, the gas outlet of the low boiling point separator 2 is sequentially connected to the fluid inlet and the fluid outlet of the hot side of the first plate condenser 71 through a pipeline, the fluid inlet and the fluid outlet of the cold side of the first plate condenser 71 are respectively and externally connected to a condensed water circulation system, and the condensed water circulation system is reasonable in design and relatively simple and convenient to operate, and the low boiling point substance dichloromethane and the like in the low boiling point separator 2 are separated into steam, and a small amount of water vapor and air enter the hot side of the first plate condenser 71 to be condensed into liquid by cooling water on the cold side, and then are recovered and reused.
Preferably, the first condensing system 7 further includes a balance tank 72, a fluid outlet at a hot side of the first plate-type condenser 71 is connected to the inside of the balance tank 72 through a pipeline, a vacuum pump 721 for extracting air inside the balance tank 72 is installed at a top of the balance tank 72, methylene dichloride and other substances with low boiling points in the low boiling point separator 2 are separated into steam and a small amount of steam, the air is condensed into liquid by cooling water at a cold side through entering the hot side of the first plate-type condenser 71, the condensed liquid and a small amount of non-condensable gas enter the balance tank 72 under the negative pressure of the vacuum pump 721, the non-condensable gas at an upper portion in the tank is pumped and exhausted by the vacuum pump 721, the condensed liquid at a lower portion of the tank is methylene dichloride aqueous solution, and the methylene dichloride aqueous solution can be recycled.
It should be noted that: the low boiling point substance in the waste water mainly contains dichloromethane, etc., the low boiling point steam formed in the system is similar to non-condensable gas, and the existence of the low boiling point steam can greatly reduce the efficiency of the evaporator until the evaporation is terminated, in the embodiment, the low boiling point separator 2, the plate type condenser, the balance tank 72 and the vacuum pump 721 (water ring vacuum pump) are adopted to effectively remove the non-condensable gas in the system, and the low boiling point dichloromethane, etc. are all recovered.
As a preferred embodiment, a crystal growing tank 51 for adjusting the thick liquid is communicated with a pipe section between the fluid outlet at the hot side of the second plate heat exchanger 94 and the solid-liquid-gas-liquid separator 5 on the second pipeline, in the actual treatment process, the concentrated solution exchanges heat with cold wastewater through the hot side of the first plate heat exchanger 93, then enters the crystal growing tank 51, is input into the solid-liquid-gas separator 5 after adjusting the thick crystal in the crystal growing tank 51, solid composite salt and mother liquor are separated, the composite salt can be recycled as industrial raw materials, and the wastewater in the wastewater tank 1, in which 2/3 amount of the mother liquor meets the requirement, enters the evaporation and concentration cycle again.
As a preferred embodiment, the second condensing system 8 includes a second plate condenser 81, the gas outlet of the high boiling point gas-liquid separator 6 is sequentially connected with the fluid inlet and outlet at the hot side of the second plate condenser 81 through a pipeline, during the production process, the mother liquor is separated into mixed steam of ethylene glycol and water and concentrated solution mainly containing salt in the high boiling point gas-liquid separator 6, the concentrated solution is collected in the wastewater tank 1 to participate in the next round of evaporation and concentration, and the mixed steam enters the hot side of the second plate condenser 81 for heat exchange, is cooled into ethylene glycol aqueous solution condensed water, and is recycled.
It should be noted that: the waste water contains 2-3% of glycol, and due to the fact that the boiling point of the glycol is high (about 180 ℃), the glycol is remained in the mother liquor and enriched, and desalting is affected finally.
In a preferred embodiment, an auxiliary heat exchange system 4 for supplementing heat energy to the fluid is connected to the pipeline between the liquid outlet of the solid-liquid gas-liquid separator 5 and the liquid inlet of the high-boiling point gas-liquid separator 6, and the purpose of the auxiliary heat exchange system 4 is to make another part of about 1/3 mother liquor undergo a heat exchange (energy storage process) before entering the high-boiling point gas-liquid separator 6, so that the temperature of the part of mother liquor can reach the condition for separation in the high-boiling point gas-liquid separator 6 (that is, the temperature is about 180 ℃).
As a preferred embodiment, the auxiliary heat exchange system 4 includes a second plate evaporator 41, a fluid inlet and a fluid outlet on the cold side of the second plate evaporator 41 are respectively connected to a pipeline between the fluid outlet of the solid-liquid gas-liquid separator 5 and the fluid inlet of the high-boiling point gas-liquid separator 6, the fluid inlet on the hot side of the second plate evaporator 41 is externally connected to a steam gas source, and another part of about 1/3 mother liquor exchanges heat with the hot side through the cold side of the second plate evaporator 41 before entering the high-boiling point gas-liquid separator 6, and completes the process of energy storage and temperature rise.
In this embodiment, pump sets (as shown in fig. 1, the pump sets M1, M2, M3, M4, and M5, arrows in the drawing indicate fluid flowing directions) are respectively disposed on the pipeline among the internal circulation loop, the condensed water main tank 92, and the first plate heat exchanger 93, the first pipeline, the second pipeline, and the liquid outlet of the solid-liquid-gas-liquid separator 5, so as to promote fluid flowing inside the whole system and smoothly complete the process of wastewater treatment.
In addition, control components (as shown in fig. 1, the control components are V1, V3, V4, V5, V6, and V7, arrows in the drawing indicate fluid flowing directions) can be arranged on the steam inlet, the internal circulation pipeline, the pipeline between the main condensed water tank 92 and the first plate heat exchanger 93, the pipeline connecting the low boiling point separator 2 with the first condensing system, and the pipeline where the hot-side steam inlet of the second plate evaporator 41 is located, so as to control and regulate the flow rate and the pressure of the fluid.
Throughout the examples, plate evaporators were used: in the application, the plate-type evaporator with the corresponding material characteristics is designed and selected through calculation software established by a mathematical model, and the plate-type evaporator has good internal coupling and characteristics, simultaneously carries out continuous phase change in the heat exchange process, and is stable and reliable in process and easy to operate; high heat transfer coefficient, low pressure drop, high self-cleaning action on the surface of heat exchange plate, no scaling and no blocking. The detachable structure is convenient to maintain. The flow mode of forced positive circulation, film lifting and countercurrent is adopted, so that high efficiency and low energy consumption are ensured, and particularly, the phenomenon of blockage is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a vinyl sulfate waste water treatment and recovery system which characterized in that: the system comprises a wastewater tank (1), a low boiling point separator (2), a main gas-liquid separator (3), a solid-liquid gas-liquid separator (5), a high boiling point gas-liquid separator (6) and a steam heat exchange system (9), wherein a water outlet of the wastewater tank (1) is connected with a water inlet of the low boiling point separator (2) through a first pipeline, a water outlet of the low boiling point separator (2) is connected with a liquid inlet of the main gas-liquid separator (3) through a pipeline, a liquid outlet of the main gas-liquid separator (3) is connected with a liquid inlet of the solid-liquid gas-liquid separator (5) through a second pipeline, a liquid outlet of the solid-liquid gas-liquid separator (5) is respectively connected with the water inlet of the wastewater tank (1) and the liquid inlet of the high boiling point gas-liquid separator (6) through pipelines, and a gas outlet of the low boiling point separator (2) is, the gas outlet of the high-boiling-point gas-liquid separator (6) is connected with a second condensing system (8), the gas outlet of the main gas-liquid separator (3) is connected with the steam inlet of the steam heat exchange system (9), the main gas-liquid separator (3) is provided with an internal circulation loop for internal liquid circulation, and the internal circulation loop, the first pipeline and the second pipeline are respectively connected into the steam heat exchange system and used for exchanging heat with the steam heat exchange system.
2. The vinyl sulfate production wastewater treatment and recovery system according to claim 1, wherein: the steam heat exchange system (9) comprises a first plate evaporator (91), a condensed water main tank (92), a first plate heat exchanger (93) and a second plate heat exchanger (94), wherein a steam inlet is formed by a fluid inlet at the hot side of the first plate evaporator (91), the steam inlet is respectively connected with a steam air source and a gas outlet of the main gas-liquid separator (3) through pipelines, a fluid outlet at the hot side of the first plate evaporator (91) is connected with an inlet of the condensed water main tank (92) through a pipeline, an outlet of the condensed water main tank (92) is connected with a fluid inlet at the hot side of the first plate heat exchanger (93) through a pipeline, a fluid inlet and a fluid outlet at the cold side of the first plate heat exchanger (93) are respectively communicated with the first pipeline, and a fluid inlet and a fluid outlet at the cold side of the second plate heat exchanger (94) are respectively communicated with the first pipeline, and a fluid inlet and a fluid outlet of the hot side of the second plate heat exchanger (94) are respectively communicated with the second pipeline, and a fluid inlet and a fluid outlet of the cold side of the first plate evaporator (91) are respectively communicated with the interior of the main gas-liquid separator (3) through pipelines and form the internal circulation loop.
3. The vinyl sulfate production wastewater treatment and recovery system according to claim 2, wherein: a steam compressor (95) is arranged on a pipeline of which the steam inlet is communicated with the gas outlet of the main gas-liquid separator (3).
4. The vinyl sulfate production wastewater treatment and recovery system according to claim 2, wherein: an automatic water replenishing device (96) is arranged on a pipeline communicated with the steam inlet and the gas outlet of the main gas-liquid separator (3).
5. The vinyl sulfate production wastewater treatment and recovery system according to claim 1, wherein: the first condensation system (7) comprises a first plate type condenser (71), a gas outlet of the low boiling point separator (2) is sequentially connected with a fluid inlet and a fluid outlet of a hot side of the first plate type condenser (71) through pipelines, and the fluid inlet and the fluid outlet of the cold side of the first plate type condenser (71) are respectively externally connected with a condensed water circulation system.
6. The vinyl sulfate production wastewater treatment and recovery system according to claim 5, wherein: the first condensation system (7) further comprises a balance tank (72), a fluid outlet at the hot side of the first plate type condenser (71) is connected with the interior of the balance tank (72) through a pipeline, and a vacuum pump (721) used for pumping the air in the balance tank (72) is installed at the top of the balance tank (72).
7. The vinyl sulfate production wastewater treatment and recovery system according to claim 1, wherein: and a crystal growing tank (51) for thickening liquid is communicated with a pipe section between the fluid outlet at the hot side of the second plate heat exchanger (94) and the solid-liquid-gas-liquid separator (5) on the second pipeline.
8. The vinyl sulfate production wastewater treatment and recovery system according to claim 1, wherein: the second condensing system (8) comprises a second plate-type condenser (81), and a gas outlet of the high-boiling-point gas-liquid separator (6) is connected with a fluid inlet and a fluid outlet of the hot side of the second plate-type condenser (81) sequentially through a pipeline.
9. The vinyl sulfate production wastewater treatment and recovery system according to any one of claims 1 to 8, wherein: and an auxiliary heat exchange system (4) for supplementing heat energy to the fluid is connected on a pipeline between the liquid outlet of the solid-liquid gas-liquid separator (5) and the liquid inlet of the high-boiling-point gas-liquid separator (6).
10. The vinyl sulfate production wastewater treatment and recovery system according to claim 9, wherein: the auxiliary heat exchange system (4) comprises a second plate-type evaporator (41), a fluid inlet and a fluid outlet on the cold side of the second plate-type evaporator (41) are respectively connected to a pipeline between a liquid outlet of the solid-liquid gas-liquid separator (5) and a liquid inlet of the high-boiling-point gas-liquid separator (6), and a fluid inlet on the hot side of the second plate-type evaporator (41) is externally connected with a steam air source.
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