CN108558111B - System and method for treating thickened oil sewage - Google Patents
System and method for treating thickened oil sewage Download PDFInfo
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- CN108558111B CN108558111B CN201810710789.8A CN201810710789A CN108558111B CN 108558111 B CN108558111 B CN 108558111B CN 201810710789 A CN201810710789 A CN 201810710789A CN 108558111 B CN108558111 B CN 108558111B
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- 239000010865 sewage Substances 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 106
- 238000001704 evaporation Methods 0.000 claims abstract description 48
- 230000008020 evaporation Effects 0.000 claims abstract description 48
- 150000003839 salts Chemical class 0.000 claims abstract description 30
- 239000012535 impurity Substances 0.000 claims abstract description 16
- 239000002351 wastewater Substances 0.000 claims abstract description 12
- 238000000605 extraction Methods 0.000 claims abstract description 10
- 239000011552 falling film Substances 0.000 claims description 105
- 239000007788 liquid Substances 0.000 claims description 71
- 230000000694 effects Effects 0.000 claims description 51
- 238000000926 separation method Methods 0.000 claims description 14
- 239000012141 concentrate Substances 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 9
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000001728 nano-filtration Methods 0.000 claims description 3
- 238000000108 ultra-filtration Methods 0.000 claims description 3
- 235000019198 oils Nutrition 0.000 abstract description 68
- 238000011084 recovery Methods 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 235000019476 oil-water mixture Nutrition 0.000 abstract description 2
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 61
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/08—Thin film evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention relates to the technical field of energy-saving and environment-friendly treatment of wastewater, in particular to a thickened oil wastewater treatment system and method. Separating oil from the oil-water mixture extracted by the oil extraction device by an oil-water device, deeply pretreating thick oil sewage, removing impurities, and further recovering the oil in the sewage; the dilute phase sewage after the deep pretreatment enters a multi-effect evaporation and MVR evaporation device for evaporation concentration, and the secondary steam generated by evaporation is used as a heat source for system evaporation to be recycled by improving the enthalpy through a vapor compressor, so that more than 80% of energy is saved, and more than 90% of water is saved; the wet salt meets the industrial salt sales standard after being dried. The system not only recovers the oil in the thick oil wastewater and improves the resource recovery utilization rate, but also fully utilizes the latent heat of the secondary steam of the device, reduces the energy consumption, simultaneously realizes the recovery and utilization of water resources and saves water.
Description
Technical Field
The invention relates to the technical field of energy-saving and environment-friendly treatment of wastewater, in particular to a thickened oil wastewater treatment system and method.
Background
In the process of oil collection, a water-driven oil extraction mode is generally adopted, and thick oil sewage can be generated after the extracted oil passes through an oil-water separation device. The heavy oil sewage is sewage containing heavy crude oil, and has the characteristics of complex components, poor biodegradability, high salt content, high treatment difficulty and the like, and if the heavy oil sewage is directly discharged, the heavy oil sewage can seriously pollute the environment. Therefore, how to carry out high-efficiency, energy-saving and environment-friendly treatment on the thick oil sewage is very important to improve the oil recovery utilization rate and water resources.
The traditional thick oil sewage treatment method comprises the methods of catalytic oxidation, activated carbon adsorption, traditional evaporation and the like, and has certain effects, but has the advantages of high energy consumption, large water consumption and low resource recycling rate. The system not only recovers the oil in the thick oil wastewater and improves the resource recovery utilization rate, but also fully utilizes the latent heat of the secondary steam of the device, reduces the energy consumption, simultaneously realizes the recovery and utilization of water resources and saves water.
Disclosure of Invention
The invention aims to solve the technical problems that: in order to solve the problems of low oil recovery efficiency, high energy consumption and serious water resource waste in the existing thick oil sewage treatment technology, the system and the method for treating the thick oil sewage are provided.
The invention solves the technical problems by adopting the technical scheme that: a thick oil sewage treatment system, which is characterized in that: the system mainly comprises a deep pretreatment device, a multi-effect evaporation and MVR evaporation device and a salt drying device which are connected in sequence;
The deep pretreatment device comprises a sewage tank (1), a sewage pump (2), an impurity tank (3), an oil tank (4), a dilute phase pump (5), a coarse-stage filter (6) and a precise filter (7), wherein thick oil sewage is communicated with an inlet of the coarse-stage filter (6) from an outlet of the sewage tank (1) through the sewage pump (2), an outlet at the lower end of the coarse-stage filter (6) is communicated with an inlet at the upper end of the impurity tank (3), an outlet of the coarse-stage filter (6) is communicated with an inlet of the precise filter (7), and an outlet at the lower end of the precise filter (7) is communicated with an inlet at the upper end of the oil tank (4);
The multi-effect evaporation and MVR evaporation device comprises: the device comprises a plate type preheater (8), a condensate water tank (9), a vacuum pump (10), a condensate water pump (11), an effective falling film circulating pump (12), an effective falling film evaporator (13), a shell-and-tube preheater (14), an effective vapor-liquid separator (15), a first condensate water tank (16), a second effective falling film circulating pump (17), a second effective falling film evaporator (18), a second effective vapor-liquid separator (19), a vapor compressor (20), a second condensate water tank (21), a first forced evaporator (22), a forced circulating pump (23), a second forced evaporator (24) and a third vapor-liquid separator (25); an outlet of the precision filter (7) is communicated with a left end inlet of the plate type preheater (8) through a light phase pump (5), a right end outlet of the plate type preheater (8) is communicated with a lower end inlet of the shell-and-tube preheater (14), a lower end outlet of the shell-and-tube preheater (14) is communicated with a tube side inlet of the first effect falling film evaporator (13) through a first effect falling film circulating pump (12), a lower end tube side outlet of the first effect falling film evaporator (13) is communicated with a tube side inlet of the first effect falling film evaporator (13) through a first effect falling film circulating pump (12), a tube side outlet of the first effect falling film evaporator (13) is communicated with a first effect vapor-liquid separator (19) through a pipeline, a tube side outlet of the first effect falling film evaporator (13) is communicated with a tube side inlet of the second effect falling film evaporator (18) through a second effect falling film circulating pump (17), a lower end tube side outlet of the second effect falling film evaporator (18) is communicated with a tube side inlet of the second effect falling film evaporator (18) through a second effect falling film circulating pump (17), a tube side outlet of the second effect falling film evaporator (18) is communicated with a forced to a tube side outlet of the second effect falling film evaporator (18) through a second effect falling film evaporator (25) through a pipeline, a tube side outlet of the second effect falling film evaporator (18 is communicated with a third evaporator side outlet of the second effect falling film evaporator (18), the outlet at the lower end of the third vapor-liquid separator (25) is communicated with the inlet at the upper end of the second forced evaporator (24) through a pipeline, the outlet at the lower end of the second forced evaporator (24) is communicated with the inlet at the lower end of the first forced evaporator (22) through a forced circulation pump (23), and the outlet at the lower end of the third vapor-liquid separator (25) is communicated with the inlet of the solid-liquid separator (27) through a concentrate pump (26);
The shell side outlet of the first-effect falling film evaporator (13) and the shell side outlet of the first forced evaporator are communicated with the left end inlet of the shell-and-tube preheater (14), the upper end outlet of the first-effect vapor-liquid separator (15) and the upper end outlet of the first condensate water tank (16) are communicated with the shell side inlet of the second-effect falling film evaporator (18) through pipelines, the upper ends of the second-effect vapor-liquid separator (19) and the second condensate water tank (21) are communicated with the right end inlet of the vapor compressor (20), the left end outlet of the vapor compressor (20) is respectively communicated with the first forced evaporator (22) and the shell side inlet of the first forced evaporator (23), the left end outlet of the vapor compressor (20) is communicated with the shell side outlet of the first-effect falling film evaporator (13) through pipelines, and the shell side of the first-effect falling film evaporator (13) is provided with a raw vapor inlet;
The condensate water outlet of the first-effect falling film evaporator (13) is communicated with the upper end inlet of the first condensate water tank (16) through a pipeline, the outlets at the two sides of the first forced evaporator (22) and the second forced evaporator (24) are communicated with the upper end inlet of the first condensate water tank (16) through pipelines, the lower end outlet of the first condensate water tank (16) and the left side outlet of the second-effect falling film evaporator (18) are communicated with the left end inlet of the second condensate water tank (21), and the lower end outlet of the second condensate water tank (21) is communicated with the right end inlet of the plate-type preheater (8);
The salt drying device comprises a concentrate pump (26), a solid-liquid separator (27), a collector (28), a fan (31), a cyclone separator (32), a salt tank (33), a water pump (28) and a heater (30); the lower end outlet of the third vapor-liquid separator (25) is communicated with the left end inlet of the solid-liquid separator (27) through a concentrate pump (26), the right end outlet of the solid-liquid separator (27) is communicated with the left end inlet of the cyclone separator (32) through a fan (31), the lower end outlet of the solid-liquid separator (27) is communicated with the lower end inlet of the condensate tank (9) through a water pump (28), the lower end outlet of the collector (28) is communicated with the inlet of the heater (30), the right end outlet of the heater (30) is communicated with the left end inlet of the cyclone dryer (30), meanwhile, the heater (30) is communicated with the fan (31), and the lower end outlet of the cyclone dryer (30) is communicated with the salt tank (33) through a pipeline;
Further, the thick oil sewage treatment system is characterized in that the steam compressor (20) can be any one of a Roots blower, a centrifugal blower and a centrifugal compressor;
Further, the thick oil sewage treatment system is characterized in that the precise processor (7) can be any one of an ultrafiltration processor and a nanofiltration processor;
A thick oil sewage treatment method is characterized in that: the method comprises the following steps:
1) Deep pretreatment: the thick oil sewage in the sewage tank (1) enters a coarse-stage filter (6) through a sewage pump (2) to carry out coarse-stage treatment, impurities in the thick oil sewage are removed, the filtered impurities enter an impurity tank (3), a solution after coarse-stage treatment enters a precise filter (7) to filter out dilute-phase wastewater and oil, the dilute-phase sewage enters a plate type preheater (8) through a dilute-phase pump (5) to be preheated, and the oil is recovered into an oil tank (4);
2) Multi-effect evaporation and MVR evaporation: the dilute phase sewage obtained by advanced pretreatment is subjected to preheating treatment by a plate type preheater (8), the preheated dilute phase sewage enters a shell-and-tube type preheater (14) for further preheating, the dilute phase sewage subjected to twice preheating enters a first-effect falling film evaporator (13) for evaporation and concentration, secondary steam and primary concentrated solution are generated by evaporation, and steam condensate water generated during the process of heating the wastewater in the first-effect falling film evaporator (13) is discharged to a first condensate water tank (16); a part of secondary steam and primary concentrate generated in the primary evaporation falling film evaporator (13) enter a primary vapor-liquid separator (15), vapor-liquid separation is carried out in the primary vapor-liquid separator (15), and the separated primary concentrate returns into the primary evaporation falling film evaporator (13); the other part of the secondary steam and the primary concentrated solution enter a second falling film evaporator (18);
the primary concentrated solution entering the second-effect falling film evaporator (18) exchanges heat with the secondary steam from the first vapor-liquid separator (15) and the first condensate water tank (16), the secondary vapor and the secondary concentrated solution generated by evaporation and concentration are evaporated and concentrated again, a part of the secondary steam and the secondary concentrated solution generated by evaporation and concentration enter the second-effect vapor-liquid separator (19), the separated secondary concentrated solution returns into the second-effect falling film evaporator (18), the separated secondary steam enters the compressor to compress and improve the enthalpy, the other part of the secondary steam and the secondary concentrated solution enter the first forced evaporator (22) to carry out forced evaporation, and the condensed water generated by the second-effect falling film evaporator (18) enters the second condensate water tank (21) through a condensed water outlet at the lower end of the second-effect falling film evaporator (18);
The secondary concentrated solution entering the first forced evaporator (22) is evaporated and concentrated again, secondary steam and tertiary concentrated solution generated by evaporation enter a third steam-liquid separator (25) to be subjected to steam-liquid separation, the separated tertiary concentrated solution enters a second forced evaporator (24), the generated secondary steam and tertiary concentrated solution return to the first forced evaporator (22) through a forced circulation pump (23), and the concentrated solution enters a solid-liquid separator (27) through a concentrated solution pump (26) after the concentration of the concentrated solution is saturated;
3) Salt drying: the saturated concentrated solution enters a solid-liquid separator (27) for liquid-solid separation, the separated liquid enters a condensate water tank (9) through a water pump (28), the separated solid enters a collector (28), the collector (28) is dried with a heater (30) through a pipeline, the dried concentrated solution enters a cyclone separator (32) for gas-solid separation, and the separated salt enters a salt tank (33) and the separated gas is directly discharged;
Further, the thick oil sewage treatment method is characterized in that condensed water in the second condensed water tank (21) enters the plate-type preheater (8) through the condensed water pump (11) to serve as a heat source of the condensed water;
further, the thick oil sewage treatment method is characterized in that condensed water entering the plate-type preheater (8) is preheated and then enters the condensed water tank (9) to be reinjected into the oil extraction device for recycling;
The beneficial effects of the invention are as follows: the thick oil sewage treatment system and the thick oil sewage treatment method can deeply treat thick oil sewage generated by the oil extraction device, recover oil products through the treatment of the deep pretreatment device, and improve the oil extraction rate; the pretreated dilute-phase sewage is evaporated and concentrated by a multi-effect evaporation and MVR evaporation device, and the secondary steam generated by evaporation is used as a heat source for system evaporation to be recycled by improving the enthalpy through a vapor compressor, so that fresh steam is saved, the energy consumption for system operation is reduced, and the energy is saved by more than 80%; meanwhile, secondary steam of the system is condensed as a heat source to release latent heat to be condensed into condensed water, the condensed water is provided for the oil extraction device for recycling, and the evaporation system omits a secondary steam condenser and saves water by more than 90 percent; the evaporated and concentrated wet salt enters a salt drying device for drying, and the dried salt meets the industrial salt standard and can be sold as a byproduct, so that the resource recycling is realized. The system not only recovers the oil in the thick oil wastewater and improves the resource recovery utilization rate, but also fully utilizes the latent heat of the secondary steam of the device, reduces the energy consumption, simultaneously realizes the recovery and utilization of water resources and saves water.
Drawings
The invention is further described below with reference to the drawings and examples;
FIG. 1 is a block diagram of a thickened oil sewage treatment process of the present invention;
FIG. 2 is a diagram of the process and equipment for treating thick oil wastewater according to the present invention;
in the figure: 1. the system comprises a sewage tank, a sewage pump, a3, an impurity tank, a4, an oil tank, a5, a light phase pump, a6, a coarse filter, a7, a precision filter, a 8, a plate preheater, a 9, a condensate tank, a 10, a vacuum pump, a 11, a condensate pump, a 12, a one-effect falling film circulating pump, a 13, a one-effect falling film evaporator, a 14, a shell-and-tube preheater, a 15, a one-effect vapor-liquid separator, a 16, a first condensate tank, a 17, a two-effect falling film circulating pump, a 18, a two-effect falling film evaporator, a 19, a two-effect vapor-liquid separator, a20, a vapor compressor, a 21, a second condensate tank, a 22, a first forced evaporator, a 23, a forced circulating pump, a 24, a second forced evaporator, a 25, a third vapor-liquid separator, a 26, a concentrate pump, a 27, a solid-liquid separator, a 28, a water pump, a 29, a collector and a 30. 31. Fan 32, cyclone separator 33, salt tank.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings;
Referring to fig. 1, in a thick oil sewage treatment flow chart of the invention, an oil-water mixture generated by an oil extraction device is separated into oil and thick oil sewage through an oil-water separation device, the separated oil enters an oil tank, the thick oil sewage enters a deep pretreatment device for deep treatment, the treated and recovered oil enters the oil tank, a dilute phase enters a multi-effect evaporation and MVR evaporation device for evaporation and concentration, the generated secondary steam is used for improving the enthalpy through a steam compressor, and is used as a heat source of a steam device to recover latent heat, the self-sufficient energy of the system is realized, condensed water after steam condensation enters a water tank, the water tank enters the oil extraction device to recycle water resources, wet salt enters a salt drying device for drying treatment, salt generated after drying enters a salt tank, and the water enters a condensation water tank to recycle the water resources through the condensation water tank;
referring to fig. 2, a thick oil sewage treatment process and an equipment diagram are shown, thick oil sewage is communicated with an inlet of a coarse-stage filter (6) from an outlet of a sewage tank (1) through a sewage pump (2), a lower end outlet of the coarse-stage filter (6) is communicated with an inlet of an upper end of an impurity tank (3), an outlet of the coarse-stage filter (6) is communicated with an inlet of a precise filter (7), and a lower end outlet of the precise filter (7) is communicated with an inlet of an upper end of an oil tank (4);
An outlet of the precision filter (7) is communicated with a left end inlet of the plate type preheater (8) through a light phase pump (5), a right end outlet of the plate type preheater (8) is communicated with a lower end inlet of the shell-and-tube preheater (14), a lower end outlet of the shell-and-tube preheater (14) is communicated with a tube side inlet of the first effect falling film evaporator (13) through a first effect falling film circulating pump (12), a lower end tube side outlet of the first effect falling film evaporator (13) is communicated with a tube side inlet of the first effect falling film evaporator (13) through a first effect falling film circulating pump (12), a tube side outlet of the first effect falling film evaporator (13) is communicated with a first effect vapor-liquid separator (19) through a pipeline, a tube side outlet of the first effect falling film evaporator (13) is communicated with a tube side inlet of the second effect falling film evaporator (18) through a second effect falling film circulating pump (17), a lower end tube side outlet of the second effect falling film evaporator (18) is communicated with a tube side inlet of the second effect falling film evaporator (18) through a second effect falling film circulating pump (17), a tube side outlet of the second effect falling film evaporator (18) is communicated with a forced to a tube side outlet of the second effect falling film evaporator (18) through a second effect falling film evaporator (25) through a pipeline, a tube side outlet of the second effect falling film evaporator (18 is communicated with a third evaporator side outlet of the second effect falling film evaporator (18), the outlet at the lower end of the third vapor-liquid separator (25) is communicated with the inlet at the upper end of the second forced evaporator (24) through a pipeline, the outlet at the lower end of the second forced evaporator (24) is communicated with the inlet at the lower end of the first forced evaporator (22) through a forced circulation pump (23), and the outlet at the lower end of the third vapor-liquid separator (25) is communicated with the inlet of the solid-liquid separator (27) through a concentrate pump (26);
The shell side outlet of the first-effect falling film evaporator (13) and the shell side outlet of the first forced evaporator are communicated with the left end inlet of the shell-and-tube preheater (14), the upper end outlet of the first-effect vapor-liquid separator (15) and the upper end outlet of the first condensate water tank (16) are communicated with the shell side inlet of the second-effect falling film evaporator (18) through pipelines, the upper ends of the second-effect vapor-liquid separator (19) and the second condensate water tank (21) are communicated with the right end inlet of the vapor compressor (20), the left end outlet of the vapor compressor (20) is respectively communicated with the first forced evaporator (22) and the shell side inlet of the first forced evaporator (23), the left end outlet of the vapor compressor (20) is communicated with the shell side outlet of the first-effect falling film evaporator (13) through pipelines, and the shell side of the first-effect falling film evaporator (13) is provided with a raw vapor inlet;
The condensate water outlet of the first-effect falling film evaporator (13) is communicated with the upper end inlet of the first condensate water tank (16) through a pipeline, the outlets at the two sides of the first forced evaporator (22) and the second forced evaporator (24) are communicated with the upper end inlet of the first condensate water tank (16) through pipelines, the lower end outlet of the first condensate water tank (16) and the left side outlet of the second-effect falling film evaporator (18) are communicated with the left end inlet of the second condensate water tank (21), and the lower end outlet of the second condensate water tank (21) is communicated with the right end inlet of the plate-type preheater (8);
The outlet at the lower end of the third vapor-liquid separator (25) is communicated with the inlet at the left end of the solid-liquid separator (27) through a concentrate pump (26), the outlet at the right end of the solid-liquid separator (27) is communicated with the inlet at the left end of the cyclone separator (32) through a fan (31), the outlet at the lower end of the solid-liquid separator (27) is communicated with the inlet at the lower end of the condensate water tank (9) through a water pump (28), the outlet at the lower end of the collector (28) is communicated with the inlet at the lower end of the heater (30), the outlet at the right end of the heater (30) is communicated with the inlet at the left end of the cyclone dryer (30), meanwhile, the heater (30) is communicated with the fan (31), and the outlet at the lower end of the cyclone dryer (30) is communicated with the salt tank (33) through a pipeline;
The vapor compressor (20) may be any one of a Roots blower, a centrifugal blower, and a centrifugal compressor;
The precision processor (7) can be any one of an ultrafiltration processor and a nanofiltration processor;
A thick oil sewage treatment method comprises the following steps:
1) Deep pretreatment: the thick oil sewage in the sewage tank (1) enters a coarse-stage filter (6) through a sewage pump (2) to carry out coarse-stage treatment, impurities in the thick oil sewage are removed, the filtered impurities enter an impurity tank (3), a solution after coarse-stage treatment enters a precise filter (7) to filter out dilute-phase wastewater and oil, the dilute-phase sewage enters a plate type preheater (8) through a dilute-phase pump (5) to be preheated, and the oil is recovered into an oil tank (4);
2) Multi-effect evaporation and MVR evaporation: the dilute phase sewage obtained by advanced pretreatment is subjected to preheating treatment by a plate type preheater (8), the preheated dilute phase sewage enters a shell-and-tube type preheater (14) for further preheating, the dilute phase sewage subjected to twice preheating enters a first-effect falling film evaporator (13) for evaporation and concentration, secondary steam and primary concentrated solution are generated by evaporation, and steam condensate water generated during the process of heating the wastewater in the first-effect falling film evaporator (13) is discharged to a first condensate water tank (16); a part of secondary steam and primary concentrate generated in the primary evaporation falling film evaporator (13) enter a primary vapor-liquid separator (15), vapor-liquid separation is carried out in the primary vapor-liquid separator (15), and the separated primary concentrate returns into the primary evaporation falling film evaporator (13); the other part of the secondary steam and the primary concentrated solution enter a second falling film evaporator (18);
the primary concentrated solution entering the second-effect falling film evaporator (18) exchanges heat with the secondary steam from the first vapor-liquid separator (15) and the first condensate water tank (16), the secondary vapor and the secondary concentrated solution generated by evaporation and concentration are evaporated and concentrated again, a part of the secondary steam and the secondary concentrated solution generated by evaporation and concentration enter the second-effect vapor-liquid separator (19), the separated secondary concentrated solution returns into the second-effect falling film evaporator (18), the separated secondary steam enters the compressor to compress and improve the enthalpy, the other part of the secondary steam and the secondary concentrated solution enter the first forced evaporator (22) to carry out forced evaporation, and the condensed water generated by the second-effect falling film evaporator (18) enters the second condensate water tank (21) through a condensed water outlet at the lower end of the second-effect falling film evaporator (18);
The secondary concentrated solution entering the first forced evaporator (22) is evaporated and concentrated again, secondary steam and tertiary concentrated solution generated by evaporation enter a third steam-liquid separator (25) to be subjected to steam-liquid separation, the separated tertiary concentrated solution enters a second forced evaporator (24), the generated secondary steam and tertiary concentrated solution return to the first forced evaporator (22) through a forced circulation pump (23), and the concentrated solution enters a solid-liquid separator (27) through a concentrated solution pump (26) after the concentration of the concentrated solution is saturated;
3) Salt drying: the saturated concentrated solution enters a solid-liquid separator (27) for liquid-solid separation, the separated liquid enters a condensate water tank (9) through a water pump (28), the separated solid enters a collector (28), the collector (28) is dried with a heater (30) through a pipeline, the dried concentrated solution enters a cyclone separator (32) for gas-solid separation, and the separated salt enters a salt tank (33) and the separated gas is directly discharged;
The condensed water in the second condensed water tank (21) enters the plate-type preheater (8) through the condensed water pump (11) to serve as a heat source of the plate-type preheater;
after the heat of the condensed water in the plate-type preheater (8) is recovered, the recovered heat enters the condensed water tank (9) to be recycled for the oil extraction device, and water resources are saved.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (4)
1. A thick oil sewage treatment system, which is characterized in that: the system mainly comprises a deep pretreatment device, a multi-effect evaporation and MVR evaporation device and a salt drying device which are connected in sequence;
The deep pretreatment device comprises a sewage tank (1), a sewage pump (2), an impurity tank (3), an oil tank (4), a dilute phase pump (5), a coarse-stage filter (6) and a precise filter (7), wherein thick oil sewage is communicated with an inlet of the coarse-stage filter (6) from an outlet of the sewage tank (1) through the sewage pump (2), an outlet at the lower end of the coarse-stage filter (6) is communicated with an inlet at the upper end of the impurity tank (3), an outlet of the coarse-stage filter (6) is communicated with an inlet of the precise filter (7), and an outlet at the lower end of the precise filter (7) is communicated with an inlet at the upper end of the oil tank (4);
The multi-effect evaporation and MVR evaporation device comprises: the device comprises a plate type preheater (8), a condensate water tank (9), a vacuum pump (10), a condensate water pump (11), an effective falling film circulating pump (12), an effective falling film evaporator (13), a shell-and-tube preheater (14), an effective vapor-liquid separator (15), a first condensate water tank (16), a second effective falling film circulating pump (17), a second effective falling film evaporator (18), a second effective vapor-liquid separator (19), a vapor compressor (20), a second condensate water tank (21), a first forced evaporator (22), a forced circulating pump (23), a second forced evaporator (24) and a third vapor-liquid separator (25); an outlet of the precision filter (7) is communicated with a left end inlet of the plate type preheater (8) through a light phase pump (5), a right end outlet of the plate type preheater (8) is communicated with a lower end inlet of the shell-and-tube preheater (14), a lower end outlet of the shell-and-tube preheater (14) is communicated with a tube side inlet of the first effect falling film evaporator (13) through a first effect falling film circulating pump (12), a lower end tube side outlet of the first effect falling film evaporator (13) is communicated with a tube side inlet of the first effect falling film evaporator (13) through a first effect falling film circulating pump (12), a tube side outlet of the first effect falling film evaporator (13) is communicated with a tube side inlet of the second effect falling film evaporator (18) through a second effect falling film circulating pump (17), a tube side outlet of the second effect falling film evaporator (18) is communicated with a forced to a tube side inlet of the second effect falling film evaporator (18) through a second effect falling film evaporator (19), a tube side outlet of the first effect falling film evaporator (19 is communicated with a forced to a tube side outlet of the second effect falling film evaporator (18) through a tube side inlet of the second effect falling film evaporator (18), the outlet at the lower end of the third vapor-liquid separator (25) is communicated with the inlet at the upper end of the second forced evaporator (24) through a pipeline, the outlet at the lower end of the second forced evaporator (24) is communicated with the inlet at the lower end of the first forced evaporator (22) through a forced circulation pump (23), and the outlet at the lower end of the third vapor-liquid separator (25) is communicated with the inlet of the solid-liquid separator (27) through a concentrate pump (26);
The shell side outlet of the first-effect falling film evaporator (13) and the shell side outlet of the first forced evaporator (22) are communicated with the right end inlet of the shell-and-tube preheater (14), the upper end outlet of the first-effect vapor-liquid separator (15) and the upper end outlet of the first condensate water tank (16) are communicated with the shell side inlet of the second-effect falling film evaporator (18) through pipelines, the upper end outlets of the second-effect vapor-liquid separator (19) and the second condensate water tank (21) are communicated with the left end inlet of the vapor compressor (20), and the right end outlet of the vapor compressor (20) is respectively communicated with the shell side inlets of the first forced evaporator (22) and the second forced evaporator (24); the outlet at the right end of the vapor compressor (20) is communicated with the shell side inlet of the one-effect falling film evaporator (13) through a pipeline, and the shell side of the one-effect falling film evaporator (13) is provided with a raw vapor inlet;
The condensate water outlet of the first-effect falling film evaporator (13) is communicated with the upper end inlet of the first condensate water tank (16) through a pipeline, the outlets at the two sides of the first forced evaporator (22) and the second forced evaporator (24) are communicated with the upper end inlet of the first condensate water tank (16) through pipelines, the lower end outlet of the first condensate water tank (16) and the left side outlet of the second-effect falling film evaporator (18) are communicated with the left end inlet of the second condensate water tank (21), and the lower end outlet of the second condensate water tank (21) is communicated with the right end inlet of the plate-type preheater (8);
The salt drying device comprises a concentrate pump (26), a solid-liquid separator (27), a water pump (28), a collector (29), a heater (30), a fan (31), a cyclone separator (32) and a salt tank (33); the outlet at the lower end of the third vapor-liquid separator (25) is connected with the inlet at the left end of a solid-liquid separator (27) through a concentrate pump (26), the outlet at the right end of the solid-liquid separator (27) is connected with a collector (29), and the outlet at the lower end of the solid-liquid separator (27) is connected with the inlet at the lower end of a condensate water tank (9) through a water pump (28); an outlet at one end of the collector (29) is connected with an inlet at the left end of the cyclone separator (32), an outlet at the other end of the collector is connected with the heater (30), the heater (30) is connected with the fan (31), and an outlet at the lower end of the cyclone separator (32) is connected with the salt tank (33) through a pipeline;
The steam compressor (20) is any one of a Roots blower, a centrifugal blower and a centrifugal compressor;
The precision filter (7) is any one of an ultrafiltration filter and a nanofiltration filter.
2. A thick oil sewage treatment method is characterized in that: the method comprises the following steps:
1) Deep pretreatment: the thick oil sewage in the sewage tank (1) enters a coarse-stage filter (6) through a sewage pump (2) to carry out coarse-stage treatment, impurities in the thick oil sewage are removed, the filtered impurities enter an impurity tank (3), a solution after coarse-stage treatment enters a precise filter (7) to filter out dilute-phase wastewater and oil, the dilute-phase sewage enters a plate type preheater (8) through a dilute-phase pump (5) to be preheated, and the oil is recovered into an oil tank (4);
2) Multi-effect evaporation and MVR evaporation: the dilute phase sewage obtained by advanced pretreatment is subjected to preheating treatment by a plate type preheater (8), the preheated dilute phase sewage enters a shell-and-tube type preheater (14) for further preheating, the dilute phase sewage subjected to twice preheating enters a first-effect falling film evaporator (13) for evaporation and concentration, secondary steam and primary concentrated solution are generated by evaporation, and steam condensate water generated during the process of heating the wastewater in the first-effect falling film evaporator (13) is discharged to a first condensate water tank (16); a part of secondary steam and primary concentrated solution generated in the primary falling film evaporator (13) enter a primary steam-liquid separator (15), steam-liquid separation is carried out in the primary steam-liquid separator (15), and the separated primary concentrated solution returns into the primary falling film evaporator (13); the other part of the secondary steam and the primary concentrated solution enter a two-effect falling film evaporator (18);
The primary concentrated solution entering the second-effect falling film evaporator (18) exchanges heat with the secondary steam from the first-effect vapor-liquid separator (15) and the first condensate water tank (16), the secondary steam and the secondary concentrated solution generated by evaporation and concentration enter the second-effect vapor-liquid separator (19), the separated secondary concentrated solution returns to the second-effect falling film evaporator (18), the separated secondary steam enters the compressor to compress and improve the enthalpy, the other part of the secondary steam and the secondary concentrated solution enter the first forced evaporator (22) to be forced evaporated, and the condensate water generated by the second-effect falling film evaporator (18) enters the second condensate water tank (21) through a condensate water outlet at the lower end of the second-effect falling film evaporator (18);
The secondary concentrated solution entering the first forced evaporator (22) is evaporated and concentrated again, secondary steam and tertiary concentrated solution generated by evaporation enter a third steam-liquid separator (25) to be subjected to steam-liquid separation, the separated tertiary concentrated solution enters a second forced evaporator (24), the generated secondary steam and tertiary concentrated solution return to the first forced evaporator (22) through a forced circulation pump (23), and the concentrated solution enters a solid-liquid separator (27) through a concentrated solution pump (26) after the concentration of the concentrated solution is saturated;
3) Salt drying: the saturated concentrated solution enters a solid-liquid separator (27) for liquid-solid separation, the separated liquid enters a condensate water tank (9) through a water pump (28), the separated solid enters a collector (29), the collector (29) is dried through a pipeline and a heater (30), the dried concentrated solution enters a cyclone separator (32) for gas-solid separation, and the separated salt enters a salt tank (33) and the separated gas is directly discharged.
3. The thick oil sewage treatment method according to claim 2, characterized in that condensed water in the second condensed water tank (21) enters the plate-type preheater (8) as a heat source thereof through the condensed water pump (11).
4. The thick oil sewage treatment method according to claim 2, wherein the thick oil sewage treatment method is characterized in that condensed water entering the plate-type preheater (8) is preheated and then enters the condensed water tank (9) to be reinjected into the oil extraction device for recycling.
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| CN109809618A (en) * | 2019-04-01 | 2019-05-28 | 安洁行方流体管理技术有限公司 | A kind of machinery industry oily waste liquor treatment process |
| CN110217934A (en) * | 2019-07-22 | 2019-09-10 | 四川省川南酿造有限公司 | A kind of preparation method of pickled vegetable brine MVR evaporative crystallization |
| CN110630235B (en) * | 2019-09-26 | 2020-12-22 | 温州通昌机械有限公司 | Injection-production integrated crude oil exploitation device |
| CN110981047B (en) * | 2019-11-08 | 2022-04-29 | 东莞道汇环保科技股份有限公司 | Treatment process of oily sewage of ship |
| CN112110586A (en) * | 2020-08-26 | 2020-12-22 | 广州市心德实业有限公司 | Complete equipment for sewage treatment, evaporation, crystallization, recycling and reutilization |
| CN112090099A (en) * | 2020-09-29 | 2020-12-18 | 南京塔川化工设备有限公司 | MVR and multi-effect evaporation combined system and solution concentration method adopting MVR and multi-effect evaporation combined system |
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