CN212832923U - Multistage separation system for separating light oil from oily wastewater - Google Patents
Multistage separation system for separating light oil from oily wastewater Download PDFInfo
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- CN212832923U CN212832923U CN202021534506.8U CN202021534506U CN212832923U CN 212832923 U CN212832923 U CN 212832923U CN 202021534506 U CN202021534506 U CN 202021534506U CN 212832923 U CN212832923 U CN 212832923U
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Abstract
A multi-stage separation system for separating light oil from oily wastewater comprises a light oil removal distillation tower, wherein the light oil removal distillation tower is provided with a dehydrated waste oil inlet, the bottom in the light oil removal distillation tower is provided with a heating coil, the heating coil provides a heat source by a reboiler, the top of the light oil removal distillation tower is connected with the input end of a third condenser through a pipeline, the output end of the third condenser is connected with the top of a liquid separation tank through a pipeline, the upper part of the liquid separation tank is provided with a separation tank conveying pipeline, and the separation tank conveying pipeline is used for being connected with a separation tank; the bottom of the liquid separating tank is connected with the top of the light oil removing distillation tower through a pipeline, and a delivery pump and a switch valve are arranged on the pipeline between the liquid separating tank and the light oil removing distillation tower. The system dehydrates the oily wastewater, then effectively separates the light oil in the oily wastewater, and discharges the residual waste oil to the next process.
Description
Technical Field
The utility model belongs to the technical field of oily waste water recovery processing, in particular to multi-stage separation system for separating light oil from oily waste water.
Background
In the processing and manufacturing fields of chemical industry, machinery and the like, oily wastewater is common industrial wastewater, and the oily wastewater is directly discharged to pollute the environment, so that the oily wastewater needs to be recycled. The petrochemical oily sewage treatment system disclosed in the Chinese patent CN201721018234.4 provides a set of treatment system aiming at how to filter oil in water, and the system has the following defects:
the oil type in the oily wastewater is more than the oil type, the oily wastewater contains heavy oil and light oil, the prior art can not classify and recover the waste oil and can not separate the light oil; in addition, the oil-water separation cannot be performed well for wastewater having a relatively high oil concentration and wastewater having a relatively large number of oil species.
Disclosure of Invention
In view of the technical problem that the background art exists, the utility model provides a multistage separation system of separating light oil from oily waste water, with oily waste water dehydration back, then separated the light oil in the oily waste water effectively, deliver to next technology with remaining waste oil discharge.
In order to solve the technical problem, the utility model discloses following technical scheme has been taken and has been realized:
a multi-stage separation system for separating light oil from oily wastewater comprises a light oil removal distillation tower, wherein the light oil removal distillation tower is provided with a dehydrated waste oil inlet, the bottom in the light oil removal distillation tower is provided with a heating coil, the heating coil provides a heat source by a reboiler, the top of the light oil removal distillation tower is connected with the input end of a third condenser through a pipeline, the output end of the third condenser is connected with the top of a liquid separation tank through a pipeline, the upper part of the liquid separation tank is provided with a separation tank conveying pipeline, and the separation tank conveying pipeline is used for being connected with a separation tank; the bottom of the liquid separating tank is connected with the top of the light oil removing distillation tower through a pipeline, and a delivery pump and a switch valve are arranged on the pipeline between the liquid separating tank and the light oil removing distillation tower.
In a preferable scheme, the middle part of the light oil removal distillation tower is provided with a circulating oil supplementing port, and the circulating oil supplementing port is connected with the input end of a reboiler through a pipeline.
In a preferable scheme, the input end and the output end of the reboiler are connected in series with the heating coil through a circulating oil pipe to form a closed oil circuit, and a circulating oil pump is arranged on the circulating oil pipe at the output end of the reboiler.
In a preferable scheme, the middle part of the light oil removal distillation tower is provided with a light diesel oil discharge pipe, and the bottom of the light oil removal distillation tower is provided with a waste oil discharge pipe.
In a preferred scheme, a dehydrated waste oil inlet of the light oil removal distillation tower is connected with an oily wastewater dehydration system through a pipeline, the oily wastewater dehydration system comprises a heater for heating oily wastewater, an output end of the heater is connected with an input end of a flash evaporator through a pipeline, a top outlet of the flash evaporator is connected with an input end of a washing tank through a pipeline, and a top outlet of the washing tank is connected with a vacuumizing device through a pipeline; the washing tank is provided with a washing liquid inlet, the washing liquid inlet is connected with the output end of the first condenser through a pipeline, and the first condenser is used for reducing the temperature of the washing liquid; a liquid outlet is arranged at the bottom of the washing tank and is connected with the input end of the separation tank through a pipeline; the bottom of the flash evaporator is provided with a waste oil discharge port, and the waste oil discharge port of the flash evaporator is connected with a dehydrated waste oil inlet of the light oil removal distillation tower through a pipeline.
In the preferred scheme, the input end of the separation tank is positioned at the lower half part of the separation tank, the upper half part of the separation tank is provided with a light oil drain outlet, the middle part of the separation tank is provided with a buoy liquid level meter, and the buoy liquid level meter is used for measuring the liquid level of the washing liquid in the separation tank; the top of the separation tank is provided with a vent pipe; the bottom of the separating tank is provided with a liquid outlet.
In a preferable scheme, the washing liquid is circulating water, a circulating water outlet is formed in the bottom of the separation tank, and the circulating water outlet is connected with the input end of the first condenser through a pipeline.
In a preferable scheme, a second condenser is arranged on a pipeline between the vacuumizing device and the washing tank.
This patent can reach following beneficial effect:
the reboiler is used for providing the heat source for the light oil removal distillation tower, the light oil boiling point that contains in the waste oil is low, evaporates light oil through the light oil removal distillation tower, then through the condensation of third condenser, the light oil after the condensation gets into the knockout drum, and the oil in the knockout drum can form the layering according to the difference of density, and the oil that is located the upper portion gets into the knockout drum and handles, and the oil pump of knockout drum bottom sends the distillation in the light oil removal distillation tower. And the light diesel oil discharge pipe is used for pumping the upper layer oil of the light oil removal distillation tower to the salt dissolving heat exchanger for continuous temperature rise. And a waste oil discharge pipe at the bottom of the light oil removal distillation tower is used for continuously discharging waste oil to the next process. And part of the upper oil of the light oil removal distillation tower is supplemented with the circulating oil for use. The system can realize the separation of light oil, and has good separation effect.
Oily wastewater in the raw material tank is pumped to a heater through a booster pump, the heater raises the temperature of the oily wastewater, after the oily wastewater enters a flash evaporator, water in the oily wastewater is quickly vaporized under the action of negative pressure in the flash evaporator, and trace gasoline is mixed in water vapor; the water vapor meets the washing liquid in the washing tank, the water vapor is liquefied quickly, and the mixed liquid in the washing tank flows into the separation tank for oil-water separation. And discharging the dehydrated waste oil from the bottom of the flash evaporator. This technical scheme can carry out dehydration with the waste water that oil concentration is high, and the dehydration is more thorough.
Light oil on the upper portion of the circulating water is discharged from the light oil liquid outlet, the circulating water is pumped to the first condenser, the first condenser is used for cooling the circulating water, the circulating water is recycled, and water resources are saved. The circulating water not only can play a cooling role, but also provides a supporting medium for separating trace light oil.
Drawings
The invention will be further explained with reference to the following figures and examples:
FIG. 1 is a system structure diagram of the present invention;
FIG. 2 is a structural diagram of the oily wastewater dewatering system of the present invention;
fig. 3 is the schematic diagram of the structure of the separation tank of the present invention.
In the figure: the device comprises a heater 1, a flash evaporator 2, a washing tank 3, a first condenser 41, a second condenser 42, a third condenser 43, a separation tank 5, a buoy liquid level meter 7, a light oil removal distillation tower 8, a reboiler 9 and a liquid separation tank 10.
Detailed Description
A preferred scheme is as shown in fig. 1, a multistage separation system for separating light oil from oily wastewater comprises a light oil removal distillation tower 8, the light oil removal distillation tower 8 is provided with a dehydrated waste oil inlet, the bottom in the light oil removal distillation tower 8 is provided with a heating coil, the heating coil is provided with a heat source by a reboiler 9, the top of the light oil removal distillation tower 8 is connected with the input end of a third condenser 43 through a pipeline, the output end of the third condenser 43 is connected with the top of a liquid separation tank 10 through a pipeline, the upper part of the liquid separation tank 10 is provided with a separation tank conveying pipeline, and the separation tank conveying pipeline is used for connecting a separation tank 5; the bottom of the liquid separating tank 10 is connected with the top of the light oil removal distillation tower 8 through a pipeline, and a delivery pump and a switch valve are arranged on the pipeline between the liquid separating tank 10 and the light oil removal distillation tower 8.
The reboiler 9 is used for providing a heat source for the light oil removal distillation tower 8, the light oil contained in the waste oil has a low boiling point, the light oil is evaporated through the light oil removal distillation tower 8 and then condensed through the third condenser 43, the condensed light oil enters the liquid separation tank 10, the oil in the liquid separation tank 10 can be layered according to different densities, the oil on the upper part enters the separation tank 5 for treatment, and the oil at the bottom of the liquid separation tank 10 is pumped into the light oil removal distillation tower 8 for distillation.
Further, the middle part of the light oil removal distillation tower 8 is provided with a circulating oil supplementing port which is connected with the input end of the reboiler 9 through a pipeline. The circulating oil in the reboiler 9 is taken from the oil at the upper layer of the light oil removal distillation tower 8.
Furthermore, the input end and the output end of the reboiler 9 are connected in series with the heating coil through a circulating oil pipe to form a closed oil circuit, and a circulating oil pump is arranged on the circulating oil pipe at the output end of the reboiler 9. As shown in fig. 1, a normally closed switch valve is provided on a pipe between the circulating oil replenishing port and the input end of the reboiler 9, the circulating oil replenishing port is used for replenishing circulating oil, and the normally closed switch valve is closed between the circulating oil replenishing port and the input end of the reboiler 9 under the condition that the circulating oil is in a large amount. The circulating oil pump is connected in parallel with a maintenance valve.
Further, a light diesel oil discharge pipe is arranged in the middle of the light oil removal distillation tower 8, and a waste oil discharge pipe is arranged at the bottom of the light oil removal distillation tower 8. And the light diesel oil discharge pipe is used for pumping the upper layer oil of the light oil removal distillation tower 8 to the salt dissolving heat exchanger for continuous temperature rise. And a waste oil discharge pipe at the bottom of the light oil removal distillation tower 8 is used for continuously discharging waste oil to the next process.
Further, a dehydrated waste oil inlet of the light oil removal distillation tower 8 is connected with an oily wastewater dehydration system through a pipeline.
As shown in fig. 2 and 3, the oily wastewater dewatering system comprises a raw material tank, oily wastewater in the raw material tank is used for being pumped to a heater 1, the heater 1 is used for heating the oily wastewater, an output end of the heater 1 is connected with an input end of a flash evaporator 2 through a pipeline, a top outlet of the flash evaporator 2 is connected with an input end of a washing tank 3 through a pipeline, and a top outlet of the washing tank 3 is connected with a vacuumizing device through a pipeline; the washing tank 3 is provided with a washing liquid inlet, the washing liquid inlet is connected with the output end of a first condenser 41 through a pipeline, and the first condenser 41 is used for reducing the temperature of the washing liquid; the bottom of the washing tank 3 is provided with a liquid outlet which is connected with the input end of the separation tank 5 through a pipeline.
Oily wastewater in the raw material tank is pumped to a heater 1 through a pressure pump, the heater 1 raises the temperature of the oily wastewater to over 100 ℃, after the oily wastewater enters a flash evaporator 2, water in the oily wastewater is quickly vaporized under the action of negative pressure in the flash evaporator 2, and trace gasoline is mixed in water vapor; the water vapor meets the washing liquid in the washing tank 3, the water vapor is liquefied rapidly, and the mixed liquid in the washing tank 3 flows into the separation tank 5 for oil-water separation. The washing tank 3 can be arranged at a high position, and the separation tank 5 can be arranged at a lower position lower than the washing tank 3; an adjusting valve is arranged on a connecting pipeline between the washing tank 3 and the separating tank 5.
Furthermore, the input end of the separation tank 5 is positioned at the lower half part of the separation tank 5, the upper half part of the separation tank 5 is provided with a light oil drain, the middle part of the separation tank 5 is provided with a buoy liquid level meter 7, and the buoy liquid level meter 7 is used for measuring the liquid level of the washing liquid in the separation tank 5; the top of the separation tank 5 is provided with a vent pipe; the bottom of the separation tank 5 is provided with a liquid outlet. The washing liquid is circulating water, a circulating water outlet is formed in the bottom of the separation tank 5, and the circulating water outlet is connected with the input end of the first condenser 41 through a pipeline.
The light oil generally refers to a hydrocarbon mixture with a boiling point range of about 50-350 ℃, and because the boiling point of the light oil is low, a trace amount of light oil enters the washing tank 3 along with water vapor. The light oil in the separation tank 5 floats on the circulating water, the light oil on the upper part of the circulating water is discharged from a light oil liquid outlet, the circulating water is pumped to a first condenser 41, the first condenser 41 is used for cooling the circulating water, and the water resource is saved by recycling the circulating water.
Further, a second condenser 42 is provided on a pipe between the vacuum-pumping device and the washing tank 3. The second condenser 42 can prevent a small amount of water vapor and light oil gas from entering the vacuum-pumping device, and has the function of secondary cooling and condensation.
Further, a waste oil discharge port is arranged at the bottom of the flash evaporator 2. The bottom of the flash evaporator 2 is used for discharging dehydrated waste oil, and the dehydrated waste oil is used for next process treatment.
The lower part of the flash evaporator 2 is provided with a buoy liquid level meter which is used for measuring the liquid level of the waste oil. And a regulating valve and a blind plate are arranged on a pipeline between the heater 1 and the raw material tank. And a regulating valve and a blind plate are arranged on a connecting pipeline of a light oil drain outlet at the upper half part of the separation tank 5.
The working principle of the whole device is as follows:
oily wastewater in the raw material tank is pumped to a heater 1 through a pressure pump, the heater 1 raises the temperature of the oily wastewater to over 100 ℃, after the oily wastewater enters a flash evaporator 2, water in the oily wastewater is quickly vaporized under the action of negative pressure in the flash evaporator 2, and trace gasoline is mixed in water vapor; the water vapor meets the washing liquid in the washing tank 3, the water vapor is liquefied rapidly, and the mixed liquid in the washing tank 3 flows into the separation tank 5 for oil-water separation. The light oil on the upper part of the circulating water is discharged from the light oil liquid outlet, the circulating water is pumped to a first condenser 41, the first condenser 41 is used for cooling the circulating water, and the dehydrated waste oil is discharged from the bottom of the flash evaporator 2. The reboiler 9 is used for providing a heat source for the light oil removal distillation tower 8, the light oil contained in the waste oil has a low boiling point, the light oil is evaporated through the light oil removal distillation tower 8 and then condensed through the third condenser 43, the condensed light oil enters the liquid separation tank 10, the oil in the liquid separation tank 10 can be layered according to different densities, the oil on the upper part enters the separation tank 5 for treatment, and the oil at the bottom of the liquid separation tank 10 is pumped into the light oil removal distillation tower 8 for distillation.
Claims (8)
1. The utility model provides a multistage piece-rate system of separating light oil from oily waste water, includes lightness-oil removal distillation column (8), and lightness-oil removal distillation column (8) are equipped with dehydration waste oil entry, its characterized in that: a heating coil is arranged at the bottom in the light oil removal distillation tower (8), the heating coil provides a heat source through a reboiler (9), the top of the light oil removal distillation tower (8) is connected with the input end of a third condenser (43) through a pipeline, the output end of the third condenser (43) is connected with the top of a liquid separation tank (10) through a pipeline, a separation tank conveying pipeline is arranged at the upper part of the liquid separation tank (10), and the separation tank conveying pipeline is used for being connected with a separation tank (5); the bottom of the liquid separating tank (10) is connected with the top of the light oil removing distillation tower (8) through a pipeline, and a delivery pump and a switch valve are arranged on the pipeline between the liquid separating tank (10) and the light oil removing distillation tower (8).
2. The multi-stage separation system for separating light oil from oily wastewater according to claim 1, characterized in that: the middle part of the light oil removal distillation tower (8) is provided with a circulating oil supplementing port which is connected with the input end of a reboiler (9) through a pipeline.
3. The multi-stage separation system for separating light oil from oily wastewater according to claim 2, characterized in that: the input end and the output end of the reboiler (9) are connected in series with the heating coil through a circulating oil pipe to form a closed oil circuit, and a circulating oil pump is arranged on the circulating oil pipe at the output end of the reboiler (9).
4. The multi-stage separation system for separating light oil from oily wastewater according to claim 1, characterized in that: the middle part of the light oil removal distillation tower (8) is provided with a light diesel oil discharge pipe, and the bottom of the light oil removal distillation tower (8) is provided with a waste oil discharge pipe.
5. The multi-stage separation system for separating light oil from oily wastewater according to claim 1, characterized in that: a dehydrated waste oil inlet of the light oil removal distillation tower (8) is connected with an oily wastewater dehydration system through a pipeline, the oily wastewater dehydration system comprises a heater (1) for heating oily wastewater, an output end of the heater (1) is connected with an input end of a flash evaporator (2) through a pipeline, a top outlet of the flash evaporator (2) is connected with an input end of a washing tank (3) through a pipeline, and a top outlet of the washing tank (3) is connected with a vacuumizing device through a pipeline; the washing tank (3) is provided with a washing liquid inlet, the washing liquid inlet is connected with the output end of the first condenser (41) through a pipeline, and the first condenser (41) is used for reducing the temperature of the washing liquid; a liquid outlet is arranged at the bottom of the washing tank (3) and is connected with the input end of the separation tank (5) through a pipeline; the bottom of the flash evaporator (2) is provided with a waste oil discharge port, and the waste oil discharge port of the flash evaporator (2) is connected with a dehydrated waste oil inlet of the light oil removal distillation tower (8) through a pipeline.
6. The multi-stage separation system for separating light oil from oily wastewater according to claim 5, characterized in that: the input end of the separation tank (5) is positioned at the lower half part of the separation tank (5), the upper half part of the separation tank (5) is provided with a light oil drain, the middle part of the separation tank (5) is provided with a buoy liquid level meter (7), and the buoy liquid level meter (7) is used for measuring the liquid level of washing liquid in the separation tank (5); the top of the separating tank (5) is provided with a vent pipe; the bottom of the separating tank (5) is provided with a liquid outlet.
7. The multi-stage separation system for separating light oil from oily wastewater according to claim 6, characterized in that: the washing liquid is circulating water, a circulating water outlet is formed in the bottom of the separation tank (5), and the circulating water outlet is connected with the input end of the first condenser (41) through a pipeline.
8. The multi-stage separation system for separating light oil from oily wastewater according to claim 7, characterized in that: a second condenser (42) is arranged on a pipeline between the vacuumizing device and the washing tank (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021534506.8U CN212832923U (en) | 2020-07-29 | 2020-07-29 | Multistage separation system for separating light oil from oily wastewater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021534506.8U CN212832923U (en) | 2020-07-29 | 2020-07-29 | Multistage separation system for separating light oil from oily wastewater |
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| CN212832923U true CN212832923U (en) | 2021-03-30 |
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| CN202021534506.8U Active CN212832923U (en) | 2020-07-29 | 2020-07-29 | Multistage separation system for separating light oil from oily wastewater |
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