CN215288385U - Recovery system of waste water in crude chloroethylene rectification process - Google Patents
Recovery system of waste water in crude chloroethylene rectification process Download PDFInfo
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- CN215288385U CN215288385U CN202121047911.1U CN202121047911U CN215288385U CN 215288385 U CN215288385 U CN 215288385U CN 202121047911 U CN202121047911 U CN 202121047911U CN 215288385 U CN215288385 U CN 215288385U
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Abstract
The utility model discloses a recovery system of waste water in thick chloroethylene rectification process, it includes converter, demercuration ware, washing tower, alkaline washing tower, compressor, complete condenser, thick chloroethylene buffer tank, prefilter, coalescer, desicator, low boiling tower, drain tank, alkali lye pipeline and alkali circulation groove. The utility model has the advantages that: the utility model has simple connection structure and easy realization; the recycling of the waste water is realized, the workload of a waste water treatment system is reduced, the production cost of an enterprise is reduced, and the economic benefit of the enterprise is improved; the utility model discloses an automated control has guaranteed the discharge tank and has collected waste water and give the operation of the safety and stability of alkali circulation groove transport waste water.
Description
The technical field is as follows:
the utility model relates to a recovery system, in particular to recovery system of waste water in thick chloroethylene rectification process.
Background art:
the existing preparation method of vinyl chloride mainly adopts an acetylene method, wherein acetylene and hydrogen chloride react in a converter to generate crude vinyl chloride gas, the crude vinyl chloride gas enters a water washing tower and an alkaline washing tower in sequence after mercury is removed by a mercury remover to wash away hydrogen chloride and carbon dioxide in the gas, and an alkaline circulation tank conveys 15% of liquid alkali to the alkaline washing tower to remove the hydrogen chloride and the carbon dioxide again; the gas after alkali washing is stored in a crude chloroethylene buffer tank through liquid chloroethylene obtained through compression, full condensation and liquefaction, then the liquid chloroethylene in the crude chloroethylene buffer tank is filtered through a prefilter, a coalescer and a dryer are used for removing water, finally a high-boiling-point substance and a low-boiling-point substance are removed through a low-boiling tower and a high-boiling tower, the obtained refined chloroethylene is sent into a storage tank, the rectification process of the crude chloroethylene is completed, the crude chloroethylene buffer tank, the coalescer and the dryer need to be periodically drained in the rectification process, the drained water is alkaline water, and the drained water is directly sent to a wastewater treatment system for water treatment, so that the waste of alkaline water resources is caused, meanwhile, the treatment cost of a subsequent wastewater treatment system is increased, and the economic benefit of an enterprise is reduced.
The utility model has the following contents:
an object of the utility model is to provide a connection structure is simple, and has realized the recovery system of waste water among waste water recovery's the thick chloroethylene rectification process.
The utility model discloses by following technical scheme implement: the purpose of this patent provides a recovery system of waste water in thick chloroethylene rectification process, it includes converter, demercuration ware, washing tower, alkaline washing tower, compressor, complete condenser, thick chloroethylene buffer tank, prefilter, coalescer, desicator, low boiling tower, drain tank, alkali lye pipeline and alkali circulation tank; the gas outlet of the converter is communicated with the gas inlet of the mercury remover, the gas outlet of the mercury remover is communicated with the gas inlet of the water scrubber, and the gas outlet of the water scrubber is communicated with the gas inlet of the alkaline washing tower; an air outlet of the alkaline washing tower is communicated with an air inlet of the compressor, an air outlet of the compressor is communicated with an air inlet of the total condenser, an air outlet of the total condenser is communicated with an air inlet of the crude vinyl chloride buffer tank, an air outlet of the crude vinyl chloride buffer tank is communicated with an air inlet of the prefilter, an air outlet of the prefilter is communicated with an air inlet of the coalescer, an air outlet of the coalescer is communicated with an air inlet of the dryer, and an air inlet of the dryer is communicated with an air inlet of the low-boiling tower; the bottom water outlets of the crude chloroethylene buffer tank, the coalescer and the dryer are communicated with the water inlet of the drainage tank; the water outlet of the drainage tank and the liquid outlet end of the alkali liquor pipeline are both communicated with the liquid inlet of the alkali circulation tank; and a liquid outlet of the alkali circulation tank is communicated with a liquid inlet of the alkali washing tower.
Further, it comprises a first pressure sensor, a second pressure sensor and a controller; the first pressure sensor is arranged in the drainage tank, and the second pressure sensor is arranged in the alkali circulation tank; a first control valve is arranged on a pipeline between the crude chloroethylene buffer tank and the drainage tank; a second control valve is arranged on a pipeline between the coalescer and the drainage tank; a third control valve is provided on a pipe between the dryer and the drain tank; a solenoid valve is arranged on a pipeline between the drainage tank and the alkali circulation tank; the signal output ends of the first pressure sensor and the second pressure sensor are in signal connection with the signal input end of the controller; and the signal output end of the controller is respectively connected with the signal input ends of the first control valve, the second control valve, the third control valve and the electromagnetic valve through signals.
Further, the device also comprises a first liquid level sensor and a second liquid level sensor; a first liquid level sensor is arranged in a water collecting tank at the bottom of the crude chloroethylene buffer tank; a second liquid level sensor is disposed in the coalescer; and the signal output ends of the first liquid level sensor and the second liquid level sensor are in signal connection with the signal input end of the controller.
Further, an air outlet of the drainage tank is communicated with an air inlet of the air cabinet; an exhaust valve is arranged between the drainage tank and the gas holder; and the signal output end of the controller is in signal connection with the signal input end of the exhaust valve.
Further, a nitrogen pipeline is communicated with an air inlet of the drainage tank; an air inlet valve is arranged on a pipeline at an air inlet of the drainage tank; and the signal output end of the controller is in signal connection with the signal input end of the air inlet valve.
Further, an air outlet of the drainage tank is communicated with an air inlet of the gas-liquid separation tank; the gas outlet of the gas-liquid separation tank is communicated with the gas inlet of the water seal tank, and the gas outlet of the water seal tank is communicated with the gas inlet of the discharge cylinder; and an explosion-proof sheet and a safety valve are sequentially arranged on the exhaust port of the drainage tank.
The utility model has the advantages that: 1. the utility model has simple connection structure and easy realization; the alkaline wastewater in the crude chloroethylene buffer tank, the coalescer and the dryer is collected through the drainage tank and then is sent to the alkaline circulation tank as alkaline washing liquid for the alkaline washing tower, so that the wastewater is recycled, the workload of a wastewater treatment system is reduced, the production cost of an enterprise is reduced, and the economic benefit of the enterprise is improved; 2. the utility model discloses an automated control has guaranteed the discharge tank and has collected waste water and give the operation of the safety and stability of alkali circulation groove transport waste water.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of the overall connection structure of the system of the present invention.
Fig. 2 is a block diagram of the control system of the present invention.
The system comprises a converter 1, a mercury remover 2, a water scrubber 3, an alkaline tower 4, a compressor 5, a total condenser 6, a crude vinyl chloride buffer tank 7, a prefilter 8, a coalescer 9, a dryer 10, a low-boiling tower 11, a drain tank 12, an alkaline liquid pipeline 13, an alkaline circulation tank 14, a first pressure sensor 15, a second pressure sensor 16, a controller 17, a first liquid level sensor 18, a second liquid level sensor 19, a first control valve 20, a second control valve 21, a third control valve 22, an electromagnetic valve 23, a gas holder 24, an exhaust valve 25, a nitrogen pipeline 26, an air inlet valve 27, a gas-liquid separation tank 28, a water seal tank 29, a discharge cylinder 30, an explosion-proof sheet 31 and a safety valve 32.
The specific implementation mode is as follows:
as shown in fig. 1-2, a system for recovering waste water from a crude vinyl chloride rectification process comprises a converter 1, a mercury remover 2, a water washing tower 3, an alkaline washing tower 4, a compressor 5, a total condenser 6, a crude vinyl chloride buffer tank 7, a prefilter 8, a coalescer 9, a dryer 10, a low boiling tower 11, a drain tank 12, an alkaline line 13, an alkaline circulation tank 14, a first pressure sensor 15, a second pressure sensor 16, a controller 17, a first liquid level sensor 18 and a second liquid level sensor 19; the gas outlet of the converter 1 is communicated with the gas inlet of the mercury remover 2, the gas outlet of the mercury remover 2 is communicated with the gas inlet of the water scrubber 3, and the gas outlet of the water scrubber 3 is communicated with the gas inlet of the alkaline washing tower 4; an air outlet of the alkaline tower 4 is communicated with an air inlet of a compressor 5, an air outlet of the compressor 5 is communicated with an air inlet of a total condenser 6, an liquid outlet of the total condenser 6 is communicated with a liquid inlet of a crude chloroethylene buffer tank 7, a liquid outlet of the crude chloroethylene buffer tank 7 is communicated with a liquid inlet of a prefilter 8, a liquid outlet of the prefilter 8 is communicated with a liquid inlet of a coalescer 9, a liquid outlet of the coalescer 9 is communicated with a liquid inlet of a dryer 10, and a liquid inlet of the dryer 10 is communicated with a liquid inlet of a low-boiling tower 11; the water outlets at the bottoms of the crude chloroethylene buffer tank 7, the coalescer 9 and the dryer 10 are all communicated with the water inlet of the drainage tank 12; the water outlet of the water drainage tank 12 and the liquid outlet end of the alkali liquor pipeline 13 are both communicated with the liquid inlet of the alkali circulation tank 14; the liquid outlet of the alkali circulation tank 14 is communicated with the liquid inlet of the alkali washing tower 4.
A first pressure sensor 15 is provided in the drain tank 12, and a second pressure sensor 16 is provided in the alkali circulation tank 14; a first control valve 20 is arranged on a pipeline between the crude chloroethylene buffer tank 7 and the drainage tank 12; a second control valve 21 is provided on the pipe between the coalescer 9 and the drain tank 12; a third control valve 22 is provided on a pipe between the dryer 10 and the drain tank 12; an electromagnetic valve 23 is arranged on a pipeline between the drainage tank 12 and the alkali circulation tank 14; a first liquid level sensor 18 is arranged in a water collecting tank at the bottom of the crude chloroethylene buffer tank 7; a second liquid level sensor 19 is arranged in the coalescer 9; the air outlet of the drainage tank 12 is communicated with the air inlet of the air cabinet 24; an exhaust valve 25 is arranged between the drainage tank 12 and the gas holder 24; the nitrogen gas line 26 communicates with the gas inlet of the drain tank 12; an intake valve 27 is provided in the pipe at the air inlet of the drain tank 12.
An air outlet of the drain tank 12 is communicated with an air inlet of the gas-liquid separation tank 28; the gas outlet of the gas-liquid separation tank 28 is communicated with the gas inlet of the water seal tank 29, and the gas outlet of the water seal tank 29 is communicated with the gas inlet of the discharge cylinder 30; an explosion-proof plate 31 and a safety valve 32 are provided in this order at the exhaust port of the drain tank 12.
The signal output ends of the first pressure sensor 15, the second pressure sensor 16, the first liquid level sensor 18 and the second liquid level sensor 19 are connected with the signal input end of the controller 17 through signals; the signal output ends of the controller 17 are connected with the signal input ends of the first control valve 20, the second control valve 21, the third control valve 22, the electromagnetic valve 23, the exhaust valve 25 and the intake valve 27 through signals.
The working principle is as follows: a first liquid level sensor 18 in a water collecting tank at the bottom of the crude vinyl chloride buffer tank 7 and a second liquid level sensor 19 in the coalescer 9 monitor respective waste water levels at all times and transmit signals to the controller 17, when the detected liquid levels reach an upper limit value, the controller 17 controls respective first and second control valves 20 and 21 to be opened and waste water to be discharged into the drain tank 12, and when the detected liquid levels fall to a lower limit value, the controller 17 controls respective first and second control valves 20 and 21 to be closed; the controller 17 simultaneously and periodically controls the third control valve 22 to be opened, and the wastewater in the dryer 10 is discharged into the drain tank 12; the first pressure sensor 15 in the drainage tank 12 detects the pressure value in the drainage tank 12 at any time, and transmits a signal to the controller 17, when the detected pressure value reaches an upper limit value, the controller 17 controls the corresponding first control valve 20, second control valve 21 and third control valve 22 to close, and controls the exhaust valve 25 to open, vinyl chloride monomer in the drainage tank 12 is discharged into the gas holder 24 for temporary storage, when the detected pressure value is reduced to a set value, the controller 17 controls the exhaust valve 25 to close, the intake valve 27 to open, nitrogen is introduced into the drainage tank 12 for boosting, when the detected pressure value is increased to a set value, the controller 17 controls the intake valve 27 to close, the electromagnetic valve 23 to open, under the action of the pressure of the nitrogen, the wastewater in the drainage tank 12 is sent to the alkali circulation tank 14 as the alkali washing liquid for the alkali washing tower 4, thereby realizing the recycling of the wastewater, the workload of a wastewater treatment system is reduced, the production cost of an enterprise is reduced, and the economic benefit of the enterprise is improved; second pressure sensor 16 in the alkali circulation groove 14 detects the pressure value in the alkali circulation groove 14 constantly to on with signal transmission to controller 17, when the pressure value in the water drainage tank 12 that first pressure sensor 15 detected reached the lower limit value or the pressure value in the alkali circulation groove 14 that second pressure sensor 16 detected reached the upper limit value, controller 17 control solenoid valve 23 closed, stopped to carry the waste water in the water drainage tank 12 to the alkali circulation groove 14 in, the utility model discloses an automated control has guaranteed the safe and stable operation that water drainage tank 12 collected waste water and carried waste water for alkali circulation groove 14.
When the superpressure in the drainage tank 12, the explosion-proof piece 31 blasting of the gas vent department of drainage tank 12, the relief valve 32 take off the jump, and the gas in the drainage tank 12 passes through the pipeline and releases to the gas-liquid separation jar 28 in, carries out gas-liquid separation, and the gas after the separation discharges the atmosphere from discharging a section of thick bamboo 30 through water seal groove 29, has improved the security of system, has reduced on-the-spot staff's safety risk, the utility model discloses connection structure is simple, easily realizes.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A recovery system of waste water in the rectification process of crude chloroethylene is characterized by comprising a converter, a mercury remover, a water scrubber, an alkaline washing tower, a compressor, a full condenser, a crude chloroethylene buffer tank, a prefilter, a coalescer, a dryer, a low-boiling tower, a drainage tank, an alkali liquor pipeline and an alkali circulation tank;
the gas outlet of the converter is communicated with the gas inlet of the mercury remover, the gas outlet of the mercury remover is communicated with the gas inlet of the water scrubber, and the gas outlet of the water scrubber is communicated with the gas inlet of the alkaline washing tower; an air outlet of the alkaline washing tower is communicated with an air inlet of the compressor, an air outlet of the compressor is communicated with an air inlet of the total condenser, an air outlet of the total condenser is communicated with an air inlet of the crude vinyl chloride buffer tank, an air outlet of the crude vinyl chloride buffer tank is communicated with an air inlet of the prefilter, an air outlet of the prefilter is communicated with an air inlet of the coalescer, an air outlet of the coalescer is communicated with an air inlet of the dryer, and an air inlet of the dryer is communicated with an air inlet of the low-boiling tower;
the bottom water outlets of the crude chloroethylene buffer tank, the coalescer and the dryer are communicated with the water inlet of the drainage tank;
the water outlet of the drainage tank and the liquid outlet end of the alkali liquor pipeline are both communicated with the liquid inlet of the alkali circulation tank; and a liquid outlet of the alkali circulation tank is communicated with a liquid inlet of the alkali washing tower.
2. The system for recovering waste water from the rectification process of crude vinyl chloride as claimed in claim 1, which comprises a first pressure sensor, a second pressure sensor and a controller; the first pressure sensor is arranged in the drainage tank, and the second pressure sensor is arranged in the alkali circulation tank;
a first control valve is arranged on a pipeline between the crude chloroethylene buffer tank and the drainage tank; a second control valve is arranged on a pipeline between the coalescer and the drainage tank; a third control valve is provided on a pipe between the dryer and the drain tank; a solenoid valve is arranged on a pipeline between the drainage tank and the alkali circulation tank;
the signal output ends of the first pressure sensor and the second pressure sensor are in signal connection with the signal input end of the controller; and the signal output end of the controller is respectively connected with the signal input ends of the first control valve, the second control valve, the third control valve and the electromagnetic valve through signals.
3. The system for recovering waste water from the rectification process of crude vinyl chloride as claimed in claim 2, further comprising a first liquid level sensor and a second liquid level sensor; a first liquid level sensor is arranged in a water collecting tank at the bottom of the crude chloroethylene buffer tank; a second liquid level sensor is disposed in the coalescer; and the signal output ends of the first liquid level sensor and the second liquid level sensor are in signal connection with the signal input end of the controller.
4. The system for recovering waste water from the rectification process of crude vinyl chloride as claimed in claim 3, wherein the outlet of the water discharge tank is communicated with the inlet of the gas holder; an exhaust valve is arranged between the drainage tank and the gas holder; and the signal output end of the controller is in signal connection with the signal input end of the exhaust valve.
5. A system for recovering waste water from the rectification process of crude vinyl chloride as claimed in claim 4 wherein a nitrogen line is connected to the gas inlet of said water discharge tank; an air inlet valve is arranged on a pipeline at an air inlet of the drainage tank; and the signal output end of the controller is in signal connection with the signal input end of the air inlet valve.
6. A system for recovering waste water from the rectification process of crude vinyl chloride as claimed in any one of claims 1 to 5 wherein the gas outlet of said water discharge tank is connected to the gas inlet of said gas-liquid separation tank; the gas outlet of the gas-liquid separation tank is communicated with the gas inlet of the water seal tank, and the gas outlet of the water seal tank is communicated with the gas inlet of the discharge cylinder; and an explosion-proof sheet and a safety valve are sequentially arranged on the exhaust port of the drainage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121047911.1U CN215288385U (en) | 2021-05-14 | 2021-05-14 | Recovery system of waste water in crude chloroethylene rectification process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121047911.1U CN215288385U (en) | 2021-05-14 | 2021-05-14 | Recovery system of waste water in crude chloroethylene rectification process |
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| CN215288385U true CN215288385U (en) | 2021-12-24 |
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| CN202121047911.1U Active CN215288385U (en) | 2021-05-14 | 2021-05-14 | Recovery system of waste water in crude chloroethylene rectification process |
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