CN218231929U - Waste water strip processing system - Google Patents

Abstract

The utility model discloses a waste water stripping treatment system, which comprises a drainage collection tank; the drainage collection tank is communicated with a feeding pipe and an exhaust pipe, and the outer wall of the drainage collection tank is wound with a steam tracing pipe; the export of drainage collection tank passes through the import intercommunication of pipeline and waste water tank, and the top intercommunication of strip tower has the condenser, the gas outlet of condenser and the import intercommunication of vacuum pump, the export of vacuum pump and vapour and liquid separator's import intercommunication, and vapour and liquid separator's gas outlet intercommunication has the waste gas collection pipeline. The advantages are that: under the action of steam in the steam heat tracing pipe, part of chloroethylene in the drainage collection tank is recovered to a gas cabinet from an exhaust pipe in a gas state, so that the recovery of part of chloroethylene is realized; and (3) carrying out steam stripping treatment on the fed wastewater containing the vinyl chloride by using a stripping tower, feeding vinyl chloride gas and part of steam into a gas-liquid separator through a condenser, discharging separated vinyl chloride into a gas holder from the top of the gas-liquid separator through a waste gas collecting pipeline, and recycling the separated vinyl chloride.

Description

Waste water strip processing system

The technical field is as follows:

the utility model relates to a polyvinyl chloride production technical field, in particular to waste water steam stripping processing system.

The background art comprises the following steps:

in the production process of polyvinyl chloride, according to the distinction of field devices, 3 parts of discharged water containing vinyl chloride monomers are respectively discharged and discharged in the first and second polymerization stages, discharged and discharged by a feeding coating kettle, condensed liquid of a condenser at the top of a stripping tower and discharged by a monomer recovery middle tank, and the discharged water is not uniformly recovered at present but is discharged to a sewage pipe network on the spot; not only causes a large amount of water resource waste, but also causes resource waste because the discharged water contains 30 to 50 percent of chloroethylene; and the following problems still exist in the operation and discharge process, namely, each drainage point containing the vinyl chloride monomer needs manual field operation every hour, and in the discharge process, the drainage is needed to be observed to have achromaticity change and material carrying, the field close-range detection of operators is needed, the direct contact between human bodies and vinyl chloride cannot be avoided, so that the working strength of the operators is high, and a series of potential safety hazards are caused.

The utility model has the following contents:

an object of the utility model is to provide a carry out the effective waste water steam stripping processing system who retrieves to production drainage and interior chloroethylene.

The utility model discloses by following technical scheme implement: a waste water stripping treatment system comprises a drainage collection tank, a waste water tank, a first heat exchanger, a stripping tower, a vacuum pump and a gas-liquid separator; the drainage collection tank is communicated with a feeding pipe and an exhaust pipe, and the outer wall of the drainage collection tank is wound with a steam tracing pipe; an outlet of the drainage collection tank is communicated with an inlet of the waste water tank through a pipeline, an outlet of the waste water tank is communicated with a first inlet of the first heat exchanger through a pump, a first outlet of the first heat exchanger is communicated with an inlet of the stripping tower, a waste water outlet at the bottom of the stripping tower is communicated with a second inlet of the first heat exchanger, a second outlet of the first heat exchanger is communicated with a waste water recovery pipeline, and the bottom of the stripping tower is communicated with a steam pipeline; the top intercommunication of stripper has the condenser, the gas outlet of condenser with the import of vacuum pump communicates, the export of vacuum pump with the import of vapour and liquid separator communicates, the gas outlet intercommunication of vapour and liquid separator has the waste gas collection pipeline.

The condenser is characterized by further comprising a second heat exchanger and a delivery pump, wherein an inlet of the delivery pump is communicated with a liquid outlet of the gas-liquid separator, an outlet of the delivery pump is communicated with a first inlet of the second heat exchanger, a first outlet of the second heat exchanger is communicated with a liquid inlet of the condenser, a gas outlet of the condenser is communicated with a second inlet of the second heat exchanger, and a second outlet of the second heat exchanger is communicated with an inlet of the vacuum pump.

The utility model has the advantages that: under the action of steam in the steam heat tracing pipe, part of chloroethylene in the drainage collection tank is recovered to a gas cabinet from an exhaust pipe in a gas state, so that the recovery of part of chloroethylene is realized; carrying out steam stripping treatment on the fed wastewater containing the vinyl chloride by a steam stripping tower to remove the vinyl chloride in the wastewater, feeding vinyl chloride gas and part of steam into a gas-liquid separator through a condenser under the action of a vacuum pump, and discharging the separated vinyl chloride from the top of the gas-liquid separator into a gas cabinet through a waste gas collecting pipeline for recycling; the temperature of the wastewater in the stripping tower is still high, so that the wastewater is subjected to heat exchange with the wastewater discharged from the wastewater tank through the first heat exchanger, and the wastewater is sent to the mother liquor water biochemical device from the wastewater recovery pipeline after heat exchange for recycling, so that the waste of water resources is effectively avoided, and the reduction of the production water consumption of a workshop is facilitated; from this, through the utility model discloses can carry out effective processing to the free drainage that contains vinyl in the polyvinyl chloride production process, effectively avoid the potential safety hazard of manual operation direct discharge process.

Description of the drawings:

fig. 1 is a schematic structural diagram of the present invention.

The parts in the drawings are numbered as follows: the system comprises a drainage collection tank 1, a waste water tank 2, a first heat exchanger 3, a stripping tower 4, a vacuum pump 5, a gas-liquid separator 6, a feeding pipe 7, an exhaust pipe 8, a steam tracing pipe 9, a waste water recovery pipeline 10, a steam pipeline 11, a condenser 12, a waste gas collection pipeline 13, a second heat exchanger 14 and a delivery pump 15.

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, the present embodiment provides a wastewater stripping treatment system, which includes a drain collection tank 1, a wastewater tank 2, a first heat exchanger 3, a stripping tower 4, a vacuum pump 5, and a gas-liquid separator 6.

A feeding pipe 7 and an exhaust pipe 8 are communicated with the drainage collection tank 1, and a steam tracing pipe 9 is wound on the outer wall of the drainage collection tank 1; the drainage collection tank 1 is a pressure container, waste water mixed with 30% -50% of chloroethylene is collected into the drainage collection tank 1 from the feeding pipe 7, and under the action of steam in the steam tracing pipe 9, part of chloroethylene in the drainage collection tank 1 is recovered to a gas cabinet from the exhaust pipe 8 in a gas state, so that the recovery of part of chloroethylene is realized.

An outlet of the drainage collection tank 1 is communicated with an inlet of the wastewater tank 2 through a pipeline, an outlet of the wastewater tank 2 is communicated with a first inlet of a first heat exchanger 3 through a pump, a first outlet of the first heat exchanger 3 is communicated with an inlet of a stripping tower 4, and materials in the wastewater tank 2 are sent into the stripping tower 4 for stripping treatment after heat exchange through the first heat exchanger 3 under the action of the pump; a wastewater outlet at the bottom of the stripping tower 4 is communicated with a second inlet of the first heat exchanger 3, a second outlet of the first heat exchanger 3 is communicated with a wastewater recovery pipeline 10, and the bottom of the stripping tower 4 is communicated with a steam pipeline 11; the top of the stripping tower 4 is communicated with a condenser 12, a gas outlet of the condenser 12 is communicated with an inlet of a vacuum pump 5, an outlet of the vacuum pump 5 is communicated with an inlet of a gas-liquid separator 6, and a gas outlet of the gas-liquid separator 6 is communicated with a waste gas collecting pipeline 13; introducing high-temperature steam with the temperature of 170-180 ℃ into the bottom of the stripping tower 4 to strip the wastewater containing the vinyl chloride in the stripping tower 4, so that the vinyl chloride in the wastewater is removed, sending vinyl chloride gas and part of the steam into the gas-liquid separator 6 through the condenser 12 under the action of the vacuum pump 5, discharging the separated vinyl chloride from the top of the gas-liquid separator 6 into a gas cabinet through the waste gas collecting pipeline 13, and recycling the separated vinyl chloride; meanwhile, under the action of the condenser 12, part of steam is liquefied into wastewater and then flows back into the stripping tower 4, the temperature of the wastewater in the stripping tower 4 is still high, so that the wastewater is subjected to heat exchange with the wastewater discharged from the wastewater tank 2 through the first heat exchanger 3, and the wastewater is sent to the mother liquor hydration device from the wastewater recovery pipeline 10 after heat exchange for recycling treatment, so that the waste of water resources is effectively avoided, the production water consumption of a workshop is favorably reduced, the temperature of the part of wastewater reaches 60 ℃, and the heat in the wastewater is recovered while the wastewater is recovered; from this, through the utility model discloses can carry out effective processing to the free drainage that contains vinyl in the polyvinyl chloride production process, effectively avoid the potential safety hazard of manual operation direct discharge process.

The system also comprises a second heat exchanger 14 and a delivery pump 15, wherein an inlet of the delivery pump 15 is communicated with a liquid outlet of the gas-liquid separator 6, an outlet of the delivery pump 15 is communicated with a first inlet of the second heat exchanger 14, a first outlet of the second heat exchanger 14 is communicated with a liquid inlet of the condenser 12, a gas outlet of the condenser 12 is communicated with a second inlet of the second heat exchanger 14, and a second outlet of the second heat exchanger 14 is communicated with an inlet of the vacuum pump 5; compared with the temperature of the gas discharged from the condenser 12, the temperature of the liquid separated by the gas-liquid separator 6 is lower, therefore, the liquid separated by the gas-liquid separator 6 is sent into the second heat exchanger 14 through the delivery pump 15, the gas discharged into the second heat exchanger 14 from the condenser 12 is subjected to heat exchange and temperature reduction, and the cooled gas enters the vacuum pump 5 again, so that the vacuum pump 5 is protected, and the service life of the vacuum pump is prolonged.

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 (2)

1. A wastewater stripping treatment system is characterized by comprising a drainage collection tank, a wastewater tank, a first heat exchanger, a stripping tower, a vacuum pump and a gas-liquid separator;

the drainage collection tank is communicated with a feeding pipe and an exhaust pipe, and the outer wall of the drainage collection tank is wound with a steam tracing pipe; an outlet of the drainage collection tank is communicated with an inlet of the waste water tank through a pipeline, an outlet of the waste water tank is communicated with a first inlet of the first heat exchanger through a pump, a first outlet of the first heat exchanger is communicated with an inlet of the stripping tower, a waste water outlet at the bottom of the stripping tower is communicated with a second inlet of the first heat exchanger, a second outlet of the first heat exchanger is communicated with a waste water recovery pipeline, and the bottom of the stripping tower is communicated with a steam pipeline; the top intercommunication of stripper has the condenser, the gas outlet of condenser with the import intercommunication of vacuum pump, the export of vacuum pump with gas-liquid separator's import intercommunication, gas-liquid separator's gas outlet intercommunication has the waste gas collection pipeline.

2. The wastewater stripping treatment system according to claim 1, characterized by further comprising a second heat exchanger and a delivery pump, wherein an inlet of the delivery pump is communicated with the liquid outlet of the gas-liquid separator, an outlet of the delivery pump is communicated with a first inlet of the second heat exchanger, a first outlet of the second heat exchanger is communicated with the liquid inlet of the condenser, a gas outlet of the condenser is communicated with a second inlet of the second heat exchanger, and a second outlet of the second heat exchanger is communicated with an inlet of the vacuum pump.

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