CN207276523U - The system that ethene, iso-butane and nitrogen are recycled from polyethylene engineering tail gas - Google Patents
The system that ethene, iso-butane and nitrogen are recycled from polyethylene engineering tail gas Download PDFInfo
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Abstract
The system of ethene, iso-butane and nitrogen is recycled in the slave polyethylene engineering tail gas of the utility model to be included：First-class heat exchanger, the first gas-liquid separator, secondary heat exchanger, the second gas-liquid separator, the 3rd gas-liquid separator, level Four heat exchanger, the 4th gas-liquid separator.The technical solution of the utility model is simple in structure, efficiency is higher, can be very good processing polyethylene engineering tail gas.
Description
Technical field
The recycling of chemical industry tail gas is the utility model is related to, is recycled more particularly to one kind from polyethylene engineering tail gas
The system of ethene, iso-butane and nitrogen.
Background technology
Polyethylene (PE) is the kind of yield maximum in general synthetic resin, product include low density polyethylene (LDPE) (LDPE),
Linear low density polyethylene (LLDPE) (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE) (HDPE) etc..The characteristics of polyethylene
It is cheap, better performances, can be widely applied to the fields such as industry, agricultural, packaging.
In order to maintain the stabilization of polyethylene reactor each component and discharges material, it is necessary to discharge unit hydrocarbon-rich tail gas, and
Other units are there is also expendable-limited-recoverable tail gas, so if being recycled to these tail gas, it will increase the yield of product,
Avoid tail gas from being directly discharged to torch, cause the waste of resource and the pollution of environment.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of efficiency is higher, can be very good to utilize polyethylene work
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of journey tail gas.
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model, including：
It is described for the first-class heat exchanger to cool to the iso-butane lightness-removing column tower top tail gas in polyethylene engineering tail gas
First-class heat exchanger is connected with first throttle valve by pipeline, and first throttle valve connects 4 efferent duct of carbon by pipeline, and the carbon 4 is defeated
Outlet pipe passes through first-class heat exchanger；
For carrying out gas-liquid separation to tail gas after the first seperation film in polyethylene engineering tail gas, make the first seperation film rear molding
Qi leel separates out the first gas-liquid separator of the first gas phase and the first liquid phase, and tail gas input pipe exchanges heat by level-one after the first seperation film
Device is connected with the inlet port of the first gas-liquid separator；
For the secondary heat exchanger to cool to the first gas phase, it is connected with the first gas-liquid separator by pipeline；
For carrying out gas-liquid separation to the first gas phase after cooling, the first gas phase is set to isolate the second gas phase and second
Second gas-liquid separator of liquid phase, is connected with secondary heat exchanger by pipeline；
For carrying out gas-liquid separation to tail gas after the second seperation film in polyethylene engineering tail gas, make the second seperation film rear molding
Qi leel separates out the 3rd gas-liquid separator of the 3rd gas phase and the 3rd liquid phase, and tail gas input pipe exchanges heat by level-one after the second seperation film
Device, secondary heat exchanger, three-level heat exchanger are connected with the inlet port of the 3rd gas-liquid separator；
For the level Four heat exchanger to cool to the 3rd gas phase, it is connected with the 3rd gas-liquid separator；
For carrying out gas-liquid separation to the 3rd gas phase after cooling, the 3rd gas phase is set to isolate the 4th gas phase and the 4th
4th gas-liquid separator of liquid phase, is connected with level Four heat exchanger by pipeline.
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model, wherein, the first gas
First liquid phase discharge pipe of liquid/gas separator is connected with 4 efferent duct of carbon.
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model, wherein, the second gas
The second liquid phase efferent duct of liquid/gas separator is connected with 2 efferent duct of carbon, and second throttle, carbon 2 are provided with second liquid phase efferent duct
Efferent duct is by first-class heat exchanger, secondary heat exchanger, the second gas phase efferent duct and the torch gas efferent duct of the second gas-liquid separator
Connection, torch gas efferent duct is by secondary heat exchanger, first-class heat exchanger.
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model, wherein, the 3rd gas
Be provided with the 3rd throttle valve on 3rd liquid phase efferent duct of liquid/gas separator, the 3rd liquid phase efferent duct after three-level heat exchanger with carbon
2 efferent ducts connect.
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model, wherein, the 4th gas
4th gas phase efferent duct of liquid/gas separator is connected by level Four heat exchanger, three-level heat exchanger with torch gas efferent duct, the 4th gas-liquid
4th gas phase efferent duct of separator is connected by level Four heat exchanger, three-level heat exchanger with rich nitrogen efferent duct, rich nitrogen output
Pipe is by expanding machine, three-level heat exchanger, secondary heat exchanger, first-class heat exchanger.
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model, including：
It is described for the first-class heat exchanger to cool to the iso-butane lightness-removing column tower top tail gas in polyethylene engineering tail gas
First-class heat exchanger is connected with first throttle valve by pipeline, and first throttle valve connects 4 efferent duct of carbon by pipeline, and the carbon 4 is defeated
Outlet pipe passes through first-class heat exchanger；
For carrying out gas-liquid separation to tail gas after the first seperation film in polyethylene engineering tail gas, make the first seperation film rear molding
Qi leel separates out the first gas-liquid separator of the first gas phase and the first liquid phase, and tail gas input pipe exchanges heat by level-one after the first seperation film
Device is connected with the inlet port of the first gas-liquid separator；
For the secondary heat exchanger to cool to the first gas phase, it is connected with the first gas-liquid separator by pipeline；
For carrying out gas-liquid separation to the first gas phase after cooling, the first gas phase is set to isolate the second gas phase and second
Second gas-liquid separator of liquid phase, is connected with secondary heat exchanger by pipeline；
For carrying out rectifying to tail gas after the second seperation film in polyethylene engineering tail gas, make tail gas essence after the second seperation film
The rectifying column of top gaseous phase and bottom of towe liquid phase is distillated, tail gas input pipe is by first-class heat exchanger, secondary heat exchange after the second seperation film
The inlet port connection of device, three-level heat exchanger and rectifying column；
For carrying out gas-liquid separation to top gaseous phase, top gaseous phase is set to isolate the 3rd gas of the 3rd gas phase and the 3rd liquid phase
Liquid/gas separator, is connected with rectifying column by top gaseous phase input pipe, and top gaseous phase input pipe passes through level Four heat exchanger；
For the level Four heat exchanger to cool to the 3rd gas phase, it is connected with the 3rd gas-liquid separator；
For carrying out gas-liquid separation to the 3rd gas phase after cooling, the 3rd gas phase is set to isolate the 4th gas phase and the 4th
4th gas-liquid separator of liquid phase, is connected with level Four heat exchanger by pipeline.
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model, wherein, the second gas
The second liquid phase efferent duct of liquid/gas separator is connected with 2 efferent duct of carbon, and second throttle, carbon 2 are provided with second liquid phase efferent duct
Efferent duct is by first-class heat exchanger, secondary heat exchanger, the second gas phase efferent duct and the torch gas efferent duct of the second gas-liquid separator
Connection, torch gas efferent duct pass through secondary heat exchanger, first-class heat exchanger, the 3rd are provided with the bottom of towe liquid phase efferent duct of rectifying column
Throttle valve, bottom of towe liquid phase efferent duct are connected after three-level heat exchanger with 2 efferent duct of carbon.
The technical solution of the utility model is simple in structure, efficiency is higher, can be very good processing polyethylene engineering tail gas.
Brief description of the drawings
Fig. 1 is the implementation for the system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model
The structure diagram of example one；
Fig. 2 is the implementation for the system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model
The structure diagram of example two.
Embodiment
Embodiment one
As shown in Figure 1, the system of ethene, iso-butane and nitrogen is recycled in the slave polyethylene engineering tail gas of the utility model,
Including：
For the first-class heat exchanger E1 to cool to the iso-butane lightness-removing column tower top tail gas in polyethylene engineering tail gas, one
Level heat exchanger is connected with first throttle valve L1 by pipeline, and first throttle valve connects 4 efferent duct of carbon, 4 efferent duct of carbon by pipeline
By first-class heat exchanger；
For carrying out gas-liquid separation to tail gas after the first seperation film in polyethylene engineering tail gas, make the first seperation film rear molding
Qi leel separates out the first gas-liquid separator V1 of the first gas phase and the first liquid phase, and tail gas input pipe is changed by level-one after the first seperation film
Hot device is connected with the inlet port of the first gas-liquid separator；
For the secondary heat exchanger E2 to cool to the first gas phase, it is connected with the first gas-liquid separator by pipeline；
For carrying out gas-liquid separation to the first gas phase after cooling, the first gas phase is set to isolate the second gas phase and second
Second gas-liquid separator V2 of liquid phase, is connected with secondary heat exchanger E2 by pipeline；
For carrying out gas-liquid separation to tail gas after the second seperation film in polyethylene engineering tail gas, make the second seperation film rear molding
Qi leel separates out the 3rd gas-liquid separator V3 of the 3rd gas phase and the 3rd liquid phase, and tail gas input pipe passes through one successively after the second seperation film
Level heat exchanger, secondary heat exchanger, three-level heat exchanger E3 are connected with the inlet port of the 3rd gas-liquid separator；
For the level Four heat exchanger E4 to cool to the 3rd gas phase, it is connected with the 3rd gas-liquid separator V3；
For carrying out gas-liquid separation to the 3rd gas phase after cooling, the 3rd gas phase is set to isolate the 4th gas phase and the 4th
4th gas-liquid separator V4 of liquid phase, is connected with level Four heat exchanger E4 by pipeline.
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model, wherein, the first gas
First liquid phase discharge pipe of liquid/gas separator is connected with 4 efferent duct of carbon.
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model, wherein, the second gas
The second liquid phase efferent duct of liquid/gas separator is connected with 2 efferent duct of carbon, and second throttle L2, carbon are provided with second liquid phase efferent duct
2 efferent ducts are defeated by first-class heat exchanger, secondary heat exchanger, the second gas phase efferent duct and torch gas of the second gas-liquid separator successively
Outlet pipe connects, and torch gas efferent duct is successively by secondary heat exchanger, first-class heat exchanger.
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model, wherein, the 3rd gas
Be provided with the 3rd throttle valve L3 on 3rd liquid phase efferent duct of liquid/gas separator, the 3rd liquid phase efferent duct after three-level heat exchanger with
2 efferent duct of carbon connects.
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model, wherein, the 4th gas
4th gas phase efferent duct of liquid/gas separator is connected by level Four heat exchanger E4, three-level heat exchanger with torch gas efferent duct successively, the
4th gas phase efferent duct of four gas-liquid separators is connected by level Four heat exchanger, three-level heat exchanger with rich nitrogen efferent duct successively,
Rich nitrogen efferent duct is successively by expanding machine ET1, three-level heat exchanger, secondary heat exchanger, first-class heat exchanger.
Embodiment two
With reference to shown in Fig. 2, recycle ethene, iso-butane and nitrogen in the slave polyethylene engineering tail gas of the utility model is
System, including：
For the first-class heat exchanger E1 to cool to the iso-butane lightness-removing column tower top tail gas in polyethylene engineering tail gas, one
Level heat exchanger E1 is connected with first throttle valve L1 by pipeline, and first throttle valve L1 connects 4 efferent duct of carbon by pipeline, and carbon 4 is defeated
Outlet pipe passes through first-class heat exchanger E1；
For carrying out gas-liquid separation to tail gas after the first seperation film in polyethylene engineering tail gas, make the first seperation film rear molding
Qi leel separates out the first gas-liquid separator V1 of the first gas phase and the first liquid phase, and tail gas input pipe is changed by level-one after the first seperation film
Hot device E1 is connected with the inlet port of the first gas-liquid separator V1；
For the secondary heat exchanger E2 to cool to the first gas phase, it is connected with the first gas-liquid separator V1 by pipeline；
For carrying out gas-liquid separation to the first gas phase after cooling, the first gas phase is set to isolate the second gas phase and second
Second gas-liquid separator V2 of liquid phase, is connected with secondary heat exchanger E2 by pipeline；
For carrying out rectifying to tail gas after the second seperation film in polyethylene engineering tail gas, make tail gas essence after the second seperation film
Distillate the rectifying column T1 of top gaseous phase and bottom of towe liquid phase, after the second seperation film tail gas input pipe successively by first-class heat exchanger E1,
Secondary heat exchanger E2, three-level heat exchanger E3 are connected with the inlet port of rectifying column T1；
For carrying out gas-liquid separation to top gaseous phase, top gaseous phase is set to isolate the 3rd gas of the 3rd gas phase and the 3rd liquid phase
Liquid/gas separator V3, is connected with rectifying column by top gaseous phase input pipe, and top gaseous phase input pipe passes through level Four heat exchanger E4；
For the level Four heat exchanger E4 to cool to the 3rd gas phase, it is connected with the 3rd gas-liquid separator V3；
For carrying out gas-liquid separation to the 3rd gas phase after cooling, the 3rd gas phase is set to isolate the 4th gas phase and the 4th
4th gas-liquid separator V4 of liquid phase, is connected with level Four heat exchanger E4 by pipeline.
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model, wherein, the second gas
The second liquid phase efferent duct of liquid/gas separator is connected with 2 efferent duct of carbon, and second throttle L2, carbon are provided with second liquid phase efferent duct
2 efferent ducts are successively by first-class heat exchanger E1, the second gas phase efferent duct and the fire of secondary heat exchanger E2, the second gas-liquid separator V2
Torch gas efferent duct connects, and torch gas efferent duct passes through secondary heat exchanger E2, first-class heat exchanger E1, the bottom of towe liquid phase of rectifying column successively
The 3rd throttle valve L3 is provided with efferent duct, bottom of towe liquid phase efferent duct is connected after three-level heat exchanger E3 with 2 efferent duct of carbon.
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model, wherein, the 3rd gas
The 3rd liquid phase efferent duct of liquid/gas separator V3 is connected with rectifying column T1, so that the 3rd liquid phase flows back to rectifying column T1 rectifying.
The technical solution of the utility model is simple in structure, efficiency is higher, can be very good processing polyethylene engineering tail gas.
The system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model, wherein, expanding machine
For gas bearing expanding machine, above-mentioned all heat exchangers are plate-fin heat exchanger.
Polyethylene engineering tail gas is mainly that x-5002 secondary membranes ooze residual air, c-5002 iso-butane lightness-removing columns top tail gas and x-
Residual air is oozed in the recycling of 3002 intermediate treatment films, or the combination of any of the above material.X-5002 secondary membranes are oozed main in residual air
Component is nitrogen, its content 80% or so.Main component is ethene, iso-butane and second in the tail gas of c-5002 iso-butane lightness-removing columns top
Alkane, its content are respectively 52%, 31%, 14% or so.
It is ethene, iso-butane, hydrogen and ethane that main component in residual air is oozed in the recycling of x-3002 intermediate treatments film, its content is divided
Wei 25%, 19%, 28%, 18% or so.
Above-mentioned iso-butane lightness-removing column tower top tail gas is c-5002 iso-butane lightness-removing columns top tail gas, that is, in Fig. 1, Fig. 2
C-5002 tower top tail gas；
It is the x-5002 films after above-mentioned second seperation film in tail gas, that is, Fig. 1, Fig. 2 that x-5002 secondary membranes, which ooze residual air,
Tail gas afterwards；
It is after above-mentioned first seperation film in tail gas, that is, Fig. 1, Fig. 2 that residual air is oozed in the recycling of x-3002 intermediate treatments film
Tail gas after x-3002 films.
The system carries out swell refrigeration, technological process is stablized can without additional refrigeration plant using the pressure itself of tail gas
Lean on, be a kind of typical energy-saving environmental protection device.
The advantages of the technical solution of the utility model is：The system is more than 95% to the rate of recovery of ethene and ethane, to different
The rate of recovery of butane is more than 99%, and the rate of recovery of alkane is high, and nitrogen product purity 99%, and the rate of recovery 90%, makes tail gas
Utility value is high, and product yield is big, and purity is high, energy conservation and environmental protection.
Utilize the embodiment for the system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model
The flow of one progress polyethylene engineering vent gas treatment is as follows：
C-5002 iso-butane lightness-removing column tower top tail gas is cooled to -40 DEG C through first-class heat exchanger E1, is saved through first throttle valve L1
After stream decompression, the cooling box after first-class heat exchanger rewarming, obtains 4 product of carbon.
Tail gas after x-3002 seperation film films, cools to -40 DEG C through first-class heat exchanger E1, through the first gas-liquid separator V1
After separation, 4 product of carbon and the material after first throttle valve L1 throttlings of liquid phase converge, and gas phase is after secondary heat exchanger E2 coolings
Into the second gas-liquid separator V2,2 product of carbon of liquid phase imports 2 pipeline of carbon after second throttle L2 reducing pressure by regulating flow, and gas phase is converged
Enter torch gas pipeline.
Tail gas after x-5002 seperation film films, drops by first-class heat exchanger E1, secondary heat exchanger E2, three-level heat exchanger E3 successively
Wen Hou, into the 3rd gas-liquid separator V3, liquid phase is after the 3rd throttle valve L3 throttlings, by three-level heat exchanger E3 rewarmings, with the
After material after two throttle valve L2 throttlings converges, successively after secondary heat exchanger E2, first-class heat exchanger E1 rewarmings, obtain carbon 2 and produce
Product, gas phase is after level Four heat exchanger E4 coolings, and into the 4th gas-liquid separator V4, after gas-liquid separation, gas phase passes through level Four successively
After heat exchanger, three-level heat exchanger, secondary heat exchanger and first-class heat exchanger rewarming, flare system is gone, liquid phase is through the 4th throttle valve L4
After reducing pressure by regulating flow, through level Four heat exchanger and three-level heat exchanger rewarming, after expanding machine ET1 expansion coolings, three are entered back into
Level heat exchanger, secondary heat exchanger and first-class heat exchanger, obtain rich nitrogen product.
Utilize the embodiment for the system that ethene, iso-butane and nitrogen are recycled in the slave polyethylene engineering tail gas of the utility model
The flow of two progress polyethylene engineering vent gas treatments is as follows：
Difference lies in when unstripped gas goes out three-level heat exchanger, into rectifying column T1, tower top with the workflow of embodiment one
Gas phase is cooled down into level Four heat exchanger, and into the 3rd gas-liquid separator V3, the separated liquid phases of the 3rd gas-liquid separator V3 enter essence
Tower is evaporated, the 3rd separated gas phases of gas-liquid separator V3 enter level Four heat exchanger, and the bottom of towe liquid phase of rectifying column is after the throttle throttling
It is connected after three-level heat exchanger E3 with 2 efferent duct of carbon.
It the above is only the preferred embodiment of the utility model, it is noted that for the ordinary skill people of the art
For member, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as the scope of protection of the utility model.
Claims (7)
1. the system of ethene, iso-butane and nitrogen is recycled in a kind of engineering tail gas from polyethylene, it is characterised in that including：
For the first-class heat exchanger to cool to the iso-butane lightness-removing column tower top tail gas in polyethylene engineering tail gas, the level-one
Heat exchanger is connected with first throttle valve by pipeline, and first throttle valve connects 4 efferent duct of carbon, 4 efferent duct of carbon by pipeline
By first-class heat exchanger；
For carrying out gas-liquid separation to tail gas after the first seperation film in polyethylene engineering tail gas, make the first seperation film rear molding qi leel
Separate out the first gas-liquid separator of the first gas phase and the first liquid phase, after the first seperation film tail gas input pipe by first-class heat exchanger with
The inlet port connection of first gas-liquid separator；
For the secondary heat exchanger to cool to the first gas phase, it is connected with the first gas-liquid separator by pipeline；
For carrying out gas-liquid separation to the first gas phase after cooling, the first gas phase is set to isolate the second gas phase and second liquid phase
The second gas-liquid separator, be connected with secondary heat exchanger by pipeline；
For carrying out gas-liquid separation to tail gas after the second seperation film in polyethylene engineering tail gas, make the second seperation film rear molding qi leel
Separate out the 3rd gas-liquid separator of the 3rd gas phase and the 3rd liquid phase, after the second seperation film tail gas input pipe by first-class heat exchanger,
Secondary heat exchanger, three-level heat exchanger are connected with the inlet port of the 3rd gas-liquid separator；
For the level Four heat exchanger to cool to the 3rd gas phase, it is connected with the 3rd gas-liquid separator；
For carrying out gas-liquid separation to the 3rd gas phase after cooling, the 3rd gas phase is set to isolate the 4th gas phase and the 4th liquid phase
The 4th gas-liquid separator, be connected with level Four heat exchanger by pipeline.
2. recycling the system of ethene, iso-butane and nitrogen from polyethylene engineering tail gas as claimed in claim 1, its feature exists
In the first liquid phase discharge pipe of the first gas-liquid separator is connected with 4 efferent duct of carbon.
3. recycling the system of ethene, iso-butane and nitrogen from polyethylene engineering tail gas as claimed in claim 2, its feature exists
In the second liquid phase efferent duct of the second gas-liquid separator is connected with 2 efferent duct of carbon, and the second section is provided with second liquid phase efferent duct
Valve is flowed, 2 efferent duct of carbon is by first-class heat exchanger, secondary heat exchanger, the second gas phase efferent duct and torch of the second gas-liquid separator
Gas efferent duct connects, and torch gas efferent duct is by secondary heat exchanger, first-class heat exchanger.
4. recycling the system of ethene, iso-butane and nitrogen from polyethylene engineering tail gas as claimed in claim 3, its feature exists
In being provided with the 3rd throttle valve on the 3rd liquid phase efferent duct of the 3rd gas-liquid separator, the 3rd liquid phase efferent duct is changed by three-level
It is connected after hot device with 2 efferent duct of carbon.
5. recycling the system of ethene, iso-butane and nitrogen from polyethylene engineering tail gas as claimed in claim 4, its feature exists
In, the 4th gas phase efferent duct of the 4th gas-liquid separator is connected by level Four heat exchanger, three-level heat exchanger with torch gas efferent duct,
4th gas phase efferent duct of the 4th gas-liquid separator is connected by level Four heat exchanger, three-level heat exchanger with rich nitrogen efferent duct, rich
Nitrogen efferent duct is by expanding machine, three-level heat exchanger, secondary heat exchanger, first-class heat exchanger.
6. the system of ethene, iso-butane and nitrogen is recycled in a kind of engineering tail gas from polyethylene, it is characterised in that including：
For the first-class heat exchanger to cool to the iso-butane lightness-removing column tower top tail gas in polyethylene engineering tail gas, the level-one
Heat exchanger is connected with first throttle valve by pipeline, and first throttle valve connects 4 efferent duct of carbon, 4 efferent duct of carbon by pipeline
By first-class heat exchanger；
For carrying out gas-liquid separation to tail gas after the first seperation film in polyethylene engineering tail gas, make the first seperation film rear molding qi leel
Separate out the first gas-liquid separator of the first gas phase and the first liquid phase, after the first seperation film tail gas input pipe by first-class heat exchanger with
The inlet port connection of first gas-liquid separator；
For the secondary heat exchanger to cool to the first gas phase, it is connected with the first gas-liquid separator by pipeline；
For carrying out gas-liquid separation to the first gas phase after cooling, the first gas phase is set to isolate the second gas phase and second liquid phase
The second gas-liquid separator, be connected with secondary heat exchanger by pipeline；
For to after the second seperation film in polyethylene engineering tail gas tail gas carry out rectifying, after making the second seperation film tail gas rectifying go out
The rectifying column of top gaseous phase and bottom of towe liquid phase, tail gas input pipe is by first-class heat exchanger, secondary heat exchanger, three after the second seperation film
The inlet port of level heat exchanger and rectifying column connects；
For carrying out gas-liquid separation to top gaseous phase, top gaseous phase is set to isolate the 3rd gas-liquid point of the 3rd gas phase and the 3rd liquid phase
From device, it is connected with rectifying column by top gaseous phase input pipe, top gaseous phase input pipe passes through level Four heat exchanger；
For the level Four heat exchanger to cool to the 3rd gas phase, it is connected with the 3rd gas-liquid separator；
For carrying out gas-liquid separation to the 3rd gas phase after cooling, the 3rd gas phase is set to isolate the 4th gas phase and the 4th liquid phase
The 4th gas-liquid separator, be connected with level Four heat exchanger by pipeline.
7. recycling the system of ethene, iso-butane and nitrogen from polyethylene engineering tail gas as claimed in claim 6, its feature exists
In the second liquid phase efferent duct of the second gas-liquid separator is connected with 2 efferent duct of carbon, and the second section is provided with second liquid phase efferent duct
Valve is flowed, 2 efferent duct of carbon is by first-class heat exchanger, secondary heat exchanger, the second gas phase efferent duct and torch of the second gas-liquid separator
Gas efferent duct connects, and torch gas efferent duct passes through secondary heat exchanger, first-class heat exchanger, is set on the bottom of towe liquid phase efferent duct of rectifying column
The 3rd throttle valve is equipped with, bottom of towe liquid phase efferent duct is connected after three-level heat exchanger with 2 efferent duct of carbon.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721252159.8U CN207276523U (en) | 2017-09-27 | 2017-09-27 | The system that ethene, iso-butane and nitrogen are recycled from polyethylene engineering tail gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721252159.8U CN207276523U (en) | 2017-09-27 | 2017-09-27 | The system that ethene, iso-butane and nitrogen are recycled from polyethylene engineering tail gas |
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| CN207276523U true CN207276523U (en) | 2018-04-27 |
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| CN201721252159.8U Active CN207276523U (en) | 2017-09-27 | 2017-09-27 | The system that ethene, iso-butane and nitrogen are recycled from polyethylene engineering tail gas |
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