CN105944400B - The piece-rate system and technique of effective Propylene recovery in refrigeration station fixed gas discharge process - Google Patents
The piece-rate system and technique of effective Propylene recovery in refrigeration station fixed gas discharge process Download PDFInfo
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- CN105944400B CN105944400B CN201610453068.4A CN201610453068A CN105944400B CN 105944400 B CN105944400 B CN 105944400B CN 201610453068 A CN201610453068 A CN 201610453068A CN 105944400 B CN105944400 B CN 105944400B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
- B01D5/0048—Barometric condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
- B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
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- Environmental & Geological Engineering (AREA)
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- Separation By Low-Temperature Treatments (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention provides the piece-rate system and technique of effective Propylene recovery in a kind of refrigeration station fixed gas discharge process, which includes step in detail below：A, tube side that the propylene containing fixed gas from refrigeration station is sent into propylene/fixed gas heat exchanger first carries out heat exchange cooling, obtains fixed gas and solution-airmixture；B, the obtained fixed gases of step a and solution-airmixture are respectively fed to propylene separation device to detach, obtain fixed gas and propylene lime set；C, the propylene lime set for obtaining step b carries out reduced pressure treatment, obtain the propylene lime set after reduced pressure treatment, the propylene lime set after reduced pressure treatment is sent into the propylene containing fixed gas in the shell side and tube side of propylene/fixed gas heat exchanger again to exchange heat, obtains propylene steam.Using the propylene in system provided by the invention and technique Propylene recovery refrigeration system driving fixed gas discharge process, in fixed gas 95% or more propylene can be effectively recycled in refrigeration station startup procedure.
Description
Technical field
The present invention relates to the piece-rate systems and technique of effective Propylene recovery in a kind of refrigeration station fixed gas discharge process, belong to
Chemical technology field.
Background technology
The incoagulabilities gas such as free gas, nitrogen, lube vapor can often be assembled in the condenser, reservoir of refrigeration system
Body, these incoagulable gas circulative accumulation in propylene refrigeration system, neither condenses with propylene, does not also generate refrigeration effect
It answers, the presence of system fixed gas will largely weaken the heat-transfer effect of condenser, make condensation temperature and condensing pressure liter
Height causes the power consumption of refrigeration compressor to increase.Therefore, in refrigeration system when accumulative fixed gas, it is necessary to discharge it in time.
For propylene refrigeration system when opening, stopping and repairing cleaning or be installed in addition with equipment, incoagulable gas can all enter system, especially
In the startup procedure of system, fixed gas discharge capacity is very big for it, and it is qualified first to replace entire refrigeration system with nitrogen so that is
Oxygen content is less than or equal to 0.02% in system.After oxygen concentration is up to standard, propylene is imported from propylene compressor inlet, is pressurized to
1.7MPaG or more, the nitrogen in exchange system, the fixed gas of formation is from discharge at the top of the condenser, reservoir of refrigeration system.When
The density of propylene of refrigeration working medium reaches 99mol% or more in system, and fixed gas discharge can just stop, this usual process needs about 4
Hour.
Propylene refrigeration system driving discharge fixed gas has the characteristics that：1) moment discharge capacity is big.With 600,000 tons/year of coal systems
For the mating propylene refrigeration station of methanol project, according to field statistics in driving process due to discharging fixed gas, propylene is caused to damage
It fails to keep an appointment 50 tons.In terms of 8000 yuan/ton of the propylene market price, this set propylene refrigeration system loses nearly 400,000 yuan in driving process；
2) system fixed gas can not avoid.When being primarily present in refrigeration compressor set cold start, medium pressure nitrogen gas as primary seal gas,
Primary seal gas could be changed by medium pressure nitrogen autogenous cutting when the pressure difference between compressor outlet and secondary balancing pipe is more than 40KPa
At compressor outlet propylene gas；3) fixed gas can not empty completely.Fixed gas content highest when just driving, with startup procedure
It carries out, fixed gas is constantly reduced, and the fixed gas in final system is reduced to minimum.
Currently, the position that fixed gas easily gathers in condenser and propylene storage tank in industrial propylene refrigeration system is designed with and puts
Empty valve, when driving, can open blow valve and directly arrange fixed gas to air.But in line fixed gas cost is very big, because of containing for fixed gas
Amount is not high, and the propylene for being discharged into air simultaneously with fixed gas is more much more than fixed gas, and propylene is caused largely to lose, while can also be dirty
Contaminate environment, it is also possible to damage to operating personnel.Live driving personnel have also attempted some Measures of technical：(1) increase by 1 to penetrate
System is evacuated to negative pressure after system displacement is qualified, then refills propylene by vapour air extractor or vacuum pump；(2) 1 is added to unload
Suction port of compressor is connected at the top of propylene storage tank by compressor, and compressor outlet is connected at the top of tank car, then by tank car bottom and third
Alkene reservoir bottom is connected to, and unlatching is unloaded after compressor, and pressure difference will be established between tank car and propylene storage tank, and propylene liquid can be automatic
Flow into storage tank.But the above measure increases driving cost and operation difficulty, and in same startup procedure, discharge unit volume
Fixed gas, the number of dropouts of propylene is not reduced.
Therefore, the piece-rate system and technique for developing effectively Propylene recovery in a kind of refrigeration station fixed gas discharge process have become
For this field urgent need to resolve the technical issues of.
Invention content
In order to solve above-mentioned disadvantage and deficiency, the purpose of the present invention is to provide a kind of refrigeration station fixed gas discharge process
In effectively Propylene recovery separating technology.
The present invention also aims to provide one kind effectively to recycle in above-mentioned refrigeration station fixed gas discharge process
The system of the separating technology of propylene.
In order to achieve the above objectives, on the one hand, effectively recycle third in a kind of refrigeration station fixed gas discharge process of present invention offer
The separating technology of alkene, the technique include step in detail below：
A, the tube side that the propylene containing fixed gas from refrigeration station is sent into propylene/fixed gas heat exchanger first changes
Heat drop temperature obtains fixed gas and solution-airmixture；
B, the obtained fixed gases of step a and solution-airmixture are respectively fed to propylene separation device to detach, are not coagulated
Gas and propylene lime set；
C, the propylene lime set obtained step b carries out reduced pressure treatment, obtains the propylene lime set after reduced pressure treatment, then will be through
Propylene lime set after reduced pressure treatment is sent into the propylene containing fixed gas in the shell side and tube side of propylene/fixed gas heat exchanger and is changed
Heat obtains propylene steam.
Technique according to the present invention, it is preferable that cooling described in step a is to cool the temperature to -35~-40 DEG C.
Technique according to the present invention, it is preferable that further include obtaining step b not between the step b and step c
Solidifying gas carries out the operation of feeding torch after reduced pressure treatment；
It is highly preferred that the operation includes the following steps：It, will be through subtracting after the fixed gas that step b is obtained carries out reduced pressure treatment
Pressure treated fixed gas individually exchanges heat with the propylene containing fixed gas from refrigeration station in advance to recycle its cold, then will be through
Fixed gas after heat exchange heating is sent into torch.The present invention does not make specific requirement, this field skill to the pressure of fixed gas reduced pressure treatment
The specific pressure of flare system used determines the pressure when art personnel can be according to field operation.In specific embodiment party of the present invention
In formula, first throttle valve can be first passed through, reduced pressure treatment is carried out to the fixed gas that propylene separation device is isolated, then by itself and driving
Fixed gas then passes through pipeline after individually its cold is recycled in heat exchange (heat exchanger can in addition be arranged to carry out the heat exchange operation) in advance
It is sent to torch.
Technique according to the present invention, it is preferable that the reduced pressure treatment be the pressure of propylene lime set is down to 0.03~
0.04MPaG。
Technique according to the present invention, it is preferable that step c further includes operating in detail below：The propylene that step b is obtained
Lime set carries out first time reduced pressure treatment, and the propylene lime set after reduced pressure treatment is sent into propylene flash tank and is flashed, and recycles
Obtain propylene liguid；
Again from propylene flash tank extraction section propylene liguid, second of reduced pressure treatment is carried out to it, it will be after reduced pressure treatment
Propylene liguid be sent into propylene/fixed gas heat exchanger shell side and tube side in the propylene containing fixed gas exchange heat, obtain gas
State propylene.
Technique according to the present invention, it is preferable that the first time reduced pressure treatment is to be down to the pressure of propylene lime set
0.4~0.6MPaG.
Technique according to the present invention, it is preferable that second of reduced pressure treatment is to be down to the pressure of propylene liguid
0.03~0.04MPaG.
Technique according to the present invention, it is preferable that the temperature of the propylene steam is -38~-40 DEG C.
The propylene lime set decompression of technique according to the present invention, higher pressure can flash off a small amount of propylene steam, subsequently may be used
A small amount of propylene steam is back to the second separator.
In addition, the present invention does not make specific requirement to the amount of " operative liquid propylene ", those skilled in the art can be according to existing
During actual job, propylene flow, inlet temperature containing fixed gas in propylene/fixed gas heat exchanger tube pass etc. determine
Dosage for the liquid propene to exchange heat.
On the other hand, the present invention also provides one kind for realizing effectively being recycled in above-mentioned refrigeration station fixed gas discharge process
The system of the separating technology of propylene, the system include propylene/fixed gas heat exchanger 7 and propylene separation device 8；
It is described freezing station arrangement propylene condenser 3 and propylene storage tank 4 driving fixed gas outlet by pipeline with it is described
Fixed gas entrance in propylene/7 tube side of fixed gas heat exchanger is connected；
The liquid outlet of fixed gas outlet, tube side bottom at the top of the propylene/7 tube side of fixed gas heat exchanger passes through respectively
Pipeline is connected with the entrance of the propylene separation device 8, and the propylene steam outlet in the propylene/7 shell side of fixed gas heat exchanger is logical
Pipeline is crossed with the first separator 1 of 2 entrance of propylene compressor to be connected, the propylene compressor 2 outlet by pipeline with it is described cold
The entrance for freezing the propylene condenser 3 of station arrangement is connected；
The gas vent of the propylene separation device 8 is connected via first throttle valve 9 with torch by pipeline；The propylene separation
The liquid outlet of device 8 is connected via second throttle 10 with the shell side of the propylene/fixed gas heat exchanger 7 by pipeline.
System according to the present invention, it is preferable that the system further includes a propylene flash tank 5, the propylene separation device 8
Liquid outlet be connected with the liquid inlet of the propylene flash tank 5 via second throttle 10 by pipeline；
The liquid outlet of the propylene flash tank 5 passes through pipeline shell side, the liquid with the propylene/fixed gas heat exchanger 7 respectively
State propylene tank is connected, wherein on the pipeline between the liquid outlet and propylene of propylene flash tank 5/7 shell side of fixed gas heat exchanger
It is provided with third throttle valve 11；The gas vent of the propylene flash tank 5 is detached by pipeline with the second of 2 entrance of propylene compressor
Device 6 is connected.
System according to the present invention, it is preferable that the fixed gas entrance in the propylene/7 tube side of fixed gas heat exchanger
It is provided with baffle.The effect of the baffle is to make to flow to by the gas and changing of propylene/7 tube-side inlet of fixed gas heat exchanger, in turn
A small amount of fixed gas is isolated, to reduce fixed gas content in tube side, improves the heat transfer coefficient of propylene/fixed gas heat exchanger.
System according to the present invention, it is preferable that the top of the propylene separation device 8 is provided with silk screen or blade foam removal
Device.
System according to the present invention, it is preferable that the propylene/fixed gas heat exchanger 7 is autoclave evaporating heat exchanger.
System according to the present invention, the first throttle valve 9 is the component that must be provided with, because of the pressure of flare system
Power is usually relatively low, generally 0.15MPaG, so being sent to again after needing the fixed gas isolated to propylene separation device to depressurize
Torch.
Compared with prior art, in refrigeration station fixed gas discharge process provided by the present invention effective Propylene recovery separation
System and technique have the following advantages：
First, the drawbacks of driving using regular direct emission fixed gas the present invention overcomes current refrigeration station, using this hair
The system of bright offer and the propylene in technique Propylene recovery refrigeration system driving fixed gas discharge process, can effectively recycle refrigeration station
In startup procedure in fixed gas 95% or more propylene；As it can be seen that system provided by the present invention and technique can be with high efficiente callbacks third
Alkene.
Secondly, technological process is simple, and number of devices is few, and equipment investment is low, and environmental pollution is minimum, shortens the time of driving,
Technical process is safe and reliable, and there is no dangerous larger techniques or equipment.It can be widely used in various refrigeration systems
Refrigerant-recovery effectively reduces operating cost, has reached good effects of energy saving and emission reduction.
In addition, economic benefit is more significant, the investment payback time is short.
Description of the drawings
Fig. 1 is the effectively piece-rate system structural representation of Propylene recovery in refrigeration station fixed gas discharge process provided by the invention
Figure.
Main Reference label declaration：
1, the first separator；
2, propylene compressor；
3, propylene condenser；
4, propylene storage tank；
5, propylene flash tank；
6, the second separator；
7, propylene/fixed gas heat exchanger；
8, propylene separation device；
9, first throttle valve；
10, second throttle；
11, third throttle valve.
Specific implementation mode
In order to which technical characteristic, purpose and the advantageous effect to the present invention are more clearly understood, in conjunction in detail below
Embodiment and Figure of description carry out following detailed description to technical scheme of the present invention, but should not be understood as can to of the invention
The restriction of practical range.
Embodiment 1
Present embodiments provide in a kind of refrigeration station fixed gas discharge process the effectively piece-rate system of Propylene recovery, structure
Schematic diagram is as shown in Figure 1, the system includes propylene/fixed gas heat exchanger 7 and propylene separation device 8；
It is described freezing station arrangement propylene condenser 3 and propylene storage tank 4 driving fixed gas outlet by pipeline with it is described
Fixed gas entrance in propylene/7 tube side of fixed gas heat exchanger is connected；
The liquid outlet of fixed gas outlet, tube side bottom at the top of the propylene/7 tube side of fixed gas heat exchanger passes through respectively
Pipeline is connected with the entrance of the propylene separation device 8, and the propylene steam outlet in the propylene/7 shell side of fixed gas heat exchanger is logical
Pipeline is crossed with the first separator 1 of 2 entrance of propylene compressor to be connected, the propylene compressor 2 outlet by pipeline with it is described cold
The entrance for freezing the propylene condenser 3 of station arrangement is connected；
The gas vent of the propylene separation device 8 is connected via first throttle valve 9 with torch by pipeline；
The system further includes a propylene flash tank 5, and the liquid outlet of the propylene separation device 8 is saved by pipeline via second
Stream valve 10 is connected with the liquid inlet of the propylene flash tank 5；
The liquid outlet of the propylene flash tank 5 passes through pipeline shell side, the liquid with the propylene/fixed gas heat exchanger 7 respectively
State propylene tank is connected, wherein on the pipeline between the liquid outlet and propylene of propylene flash tank 5/7 shell side of fixed gas heat exchanger
It is provided with third throttle valve 11；The gas vent of the propylene flash tank 5 is detached by pipeline with the second of 2 entrance of propylene compressor
Device 6 is connected；
The top of the propylene separation device 8 is provided with silk screen or blade demister.
The propylene/fixed gas heat exchanger 7 is autoclave evaporating heat exchanger；
Fixed gas entrance in the propylene/7 tube side of fixed gas heat exchanger is provided with baffle.
Embodiment 2
The effectively separating technology of Propylene recovery is present embodiments provided in a kind of refrigeration station fixed gas discharge process, is to adopt
It is realized with the system that embodiment 1 is provided, wherein the technique includes step in detail below：
Fixed gas flow average out to 3800Nm used in the present embodiment3/ h, wherein the about 92mol% containing propylene, pressure are
1.95MPaG, temperature are 40 DEG C.
The driving fixed gas being discharged from the propylene condenser 3 of freezing station arrangement and the top of propylene storage tank 4, into propylene/no
The tube side of solidifying gas heat exchanger 7 carries out heat exchange cooling, and temperature is reduced to -40 DEG C, and most of propylene is condensed, and forms gas -
Liquid mixture, into propylene separation device 8；Fixed gas 210Nm is obtained at 8 top of propylene separation device3/ h, wherein nitrogen content are
90mol% is decompressed to 0.2MPaG by pressure-control valve (first throttle valve 9) and is sent to torch.In the bottom of propylene separation device 8,
The propylene lime set of 6.7t/h is obtained, into second throttle 10, is decompressed to 0.6MPaG, temperature returns to propylene after being -40.7 DEG C and dodges
Steam slot 5.A part of (2.3t/h) propylene liguid is extracted out from propylene flash tank 5 to be decompressed into third throttle valve 11
0.04MPaG after temperature is -39.5 DEG C, is sent into propylene/7 shell side of fixed gas heat exchanger and exchanges heat with driving fixed gas, obtain -
39.8 DEG C of propylene steam, propylene steam return to the first separator 1 of 2 entrance of propylene compressor；
The gas vent of the propylene flash tank 5 is connected by pipeline with the second separator 6 of 2 entrance of propylene compressor；
The outlet of the propylene compressor 2 is connected by pipeline with the entrance of the propylene condenser 3 of the freezing station arrangement.
The gross investment of piece-rate system of effectively Propylene recovery is about in the refrigeration station fixed gas discharge process that embodiment 1 provides
350000 yuan.
In the embodiment 2,13.4 tons of the recyclable propylene of a startup procedure, yield 99.4%, annual recyclable second
About 53.6 tons of alkene, economic benefit (output value-equipment depreciation) reach 410,000 yuan/year, and the calculation formula of wherein yield is as follows：Yield=
(the propylene mass flow-in the propylene containing fixed gas is emitted into the propylene mass flow in the fixed gas of torch)/contain fixed gas
Propylene in propylene mass flow.
The foregoing is merely the embodiments of the more economical optimization of the present invention, are not intended to limit the invention, all at this
The principle of invention and within the scope of made by all any modification, equivalent and improvement etc., should be included in the protection model of the present invention
Within enclosing.
Claims (16)
1. the separating technology of effective Propylene recovery in a kind of refrigeration station fixed gas discharge process, which is characterized in that the technique includes
Step in detail below：
A, tube side that the propylene containing fixed gas from refrigeration station is sent into propylene/fixed gas heat exchanger first carries out heat exchange drop
Temperature obtains fixed gas and solution-airmixture；
B, the obtained fixed gases of step a and solution-airmixture propylene separation device is respectively fed to detach, obtain fixed gas and
Propylene lime set；
C, the propylene lime set for obtaining step b carries out reduced pressure treatment, obtains the propylene lime set after reduced pressure treatment, then will be through decompression
Propylene lime set that treated is sent into the propylene containing fixed gas in the shell side and tube side of propylene/fixed gas heat exchanger and exchanges heat,
Obtain propylene steam；
The technique is realized using the piece-rate system of effectively Propylene recovery in refrigeration station fixed gas discharge process, the system packet
Include propylene/fixed gas heat exchanger (7) and propylene separation device (8)；
It is described freezing station arrangement propylene condenser (3) and propylene storage tank (4) driving fixed gas outlet by pipeline with it is described
Fixed gas entrance in propylene/fixed gas heat exchanger (7) tube side is connected；
The liquid outlet of fixed gas outlet, tube side bottom at the top of the propylene/fixed gas heat exchanger (7) tube side passes through pipe respectively
Road is connected with the entrance of the propylene separation device (8), the propylene steam outlet in the propylene/fixed gas heat exchanger (7) shell side
It is connected with first separator (1) of propylene compressor (2) entrance by pipeline, propylene compressor (2) outlet passes through pipeline
It is connected with the entrance of the propylene condenser (3) of the freezing station arrangement；
The gas vent of the propylene separation device (8) is connected via first throttle valve (9) with torch by pipeline；The propylene separation
The liquid outlet of device (8) is by pipeline via the shell side phase of second throttle (10) and the propylene/fixed gas heat exchanger (7)
Even.
2. technique according to claim 1, which is characterized in that cooling described in step a is to cool the temperature to -35~-40
℃。
3. technique according to claim 1, which is characterized in that further include obtaining step b between the step b and step c
The fixed gas arrived carries out the operation of feeding torch after reduced pressure treatment.
4. technique according to claim 3, which is characterized in that sent after the fixed gas that step b is obtained is carried out reduced pressure treatment
The operation for entering torch includes the following steps：After the fixed gas that step b is obtained carries out reduced pressure treatment, by after reduced pressure treatment not
Solidifying gas individually exchanges heat with the propylene containing fixed gas from refrigeration station in advance to recycle its cold, then will be after heat exchange heats up
Fixed gas is sent into torch.
5. technique according to claim 1, which is characterized in that reduced pressure treatment described in step c is by the pressure of propylene lime set
Power is down to 0.03~0.04MPaG.
6. technique according to claim 1, which is characterized in that step c further includes operating in detail below：Step b is obtained
Propylene lime set carry out first time reduced pressure treatment, propylene lime set after reduced pressure treatment is sent into propylene flash tank and is dodged
It steams, recycling obtains propylene liguid；
Again from propylene flash tank extraction section propylene liguid, second of reduced pressure treatment is carried out to it, by the liquid after reduced pressure treatment
State propylene is sent into the propylene containing fixed gas in the shell side and tube side of propylene/fixed gas heat exchanger and exchanges heat, and obtains gaseous state third
Alkene.
7. technique according to claim 6, which is characterized in that the first time reduced pressure treatment is by the pressure of propylene lime set
It is down to 0.4~0.6MPaG.
8. technique according to claim 6, which is characterized in that second of reduced pressure treatment is by the pressure of propylene liguid
It is down to 0.03~0.04MPaG.
9. technique according to claim 1 or 6, which is characterized in that the temperature of the propylene steam is -38~-40 DEG C.
10. technique according to claim 1, which is characterized in that effectively recycled in the refrigeration station fixed gas discharge process
The piece-rate system of propylene further includes a propylene flash tank (5), and the liquid outlet of the propylene separation device (8) is by pipeline via
Two throttle valves (10) are connected with the liquid inlet of the propylene flash tank (5)；
The liquid outlet of the propylene flash tank (5) passes through pipeline shell side, the liquid with the propylene/fixed gas heat exchanger (7) respectively
State propylene tank is connected, wherein the pipe between the liquid outlet and propylene of propylene flash tank (5)/fixed gas heat exchanger (7) shell side
Road is provided with third throttle valve (11)；The gas vent of the propylene flash tank (5) passes through pipeline and propylene compressor (2) entrance
The second separator (6) be connected.
11. the technique according to claim 1 or 10, which is characterized in that in the propylene/fixed gas heat exchanger (7) tube side
Fixed gas entrance be provided with baffle.
12. the technique according to claim 1 or 10, which is characterized in that be provided with silk at the top of the propylene separation device (8)
Net or blade demister.
13. the technique according to claim 1 or 10, which is characterized in that the propylene/fixed gas heat exchanger (7) is autoclave
Evaporating heat exchanger.
14. the piece-rate system of effective Propylene recovery in a kind of refrigeration station fixed gas discharge process, which is characterized in that the system includes
Propylene/fixed gas heat exchanger (7) and propylene separation device (8)；
It is described freezing station arrangement propylene condenser (3) and propylene storage tank (4) driving fixed gas outlet by pipeline with it is described
Fixed gas entrance in propylene/fixed gas heat exchanger (7) tube side is connected；
The liquid outlet of fixed gas outlet, tube side bottom at the top of the propylene/fixed gas heat exchanger (7) tube side passes through pipe respectively
Road is connected with the entrance of the propylene separation device (8), the propylene steam outlet in the propylene/fixed gas heat exchanger (7) shell side
It is connected with first separator (1) of propylene compressor (2) entrance by pipeline, propylene compressor (2) outlet passes through pipeline
It is connected with the entrance of the propylene condenser (3) of the freezing station arrangement；
The gas vent of the propylene separation device (8) is connected via first throttle valve (9) with torch by pipeline；The propylene separation
The liquid outlet of device (8) is by pipeline via the shell side phase of second throttle (10) and the propylene/fixed gas heat exchanger (7)
Even；
Fixed gas entrance in the propylene/fixed gas heat exchanger (7) tube side is provided with baffle；
It is provided with silk screen or blade demister at the top of the propylene separation device (8).
15. system according to claim 14, which is characterized in that the system further includes a propylene flash tank (5), and described third
The liquid outlet of alkene separator (8) is by pipeline via the liquid inlet phase of second throttle (10) and the propylene flash tank (5)
Even；
The liquid outlet of the propylene flash tank (5) passes through pipeline shell side, the liquid with the propylene/fixed gas heat exchanger (7) respectively
State propylene tank is connected, wherein the pipe between the liquid outlet and propylene of propylene flash tank (5)/fixed gas heat exchanger (7) shell side
Road is provided with third throttle valve (11)；The gas vent of the propylene flash tank (5) passes through pipeline and propylene compressor (2) entrance
The second separator (6) be connected.
16. the system according to claims 14 or 15, which is characterized in that the propylene/fixed gas heat exchanger (7) is autoclave
Evaporating heat exchanger.
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| DE2903008A1 (en) * | 1979-01-25 | 1980-07-31 | Schering Ag | METHOD FOR EVAPORATION AND, IF NECESSARY, RECOVERY OF WATER FROM AQUEOUS SOLUTIONS |
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| CN204100672U (en) * | 2014-10-17 | 2015-01-14 | 山东齐鲁石化工程有限公司 | Refrigeration system refrigerant recovery system |
| CN105272807A (en) * | 2015-02-14 | 2016-01-27 | 陕西延长石油（集团）有限责任公司延安石油化工厂 | Multi-loop condensation technology for recovery of propylene in polypropylene device tail gas |
| CN104826445B (en) * | 2015-05-15 | 2017-05-03 | 大连理工大学 | Separating process for recycling start-up tail gas of ethylene compression refrigerating system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205672596U (en) * | 2016-06-21 | 2016-11-09 | 北京石油化工工程有限公司 | The piece-rate system of efficient recovery propylene in refrigeration station fixed gas discharge process |
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