CN104449827B - A kind of system and method reducing ethylene unit quench oil viscosity - Google Patents
A kind of system and method reducing ethylene unit quench oil viscosity Download PDFInfo
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- CN104449827B CN104449827B CN201310419168.1A CN201310419168A CN104449827B CN 104449827 B CN104449827 B CN 104449827B CN 201310419168 A CN201310419168 A CN 201310419168A CN 104449827 B CN104449827 B CN 104449827B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G21/00—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents
- C10G21/28—Recovery of used solvent
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention discloses a kind of system and method reducing ethylene unit quench oil viscosity, described system includes: extraction tower, solvent recovery tower and heat exchanger.Method includes: obtain visbreaking quench oil from the quench oil bottom oil scrubber through extracting and recovery；Wherein, extracting overhead stream and circulating solvent heat exchange reduce energy consumption.In the present invention, quench oil removes asphalitine therein by solvent extraction, circulating solvent and visbreaking quench oil is obtained again through recovery, visbreaking quench oil returns ethylene unit chilling system, circulating solvent returns extraction tower recycling, visbreaking intrasystem hot and cold stream stock will be extracted by heat exchange while reducing quench oil viscosity and implement energy exchange, reduce visbreaking system energy consumption.
Description
Technical field
The present invention relates to ethylene production field, furtherly, relate to a kind of ethylene unit quench oil that reduces and glue
The system and method for degree.
Background technology
At present, in the world main ethylene unit use steam heat cracking technology produce ethylene, propylene, butadiene,
The basic organic chemical raw materials such as aromatic hydrocarbons.The raw materials such as lighter hydrocarbons, Petroleum, hydrogenation tail oil and a certain proportion of dilution
There is cracking reaction in steam in industrial pyrolysis furnace under hot conditions, pyrolysis product is through over-quenching, pressure
The operation final production such as contracting, separation go out the industrial chemicals such as ethylene, propylene, butadiene.
Chilling system is an important component part of ethylene unit, by quencher, oil scrubber, water scrubber etc.
Equipment forms, and carries separating and cracking gasoline, diesel oil, the task of fuel oil component, is also to reclaim heat
Key equipment.As the first operation of cracking of ethylene gas disposal, it usually becomes restriction ethylene unit yield
And the bottleneck of operating steadily in the long term, it runs quality to ethylene unit performance important.
The cracking gas that the outlet of Furnace of Ethylene Cracking Plant waste heat boiler comes send after quench oil spraying cooling at quencher
Entering bottom oil scrubber, after reflux cooling, the heavy component in pyrolysis product coagulates and is incorporated in quench oil at the bottom of tower.Split
Light component in hydrolysis products, from oil scrubber Base top contact, enters water scrubber and continues cool to about 40 DEG C, enter
Follow-up compression piece-rate system.Most of dilution steam generation required for cracking derives from the internal quench oil of device
UTILIZATION OF VESIDUAL HEAT IN, insufficient section is supplemented by pipe network steam.Oil wash column bottom temperature is the highest, steam generation the most,
It is the best that device by utilizing waste heat utilizes, and outer benefit steam consumption is the fewest.Therefore the height of oil wash column bottom temperature directly determines remaining
The size of recuperation of heat amount, also affects device production cost.In chilling system, quench oil is at quencher and oil scrubber
Constantly circulating between still, its circulating load often reaches thousand of tphs, and the extraction of oil product only has tens tons
Per hour, quench oil is caused to be detained for a long time in system.Due in pyrolysis product quench oil containing styrene,
The unsaturated aromatic hydrocarbon components such as indenes, the circulation under long high temperature of these materials can be polymerized, and generates big point
Sub-material, causes quench oil viscosity to increase, and makes quench oil moving situation deteriorate, affects heat transfer effect.Due to
Cannot be improved by quench oil viscosity influence oil wash column bottom temperature, cause quench oil heat recovery incomplete, cause
Dilution steam generation generating capacity wretched insufficiency, it is therefore desirable to a large amount of steam fill into system, cause energy waste.With
Time due to quench oil viscosity increase, add the power of system circulating pump, cause plant energy consumption remain high.
Quench oil as the important heat transfer medium of ethylene unit, the rising of its viscosity can directly influence pyrolysis furnace,
, even there is quench oil blood circulation pipeline in gasoline splitter and the normal operating of dilution steam generation generation system
With equipment blocking accident.Control quench oil viscosity in ethylene unit long period high load capacity stable operation and energy-conservation fall
Very important effect is played in consumption.
Traditional process for reducing viscosity is to add quenched flux oil (pyrolysis gas oil) to reduce viscosity.Pyrolysis gas oil blends
To quench oil, though the effect reducing quench oil viscosity can be played, but there is also weak point.First, meeting
Increase pyrolysis gas oil circulating load in oil scrubber, the gas phase load in the middle part of increasing oil scrubber tower reactor to tower, phase
Reduce the disposal ability of oil scrubber with answering；Secondly, containing substantial amounts of styrene, naphthalene, indenes in pyrolysis gas oil
Etc. component, when they circulate along with quench oil, it may occur that polyreaction produces polymer, and accumulates in oil
Wash on column plate or the filler of tower, affect column plate and the heat transfer of filler and mass transfer effect, make tower pressure reduction increase, tower
Disposal ability decline；Again, due to the increase of pyrolysis gas oil circulating load, the drippolene of tower top and tower reactor
The Pyrolysis fuel oil PFO of extraction can have influence on the quality of drippolene and fuel oil containing the component of part diesel oil,
The operation of follow-up quenching water column can be made to deteriorate time serious；Finally, due to the amount of quench oil is very big, therefore it is
Reduction chilling oil viscosity, it usually needs mix substantial amounts of pyrolysis gas oil, and the time injected is longer, no
Then visbreaking effect is poor.
Viscosity reductant is that research department and ethylene patent business worked out various applicable reduction chilling both at home and abroad in recent years
The chemical agent of oil viscosity, realizes visbreaking by the activity adding chemical assistant suppression polyreaction free radical
Target.Chinese patent CN101062880A proposes one and is made up of polymerization inhibitor, dispersant and matal deactivator
Reduce viscosity agent, have suppression polymerization, prevent assemble and the effect of passivating metallic surfaces, reduce chilling
The corrosion of system equipment and fouling, addition is few, and has good stability, will not produce profit breast
The side effect changed.Add viscosity reductant and do not change quench oil composition, it is impossible to fundamentally solve quench oil viscosity
High problem.
Visbreaking tower visbreaking principle is, from the quench oil of quenching oil circulation pump outlet, in the control of temperature control valve (TCV)
Under system, the ethane cracking gas come with Control for Pyrolysis Furnace Area contacts in nozzle mixer, the light component quilt in quench oil
Vaporization, enters visbreaking tower with cracking gas.Visbreaking tower is made up of two sections, and epimere is that a whirlwind divides
From device, hypomere is a free-falling district.After mixed material enters visbreaking tower, first in cyclone separator
Carrying out the separation of liquid phase, in ethane cracking gas and quench oil, the light component of vaporization enters from visbreaking tower tower top
Oil scrubber tower reactor, unboiled heavy liquid phase component is passed through hypomere, is entered visbreaking tower tower reactor, (split as side-product
Solve fuel oil) export tank field.So, fractionate out from quench oil selectively containing a large amount of colloids and drip
The heavier feeds of blue or green matter and light material is stayed in systems, make the light components concentration in circulation quench oil increase
Add, thus reduce quench oil viscosity.Utilize ethane outlet of still cracking gas or directly use the steam stripped side of steam heat
Formula, returns in blood circulation by the light component in quench oil being stripped, utilizes and increase quench oil cyclic system
The oil that in system, light oil dilution proportion viscosity is high realizes visbreaking, to ensure system stable operation.
The weak point of the method is: one is that ethane stove must use high compressed steam air stripping when burning, and gas phase is direct
Returning quenching oil column, quenching oil column load is high；Two is that to send light constituent content in heavy fuel oil outside less after stripping,
Send pipeline outside and be susceptible to blocking.From the point of view of the condition of production of each set ethylene unit, only part ethylene unit
Reduce viscosity tower normal operation also reaches certain visbreaking effect.Owing to visbreaking system is run abnormal, greatly
There is bigger gap in the actual motion index of partial devices quench oil system and original design value, becomes restriction and produce
The bottleneck of ability.Use the steam stripped process for reducing viscosity of water vapour owing to heavy fuel oil is at visbreaking tower in practical operation
Still blocking is the most all not normally functioning.
Oil scrubber sent into after cooling by the cracking gas that Chinese patent CN101074184 proposes pyrolysis furnace outlet comes
Bottom, carries out material separation, forms three bursts of backflows；After cooling, part returns oil scrubber to quench oil at the bottom of tower,
Part is sent outside；After cooling, part returns oil scrubber to stage casing dish oil, and part is blended into making adjustments viscosity at the bottom of tower,
Part is sent outside；Overhead reflux gasoline enters through pipeline, system after pyrolysis furnace is sent into after carrying out logistics cooling the most at last.
This method only optimizes oil scrubber Temperature Distribution, does not change quench oil composition, to reducing viscosity effect
Not quite, and increase oil scrubber stage casing load, affect production capacity.
Though said method can partly play the effect reducing quench oil viscosity, but cannot fundamentally solve chilling
The problem that oil viscosity is high.It is not reasonable all to there is the design of Reduce viscosity system in current domestic a lot of ethylene units,
Quench oil viscosity is high, and quenching oil column tower top temperature is higher, bottom temperature is on the low side, and Reduce viscosity system is run
Instability, the problems such as heat recovery efficiency is low, chilled water (chw) emulsifying often.Quench oil is ensured from technological design
System is made up of and operating condition suitable material, to irrational visbreaking technique corrective measure to be taked, is
The key point of guarantee system continuous and steady operation.
Summary of the invention
For solving produced problem in prior art, the invention provides a kind of ethylene unit quench oil that reduces and glue
The system and method for degree.Quench oil removes asphalitine therein by solvent extraction, then is subtracted through recovery
Viscous quench oil, the hot and cold stream stock that will be produced during extracting visbreaking by heat exchange while reducing quench oil viscosity
Implement energy exchange, reduce energy consumption.
An object of the present invention is to provide a kind of system reducing ethylene unit quench oil viscosity.
Described system includes: extraction tower, heat exchanger and solvent recovery tower, extraction tower is provided with quench oil and enters
Material mouth and solvent feed mouth, extraction tower top connects in the middle part of solvent recovery tower after connecting heat exchanger heated side, molten
Agent recovery tower top connects the solvent feed mouth of extraction tower after connecting heat exchanger cold side.
The two of the purpose of the present invention are to provide a kind of method reducing ethylene unit quench oil viscosity.
Including:
Visbreaking quench oil is obtained through extracting and recovery from the quench oil bottom oil scrubber；Extract overhead stream and follow
Ring solvent heat exchange reduces energy consumption.
Comprise the following steps:
(1) solvent extraction: draw one quench oil from ethylene unit chilling system, utilizes molten in extraction tower
Extracting is implemented in agent, and tower top is isolated extract oil, isolated raffinate Colophonium at the bottom of tower；
(2) solvent recovery: the extract oil obtained from step (1), enters solvent after blood pressure lowering and/or intensification
Recovery tower, isolated circulating solvent and visbreaking quench oil, visbreaking quench oil returns ethylene unit chilling system,
Circulating solvent returns extraction tower recycling.
In described solvent extraction step, solvent is 0.01-20, preferably 0.5-5 with the weight ratio of quench oil；
Described solvent is the one in C2-C6 alkane or alkene or its mixture；It is preferably C3-C5
One in alkane or its mixture.
Described quench oil is the oil distillate of oil scrubber tower reactor in ethylene unit chilling system, and its typical composition is
Polycyclic aromatic hydrocarbon, colloid, asphalitine.Described ethylene unit mainly by industrial pyrolysis furnace and chilling, compression,
The systems such as separation are constituted, and chilling system mainly includes quencher, oil scrubber, water scrubber.
Described extraction tower pressure is 1MPa-10MPa, and the temperature of extraction tower is 30 DEG C-230 DEG C；
The pressure of described solvent recovery tower is 0.1MPa-10Mpa；The temperature range of solvent recovery tower is
30℃-300℃。
Specifically can be by the following technical solutions:
Solvent enters from the solvent feed mouth of extraction tower, draws the pressurization of one quench oil from ethylene unit chilling system
After enter from the quench oil charging aperture of extraction tower, solvent and quench oil are implemented to extract in extraction tower, obtain
The extract oil extract oil outlet from extraction tower top is drawn, the raffinate Colophonium obtained Colophonium bottom extraction tower
Matter outlet is drawn.Extract oil reduces pressure through air relief valve, owing to throttling expansion operative temperature declines, then warp
Heat exchanger by the circulating solvent heat exchange after pressurizeing, rise high-temperature laggard enter solvent recovery tower import.Extract oil exists
Being separated into solvent and visbreaking quench oil in solvent recovery tower, solvent is drawn from tower top, and visbreaking quench oil is from the bottom of tower
Draw.
The logical solvent recycle compressor that enters of the solvent drawn by solvent recovery tower increases pressure, and temperature raises simultaneously.
The solvent of high temperature enters heat exchanger and is heated by extract oil, simultaneously oneself cooling.The most condensed device of solvent of cooling
Condensation, after mixing in blender with supplementing solvent, the solvent as extraction tower enters extraction tower solvent again
Charging aperture.
The visbreaking quench oil drawn from solvent recovery tower is adjusted to the temperature close with ethylene unit quench oil and pressure
Return chilling system after power, thus reduce overall quench oil viscosity.
The present invention utilizes solvent extraction technology to reduce quench oil viscosity, and by heat exchanger by quench oil solvent
Extracting visbreaking intrasystem hot and cold stream stock carries out energy exchange, reduces heating and cooling energy, for visbreaking system
System is energy-saving and cost-reducing.
Accompanying drawing explanation
The system schematic of Fig. 1 present invention
Description of reference numerals:
1 extraction tower, 2 air relief valve A, 3 air relief valve B, 4 heat exchangers, 5 solvent recovery towers, 6 coolers, 7
Solvent recycle compressor, 8 condensers, 9 blenders.
Detailed description of the invention
Below in conjunction with embodiment, further illustrate the present invention.
11008mPa.s when chilling oil viscosity used is normal pressure 50 DEG C in embodiment, quench oil mid-boiling point is higher than
The component of 629 DEG C accounts for the 33% of gross weight.
Embodiment 1:
As it is shown in figure 1, a kind of system reducing ethylene unit quench oil viscosity, including: extraction tower 1, heat exchange
Device 4 and solvent recovery tower 5.Quench oil charging aperture and solvent feed mouth, extraction tower 1 it is provided with on extraction tower 1
Top connects in the middle part of solvent recovery tower after connecting heat exchanger 4 heated side, and solvent recovery tower 5 top connects heat exchange
The solvent feed mouth of extraction tower 1 is connected after device 4 cold side.
For solvent, quench oil carried out solvent extraction visbreaking process with propane.Quench oil feeding temperature is 70 DEG C,
Pressure is 5MPa, flow 10t/h.Solvent feed temperature is 70 DEG C, and pressure is 5MPa, flow 10t/h,
Solvent and quench oil weight ratio are 1.The solvent of quench oil and its weight 0.05 enters from extraction tower top, its
Remaining solvent is entered by extraction tower bottom.Extraction tower temperature is 70 DEG C, and pressure is 5MPa.Extraction tower tower top separates
Go out extract oil, at the bottom of tower, isolate raffinate Colophonium.After Colophonium is depressurized to 0.8MPa normal pressure desolvation mutually, as
Fuel oil extraction.
By throttling expansion, the extract oil that extraction tower tower top flows out is depressurized to 0.8MPa, and temperature decreases to
20.7 DEG C, adjust temperature to after 70 DEG C by heat exchanger, send in the middle part of solvent recovery tower.Solvent recovery tower is
Void tower, this pressure tower 0.8MPa, in tower, uniformity of temperature profile is 70 DEG C.Now solvent density declines to a great extent,
Solvability declines, thus realizes solvent and visbreaking chilling oil separating.Subtracted from the bottom of solvent recovery tower tower
Viscous quench oil 3717kg/h, viscosity is 9mPa.s.The solvent being recycled from solvent recovery column overhead, by it
Being pressurized to 5Mpa, temperature is upgraded to 166.2 DEG C therewith.The recovered solvent of 166.2 DEG C and the extract oil of 20.7 DEG C
Stream stock carries out heat exchange in heat exchanger；The relatively light oil phase temperature of heat exchanger exit is 70 DEG C, and recycling design is lowered the temperature
To 100.1 degrees Celsius.Utilize visbreaking system self hot and cold stream stock heat to couple by heat exchanger, save
The additional heat of 711kW and additional amount of cooling water.
Embodiment 2:
System is with embodiment 1.
For solvent, quench oil carried out solvent extraction visbreaking process with propane.Quench oil feeding temperature is 70 DEG C,
Pressure is 5MPa, flow 10t/h.Solvent feed temperature is 70 DEG C, and pressure is 5MPa, flow 200t/h,
Solvent and quench oil weight ratio are 20.The solvent of quench oil and its weight 0.05 enters from extraction tower top, its
Remaining solvent is entered by extraction tower bottom.Extraction tower temperature is 70 DEG C, and pressure is 5MPa.Extraction tower tower top separates
Go out extract oil, at the bottom of tower, isolate raffinate Colophonium.After Colophonium is depressurized to 0.8MPa normal pressure desolvation mutually, as
Fuel oil extraction.
By throttling expansion, the extract oil that extraction tower tower top flows out is depressurized to 0.8MPa, and temperature decreases to
18.6 DEG C, adjust temperature to after 70 DEG C by heat exchanger, send in the middle part of solvent recovery tower.Solvent recovery tower is
Void tower, this pressure tower 0.8MPa, in tower, uniformity of temperature profile is 70 DEG C.Now solvent density declines to a great extent,
Solvability declines, thus realizes solvent and visbreaking chilling oil separating.Subtracted from the bottom of solvent recovery tower tower
Viscous quench oil 6360kg/h, viscosity is 31mPa.s.The solvent being recycled from solvent recovery column overhead, by it
Being pressurized to 5Mpa, temperature is upgraded to 166.2 DEG C therewith.The recovered solvent of 166.2 DEG C and the extract oil of 18.6 DEG C
Stream stock carries out heat exchange in heat exchanger；The extract oil temperature of heat exchanger exit is 70 DEG C, and recycling design cools to
100.0 degree Celsius.Utilize visbreaking system self hot and cold stream stock heat to couple by heat exchanger, save 16MW
Additional heat and additional amount of cooling water.
Comparative example:
Existing visbreaking tower technique for draw one quench oil from ethylene unit quench oil blood circulation, its temperature
Being 195 DEG C, pressure is 0.16MPa.Ethane stove cracking gas temperature is 500 DEG C, and pressure is 0.16MPa.Should
Quench oil and ethane stove cracking gas are mixed into visbreaking tower, and visbreaking tower pressure is 0.16MPa, and temperature is 272 DEG C,
Tower top isolated visbreaking quench oil, isolates heavy fuel oil at the bottom of tower.(viscosity is the visbreaking quench oil of 272 DEG C
65mm2/ s) enter oil scrubber bottom.Existing method have lost the high-grade heat energy of ethane stove cracking gas, also will
It is brought in chilling system.
Claims (6)
1. the system reducing ethylene unit quench oil viscosity, it is characterised in that:
Described system includes: extraction tower, heat exchanger and solvent recovery tower, extraction tower is provided with quench oil and enters
Material mouth and solvent feed mouth, extraction tower top connects in the middle part of solvent recovery tower after connecting heat exchanger heated side, molten
Agent recovery tower top connects the solvent feed mouth of extraction tower after connecting heat exchanger cold side.
2. using the method reducing ethylene unit quench oil viscosity of system as claimed in claim 1, it is special
Levy and be that described method includes:
(1) solvent extraction: draw one quench oil from ethylene unit chilling system, utilizes molten in extraction tower
Extracting is implemented in agent, and tower top is isolated extract oil, isolated raffinate Colophonium at the bottom of tower；
(2) solvent recovery: the extract oil obtained from step (1), enters solvent after blood pressure lowering and/or intensification
Recovery tower, isolated circulating solvent and visbreaking quench oil, visbreaking quench oil returns ethylene unit chilling system,
Circulating solvent returns extraction tower recycling；
Described extraction tower pressure is 1MPa-10MPa, and the temperature of extraction tower is 30 DEG C-230 DEG C；Described solvent
It is the one in C2-C6 alkane or alkene or its mixture.
3. the method reducing ethylene unit quench oil viscosity as claimed in claim 2, it is characterised in that:
Solvent is 0.01-20 with the weight ratio of quench oil.
4. the method reducing ethylene unit quench oil viscosity as claimed in claim 3, it is characterised in that:
Solvent is 0.5-5 with the weight ratio of quench oil.
5. the method reducing ethylene unit quench oil viscosity as claimed in claim 2, it is characterised in that:
Described solvent is the one in C3-C5 alkane or its mixture.
6. the method reducing ethylene unit quench oil viscosity as claimed in claim 2, it is characterised in that:
The pressure of described solvent recovery tower is 0.1MPa-10MPa；The temperature range of solvent recovery tower is
30℃-300℃。
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| CN201310419168.1A CN104449827B (en) | 2013-09-13 | 2013-09-13 | A kind of system and method reducing ethylene unit quench oil viscosity |
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| CN201310419168.1A CN104449827B (en) | 2013-09-13 | 2013-09-13 | A kind of system and method reducing ethylene unit quench oil viscosity |
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| CN104449827B true CN104449827B (en) | 2016-12-07 |
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| CN111088063B (en) * | 2018-10-24 | 2021-08-03 | 中国石油化工股份有限公司 | System and method for viscosity reduction |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4428824A (en) * | 1982-09-27 | 1984-01-31 | Mobil Oil Corporation | Process for visbreaking resid deasphaltenes |
| CN1485412A (en) * | 2002-09-28 | 2004-03-31 | 中国石油化工股份有限公司 | Combined technologic process for manufacturing petroleum residue |
| CN102220169A (en) * | 2011-05-10 | 2011-10-19 | 沈阳石蜡化工有限公司 | Pyrolysis gas quenching structural unit of CPP (Catalytic Pyrolysis Production) and process thereof |
-
2013
- 2013-09-13 CN CN201310419168.1A patent/CN104449827B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4428824A (en) * | 1982-09-27 | 1984-01-31 | Mobil Oil Corporation | Process for visbreaking resid deasphaltenes |
| CN1485412A (en) * | 2002-09-28 | 2004-03-31 | 中国石油化工股份有限公司 | Combined technologic process for manufacturing petroleum residue |
| CN102220169A (en) * | 2011-05-10 | 2011-10-19 | 沈阳石蜡化工有限公司 | Pyrolysis gas quenching structural unit of CPP (Catalytic Pyrolysis Production) and process thereof |
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