CN105861054B - Method for preventing or delaying salt deposition of delayed coking fractionating tower - Google Patents
Method for preventing or delaying salt deposition of delayed coking fractionating tower Download PDFInfo
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- CN105861054B CN105861054B CN201510035865.6A CN201510035865A CN105861054B CN 105861054 B CN105861054 B CN 105861054B CN 201510035865 A CN201510035865 A CN 201510035865A CN 105861054 B CN105861054 B CN 105861054B
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- 238000004939 coking Methods 0.000 title claims abstract description 114
- 230000003111 delayed effect Effects 0.000 title claims abstract description 84
- 150000003839 salts Chemical class 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000008021 deposition Effects 0.000 title abstract 2
- 239000000571 coke Substances 0.000 claims abstract description 72
- 238000002347 injection Methods 0.000 claims abstract description 27
- 239000007924 injection Substances 0.000 claims abstract description 27
- 239000002283 diesel fuel Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 238000010791 quenching Methods 0.000 claims description 29
- 238000004508 fractional distillation Methods 0.000 claims description 28
- 230000000171 quenching effect Effects 0.000 claims description 24
- 239000003921 oil Substances 0.000 abstract description 142
- 239000003502 gasoline Substances 0.000 abstract description 2
- 239000010724 circulating oil Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 82
- 206010039509 Scab Diseases 0.000 description 40
- 230000000694 effects Effects 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000001816 cooling Methods 0.000 description 9
- 230000015271 coagulation Effects 0.000 description 8
- 238000005345 coagulation Methods 0.000 description 8
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- KWIUHFFTVRNATP-UHFFFAOYSA-N glycine betaine Chemical compound C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000003610 charcoal Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 229960003237 betaine Drugs 0.000 description 2
- 238000004523 catalytic cracking Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 238000011033 desalting Methods 0.000 description 2
- 238000005194 fractionation Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 241000772415 Neovison vison Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000009881 electrostatic interaction Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000002010 green coke Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000004227 thermal cracking Methods 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
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- Coke Industry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention provides a method for preventing or slowing down salt deposition of a delayed coking fractionating tower, which takes one or a mixture of more of circulating oil, a coking gasoline fraction and a light diesel oil fraction at the top of the coking fractionating tower as specific distillate oil, and injects the specific distillate oil into a large oil-gas pipeline at the top of a coke tower through a first injection port so as to reduce the temperature of coking oil gas in the large oil-gas pipeline at the top of the coke tower; or/and injecting specific distillate oil into the large oil-gas pipeline at the top of the coke tower through a second injection port, wherein the specific distillate oil is mixed with the coking oil gas and then enters the delayed coking fractionating tower as the feed of the delayed coking fractionating tower.
Description
Technical field
It is more particularly to a kind of to prevent or slow down delayed coker fractionator salt crust the present invention relates to a kind of delayed coking method
Method.
Background technology
Delayed coking is a kind of oil secondary operation technology, is referred to using the mink cell focus of poor hydrogen as raw material, in high temperature (about 500
DEG C) under carry out the thermal cracking and condensation reaction of depth, production gas, gasoline, diesel oil, the technology of wax oil and coke.So-called delay
Coking refers to coking raw material (feedstock oil and recycle oil) being brought rapidly up to pyrogenetic reaction temperature by heating stove heat, quickly enters
Enter in coke drum, the not green coke in furnace tubing, and pyrogenetic reaction is carried out again into coke drum, therefore have delayed-action, be referred to as prolonging
Slow coking technology.
As the change weight of crude oil, and society are continuously increased to light-end products demand, heavy oil residual oil delayed coking skill
Art is more exposed to the concern of people.The atoms such as S, N, O, Cl, H in delayed coking unit feed residue add through coking heater
Heat, N is generated after coking reaction in coke drum2、NH3、H2S and HCl etc..Gaseous NH3With HCl with coke drum tower top oil gas
Into fractionating column.With rising of the oil gas in fractionating column, temperature also by high step-down, when temperature is down to 330 DEG C or so, has again
NH4Cl is generated.NH4Cl is carried to top tower tray with superfine small particle by oil gas, when steam temperature is less than its dew point temperature in tower
When spending, condensation will be produced, so as to form NH4The Cl aqueous solution, and will be gradually concentrated during being flowed down with interior backflow, with iron
Rust, coke powder, drain sludge etc. deposit be bonded in tower tray, downspout, submerged soil etc. together, cause salt coagulation of fractionating tower.
Domestic result of study shows that the salt in coking raw material can not possibly all take off under current electro-desalting level
Remove, especially it is worthy of note that organochlorine in crude oil by electro-desalting and atmospheric and vacuum distillation except not falling, the nitrogen in raw material
Compound is unlikely thoroughly removed, and this is the internal factor of coking fractional distillation column top salt crust, and the external factor of salt crust is fractionating column
Top temperature is relatively low, and fractionating column top tray temperature is less than saturation temperature corresponding with steam partial pressure, Water vapor condensation Cheng Shui, causes
Salt crust, and it is cumulative, cause production abnormal.
At present, the method for handling coking fractional distillation column salt crust has：
(1) washing is the effective workaround for more effectively solving fractionating column head tower disk salt crust, for fractionating column head tower
Disk salt crust, domestic coking plant and catalytic cracking unit fractionating column are substantially the method using washing process, but this kind of method
It can only be the emergency processing in salt coagulation of fractionating tower, and can not thoroughly eradicate salt crust, after a period of time, fractionating column can also be tied
Salt, it is also necessary to wash again.
(2) drain sump, continuous desalination are followed by increasing top, the salt crust that top is followed in pipeline and fractionating column is dissolved to sulfur-bearing dirt
Acidic water stripping device is delivered in water, the open circuit processing that pipeline betaine is followed at the top of coking fractional distillation column and top is ultimately formed, from work
The measure of salt coagulation of fractionating tower is reduced in skill operation, this method is more complicated.
Such as Zhang Jinxian (the treatment measures oil Refining Technologies of Zhang Jinxian coking tower head tower disk salt crusts and engineering .2009.3
(3)：25-26) think that it is the effective workaround for more effectively solving fractionating column head tower disk salt crust to wash, for fractionating column
Head tower disk salt crust, domestic coking plant and catalytic cracking unit fractionating column is substantially the method using washing process, although water
The details washed is not quite similar, for example, some with deaerated water and some with fresh water etc., but principle and flow are substantially close, but this kind
Method can only be the emergency processing in salt coagulation of fractionating tower, and can not thoroughly eradicate salt crust, and after a period of time, fractionating column can also
Salt crust, it is also necessary to wash again.
(king guest, Fu Qiang, Guo keep delayed coking units top and follow salt crust cause analysis and solution Guangzhou such as king guest etc.
Work, in January, 2013, the 1st phase of volume 41:) by increasing top drain sump, continuous desalination are followed, top is followed in pipeline and fractionating column
Salt crust, which is dissolved in sour water, delivers to acidic water stripping device, ultimately forms at the top of coking fractional distillation column and pipeline betaine is followed on top
Open circuit processing, the measure of salt coagulation of fractionating tower is reduced from technological operation, this method is more complicated.
The content of the invention
In order to solve the above problems, the present invention provides a kind of method for preventing or delaying delayed coker fractionator salt crust, its
Be characterised by, using coking fractional distillation column top recycle oil, coker naphtha, light diesel fuel cut one or more of mixtures as
Specific distillate, the specific distillate is injected in delayed coking top of coke tower main oil gas piping by the first inlet, made
It is quenching medium reducing the coking oil gas temperature in delayed coking top of coke tower main oil gas piping；Or/and by specific cut
Oil is injected in the delay top of coke tower main oil gas piping by the second inlet, the specific distillate and the coking oil gas
Charging after mixing as delayed coker fractionator enters delayed coker fractionator.
The described method for preventing or slowing down delayed coker fractionator salt crust, it is characterised in that specific distillate replaces former
Quenching medium is only injected by first inlet, and the mass percent that specific distillate accounts for coker feedstock is 3-10%.
The described method for preventing or slowing down delayed coker fractionator salt crust, former quenching medium is constant, and specific distillate is only
Injected by second inlet, the mass percent that specific distillate accounts for coker feedstock is 2-9%.
The described method for preventing or slowing down delayed coker fractionator salt crust, first inlet and the second inlet are all
Specific distillate is injected, the quality that the first inlet, the second inlet inject specific distillate accounts for coker feedstock quality percentage
Than being respectively 1-8%, 2-9%.
The described method for preventing or slowing down delayed coker fractionator salt crust, first inlet and the second inlet are all
Specific distillate is injected, the quality that the first inlet, the second inlet inject specific distillate accounts for coker feedstock quality percentage
Than being respectively 2-9%, 1-8%.
The described method for preventing or slowing down delayed coker fractionator salt crust, first inlet and the second inlet are all
Specific distillate is injected, in addition to, specific distillate and former quenching medium are mixed and inject first inlet, the original
The mass percent that quenching medium accounts for coker feedstock is 1-9%.
The described method for preventing or slowing down delayed coker fractionator salt crust, specific distillate only inject by described first
Mouth injection, specific distillate and former quenching medium are mixed and inject first inlet, specific distillate accounts for coker feedstock
Mass percent is 2-9%, and the mass percent that the former quenching medium accounts for coker feedstock is 1-8%, or specific distillate
The mass percent for accounting for coker feedstock is 1-8%, and the mass percent that the former quenching medium accounts for coker feedstock is 2-9%.
The described method for preventing or slowing down delayed coker fractionator salt crust, the specific preferred delayed coking of distillate point
Evaporate tower top recycle oil.
The described method for preventing delayed coker fractionator salt crust, first inlet are located at the top of coke tower
On main oil gas piping and coke drum top is abutted, second inlet is located on the charcoal tower top main oil gas piping and is located at and leans on
One end of nearly delayed coker fractionator.
The described method for preventing or slowing down delayed coker fractionator salt crust, the specific distillate are preferred from institute
State the fraction products of coking fractional distillation column.
Invention effect：Before the invention, coking fractional distillation column occurs salt crust for 3-6 months and blocks up tower once, using the invention
Afterwards, tower phenomenon is blocked up without salt crust occurs within 1.0-2.0 years.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Brief description of the drawings
Fig. 1 is used for the structural representation for preventing or slowing down salt coagulation of fractionating tower of delayed coking unit.
Reference：
1st, coke drum；
2nd, the first inlet；
3rd, top of coke tower main oil gas piping；
4th, the second inlet；
5th, delayed coker fractionator；
6th, coking fractional distillation column top recycle oil drawing pump；
7th, heat exchanger；
8th, circulation branch road is pushed up
Embodiment
The salt for causing delayed coker fractionator top salt crust is mainly NH4Cl, NH4Cl is in delayed coker fractionator oil gas
Concentration is extremely low, is carried under conditions of no aqueous water with superfine small mist particles by oil gas to top tower tray, a part of quilt
Fractionating column is carried out, a part is attracted on tower tray and downspout, is trapped in tower.If there is water on delayed coker fractionator top
Formed, NH4Cl is soluble in water, after moisture evaporation, is concentrated precipitation, forms larger particle, when particle is big to a certain extent
When, it is impossible to tower is carried over, simultaneously because electrostatic interaction is firmly adsorbed on tower tray and downspout, salt crust is ultimately caused and blocks up tower.
Therefore the principle of the present invention is, by increasing the oil gas partial pressure of delayed coker fractionator, to be steamed to reduce delayed coker fractionator water
Qi leel pressure, make the reduction of its dew-point temperature, operation temperature is higher than the dew-point temperature of vapor, so as to ensure there is no water in fractionating column
Generation, superfine small mist particles NH4Cl would not be dissolved in water concentration and separate out, so as to can not form larger particle, most
Avoid eventually or slow down the stifled tower of salt crust.
As shown in figure 1, coking plant includes coke drum 1, delayed coker fractionator 5, top of coke tower main oil gas piping 3.Newly
Fresh feedstock oil is mixed after heat exchange with recycle oil, and delayed coking coke drum is entered after heated stove heat, is occurred in coke drum 1
Pyrogenetic reaction, generates the coking oil gas of high temperature, and the coking oil gas passes through the big Oil/Gas Pipe of top of coke tower through the top exit of coke drum 1
Line 3 enters delayed coker fractionator 5, to increase the oil gas partial pressure of delayed coker fractionator 5, to reduce delayed coker fractionator 5
Interior steam partial pressure, make the reduction of its dew-point temperature, the specific distillate of delayed coker fractionator 5 is led to instead of former quenching medium
To cross the first inlet 2 and inject the top of coke tower main oil gas piping 3, former quenching medium typically uses wax oil, stage casing recycle oil etc.,
The specific distillate mixes including coking fractional distillation column top recycle oil, coker naphtha, the one or more of of light diesel fuel cut
Compound, certain described specific distillate may be from the top recycle oil of the delayed coker fractionator of the present apparatus, as shown in figure 1, institute
It is top recycle oil in fractionating column tower tray through coking fractional distillation column top recycle oil drawing pump 6, heat exchanger 7 to state fractionation tower top circulation
Flow into again in fractionating column tower tray, a top circulation branch road 8, the top circulation branch road 8 and first injection are drawn after the heat exchanger 7
Mouth 2 connects, and coking fractional distillation column top recycle oil enters top of coke tower main oil gas piping 3, first injection by pushing up circulation branch road 8
Mouth 2 is arranged on top of coke tower main oil gas piping 3 and close to the top of the delayed coking coke drum 1, the specific distillate
So that the coking oil gas cooling in the top of coke tower main oil gas piping 3, then specific distillate, coking oil gas are mixed into point
Tower is evaporated, the mass percent that the specific distillate dosage that the first inlet injects accounts for coker feedstock is 3-10%, and coker feedstock is
Fingering enters the charging of delayed coker fractionator.
Except injecting oil gas of the specific distillate instead of former quench oil raising coking fractional distillation column above by the first inlet
Outside partial pressure mode, as shown in figure 1, can also be on the top of coke tower main oil gas piping 3 and close to delayed coker fractionator
Provided with the second inlet 4, the specific distillate for improving delayed coker fractionator oil gas partial pressure is only passed through into the note of the second inlet 4
Enter, the part charging and coking oil gas as fractionating column are mixed into delayed coker fractionator, the spy injected through the second inlet 4
It is 2-9% to determine distillate dosage to account for the mass percent of coker feedstock.
It is certainly not limited to above two embodiment, the method for implanting that the present invention takes has a variety of, and the material of injection has
It is a variety of, such as only specific distillate and former quenching medium are mixed and inject first inlet, the specific distillate accounts for Jiao
The mass percent for changing charging is 1-8%, and the mass percent that the former quenching medium accounts for coker feedstock is 2-9%.Such as
Former quenching medium is injected into first inlet and the specific distillate is injected into second inlet, the former chilling
The mass percent that medium accounts for coker feedstock is 2-9%, and the mass percent that the specific distillate injection accounts for coker feedstock is
2-9%.Such as first inlet and the second inlet all inject specific distillate, the first inlet, the injection of the second inlet
It is respectively 1-8%, 2-9% or 2-9%, 1-8% that the quality of specific distillate, which accounts for coker feedstock mass percent,.
To further describe the present invention, it is that coking fractional distillation column top recycle oil is that optimum embodiment is further to lift specific distillate
Illustrate the present invention.
Embodiment 1, certain delayed coking unit treating capacity are 2,100,000 tons/year, recycle ratio 0.2：1, delayed coking coke drum behaviour
It is 0.18MPa to make pressure, and the temperature that the coking oil gas of generation is reacted in delayed coking coke drum is 450-460 DEG C, coking oil
The delayed coke drum top of gas flows into top of coke tower main oil gas piping, and coking fractional distillation column top recycle oil is noted by the first inlet
Enter in top of coke tower main oil gas piping 3, coking fractional distillation column top recycle oil injection rate is 28-30 ton hours, by top of coke tower
The coking oil gas of main oil gas piping 3 cools to 415-425 DEG C, and its effect is that 18 moonsets of delayed coker fractionator are found knot
Salt phenomenon.
Comparative example 1, certain delayed coking treating capacity are 2,100,000 tons/year, recycle ratio 0.2：1, delay coke drum operation pressure
Power is 0.18MPa, and the temperature of the coking oil gas of reaction generation is 450-460 DEG C in delay coke drum, and the coking oil gas is delayed
Coke drum top flows into top of coke tower main oil gas piping, and wax oil is injected into the big oil gas of top of coke tower with 25-28 ton hours speed
In pipeline, the coking oil gas in top of coke tower main oil gas piping is cooled to 415-425 DEG C, coking oil gas and wax after cooling
For oil as mixed oil and gas injection delayed coker fractionator, its effect is that 3-5 months salt crusts of delayed coker fractionator once, pass through
Washing process.
Embodiment 1 understands that coking fractional distillation column top recycle oil prevents salt coagulation of fractionating tower as quench oil compared with comparative example 1
Effect is more preferable than wax oil effect, but embodiment 1 only injects coking fractional distillation column top recycle oil, the coking point by the first inlet
It is 8.9-9.5% to evaporate tower top recycle oil to account for the mass percent of coker feedstock.
Embodiment 2, certain delayed coking unit treating capacity are 1,600,000 tons/year, and Outlet Temperature in Delayed Coking Furnace is 500 DEG C, burnt
Charcoal tower operating pressure is 0.16MPa, recycle ratio 0.3：1, the temperature of the coking oil gas of the interior reaction generation of coke drum is 445-455
DEG C, the coking oil gas flows into top of coke tower main oil gas piping through coke drum top, by coking fractional distillation column top recycle oil with 20-22
In the speed injection top of coke tower main oil gas piping 3 of ton hour, the coking oil gas of top of coke tower main oil gas piping is dropped
Temperature, 420-425 DEG C are reduced to by the oil gas temperature after cooling in the top of coke tower main oil gas piping, now coking fractional distillation column top
The mass percent that recycle oil accounts for coker feedstock is 7.7-8.5%, and its effect is that the delayed coker fractionator does not have for 14 months
It was found that salt crust phenomenon.
Comparative example 2, certain delayed coking unit treating capacity are 1,600,000 tons/year, and Outlet Temperature in Delayed Coking Furnace is 500 DEG C, is prolonged
Slow coking coke drum operating pressure is 0.16MPa, recycle ratio 0.3：1, in coke drum the coking oil gas of reaction generation for 445-
455 DEG C, the coking oil gas flows into top of coke tower main oil gas piping through coke drum top, and quenching medium pair is used as using stage casing recycle oil
High-temperature oil gas in top of coke tower main oil gas piping is cooled, and injection rate is 18-20 ton hours, and its effect is coking fractionation
4-6 months salt crusts of tower once, pass through washing process.
Embodiment 2 is identical external condition with comparative example 2, and coking fractional distillation column top recycle oil is than stage casing recycle oil as anxious
Cold oil prevents that salt coagulation of fractionating tower effect is good, and embodiment 1 is different external conditions from embodiment 2, i.e., delayed coking unit treating capacity,
Coke drum operating pressure, recycle ratio, the temperature of coking oil gas are different from, but the coking fractional distillation column top injected through the first inlet
The anti-salt crust effect that recycle oil reaches all it is obvious that explanation injection coking fractional distillation column top recycle oil come prevent salt crust positive effect and
It is stable.
Embodiment 3 certain delayed coking treating capacity is 1,200,000 tons/year, and coke drum operating pressure is 0.15MPa, recycle ratio
0.15：1, the temperature of the coking oil gas of the interior reaction generation of coke drum is 440-450 DEG C, and the coking oil gas is through coke drum top stream
Enter top of coke tower main oil gas piping, injected with stage casing recycle oil by the first inlet in top of coke tower main oil gas piping, injection
Measure as 9.0-11 ton hours, the coking oil gas in top of coke tower main oil gas piping is cooled, coking oil gas temperature after cooling down
Spend for 415-420 DEG C, before the coking oil gas after cooling enters delayed coker fractionator, coking fractional distillation column top recycle oil is passed through
In second inlet injection top of coke tower main oil gas piping, the injection rate of coking top recycle oil is 8 ton hours, and its effect is burnt
Change fractionating column 2 years without salt crust phenomenon is found, the embodiment 3 is constant using the original quench oil of industry, and only with
Coking fractional distillation column top recycle oil is mixed in fractionating column charging, the amount of injection top recycle oil accounts for the 4.6% of coker feedstock amount.
Comparative example 3：Certain delayed coking treating capacity is 1,200,000 tons/year, and coke drum operating pressure is 0.15MPa, in coke drum
The coking oil gas temperature of reaction generation is 440-450 DEG C, recycle ratio 0.15：1, focused using stage casing recycle oil as quenching medium
High-temperature oil gas in charcoal tower top main oil gas piping is cooled, and stage casing recycle oil injection rate is 9.0-11 ton hours, after cooling
The coking oil gas temperature is reduced to 415-420 DEG C, and its effect is, 4-6 months salt crusts of coking fractional distillation column once, at washing
Reason.
Embodiment 4 certain delayed coking treating capacity is 1,200,000 tons/year, and coke drum operating pressure is 0.15MPa, recycle ratio
0.15：1, the temperature of the coking oil gas of the interior reaction generation of coke drum is 440-450 DEG C, and the coking oil gas is through coke drum top stream
Enter top of coke tower main oil gas piping, pass through the first injection using the miscella of stage casing recycle oil and tower top recycle oil as quenching medium
In mouth injection top of coke tower main oil gas piping, the injection rate of quenching medium is 9.0-11 ton hours, wherein coking top recycle oil
Injection rate be 5.5 ton hours, the injection rate of stage casing recycle oil is 4-6 ton hours, by top of coke tower main oil gas piping
Coking oil gas cools, and coking oil gas temperature is 415-420 DEG C after cooling down, and the coking oil gas after cooling enters delayed coking
Before fractionating column, coking top recycle oil is injected into mixed oil and gas by the second inlet and enters fractionating column, part coking top circulation
The injection rate of oil is 2.5 ton hours, and effect is coking fractional distillation column 2 years without discovery salt crust phenomenon.
Existing quench oil injection rate and species are constant at present for industry for the embodiment of embodiment 3, into delayed coking
The part top recycle oil injection for again fractionating out delayed coker fractionator before fractionating column, is mixed laggard with the coking oil gas after cooling
Enter delayed coker fractionator, by increasing the oil gas partial pressure of delayed coker fractionator, to reduce delayed coker fractionator vapor
Partial pressure so that vapor dew-point temperature is relatively low, is certainly not limited to the method described in embodiment 3, such as described in embodiment 4
Method, i.e., former quench oil are replaced using the specific distillate in part, can also obtain preferable effect.
Certainly, the present invention can also have other various embodiments, ripe in the case of without departing substantially from spirit of the invention and its essence
Know those skilled in the art when can be made according to the present invention it is various it is corresponding change and deformation, but these corresponding change and become
Shape should all belong to the protection domain of appended claims of the invention.
Claims (9)
- A kind of 1. method for preventing or slowing down delayed coker fractionator salt crust, it is characterised in that by coking fractional distillation column top recycle oil, Coker naphtha, one or more of mixtures of light diesel fuel cut lead to the specific distillate as specific distillate Cross in the first inlet injection delay top of coke tower main oil gas piping, as quenching medium, to reduce the big oil gas of top of coke tower The temperature of coking oil gas in pipeline；Or/and specific distillate is injected into the big oil gas of top of coke tower by the second inlet In pipeline, the specific distillate as the charging of delayed coker fractionator enters delayed coking after being mixed with the coking oil gas Fractionating column, first inlet are located on the top of coke tower main oil gas piping and abut coke drum top, second note Entrance is on the top of coke tower main oil gas piping and positioned at close to one end of delayed coker fractionator.
- 2. the method as claimed in claim 1 for preventing or slowing down delayed coker fractionator salt crust, it is characterised in that specific cut Oil replaces former quenching medium only to be injected by first inlet, and the mass percent that specific distillate accounts for coker feedstock is 3-10%.
- 3. the method as claimed in claim 1 for preventing or slowing down delayed coker fractionator salt crust, it is characterised in that former chilling is situated between Matter is constant, and specific distillate is only injected by second inlet, and the mass percent that specific distillate accounts for coker feedstock is 2-9%.
- 4. the method as claimed in claim 1 for preventing or slowing down delayed coker fractionator salt crust, it is characterised in that described first Inlet and the second inlet all inject specific distillate, and the first inlet, the second inlet inject the matter of specific distillate It is respectively 1-8%, 2-9% that amount, which accounts for coker feedstock mass percent,.
- 5. the method as claimed in claim 1 for preventing or slowing down delayed coker fractionator salt crust, it is characterised in that described first Inlet and the second inlet all inject specific distillate, and the first inlet, the second inlet inject the matter of specific distillate It is respectively 2-9%, 1-8% that amount, which accounts for coker feedstock mass percent,.
- 6. the method for preventing or slowing down delayed coker fractionator salt crust as described in claim 4 or 5, it is characterised in that also wrap Include, specific distillate and former quenching medium are mixed and inject first inlet, the former quenching medium accounts for coker feedstock Mass percent is 1-9%.
- 7. the method as claimed in claim 1 for preventing or slowing down delayed coker fractionator salt crust, it is characterised in that specific cut Oil is only injected by first inlet, and specific distillate and former quenching medium are mixed and inject first inlet, special It is 2-9% to determine distillate to account for the mass percent of coker feedstock, and the mass percent that the former quenching medium accounts for coker feedstock is 1-8%, or specific distillate account for coker feedstock mass percent be 1-8%, the former quenching medium accounts for coker feedstock Mass percent is 2-9%.
- 8. the method as claimed in claim 1 for preventing or slowing down delayed coker fractionator salt crust, it is characterised in that described specific The preferred delayed coker fractionator top recycle oil of distillate.
- 9. the method as claimed in claim 1 for preventing or slowing down delayed coker fractionator salt crust, it is characterised in that described specific Distillate is preferred from the fraction products of the coking fractional distillation column.
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| CN201510035865.6A CN105861054B (en) | 2015-01-23 | 2015-01-23 | Method for preventing or delaying salt deposition of delayed coking fractionating tower |
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| US2162933A (en) * | 1937-08-23 | 1939-06-20 | Socony Vacuum Oil Co Inc | Method of protecting condenser tubes and the like from corrosion or salt deposition |
| CN102703114A (en) * | 2012-05-28 | 2012-10-03 | 李小燕 | Method for preventing fractionating tower from salt deposition |
| CN103194258A (en) * | 2013-04-19 | 2013-07-10 | 华东理工大学 | Method for prolonging operation period of circulation oil system on top of fractionation tower |
| CN204039340U (en) * | 2014-07-11 | 2014-12-24 | 中国石油天然气集团公司 | System is followed on a kind of coking fractional distillation column top |
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| US2162933A (en) * | 1937-08-23 | 1939-06-20 | Socony Vacuum Oil Co Inc | Method of protecting condenser tubes and the like from corrosion or salt deposition |
| CN102703114A (en) * | 2012-05-28 | 2012-10-03 | 李小燕 | Method for preventing fractionating tower from salt deposition |
| CN103194258A (en) * | 2013-04-19 | 2013-07-10 | 华东理工大学 | Method for prolonging operation period of circulation oil system on top of fractionation tower |
| CN204039340U (en) * | 2014-07-11 | 2014-12-24 | 中国石油天然气集团公司 | System is followed on a kind of coking fractional distillation column top |
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