CN102559237A - Coal-based oil distillation method using thermal condensation inhibited oil - Google Patents
Coal-based oil distillation method using thermal condensation inhibited oil Download PDFInfo
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Abstract
The invention relates to a coal-based oil distillation method using thermal condensation inhibited oil. compound oil F2 of oil logistics F12 from coal-based oil and formed by hydrocarbon with a conventional boiling point higher than 450 DEG C and thermal condensation inhibited oil YJ, and is separated into oil logistics F21 formed by hydrocarbon with a conventional boiling point lower than 520 DEG C and oil logistics F22 formed by hydrocarbon with a conventional boiling point higher than 520 DEG C in a pressure-reduction fractionating column T2 after being heated by a heating furnace, and the fractionating column T2 is operated under a pressure reduction condition. When carbon residue of heavy oil of coal tar is low, the oil logistics F21 is used as a hydrogenation raw material, the thermal condensation inhibited oil serves as a dispersing agent of a coal heavy oil component, a heating medium and a coking inhibitor during heating and the like, and has the effects of inhibiting furnace tube coking of the heating furnace, prolonging the operating cycle, improving the operating temperature of the heating furnace and improving the operation of the fractionating column. In the method of the invention, the hydrogenation material is separated out from the coal heavy oil, the load during heat processing is reduced, and the total liquid yield during coal tar lightening is improved.
Description
Technical field
The present invention relates to a kind of inhibited oil coal-based oily distillating method of thermal condensation that uses; Say especially and the present invention relates to a kind of vacuum distillation method that uses the inhibited oil coal tar heavy oil deep drawing hydrogenating materials of thermal condensation; More particularly the present invention relates to a kind of full cut coal tar and transform combination process; Lighting end and the last running of using the inhibited oil coal tar heavy oil vacuum distillation method of thermal condensation to obtain get into unifining process HT and hot procedure RJG (such as coking or hydrocracking process of suspended bed) respectively; Hot procedure RJG obtains mainly contains conventional boiling point and is lower than 450 ℃ product cut and gets into unifining process HT, and thermal condensation is inhibited oil for being the hydrocarbon ils of 330～520 ℃ unifining fractions consisting by the conventional boiling point of unifining process HT mainly.
Background technology
The dry distillation of coal process that produces at present coal tar is such as the blue charcoal process of coal system, and the gained coal-tar products all contains the coal tar heavy oil (be higher than such as conventional boiling point 450 ℃ coal tar fraction) of some amount.Coal tar heavy oil possesses boiling point height, colloid and asphalt content height, the very easily characteristics of condensation coking of being heated; Fractionation process in routine; There is the Heating temperature higher limit for fear of Pintsch process; Even adopt comprehensive technical measure such as adopt the charging process furnace, in heating furnace tube, inject stripped vapor, underpressure distillation reduces working pressure, use multiple hands such as reduced steam below the vacuum distillation tower opening for feed; Can not realize the target of deep drawing lighter fraction in coal tar heavy fractioning (be such as conventional boiling point 450～520 ℃ coal tar fraction); And wherein potential hydrogenation material component lower when the coal tar heavy oil remaining carbon (be such as conventional boiling point 450～520 ℃ coal tar fraction) will be compelled to have got into hot procedure as the coal heavy oil component; Reduce the overall liquid yield of coal tar lighting process, formed the poor quality utilization of resource.For the coal tar heavy oil of a large amount of low carbon residue content, the problems referred to above form great financial loss.And still do not have at present a distillation separation method that addresses this problem.
Iff is considered the distillation principle, realizes that the target of deep drawing lighter fraction in the coal tar heavy fractioning (be such as conventional boiling point 450～520 ℃ coal tar fraction) is possible, table 1 listed the hydro carbons decompression down the boiling point data supply to analyze and use.
Table 1 hydro carbons decompression boiling point data, unit ℃
To deal with problems in order improving, must to reduce coal tar heavy oil receives thermal process at process furnace thermal condensation coking susceptibility.Test verified; With the conventional boiling point of a certain amount of (being equivalent to more than 15% of coal tar heavy duty weight of oil) is that 330～480 ℃ coal tar hydrorefining oil adds in the coal tar heavy oil; Can significantly reduce mixture process furnace receive thermal process condensation coking susceptibility, prolong heat-up time, improve Heating temperature; Employed thermal condensation is inhibited oil to be " hydrofined oil that conventional boiling point is 330～480 ℃ coal tar fraction ", possesses following characteristics:
1. because of its aromatic hydrocarbon substance that is rich in polynuclear hydrocarbon and fractional saturation possesses the mutual solubility good with coal tar heavy oil, these characteristics have determined it to possess dispersion agent, heat-carrying agent function;
2. because of its aromatic hydrocarbon substance that is rich in fractional saturation possesses good heat-resistant stability and good hydrogen supply capacity, these characteristics have determined it to possess the coking inhibitor function;
3. conveniently be easy to get, easy to implement.
Test-results explanation uses the inhibited oil decompression deep drawing distillation target that can realize coal tar heavy oil of thermal condensation, and the present invention promptly is based on this proposition.
Be processed as example with coalite tar in 500,000 tons of/year blue charcoal devices products; Coalite tar can obtain about 15～20% 7.5～100,000 tons/year conventional boiling point and is higher than 450 ℃ coal tar heavy oil in 500,000 tons/year of the fractionation; It is that the quantity of 450～520 ℃ of coal tar fractions is 1.1～2.0 ten thousand tons/year that this coal tar heavy oil contains 15～20% conventional boiling point; Even isolate half, benefit also is huge.
Be processed as example with coalite tar in 500,000 tons of/year blue charcoal devices products; Conventional boiling point is that 350～480 ℃ cut ratio is about 20% of a coal tar quantity in the hydrofined oil; For using conventional boiling point in the coal tar hydrorefining oil is that 350～480 ℃ cut is made hydrogen supply dissolvent oil and mixed the delayed coking process that is used as coking raw material with coal tar heavy oil; The present invention has reduced coal tar heavy oil quantity 15～20% and has increased hydrogen supply dissolvent oil quantity 10～20% simultaneously; Can significantly reduce the concentration (on original concentration numerical value basis, reducing by 20%) of coal tar heavy oil in the overall raw material of delayed coking unit, significantly improve feedstock property.
The method of the invention is not appeared in the newspapers.
Therefore, first purpose of the present invention is a kind of inhibited oil coal-based oily distillating method of thermal condensation that uses; The present invention's second purpose is to propose a kind of vacuum distillation method that uses the inhibited oil coal tar heavy oil deep drawing hydrogenating materials of thermal condensation; The present invention's the 3rd purpose is to propose a kind of full cut coal tar and transforms combination process; Lighting end and the last running of using the inhibited oil coal tar heavy oil vacuum distillation method of thermal condensation to obtain get into unifining process HT and hot procedure RJG (such as coking or hydrocracking process of suspended bed) respectively; Hot procedure RJG obtains mainly contains conventional boiling point and is lower than 450 ℃ product cut and gets into unifining process HT, and thermal condensation is inhibited oil for being the hydrocarbon ils of 330～520 ℃ unifining fractions consisting by the conventional boiling point of unifining process HT mainly.
Summary of the invention
A kind of inhibited oil coal-based oily distillating method of thermal condensation that uses of the present invention is characterized in that comprising following steps:
1. first fractionating step; At separation column T1, comprise conventional boiling point and be lower than 450 ℃ of hydrocarbon components and conventional boiling point and be higher than separated obtain mainly of the coal-based oily F1 of 450 ℃ of hydrocarbon components and be lower than the oily logistics F11 that 450 ℃ of hydrocarbon form and mainly be higher than the oily logistics F12 that 450 ℃ of hydrocarbon are formed by conventional boiling point by conventional boiling point;
2. heating step, the inhibited oil YJ of oily logistics F12 and thermal condensation mix and obtain high temperature mixing oil F2; The inhibited oil YJ of thermal condensation is that fractional saturation aromatic hydrocarbons and polynuclear hydrocarbon, hydrogen weight content are formed, are rich in to 330～520 ℃ hydrocarbon greater than 10% by conventional boiling point mainly;
3. after-fractionating step, oily logistics F2 is separated into mainly by conventional boiling point at separation column T2 and is lower than the oily logistics F21 that 520 ℃ of hydrocarbon form and mainly is higher than the oily logistics F22 that 520 ℃ of hydrocarbon are formed by conventional boiling point, and separation column T2 operates under reduced pressure.
Operational condition of the present invention is generally:
1. coal-based oily F1 is from coal tar;
2. the inhibited oil YJ of thermal condensation is that 330～520 ℃ hydrocarbon is formed by conventional boiling point mainly, the unifining oil product of the coal tar that to come self-contained conventional boiling point be 330～520 ℃ of cuts, fractional saturation aromatic hydrocarbons weight content greater than 8%, the hydrogen weight content is greater than 10%;
3. separation column T2 working pressure is lower than 0.010MPa (absolute pressure).
Operational condition of the present invention is generally:
1. coal-based oily F1 is from coal tar;
2. the inhibited oil YJ of thermal condensation is that 330～480 ℃ hydrocarbon is formed by conventional boiling point mainly, the unifining oil product of the coal tar that to come self-contained conventional boiling point be 330～480 ℃ of cuts, fractional saturation aromatic hydrocarbons weight content greater than 12%, the hydrogen weight content is greater than 11%;
3. separation column T2 working pressure is lower than 0.005MPa (absolute pressure).
Separation column T2 of the present invention is provided with separation column charging process furnace T2F usually, and the high temperature mixing oil F2 temperature of leaving process furnace T2F is generally 340～385 ℃, is generally 360～375 ℃.
The ratio of the weight rate W2 of thermal condensation inhibited oil YJ weight rate W1 and oily logistics F12 is K=W1/W2 among the high temperature mixing oil F2 of the present invention, and the K value is generally 0.05～3.0, is generally 0.35～1.5.
The coal-based oily F1 source that the present invention is fit to is coalite tar or coal-tar middle oil or its distillate or its mixing oil.
The source of the coal-based oily F1 of the present invention can be coal-tar heavy oil heavy oil or liquefied coal coil heavy oil or its mixing oil.
Embodiment
Below describe the present invention in detail.
Pressure of the present invention refers to absolute pressure.
Concentration of component of the present invention when not specializing, is weight concentration.
Coal-based oil according to the invention refers to the hydrocarbon ils from coal charge that coal hot procedures such as the dry distillation of coal or coal tarization or coal generating gas or DCL/Direct coal liquefaction produce, and comprises semi coking tar, middle temperature tar, high temperature tar, liquefied coal coil and mixing oil thereof.
Coal-based heavy oil according to the invention; Refer to mainly by conventional boiling point and be higher than cut that the coal-based oil ingredient of 450 ℃ or 480 ℃ forms such as common said coal-tar pitch from coal tar; Usually contain a large amount of macromolecular substance such as polycyclic aromatic hydrocarbons, colloid, bituminous matter etc., its hydrogen richness is lower, ash oontent is higher.
Coal-based heavy oil component according to the invention refers to the hydrocarbon ils component that conventional boiling point in the coal-based oil is higher than 450 ℃ or 480 ℃, contains a large amount of macromolecular substance such as polycyclic aromatic hydrocarbons, colloid, bituminous matter etc. usually, and its hydrogen richness is lower.
Coal tar according to the invention refers to the tar that coal hot procedures such as the dry distillation of coal or coal tarization or coal generating gas produce, and comprises semi coking tar, middle temperature tar, high temperature tar and mixing oil thereof.
A kind of inhibited oil coal-based oily distillating method of thermal condensation that uses of the present invention is characterized in that comprising following steps:
1. first fractionating step; At separation column T1, comprise conventional boiling point and be lower than 450 ℃ of hydrocarbon components and conventional boiling point and be higher than separated obtain mainly of the coal-based oily F1 of 450 ℃ of hydrocarbon components and be lower than the oily logistics F11 that 450 ℃ of hydrocarbon form and mainly be higher than the oily logistics F12 that 450 ℃ of hydrocarbon are formed by conventional boiling point by conventional boiling point;
2. heating step, the inhibited oil YJ of oily logistics F12 and thermal condensation mix and obtain high temperature mixing oil F2; The inhibited oil YJ of thermal condensation is that fractional saturation aromatic hydrocarbons and polynuclear hydrocarbon, hydrogen weight content are formed, are rich in to 330～520 ℃ hydrocarbon greater than 10% by conventional boiling point mainly;
3. after-fractionating step, oily logistics F2 is separated into mainly by conventional boiling point at separation column T2 and is lower than the oily logistics F21 that 520 ℃ of hydrocarbon form and mainly is higher than the oily logistics F22 that 520 ℃ of hydrocarbon are formed by conventional boiling point, and separation column T2 operates under reduced pressure.
Operational condition of the present invention is generally:
1. coal-based oily F1 is from coal tar;
2. the inhibited oil YJ of thermal condensation is that 330～520 ℃ hydrocarbon is formed by conventional boiling point mainly, the unifining oil product of the coal tar that to come self-contained conventional boiling point be 330～520 ℃ of cuts, fractional saturation aromatic hydrocarbons weight content greater than 8%, the hydrogen weight content is greater than 10%;
3. separation column T2 working pressure is lower than 0.010MPa (absolute pressure).
Operational condition of the present invention is generally:
1. coal-based oily F1 is from coal tar;
2. the inhibited oil YJ of thermal condensation is that 330～480 ℃ hydrocarbon is formed by conventional boiling point mainly, the unifining oil product of the coal tar that to come self-contained conventional boiling point be 330～480 ℃ of cuts, fractional saturation aromatic hydrocarbons weight content greater than 12%, the hydrogen weight content is greater than 11%;
3. separation column T2 working pressure is lower than 0.005MPa (absolute pressure).
Separation column T2 of the present invention is provided with separation column charging process furnace T2F usually, and the high temperature mixing oil F2 temperature of leaving process furnace T2F is generally 340～385 ℃, is generally 360～375 ℃.
The ratio of the weight rate W2 of thermal condensation inhibited oil YJ weight rate W1 and oily logistics F12 is K=W1/W2 among the high temperature mixing oil F2 of the present invention, and the K value is generally 0.05～3.0, is generally 0.35～1.5.
The coal-based oily F1 source that the present invention is fit to is coalite tar or coal-tar middle oil or its distillate or its mixing oil.
The source of the coal-based oily F1 of the present invention can be coal-tar heavy oil heavy oil or liquefied coal coil heavy oil or its mixing oil.
In order to suppress the thermal condensation of separation column T2 bottom oil product, usually oily logistics F22 is cooled off the back such as returning separation column T2 bottom after being cooled to 180～250 ℃, reduce separation column T2 bottom temp such as being cooled to 250～300 ℃.
Compare with existing coal-based heavy oil fractionation process; The invention has the advantages that: the thermal condensation that use properties is good is inhibited oil, and the coal tar hydrorefining oil such as with conventional boiling point being 330～520 ℃ adds in the coal tar heavy oil; Can significantly reduce mixture receives thermal process at process furnace condensation coking susceptibility; Prolong heat-up time, improve Heating temperature, realize the purpose of deep drawing hydrogenation material.
Embodiment
The coal preparing natural gas process producing coal tar heavy oil of character such as table 2 adopts conventional coal-based heavy oil fractionation process, and the component and the VACUUM TOWER BOTTOM heavy oil that conventional boiling point in the coal tar heavy oil are lower than 456 ℃ are separated extracting rate～80%.Separation column charging process furnace is set, and the furnace outlet temperature is the upper limit with 350 ℃, and vacuum distillation tower pressure 0.0013MPa uses stripped vapor at the bottom of the tower.
Adopt the present invention, the two-step approach fractionation is set, the first step, it is that to be lower than 354 ℃ fraction A and conventional boiling point be to be higher than 354 ℃ fraction B that coal tar heavy oil is separated into conventional boiling point through vacuum distillation tower 1; Second step; The coal tar hydrorefining oil that with conventional boiling point is 330～470 ℃ is as forming mixing oil HY in the inhibited oil adding fraction B of thermal condensation, mixing oil HY gets into vacuum distillation tower 2 through the vacuum distillation tower 2 charging process furnace back of heating up, and the furnace outlet temperature is the upper limit with 370 ℃; In vacuum distillation tower 2; Realize the purpose of deep drawing hydrogenation material, the component and the VACUUM TOWER BOTTOM heavy oil that conventional boiling point in the coal tar heavy oil are lower than 506 ℃ are separated, and vacuum distillation tower 2 tower bed materials are as the delayed coking raw material; Other lighting end is as the coal tar hydrorefining raw material, and coal tar heavy oil TV extracting rate is～90%.Vacuum distillation tower 2 pressure 0.0013MPa use stripped vapor at the bottom of vacuum distillation tower 2 towers.Thermal condensation inhibited oil with coal tar heavy oil in conventional boiling point be that the part by weight of cut more than 350 ℃ is 0.7: 1.0～1.0: 1.0.
With adopt conventional coal-based heavy oil fractionation process, in the coal tar heavy oil conventional boiling point greater than 355 ℃ coal tar fraction volume extracting rate increased～20%, the weight extracting rate equates substantially.
The analysis of table 2 feedstock property
| Project | Coal tar heavy oil | Remarks |
| Density (20 ℃), g/cm 3 | ～1.06 | |
| Boiling range, ℃ | The simulation distil data | |
| IBP/10％ | 61/230 | |
| 30％/50％ | 303/354 | |
| 70％/90％ | 407/506 | |
| 95％/FBP | -/735 | |
| S，m％ | 0.335 | |
| N，m％ | 1.0 | |
| C，m％ | 69.28 | |
| H，m％ | 7.99 | |
| Flash-point (remaining silent), ℃ | ||
| Existent gum, mg/100ml | - | |
| Zero pour, ℃ | ||
| Acidity, mgKOH/100ml | - | |
| Iodine number, gI/100g | - | |
| Viscosity (20 ℃), mm 2/s | - | |
| Ash content, m% | 1.181 | |
| Moisture, m% | 15.5 | |
| 10% carbon residue, m% | 6.51 |
Claims (13)
1. one kind is used the inhibited oil coal-based oily distillating method of thermal condensation, it is characterized in that comprising following steps:
1. first fractionating step; At separation column T1, comprise conventional boiling point and be lower than 450 ℃ of hydrocarbon components and conventional boiling point and be higher than separated obtain mainly of the coal-based oily F1 of 450 ℃ of hydrocarbon components and be lower than the oily logistics F11 that 450 ℃ of hydrocarbon form and mainly be higher than the oily logistics F12 that 450 ℃ of hydrocarbon are formed by conventional boiling point by conventional boiling point;
2. heating step, the inhibited oil YJ of oily logistics F12 and thermal condensation mix and obtain high temperature mixing oil F2; The inhibited oil YJ of thermal condensation is that fractional saturation aromatic hydrocarbons and polynuclear hydrocarbon, hydrogen weight content are formed, are rich in to 330～520 ℃ hydrocarbon greater than 10% by conventional boiling point mainly:
3. after-fractionating step, oily logistics F2 is separated into mainly by conventional boiling point at separation column T2 and is lower than the oily logistics F21 that 520 ℃ of hydrocarbon form and mainly is higher than the oily logistics F22 that 520 ℃ of hydrocarbon are formed by conventional boiling point, and separation column T2 operates under reduced pressure.
2. method according to claim 1 is characterized in that:
1. coal-based oily F1 is from coal tar;
2. the inhibited oil YJ of thermal condensation is that 330～520 ℃ hydrocarbon is formed by conventional boiling point mainly, the unifining oil product of the coal tar that to come self-contained conventional boiling point be 330～520 ℃ of cuts, fractional saturation aromatic hydrocarbons weight content greater than 8%, the hydrogen weight content is greater than 10%;
3. separation column T2 working pressure is lower than 0.010MPa (absolute pressure).
3. method according to claim 1 is characterized in that:
1. coal-based oily F1 is from coal tar;
2. the inhibited oil YJ of thermal condensation is that 330～480 ℃ hydrocarbon is formed by conventional boiling point mainly, the unifining oil product of the coal tar that to come self-contained conventional boiling point be 330～480 ℃ of cuts, fractional saturation aromatic hydrocarbons weight content greater than 12%, the hydrogen weight content is greater than 11%;
3. separation column T2 working pressure is lower than 0.005MPa (absolute pressure).
4. method according to claim 2 is characterized in that: 3. separation column T2 is provided with separation column charging process furnace T2F.
5. method according to claim 3 is characterized in that: 3. separation column T2 is provided with separation column charging process furnace T2F.
6. method according to claim 2 is characterized in that:
3. separation column charging process furnace T2F heater outlet temperature is set is 340～385 ℃ to separation column T2.
7. method according to claim 2 is characterized in that:
3. separation column charging process furnace T2F heater outlet temperature is set is 360～375 ℃ to separation column T2.
8. according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 described methods, it is characterized in that:
2. the ratio of the weight rate W2 of thermal condensation inhibited oil YJ weight rate W1 and oily logistics F12 is K=W1/W2 among the high temperature mixing oil F2, and the K value is 0.05～3.0.
9. method according to claim 8 is characterized in that: 2. the K value is 0.35～1.5.
10. according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 described methods, it is characterized in that:
Coal-based oily F1 is coalite tar or coal-tar middle oil or its distillate or its mixing oil.
11. method according to claim 9 is characterized in that:
Coal-based oily F1 is coal-tar heavy oil heavy oil or liquefied coal coil heavy oil or its distillate or its mixing oil.
12., it is characterized in that according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 described methods:
Oil logistics F21 gets into unifining process HT; Oil logistics F22 gets into hot procedure RJG (such as coking or hydrocracking process of suspended bed); Hot procedure RJG obtains mainly contains conventional boiling point and is lower than 450 ℃ product cut and gets into unifining process HT, and thermal condensation is inhibited oil for being the hydrocarbon ils of 330～520 ℃ unifining fractions consisting by the conventional boiling point of unifining process HT mainly.
13., it is characterized in that according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 described methods:
Oil logistics F12 and oily logistics F21 get into unifining process HT; Oil logistics F22 gets into hot procedure RJG (such as coking or hydrocracking process of suspended bed); Hot procedure RJG obtains mainly contains conventional boiling point and is lower than 450 ℃ product cut and gets into unifining process HT, and thermal condensation is inhibited oil for being the hydrocarbon ils of 330～480 ℃ unifining fractions consisting by the conventional boiling point of unifining process HT mainly.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106566572A (en) * | 2016-11-07 | 2017-04-19 | 中国石油大学(华东) | Process for producing high-softening-point gilsonite from coal tar heavy oil through vacuum deep extraction |
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| CN106566572A (en) * | 2016-11-07 | 2017-04-19 | 中国石油大学(华东) | Process for producing high-softening-point gilsonite from coal tar heavy oil through vacuum deep extraction |
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Application publication date: 20120711 |