CN1143888C - Preparation method of coal series needle type coke - Google Patents
Preparation method of coal series needle type coke Download PDFInfo
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- CN1143888C CN1143888C CNB001151320A CN00115132A CN1143888C CN 1143888 C CN1143888 C CN 1143888C CN B001151320 A CNB001151320 A CN B001151320A CN 00115132 A CN00115132 A CN 00115132A CN 1143888 C CN1143888 C CN 1143888C
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Abstract
The present invention relates to a preparation method of coal series needle-shaped coke. The present invention adopts prepared coal soft asphalt as raw material. The raw material is purified, regulated and carbonized, and coal series needle-shaped coke is prepared. After the raw material is heated, the raw material is purified. Two stages of vacuum flash vaporization are carried out, the temperature in the first stage is higher than that in the second stage, the pressure in the first stage is lower than that in the second stage, impurities and ingredients which have high thermal reaction activity are removed, and purified material which does not contain impurities or ingredients which have high thermal reaction activity is prepared. Simultaneously, binding agents as side products and dipping agents as joint products of high quality are respectively obtained. After being heated, the purified material is pressurized and carbonized, and concentrated material whose molecular weight distribution range is concentrated is obtained. The concentrated material is carbonized. After the concentrated material is carbonized, products are processed, and coal series needle-shaped coke products are prepared. The present invention adopts the technology of the two-stage flash evaporation and two-step carbonization, the quality of products is improved, the system can not be blocked, and no coking phenomenon occurs in equipment. Non-residual oil can be adopted to prepare coal soft asphalt as raw material, raw material resources are enlarged, and the rate of increment is enhanced.
Description
The present invention relates to a kind of preparation method of coal-based needle coke, particularly a kind of coal-based needle coke preparation method of two sections flash distillations, two step charings.
In the prior art, it is the Chinese invention patent of ZL8610067.5 and the Chinese invention patent application that publication number is CN1172147A that the patent No. is arranged, and discloses the preparation method of two kinds of coal-based needle cokes, and its raw material gives treatment process and all belongs to " flash distillation polycondensation method " category.Produce needle coke with preparation coal viscid bitumen as raw material, one of its gordian technique is a purification of raw materials, promptly removes impurity such as quinoline insolubles, ash content, poisonous metal and free charcoal one time.To this, " flash distillation polycondensation method " has good result, and still " flash distillation polycondensation method " gained vacuum oil (full fraction) slagging scorification when the pressurization polycondensation causes polycondensation reactor and back segment line clogging.Publication number is the Chinese invention patent application of CN1217365A, the coal-based needle coke two-stage coking preparation method is disclosed, establish separation column on vacuum flasher top, the full fraction of flash oil is divided into light flash oil and heavy flash oil, this heavy flash oil must be rich in the active high composition of thermal response, when its thermal polycondensation,, when it directly enters the charing tower, will generate a large amount of nascent mesophasespherules rapidly, make gained needle coke degradation faster slagging scorification.When if the title complex of preparing coal viscid bitumen or it and shale oil heavy fraction, oil heavy fraction, refining of petroleum product heavy fraction with luxuriant and rich with fragrance Residual oil is made raw material, because luxuriant and rich with fragrance Residual oil contains the not clear thing of 30-40% chromatogram, the active high composition of the contained thermal response of the full fraction of flash oil is more, and therefore above-mentioned three kinds of patented technologies all can't satisfy production requirement.
The object of the present invention is to provide the preparation method of the coal-based needle coke of coking in a kind of, no system jams strong and the equipment, good product quality to adaptability to raw material.
For achieving the above object, the present invention adopts following technical proposals: the present invention is the same with prior art, and to adopt the coal viscid bitumen of preparation be raw material, after purification of raw materials and modulation, makes coal-based needle coke through charing again.It is characterized in that purification of raw materials is after the raw material heating, temperature is higher and two sections vacuum flashings that pressure is lower with second section of first section ratio, remove the active high component of impurity and thermal response and be made for clean material free from foreign meter, as not contain the active high component of thermal response, obtain byproduct binding agent and joint product high-quality soaker simultaneously respectively; Only expect that charing is given in pressurization after heating, obtain the fine fodder that range of molecular weight distributions is concentrated, then, fine fodder is carried out charing, the charing after product is made the coal-based needle coke product through aftertreatment.Because the present invention adopts two sections vacuum flashings and two step charings, can effectively remove the active high component of impurity and thermal response, the clean material of gained can not produce slagging scorification and blocking pipeline when pre-charing thermal polycondensation, the range of molecular weight distributions of pre-charing gained fine fodder is concentrated, good product quality after this fine fodder charing.
In the present invention, can make raw material, also can utilize luxuriant and rich with fragrance Residual oil preparation coal viscid bitumen to make raw material, perhaps select for use coal viscid bitumen, coal tar, coal tar heavy duty fraction and shale oil, oil heavy fraction or their mixture to make raw material with the coal viscid bitumen of carbolineum preparation.The residue behind anthracene and the carbazole is extracted in the carbolineum fraction deep processing that luxuriant and rich with fragrance Residual oil is a coal tar, and the not clear thing content of composition complexity, particularly chromatogram is up to 30-40%, and is mobile poor, processing difficulties.During so existing coal-based needle coke is produced, mainly with carbolineum preparation coal viscid bitumen.Its theoretical foundation is the degree of graphitization height of anthracene, G=87.6%.Theoretical study results of the present invention shows, though luxuriant and rich with fragrance G=74.4%, but prepare the degree of graphitization difference Δ G=1-2% of coal viscid bitumen gained needle coke respectively with carbolineum and luxuriant and rich with fragrance oil, on the other hand, luxuriant and rich with fragrance ionization potential (IP=8.03ev) is higher than the ionization potential (IP=7.22ev) of anthracene, luxuriant and rich with fragrance thermostability is higher, this during to the liquid phase charing system mobility and carbonizing production yield favourable.
In the present invention, the two sections vacuum flashings and the theoretical foundation of giving charring process of pressurizeing are the content that clean material must strictly be controlled impurity and the active high component of thermal response, this technology can be designed to: in (1) purifying treatment, the feeding temperature of first section vacuum flashing is greater than 400 ℃, the flash distillation absolute pressure of top of the tower is 40-120kPa, extract the full cut of vacuum flashing oil that does not contain quinoline insolubles, ash content, poisonous metal element and a free charcoal impurity to greatest extent to reach from the flash distillation cat head, at the bottom of tower, discharge residual asphalt, i.e. byproduct binding agent; The feeding temperature of (2) second sections vacuum flashings is than low 0-40 ℃ of first section flash evaporation feed temperature, the flash distillation absolute pressure of top of the tower is than first section high 0-40kPa of absolute pressure of top of the tower, free from foreign meter to reach second section vacuum flashing oil, 95% does and is 380-420 ℃: obtain high-quality soaker at the bottom of the tower, free from foreign meter, ring and ball softening point is greater than 80 ℃; (3) reference mark of giving carbonizing production is: 0＜QI
2＜1%, 0＜QI in the formula
2Be secondary quinoline insolubles content; The feeding temperature that gives charing is 380-430 ℃, and furnace top pressure is 1.0-3.0MPa, and giving carbonization time is 5-20 hour.In the present invention, charring process can be designed to: the charing tower is carried out following cycleoperation: (1) constant temperature liquid phase charing phase: adopt " low temperature, low pressure, charging is even, air-flow is strong " complex optimum condition, feeding temperature is no more than 460 ℃, charing top of tower pressure is 0-0.3MPa, fine fodder and turning oil mix, upstream is rapid by force and not in the tower, Re＜104; (2) heat up clear hole cure period: adopt aromatic series light oil to make thermal barrier and the dimension temperature rise temperature operation that heats up, elevated temperature 5-10 ℃ at a slow speed of elder generation ties up warm 2-6 hour, and then is warmed up to 500-600 ℃; The charing tower operational cycle is 24-48 hour; The time ratio of constant temperature liquid phase charing phase with the clear hole of intensification cure period is 4: 1-7: 1.
In the present invention, the theoretical foundation of the technology of charing is that the calcining temperature of (1) charing after product is higher than 1410 ℃ and helps removing nitrogen compound, thereby avoids or alleviate ultra-high power graphite electrode brilliant expanding being taken place and crackle when greying; (2) needle coke intensity has anisotropy, and fiber direction intensity is big; (3) needle coke particle K value is big, when extrusion molding, be orientated, and the electrode conductivuty height of making, CTE is low.This technology can be designed to: the charing after product is made through calcining and is forged full Jiao of Jiao, forges burnt full Jiao through the upgrading sorting, output one-level, secondary, regular grade needle coke and half needle coke.The calcining of charing after product can be to carry out high-temperature calcination in rotary kiln, and temperature is 1450 ± 50 ℃; Forging burnt complete burnt upgrading sorting process can be designed to: forge burnt full Jiao and enter tangential crusher and carry out orientation and shred, to greatest extent along forging burnt complete burnt tissue fibers direction chopping, improve particle length and width ratio, increase the granule content of K＞1.76 and K＞1.85 simultaneously, send the back to carry out sorting then, obtain the one-level needle coke of K＞1.85, the secondary needle coke of K＞1.76, the regular grade needle coke of K＞1.70 and half needle coke product of K＞1.70 toward the grid band of being with sorting unit.
The present invention compared with prior art, have following conspicuous outstanding feature and remarkable advantage: (1) is owing to adopting raw material through two sections flash distillations with give the fine fodder that charing obtains high pure homogenizing among the present invention, improve quality product, coking phenomenon in no system jams and the equipment obtains byproduct binding agent and co-production of high-quality soaker simultaneously.(2) the present invention can adopt luxuriant and rich with fragrance Residual oil preparation coal viscid bitumen or it to make raw material with the title complex of shale oil heavy fraction, oil heavy fraction, refining of petroleum product heavy fraction, can farthest develop existing resource, reduces raw materials cost, the raising appreciation rate.(3) in the fine fodder charing stage, owing to adopt complex optimum conditions such as temperature is low, charging even, air-flow is rapid by force and not, the clear hole of light oil heat-carrying, the intermediate phase conversion is perfect, anisotropy pitch termination is abundant, and gained needle coke height anisotropy and particle hole wall do not have bad retention and adhere to.(4) forge Jiao through the upgrading sorting, the long-width ratio of needle cokes at different levels is increased, thermal expansivity reduces, and after sorting, one-level, secondary, regular grade needle coke and half needle coke are made greying extrusion molding sample, and the CTE value is respectively :≤0.8 * 10
-6/ ℃ ,≤0.9 * 10
-6/ ℃ ,≤1.0 * 10
-6/ ℃ and＞1.0 * 10
-6/ ℃.
Accompanying drawing is the process flow diagram of one embodiment of the invention.
Be described in further detail technology contents of the present invention below in conjunction with drawings and Examples:
Make raw material with luxuriant and rich with fragrance Residual oil preparation coal viscid bitumen, also can select for use coal viscid bitumen, coal tar heavy fractioning and shale oil, oil last running or their title complex to make raw material, technical process is: (1) raw material enters after process furnace 1 heating
#1 flashing tower 2, absolute pressure 40-120kPa, temperature greater than 400 ℃ condition under flash distillation, difference according to the raw material composition, corresponding adjustment absolute pressure, extract the full gold-plating part of vacuum flashing oil that does not contain impurity such as quinoline insolubles, ash content, poisonous metal element and free charcoal from flashing tower 2 to greatest extent, discharge residual asphalt at the bottom of the tower, i.e. byproduct binding agent is as preparation moulded coal binding agent; (2)
#1 flashing tower, 2 overhead oil vapour enter
#2 flashing towers 3 carry out flash distillation, its temperature and pressure respectively than
#1 flashing tower low 0-40 ℃ and high 0-40kPa according to its temperature and pressure of the corresponding adjustment of boiling range curve of the full gold-plating part of vacuum distillation, make overhead oil vapour obtain containing the low clean material of high reactivity material through condensation, and 95% does and is 380-420 ℃, gets joint product high-quality soaker at the bottom of the tower; (3) clean material enters and gives asher 4, under temperature 380-430 ℃, pressure 1.0-3.0MPA condition, and residence time 5-20 hour, only expect modulation treatment, main generation thermolysis, thermal polycondensation reaction, the fine fodder of generation even molecular weight distribution, the reference mark of giving carbonizing production is: 0＜QI
2＜1%, QI in the formula
2Be secondary quinoline insolubles content.Give asher 4 tops oil vapour and enter branch gold-plating device 5, be separated into gas, light oil and heavy oil.(4) fine fodder enters mixing tank 6 with turning oil (recycle ratio 1-3), being sent to process furnace 7 behind the uniform mixing heats, to inject water or steam in the pipe, process furnace 7 temperature outs are no more than 460 ℃, fine fodder enters asher 8 then, carry out the charing of constant temperature liquid phase earlier, the solid phase that heats up then charing.The charing of intensification solid phase is to stop charging, employing aromatic series light oil as thermal barrier and clear hole agent, during this period, the interior temperature maintenance of charing tower is in constant temperature liquid phase charing phase temperature or exceed 5-10 ℃, improves heat-up rate after 2-6 hour, outlet temperature is 500-600 ℃, and final condensation curing gets green coke.Overhead oil vapour is separated into gas, light oil and heavy oil through fractionation plant 9.The operational cycle of asher is 24-48 hour, two tower alternate operation chargings, and tower top pressure is 0-0.3MPa, green coke is emitted after being shredded by high pressure water in the tower.(5) Qie Sui green coke enters rotary kiln 10 and carries out high-temperature calcination, and temperature is about 1450 ℃, must forge burnt complete burnt.(6) forging burnt full Jiao is introduced into tangential crusher 11 and shreds, forging burnt full Jiao at this is farthest shredded along the fibrous tissue direction, improve particulate length and width ratio, increase the granule content of K＞1.76 and K＞1.85 simultaneously, the grid 12 that is sent to the band sorting unit then carries out sorting, obtains the one-level needle coke of K＞1.85, the secondary needle coke of K＞1.76, the regular grade needle coke of K＞1.70 and half needle coke product of K≤1.70.When making raw material with luxuriant and rich with fragrance Residual oil preparation coal viscid bitumen, implement by the foregoing description flow process and condition, obtain coal-based needle coke, high-quality soaker and preparation moulded coal with products such as binding agents, its raw material and quality product are as follows:
Luxuriant and rich with fragrance Residual oil consists of: naphthalene 2.66%, acenaphthene 2.37%, dibenzofuran 2.89%, fluorenes 5.90%, luxuriant and rich with fragrance 26.55%, anthracene 3.58%, carbazole 1.44%, fluoranthene 9.70%, pyrene 6.98%, bend 1.16% and naphthalene after not clear thing 36.77%.
The character of coal-tar pitch is: 68 ℃ of softening temperatures, ash content 0.075%, QI5.24%, TI16.55%, full sulphur 1.72%, volatile matter 50.06%.
Soaker quality index: ring and ball softening point＞80 ℃, a quinoline insolubles content 0%.This needle coke quality and the new daily use chemicals needle coke quality contrast of Japan:
The new daily use chemicals needle coke of needle coke Japan of the present invention
Fugitive constituent % 0.60 0.56
Sulphur content % 0.18 0.20
Ash content % 0.08 0.08
True density 9/,cm3 2.22 2.24
Long-width ratio Km 2.08 (1-2mm) 2.10 (1-2mm)
Resistivity 10
-6Ω mm
2/ m 7.00 7.21
CTE ×10
-6/℃ 0.97 0.90
Wherein: the CTE value refers to the measured value (100 ℃-600 ℃) behind the greying sample
True density and resistivity are the measured value behind the greying sample.
Claims (3)
1. the preparation method of a coal-based needle coke, adopting the coal viscid bitumen of preparation is raw material, raw material is after purifying and modulating, make coal-based needle coke through charing again, it is characterized in that purification of raw materials is after the raw material heating, temperature is higher and two sections vacuum flashings that pressure is lower with second section of first section ratio, removes the active high component of impurity and thermal response and makes clean material free from foreign meter, as not contain the active high component of thermal response, obtains byproduct binding agent and joint product high-quality soaker simultaneously respectively; Only expect that charing is given in pressurization after heating, obtain the fine fodder that range of molecular weight distributions is concentrated, then fine fodder is carried out charing, the charing after product is made the coal-based needle coke product through aftertreatment; Two sections vacuum flashings and the technology of giving carbonization are: in (1) purifying treatment, the feeding temperature of first section vacuum flashing is greater than 400 ℃, the flash distillation absolute pressure of top of the tower is 40～120kPa, extract the full fraction of vacuum flashing oil that does not contain impurity such as quinoline insolubles, ash content, poisonous metal element and free charcoal to greatest extent to reach from the flash distillation cat head, at the bottom of tower, discharge residual asphalt, i.e. byproduct binding agent; The feeding temperature of (2) second sections vacuum flashings is than low 0～40 ℃ of first section flash evaporation feed temperature, the flash distillation absolute pressure of top of the tower is than first section high 0～40kPa of absolute pressure of top of the tower, free from foreign meter to reach second section vacuum flashing oil, 95% to do be 380～420 ℃, obtain high-quality soaker at the bottom of the tower, ring and ball softening point free from foreign meter is greater than 80 ℃; (3) reference mark of giving carbonizing production is: 0＜QI
2＜1%, QI in the formula
2Be secondary quinoline insolubles content; The feeding temperature that gives charing is 380～430 ℃, and furnace top pressure is 1.0～3.0MPa, and giving carbonization time is 5～20 hours; During charing, the charing tower is carried out following cycleoperation: (1) constant temperature liquid phase charing phase: adopt " low temperature, low pressure, charging is even, air-flow is strong " complex optimum condition, feeding temperature is no more than 460 ℃, the charing tower top pressure is 0～0.3Mpa, fine fodder and turning oil mix, upstream is rapid by force and not in the tower, Re＜104; (2) heat up clear hole cure period: adopt aromatic series light oil to make thermal barrier and the dimension temperature rise temperature operation that heats up, 5～10 ℃ of elevated temperatures at a slow speed earlier, warm 2～6 hours of dimension, and then be warmed up to 500～600 ℃; The charing tower operational cycle is 24～48 hours; The time ratio of constant temperature liquid phase charing phase with the clear hole of intensification cure period is 4: 1～7: 1; The charing after product, through calcining make forge burnt complete burnt, forge burnt complete burnt through the upgrading sorting, output one-level, secondary, regular grade needle coke and half needle coke.
2. the preparation method of coal-based needle coke according to claim 1, it is characterized in that making raw material with the coal viscid bitumen of carbolineum preparation, perhaps utilize luxuriant and rich with fragrance Residual oil preparation coal viscid bitumen to make raw material, perhaps select for use coal viscid bitumen, coal tar distillate and shale oil, oil heavy fraction or their title complex to make raw material.
3. the preparation method of coal-based needle coke according to claim 1, the calcining that it is characterized in that the charing after product is to carry out high-temperature calcination in rotary kiln, temperature is 1450 ± 50 ℃; Forging burnt complete burnt upgrading sorting is: forge burnt full Jiao and enter tangential crusher and carry out orientation and shred, to greatest extent along forging burnt complete burnt particulate tissue fibers direction chopping, improve particle length and width ratio, increase the granule content of K＞1.76 and K＞1.85 simultaneously, the grid band that is sent to the band sorting unit then carries out sorting, obtains the one-level needle coke of K＞1.85K, the secondary needle coke of K＞1.71, the regular grade needle coke of K＞1.70 and half needle coke product of K＜1.70.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001151320A CN1143888C (en) | 2000-03-24 | 2000-03-24 | Preparation method of coal series needle type coke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001151320A CN1143888C (en) | 2000-03-24 | 2000-03-24 | Preparation method of coal series needle type coke |
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| Publication Number | Publication Date |
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| CN1268544A CN1268544A (en) | 2000-10-04 |
| CN1143888C true CN1143888C (en) | 2004-03-31 |
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| CNB001151320A Expired - Lifetime CN1143888C (en) | 2000-03-24 | 2000-03-24 | Preparation method of coal series needle type coke |
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| CN (1) | CN1143888C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051191B (en) * | 2009-11-03 | 2013-07-24 | 上海宝钢化工有限公司 | Production method and system of coal-based needle coke |
| CN101776547B (en) * | 2010-01-20 | 2011-06-08 | 中国科学院山西煤炭化学研究所 | Method for easily and quickly evaluating needle coke |
| CN101818076B (en) * | 2010-05-07 | 2013-04-03 | 杨东平 | Processing technology for water/ash-containing tar |
| CN102965133B (en) * | 2012-10-31 | 2014-10-15 | 山西永东化工股份有限公司 | Production method of coal-based needle coke |
| CN109135789B (en) * | 2018-08-16 | 2021-09-28 | 中钢集团鞍山热能研究院有限公司 | Method for preparing needle coke from medium-low temperature coal tar |
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2000
- 2000-03-24 CN CNB001151320A patent/CN1143888C/en not_active Expired - Lifetime
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