CN116179230A - Device and method for preparing high-quality needle coke - Google Patents
Device and method for preparing high-quality needle coke Download PDFInfo
- Publication number
- CN116179230A CN116179230A CN202211728837.9A CN202211728837A CN116179230A CN 116179230 A CN116179230 A CN 116179230A CN 202211728837 A CN202211728837 A CN 202211728837A CN 116179230 A CN116179230 A CN 116179230A
- Authority
- CN
- China
- Prior art keywords
- coking
- coking tower
- tower
- needle coke
- heating furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B55/00—Coking mineral oils, bitumen, tar, and the like or mixtures thereof with solid carbonaceous material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention relates to a device and a method for preparing high-quality needle coke, which mainly comprise a heavy oil feed pump, a heating furnace I, a pre-coking tower, a heating furnace II and a coking tower, wherein the heavy oil feed pump is connected with the heating furnace I, the heating furnace is connected with the pre-coking tower, the pre-coking tower is connected with the heating furnace II, an outlet of the heating furnace II is connected with the coking tower, and an electromagnetic induction heating facility is arranged on the coking tower. The needle coke preparation process adopting the two-step method can adjust the pre-coking reaction condition in real time according to the composition change of the heavy oil to obtain a low softening point intermediate with stable properties, and ensures the stable operation of a coking tower and the quality of the needle coke; the coking tower adopts the magnetic induction heating technology, so that the problems of large heat loss, short service life and inconvenient disassembly of a heat preservation structure existing in the heat preservation of the coking tower are avoided, and the complementary heat of electromagnetic induction is beneficial to the uniform distribution of the temperature of the coking tower. Under the action of electromagnetic induction magnetic field, the intermediate is favorable for better magnetic orientation arrangement, so that the high-crystallinity high-quality needle coke is obtained.
Description
Technical Field
The invention relates to the technical field of needle coke production, in particular to a device and a method for preparing high-quality needle coke.
Background
Needle coke is coke with special properties generated in the thermal conversion process of coal-based or oil-based raw materials, and is a raw material for producing carbon products such as graphite electrodes, lithium battery cathode materials, carbon composite materials and the like. The carbon product prepared by the method has the characteristics of high purity, low ablation quantity, low thermal expansion coefficient and the like, so the carbon product is widely used in the fields of metallurgy, new energy sources and the like.
In the delayed coking process adopted in the preparation of the domestic needle coke at present, a delayed coking device completes the whole process from heavy oil to the preparation of the needle coke, so that the control of the coking process is difficult, and the quality of the needle coke is difficult to ensure. The main disadvantages are as follows: unstable quality, difficulty in long-period operation of the device, and the like. CN1132895C, CN1172147a adopts a two-stage coking preparation method of needle coke, and the needle coke is prepared by two-stage heating in a delayed coking device, and light oil with heat is adopted, so that the problems that the fluctuation of the operating condition of the device is large, and the quality of the needle coke is affected by the coke generated by polycondensation of the light oil with heat at high temperature exist, and the quality of the needle coke is unstable; the needle coke is prepared by adopting two-stage carbonization reactions in US20050284793A1, CN106544045 and CN106147835, and the high-viscosity carbonized product is easy to cause furnace tube coking when passing through a traditional heating furnace, so that the problem of long-period operation difficulty exists; CN106566570A, CN114540059a adopts the two-step reaction in the reaction kettle to prepare needle coke after the pretreatment of raw materials, and has the problem of difficult realization in industry.
At present, the domestic delayed coking device is basically provided with a patent ZL01243692.1 belt type heat preservation structure, and the heat preservation structure can not heat the coking device and can not solve the problem of uneven temperature distribution in the coking tower although the heat preservation effect is greatly improved.
Disclosure of Invention
The invention takes heavy oil as raw material, uses electromagnetic induction heating technology to supplement heat and preserve heat to the coking tower, and adopts a pre-coking two-step method to produce high-quality needle coke.
The invention adopts the following technical scheme for realizing the purposes:
a device for preparing high-quality needle coke mainly comprises a heavy oil feed pump, a heating furnace I, a pre-coking tower, a heating furnace II and a coking tower, wherein the heavy oil feed pump is connected with the heating furnace I, the heating furnace is connected with the pre-coking tower, the pre-coking tower is connected with the heating furnace II, an outlet of the heating furnace II is connected with the coking tower, and an electromagnetic induction heating facility is arranged on the coking tower.
The electromagnetic induction heating facility is an intermediate frequency electromagnetic induction heating furnace.
The pre-coking tower and the coking tower are provided with an oil gas outlet.
The coking tower is two coking towers which are connected in parallel.
The back of the coking tower is provided with a fractionating tower, and the feeding port of the fractionating tower is connected with oil gas outlets arranged on the coking tower and the pre-coking tower.
The fractionating tower is provided with coking gas, coking gasoline, coking diesel oil, coking wax oil and coking circulating oil outlets.
The coking circulating oil outlet of the fractionating tower is connected with the inlet of the circulating oil pump, and the outlet of the circulating oil pump is connected with the feeding pipeline of the heating furnace I.
Method for preparing high-quality needle coke
(1) The heavy oil enters a pre-coking tower through a heating system, and the reaction temperature and the reaction pressure of the pre-coking tower are controlled to prepare a low softening point intermediate;
(2) The intermediate with low softening point is heated by a heating furnace, enters a coking tower to remove raw coke and volatile matters after being heated to a certain temperature, and the coking tower is subjected to heat supplementing and heat preservation by adopting an electromagnetic induction heating technology, so that a high-quality needle coke product is prepared.
The needle coke preparation process adopts a pre-coking two-step method.
The coking tower adopts electromagnetic induction heating technology to carry out heat supplementing and heat preservation.
The heavy oil is at least one selected from naphthalene compounds, petroleum heavy fraction, ethylene cracking tar, coal tar and fractions.
The heavy oil satisfies the requirements of asphaltene content less than 10%, sulfur content less than 0.5%, aromatic hydrocarbon content more than 50% and ash content less than 0.05%.
The reaction temperature of the pre-coking tower is 380-500 ℃, the reaction pressure is 0.3-3MPa, the low softening point intermediate is prepared, and the softening point range of the low softening point intermediate is 100-350 ℃.
The reaction temperature of the coking tower is 450-550 ℃ and the reaction pressure is 0-1MPa, so that high-quality needle coke is prepared.
The purified heavy oil raw material with the asphaltene content of less than 10%, the sulfur content of less than 0.5%, the aromatic hydrocarbon content of more than 50% and the ash content of less than 0.05% has low sulfur content, asphaltene content and ash content, reduces the reactivity of the raw material, is favorable for reducing the reaction intensity and enhancing the process control, can reduce the impurity and amorphous carbon content in the needle coke product, and improves the quality of the needle coke product.
In the pre-coking tower, the heavy oil is subjected to shallow condensation at low temperature (380-500 ℃) and high pressure (0.3-3 MPa) to prepare a low softening point intermediate, the pyrolysis and polycondensation reaction in the raw materials are slowly carried out at low temperature, amorphous coke powder is not produced due to severe polycondensation, meanwhile, the escape of small molecular hydrocarbon is inhibited by high pressure, the viscosity of a reaction system can be reduced, and the quality and the yield of needle coke products are improved.
In the coking tower, the intermediate with low softening point is deeply carbonized at high temperature (450-550 ℃) and low pressure (0-1 MPa) and volatile matters are removed. The high temperature aggravates the thermal decomposition and thermal polycondensation reaction, further improves the reaction condensation depth and the alignment orientation degree of macromolecules, and simultaneously, the low pressure leads the generated micromolecular light hydrocarbon gas to be discharged out of the reaction system to form gas flow coke pulling, thus obtaining needle coke products.
Compared with the existing preparation method, the invention has the beneficial effects that:
(1) The invention prepares needle coke by a two-step method, and realizes the whole process control of preparing high-quality needle coke by independently controlling a pre-coking tower and a coking tower. The low softening point intermediate can effectively reduce the coking speed of the pipeline, and is beneficial to long-period operation of the device. Meanwhile, the invention can adjust the reaction conditions in real time according to the composition change of the heavy oil, ensures the stability of the needle coke quality, and has flexible operation and strong raw material adaptability.
(2) At present, a coking tower of a delayed coking device is only heated when being insulated, so that the coking tower body cannot be timely supplemented with heat after heat dissipation, the upper, middle and lower temperatures of the coking tower are unevenly distributed, and the coking tower is supplemented with heat and insulated by utilizing an electromagnetic induction heating technology, which is an initiative. The electromagnetic induction heating has the characteristics of energy conservation, environmental protection, rapid heating, uniform heat distribution and the like, obviously improves the problem of nonuniform temperature distribution in the coking tower, simultaneously, the intermediate similar to liquid crystal has magnetism, and is favorable for better magnetic orientation arrangement of the intermediate under the action of an electromagnetic induction magnetic field, thereby obtaining the needle coke product with high crystallinity.
(3) The invention has simple and reasonable process and is easy for industrial application and popularization.
Drawings
FIG. 1 is a schematic view of an apparatus for producing high-quality needle coke according to the present invention
Wherein: 1-heavy oil feeding pump 2-heating furnace I3-pre-coking tower 4-pre-coking tower oil gas outlet line 5-heating furnace II 6, 7-coking tower 8-fractionating tower 9-coking gas 10-coking gasoline 11-coking diesel oil 12-coking wax oil 13-coking circulating oil 14-circulating oil pump 15-electromagnetic induction heating facility
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings and examples. The specific embodiments described herein are offered by way of illustration and explanation only, and are not intended to limit the invention.
The invention relates to a device for preparing high-quality needle coke, which mainly comprises a heavy oil feed pump, a heating furnace I, a pre-coking tower, a heating furnace II and a coking tower, wherein the heavy oil feed pump is connected with the heating furnace I, the heating furnace is connected with the pre-coking tower, the pre-coking tower is connected with the heating furnace II, an outlet of the heating furnace II is connected with the coking tower, an oil gas outlet of the coking tower is connected with a fractionating tower, a coking circulating oil outlet at the bottom of the fractionating tower is connected with a circulating oil pump, and an intermediate-frequency electromagnetic induction heating furnace is arranged in the coking tower.
The needle coke is prepared from purified heavy oil serving as a raw material by adopting an electromagnetic induction heating technology through a pre-coking two-step method.
Example 1
The catalytic cracking slurry oil with the asphaltene content of 6%, the sulfur content of 0.4% and the arene content of 62% is heated by a heating furnace and then enters a pre-coking tower, the reaction temperature of the pre-coking tower is controlled to be 380 ℃ and the reaction pressure of 0.3MPa, a low softening point intermediate is prepared, the low softening point intermediate is heated to 550 ℃ by the heating furnace and then enters a coking tower to be subjected to deep carbonization and volatile component removal, the reaction pressure in the coking tower is controlled to be 1MPa, the coking tower is subjected to heat supplementing and heat preservation by a 40kw intermediate frequency electromagnetic induction heating furnace, the temperatures of materials at the upper part, the middle part and the lower part in the coking tower are respectively 535+/-5 ℃ and 540+/-5 ℃, and finally, a high-quality needle coke product is obtained, and the properties of the needle coke are shown in table 1.
Example 2
The catalytic cracking slurry oil with the asphaltene content of 6%, the sulfur content of 0.4% and the arene content of 62% is heated by a heating furnace and then enters a pre-coking tower, the reaction temperature of the pre-coking tower is controlled to be 500 ℃, the reaction pressure of the pre-coking tower is controlled to be 3MPa, a low softening point intermediate is prepared, the low softening point intermediate is heated to be 550 ℃ by the heating furnace and then enters the coking tower to be subjected to deep carbonization and volatile component removal, the reaction pressure of the coking tower is controlled to be 0MPa, the coking tower is subjected to heat supplementing and heat preservation by a 40kw intermediate frequency electromagnetic induction heating furnace, the temperatures of materials at the upper part, the middle part and the lower part in the coking tower are respectively 535+/-5 ℃, 540+/-5 ℃ and 545+/-5 ℃, and finally high-quality needle coke products are obtained, and the properties of the needle coke are shown in table 1.
Example 3
Vacuum residuum with 9% of asphaltene, 0.5% of sulfur and 57% of aromatic hydrocarbon is heated by a heating furnace and then enters a pre-coking tower, the reaction temperature of the pre-coking tower is controlled to be 400 ℃, the reaction pressure is controlled to be 1.0MPa, a low softening point intermediate is prepared, the low softening point intermediate is heated to be 450 ℃ by the heating furnace and then enters the coking tower to be subjected to deep carbonization and volatile component removal, the reaction pressure in the coking tower is controlled to be 0.2MPa, the coking tower is subjected to heat supplementing and heat preservation by a 20kw intermediate frequency electromagnetic induction heating furnace, the temperatures of materials at the upper part, the middle part and the lower part in the coking tower are respectively 435+/-5 ℃, 440+/-5 ℃ and 445+/-5 ℃, and finally, a high-quality needle coke product is obtained, and the properties of the needle coke are shown in table 1.
Example 4
Heating heavy aromatic oil with 4% of asphaltene, 0.4% of sulfur and 78% of aromatic hydrocarbon by a heating furnace, then feeding the heated heavy aromatic oil into a pre-coking tower, controlling the reaction temperature of the pre-coking tower to be 450 ℃ and the reaction pressure to be 2.0MPa, preparing a low softening point intermediate, heating the low softening point intermediate to be 500 ℃ by the heating furnace, feeding the low softening point intermediate into the coking tower for deep carbonization and volatile component removal, controlling the reaction pressure in the coking tower to be 0.2MPa, and carrying out heat supplementing and heat preservation on the coking tower by adopting a 20Kw intermediate frequency electromagnetic induction heating furnace, wherein the temperatures of materials at the upper part, the middle part and the lower part in the coking tower are respectively 485+/-5 ℃ and 490+/-5 ℃, so as to finally obtain high-quality needle coke products, and the properties of the needle coke are shown in table 1.
Comparative example
The catalytic cracking slurry oil with the asphaltene content of 6%, the sulfur content of 0.4% and the arene content of 62% is heated by a heating furnace and then enters a pre-coking tower, the reaction temperature of the pre-coking tower is controlled to be 380 ℃, the reaction pressure of the pre-coking tower is controlled to be 0.3MPa, a low softening point intermediate is prepared, the low softening point intermediate is heated to be 550 ℃ by the heating furnace and then enters a coking tower to be subjected to deep carbonization and volatile component removal, the reaction pressure in the coking tower is controlled to be 1MPa, the coking tower does not use an electromagnetic induction heating furnace, the temperatures of materials at the upper part, the middle part and the lower part in the coking tower are respectively 490+/-5 ℃, 520+/-5 ℃ and 540+/-5 ℃, and finally needle coke products are obtained, and the properties of the needle coke are shown in table 1.
Table 1 needle Jiao Xingzhi prepared in examples and comparative examples
Claims (10)
1. The utility model provides a device of high-quality needle coke of preparation, mainly comprises heavy oil feed pump, heating furnace I, pre-coking tower, heating furnace II, coking tower, and heavy oil feed pump is connected with heating furnace I, and the heating furnace is connected with pre-coking tower, and pre-coking tower is connected with heating furnace II, and the heating furnace II export is connected with the coking tower, its characterized in that: an electromagnetic induction heating facility is arranged on the coking tower.
2. The apparatus for producing high-quality needle coke according to claim 1, wherein the electromagnetic induction heating means is an intermediate frequency electromagnetic induction heating furnace.
3. The device for preparing high-quality needle coke according to claim 1, wherein the pre-coking tower and the coking tower are provided with oil gas outlets, and the coking tower is two coking towers connected in parallel; the coking tower is provided with a fractionating tower at the back, a feeding hole of the fractionating tower is connected with oil gas outlets arranged on the coking tower and the pre-coking tower, the fractionating tower is provided with coking gas, coking gasoline, coking diesel oil, coking wax oil and coking circulating oil outlets, a coking circulating oil outlet of the fractionating tower is connected with a circulating oil pump inlet, and a circulating oil pump outlet is connected with a feeding pipeline of the heating furnace I.
4. A process for preparing high-quality needle coke from heavy oil includes such steps as pre-coking to obtain low-softening-point intermediate, heating, coking in coking tower, and removing volatile components.
5. The method for producing high-quality needle coke according to claim 4, wherein: (1) The heavy oil enters a pre-coking tower through a heating system, and the reaction temperature and the reaction pressure of the pre-coking tower are controlled to prepare a low softening point intermediate; (2) The intermediate with low softening point is heated by a heating furnace, enters a coking tower to remove raw coke and volatile matters after being heated to a certain temperature, and the coking tower is subjected to heat supplementing and heat preservation by adopting an electromagnetic induction heating technology, so that a high-quality needle coke product is prepared.
6. The method for producing high-quality needle coke according to claim 4, wherein the heavy oil is at least one selected from the group consisting of naphthalene compounds, petroleum heavy fractions, ethylene cracking tar, coal tar and fractions.
7. The method of producing high quality needle coke according to claim 4, wherein the heavy oil has an asphaltene content of less than 10%, a sulfur content of less than 0.5%, an aromatics content of greater than 50% and an ash content of less than 0.05%.
8. The method for producing needle coke of good quality according to claim 4, wherein the pre-coking tower has a reaction temperature of 380-500 ℃ and a reaction pressure of 0.3-3MPa.
9. The process for producing high-quality needle coke according to claim 4, wherein the low softening point intermediate has a softening point in the range of 100 to 350 ℃.
10. The method for producing high-quality needle coke according to claim 4, wherein the coking tower has a reaction temperature of 450-550 ℃ and a reaction pressure of 0-1 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211728837.9A CN116179230A (en) | 2022-12-30 | 2022-12-30 | Device and method for preparing high-quality needle coke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211728837.9A CN116179230A (en) | 2022-12-30 | 2022-12-30 | Device and method for preparing high-quality needle coke |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116179230A true CN116179230A (en) | 2023-05-30 |
Family
ID=86435755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211728837.9A Pending CN116179230A (en) | 2022-12-30 | 2022-12-30 | Device and method for preparing high-quality needle coke |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116179230A (en) |
-
2022
- 2022-12-30 CN CN202211728837.9A patent/CN116179230A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101724420B (en) | Production method of needle coke raw material | |
| CN101724421B (en) | Production method of needle coke | |
| CN109370642B (en) | Delayed coking process for preparing coal-based needle coke | |
| CN102021005B (en) | Method for producing needle coke | |
| CN115093874B (en) | Preparation method and system of low-quinoline insoluble high-softening-point petroleum-based coated asphalt | |
| CN106566570B (en) | A kind of method that mink cell focus prepares high-quality needle coke | |
| CN102041011B (en) | Method for preparing needle coke through still coking | |
| CN219156818U (en) | Device for preparing high-quality needle coke | |
| CN116179230A (en) | Device and method for preparing high-quality needle coke | |
| CN110540855B (en) | Petroleum-series impregnating asphalt and preparation method thereof | |
| CN113004924B (en) | Needle coke production process for ultrahigh-power graphite electrode joint | |
| CN109135789B (en) | Method for preparing needle coke from medium-low temperature coal tar | |
| CN102041013B (en) | Method for producing needle coke raw material by using delayed coking process | |
| CN112574770B (en) | Preparation method of high-quality coal-based needle coke | |
| CN114410332B (en) | Mesophase pitch and preparation method thereof | |
| CN113755211B (en) | Method for producing needle coke by using raw material containing optimized ethylene tar | |
| CN106403579B (en) | A kind of method that mesophase pitch prepares high-quality needle coke electrode material | |
| CN113801689B (en) | Method for treating heavy oil by supercritical hydrothermal modification and delayed coking technology | |
| CN112831335B (en) | Method for preparing mesophase pitch and mesophase carbon microspheres from heavy oil | |
| CN111377428B (en) | Method for preparing needle coke by using medium-low temperature coal tar | |
| CN111892941B (en) | Coking device and process method for producing needle coke | |
| CN108690653B (en) | Light coking raw material, light-weight method and application thereof, and delayed coking method | |
| CN111073692B (en) | Preparation method and system of high-quality petroleum coke | |
| CN112745962A (en) | Vertical biomass cracking reaction device | |
| CN117264646A (en) | Method for co-producing mesophase pitch and high-quality needle coke |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |