Conductive carbon black production method and system

Abstract

The invention provides a conductive carbon black production method and system, and the method comprises the following steps: preheating air and raw oil: preheating the air and the raw oil through high-temperature flue gas generated by a reaction furnace, so that the air and raw materials reach the preheating temperature; carbon black reaction: natural gas and preheated air are mixed and introduced into a combustion chamber of the reaction furnace to be combusted, high-temperature combustion airflow is generated, and the temperature of the high-temperature combustion airflow is 1850-1950 DEG C; the preheated raw oil is sprayed from the tail of the combustion chamber and mixed with the high-temperature combustion airflow to generate carbon black and flue gas; the time from the generation of the carbon black to the termination of the reaction is controlled to be 0.25-0.35 second; the airflow direction in the reaction furnace is controlled to change in the carbon black reaction process; heat exchange and cooling: cooling the carbon black and the flue gas to a temperature within a cooling temperature; carbon black collection: introducing the heat-exchanged and cooled carbon black and flue gas into a bag filter to filter and separate out carbon black and tail gas; and deslagging the carbon black, and separating impurities in the carbon black through a deslagging device to obtain pure carbon black.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon black production, and particularly relates to a method and system for producing conductive carbon black. BACKGROUND

[0002] The oil furnace method is a mainstream method for producing carbon black at present, and the yield accounts for a large part of the total yield. The method uses liquid hydrocarbons (such as coal tar, heavy oil, etc.) as raw materials, and generates carbon black through incomplete combustion and pyrolysis at high temperature by using a specific combustion device. After pretreatment, the raw materials are mixed with a proper amount of air and sprayed into a high-temperature oil furnace. The main process flow is that the hydrocarbon raw materials generate pyrolysis and incomplete combustion at high temperature to generate carbon black and tail gas. Then, through cooling, collection, granulation and other processes, the finished carbon black is obtained. However, the carbon black prepared by the oil furnace method in the prior art has the disadvantages of poor structure, etc. SUMMARY

[0003] In view of this, the embodiments of the present application provide a method and system for producing conductive carbon black to eliminate or improve one or more defects in the prior art.

[0004] The present application provides a method for producing conductive carbon black, comprising the following steps:

[0005] The air and raw oil are preheated by high-temperature flue gas generated by the reaction furnace, so that the air and raw oil reach the preheating temperature;

[0006] Carbon black reaction: natural gas and preheated air are mixed and introduced into the combustion chamber of the reaction furnace to generate high-temperature combustion gas flow, and the temperature of the high-temperature combustion gas flow is 1850-1950℃; the preheated raw oil is sprayed from the tail of the combustion chamber and mixed with the high-temperature combustion gas flow to generate carbon black and flue gas; the reaction time from the generation of carbon black to the termination is controlled to be 0.25-0.35 seconds; and the airflow direction in the reaction furnace is changed during the carbon black reaction process;

[0007] Heat exchange and cooling: the carbon black and flue gas are cooled to a cooling temperature;

[0008] Carbon black collection: the carbon black and flue gas after heat exchange and cooling are introduced into a bag filter to separate the carbon black and tail gas;

[0009] Carbon black slag removal: impurities in the carbon black are separated by a slag remover to obtain pure carbon black.

[0010] In one of the embodiments, the method further comprises the following steps:

[0011] Carbon black conveying and storage: the pure carbon black is conveyed to a powder bag filter by a fan for dust removal, and the carbon black after dust removal is conveyed to a product storage tank;

[0012] Product packaging and warehousing; carbon black packaging and warehousing according to customer requirements.

[0013] In one embodiment, the feedstock oil is injected from the tail end of the combustion chamber in a radial direction along the cross-section of the combustion chamber. The feedstock oil is injected into the combustion chamber through multiple oil lines, and each oil line is arranged at equal intervals along the circumference of the cross-section of the combustion chamber.

[0014] In one embodiment, the fuel oil injection path includes at least three streams.

[0015] In one embodiment, during the carbon black reaction step, the reaction time from carbon black formation to termination is controlled by introducing quench water at different locations along the length of the quenching section of the reactor.

[0016] In one embodiment, during the carbon black reaction step, the direction of the airflow in the reactor is controlled to change from horizontal to vertically upward, then back to horizontal, then back to vertically downward, and then back to horizontal again, in order to increase the collision frequency of the nucleation process.

[0017] In one embodiment, the feedstock oil includes anthracene oil; the air preheating temperature is 580–620°C, and the feedstock oil preheating temperature is 120–180°C;

[0018] In the heat exchange and cooling step, the cooling temperature is 230–290°C;

[0019] Impurities include agglomerated carbon black, rust, and slag.

[0020] The present invention also provides a conductive carbon black production system, based on the aforementioned conductive carbon black production method, comprising a raw material oil storage device, an air supply device, a natural gas supply device, a reactor, a quench water supply device, and a carbon black filtration and impurity removal device.

[0021] The reactor comprises a combustion section, a throat section, a reaction section, and a residence section connected in sequence.

[0022] The feedstock oil storage device is connected to the tail end of the combustion section and is used to inject preheated feedstock oil into the tail end of the combustion section.

[0023] The air supply device is connected to the head of the combustion section and is used to introduce preheated air into the combustion section;

[0024] The natural gas supply device is connected to the head of the combustion section and is used to supply natural gas into the combustion section;

[0025] The reaction section has a flow direction changing structure, which changes the direction of the airflow passing through the flow direction changing structure.

[0026] The reaction section has a plurality of quench water inlets spaced apart along its extension direction. Each of the quench water inlets is connected to the quench water supply device and is used to control the position of the quench water to change the carbon black reaction time.

[0027] The carbon black filtration and impurity removal device is indirectly connected to the residence section and is used to remove flue gas and impurities from the carbon black.

[0028] In one embodiment, the tail end of the combustion section has multiple raw material inlet channels, the axis of which intersects the axis of the combustion section.

[0029] In one embodiment, the flow direction changing structure is a Π-shaped structure.

[0030] The conductive carbon black production method and system in this invention have the following technical advantages: This invention uses an oil furnace method to prepare carbon black, which has the advantages of high output, low cost, diverse varieties, low energy consumption, and high yield. In this invention, the raw material oil is injected from the tail end of the combustion chamber, which, compared to the traditional throat injection, is beneficial for improving the carbon black structure. This invention uses a "Π"-shaped reactor, which is conducive to the dendritic aggregation of the carbon black structure. The product quality of this invention has been verified by the market and has reached the international advanced level.

[0031] Additional advantages, objects, and features of the invention will be set forth in part in the description which follows, and will also become apparent in part to those skilled in the art upon studying the description, or may be learned by practice of the invention. The objects and other advantages of the invention can be realized and obtained by means of the structures specifically pointed out in the description and drawings.

[0032] Those skilled in the art will understand that the objectives and advantages achievable with the present invention are not limited to those specifically described above, and that the above and other objectives achievable with the present invention will become clearer from the following detailed description. Attached Figure Description

[0033] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, are not intended to limit the scope of the invention. The components in the drawings are not drawn to scale but are merely illustrative of the principles of the invention. For ease of illustration and description of certain parts of the invention, corresponding portions in the drawings may be enlarged, i.e., may appear larger relative to other components in an exemplary device actually manufactured according to the invention.

[0034] Figure 1 This is a flowchart of a conductive carbon black production method according to an embodiment of the present invention.

[0035] Figure 2 This is a flowchart of a conductive carbon black production method according to another embodiment of the present invention.

[0036] Figure 3 This is a schematic diagram of the structure of a conductive carbon black production system in one embodiment of the present invention.

[0037] Figure 4 This is a schematic diagram showing the feed oil being injected from the tail end of the combustion chamber in one embodiment of the present invention.

[0038] Figure 5 This is a schematic diagram of the carbon black formation process in one embodiment of the present invention.

[0039] Figure 6 This is a screenshot of the process operation record of a conductive carbon black production method in one embodiment of the present invention. Figure 1 .

[0040] Figure 7 This is a screenshot of the process operation record of a conductive carbon black production method in one embodiment of the present invention. Figure 2 .

[0041] Attached reference numerals: 11. Combustion section; 12. Throat section; 13. Reaction section; 14. Quenching section; 15. Residence section; 21. First anthracene oil tank; 22. Second anthracene oil tank; 23. Return oil cooler; 24. Feed oil preheater; 25. Waste heat boiler; 31. Main blower; 32. Air preheater; 41. Main bag filter; 42. Reprocessing bag filter; 43. Cooling auger; 51. Slag remover; 52. Powder blower; 53. Powder bag filter; 61. Non-conforming tank; 62. Feeding auger. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this invention are used to explain the invention, but are not intended to limit the invention.

[0043] It should also be noted that, in order to avoid obscuring the invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the invention are shown in the accompanying drawings, while other details that are not closely related to the invention are omitted.

[0044] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, element, step, or component, but does not exclude the presence or addition of one or more other features, elements, steps, or components.

[0045] It should also be noted that, unless otherwise specified, the term "connection" in this article can refer not only to a direct connection, but also to an indirect connection involving an intermediary.

[0046] In the following description, embodiments of the invention will be illustrated with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar parts, or the same or similar steps.

[0047] The principle of carbon black conducting electricity is as follows:

[0048] 1. Graphite-like structure: Carbon atoms in carbon black form a graphite-like structure with sp2 hybrid orbitals. This structure allows some electrons to move freely between layers, forming a π electron cloud, which gives carbon black a certain degree of conductivity.

[0049] 2. Porosity: Affects the specific surface area of ​​carbon black, interparticle contact, and tunneling effect (smaller interparticle gaps allow electrons to jump between particles). Higher porosity means lower carbon black bulk density, fewer actual contact points between particles, and decreased conductivity; lower porosity limits the tunneling effect, hindering electron jumping between carbon black particles and reducing conductivity; moderate porosity better balances specific surface area and interparticle contact, making it easier for carbon black to form good conductive pathways in the material.

[0050] 3. Particle size: The smaller the particle size, the larger the specific surface area of ​​the carbon black, the more contact points between particles, or the smaller the interparticle spacing in the dispersion system, which reduces the resistance and increases the conductivity.

[0051] 4. Structure: The complex branched structure of carbon black can be easily intertwined and linked to form a conductive path.

[0052] 5. Purity: For the same type of carbon black, higher purity results in better electrical conductivity.

[0053] The role of conductive carbon black in negative electrode slurry is as follows:

[0054] Conductive carbon black plays a crucial role in negative electrode slurry, and its core functions include:

[0055] 1. Construct a conductive network:

[0056] a. Although graphite particles themselves have good conductivity, the contact resistance between particles in the compacted electrode sheet is still relatively large.

[0057] b. The conductive carbon black particles are small, with extremely high specific surface area and well-developed pore structure, which can fill the gaps between graphite particles.

[0058] c. Like a “wire” or “bridge”, it forms a three-dimensional electronic conductive network between graphite particles and between graphite particles and current collectors, significantly reducing the internal resistance of the electrode.

[0059] 2. Improved rate performance: A good conductive network ensures that electrons can be transported quickly throughout the entire electrode, allowing the active material to participate more fully in the reaction during high-rate charging and discharging (fast charging and discharging), reducing polarization loss and improving power output.

[0060] 3. Improved Cyclic Stability: A stable conductive network helps maintain the integrity of the electrode structure. During charge-discharge cycles, graphite undergoes volume expansion and contraction (~10%). A good conductive network can buffer the stress caused by volume changes, maintain electrical contact between particles, and reduce capacity decay.

[0061] 4. Promote lithium-ion diffusion (indirectly): Although its main function is to conduct electrons, building a good conductive network also helps to maintain a uniform current distribution, thereby indirectly promoting the uniform insertion and extraction of lithium ions in the electrode.

[0062] 5. Reduce interfacial contact resistance: Improve electrical contact between active material particles and between the active material layer and the current collector copper foil.

[0063] Furnace-process conductive carbon black: This process uses gaseous hydrocarbons, liquid hydrocarbons, or mixtures thereof as raw materials, and supplies an appropriate amount of air to form a closed turbulent system in a reactor. Part of the raw material hydrocarbons and air are burned to generate high temperatures, while the other part is cracked to produce carbon black.

[0064] This invention controls the carbon black production process, adjusting parameters such as particle size (iodine absorption value), structure (oil absorption value), sieve residue (foreign matter), and surface residue (toluene transmittance). The resulting carbon black is suspended in flue gas, cooled, filtered, and collected to obtain the final product. Due to the closed system, this product has a pure surface and controllable structure, which facilitates more efficient energy transfer within lithium-ion batteries. It forms a permeable network, allowing electrons to flow and enhancing electrical performance and power response during charging and discharging. This conductive additive is effective for both anodes and cathodes. It is also compatible with lithium iron phosphate (LFP) batteries, nickel-manganese-cobalt (NMC) batteries, and other batteries. It has been well-received by customers since its market launch.

[0065] Reference Figure 1 This invention provides a method for producing conductive carbon black, comprising the following steps:

[0066] S1. Preheating of air and feedstock oil: The high-temperature flue gas generated by the reactor preheats the air and feedstock oil to the preheating temperature. Preheating air and feedstock oil using the high-temperature flue gas from the reactor significantly improves energy efficiency, and precise control of the preheating temperature creates ideal conditions for subsequent reactions.

[0067] S2, carbon black reaction, involves mixing natural gas and preheated air and passing it into the combustion chamber of the reactor to generate a high-temperature combustion gas flow, with a temperature of 1850-1950℃. This provides sufficient heat energy for carbon black pyrolysis. The flow rate of the high-temperature flue gas in the combustion furnace has a significant impact on carbon black production. High temperature and high flow rate are conducive to the rapid vaporization and pyrolysis of raw materials, resulting in more uniform particle size.

[0068] The preheated feedstock oil is injected from the tail end of the combustion chamber and mixed with the high-temperature combustion airflow to generate carbon black and flue gas. The feedstock oil mixes with the high-temperature combustion airflow and rapidly decomposes to generate carbon black and exhaust gas. Injecting feedstock oil from the tail end of the combustion chamber, compared with the traditional method of injecting feedstock oil from the throat, is beneficial to improving the carbon black product structure, and the better the atomization, the more uniform the distribution of the generated carbon black particles.

[0069] The reaction time from carbon black formation to termination is controlled to be 0.25–0.35 seconds, specifically 0.3 seconds. The airflow direction within the reactor is controlled during the carbon black reaction. By rationally selecting processing techniques and controlling key parameters, increasing the carbon black reaction time enhances surface oxidation and introduces oxygen-containing functional groups (such as carboxyl, hydroxyl, and carbonyl groups). This improves the hydrophilicity / polarity of the carbon black surface, enhances its dispersion stability in polymer or aqueous systems, improves interfacial bonding with polar matrices, and enhances the mechanical properties of composite materials. Simultaneously, extended reaction time results in a more developed, dendritic carbon black structure.

[0070] S3. Heat exchange and cooling: The carbon black and flue gas are cooled to within the cooling temperature range. Demineralized water is used instead of tap water for rapid cooling of carbon black during the production process, which effectively improves the purity of carbon black.

[0071] S4. Carbon black collection: After heat exchange and cooling, the carbon black and flue gas are passed into a bag filter to separate the carbon black and exhaust gas; after being collected by the bag filter, the carbon black flue gas enters the slag remover.

[0072] S5. Carbon black slag removal: Impurities in carbon black are separated using a slag remover to obtain pure carbon black. By changing the direction of flue gas flow and the effect of gravity, the heavier impurities in the carbon black fall into the cone, while the carbon black and gas flow out from the outlet, removing foreign substances such as lumps, rust, and slag from the carbon black and improving its purity.

[0073] In some embodiments, refer to Figure 2 The method also includes the following steps:

[0074] S6. Carbon black conveying and storage: Pure carbon black is conveyed to the powder bag filter 53 for dust removal by the powder fan 52. The dust-removed carbon black is then conveyed to the product storage tank through the airtight valve and conveying auger. Unqualified products are conveyed to the unqualified tank 61. After being collected by the bag filter, the carbon black directly enters the product storage tank and is then packaged by the vacuum packaging machine to maintain the original state of the carbon black, thereby ensuring good dispersibility of the carbon black.

[0075] S7. Product packaging and warehousing: Carbon black is packaged and warehoused according to customer requirements.

[0076] The above embodiments of the present invention employ an oil furnace method for preparing carbon black. This method offers advantages such as high yield, low cost, diverse product range, low energy consumption, and high recovery rate. In these embodiments, the feed oil is injected from the tail end of the combustion chamber, which, compared to traditional throat injection, is beneficial for improving the carbon black structure. The embodiments of the present invention utilize a "Π"-shaped reactor, which promotes the dendritic aggregation of the carbon black structure. The product quality of these embodiments has been validated by the market and has reached international advanced levels.

[0077] Reference Figure 6 and Figure 7 As can be seen from the above application tests, the carbon black of this invention has stable quality, low sieve residue, high toluene transmittance, and high purity. Therefore, the conductive carbon black (model LC-327P) prepared in this embodiment can meet the performance requirements of graphite anode slurry for lithium-ion batteries. The carbon black production process of this invention has the advantages of being environmentally friendly, energy-saving, and reducing consumption, while the carbon black prepared can meet the performance requirements of customers.

[0078] In some embodiments, the feedstock oil is injected from the tail end of the combustion chamber in a radial direction along the cross-section of the combustion chamber. The feedstock oil is injected into the combustion chamber through multiple oil lines, and each oil line is arranged at equal intervals along the circumference of the cross-section of the combustion chamber.

[0079] In some embodiments, refer to Figure 4 The fuel injection path for the feedstock oil includes at least three streams. The area before the throat, at the end of the combustion section, is where the energy, direction, and pressure of the high-temperature gas flow change most drastically (sudden contraction). This facilitates intense mixing of the feedstock and the high-temperature gas flow, enhances energy exchange conditions, and accelerates the vaporization of the feedstock hydrocarbons and the formation rate of carbon black nuclei. When the carbon black nuclei and crystals (active groups nC-aromatics) pass through the throat, the small diameter of the throat results in a very small space, leading to a several-fold increase in the density of active groups per unit cross-section (this process occurs in the reaction section when fuel is injected at the throat). This increases the probability of collision, contact, or fusion of active groups, and enhances the spatial and temporal transition conditions for the development of the active group ∑nC-aromatics from 1 to n chain-like dendritic structures, thus improving the structure of the carbon black.

[0080] In some embodiments, during the carbon black reaction step, the reaction time from carbon black formation to termination is controlled by introducing quench water at different locations along the length of the quenching section 14 of the reactor.

[0081] In some embodiments, during the carbon black reaction step, the direction of the airflow inside the reactor is controlled to change from horizontal to vertically upward, then back to horizontal, then back to vertically downward, and finally back to horizontal again, to increase the collision frequency of the nucleation process. Specifically, the airflow direction inside the reactor is Π-shaped. (Refer to...) Figure 5 Current research indicates that carbon black formation involves the following five distinct stages:

[0082] ① The initial reaction is the precursor and beginning of carbon black formation, including the transformation from a molecular system to a particle system.

[0083] ② Nucleation process: crystal nuclei are generated and grow.

[0084] ③ Particle aggregation, under the action of nucleation, generates small particles with a diameter of 1-2 nm through collisions, generating spherical particles with a diameter of 10-50 nm and melting into grape-like units (aggregates).

[0085] ④ Aggregate surface growth: Aggregates or agglomerates on the surface of aggregates, generating chain-like structures with a length of 100–1000 nm.

[0086] ⑤ Oxidation: After carbon black is generated and grows, surface functional groups are formed due to the oxidation process.

[0087] In this embodiment, the Π-shaped design reduces the reaction time of carbon black from generation to termination to approximately 0.3 seconds, significantly longer than that of rubber carbon black and pigment carbon black (0.18 seconds). This facilitates the formation of carbon black aggregates through collisions within the carbon black flue gas, resulting in carbon black agglomerates under van der Waals forces. The increased residence time of these aggregates in the reaction zone provides ample space and time for further development of carbon black into chain dendrites (including secondary structures), thus improving the carbon black's structure. Furthermore, the Π-shaped design alters the airflow direction, increasing the collision frequency during nucleation, which further enhances the carbon black's structure.

[0088] In some embodiments, the feedstock oil includes anthracene oil; the air preheating temperature is 580–620°C, and the feedstock oil preheating temperature is 120–180°C; in the heat exchange and cooling step, the cooling temperature is 230–290°C; specifically, since the normal operating temperature of the carbon black filter bag is ≤260°C, the carbon black flue gas needs to be cooled to 260°C by adding water. Impurities include agglomerated carbon black, rust, and slag.

[0089] In some embodiments, the method for producing conductive carbon black includes:

[0090] (1) Air preheating: 2700 Nm3 / h of air is heated to 589°C by an air preheater and then sent into the reactor.

[0091] (2) Preheating of raw material oil: 790 kg / h of anthracene oil is heated to 140°C by an oil preheater and then sent to the reaction furnace.

[0092] (3) Reaction:

[0093] a. 160 Nm3 / h of natural gas is mixed with heated air and burned in a reactor. The mixture is injected into the reactor at a ratio of air:natural gas = 16.5:1 to produce a high-temperature combustion gas flow of 1900℃.

[0094] b. Anthracene oil heated to 140°C is evenly injected into the high-temperature combustion gas stream from the tail end of the combustion chamber, where it rapidly decomposes to produce carbon black and flue gas.

[0095] c. Insert a ф3.5 water gun into the quenching section of the reactor and spray 683 kg / h of demineralized water axially to reduce the high temperature carbon black flue gas to 750°C and terminate the carbon black reaction; the quenching section has multiple quenching points to adjust the carbon black reaction time.

[0096] (4) The carbon black flue gas generated by the reaction is cooled down by heat exchange through an air preheater and an oil preheater in sequence.

[0097] (5) The carbon black flue gas is cooled to 260°C by heat exchange and enters the main bag filter. The carbon black flue gas is filtered through the bag filter to achieve separation of carbon black and tail gas.

[0098] (6) The separated carbon black is removed by a slag remover, and the slag is discharged from the cone through an airtight valve. The carbon black and gas are sent to the powder bag filter for collection by a blower.

[0099] (7) The collected carbon black is directly fed into the product storage tank through an air-sealed spiral conveyor and then packaged and stored in the warehouse by a vacuum packaging machine.

[0100] Reference Figure 3 The present invention also provides a conductive carbon black production system based on a conductive carbon black production method, including a raw material oil storage device, an air supply device, a natural gas supply device, a reactor, a quench water supply device, and a carbon black filtration and impurity removal device.

[0101] The reactor comprises a combustion section 11, a throat section 12, a reaction section 13, and a residence section 15 connected in sequence; the first section after the throat section 12 is the reaction section 13, followed by the quenching section. From the perspective of carbon black reaction, the part before the water spray quenching all falls within the scope of the reaction section 13.

[0102] The feedstock oil storage device is connected to the tail end of the combustion section 11 and is used to spray the preheated feedstock oil into the tail end of the combustion section 11. The feedstock oil storage device includes a first anthracene oil tank 21 and a second anthracene oil tank 22 that are interconnected. The first anthracene oil tank 21 injects the anthracene oil inside into the second anthracene oil tank 22. The anthracene oil inside the second anthracene oil tank 22 is sprayed into the combustion section after passing through the feedstock oil preheater 24. A small amount of anthracene oil is returned to the second anthracene oil tank 22 through the return oil cooler 23.

[0103] An air supply device is connected to the head of the combustion section 11 and is used to introduce preheated air into the combustion section 11. The air supply device includes a main fan 31 and an air preheater 32. The main fan 31 introduces air into the air preheater 32, which is connected to the residence section 15. The preheated air then enters the combustion section. The air preheater 32 and the feed oil preheater 24 obtain heat through the waste heat boiler 25.

[0104] The natural gas supply unit is connected to the head of the combustion section 11 and is used to introduce natural gas into the combustion section 11.

[0105] The reaction section 13 has a flow direction changing structure, which changes the airflow direction through the flow direction changing structure; the reaction section 13 has multiple quench water inlets spaced apart along its extension direction, and each quench water inlet is connected to a quench water supply device to control the position of the quench water inlet to change the carbon black reaction time.

[0106] The carbon black filtration and impurity removal device is indirectly connected to the residence section 15 and is used to remove flue gas and impurities from the carbon black. The carbon black filtration and impurity removal device includes a main bag filter 41, a reprocessing bag filter 42, and a slag remover 51. After cooling, the carbon black flue gas is passed into multiple main bag filters 41. The carbon black that has had its flue gas removed enters the cooling auger 43 from the bottom of the main bag filter 41. The carbon black collected in the reprocessing bag filter 42 and the carbon black in the cooling auger 43 are conveyed to the slag remover 51. The slag remover 51 removes the waste residue from the carbon black. The powder blower 52 conveys the carbon black in the slag remover 51 to the powder bag filter 53. The qualified carbon black in the powder bag filter 53 is conveyed to the granular material A tank or granular material B tank by the feeding auger 62, and the unqualified carbon black is conveyed to the unqualified tank.

[0107] It should be noted that the quench water includes at least two streams: one stream cools the carbon black flue gas to a temperature suitable for preheating the air, and the other stream cools the carbon black flue gas to a temperature suitable for preheating the feedstock oil.

[0108] In some embodiments, the tail end of the combustion section 11 has multiple raw material inlet channels, the axis of which intersects the axis of the combustion section 11.

[0109] In some embodiments, the flow direction change structure is a Π-shaped structure.

[0110] It should be clarified that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of the present invention.

[0111] In this invention, features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or combined with or in place of features of other embodiments.

[0112] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, various modifications and variations can be made to the embodiments of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for producing conductive carbon black, characterized in that, Includes the following steps: Air and feedstock oil are preheated by the high-temperature flue gas generated in the reactor, so that the air and feedstock reach the preheating temperature. The carbon black reaction involves mixing natural gas and preheated air, which is then introduced into the combustion chamber of the reactor to generate a high-temperature combustion gas stream at a temperature of 1850–1950°C. Preheated feedstock oil is injected from the tail end of the combustion chamber and mixed with the high-temperature combustion gas stream to generate carbon black and flue gas. The reaction time from carbon black generation to termination is controlled to be 0.25–0.35 seconds. The direction of the airflow within the reactor is also controlled during the carbon black reaction. Heat exchange and cooling are used to cool the carbon black and flue gas to below the cooling temperature. Carbon black collection involves passing the cooled carbon black and flue gas through a bag filter to separate the carbon black and exhaust gas. Carbon black slag removal involves separating impurities from carbon black using a slag remover to obtain pure carbon black.

2. The method for producing conductive carbon black according to claim 1, characterized in that, The method further includes the following steps: Carbon black conveying and storage: Pure carbon black is conveyed to a powder bag filter for dust removal by a fan, and the dust-removed carbon black is then conveyed to a product storage tank. Product packaging and warehousing; carbon black packaging and warehousing according to customer requirements.

3. The method for producing conductive carbon black according to claim 1, characterized in that, The feedstock oil is injected from the tail end of the combustion chamber in a radial direction along the cross-section of the combustion chamber. The feedstock oil is injected into the combustion chamber through multiple oil lines, and each oil line is arranged at equal intervals along the circumference of the cross-section of the combustion chamber.

4. The method for producing conductive carbon black according to claim 1, characterized in that, The fuel oil injection path of the feedstock oil includes at least three streams.

5. The method for producing conductive carbon black according to claim 1, characterized in that, In the carbon black reaction step, the reaction time from carbon black generation to termination is controlled by introducing quench water into different parts along the length of the quenching section (14) of the reactor.

6. The method for producing conductive carbon black according to claim 1, characterized in that, In the carbon black reaction step, the direction of the airflow in the reactor is controlled to change from horizontal to vertically upward, then back to horizontal, then back to vertically downward, and then back to horizontal again, in order to increase the collision frequency of the nucleation process.

7. The method for producing conductive carbon black according to claim 1, characterized in that, The feedstock oil includes anthracene oil; the air preheating temperature is 580–620℃, and the feedstock oil preheating temperature is 120–180℃. In the heat exchange and cooling step, the cooling temperature is 230–290°C; Impurities include agglomerated carbon black, rust, and slag.

8. A conductive carbon black production system, based on the conductive carbon black production method of claim 1, characterized in that, It includes a crude oil storage device, an air supply device, a natural gas supply device, a reactor, a quench water supply device, and a carbon black filtration and impurity removal device; The reactor comprises a combustion section (11), a throat section (12), a reaction section (13), and a residence section (15) connected in sequence. The raw material oil storage device is connected to the tail end of the combustion section (11) and is used to inject the preheated raw material oil into the tail end of the combustion section (11). The air supply device is connected to the head of the combustion section (11) and is used to introduce preheated air into the combustion section (11); The natural gas supply device is connected to the head of the combustion section (11) and is used to supply natural gas to the combustion section (11); The reaction section (13) has a flow direction changing structure, which changes the direction of the airflow through the flow direction changing structure; The reaction section (13) has a plurality of quench water inlets spaced apart along its extension direction. Each of the quench water inlets is connected to the quench water supply device to control the position of the quench water inlet to change the carbon black reaction time. The carbon black filtration and impurity removal device is indirectly connected to the residence section (15) and is used to remove flue gas and impurities from the carbon black.

9. The conductive carbon black production system according to claim 8, characterized in that, The tail end of the combustion section (11) has multiple raw material inlet channels, the axis of which intersects the axis of the combustion section (11).

10. The conductive carbon black production system according to claim 8, characterized in that, The flow direction changing structure is a Π-shaped structure.

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