Pelletizing and pre-carbonizing integrated system
By adopting an integrated granulation pre-carbonization system in the production of negative electrode materials, the problems of long process flow, low production efficiency and large energy waste in the existing technology are solved, and continuous production of granulation and pre-carbonization processes are achieved, which improves production capacity and reduces energy consumption.
Patent Information
- Application Number
- CN202422055648.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-23
AI Technical Summary
In the prior art, the granulation and pre-carbonization processes of the negative electrode materials are carried out separately, resulting in a long process flow, low production efficiency, and large energy waste. The granulation and pre-carbonization are both intermittent feeding methods, resulting in high energy consumption, small production capacity, and discontinuous production.
The granulation and pre-carbonization integrated system is adopted. Through the connected granulation area and pre-carbonization area, the granulated materials directly enter the pre-carbonization area without cooling, achieving continuous production of granulation and pre-carbonization processes. The system includes a feed buffer chamber, a feeder, a granulated pre-carbonization kiln, a purifier and a hot air furnace. The hot air furnace is used to heat the hot flue gas generated by the combustion of the volatile gas released by the raw material itself, achieving zero fuel consumption.
The continuous production of granulation and pre-carbonization processes has been achieved, with large production capacity and low energy consumption, meeting the capacity scale and cost requirements of future power and large-scale energy storage.
Smart Images
Figure CN223020862U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of negative electrode material production, in particular to a granulation and pre-carbonization integrated system. Background Art
[0002] The core processes of graphite negative electrode material production include raw material drying, crushing, shaping, batching, granulation, pre-carbonization, graphitization, high-temperature carbonization, screening, demagnetization, etc. Among them, the granulation process is to add asphalt to single-particle coke powder raw materials or use the bituminous substances contained in the coke powder itself to polymerize at a higher temperature to produce secondary particles, so as to achieve the isotropy of the negative electrode material particles, reduce the electrochemical expansion of the negative electrode material, and improve the rate performance and cycle performance of the battery. After granulation, the raw material has a low tapped density and contains a large amount of volatile components, resulting in a low raw material charging amount in the subsequent graphitization process and a high unit power consumption. To increase the charging amount, usually after the raw material granulated in the reaction kettle is cooled, it is then heated in a high-temperature furnace such as a tunnel kiln for pre-carbonization to remove volatile components and increase the tapped density. The common process flow is: heating, granulation, cooling - heating, pre-carbonization, cooling. After granulation in this process, it is cooled and then reheated, with a long process, low production efficiency, and large energy waste. Currently, the granulation and pre-carbonization processes of the mainstream negative electrode materials in the market are carried out separately, that is, after the raw material is granulated at about 650 °C, it is cooled to room temperature; then the furnace type is changed, such as a tunnel kiln, and then heated to about 1000 °C to complete pre-carbonization, and then cooled. Due to the traditional equipment, granulation and pre-carbonization are both carried out step by step separately, with a long and complex process flow, serious resource waste, and both granulation and pre-carbonization are intermittent feeding methods, resulting in high energy consumption, small production capacity, and discontinuous production in the prior art. Summary of the Utility Model
[0003] In order to improve at least some of the above-mentioned disadvantages or deficiencies, an embodiment of the utility model provides a granulation and pre-carbonization integrated system.
[0004] Specifically, a granulation pre-carbonization integrated system provided by an embodiment of the present utility model includes: a feed buffer bin; a feeder connected to the feed buffer bin; a granulation pre-carbonization integrated kiln with a feed inlet and a discharge outlet respectively provided at two ends. The granulation pre-carbonization integrated kiln includes a granulation area and a pre-carbonization area that are communicated. The granulation area is communicated with the feed inlet, the pre-carbonization area is communicated with the discharge outlet, and the feeder is connected to the feed inlet. Among them, the granulation area includes a plurality of adjacent temperature zones; a purifier connected to the granulation pre-carbonization integrated kiln, and the purifier is used to purify the coke powder or carbon powder mixed in the organic gas volatilized from the raw material during granulation and pre-carbonization; and a hot blast stove with one end connected to the purifier and the other end connected to one end of the pre-carbonization area close to the discharge outlet, and one end of the pre-carbonization area far from the discharge outlet is connected with a plurality of hot air inlets that are sequentially communicated. The plurality of hot air inlets are respectively connected to the plurality of temperature zones one by one. The hot blast stove is used to heat the organic gas to generate hot flue gas and transport the hot flue gas to the pre-carbonization area and the plurality of temperature zones according to different flow rates to heat the granulation pre-carbonization integrated kiln.
[0005] In an embodiment of the present utility model, the granulation pre-carbonization integrated kiln includes: an outer kiln body with a plurality of partition members spaced apart therein, and the partition members are provided with cylinder installation holes; a granulation pre-carbonization kiln cylinder disposed in the outer kiln body and passing through the cylinder installation holes. A furnace body is formed between the outer kiln body and the granulation pre-carbonization kiln cylinder. The plurality of partition members divide the furnace body into a plurality of sub-furnace bodies, and the plurality of sub-furnace bodies respectively correspond to the plurality of temperature zones and the pre-carbonization area. The plurality of hot air inlets are respectively connected to the plurality of sub-furnace bodies one by one; a burner is disposed around the outer surface of the granulation pre-carbonization kiln cylinder, and the burner is used to heat the granulation pre-carbonization kiln cylinder.
[0006] In an embodiment of the present utility model, the plurality of temperature zones include a preheating temperature zone, a medium temperature zone, and a high temperature zone arranged in sequence from the feed inlet to the discharge outlet. The temperature of the preheating temperature zone is 25~400 °C, the temperature of the medium temperature zone is 400~600 °C, and the temperature of the high temperature zone is 600~700 °C.
[0007] In an embodiment of the present utility model, each hot air inlet is provided with a flow control valve to control the flow rate of the hot flue gas input into each sub-furnace body; there are a plurality of burners, and at least one burner is correspondingly arranged in each temperature zone and the pre-carbonization area.
[0008] In an embodiment of the present utility model, a receiving cavity is formed inside the granulation pre-carbonization kiln barrel. The granulation area and the pre-carbonization area are located inside the receiving cavity, and a barrel feeder is arranged inside the receiving cavity. The granulation pre-carbonization kiln barrel can rotate to convey the raw material from the feed port towards the discharge port.
[0009] In an embodiment of the present utility model, the granulation area and the pre-carbonization area are arranged along the axis of the granulation pre-carbonization kiln barrel, and the granulation pre-carbonization kiln barrel is inclined relative to the horizontal line. The axis of the granulation pre-carbonization kiln barrel forms an angle with the horizontal line, and the range of the angle is 0 to 5°.
[0010] In an embodiment of the present utility model, multiple groups of first scraping plate mechanisms are arranged at intervals along the axial direction on the inner wall of the granulation area of the granulation pre-carbonization kiln barrel. The first scraping plate mechanism includes multiple first scraping plates. The multiple first scraping plates are arranged at intervals and annularly on the inner wall of the granulation area. One end of the first scraping plate is fixedly connected to the inner wall of the granulation area, and the other end extends towards the center direction of the receiving cavity. Moreover, the first scraping plate is inclined relative to the radial direction of the receiving cavity.
[0011] In an embodiment of the present utility model, the inclination direction of the first scraping plate is opposite to the rotation direction of the granulation pre-carbonization kiln barrel, and the range of the angle between the first scraping plate and the radial direction is 15 to 25°.
[0012] In an embodiment of the present utility model, multiple groups of second scraping plate mechanisms are arranged at intervals along the axial direction on the inner wall of the pre-carbonization area of the granulation pre-carbonization kiln barrel. The second scraping plate mechanism includes multiple second scraping plates. The multiple second scraping plates are arranged at intervals and annularly on the inner wall of the pre-carbonization area. One end of the second scraping plate is fixedly connected to the inner wall of the pre-carbonization area, and the other end extends along the radial direction of the receiving cavity. Moreover, the range of the angle between the second scraping plate and the radial direction is 0 to 5°.
[0013] In an embodiment of the present utility model, the width of the first scraping plate in the radial direction is greater than the width of the second scraping plate in the radial direction. The width of the first scraping plate is 7.5% to 10% of the barrel diameter, and the width of the second scraping plate is 3% to 5% of the barrel diameter.
[0014] As can be seen from the above, the above technical features of the present utility model can have one or more of the following beneficial effects:
[0015] 1) The granulation pre-carbonization integrated system provided in this embodiment realizes continuous production of the granulation and pre-carbonization processes with large production capacity and significantly reduced energy waste, meeting the production capacity scale and cost requirements of future power and large-scale energy storage by setting up a feed buffer bin, a feeder, a granulation pre-carbonization integrated kiln, a purifier, and a hot blast stove, and setting the granulation pre-carbonization integrated kiln as a connected granulation area and pre-carbonization area, so that the granulated material directly enters the pre-carbonization area without cooling.
[0016] 2) In the granulation area and the pre-carbonization area, lifters with different angles and heights are set according to their respective functional purposes to achieve better granulation and pre-carbonization effects. During the operation of the material from the granulation area to the pre-carbonization area, it synchronously rises along the cylinder wall with the rotation of the cylinder body; due to its own weight, the material will automatically roll down to the bottom of the cylinder after rising to a certain height. In the granulation area, as the temperature gradually rises, the asphalt added to the single-particle coke powder raw material or the asphalt contained in the coke powder itself binds the particles to achieve granulation; in this case, by setting lifters with a relatively high height in the radial direction of the cylinder body and the inclination direction of the lifters being opposite to the rotation direction of the cylinder body, the lifting height of the material and the rolling distance of the material are extended, thereby achieving a better granulation effect. In the pre-carbonization area, as the temperature gradually rises, the granulated material directly enters the pre-carbonization area without cooling to remove volatile components and improve the tapped density; in this case, by setting lifters with a relatively low height in the radial direction of the cylinder body and the lifters being basically perpendicular to the cylinder body to ensure that the material is turned over and not lifted, since the temperature of the cylinder wall is more than 100 degrees higher than the temperature of the gas at the axis of the cylinder body, a better effect of removing volatile components can be achieved through this setting.
[0017] 3) By setting up the hot blast stove, the hot flue gas generated by burning the volatile gas released by the raw material itself is used to supply heat to the granulation pre-carbonization integrated kiln, so that zero fuel consumption can be achieved.
[0018] 4) The hot flue gas is introduced into multiple sub-furnace bodies through air ducts to enter different temperature zones; the flow rate of the hot flue gas input into each temperature zone is controlled by a flow control valve, so as to achieve the temperature difference between the temperatures and control the heating curve of the material.
[0019] 5) Burners are set in each temperature zone to preheat the furnace body at the start of production and as a supplement when the heat generated by the combustion of volatile components is not sufficient to ensure reaching the preset temperature. Description of the Drawings
[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0021] Figure 1 This is a schematic structural diagram of a granulation and pre-carbonization integrated system provided by an embodiment of the present utility model.
[0022] Figure 2 For Figure 1 This is a schematic structural diagram of the granulation and pre-carbonization integrated kiln.
[0023] Figure 3 This is a schematic cross-sectional structure diagram of the granulation area of the granulation and pre-carbonization kiln cylinder.
[0024] Figure 4 This is a schematic cross-sectional structure diagram of the pre-carbonization area of the granulation and pre-carbonization kiln cylinder.
[0025] Main component numbers:
[0026] 10. Feed buffer bin; 20. Feeder; 30. Granulation and pre-carbonization integrated kiln; 31. Granulation area; 32. Pre-carbonization area; 301. Feed inlet; 302. Discharge outlet; 310. Granulation and pre-carbonization kiln cylinder; 320. Outer kiln body; 311. Sub-kiln body; 313. Accommodation cavity; 330. Cylinder feeder; 350. First baffle; 360. Second baffle; 40. Purifier; 50. Hot blast stove; 51. Hot air inlet; 52. Exhaust gas outlet; 60. Cooling kiln; 70. Burner; 80. Flue gas treatment system. Specific embodiments
[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0028] See Figure 1 and Figure 2 A granulation and pre-carbonization integrated system provided by an embodiment of the present utility model may, for example, include: a feed buffer bin 10, a feeder 20, a granulation and pre-carbonization integrated kiln 30, a purifier 40, and a hot blast stove 50.
[0029] The feeding buffer bin 10 is used to buffer raw coke powder or a uniform mixture of coke powder and pitch. For example, a discharge port may be provided at the lower part of the feeding buffer bin 10. The feeding buffer bin 10 is connected to the feeder 20 through the discharge port. By setting the discharge port, the entry of air into the granulation and pre-carbonization integrated kiln 30 can be reduced, and nitrogen can be introduced into the feeding buffer bin 10 and the feeder 20, for example. Feed inlets 301 and discharge outlets 302 may be respectively provided at both ends of the granulation and pre-carbonization integrated kiln 30, for example. The granulation and pre-carbonization integrated kiln 30 may, for example, include a connected granulation area 31 and a pre-carbonization area 32. The granulation area 31 is communicated with the feed inlet 301, and the pre-carbonization area 32 is communicated with the discharge outlet 302. The feeder 20 is connected to the feed inlet 301 and may, for example, extend into the granulation area 31. The feeder 20 may, for example, be a screw feeding mechanism. The feeder 20 is used to convey the raw materials in the feeding buffer bin 10 into the granulation and pre-carbonization integrated kiln 30. The granulation and pre-carbonization integrated kiln 30 is used for continuous granulation and pre-carbonization treatment of the raw materials.
[0030] The granulation area 31 may, for example, include a plurality of adjacent temperature zones. In an implementation manner of this embodiment, the plurality of temperature zones may, for example, include a preheating temperature zone, a medium temperature zone, and a high temperature zone arranged in sequence from the feed inlet 301 to the discharge outlet 302. The temperature of the preheating temperature zone is 25 - 400 °C, the temperature of the medium temperature zone is 400 - 600 °C, and the temperature of the high temperature zone is 600 - 700 °C. In an implementation manner of this embodiment, the length of each temperature zone may, for example, be 2.5 meters. Of course, this is not limiting. The temperature range of the pre-carbonization area 32 is, for example, 900 - 1150 °C. The feeder 20 may, for example, extend into the preheating temperature zone.
[0031] The purifier 40 is connected to the granulation and pre-carbonization integrated kiln 30. Organic gases are generated during the processes of granulating and pre-carbonizing the raw materials in the granulation and pre-carbonization integrated kiln 30. The generated organic gases are transported into the purifier 40. The purifier 40 is used to purify the coke powder or carbon powder mixed in the organic gases volatilized from the raw materials during the granulation and pre-carbonization processes. The separated coke powder or carbon powder can be recycled and reused. One end of the hot blast stove 50 is connected to the purifier 40, and the other end is provided with a hot air inlet 51, for example. The hot air inlet 51 is connected to one end of the pre-carbonization area 32 close to the discharge port 302, and one end of the pre-carbonization area 32 far from the discharge port 302 is connected to a plurality of sequentially connected hot air inlets 51. The plurality of hot air inlets 51 are respectively connected to the plurality of temperature zones one by one. The hot blast stove 50 is used to heat the organic gases to generate hot flue gas, and transport the hot flue gas to the pre-carbonization area and the plurality of temperature zones according to different flow rates to heat the granulation and pre-carbonization integrated kiln. Specifically, the hot flue gas heated by the hot blast stove 50 can be, for example, first transported to the pre-carbonization area 32, and after being heated by surrounding the pre-carbonization area 32, it can be output to the adjacent plurality of temperature zones through the plurality of sequentially connected hot air inlets 51. The hot flue gas passing through the pre-carbonization area 32 has a higher temperature. After heating the pre-carbonization area 32 first, the temperature of the hot flue gas decreases, and then it is input to the preheating temperature zone, the medium temperature zone, and the high temperature zone. The heating temperature is controlled by controlling the flow rate of the hot flue gas entering the preheating temperature zone, the medium temperature zone, and the high temperature zone.
[0032] The granulation and pre-carbonization integrated system provided in this embodiment realizes continuous production of the granulation and pre-carbonization processes with large production capacity and meets the production capacity scale for future power and large-scale energy storage by setting the feeding buffer bin 10, the feeder 20, the granulation and pre-carbonization integrated kiln 30, the purifier 40, and the hot blast stove 50, and by setting the granulation and pre-carbonization integrated kiln 30 as the connected granulation area 31 and pre-carbonization area 32. Through the setting of the hot blast stove 50, the hot flue gas generated by burning the volatile gases released by the raw materials themselves is used to heat the granulation and pre-carbonization integrated kiln 30, so that zero fuel consumption can be achieved.
[0033] Further, the granulation and pre-carbonization integrated kiln 30 can include, for example, an outer kiln body 320, a granulation and pre-carbonization kiln barrel 310, and a burner 70. A plurality of partition members are arranged at intervals in the outer kiln body 320, and barrel mounting holes are provided on the partition members. The granulation and pre-carbonization kiln barrel 310 is arranged in the outer kiln body 320 and passes through the barrel mounting holes. A furnace body is formed between the outer kiln body 320 and the granulation and pre-carbonization kiln barrel 310. The plurality of partition members divide the furnace body into a plurality of sub-furnace bodies 311. The plurality of sub-furnace bodies 311 correspond to the plurality of temperature zones and the pre-carbonization area 32 one by one. The plurality of hot air inlets 51 are respectively connected to the plurality of sub-furnace bodies 311 one by one. Through the setting of the plurality of sub-furnace bodies 311, the plurality of sub-furnace bodies 311 can be heated separately by the hot blast stove 50 to realize the temperature control of different temperature zones and the pre-carbonization area 32. SeeFigure 3 and Figure 4 The burner 70 can be disposed, for example, around the outer surface of the granulation pre-carbonization kiln cylinder 310. The burner 70 is used to heat the granulation pre-carbonization kiln cylinder 310. The burner 70 can assist in heating the granulation pre-carbonization kiln cylinder 310. When the heating temperature by hot flue gas is insufficient, the burner 70 can be used for auxiliary heating to ensure the temperature of the granulation pre-carbonization kiln cylinder 310.
[0034] In an implementation manner of this embodiment, each hot air inlet 51 can be provided with a flow control valve, for example. The flow control valve can be used to control the flow rate of the hot flue gas input into each sub-furnace body 311, so as to further control the temperature of different temperature zones and the temperature of the pre-carbonization area 32. The burner 70 can also include multiple burners, for example. At least one burner 70 is correspondingly arranged for each temperature zone and the pre-carbonization area 32, that is, one or more burners 70 can be correspondingly arranged for each temperature zone and the pre-carbonization area 32, for example. Specifically, it can be set according to actual needs, and this embodiment is not limited thereto.
[0035] See again Figure 2 and Figure 3 A receiving cavity 313 is further formed in the granulation pre-carbonization kiln cylinder 310. The granulation area 31 and the pre-carbonization area 32 are located in the receiving cavity 313. A cylinder feeder 330 is arranged in the receiving cavity 313. The granulation pre-carbonization kiln cylinder 310 can rotate. Through the rotation of the granulation pre-carbonization kiln cylinder 310 and the arrangement of the cylinder feeder 330, the raw materials can be conveyed from the feed inlet 301 towards the discharge outlet 302 to ensure the movement of the raw materials in the granulation pre-carbonization kiln cylinder 310. Specifically, the granulation area 31 and the pre-carbonization area 32 are arranged along the axis of the granulation pre-carbonization kiln cylinder 310, and the granulation pre-carbonization kiln cylinder 310 is inclined relative to the horizontal line. The axis of the granulation pre-carbonization kiln cylinder 310 forms an angle with the horizontal line, and the range of the angle is 0 to 5°. The inclination angle of the granulation pre-carbonization kiln cylinder 310 can be adjusted according to actual needs.
[0036] See Figure 3, a plurality of groups of first scraper mechanisms are arranged at intervals along the axial direction on the inner wall of the granulation area 31 of the granulation pre-carbonization kiln cylinder 310. Each group of first scraper mechanisms may include, for example, a plurality of first scrapers 350. The plurality of first scrapers 350 are arranged at intervals in a ring on the inner wall of the granulation area 31. One end of the first scraper 350 is fixedly connected to the inner wall of the granulation area 31, and the other end extends towards the center direction of the accommodating cavity 313. And the first scraper 350 is inclined with respect to the radial direction of the accommodating cavity 313. In this embodiment, the inclination direction of the first scraper 350 is opposite to the rotation direction of the granulation pre-carbonization kiln cylinder 310, and the included angle range between the first scraper 350 and the radial direction is 15° to 25°. Through the arrangement of the first scraper 350, the first scraper 350 is characterized by its long length and having an angle with the radial direction, which can lift the raw materials towards the top end of the granulation pre-carbonization kiln cylinder 310 during the rotation of the granulation pre-carbonization kiln cylinder 310, thereby realizing the extension of the rolling trajectory of the raw materials in the granulation pre-carbonization kiln cylinder 310, improving the granulation effect and efficiency, improving the compactness of the granulation, and at the same time making the raw materials heat evenly driven by the first scraper 350.
[0037] See Figure 4 , a plurality of groups of second scraper mechanisms are arranged at intervals along the axial direction on the inner wall of the pre-carbonization area 32 of the granulation pre-carbonization kiln cylinder 310. Each second scraper mechanism may include, for example, a plurality of second scrapers 360. The plurality of second scrapers 360 are arranged at intervals in a ring on the inner wall of the pre-carbonization area 32. One end of the second scraper 360 is fixedly connected to the inner wall of the pre-carbonization area 32, and the other end extends along the radial direction of the accommodating cavity 313. And the included angle range between the second scraper 360 and the radial direction is 0° to 5°. Through the arrangement of the second scraper 360, the second scraper 360 is characterized by its short length and a relatively small included angle with the radial direction, which can make the raw materials mix more evenly. And because the temperature of the cylinder wall is much higher than the temperature at the center of the cylinder body, the second scraper 360 makes the raw materials contact the cylinder wall as much as possible, which can accelerate the volatilization of volatile components.
[0038] Further, the width of the first scraper 350 in the radial direction is greater than the width of the second scraper 360 in the radial direction. The width of the first scraper 350 is 7.5% - 10% of the diameter of the cylinder, and the width of the second scraper 350 is 3% - 5% of the diameter of the cylinder. In an embodiment of this embodiment, the width of the first scraper 350 can be, for example, 150 mm, and the width of the second scraper 360 can be, for example, 100 mm. Through such a setting, the large width dimension of the first scraper 350 can better scoop up the raw materials and let them fall from a high place, making the mixing more uniform and the granulation effect better. The small width setting of the second scraper 360 can make the raw materials closer to the inner wall of the cylinder. Since the temperature of the inner wall of the cylinder is higher than the temperature at the center of the accommodation cavity of the cylinder, when the raw materials are close to the inner wall of the cylinder, it can make the volatile components in the raw materials volatilize more cleanly and thoroughly, and the pre-carbonization effect is better. In this embodiment, the lengths of the first scraper 350 and the second scraper 360 in the axial direction can be the same or different. For example, the lengths of the first scraper 350 and the second scraper 360 in the axial direction are, for example, 250 mm. Of course, this embodiment is not limited thereto.
[0039] To facilitate a clearer understanding of the working process of the granulation and pre-carbonization integrated system provided by the embodiments of the present invention, the working process of the granulation and pre-carbonization integrated system provided by this embodiment will be described below.
[0040] The production process of the granulation and pre-carbonization integrated system is as follows:
[0041] The burner 70 heats the granulation and pre-carbonization kiln cylinder 310 and keeps it at a preset temperature after heating. The burner 70 heats the hot blast stove to a preset temperature and then keeps it warm. Nitrogen is introduced into the feed buffer bin 10 and the feeder 20 to displace the air. The raw material negative electrode material coke powder or a uniform mixture of coke powder and pitch powder is sent into the feed buffer bin 10, and the feeder 20 at the lower part of the feed buffer bin 10 controls the speed of the raw materials entering the cylinder feeder 330, and then the cylinder feeder 330 conveys the raw materials into the granulation and pre-carbonization kiln cylinder 310. Since the first scraper 350 in the granulation area 31 of the granulation and pre-carbonization kiln cylinder 310 has a certain slope; since the granulation and pre-carbonization kiln cylinder 310 can rotate continuously, the raw materials continuously move in the granulation and pre-carbonization kiln cylinder 310 at a set speed, such as rotation. The first scraper 350 can scoop up the raw materials at the bottom of the granulation and pre-carbonization kiln cylinder 310 and rotate them to the upper middle part of the cylinder, and then under the action of gravity, let the raw materials at the upper middle part fall down, gradually completing the granulation work. In this way, the granulation raw materials can be mixed more evenly and the granulation effect is better. At the same time, the volatile components of the raw materials decompose during the high-temperature heating process, generating a small amount of volatile gas, which moves towards the discharge port 302.
[0042] After that, the raw materials roll forward in the granulation pre-carbonization kiln cylinder 310 and gradually enter the accommodation cavity 313 of the pre-carbonization area 32. Since the temperature of the pre-carbonization area 32 is relatively high, most of the volatile components of the raw materials decompose during the high-temperature heating process. The generated volatile gas is sent into the hot blast stove 50 through the purifier 40 at the discharge port 302 for combustion. The hot flue gas generated by the combustion enters the sub-furnace body 311 to heat the granulation pre-carbonization kiln cylinder 310, realizing indirect heating of the anode material coke powder. The hot flue gas moves in the furnace body from the discharge port 302 towards the feed port 301 after entering the furnace body. The movement direction of the raw materials is opposite to that of the hot flue gas. The hot flue gas heats the cylinder and conducts the heat to the raw materials in the granulation pre-carbonization kiln cylinder 310 to achieve heat exchange. The flue gas after heat exchange is discharged along the waste gas outlet 52 at the position of the feed port 301. The volatile components of the raw materials decompose during the high-temperature heating process, and the generated volatile gas enters the tail gas treatment after passing through the waste heat utilization flue gas treatment system 80. The waste heat is used to heat the air for combustion assistance or raw material drying. The main heating method of the granulation and pre-carbonization integrated system is indirect heat exchange between the high-temperature flue gas generated by the combustion of the volatile gas in the anode raw materials and the anode material petroleum coke powder in the granulation and pre-carbonization integrated kiln 30. After the volatile components of the raw materials decompose during the high-temperature heating process, the generated volatile gas is subjected to gas-solid separation through the purifier 40. The solid can be returned to the kiln, for example, and the gas is sent into the hot blast stove 50 for combustion. The hot flue gas generated by the combustion enters the furnace body to heat the granulation pre-carbonization kiln cylinder 310 and indirectly heat the anode material petroleum coke powder. The higher the volatile content in the raw materials, the more heat is generated by the combustion of the volatile components generated by the raw materials themselves, and the entire system can achieve zero energy consumption other than the mechanical operation power consumption. In this way, the energy utilization rate is greatly improved and the cost is saved. After that, the pre-carbonized raw materials can be transported to the cooling kiln 60 through a conveyor, for example, to obtain the finished raw materials after cooling.
[0043] In addition, it can be understood that the foregoing various embodiments are only exemplary descriptions of the present invention. On the premise that the technical features do not conflict, the structures are not contradictory, and the invention purpose of the present invention is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used.
[0044] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in electrical, mechanical, or other forms.
[0045] The unit described as a separating component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A granulation pre-carbonization integrated system, characterized in that: include: Feed buffer bin; A feeder connected to the feed buffer bin; A granulation pre-carbonization integrated kiln, with a feed port and a discharge port respectively arranged at both ends, the granulation pre-carbonization integrated kiln comprises a granulation area and a pre-carbonization area connected, the granulation area is connected to the feed port, the pre-carbonization area is connected to the discharge port, and the feeder is connected to the feed port, wherein the granulation area comprises a plurality of temperature zones arranged adjacent to each other; A purifier connected to the granulation and pre-carbonization integrated kiln, the purifier is used to purify coke powder or carbon powder mixed in the organic gas volatilized from the raw materials during the granulation and pre-carbonization process; and A hot air furnace, one end of which is connected to the purifier, and the other end of which is connected to an end of the pre-carbonization area close to the discharge port, and an end of the pre-carbonization area away from the discharge port is connected to a plurality of hot air input ports which are connected in sequence, and the plurality of hot air input ports are respectively connected to a plurality of the temperature zones in a one-to-one correspondence. The hot air furnace is used to heat the organic gas to generate hot flue gas, and transport the hot flue gas to the pre-carbonization area and the plurality of temperature zones at different flow rates to heat the granulation pre-carbonization integrated kiln.
2. The integrated granulation and pre-carbonization system according to claim 1, characterized in that: The granulation pre-carbonization integrated kiln comprises: An outer kiln body, wherein a plurality of partitions are arranged at intervals in the outer kiln body, and the partitions are provided with barrel mounting holes; A granulation pre-carbonization kiln cylinder is arranged in the outer kiln body and passes through the cylinder installation hole. A furnace body is formed between the outer kiln body and the granulation pre-carbonization kiln cylinder. The plurality of partitions divide the furnace body into a plurality of sub-furnace bodies. The plurality of sub-furnace bodies correspond to the plurality of temperature zones and the pre-carbonization zones one by one. The plurality of hot air inlets are respectively connected to the plurality of sub-furnace bodies one by one. The burner is arranged around the outer surface of the granulation pre-carbonization kiln cylinder, and the burner is used to heat the granulation pre-carbonization kiln cylinder.
3. The integrated granulation and pre-carbonization system according to claim 2, characterized in that: The multiple temperature zones include a preheating temperature zone, a medium temperature zone and a high temperature zone arranged in sequence from the feed port to the discharge port. The temperature of the preheating temperature zone is 25~400℃, the temperature of the medium temperature zone is 400~600℃, and the temperature of the high temperature zone is 600~700℃.
4. The integrated granulation and pre-carbonization system according to claim 3, characterized in that: Each of the hot air input ports is provided with a flow control valve to control the flow of hot flue gas input into each of the sub-furnace bodies; the burners include a plurality of burners, and each of the temperature zones and the pre-carbonization zone is provided with at least one burner.
5. The integrated granulation and pre-carbonization system according to claim 2, characterized in that: A containing cavity is formed in the cylinder of the granulation pre-carbonization kiln, the granulation area and the pre-carbonization area are located in the containing cavity, and a cylinder feeder is arranged in the containing cavity. The cylinder of the granulation pre-carbonization kiln can rotate to transport the raw materials from the feed port toward the discharge port.
6. The integrated granulation and pre-carbonization system according to claim 5, characterized in that: The granulation area and the pre-carbonization area are arranged along the axis of the granulation pre-carbonization kiln cylinder, and the granulation pre-carbonization kiln cylinder is inclined relative to the horizontal line. The axis of the granulation pre-carbonization kiln cylinder and the horizontal line have an angle, and the angle ranges from 0 to 5 degrees.
7. The integrated granulation and pre-carbonization system according to claim 6, characterized in that: A plurality of first copying plate mechanisms are arranged on the inner wall of the granulation area of the granulation pre-carbonization kiln cylinder at intervals along the axial direction, the first copying plate mechanism comprises a plurality of first copying plates, the plurality of first copying plates are arranged on the inner wall of the granulation area at intervals, one end of the first copying plate is fixedly connected to the inner wall of the granulation area, the other end extends toward the center direction of the accommodating cavity, and the first copying plate is arranged obliquely relative to the radial direction of the accommodating cavity.
8. The integrated granulation and pre-carbonization system according to claim 7, characterized in that: The inclination direction of the first lifting plate is opposite to the rotation direction of the granulation pre-carbonization kiln cylinder, and the angle between the first lifting plate and the radial direction is in the range of 15-25 degrees.
9. The integrated granulation and pre-carbonization system according to claim 7 or 8, characterized in that: A plurality of groups of second copying plate mechanisms are arranged on the inner wall of the pre-carbonization area of the granulation pre-carbonization kiln cylinder at intervals along the axial direction, and the second copying plate mechanism includes a plurality of second copying plates, and the plurality of second copying plates are arranged on the inner wall of the pre-carbonization area at intervals, one end of the second copying plate is fixedly connected to the inner wall of the pre-carbonization area, and the other end extends along the radial direction of the accommodating cavity, and the angle between the second copying plate and the radial direction is in the range of 0-5°.
10. The integrated granulation and pre-carbonization system according to claim 9, characterized in that: The width of the first copying plate in the radial direction is greater than the width of the second copying plate in the radial direction. The width of the first copying plate is 7.5% to 10% of the diameter of the cylinder, and the width of the second copying plate is 3% to 5% of the diameter of the cylinder.