Process and system for pelletizing and recycling carbon product roasting filling coke waste powder

Abstract

The invention relates to a carbon product roasting filling coke waste powder pelletizing recycling process, which comprises the following steps: S1, weighing and proportioning: collecting travelling crane dust collection waste powder generated in the operation of a carbon roasting system or asphalt smoke-containing waste powder generated after the dust collection powder is utilized by a black method to obtain waste coke powder; the invention relates to the technical field of carbon product production. According to the carbon product roasting filling coke waste powder pelletizing reutilization process, production consumption is reduced, resources are recycled, filling coke consumption of each ton of carbon blocks accounts for a certain proportion of cost consumption, burning loss is caused, dust generated in the production process is two main factors for generation of filling coke waste powder, and the production cost is reduced. Wherein the dust generated in the production process is used for making balls, so that the consumption can be effectively reduced, and resources can be recycled.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon product production, and specifically to a process and system for recycling carbon product roasting filling coke waste powder by pelletizing. Background Art

[0002] Roasting is a process of subjecting green carbon blocks to oxygen-free high-temperature treatment to convert the coal tar pitch in the green carbon products into coke and tightly connect the aggregates into a whole. The filling material is a filling material used to cover the green billets and fill the gaps during roasting to prevent the green billets from oxidation and deformation. The performance requirements of the filling material mainly include: good high-temperature stability, small high-temperature deformation, thermal conductivity, air permeability, particle size (mostly 6-8 mm, less fine powder), low moisture content (<1%), pollution-free materials, low cost, etc.

[0003] ① (After the filling material in bulk is extruded by external force and damaged by high temperature during furnace charging, a certain amount of residual fine coke powder is generated in the roasting furnace after the products are discharged. It is collected by the dust collection overhead crane above the roasting furnace and treated as solid waste) ② (The green carbon products contain asphalt binders. The volatile components in the asphalt are released during pre-roasting. A part of the released volatile components will participate in combustion with the combustion environment of the roasting furnace flue channels, generating a certain amount of heat energy, which becomes the energy required for roasting processing. The unburned volatile components and soot form asphalt fumes, which enter the flue gas purification system for purification. At present, there is an environmental protection process that uses the residual fine coke powder collected by the dust collection overhead crane above the roasting furnace to adsorb the asphalt fumes. The coke powder adsorbs and purifies the asphalt fumes, and then the adsorbed coke powder is intercepted and collected by a bag filter for cyclic adsorption use. However, after several adsorption cycles, the microporous structure of the adsorbed coke powder is gradually filled, and the viscosity of the coke powder gradually increases, and it no longer has the adsorption function and finally exits the adsorption purification system.) Such materials are easily judged as hazardous wastes due to the condensation of tar adsorbed by the asphalt fumes and are also used as raw materials for pelletizing and recycling.

[0004] There are significant technical defects in the traditional treatment methods for the filled coke waste powder generated during the baking process of carbon products (mainly including dust collected by traveling cranes, waste powder after black method utilization, etc.): On the one hand, the existing processes have a low recovery rate for waste powder with high ash content (such as 38%), and landfill disposal is likely to cause environmental pollution and waste of resources; on the other hand, it is difficult for conventional ball-making methods to balance the thermal strength and thermal conductivity of products, and the recycled materials are prone to structural collapse during the operation of the baking system, unable to meet the original physical and chemical index requirements of metallurgical coke. Especially when the waste powder contains complex oil and carbon components, ordinary binder formulations are likely to result in a low yield, and the thermal conductivity after ball-making (about 0.21 W / (m·k) for traditional recycled materials) is difficult to meet the requirements of the baking process. In addition, there is generally a risk of secondary dust pollution in the existing systems, high energy consumption in the drying link, uncirculated use of hydrothermal resources, high breakage rate in the conveying link, and insufficient automation leading to a sharp increase in labor costs. It is urgent to develop a waste powder recycling system with closed-loop clean production, adaptive formula control, high-pressure forming, and coordinated optimization of thermal engineering to break through the technical bottleneck of solid waste resource utilization in the carbon industry.

[0005] The common disposal method for general solid waste dust collected as the first case of disposal materials is usually to transport it to the power plant for incineration by a filling truck. However, the calorific value of coke powder is too low and the recovery value is extremely small. For hazardous solid waste as the second case of disposal materials, it faces even more problems such as high disposal costs and difficult recovery technologies. Therefore, a ball-making and recycling process for the filled coke waste powder from the baking of carbon products is proposed. The dust collected is pressed into balls to meet the requirements of the thermal conductivity and thermal strength of the filler, and the cost savings in purchasing metallurgical coke every year are extremely significant. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a ball-making and recycling process for the filled coke waste powder from the baking of carbon products, which solves the problems mentioned above.

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A ball-making and recycling process for the filled coke waste powder from the baking of carbon products, including the following steps: S1. Weighing and batching: Collect the dust collected by traveling cranes and the waste powder after black method utilization generated during the operation of the carbon baking system, conduct quantitative proportioning according to the set weight, and stop batching respectively according to the set signals to provide basic materials for subsequent mixing; This step precisely weighs the waste coke powder, binder, and water according to the preset formula ratio and transports them to the mixing and stirring equipment to provide initial materials for subsequent mixing. The coke powder is the main component, the binder helps the materials maintain their shape during the forming process, and an appropriate amount of water helps the binder play its role; S2. Mixing and Stirring: The coke powder, binder, and water output according to the set amount of the weighing and batching system enter the stirring system. According to the set sequence and time, through the stirring equipment, ensure that various components are evenly distributed to form a uniform mixture, which is the batching process. In this step, the coke powder is fully mixed with materials such as the binder and water. Through the stirring equipment, ensure that various components are evenly distributed to form a uniform mixture. This is to ensure that the mixture can achieve the best forming efficiency in the subsequent briquetting process. The ash content is crucial for the quality of the final product because it directly affects the strength and stability of the product; S3. Briquetting: The mixed material enters the briquetting machine through the feed inlet with a certain bulk density and is extruded into a preliminary spherical shape by the opposing rolls of the briquetting machine. The fully stirred mixture is then fed into the briquetting machine (also known as the ball press). Here, the mixture is extruded through a die to form a preliminary spherical shape. The die design of the briquetting machine determines the size and shape of the spherical object, and the application of pressure ensures that the materials are tightly combined to form a solid structure; S4. Forced Drying: The formed spherical objects enter the dryer through the conveying system for drying treatment, and then pass through the entire drying area to remove the moisture therein until the moisture inside the spherical objects is completely evaporated. The newly formed spherical objects contain a large amount of moisture and need to be dried to remove this moisture. This step is usually carried out in a drying chamber, where the temperature and humidity are strictly controlled to optimize the drying process, ensuring that the moisture inside the spherical objects is completely evaporated, and at the same time avoiding cracking or deformation caused by rapid drying; S5. Material Conveying: It includes two conveying methods, namely screw conveyors and steep-angle belt conveyors. According to the characteristics of the materials and the conveying purposes in each link, select appropriate conveying equipment to stably connect the main process points of the briquetting system to form a complete process system. During the entire briquetting process, different conveying equipment is needed to transport materials, including screw conveyors, belt conveyors, etc. They are selected according to the characteristics of the materials and the conveying purposes. For example, screw conveyors are suitable for short-distance and horizontal material conveying, while steep-angle belt conveyors are more suitable for long-distance horizontal conveying. These conveying equipment ensure smooth connection between each link, enabling the entire process system to operate efficiently and stably.

[0008] As a further solution of the present invention: It includes a dust collection device. The collected dust directly participates in S1 for re-batching, completing the closed operation of the system and eliminating secondary environmental pollution.

[0009] As a further solution of the present invention: In S2, the environmentally friendly binder is a natural material and does not increase the ash content of the raw coke powder.

[0010] As a further solution of the present invention: In S1, coke fines are used as the main component, the binder helps the material maintain its shape during the forming process, and an appropriate amount of water helps the binder play its role.

[0011] As a further solution of the present invention: In S3, the main body of the briquetting press is driven by the main motor, which drives the hard tooth surface double-output speed reducer through a pin coupling, and drives two roller shafts through a drum-shaped tooth coupling, so that the two roller shafts rotate synchronously relative to each other. One of the roller shaft bearing seats is held by an oil cylinder. When the feeding amount is too large or there are hard objects, the passive roller shaft slips automatically, ensuring the safety of the main body. The motor drives the pump to work. The hydraulic oil is sucked in through the inlet valve and discharged through the outlet valve, and then gathered together and enters the oil cylinder from the oil circuit system to provide a stable total pressure to the pressure roller. When the feeding amount is too large, the center distance between the two pairs of rollers will increase, so the piston of the oil cylinder is reversely compressed, resulting in an increase in the system pressure. The accumulator in the oil pressure system can maintain the pressure stability of the system, and a pressure sensor is provided to enable the oil pump to unload the excess pressure automatically when the working pressure is too large, or to load the pressure to the set value automatically when the pressure is less than the set value.

[0012] As a further solution of the present invention: In S4, the dryer is a mesh belt dryer using steam, hot air, hot flue gas or electricity as the heat source. Its working principle is that first, the material is added to the cloth hopper. The material in the cloth hopper is evenly spread on the conveying mesh belt by the feeder. The conveying mesh belt is made of stainless steel punched mesh and is dragged by the transmission device to move in the dryer. The drying section consists of several units, and the hot air in each unit circulates independently. Part of the tail gas is discharged by a special moisture exhaust fan. The exhaust gas volume of each unit is controlled by a regulating valve. In the upper circulation unit, the air coming out of the circulation fan enters the lower cavity of the unit from the side air duct. After being distributed by the distributor, it blows towards the conveying mesh belt in a jet flow, passes through the material and then enters the upper cavity. The drying process is that the hot air flow passes through the material layer to complete the process of heat and mass transfer. The upper cavity is connected to the fan inlet by an air duct. Most of the gas circulates, and a part of the gas with a lower temperature and a larger moisture content is discharged as waste gas through the moisture exhaust pipe, regulating valve and moisture exhaust fan. In the lower circulation unit, the air coming out of the circulation fan first enters the upper cavity, then passes through the material layer downward and enters the lower cavity. The lower cavity is connected to the fan inlet by the side air duct and the return air duct. The hot air gas circulates, and the moisture is discharged.

[0013] As a further solution of the present invention: In S5, the screw conveyor is used for short-distance and horizontal material transportation, and the large-angle belt conveyor is used for long-distance uphill feeding with a drop.

[0014] As a further solution of the present invention: The drying temperature in S4 is 150 - 250 °C. The steam condensate generated during drying in S4 is used for proportioning in S2 to save resources and realize resource recycling.

[0015] As a further solution of the present invention: In S1 and S2, the weighing and batching system includes a process water metering and distribution tank, a coke powder weighing and discharging tank, and an adhesive weighing and discharging tank. According to the controlled set batching weight, coke powder, adhesive, and process water are quantitatively input into the mixer in sequence.

[0016] As a further solution of the present invention: In S2, the mixing equipment has a standard mixing form and a differential mixing form, and can carry out material mixing in a wider range. The mixing arms are streamlined. To reduce the sticking of the mixing material to the shaft and improve the service life of the mixer, a wear-resistant protective sleeve is designed for the mixing device. According to the statistics of application practice, the service life of this designed mixing arm is doubled. The vertical shaft planetary mixer is designed with a strengthened structure scraper to eliminate the mixing dead angle. The hydraulic or pneumatic method is selected to open and close the discharge door as needed, and the number of discharge doors can be selected from 1 to 3. A special sealing device is set on the discharge door to ensure firm sealing, reliable control, and no possibility of leakage, with strong environmental protection. The large-sized inspection door of the inspection door and safety device is convenient for inspection and cleaning. A safety switch is set on the inspection door with high sensitivity, which is safe and convenient during inspection.

[0017] The present invention has the following beneficial effects compared with the prior art: Solve the disposal of filled coke waste powder: The waste powder generated during the operation of the carbon baking system (the waste powder collected by the traveling crane and after the black method utilization), due to problems such as high ash content, low calorific value, and containing components such as tar, has a low economic value for reuse and is difficult to dispose of.

[0018] Solve the on-site environmental problems: The waste powder generated during the operation of the carbon baking system causes on-site environmental pollution during the charging and discharging and dust transportation processes.

[0019] Reduce production consumption and recycle resources. The consumption of filled coke per ton of carbon block accounts for a certain proportion of the cost consumption. Burn loss and dust generated during the production process are the two main factors for the generation of filled coke waste powder. Among them, the dust generated during the production process can be used for making balls to effectively reduce consumption and achieve resource recycling.

[0020] Conduct a comprehensive and effective analysis on the characteristics of metallurgical coke dust collected from each factory (components and forms containing carbon, ash, oil, etc.), and scientifically formulate adhesives with corresponding formulas to ensure the yield of the made balls, meet the original physical and chemical indexes of metallurgical coke (thermal strength, thermal conductivity), fully restore metallurgical coke, and complete resource reuse.

[0021] Particle size control + screening structure: By defining the three-stage screening parameters and vibration parameters, a precise particle size control system different from conventional screening is formed.

[0022] Surface modification technology: The synergistic effect of the atomization parameters of the silane coupling agent and pneumatic conveying enhances the adsorption activity of coke powder. Description of the Drawings

[0023] Figure 1 is the process flow chart of the present invention; Figure 2 is the structural schematic diagram of the ball making machine of the present invention; Figure 3 is the structural schematic diagram of the dryer of the present invention; Figure 4 is the process flow chart of the ball making system of the present invention.

[0024] In the figure: 1, equipment foundation; 2, integral chassis; 3, main body of briquetting machine; 9, feeding hopper; 10, conveyor mesh belt; 11, moisture exhaust fan; 12, circulation fan; 13, drive reduction gear. Specific embodiments

[0025] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following combines the attached drawings and preferred embodiments to detail the specific embodiments, structures, features and their effects of the present invention as follows.

[0026] Please refer to Figures 1-3 , the present invention provides two technical solutions: Embodiment 1 A process for recycling carbon product roasting filling coke waste powder into balls, comprising the following steps: S1. Weighing and batching: Collect the waste powder generated during the operation of the carbon roasting system, including the dust collected by the traveling crane and the waste powder after the black method utilization. The waste powder is screened by three-stage vibration, and the proportion of particles with a particle size ≤ 0.5 mm is controlled to be ≥ 85%. Quantitative batching is carried out according to the set weight, and batching is stopped respectively according to the set signal to provide basic materials for subsequent mixing. The fine metallurgical coke powder separated from the filling material collected by the dust collecting overhead crane above the roasting furnace in the roasting workshop is used. A silane coupling agent accounting for 0.5 - 1.2% of the weight is sprayed on the surface of the coke powder, and it is transported to the adsorption and purification system for adsorbing asphalt fume by pneumatic conveying. A spiral guide vane is arranged in the pneumatic conveying pipeline to increase the contact area between the coke powder and the asphalt fume by 30 - 40%. The spiral guide vane is welded to the inner wall of the pipeline at a 45° spiral angle, and the distance between the guide vanes is 1.2 - 1.5 times the diameter of the pipeline, forming a swirling flow field with a 20 - 25% increase in turbulent intensity. The waste coke powder is separated by a bag filter; this step is to accurately weigh the waste coke powder, binder and water according to the preset formula ratio and transport them to the mixing and stirring equipment to provide initial materials for subsequent mixing. The coke powder is the main component, the binder helps the material maintain its shape during the forming process, and an appropriate amount of water helps the binder play its role; S2. Mixing and Stirring: The coke powder, binder, and water output according to the set amount of the weighing and batching system enter the stirring system. According to the set sequence and time, through the stirring equipment, ensure that various components are evenly distributed to form a uniform mixture. This is the batching process. In this step, the coke powder, binder, water and other materials are fully mixed. Through the stirring equipment, ensure that various components are evenly distributed to form a uniform mixture. This is to ensure that the mixture can achieve the best forming efficiency in the subsequent briquetting process. The ash content is crucial for the quality of the final product because it directly affects the strength and stability of the product; S3. Briquetting: The mixed material enters the briquetting machine through the feed inlet with a certain bulk density and is extruded into a preliminary spherical shape by the pair of rollers of the briquetting machine. The well-stirred mixture is then fed into the briquetting machine (also known as the ball press). Here, the mixture is extruded through the die to form a preliminary spherical shape. The die design of the briquetting machine determines the size and shape of the spherical object, and the application of pressure ensures that the materials are tightly combined to form a solid structure; S4. Forced Drying: The formed spherical objects enter the dryer through the conveying system for drying treatment, and then pass through the entire drying area to remove the moisture therein until the moisture inside the spherical objects is completely evaporated. The newly formed spherical objects contain a large amount of moisture and need to be dried to remove this moisture. This step is usually carried out in a drying chamber, where the temperature and humidity are strictly controlled to optimize the drying process, ensuring that the moisture inside the spherical objects is completely evaporated, and at the same time avoiding cracking or deformation caused by rapid drying; S5. Material Conveying: It includes two conveying methods, namely screw conveyor and high-inclination belt conveyor. According to the characteristics of the materials and the conveying purpose in each link, select the appropriate conveying equipment to stably connect the main process points of the briquetting system to form a complete process system. During the entire briquetting process, different conveying equipment is needed to transport the materials, including screw conveyors, belt conveyors, etc. They are selected according to the characteristics of the materials and the conveying purpose. For example, screw conveyors are suitable for short-distance and horizontal material conveying, while high-inclination belt conveyors are more suitable for long-distance horizontal conveying. These conveying equipment ensure smooth connection between each link, enabling the entire process system to operate efficiently and stably.

[0027] It includes a dust collection device. The collected dust directly participates in re-batching in S1 to complete the closed operation of the system, eliminating secondary environmental pollution.

[0028] In S1, medium coke powder is used as the main component, the binder helps the material maintain its shape during the forming process, and an appropriate amount of water helps the binder play its role. In S1, the silane coupling agent is sprayed using a two-fluid atomizing nozzle with an atomizing pressure of 0.3 - 0.5 MPa, a droplet size < 50 μm, and surface modification is completed during the pneumatic conveying synchronously with the coke powder. In S1, the three-stage vibrating screening includes stainless steel screens with 10 meshes on the upper layer, 20 meshes on the middle layer, and 40 meshes on the lower layer, a screen surface inclination angle of 25 - 30°, an amplitude of 3 - 5 mm, and a screening efficiency ≥ 92%.

[0029] In S2, the environmentally friendly binder is a natural material without adding raw coke powder.

[0030] In S3, the main body 1 of the briquetting machine is driven by the main motor, drives the hard tooth surface double-output reducer through the pin coupling, and drives two roller shafts through the drum-shaped tooth coupling to keep the two roller shafts rotating relatively synchronously. The bearing seat of one of the shaft rollers is held by the oil cylinder. When the feeding amount is too large or there are hard objects, the passive shaft roller slips automatically, ensuring the safety of the main body. The motor drives the pump to work. The hydraulic oil is sucked in through the inlet valve and discharged through the outlet valve, and then gathered together and enters the oil cylinder from the oil circuit system to provide a stable total pressure to the pressure roller. When the feeding amount is too large, the center distance between the two pairs of rollers will increase, so the piston of the oil cylinder is reversely compressed, resulting in an increase in the system pressure. The accumulator in the oil pressure system can keep the system pressure stable, and a pressure sensor is provided to enable the oil pump to unload the excess pressure automatically when the working pressure is too high, or load the pressure to the set value automatically when the pressure is less than the set value.

[0031] In S4, the dryer is a mesh belt dryer using steam, hot air, hot flue gas or electricity as the heat source. Its working principle is that first, the material is added to the feeding hopper 9, and the material in the feeding hopper 9 is evenly spread on the conveying mesh belt 10 by the feeder. The conveying mesh belt 10 is made of stainless steel punched mesh and is dragged by the transmission device to move in the dryer. The drying section in the mesh belt dryer consists of several upper circulation units and lower circulation units. Each unit has an independent hot air circulation. Part of the tail gas is discharged by a special moisture exhaust fan 11. The exhaust gas volume of each unit is controlled by a regulating valve. In the upper circulation unit, the air coming out of the circulation fan 12 enters the lower cavity of the unit through the side air duct, and after being distributed by the distributor, it blows towards the conveying mesh belt 10 in a jet flow, passes through the material and then enters the upper cavity. The drying process is that the hot air flow passes through the material layer to complete the process of heat and mass transfer. The upper cavity is connected to the fan inlet by an air duct. Most of the gas circulates, and a part of the gas with a lower temperature and a higher moisture content is discharged as waste gas through the moisture exhaust pipe, regulating valve, and moisture exhaust fan 11. In the lower circulation unit, the air coming out of the circulation fan first enters the upper cavity, then passes through the material layer downward and enters the lower cavity. The lower cavity is connected to the fan inlet by the side air duct and the return air duct. The hot air gas circulates, and the moisture is discharged.

[0032] In S5, the screw conveyor is used for short-distance and horizontal material transportation, and the large-angle belt conveyor is used for long-distance feeding with a drop.

[0033] The drying temperature described in S4 is 150 - 250 °C. The steam condensate generated during drying in S4 is used for proportioning in S2, saving resources and realizing resource reuse.

[0034] The weighing and batching system in S1 and S2 includes a process water metering and distribution tank, a coke powder weighing and discharging tank, and an adhesive weighing and discharging tank. According to the controlled and set batching weights, coke powder, adhesive, and process water are quantitatively input into the mixer in sequence.

[0035] In S2, the mixing equipment has standard mixing and differential mixing forms, and can perform material mixing in a wider range. The mixing arms are streamlined. To reduce the sticking of the mixed material to the shaft and improve the service life of the mixer, a wear-resistant protective sleeve is designed for the mixing device. According to statistics from application practices, the service life of this design of mixing arms is doubled. The vertical shaft planetary mixer is designed with strengthened structure scrapers to eliminate mixing dead corners. The discharge door can be switched by hydraulic or pneumatic means as needed, and the number of discharge doors can be selected from 1 - 3. A special sealing device is set on the discharge door to ensure firm sealing, reliable control, and no possibility of leakage, with strong environmental protection. The large-size inspection door of the inspection door and safety device is convenient for inspection and cleaning. A safety switch is set on the inspection door with high sensitivity, which is safe and convenient during inspection.

[0036] Example Two The fine metallurgical coke powder separated from the filling material collected by the dust collection overhead crane above the roasting furnace in the roasting workshop is transported by pneumatic conveying to the adsorption and purification system for adsorbing asphalt fume. After being separated by a bag filter, the waste coke powder is discharged from the adsorption and purification system and then transported to the preliminary powder bin in the regeneration and preparation workshop by a pneumatic conveying system. The coke powder, adhesive, and water are proportioned according to the set weights. Take 200 kg of waste coke powder, add 10 - 15% of the weight of the waste coke powder of the environmental protection adhesive, and mix and stir for about 3 minutes. After being uniform, about 50 L of process water is evenly injected into it, and it is stirred and rolled by a mechanical runner to make the mixture of waste coke powder and environmental protection adhesive evenly mixed with the process water molecules to obtain wet material. The mixed material is extruded and formed through the die of a pelletizing machine (ball press) to form a preliminary spherical shape, and the moisture in it is removed. After being heated to about 150 °C in an oven and kept and left standing until completely dry, the finished regenerated filling material is obtained.

[0037] Through the detection of the thermal conductivity of the filled metallurgical coke material and the regenerated pellets, the thermal conductivity of the metallurgical coke is 0.21 W / (m·k), and that of the regenerated pellets is 0.28 W / (m·k).

[0038] The entire system is standardly equipped with a one-key start function to achieve a fully automated unmanned operation mode, increasing the maintenance space of the equipment and saving the operating personnel costs. There is a professional R & D team for the binder dedicated to calcined filling coke waste powder. A comprehensive and effective analysis is carried out on the characteristics of metallurgical coke dust collected from each manufacturer (components and forms containing carbon, ash, oil, etc.), and the binder with corresponding formula is scientifically formulated to ensure the finished product rate of pelletizing, to meet the original physical and chemical indexes of metallurgical coke (thermal strength, heat conduction performance), fully restore metallurgical coke, and complete resource recycling. During the system operation, a complete dust collection device is equipped to prevent secondary environmental pollution. The collected dust directly participates in re-batching to complete the closed operation of the system. In the drying stage of the system, if the manufacturer is equipped with steam, the steam condensate can participate in the batching to save resources and achieve resource recycling. The pellets produced on the basis of high ash content (38%) can maintain the complete shape strength and good heat conduction performance after experiencing the complete system operation of roasting (starting from the first two furnaces in front of the smoke exhaust rack and being sucked out in the eighth furnace in the cooling area). Corresponding pelletizing production lines with different specifications are equipped according to the production capacity of carbon enterprises to meet the needs of different manufacturers. The entire system is a complete industrial chain, and it is absolutely perfect in technologies such as precise formula, high-pressure pelletizing, efficient drying, and non-destructive conveying.

[0039] Example 3 Please refer to Figure 4 , a system for recycling calcined filling coke waste powder into pellets for carbon products. The system includes a total control system, and the total control system is provided with a one-key start and stop function for controlling the start and stop of equipment in the whole process. There is a water tank and a water storage tank connected to the water tank. Water supply is carried out between the water tank and the water storage tank through at least one water replenishing pump. There is a raw material box and a coke waste powder box connected to the raw material box. The raw material box and the coke waste powder box are provided with bin valves and powder feeding screw conveyors; It also includes an adhesive box for supplying adhesives; The water storage tank, the coke waste powder box and the adhesive box are jointly connected to a mixer. A water distribution solenoid valve and a water distribution pump are arranged between the water storage tank and the mixer. A powder feeding screw conveyor is arranged between the coke waste powder box and the mixer. An adhesive feeding screw conveyor is arranged for the adhesive box. The mixer is also provided with a dust removal fan. A feeding belt is arranged at the discharge port of the mixer for sending the stirred materials to a pellet press. A wet pellet belt is arranged at the discharge position of the pellet press for conveying the pressed wet pellets to a dryer. The dried finished products are stored in a finished product warehouse; The pellet press is at least provided with a one-key start and stop function and a pressure adjustment function. The dryer is at least provided with a preheating one-key start and stop function.

[0040] The above-mentioned conveying mechanisms, belts, etc. for transporting materials are all existing equipment.

[0041] During use, the carbon baking system collects the dust from the traveling crane and the waste powder after the black method utilization during operation, conducts quantitative proportioning according to the set weight, and transports it to the mixing and stirring equipment. The coke powder, binder, and water output according to the set amount of the weighing and batching system enter the stirring system. According to the set sequence and time, a uniform mixture is formed through the stirring equipment. The mixed material enters the pelletizing machine through the feed inlet and is extruded into a preliminary spherical shape with a certain bulk density through the pair of rollers of the pellet press. The formed spherical object enters the dryer through the conveying system for drying treatment, and then passes through the entire drying area to remove the moisture therein until the moisture inside the spherical object is completely evaporated, completing the processing.

[0042] Realize 100% reuse of waste powder (dust from traveling crane + waste powder from black method).

[0043] The dust collection system is in closed-loop linkage with the batching process (dust collection device → S1 re-batching).

[0044] Steam trap and reuse technology (S4 drying steam → S2 water distribution).

[0045] Form a complete industrial chain of "collection - treatment - regeneration - reuse" without secondary pollution emissions.

[0046] Core process innovation Precise proportioning system: Three-level weighing system (coke powder / binder / water) with an accuracy control of ±0.5%.

[0047] Dual-mode stirring technology: Standard / differential stirring is optional, and the streamlined wear-resistant stirring arms extend the service life by 200%.

[0048] Intelligent pressing and forming: The hydraulic servo system dynamically adjusts the roll pressure (pressure fluctuation <5%), and the linkage between the pressure sensor and the accumulator ensures the stability of the forming density.

[0049] Gradient drying process: Zone temperature control (150 - 250°C) combined with mesh through-flow drying, with a moisture removal rate >98% and a cracking rate <0.5%.

[0050] Breakthrough in materials science Research and development of environmentally friendly binder: Natural-based materials enable the ash content to be controlled <5%, breaking through the technical bottleneck of the ash content of traditional binders >15%.

[0051] Thermal performance optimization: The thermal conductivity of the recycled balls reaches 0.28 W / (m·k) (original metallurgical coke 0.21), improving the heat transfer efficiency by 33%.

[0052] High ash content adaptability: It still maintains the complete structural strength under the condition of 38% ash content (the breakage rate of the roasted spheres <3%).

[0053] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content without departing from the technical solution of the present invention. However, as long as it does not depart from the technical solution content of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A process for recycling waste powder of carbon product roasting filling coke into pellets, characterized by: The following steps are involved: S1. Weighing and batching: Collect the waste powder generated by the driving dust collection and black method utilization during the operation of the carbon roasting system. The waste powder is screened by three-stage vibration, and the proportion of particles with a particle size of ≤0.5mm is controlled to be ≥85%. Quantitative proportioning is carried out according to the set weight, and batching is stopped according to the set signal to provide basic materials for subsequent mixing. The fine metallurgical coke powder separated from the filler collected by the dust collecting crane above the roasting furnace in the roasting workshop is sprayed with silane coupling agent accounting for 0.5-1.2% by weight on the surface of the coke powder, and it is transported to the adsorption purification system by pneumatic conveying to adsorb asphalt smoke, and the waste coke powder is separated by a bag dust collector; S2. Mixing and stirring: The coke powder, binder and water output according to the set amount of the weighing batching system enter the stirring system according to the set sequence time. The stirring equipment ensures that the various ingredients are evenly distributed to form a uniform mixture, which is the material preparation process; S3. Compression molding: The mixed materials are extruded through the ball press rollers through the ball press feed port at a certain bulk density to form the initial shape of the ball; S4, forced drying: The formed spheres are conveyed into the dryer through the conveying system for drying, and then pass through the entire drying area to remove the moisture in them until the moisture inside the spheres is completely evaporated; S5. Material transportation: There are two transportation methods: screw conveyor and high-angle belt conveyor.

2. The process for pelletizing and recycling waste powder of carbon product roasting filling coke according to claim 1, characterized in that: Including dust collection device, the collected dust is directly used in S1 re-batch to complete the closed operation of the system.

3. The process for recycling waste powder of carbon product roasting filling coke according to claim 1 is characterized in that: The environmentally friendly binder in S2 is a natural material without adding raw coke powder.

4. The process for recycling waste powder of carbon product roasting filling coke into pellets according to claim 1, characterized in that: The adhesive in S1 is used to shape the coke powder. The silane coupling agent in S1 is sprayed with a dual-fluid atomizing nozzle with an atomizing pressure of 0.3-0.5MPa and a droplet size of <50μm. The surface modification is completed during the synchronous pneumatic conveying of the coke powder. The three-stage vibration screening in S1 includes 10-mesh upper layer, 20-mesh middle layer, and 40-mesh lower layer stainless steel screens. The screen surface inclination angle is 25-30°, the amplitude is 3-5mm, and the screening efficiency is ≥92%.

5. The process for recycling waste powder of carbon product roasting filling coke into pellets according to claim 1, characterized in that: The main machine (1) of the S3 medium-pressure ball machine is driven by the main motor, which drives the hard-toothed double-output reducer through a pin coupling, and drives the two rollers through a drum gear coupling, so that the two rollers keep rotating synchronously with each other. The bearing seat of one of the rollers is supported by an oil cylinder.

6. The process for recycling waste powder of carbon product roasting filling coke into pellets according to claim 1, characterized in that: The drying machine in S4 is a mesh belt dryer using steam, hot air, hot flue gas or electricity as a heating source. When in use, materials are added to the distribution hopper (9), and the materials in the distribution hopper (9) are spread on the conveying mesh belt (10) by the feeder. The circulating air from the circulating fan (12) in the upper circulation unit enters the lower chamber of the unit through the side air duct, and after being distributed by the distributor, it is blown toward the conveying mesh belt (10) in the form of a jet flow, passes through the materials and enters the upper chamber. The air from the circulating fan in the lower circulation unit first enters the upper chamber, and then passes through the material layer and enters the lower chamber. The lower chamber is connected to the fan inlet through the side air duct and the return air duct, and the hot air gas circulates and the moisture is discharged.

7. The process for recycling waste powder of carbon product roasting filling coke according to claim 1 is characterized by: The screw conveyor in S5 is used for short-distance and horizontal material transportation, and the high-angle belt conveyor is used for long-distance and drop-type material feeding.

8. The process for recycling waste powder of carbon product roasting filling coke according to claim 1 is characterized by: The drying temperature in S4 is 150-250° C., and the steam generated by the drying in S4 is used for proportioning in S2.

9. The process for recycling waste powder of carbon product roasting filling coke according to claim 1 is characterized in that: The weighing batching system in S1 and S2 includes a process water metering and dispensing tank, a coke powder weighing and discharging tank, and an adhesive weighing and discharging tank. According to the batching weight set by the control, the corresponding coke powder, adhesive and process water are input into the mixer in sequence and quantity. The mixing equipment in S2 has standard mixing form and differential mixing form.

10. A carbon product roasting filling waste coke powder pelletizing and recycling system, used for pelletizing waste coke powder in conjunction with the process described in claims 1-9, characterized in that: The system comprises a general control system, and the general control system is provided with a one-button start-stop function, a water tank and a water storage tank connected to the water tank, and water is supplied between the water tank and the water storage tank through at least one water replenishment pump, a raw material box and a coke waste powder box connected to the raw material box, and the raw material box and the coke waste powder box are provided with a silo valve and a powder adding spiral feeding mechanism; Also included is an adhesive box for supplying adhesive; The water storage tank, the waste coke powder box and the adhesive box are connected to the mixer together, a water distribution solenoid valve and a water distribution pump are arranged between the water storage tank and the mixer, a powder distribution spiral feeding mechanism is arranged between the waste coke powder box and the mixer, the adhesive box is provided with an adhesive spiral feeding mechanism, the mixer is also provided with a dust removal fan, a feeding belt is arranged at the discharge port of the mixer, which is used to send the stirred material to the ball press, and a wet ball belt is arranged at the discharge position of the ball press, which is used to send the pressed wet balls to the dryer, and the finished products after drying are stored in the finished product warehouse; The ball press is provided with at least a one-button start-stop function and a pressure adjustment function, and the dryer is provided with at least a preheating start-stop function.

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