57 results about "Petroleum coke" patented technology

The application belongs to the technical field of petroleum coke proportioning, and in particular discloses a petroleum coke proportioning and adding control system, which comprises: a raw material storage unit for storing different kinds of petroleum coke raw materials; a proportioning calculation unit for calculating the adding amount of various petroleum coke raw materials according to a preset proportioning scheme and production requirements; a conveying control unit for controlling the flow of petroleum coke raw materials conveyed from each raw material storage unit to a mixing device according to the calculation result of the proportioning calculation unit; and a mixing device for uniformly mixing various petroleum coke raw materials conveyed. Through accurate proportioning calculation and flow control, the application ensures accurate proportioning and uniform mixing of petroleum coke raw materials, thereby improving the uniformity and stability of the final product. Meanwhile, the automatic control system reduces the time and error of manual operation, significantly improves the production efficiency, enables enterprises to respond to market demand more quickly, and enhances the competitiveness.

This invention provides a method for producing reduced ilmenite, belonging to the field of solid-state reduced ilmenite technology. This invention uses a petroleum coke pot furnace to produce reduced ilmenite, utilizing the heat of the pot furnace to reduce carbon-containing titanium ore pellets. Simultaneously, the combustible gases generated by the titanium ore pellets continue to heat the flue, allowing the reduction process to continue without external heat. This method utilizes the low-cost, self-heating mechanism of a pot furnace for producing calcined coke to produce reduced ilmenite, reduced iron, or other carbothermally reducible metal oxides. The pelletizing formula and method used are significantly different from the traditional rotary kiln used for producing reduced ilmenite, facilitating operation within the pot furnace, increasing permeability, and enhancing the reduction effect. This invention not only reduces production costs but also improves the production method of reduced ilmenite.

The present application relates to the field of energy-saving and environment-friendly production technology, in particular to a calcination method and system for flow-suspension roasting of petroleum coke. The method comprises: feeding petroleum coke raw materials into a multi-stage preheating system for countercurrent preheating; after preheating, the materials enter a flow-suspension roasting furnace to form a suspension state in a high-temperature airflow for rapid roasting; after roasting, the materials are separated from the flue gas, the separated flue gas containing volatile components is combusted in a combustion furnace and then subjected to purification treatment, and the heat is partially recycled; the separated high-temperature calcined coke is cooled through an air cooling and water cooling system and the heat is recovered, and the hot air generated by air cooling is recycled to the roasting furnace. The present application uses fluidization technology to shorten the roasting time to seconds, significantly improving the production efficiency; through multi-stage countercurrent heat exchange, flue gas combustion and heat recycling, the present application realizes heat cascade utilization and precise atmosphere control, greatly reduces energy consumption and oxidation loss, and stably controls the volatile component of the product below 1%, with high yield and uniform quality.

This invention discloses a method for modifying high-sulfur petroleum coke. The method includes the following steps: mixing high-sulfur petroleum coke raw material with a treatment agent; performing solid-liquid separation after treatment; and washing and drying the separated solid material to obtain the product. The high-sulfur petroleum coke raw material can be further pretreated. This method can reduce the sulfur content of high-sulfur petroleum coke to below 3%, obtaining a qualified low-sulfur petroleum coke product, while simultaneously improving the performance of the petroleum coke product by more than one grade.

The present application relates to the technical field of petroleum coke calcination, and particularly discloses an energy-saving and environment-friendly petroleum coke calcination system. The system comprises a rotary kiln calcination unit, a flue gas waste heat deep recovery unit, a kiln body radiation heat recovery and heat preservation strengthening unit, and an intelligent thermal regulation and control unit. The flue gas waste heat unit recovers flue gas in multiple stages through high-temperature radiation, medium-temperature convection, and low-temperature heat pipe heat exchangers. The kiln body unit recovers kiln body heat dissipation through heat-conducting pads, heat pipe arrays, and cooling jackets, and uses an outer heat preservation layer to inhibit heat loss. The intelligent regulation and control unit dynamically optimizes system operation based on real-time data. The scheme realizes efficient use of the full spectrum of heat energy, improves system thermal efficiency, and reduces energy consumption.

This invention belongs to the field of waste gas treatment technology, and in particular to a desulfurization tower for petroleum coke calcination flue gas. It includes a tower body with several circumferentially arrayed and equidistantly distributed stirring blades. A dual-spray system is installed on each stirring blade. The tower body also includes a switching mechanism for driving the stirring blades to rotate and activating a dry powder mode during rotation. The dual-spray system allows external aqueous agents to sequentially pass through a water pipe, an aqueous agent channel within an annular shaft, a first semi-circular channel, and a bend pipe, ultimately being sprayed out through a nozzle. External dry powder sequentially passes through a powder pipe, a dry powder channel within the annular shaft, and a second semi-circular channel, ultimately being thrown out through a transverse support rod, thus solving the problem of the relatively limited usage of traditional desulfurization towers.

A novel circulating fluidized bed chlorination furnace system is disclosed. The outlet of the petroleum coke feed tank is connected in parallel to the lower inlet of the chlorination furnace via a discharge pipe. The bottom of the chlorination furnace also has multiple chlorine inlets and slag discharge ports. The chlorine inlets are connected to chlorine pipes, and the slag discharge ports are connected to slag discharge pipes. The top of the chlorination furnace has an outlet, which is connected to the side inlet of a high-temperature cyclone separator via a feed pipe. The top of the high-temperature cyclone separator also has a liquid discharge port, which is connected to the top of a low-temperature cyclone separator via a liquid discharge pipe. The top of the low-temperature cyclone separator also has a liquid outlet. This invention features a compact structure, convenient installation, stable operation, and is safe and environmentally friendly. The entire reaction system is fluidized, preventing slag discharge pipe blockage. The combined use of the high-temperature and low-temperature cyclone separators ensures multiple cycles, repeated combustion, and reaction of the titanium tetrachloride mixture.

FIELD: coke production.SUBSTANCE: closed, gas-tight system is proposed for producing commercial pieces of petroleum coke from hardened petroleum coke in a coke drum unit, adapted for connection to a coke drum unit (X) containing hardened petroleum coke. The system comprises a coke crusher (C), a pipeline through which oil coke sludge is directed to a closed sludge pond, a closed sludge pond (E) and a dewatering hopper unit (G). In addition, the system comprises a closed tank (I) for drainage water, adapted to receive filtered water and petroleum coke fines from the installation (G), a single water reservoir (L), adapted to receive filtered water discharged from the tank (I), a discharge pipeline (2) for heated quenching water, intended for directing heated quenching water coming from the coke drum installation (X) into a slurry pool (E), and a pipeline (3) for cooling water, passing from the water tank (L) to the discharge pipeline (2) and connecting to the discharge pipeline (2) for supplying cooling water from the tank (L) to the discharge pipeline (2).EFFECT: development of a system that virtually eliminates emissions of steam and coke breeze into the environment.11 cl, 1 dwg

This invention belongs to the field of all-scrap steel smelting technology, specifically disclosing a smelting method for producing green, low-carbon emission automotive steel from all-scrap steel with increased carbon and controlled nitrogen content. The method includes the following steps: Electric furnace smelting: using 100% scrap steel, adding a low-nitrogen slagging agent to the electric furnace, performing bottom blowing argon before tapping, and shutting off the argon gas just before ladle hoisting; LF refining: after the ladle is in place, the argon gas is turned on; the ladle is moved to the smelting station, lime is added, electricity is turned on, and after a thin slag layer forms, the electric arc is completely covered by high-alkalinity foam slag. The voltage is then increased, the temperature is raised, the argon gas flow rate is adjusted, and aluminum segments are added for diffusion deoxidation; low-nitrogen, low-titanium petroleum coke carbonizer is added in batches until the carbon content is in the range of 2.5-2.7%, the temperature is raised again, and the argon gas flow rate is adjusted; static blowing is performed, and the molten steel temperature at the outlet is 1605-1615℃. This technical solution can effectively control the carbon and nitrogen content at the LF furnace outlet after the electric furnace tapping.

This invention belongs to the field of lithium-ion production technology, and specifically relates to a high-efficiency and energy-saving mixing system for petroleum coke and pitch used in the production of aluminum electrolytic anode carbon blocks. The system includes a working plate with a material discharge hole at its top, and two rotating support seats symmetrically fixed to the top of the working plate. A large mixing cylinder is rotatably mounted on each of the two rotating support seats, with a discharge pipe connected to its outer side. The large mixing cylinder has an elliptical hollow structure, wider in the middle and narrower at both ends, used to accommodate and mix petroleum coke and pitch raw materials. Two annular support members are fixedly installed on the outer sides of both ends of the large mixing cylinder, and these two annular support members rotatably engage with the two rotating support seats. This invention achieves bidirectional reverse mixing, dual-mode heating for energy saving, precise temperature control and insulation, leak-proof sealing, and high-efficiency production, improving the quality and efficiency of anode carbon block production while reducing energy consumption.

The utility model discloses a kind of petroleum coke granule screening cooling devices. Including screening machine and conveyer, the screening machine is located above the one end of conveyer, the screening machine has for receiving petroleum coke granule small granule hopper and large granule hopper, the top of small granule hopper and large granule hopper is connected with small granule nozzle and large granule nozzle respectively, the liquid collecting tank is installed in the conveyer, the liquid collecting tank is communicated with small granule nozzle and large granule nozzle by pipeline unit. A kind of petroleum coke granule screening cooling device of the utility model solves the problem that traditional petroleum coke cooling equipment generally cannot accurately screen and cool different size particles.

This utility model provides a petroleum coke treatment device for prebaked anodes, including a tank-type calcining furnace body with a feeding port at the top and a discharge port at the bottom. A discharge chamber is connected to the bottom of the discharge port. The treatment device also includes a clearing mechanism, comprising a sleeve coaxially disposed within the discharge chamber, a rotating rod coaxially disposed within the discharge chamber, a first stirring element disposed on the rotating rod and above the sleeve, a second stirring element disposed on the rotating rod and below the sleeve, and a vertically extending telescopic mechanism connected to the bottom of the rotating rod. This utility model solves the problems of easy clogging of the discharge port and discharge chamber of existing tank-type calcining furnaces, poor stirring effect, and lack of effective cooling and auxiliary discharge measures.

The application discloses a petroleum coke raw material batching system and a batching method. The system comprises a premixing unit, a first mixing unit, a second mixing unit, a mixing and kneading unit, a compression molding unit and corresponding feeding equipment. Petroleum coke fine material feeding equipment is connected to the first mixing unit and the second mixing unit in two ways. A production control system receives production scheduling requirements, calculates the addition ratio alpha of the composite reinforced carbon-based material according to target performance, and automatically allocates the ratio of two-way petroleum coke fine material (the ratio of premixing material and remaining material) based on the addition ratio alpha of the composite reinforced carbon-based material, while regulating the operating parameters of the entire line. The scheme of the application not only ensures the sufficient dispersion of the reinforcing material, but also avoids excessive shearing and balances the processing capacity and production rhythm of each equipment on the production line, realizes flexible and intelligent production, can quickly switch different specifications of products, improves production efficiency, reduces energy consumption, and is particularly suitable for the large-scale production of conductive functional components such as aluminum electrolysis anodes and electric carbon electrodes.

This invention discloses a high-porosity alumina material and its preparation method, comprising the following steps: Step 1: Mixing a certain amount of gibbsite, aluminum nitrate, and NH4F uniformly; Step 2: Adding carbon fiber, petroleum coke, and paraffin wax to the mixture in Step 1, followed by pressing into tablets and high-temperature calcination to obtain the alumina material. This invention proposes a method for preparing ultra-high-porosity alumina materials based on carbon fiber, petroleum coke, and pseudoboehmite through a tablet pressing and high-temperature calcination process. This method fully utilizes the decomposition characteristics of pore-forming agents during calcination and the regulatory effect of chemical modifiers on pore structure, significantly improving the porosity and pore size distribution of the support, while optimizing mechanical strength and chemical stability. This invention features a simple process, controllable cost, and ease of industrialization, providing a high-performance alumina support for efficient catalytic reactions, macromolecular adsorption and separation, and energy conversion, exhibiting significant technical advantages and application value.

This invention provides a method for preparing carbon quantum dots from petroleum coke, relating to the field of carbon nanomaterials technology. The method includes calcining petroleum coke and then subjecting it to adaptive oxidative pyrolysis with an additive containing phosphotungstic acid, an ionic liquid, and hydrogen peroxide; nitrogen doping; and surface stabilization treatment with a stabilizer composed of sodium hyaluronate, poloxamer 188, and sodium citrate; finally, carbon quantum dots are obtained by pH adjustment flocculation, centrifugation, dialysis, and drying. This method achieves efficient and green conversion of petroleum coke under mild conditions through the synergistic effect of specialized additives and stabilizers. The prepared carbon quantum dots have the advantages of high fluorescence quantum yield, good dispersion stability, and high yield, providing a new approach for the high-value utilization of petroleum coke.

The application discloses a method for preparing carbon anodes by using inferior petroleum coke. According to the differences in the contents of sulfur and vanadium in the petroleum coke, the raw materials are divided into high-sulfur high-vanadium petroleum coke, high-sulfur low-vanadium petroleum coke and low-sulfur low-vanadium petroleum coke, and are respectively subjected to differential calcination at different temperatures. After the calcination, the petroleum coke is crushed and sieved, and is functionally formulated according to the particle size, wherein the high-sulfur low-vanadium petroleum coke is used for constructing an anode skeleton, the high-sulfur high-vanadium petroleum coke is used in the form of fine powder to participate in the baking stage and the synergistic shrinkage of coal pitch, and the remaining particle size adopts the low-sulfur low-vanadium petroleum coke. After the formulation, the coal pitch is mixed and kneaded to be formed and baked, so that the carbon anode is prepared. Under the condition of blending and using the high-sulfur high-vanadium petroleum coke, the method can make the contents of sulfur and vanadium in the finished carbon anode meet the industrial use requirements, and can ensure that the physical and chemical properties of the finished carbon anode, such as air reactivity and resistivity, reach the level of traditional high-quality carbon anodes.

This invention belongs to the field of material performance testing technology, specifically relating to a method for determining the particle density of carbon anode raw materials. The method includes: injecting water into a first container until the liquid levels in the first and second containers are equal, and reading the scale of the first and second containers as V1; adding carbon anode raw material particles with a mass of m, including petroleum coke or calcined coke, into the first container; injecting a mixed solution into the first container until the carbon anode raw material particles are completely submerged, the mixed solution including pure water and a low-foaming nonionic surfactant; pre-treating the first and second containers in an ultrasonic instrument; and placing the pre-treated first and second containers into a vacuum chamber, evacuating the chamber until it reaches negative pressure, and maintaining the pressure in the vacuum chamber. This method for determining the particle density of carbon anode raw materials can accurately measure the particle density of carbon anode raw materials.

The application discloses a kind of porous graphite, preparation method and application of silicon-carbon composite material, belong to battery material technical field.The preparation method is: metal, petroleum coke and its dopant are mixed uniformly, pre-carbonization, graphitization, obtain graphite material, then it is etched to pore by plasma technology, then activation, obtain porous graphite;Finally by silane cleavage method, pass in silane mixed gas and carry out nanometer silicon deposition, passivation, then the obtained material is added to the solution of lithium molybdate and lithium sulfonate and coated, spray drying, obtain double lithium compound coated silicon-carbon composite material.The obtained material utilizes the characteristics that porous graphite itself electronic conductivity is high, and the outer layer coated double lithium salt structure improves ionic conductivity and its first efficiency, and plays the synergistic effect between the two, reduces expansion, improves cycle performance.

The utility model relates to a mixing device technical field especially disclose a kind of calcined petroleum coke mixing device, baffle is fixedly connected in mixed bucket interior, baffle interior is rotatably connected with connecting rod, two sliding blocks are sleeved in connecting rod interior, two sliding blocks are respectively fixedly connected with a group of quadrilateral stopper in inside, two groups of quadrilateral stopper are all provided with feeding hole in inside, eccentric rod is rotatably connected in baffle interior, twist eccentric rod, connecting rod is rotated by eccentric rod, two sliding blocks are slid in opposite direction by connecting rod in the process of rotation, two quadrilaterals in two groups of quadrilateral stopper are slid by two sliding blocks respectively, when two quadrilaterals slide in opposite direction, other four quadrilaterals are extruded along the inner wall of baffle and slide to change the size of feeding hole opening, can accurately adjust the feed quantity of petroleum coke according to production demand and process requirement, increase the application range and versatility of equipment.

The utility model provides a kind of calcined petroleum coke mixing and batching device, comprising: bottom plate, horizontal mixing tank and composite stirring assembly, wherein, two support frames are respectively installed in the two ends of horizontal mixing tank, and its bottom end is respectively installed with multiple support legs, horizontal mixing tank is set in the top end of bottom plate by two support frames and multiple support legs, composite stirring assembly includes two rotating discs, first stirring shaft and second stirring shaft, wherein, two rotating discs are respectively rotatably connected in the two ends of horizontal mixing tank, first stirring shaft and second stirring shaft are set between two rotating discs, driving assembly is arranged between composite stirring assembly and bottom plate, and the driving part of driving assembly is connected with the two rotating discs of composite stirring assembly. The calcined petroleum coke mixing and batching device of the utility model embodiment can eliminate mixing dead angle, and strengthen the macroscopic convection and microscopic shear efficiency of petroleum coke, efficiently realize the high-quality mixing of petroleum coke and asphalt.

The application provides a device for mixing petroleum coke for anodes, and relates to the technical field of prebaked anode production. The device comprises a raw material bin, a conveying mixer, a buffer bin, a conveyor, a first elevator and a second elevator. The number of the raw material bins is at least two, and the discharge openings of the raw material bins are respectively connected with the feeding openings of the conveying mixers. The feeding openings of the conveying mixers are provided with first control valves. The discharge openings of the conveying mixers are connected with the buffer bin through the first elevator. The buffer bin is provided with the conveyor below the discharge opening, and the discharge opening of the buffer bin is provided with a second control valve. One end of the conveyor is connected with one raw material bin through the second elevator. The device for mixing petroleum coke for anodes can improve the mixing efficiency and ensure the uniformity of the petroleum coke mixture, thereby providing a stable and reliable raw material basis for the high-quality production of prebaked anodes.

The present application belongs to the technical field of desulfurization, and relates to a petroleum coke electrochemical desulfurization method, comprising the following steps: S1, mixing petroleum coke and an electrolytic solution according to a solid-liquid ratio of 1g:1-9.5mL to obtain a slurry; S2, taking graphite as a cathode and anode, electrolyzing the slurry at 5-80 DEG C for 4-20h to obtain desulfurized petroleum coke; the electrolytic solution comprises a bromide salt and an acetate salt. The present application uniformly mixes a bromide salt, an acetate salt and an aqueous solution to prepare a specific electrolytic solution, electrolyzes a slurry obtained by mixing high-sulfur petroleum coke and the electrolytic solution to desulfurize, and finally obtains a low-sulfur petroleum coke product. The present application provides a high-sulfur petroleum coke electrochemical efficient deep desulfurization method. The present application not only has high desulfurization efficiency, but also has a green and clean process, can greatly reduce production cost, and increases the application value of high-sulfur petroleum coke.

This invention belongs to the field of electrode material technology, specifically relating to a method for preparing and applying a petroleum coke-based hard carbon anode material. The preparation method includes the following steps: mixing petroleum coke powder with an oxidant at 0-5°C and oxidizing for 12-48 hours to obtain an oxidation precursor; carbonizing the oxidation precursor under a protective atmosphere to obtain the final product. The preparation method of this invention effectively avoids the formation of a dense oxide layer on the surface by strictly suppressing the intense exothermic reaction in the initial stage, ensuring that the oxidant can slowly and fully penetrate and react from the surface inwards. The resulting petroleum coke-based hard carbon anode material exhibits excellent electrochemical performance.

This utility model relates to the technical field of vibratory conveying equipment for calcined petroleum coke, and specifically discloses a conveying trough for a vibratory conveyor of calcined petroleum coke. The vibration-enhancing mechanism includes a triangular block, a silicon nitride coating, a first spring, a second spring, a connecting column, and an outer groove of the conveying trough. The triangular block is fixedly installed inside the U-shaped groove, the silicon nitride coating is disposed inside the U-shaped groove, the first spring is fixedly installed on the side wall of the U-shaped groove, the second spring is fixedly installed on the side wall of the U-shaped groove, the connecting column is rotatably installed at the bottom of the U-shaped groove, and the outer groove of the conveying trough is rotatably installed at the bottom of the connecting column. The U-shaped groove vibrates with the vibratory conveyor. When petroleum coke falls into the U-shaped groove, it is conveyed inside the U-shaped groove. When the petroleum coke comes into contact with the triangular block, it will be separated to the left and right sides. Due to the triangular block, the petroleum coke is difficult to adhere to the inner wall of the U-shaped groove. The asymmetrical installation of the second spring and the first spring increases the vibration amplitude of the device during conveying, thus making it difficult for the petroleum coke to adhere to the inside of the U-shaped groove.

The application provides a copper-based catalytic electrode and a preparation method and application thereof. The copper-based electrode comprises a porous carbon base and copper species dispersed on the porous carbon base. The content of the porous carbon base is 60-90 wt% based on the weight of the copper-based catalytic electrode, and the content of the copper species is 5-20 wt%. The preparation method of the copper-based catalytic electrode comprises the following steps: (1) obtaining carbon material by activating petroleum coke; (2) preparing a carbon electrode by taking the carbon material obtained in step (1) as a base material; and (3) introducing copper on the carbon electrode obtained in step (2) to obtain the copper-based catalytic electrode. The prepared copper-based catalytic electrode shows high ethylene selectivity and good stability when used in the electro-reduction of carbon dioxide to ethylene.

This application provides a method and application for improving the slagging performance of petroleum coke gasification ash during combustion, belonging to the technical field of petroleum coke gasification ash treatment. The method includes: wet ball milling of petroleum coke gasification ash; adding a betaine-type surfactant solution to increase the hydrophilicity and dispersibility of the ash slurry; ultrasonic activation with an activator; drying the activated gasification ash; and then feeding it into a combustion device for combustion reaction, collecting the ash after combustion for heavy metal recovery.

The application provides a power type porous carbon composite material and a preparation method thereof, a silicon-carbon negative electrode material and a lithium ion battery, and belongs to the technical field of battery materials. The preparation method comprises the following steps: mixing a resin and a pore-forming agent, performing carbonization treatment, and obtaining a resin-based porous carbon; mixing the resin-based porous carbon, petroleum coke-based porous carbon and an organic catalyst to obtain a mixed precursor, then depositing carbon nanotubes in the pores of the mixed precursor, and performing activation treatment to obtain the power type porous carbon composite material. The application adopts the composite design of the resin-based porous carbon and the petroleum coke-based porous carbon, improves the power performance of the material, reduces the volume expansion, and improves the compaction density; the doping of the organic catalyst and the deposition of the carbon nanotubes are beneficial to reducing the material impedance, improving the electronic conductivity, and the carbon nanotubes can bridge the resin-based porous carbon and the petroleum coke-based porous carbon, can reduce the interface contact resistance, shorten the ion diffusion path, and improve the specific capacity and the cycle life of the material.

The utility model belongs to transmission equipment technical field especially for a kind of transmission equipment for petroleum coke, including mounting bracket, the transmission assembly is installed at the mounting bracket, the transmission assembly is used to the transmission of petroleum coke, the side of the mounting bracket is located at transmission assembly and is provided with blanking plate, the blanking plate and transmission assembly place belt contact, the bottom of the blanking plate is equipped with moving plate;The utility model is pulled to moving plate by reset part, so that blanking plate better and transmission assembly place belt contact, this design has remarkable advantage.In actual operation process, when petroleum coke is transitioned from blanking plate to the belt of transmission assembly, due to the close contact between blanking plate and belt, it can effectively avoid the spilling phenomenon of material during transition, reduce the loss of material.At the same time, the close contact ensures the continuity and stability of the transmission process, reduces the equipment failure rate caused by material spilling or poor transmission.

This application belongs to the field of carbon production technology for aluminum, specifically proposing a waste heat recovery device and method for a tank-type calcining furnace. The method includes: conveying the calcined coke discharged from the tank-type calcining furnace to a calcined coke heat exchange unit, using the waste heat of the calcined coke to heat transfer oil to obtain a first heat transfer oil flow; conveying the waste heat flue gas discharged from the tank-type calcining furnace to a flue gas heat exchange unit, using the waste heat flue gas to heat transfer oil to obtain a second heat transfer oil flow; mixing the first and second heat transfer oil flows in a preset ratio through a control unit to obtain a third heat transfer oil flow; conveying the third heat transfer oil flow to a heat-using unit, using the heat in the third heat transfer oil flow to dry the petroleum coke raw material in the heat-using unit to obtain recovered heat transfer oil; and conveying the recovered heat transfer oil through a circulation pipeline to the calcined coke heat exchange unit and the flue gas heat exchange unit for reheating. The technical solution provided by this application can improve the waste heat recovery rate of the tank-type calcining furnace.

The application provides a doped copper-based catalytic electrode and a preparation method and application thereof, the doped copper-based catalytic electrode comprises a porous carbon base, nitrogen species and copper species, the content of the porous carbon base in terms of carbon element is 60wt%-90wt% based on the weight of the doped copper-based catalytic electrode, the content of the copper species in terms of copper element is 5wt%-25wt%, and the content of the nitrogen species in terms of nitrogen element is 5wt%-15wt%. The preparation method of the doped copper-based catalytic electrode comprises the following steps: (1) pretreating petroleum coke; (2) activating the pretreated petroleum coke; (3) preparing a nitrogen-doped carbon electrode by taking the activated petroleum coke as a base material; and (4) introducing copper to the nitrogen-doped carbon electrode by an electrochemical deposition method to obtain the doped copper-based catalytic electrode. The problems of low catalytic activity, poor stability and difficulty in large-scale use of existing electrochemical catalytic materials are solved.