467results about "Electric discharge heating" patented technology

The invention discloses a yellow phosphorus furnace electrode paste and a preparation method thereof, and belongs to the technical field of yellow phosphorus furnace production, the yellow phosphorus furnace electrode paste comprises the following raw materials by mass: 55-65% of anthracite particles, 20-25% of petroleum coke, 5-10% of graphite chips, 18-25% of a composite binder, 0.3-1.5% of a composite antioxidant and 1.5-4.5% of an additive; the yellow phosphorus furnace electrode paste provided by the invention is produced according to the preparation method provided by the invention, and the resistivity, compressive strength and oxidation resistance can be synchronously improved through the design of carbon material multistage particle size distribution, a nano-reinforced composite binder and a synergistic anti-oxidation system in combination with an efficient drying and densification process; the problem that an existing electrode paste is poor in density and performance is effectively solved.

A furnace vessel of an arc furnace is loaded with solid metal. Afterward, an energy supply device of the arc furnace feeds electrical energy to electrodes of the arc furnace via a furnace transformer to form arcs between the electrodes and the metal, the arcs melting the metal. Finally, the molten metal is removed from the furnace vessel. The number of electrodes is at least three. For at least two of the electrodes, the energy supply device individually sets the operating frequency (fa, fb) of the relevant electrode. The current (Ic) through the third electrode is defined by the current (Ia, Ib) through the first and the second electrodes. Which of the electrode is the first electrode, which is the second electrode, and which is the third electrode is assigned dynamically.

The invention discloses an iron alloy electrode paste and a preparation process, and belongs to the technical field of electrode paste preparation, the iron alloy electrode paste comprises a composite aggregate system and a composite binder system, the composite aggregate system comprises the following components by mass: 40-60% of anthracite aggregate, 15-25% of artificial graphite flake, and 3-8% of silicon carbide whisker; the composite binder system comprises the following components in percentage by mass: 70-80% of medium-temperature modified coal pitch, 10-15% of furan resin and 5-10% of dispersion liquid containing nano boron carbide, and the composite binder system is combined with the composite aggregate system through a gradient permeation process to form a three-dimensional conductive network and an enhanced interface; the composite aggregate system and the composite binder system are optimally proportioned, and gradient permeation and gradient kneading processes are combined, so that the comprehensive performance of the electrode paste is remarkably improved, the thermal shock resistance is greatly improved and the linear shrinkage rate is reduced while low resistivity is maintained, the electrode paste is suitable for smelting ferroalloys such as silicomanganese and ferrochromium, and the service life is remarkably prolonged.

The invention discloses a furnace end uniform in heating. The furnace end comprises a top plate, a bottom plate and a plurality of plasma combustors. A furnace chamber is defined by the top plate and the bottom plate. Due to the fact that the air inlet holes are formed in the radial direction, the position and size precision of the air inlet holes can be guaranteed by adopting a machine to pre-embed the needles and pull the needles, manual intervention is not needed, the labor cost is reduced, gas can directly impact the anode needles and take away part of heat generated by the anode needles, and a certain cooling effect on the anode needles is achieved; the electric arc generated between the anode needle and the cathode pintle is maintained in the axis space, so that direct interference or influence of airflow on the electric arc in the area is avoided; by arranging the cathode pintle, the plasma jet impacts the head of the cathode pintle and then is sprayed out in the radial direction, the energy of the plasma jet is dispersed in a larger range, the concentration ratio and the energy density of the jet are reduced, the phenomenon of local overheating is avoided, and uniform heating of cookware is achieved.

The invention discloses a graphite electrode cooling device of a graphitization furnace, the graphitization furnace and a cooling method, and relates to the technical field of graphite electrode cooling, the graphite electrode cooling device of the graphitization furnace comprises a cooling mechanism, the cooling mechanism comprises an adhesion layer and a plate type heat pipe, an adhesion layer is arranged on the surface of the graphite electrode exposed outside the graphitization furnace, the plate type heat pipe is arranged on one side, far away from the surface of the graphite electrode, of the adhesion layer, the plate type heat pipe comprises a sealing shell, a medium cavity is formed in the sealing shell, a capillary core layer is arranged on the inner wall of the medium cavity, and a cooling medium is stored in the medium cavity; according to the graphite electrode cooling device of the graphitization furnace, the plate type heat pipe is attached to the surface of the exposed graphite electrode, circulating water cooling is not needed, phase change heat transfer of a cooling medium is utilized, the heat dissipation efficiency is improved, phase change heat transfer is not conducted under the low-temperature condition, and invalid heat exchange is avoided.

Electrodes (1) of a three-phase arc furnace (2) are supplied with electrical energy by a multilevel converter (4) via a furnace transformer (3) from a supply network (5) with multiple input phases (6). An associated control device (15) receives measured values ​​for output phase currents (I1, I2, I3) flowing on the output side of the multilevel converter (4). Furthermore, the control device (15) is provided with information about a current output target power (P*) for a given time.The control device (15) determines output-side target phase voltages (U1*, U2*, U3*) for the respective current point in time on the basis of the output-side phase currents (I1, I2, I3) and the output-side target power (P*), so that the sum of the products of the output-side target phase voltages (U1*, U2*, U3*) and the target values ​​(I1*, I2*, I3*) for the output-side phase currents (I1, I2, I3) determined on the basis of the output-side phase currents (I1, I2, I3) is equal to the current output-side target power (P*). The control device (15) controls the multilevel converter (4) such that the multilevel converter (4) provides output-side phase voltages corresponding to the output-side target phase voltages (U1*, U2*, U3*). The control device repeatedly executes these steps with a cycle time (TZ).

The invention relates to the technical field of electrode paste, in particular to electrode paste for a submerged arc furnace and a preparation method of the electrode paste. Comprising three-level grain size distribution anthracite aggregate which is electrically calcined at high temperature and modified by a KH-550 silane coupling agent, a modified silicon carbide whisker and boron-doped graphene-like carbon nitride composite filler, a maleic anhydride-mediated compatible medium-temperature pitch-polyborosiloxane binder and a graphite powder-borax functional additive. A step-by-step mixing and two-stage sintering process is adopted in the preparation process, a covalent bond interface bridging structure is constructed through the coupling agent, the composite dispersing agent regulates and controls the multi-dimensional network distribution of the filler, and the process synergistically improves the compactness and the interface bonding force of the green body. The electrode paste is firm in interface bonding, can form a ceramic protective phase at a high temperature, has excellent conductivity and mechanical strength, and prolongs the service life of the electrode paste for the submerged arc furnace.

Electrodes (1) of a three-phase arc furnace (2) are supplied with electrical energy by a multilevel converter (4) via a furnace transformer (3). Output phase currents (I1, I2, I3) flowing on the output side of the multilevel converter (4) are known to a control device (15) of the multilevel converter (4). The control device (15) determines first output phase voltage components (U11*, U12*, U13* for the respective current point in time, such that a complex first output voltage (U1*) determined by the first output phase voltage components (U11*, U12*, U13*) is oriented in the complex plane parallel to a complex output current (I) determined by the output phase currents (I1, I2, I3).The control device (15) determines second output-side phase voltage components (U21*, U22*, U23*) such that a complex second output-side voltage (U2*) determined by the second output-side phase voltage components (U21*, U22*, U23*) is oriented orthogonally to the complex first output-side voltage (U1*) in the complex plane. The control device (15) controls the multilevel converter (4) such that the multilevel converter (4) provides output-side phase voltages corresponding to the sums of the first and second output-side phase voltage components (U11*, U12*, U13*, U21*, U22*, U23*). The control device (15) repeatedly executes the aforementioned steps with a cycle time (TZ).

The invention concerns a method to supply electric power to furnaces (100) for melting and / or heating metal materials (M), which provides the supply of a mains voltage (Ur) and a mains current (Ir), both having a predefined mains frequency (fr); the transformation of said mains voltage (Ur) and mains current (Ir) into selectively settable alternating secondary voltage (Us) and secondary current (Is); the rectifying of said secondary voltage (Us) and secondary current (Is) and the conversion of the direct intermediate voltage (Ui) and intermediate current (Ii) into selectively settable alternating supply voltage (Ua) and supply current (Ia); the feeding of said supply voltage (Ua) and supply current (Ia) to a plurality of electrodes (102) of the furnace (100). The invention also concerns an apparatus (10) for supplying electric power to furnaces (100) for melting and / or heating metal materials (M).

The present invention discloses a precise heating control method, device, equipment and storage medium for an electric stove, which relates to the field of electric stove heating control. The method includes: constructing a target input vector according to the obtained cookware type, cookware material, the temperature of the center point of the cookware at the current moment, and the working state information of the plasma electrode of the electric stove at the current moment; inputting the target input vector into a temperature prediction model trained by a historical sample data set, and predicting the target prediction temperature of the target input vector at the next moment through the temperature prediction model; adjusting the power output strategy of the plasma electrode of the electric stove according to the relationship between the target prediction temperature and the preset working temperature. The present invention can precisely control the power output distribution of the plasma electrode according to the cookware material, cookware type and heating requirements.

The invention discloses an efficient electric flame furnace end and an electric flame stove. The efficient electric flame furnace end comprises a shell, a single anode needle, a single cathode tube, a ceramic tube, an air duct inner wall, an air duct outer wall, a heating coil and an airflow generation assembly. The single anode needle and the single cathode tube are arranged, the actual discharge gap between the single anode needle and the single cathode tube can be set to be 10-20 cm and is far larger than the preset discharge distance, air thermal breakdown can still be achieved by adopting stable breakdown voltage in the prior art, extra voltage increase is not needed, meanwhile, the long-distance arrangement of the single anode needle and the single cathode tube is achieved, and the service life of the anode needle and the cathode tube is prolonged. The collision probability of gas molecules and electric field electrons is increased through the long arc, and high-efficiency heating is achieved; in addition, due to the arrangement of the single anode needle and the single cathode tube, the structure of the furnace end is simplified, the number of electrodes and a complex arrangement structure are reduced, and the assembly difficulty and the production and manufacturing cost are reduced; and meanwhile, the simplified structure enables air flow in the furnace end to be smoother, electric field distribution to be more concentrated, and the problems of mutual interference among multiple electrodes, electric field disorder and unstable discharge are avoided.

The invention discloses an electric stove accurate heating control method, device and equipment and a storage medium, and relates to the field of electric stove heating control. The method comprises the following steps: constructing a target input vector according to the acquired cooker type and cooker material of a cooker arranged on the electric stove, the center point temperature of the cooker at the current moment and the working state information of a plasma electrode of the electric stove at the current moment; inputting the target input vector into a temperature prediction model trained through a historical sample data set, and predicting a target prediction temperature of the target input vector at the next moment through the temperature prediction model; and adjusting a power output strategy of a plasma electrode of the electric stove according to a relation between the target predicted temperature and the preset working temperature. According to the invention, the output power distribution of the plasma electrode can be accurately regulated and controlled according to the material of the cookware, the type of the cookware and the heating requirement.

A hybrid ultra-high enthalpy arc heater comprises a rear electrode group, a contraction section, a compression channel, a throat, an expansion section, and a front electrode group. The arc cathode is attached to the electrode of the rear electrode group. The contraction section is mainly used to compress the arc column, completing the first plasma acceleration. The compression channel is used to compress and elongate the arc column, fully heating and ionizing the working gas. The airflow is concentrated to high pressure at the throat, completing the second plasma acceleration. The airflow completes the third plasma acceleration in the expansion section. The arc cathode is attached to the electrode terminal of the front electrode group, where the plasma is subjected to the Lorentz force, achieving the fourth acceleration and ultimately forming an ultra-high enthalpy flow field. This invention can be applied to the field of aerodynamic thermal ground simulation technology research, mainly providing medium and low pressure ultra-high enthalpy uniform flow fields.

The utility model relates to electrode holder sealing technical field, concretely is a kind of ore-heating furnace electrode holder sealing sleeve, including annular water cooling jacket, the sealing ring and sealing ring locking assembly of being arranged in water cooling jacket, platen assembly on water cooling jacket;The sealing ring locking assembly includes two half-round hoops and two screw rods, the end of two The hoop is connected by two screw rods respectively and is annular and located the outside of sealing ring, nut is equipped on the screw rod, the compression spring between the nut and the hoop end portion is set on the screw rod sleeve location.The utility model sealing ring adopts alloy copper H94 material, with high strength, wear resistance and ductility, its upper and lower two parts are each by multiple equal division sector half ring constitutes, by stainless steel hoop and compression spring form adjustable hold tight force.When protective sleeve generates reaction force due to error or deformation, compression spring can slightly loosen, both can adapt holder action, and can maintain sealing pressure, effectively block high-temperature gas and dust leakage.

The utility model relates to the technical field of graphite electrode devices, in particular to a steelmaking anti-oxidation graphite electrode device which comprises an anti-oxidation graphite electrode steelmaking device mechanism. The anti-oxidation graphite electrode steelmaking device mechanism comprises a first anti-oxidation graphite electrode shell, a second anti-oxidation graphite electrode shell, a first steelmaking device fixing plate, a steelmaking inlet, an inlet base, a second steelmaking device fixing plate and a first supporting column. When the equipment is operated, materials are put into the steel-making conveying pipeline through the steel-making inlet, the heating equipment and the cooling equipment are started through the control equipment to work, and when refining of the materials is completed, the control equipment is used again to open the steel-making outlet so that the materials can reach the steel-making storage plate through the steel-making conveying pipeline to be stored. The equipment has the beneficial effects that the heating equipment is assembled, so that raw materials and metal can be rapidly heated, the production efficiency in the steelmaking process is improved, and the temperature in the furnace is accurately controlled.

The utility model discloses an auxiliary electrode of a direct-current electric arc furnace, which belongs to the technical field of electric arc furnaces and is characterized in that an auxiliary anode is arranged, so that the cathode current of the electric arc furnace is increased under the condition that the anode current of the electric arc furnace is not changed, and the temperature of a cathode molten pool of the electric arc furnace is increased; the auxiliary anode does not need to be additionally provided with a direct-current power supply, the silicon controlled rectifier power supplies of the anode and the cathode of the electric arc furnace are directly utilized, the equipment investment is greatly reduced, the power supply structure is simplified, and the silicon controlled rectifier four-electrode without the bottom electrode is also suitable for the direct-current electric arc furnace with six or more electrodes. The two IGBTs can be combined into one IGBT.

The invention relates to a pressure ring assembly, a pressure ring section and a wedge connector between pressure ring sections. The pressure ring assembly (10) includes at least a first section (12.1) and a second section (12.2) connected to each other in an abutting relationship by a removable wedge connector (14) including a first fork (36) and a second fork (38). Each section comprises a body (20) extending in an arcuate manner between a first side wall (22) and a second side wall (24) thereof. Each section defines a first elongated aperture (26) and a second elongated aperture (28). Each hole has a rounded wall section (30) facing the adjacent side wall with a radius of at least 15 mm. The first fork and the second fork are separated from each other at an angle less than 15 degrees. The first fork extends into the second bore of the first section and the second fork extends into the first bore of the second section. The mutually facing contact surfaces (46, 48) of the first and second forks have a contour complementary to the rounded wall section (30) of the bore.

The converter device is configured to convert a DC voltage and a DC current into an AC voltage and an AC current that is supplied to a load (L). The converter device comprises a bank (11) of capacitors (12), a plurality of power semiconductors (13), a heat sink (14), and a casing (15).

This invention discloses a feeding device and a feeding method for electrodes in an electronic glass furnace, belonging to the field of auxiliary equipment for electronic glass furnaces, comprising: a drive gear, an output gear, a drive motor, a connecting component, and a fixed motion component; wherein several output gears are each toothed with the drive gear, wherein both the output gears and the drive gear are rotatably mounted on the fixed motion component, wherein the front end of the transmission shaft of the output gears is connected to the connecting component, wherein the output gear is connected via the connecting component to the feed threaded rod of the electrode in the electronic glass furnace in use and is driven synchronously, wherein the rear end of the central shaft of the drive gear is connected to the drive motor.This invention solves the problem, according to the prior art, that the feed accuracy of the feed thread rod is low when inserting the electrode.

A dual electrode DC electric arc melter 10 for a conductive material 12 comprises a vessel 14 for holding the material. The vessel comprises a sidewall 16, a roof 18 and a bottom 20 and defines a taphole 22 for molten metal. A tilting mechanism 24 enables selective tilting of the vessel to tap the molten metal from the vessel. First 26 and second 28 electrodes, in a normal operative position, extend through the roof into the vessel. An electrode manipulating arrangement 30 is configured to move the electrodes between the normal operative position and a position away from the vessel. A DC power system 32 drives via a DC output the first electrode as a cathode and the second electrode as an anode. An arc deflection compensation circuit 50 is provided for reducing deflection towards the sidewall of arcs extending from the first and second electrodes.

The invention discloses a modified additive, electrode paste based on the modified additive and a preparation method of the electrode paste, and belongs to the technical field of electrode paste preparation. The preparation method comprises the following steps: by taking asphalt compositely modified by natural latex and nano silicon dioxide as a core, constructing a carboxylated nano cellulose connecting layer on the surface of the core through an emulsification technology, then constructing a graphene oxide shell layer outside the connecting layer, and drying to form a modified additive with a core-shell structure; the modified additive disclosed by the invention can restrain the core asphalt in the electrode paste sintering stage, prevent the core asphalt from flowing too early, and stabilize the paste column form to restrain layering; carboxylated nanocellulose is carbonized at high temperature to generate short-range carbon fibers, graphene oxide is reduced into reduced graphene oxide, the short-range carbon fibers and the reduced graphene oxide are interwoven with a modified asphalt coking product to form a composite reinforced network, and the mechanical strength and toughness of the electrode are improved; the modified additive disclosed by the invention is added into aggregate, powder and an adhesive in a dry mixing stage to prepare the electrode paste based on the modified additive, and the electrode paste has relatively good hard fracture resistance.

The power supply system (1) for arc furnace (2), includes: - a power converter (9), and - a polyphase transformer (10), The power supply system further comprises first disconnecting means (13) connecting the input of the power converter to the primary circuit, second disconnecting means (14) connecting the output of the power converter to the primary circuit, and the power supply system further comprises a control circuit (11) configured: o to control the power converter to supply the electrode and to stabilize the courant and the voltage delivered by the grid to reduce reactions in the grid when the first disconnecting means are open and the second disconnecting means are closed, and o to control the power converter to stabilize the courant and the voltage delivered by the grid to reduce reactions in the grid when the first disconnecting means are closed and the second disconnecting means are open.

The utility model relates to a graphite electrode structure, and belongs to the technical field of graphite electrodes. The graphite electrode assembly comprises a graphite reducer union, a graphite screw rod, a graphite joint and a graphite electrode, a first internal threaded hole and a second internal threaded hole are formed in the graphite reducer union, the first internal threaded hole is formed above the second internal threaded hole, the diameter of the first internal threaded hole is larger than that of the second internal threaded hole, and the first internal threaded hole is in threaded connection with an external thread of a copper rod; the upper end of the graphite screw rod is in threaded connection with the second inner threaded hole; the graphite joint is provided with an internal thread and is in threaded connection with the lower end of the graphite screw rod, so that the upper end surface of the graphite joint is propped against the lower end surface of the graphite reducing joint; the graphite electrode comprises an upper end part and a body part, the body part is arranged below the upper end part, the upper end part is provided with an external thread, the external thread of the upper end part is in threaded connection with the internal thread of the graphite joint, and the body part is used for discharging. The graphite electrode has the effect of improving the problem that the graphite electrode is prone to arc breaking.

The utility model relates to the technical field of ladle furnaces, and particularly discloses a ladle furnace electrode base mounting mechanism which comprises a lifting hydraulic cylinder, the output end of the lifting hydraulic cylinder is vertically upward and is connected with a horizontal fixing plate, the horizontal fixing plate is connected with three clamping heads, the three clamping heads clamp three electrodes respectively, a supporting frame is arranged on the horizontal fixing plate, and the supporting frame is connected with the lifting hydraulic cylinder. The top end of the supporting frame is connected with the top flat plate, the three adjusting hydraulic cylinders are arranged on the top flat plate and correspond to the three electrodes respectively, the heights of the three electrodes can be independently adjusted, the independence and pertinence of electrode adjustment are improved, meanwhile, each electrode is adjusted through the upper lifting mechanism and the lower lifting mechanism, and therefore the electrode adjusting efficiency is improved. And the output end of the adjusting hydraulic cylinder vertically and downwards penetrates through the top flat plate and is connected with the adjusting clamp, the electrode can be subjected to multi-point-position clamping and fixing in combination with clamping of the clamping head on the middle portion of the electrode, and the clamping and fixing effect is improved.

A method for determining the length of the electrodes of a submerged arc furnace and the position of those electrodes relative to the furnace hearth, characterised in that the voltage of the electrodes is measured between the bottom of the furnace hearth and the moving terminals on the electrode casings in their upper position and the current derivatives measured on the secondary side of the transformer to determine the electrical parameters of the area immediately surrounding the electrodes, following which the length of the electrodes is calculated, with measurements being taken at the time iek(tk) at which both the electrode current iek(tk) and the desired voltage waveform on the equivalent resistance of the peri-electrode area uek(tk) take the value of zero. The invention also comprises a measuring system for determining the resistance of the electrodes (1, 2, 3) of a submerged arc furnace (4) supplied from a furnace transformer (5), characterised in that it comprises a Rogowski coil system (RC1, RC2, RC3) for measuring the current derivatives in the high-current line supplying the electrode array (1, 2, 3) and an array of voltmeters (7, 8, 9) for measuring the voltage between the counter-electrode and the predetermined moving terminal of the a given electrode (1, 2, 3) on the electrode casing the upper position of the electrodes.

The invention relates to a system and method for bottom electrode compound bottom blowing of multi-media of DC electric arc furnace, which belongs to the field of steelmaking technology. The system includes a plurality of bottom electrodes located at the bottom of furnace, wherein some of the bottom electrodes are bottom blowing electrodes with hollow structures, and some of the bottom blowing electrodes are at least one type of Type I bottom electrode, Type II bottom electrode and Type III bottom electrode; the Type I bottom electrode is used to blow carbonaceous materials into the molten pool to carburize the molten pool to accelerate scrap melting; the Type II bottom electrode is used to blow slagging powder into the molten pool to form molten slag particles in the molten metal to increase the gas-slag-gold three-phase reaction interface area during the dephosphorization reaction; the Type III bottom electrode is used to blow gas into the molten pool to accelerate mass transfer in the molten pool; the system also includes a control unit connected to the bottom blowing electrode to realize online adjustment of the blowing parameters in combination with the power supply intensity of the bottom blowing electrode during the smelting process. The invention can improve production efficiency and reduce consumption of raw and auxiliary materials.

A DC arc furnace 10 comprises a vessel 12 comprising a roof 14, a base 16 and a sidewall 18. The vessel defines a chamber 20 for a body of material having an upper surface 44. An anode electrode 24 and a cathode electrode 26 extend parallel to one another and terminate a distance d from the upper surface. The anode and cathode are located on a first horizontal line 28 and define a gap between them. A first conductor 36 links a positive pole 32 to the anode and a second conductor 38 links a negative pole to the cathode. The first conductor comprises a first section 36.1 extending continuously underneath the base parallel to the first line, so that current flows in the first section in a direction A directly opposite to current flow B through the body of material between the anode and the cathode.

The application discloses a kind of high-efficiency electric flame burner and electric flame stove, shell, single anode needle, single cathode tube, ceramic tube, air duct inner wall, air duct outer wall, heating coil and airflow generating assembly.Single anode needle and single cathode tube are provided, and the actual discharge gap of both can be set to 10-20CM, which is much larger than the preset discharge distance. Using the stable breakdown voltage of the prior art, air thermal breakdown can still be achieved without additional voltage increase. At the same time, the long-distance arrangement of the single anode needle and the single cathode tube increases the collision probability of gas molecules and electric field electrons for long arcs, achieving high-efficiency heating. In addition, the arrangement of the single anode needle and the single cathode tube simplifies the structure of the burner, reduces the number of electrodes and the complex arrangement structure, and reduces the assembly difficulty and production cost. At the same time, the simplified structure makes the airflow in the burner more smooth and the electric field distribution more concentrated, avoiding the problems of mutual interference between multiple electrodes, electric field disorder and unstable discharge.

The present invention provides a continuous preparation device and method for high-purity single-walled carbon nanotubes. A continuous preparation device for high-purity single-walled carbon nanotubes, the structure of the device includes a plasma arc furnace, a growth chamber, and a discharge chamber arranged in sequence; the structure of the plasma arc furnace includes a hollow graphite cathode, a graphite crucible as the anode, and a furnace chamber. Adopting the structure where the arc evaporation chamber and the growth chamber are separated and share the crucible, heat is transferred to the growth chamber through the molten metal liquid surface in the crucible, which can effectively reduce the amount of catalyst evaporated by the plasma arc furnace entering the growth chamber, and at the same time utilize the high-temperature heat source in the furnace to provide energy for subsequent reactions. Moreover, by adjusting the channel size, the amount of catalyst can be further finely controlled, and even directly use the heat in the growth chamber to slowly evaporate the bottom electrode catalyst, significantly reducing the amount of ineffective catalyst and improving the purity of the final single-walled carbon nanotube product.

The application relates to the technical field of aircraft fairing, and discloses an electric heating assembly and an air inlet fairing applying the electric heating assembly, the electric heating assembly is applied to ice prevention and deicing of the air inlet fairing, and the electric heating assembly comprises a first heating piece and a second heating piece; the first heating piece is arranged from a near tip to a peripheral wall of the air inlet fairing, a first electrode of the first heating piece and the tip of the fairing form a first temperature zone, a second temperature zone is formed between the first electrode and a second electrode, and a first difference value between an average temperature of the second temperature zone and an average temperature of the first temperature zone is obvious to meet the requirement of a higher temperature of the tip; the first temperature zone is arranged to realize directional heating of the tip area, the ice prevention and deicing capacity of the tip area is obviously improved, and the problem of insufficient heating of the tip and easy icing in the prior art is solved.