32results about "Tuyeres" patented technology

The application provides a method for treating blast furnace tuyere coal gas leakage, comprising the following steps: taking the outside of the gap between a large tuyere sleeve and a second tuyere sleeve of a blast furnace tuyere as a polishing surface; polishing the polishing surface to form a rough surface and removing impurities on the rough surface; brushing several layers of epoxy resin on the rough surface, brushing the next layer of epoxy resin after the solidification of each layer of epoxy resin, and forming an adhesion layer after the solidification of each layer of epoxy resin. Compared with the prior art, the method in the scheme polishes and applies glue at the gap between the outside of the large tuyere sleeve and the second tuyere sleeve, forms multiple adhesion layers, blocks the gap, and prevents coal gas leakage.

The utility model provides a special tool suitable for blast furnace fast opening tuyere, including steel fiber, be provided with the beat tray on the outside wall of steel fiber, the outside wall of steel fiber is slidably sleeved with slide hammer, slide hammer sets up in beat tray far from steel drill tip one side, slide hammer is along the axial of steel fiber and is towards beat tray one side slide and hits beat tray, the reaction force that utilizes slide hammer hits generates drive steel fiber to the tip direction movement to open blast furnace tuyere, the utility model discloses a slide hammer along the steel fiber / steel pipe slide hits beat tray's design, replaces traditional many people cooperation mode, only needs 1-2 people to complete operation, saves manpower and time, simultaneously, slide hammer slide hits impact force stability, high frequency, and the efficiency of opening tuyere is greatly improved.

Provided is a method of treating a packed bed contained in a cylindrical vessel, in which circumferential gas flow uniformity inside the cylindrical vessel can be ensured. The method of treating a packed bed contained in a cylindrical vessel includes a process where a first gas rising inside the cylindrical vessel is generated by supplying gas from a supply port at the lower part of the cylindrical vessel, and a second gas is supplied into the cylindrical vessel from n nozzles in the side portion of the cylindrical vessel, and the process is performed with a gas flow uniformity index D, represented by Equation (1), being 0.60 or more, where V1 is the flow rate of the first gas, V2 is the total flow rate of the second gas supplied from the n nozzles, DC is the inner diameter of the cylindrical vessel at the height position of the nozzles, z is the protrusion length of the nozzles from the inner wall surface of the cylindrical vessel, and DN is the horizontal length of nozzle openings. [Math. 1] D=2nπ−DNDC+DNDC2+π22nV2V1+V2+nDNDCπ1−2zDC

This invention discloses a method for installing a blast furnace tuyere sleeve, relating to the field of iron or steel smelting technology, and solving the problems of large lifting weight and high installation difficulty in existing installation methods for blast furnace tuyere sleeves. The technical solution adopted by this invention is as follows: First, a support frame is installed inside the furnace shell at the blast furnace tuyere location; then, the tuyere sleeve is lifted to the blast furnace tuyere location outside the furnace shell, with the tuyere sleeve connected to a cable, using the support frame as the pulling force point, and the tuyere sleeve is pulled into the blast furnace tuyere through the cable; finally, the tuyere sleeve is secured, and then the cable is released. This invention is used to lift and install the tuyere sleeve at the blast furnace tuyere, achieving the purpose of rapid and accurate installation of the tuyere sleeve.

This steelmaking system comprises an electric arc furnace (EAF) for preparing molten steel, an electric smelting furnace (ESF) for preparing molten iron, a recovery device for separating reduced iron from off-gas discharged from the electric smelting furnace, and a separation guide for supplying the reduced iron, which is separated in the recovery device, to the electric arc furnace.

The invention relates to an injection nozzle (1) and a method for operating a metallurgical furnace.

The present invention provides a tuyere comprising a conical hollow tuyere body having an inner surface and an outer surface. The present tuyere extends along a first axis from an inlet end to an opposite outlet end. The tuyere body has a tip of the tuyere at the outlet end and a conical connection surface at the inlet end. The conical connection surface is configured to engage a conical seat of a tuyere holder or a tuyere cooler. Advantageously, the tuyere further comprises a corrugated portion on the outer surface of the tuyere. The corrugated portion comprises at least one recess having an open curved contour and a surface surrounding the at least one recess. The corrugated portion is arranged and configured to support the charged material and form a scaffold for the charged material during the operation of the metallurgical furnace.

This invention discloses a stratified and zoned differentiated CO2 injection system and method for blast furnaces, belonging to the field of low-carbon technology in iron and steel metallurgy. The system includes a CO2 supply and distribution system, a tuyere zone injection module, a lower and middle section injection module, and an upper section injection module. Based on the internal temperature gradient and atmosphere stratification characteristics of the blast furnace, a differentiated CO2 distribution ratio and a synergistic heat compensation strategy are adopted. An oxygen-rich CH4 synergistic injection device is configured in the tuyere zone to promote rapid CO2 conversion using a high-temperature, strong reducing atmosphere; a biomass char synergistic injection device and adjustable-angle nozzles are configured in the lower and middle section of the furnace to achieve efficient gasification; and a low-concentration CO2 mixed injection is used in the upper section of the furnace to promote indirect reduction reactions. This invention achieves a CO2 conversion rate of 65-80%, a coke ratio reduction of 15-25%, and CO2 consumption of 60-90 Nm³ per ton of iron. 3 This significantly reduces carbon emissions and improves ironmaking efficiency.

This utility model relates to the field of blast furnace technology, specifically to a special tool for blocking blast furnace tuyeres and a pulverized coal injection (PCI) system. The special tool for blocking blast furnace tuyeres is used to inject a sodium silicate aqueous solution into a PCI system. The PCI system includes a PCI body and a coal conveying pipeline. A branch pipe is connected to the coal conveying pipeline, and a branch valve is installed on the branch pipe to control its on / off state. The special tool includes a purge pipe, a solution tank, and a connecting pipe connected in sequence. The end of the purge pipe away from the solution tank is connected to an air compressor, and the purge pipe is detachably connected to the solution tank. The special tool is connected to the coal conveying pipeline via the branch pipe. The sodium silicate aqueous solution is blown into the PCI body by the air compressor, mixes with the pulverized coal air from the coal conveying pipeline, and is then sprayed. This eliminates the problem of discontinuous air supply and effectively prevents the PCI clogging.

This utility model belongs to the field of blast furnace equipment in metallurgy and ironmaking, specifically relating to a device for preventing the blast furnace tuyeres from warping during production. It includes a tuyeres sleeve, with a large sleeve surface on the side closer to the large sleeve and a small sleeve surface on the side closer to the small sleeve. A threaded hole is formed on the large sleeve surface, and a threaded hole is formed on the small sleeve surface. A large reinforcing disc is fixedly connected to the end face of the large sleeve surface, and a small reinforcing disc is fixedly connected to the end face of the small sleeve surface. This device prevents the blast furnace tuyeres sleeve from warping during production by adding a large reinforcing disc and a small reinforcing disc to the large and small sleeve surfaces of the tuyeres sleeve, respectively, forming a double-end rigid support structure. Combined with the staggered layout of circumferentially distributed threaded holes and mounting holes, the overall bending stiffness of the tuyeres sleeve is improved. Under high-temperature conditions of 1200℃, the circumferential thermal deformation is significantly reduced, effectively preventing sealing failure caused by warping deformation.

The utility model relates to the technical field of blast furnace coal injection, and provides a blast furnace coal injection device which comprises a feeding cover and a plurality of bottom frames, the bottom frames are all fixed to the bottom of the feeding cover, a feeding pipeline is arranged on the outer side of the feeding cover, a feeding assembly is arranged in the feeding cover and the feeding pipeline, and the feeding assembly is arranged in the feeding cover and the feeding pipeline. The air inlet assembly is arranged at the inner bottom of the feeding cover, the feeding assembly comprises a spiral auger, the spiral auger is installed in a feeding pipeline, a dispersing cover is arranged on the periphery of the interior of the feeding cover, the feeding pipeline is communicated with the interior of the dispersing cover, a plurality of inlets are formed in the periphery of the bottom of the dispersing cover, and a pair of sliding rails is arranged at the top of the dispersing cover; a rotating cover is slidably connected to the sliding rail, a plurality of pushing plates are arranged on the bottom face of the rotating cover, and a protruding layer is arranged on the surface of the rotating cover. By means of the technical scheme, the technical problems that in the prior art, due to the technical bottlenecks of uneven feeding and excessive internal residues, the pulverized coal conveying efficiency is low, and combustion is insufficient are solved.

The present invention relates to a tuyere stock comprising a valve adapted to control the flow of a gas having a temperature of at least 800 °C into a furnace, the valve comprising (a) a valve body having a longitudinal axis and an inner wall defining a flow path for the gas along the axis, the flow path having a cross-sectional area perpendicular to the axis; (b) a trim assembly comprising multiple shutter elements and a drive assembly adapted to reversibly displace the multiple shutter elements through the inner wall of the valve body into the flow path in the plane of the cross-sectional area, the cross-sectional area of the flow path being concentrically reduced when the multiple shutter elements are displaced into the flow path.

To provide a pig iron production method capable of improving the gas permeability of a blast furnace and ore raw material.SOLUTION: A pig iron production method according to an embodiment of the present invention produces pig iron using a blast furnace having a tuyere and includes: a step of laminating a first layer comprising ore raw material and a second layer comprising cokes alternately at the inside of the blast furnace; and a step of reducing and melting the raw material of the laminated first layer while blowing auxiliary fuel into the blast furnace by hot wind fed from the tuyere. The ore raw material comprises plural reduced iron molded bodies obtained by compression-molding reduced iron, the shape of each reduced iron molded body has swelling in which the central part is thicker than the circumferential part at both faces and is the chamfered rectangular one in a plane view, and the length ratio of the long side with respect to the short side of each reduced iron molded body in a plane view is 1.5 or less.SELECTED DRAWING: Figure 1

A method for operating a smelting furnace installation, in particular a blast furnace installation, includes the following steps:feeding coke, iron oxide containing material and if required fluxing agents to the top of the smelting furnace;injecting a first reducing gas containing hydrogen at a tuyere level of the smelting furnace at a temperature above 1600° C.;injecting oxygen at the tuyere level of the smelting furnace; andinjecting a second reducing gas at a lower shaft level of the smelting furnace. Coke is fed at a lump coke rate below 220 kg / t HM and wherein the rate of oxygen injected at the tuyere level is below 120 Nm3 / t HM.

A novel method for manufacturing a high-wear-resistant and high-thermal-conductivity vent sleeve includes the following steps: (1) machining a groove on the surface of the copper substrate at the front end of the vent sleeve; (2) preheating the front end of the vent sleeve; (3) brushing or sprinkling flux on the inner wall of the groove, and then filling the groove with flux-cored solder; the flux-cored solder includes an outer skin and a core material, the outer skin being made of pure copper; the core material contains hard material powder, copper-phosphorus solder powder, activator, and adhesive material; (4) while the vent sleeve rotates around its axis, locally heating the part of the vent sleeve with the groove at the front end, so that the flux-cored solder in the groove gradually melts and forms a metallurgical bond with the copper substrate at the front end of the vent sleeve; (5) cooling to solidify the material in the groove. This invention can form a wear-resistant structure on the surface of the front end of the vent sleeve, improve the wear resistance of the front end of the vent sleeve, improve the thermal conductivity between the wear-resistant structure and the copper substrate, and make the wear-resistant structure less prone to falling off.

The present invention relates to a gas injection system for a blast furnace, shaft furnace, or metallurgical furnace having a furnace wall (12) and a cooling plate (18), the gas injection system comprising a gas distribution pipe (14) and one or more injectors (16) having a nozzle, the nozzle having a ceramic insert (52), a cooling element (18) having a hot side facing away from the furnace wall (12), a protrusion (54) attached to the hot side of the cooling plate, the ceramic insert (52) traversing the furnace wall and the cooling plate and the protrusion on the cooling plate, the ceramic insert (52) having an adaptable length so that the ceramic insert (52) protrudes into the furnace, is flush with the hot surface of the cooling plate (18), or is slightly recessed from the hot surface of the cooling plate (18).

The application discloses a method and equipment for distributing oxygen in an oxygen-coal gun and blast, which comprises the following steps: establishing a geometric model of the oxygen-coal gun, a direct blowing pipe, a tuyere and a revolving zone, determining a gas phase basic control equation and a control equation between the gas phase and particles, defining equation iteration parameters based on current distribution data of oxygen in the oxygen-coal gun and the blast, and iterating the two equations, and then screening a first fly ash mass fraction before combustion, a second fly ash mass fraction after combustion, a high-temperature heat flow temperature and a tuyere surface temperature of the revolving zone from the converged calculation results; determining a pulverized coal burnout rate according to the first fly ash mass fraction and the second fly ash mass fraction, and determining a heat flow density according to the high-temperature heat flow temperature and the tuyere surface temperature; and determining whether the current distribution data is optimal distribution data according to the pulverized coal burnout rate and the heat flow density. Production according to the optimal distribution data can not only improve fuel utilization rate, but also avoid tuyere melting loss and erosion, and thus yield and income are increased.

The present application belongs to the technical field of steel metallurgy, and particularly relates to a method for quickly repairing the furnace type of a cooling plate blast furnace in the later stage of the furnace campaign, comprising the following contents: (1) shortening the maintenance period: the maintenance period is shortened from the normal 4-5 months to 2-3 months; (2) furnace shell hole: taking advantage of the opportunity of the regular inspection, a grouting hole is arranged at the position where the cooling shield cracks and the furnace shell cracks; (3) dredging the grouting hole: after the ball valve of the grouting hole is removed, the electric hammer is used to dredge the residual refractory or slag shell in the furnace; (4) grouting and pressing into the material: taking advantage of the opportunity of the regular inspection, the prepared hard pressing material is pressed into the furnace through the new grouting hole and the old grouting hole by using the grouting machine; (5) controlling the airflow: after the air supply is maintained, the charging system is optimized, and the platform of the ore and coke is widened at the same time; (6) extending the maintenance time: the maintenance time is extended to more than 28 hours. The method improves the quality of the hard pressing, makes the hard pressing material stay in the furnace for a long time, and extends the stable operation period of the furnace type.

The utility model discloses a device of quick back installation tuyere and two sets belongs to metallurgical equipment technical field, has solved the problem of the existing installation process needing many people cooperation, low efficiency, poor sealing effect after installation. The utility model discloses including work table and push -and -pull rod, be equipped with locating plate and two fixed plate on the work table, two fixed plate center is equipped with the opening, and the both sides opening is installed with the roll, and the locating plate is installed in the side portion of roll, and the locating plate center is equipped with the locating hole, and the push -and -pull rod passes through the locating hole and is tangent with roll. The utility model discloses simple structure, stable operation can simplify tuyere and two sets replacement operation process, ensure installation precision, and the device is convenient for operating personnel to carry and adjust, has very strong popularization.

The utility model provides a device capable of quickly and safely opening and blocking blast furnace tuyere, belongs to blast furnace production equipment technical field, is used for quickly and safely opening and blocking blast furnace tuyere, its technical scheme is: tuyere blocking brick is by blocking brick body, wire netting, steel wire rope is formed, blocking brick body is cylinder, the diameter of cylinder is matched with blast furnace tuyere diameter, wire netting is cast in blocking brick body, one end of steel wire rope is embedded in blocking brick body and is connected with wire netting, the other end of steel wire rope is pulled out with the end face of blocking brick body and is connected with cylinder, support is fixed outside blast furnace blowpipe big lid, cylinder is installed on support, cylinder is connected with speed reducer, speed reducer is connected with motor. The utility model discloses simple structure, convenient to use can open the tuyere blocking brick of blocking blast furnace tuyere quickly, alleviates the labor intensity of worker, and can avoid the burn of high temperature gas of blast furnace tuyere to operating personnel, eliminates the hidden danger, guarantees the smooth progress of production.

The present invention relates to a tuyere stock comprising a valve adapted to control the flow of a gas having a temperature of at least 800 °C into a furnace, the valve comprising (a) a valve body having a longitudinal axis and an inner wall defining a flow path for the gas along the axis, the flow path having a cross-sectional area perpendicular to the axis; (b) a trim assembly comprising multiple shutter elements and a drive assembly adapted to reversibly displace the multiple shutter elements through the inner wall of the valve body into the flow path in the plane of the cross-sectional area, the cross-sectional area of the flow path being concentrically reduced when the multiple shutter elements are displaced into the flow path.

The utility model discloses a blast furnace ironmaking air inlet device with cooling structure, including base and the air inlet pipe of setting in the upper portion of base, the outer surface of air inlet pipe is fixedly connected with the outer layer cylinder along its length direction, and the cavity of tubular is formed between the outer surface of outer layer cylinder and air inlet pipe, and the inside of cavity is fixedly connected with a plurality of partition rings evenly and interval along its length direction, the utility model relates to blast furnace ironmaking technical field. This blast furnace ironmaking air inlet device with cooling structure, through setting up outer layer cylinder and a plurality of partition rings, this device fixes outer layer cylinder on the outer surface of air inlet pipe, and installs a plurality of partition rings in its inside, and the cavity between outer layer cylinder and air inlet pipe is divided and forms a plurality of annular heat exchange cavities, then through a plurality of liquid inlet branch pipes and a plurality of liquid outlet branch pipes respectively to a plurality of heat exchange cavities inside conveying and discharging heat exchange fluid, by this can guarantee that the whole pipe body of air inlet pipe is evenly cooled, and the phenomenon that temperature distribution is uneven will not appear.

The application relates to a method for manufacturing a blast furnace tuyere blocking brick, and belongs to the technical field of blast furnace iron-making. The method comprises the following manufacturing steps: applying a release agent in advance in a brick manufacturing mold to facilitate demolding; mixing and stirring castable material and water in a certain proportion, and pouring the mixture into the brick manufacturing mold; inserting a solid rod into the center of the castable material before the castable material dries, so as to manufacture a castable material hole; and demolding after the castable material completely dries, and the tuyere blocking brick is manufactured. The blast furnace tuyere blocking brick manufactured by the method has certain high-temperature resistance and suitable strength, and other excellent properties, so that the blast furnace tuyere blocking brick can be in a relatively stable hardness for a long time, thereby reducing the working strength of workers.

This utility model discloses an emergency continuous pulverized coal injection device for blast furnace pulverized coal injection pipelines. It includes main injection pipelines #1 and #2, and several injection tanks connected to these pipelines. Flexible connecting pipes are installed on the pipelines connecting the injection tanks to the main injection pipelines. A pulverized coal intelligent regulating valve is installed at the upper end of each flexible connecting pipe, and a pulverized coal shut-off valve is installed at the lower end of each flexible connecting pipe. An emergency pipeline is installed between the #3 injection tank (closest to the #2 injection pipeline and connected to the #1 injection pipeline) and the #2 injection pipeline. The emergency pipeline is located at the lower end of the flexible connecting pipes. A first manual valve, a gas replenishment manual valve, and a second manual valve are sequentially installed on the emergency pipeline. A manual valve for the #2 pipeline is installed at the front end of the connection between the #2 injection pipeline and the emergency pipeline. This utility model eliminates blast furnace pulverized coal injection shutdowns caused by damage to flexible connecting pipes, pipelines, or valves, ensuring uninterrupted pulverized coal injection into the blast furnace.