22results about How to "Prevent slagging" patented technology

This utility model discloses an electroslag remelting furnace for mold steel, relating to the field of metallurgical technology. It includes a base, a coil, and a lifting mechanism. A multi-stage crystallizer is fixedly installed on the base. The multi-stage crystallizer consists of multiple individual crystallizers, each with its own cooling chamber. A mounting base is fixedly installed at the upper end of the multi-stage crystallizer, and a sealing mechanism is fixedly installed at the upper end of the mounting base. The beneficial effect lies in the fact that the weight of the electrodes is detected by a pressure sensor. Based on the change in electrode weight, the magnitude of the magnetic field generated by the coil is adjusted, thereby improving the flow of the molten pool within the multi-stage crystallizer, reducing segregation, and preventing excessive turbulence that could lead to slag entrapment. Furthermore, the independent crystallizers and individual cooling chambers allow for different melting processes of the electroslag in different areas, avoiding uneven cooling or temperature imbalance during the melting process and effectively improving the crystallization quality of the product.

The invention discloses a composite structure mass block for gravity energy storage and a rapid production method of the composite structure mass block. The composite structure mass block comprises a solidified muck core, a cement bonding layer, a stainless steel shell and a concrete bottom plate. The solidified muck core is of a cuboid structure which is horizontally and transversely arranged, stainless steel shells are vertically arranged on the side faces of the periphery of the solidified muck core in an aligned mode, the stainless steel shells and the corresponding side faces of the solidified muck core are arranged in a spaced mode, and the upper end and the lower end of each stainless steel shell are horizontally turned towards the direction of the solidified muck core to form a C shape. A cement bonding layer is filled between the solidified muck core and the stainless steel shell, and the gap between the stainless steel shell and the solidified muck core is completely filled through the cement bonding layer; a concrete bottom plate is horizontally arranged on the lower surface of the solidified muck core, a weight adjusting cavity is formed in the middle of the upper surface of the solidified muck core in an embedded mode, a plurality of through long hollow channels are formed in the upper surface of the solidified muck core relative to the periphery of the weight adjusting cavity in an embedded mode, and then the composite structure mass block is obtained after maintenance and weight compensation of the weight adjusting cavity. The manufacturing efficiency of the gravity energy storage mass block is improved.

The invention discloses magnesium oxide foamed ceramic and a preparation process thereof, and relates to the technical field of foamed ceramic processing, and the preparation process comprises the following steps: mixing waterproof magnesium oxide, zirconium oxide powder, a toughening material and a sintering aid to obtain a magnesium oxide-based mixture, and mixing the magnesium oxide-based mixture, a binder and deionized water to obtain molding slurry; the preparation method comprises the following steps: optimizing the particle size distribution of magnesium oxide, carrying out hydration resistance modification on the magnesium oxide, enhancing the magnesium oxide in an aqueous binder environment by using a flexibilizer composed of zirconium oxide, whiskers and fibers, and carrying out high-temperature sintering to obtain the magnesium oxide-based ceramic with high void ratio. The normal-temperature compressive strength and the high-temperature bending strength of the magnesium oxide-based ceramic are effectively improved, and the thermal shock resistance and the production yield of the magnesium oxide-based ceramic are also improved.

This invention relates to a protective slag for sulfur-containing free-cutting steel crystallizers using photovoltaic silicon mud and its preparation method. The protective slag of this invention contains, by mass percentage, 30.6–31.6 wt% CaO, 36.7–37.7 wt% SiO2, 6.1–7.1 wt% Al2O3, 8.2–9.2 wt% Na2O, 5.0–6.0 wt% F, and 9.0–10.0 wt% C. 固 H2O up to 0.5 wt%; C 固 The carbon in the protective slag is fixed. Raw materials include 7-9 wt% silica mud, 14-16 wt% blast furnace slag, 24-26 wt% phosphorus slag, 14-16 wt% silicate cement, 4-6 wt% wollastonite, 10-12 wt% soda ash, 2-4 wt% fluorite, 6-8 wt% cryolite, and 10-12 wt% carbon powder. The preparation method includes batching, slurry preparation (solid content 40-45%), spray granulation (spray gun orifice diameter 1.0-1.5 mm, inlet temperature 450-480℃), and post-treatment. This invention enables the utilization of photovoltaic silica mud, reducing the cost of protective slag containing silica mud by 870 yuan per ton, and increasing the flaw detection pass rate of continuously cast billets from 25.99% to 55.17%, thus possessing both energy-saving and emission-reduction value and a circular economy value.

The invention discloses a method for producing low-boron steel. The method comprises the step of controlling the slag amount of an electric arc furnace / converter, the use frequency of a refractory material, the addition amount of a silicon alloy and the type of a deoxidizing agent. According to the method, the initial boron content of the molten steel can be reduced, and the external boron content in the production process is reduced, so that the boron content of the steel plate is controlled to be less than or equal to 0.0005%, and the problem that the boron content exceeds the standard in the low-boron steel production process is solved.

The invention discloses a corner tube type biomass boiler and an energy-saving heat supply system.The boiler comprises a horizontal boiler body, a combustor, a plurality of evaporators and a denitration dust removal device, and the horizontal boiler body is provided with a transversely-arranged hearth, a first heat transfer area, a second heat transfer area, a first connecting flue, a second connecting flue, a third connecting flue and a plurality of ash falling hoppers; the hearth is provided with a burner installation opening, a first air inlet and a second air inlet. According to the boiler, the hearth, the first heat transfer area and the second heat transfer area are arranged in a modularized mode, the ash falling hopper, the evaporator, the denitration dust removal device and other structures are matched, the boiler is arranged in a horizontal structure, all the components are modularly delivered, the field installation period can be greatly shortened, meanwhile, the boiler body is subjected to multi-stage heat transfer and ash falling treatment, and the boiler is convenient to use. According to the utility model, the heat transfer process is not influenced by fly ash, and flames can be prevented from directly scouring the heating surface in the hearth, so that the hearth is prevented from slagging or coking, and a better heat exchange effect is achieved.

The invention discloses a 600MW-grade ultra-supercritical tower type liquid deslagging boiler, and relates to a liquid deslagging boiler. The problems that in the prior art, when Zhundong coal is combusted in a solid-state deslagging boiler, serious coking and contamination occur, and then the boiler cannot stably operate are solved. By adopting a liquid deslagging technology, the defects of serious coking and contamination when Zhundong coal is combusted in an existing solid deslagging technology are overcome, and by adopting the double combustion chambers with high combustion heat intensity and a W-shaped combustion structure and coating refractory castable, heat absorption of a water cooling wall is reduced, the temperature in the combustion chambers is increased, ash slag is completely melted, the slag catching rate is increased, and the energy consumption is reduced. Dust content of smoke at a hearth outlet is reduced, and slag bonding and contamination of the hearth and other heating surfaces are prevented. The Zhundong coal with extremely high coking property or other coal types with low ash fusion point can be combusted completely, a key role is played in large-scale development and utilization of the Zhundong coal, and the economic benefit and sustainable development of a power plant are improved. The invention belongs to the technical field of liquid deslagging boilers.

The invention provides a continuous casting process method for controlling inclusions in steel and a tundish. The method comprises the following steps that the position of a tundish retaining wall is moved to a molten steel outflow area; in the continuous casting production process, a covering agent is added in a molten steel inflow area; tundish deslagging is conducted 5-8 minutes before pouring of the large ladle is completed; carrying out slag picking on the crystallizer once 3-6 minutes before changing the water gap every time; and after the water gap is replaced every time and the liquid level of the crystallizer is stable, slag picking of the crystallizer is carried out again. After the technical method is implemented, the inclusion defect rate after continuous casting billet rolling is reduced to 0.12% from 0.46% of a conventional method, and the effect is remarkable.

A flue gas recirculation system for preventing spontaneous combustion of accumulated powder in a medium-speed coal mill coal powder pipeline comprises a medium-speed coal mill, a coal-fired boiler, an induced draft fan and a recirculating flue gas pipeline; the coal-fired boiler comprises a burner, a coal powder pipeline is arranged at the outlet of the medium-speed coal mill, the outlet of the coal powder pipeline is connected to the burner via a mixing pipeline, the coal-fired boiler is connected to the inlet of the induced draft fan, and the outlet of the induced draft fan is divided into two paths, one path discharges flue gas, and the other path is connected to the coal powder pipeline via a recirculating flue gas pipeline. The present invention mixes the low-dust and low-oxygen flue gas at the outlet of the induced draft fan of the coal-fired power station boiler with the air-powder airflow at the outlet of the medium-speed coal mill by setting a recirculating flue gas pipeline, and the oxygen content of the medium after mixing is reduced to less than 14%, effectively preventing the spontaneous combustion of coal powder deposited in the coal powder pipeline, and eliminating the conditions for the occurrence of deflagration in the pulverizing system; the flow rate of the mixed medium is increased by 30% to 50%, preventing the deposition of coal powder in the medium. And prevent boiler slagging caused by high flame temperature in the burner area.

The invention belongs to the technical field of gypsum board production, and particularly relates to a gypsum board length switching automatic adjusting device which comprises a main body mechanism and a gypsum board placed on the main body mechanism and further comprises cases arranged on the two sides of the main body mechanism. By arranging the adjusting component and judging the included angle between the adjusting rod and the horizontal ground and the length of the adjusting rod at the moment, the distance between every two adjacent stopping mechanisms can be measured and calculated, so that the gypsum board fixing device adapts to gypsum boards of various specifications, the downward moving distances of the telescopic columns are equal, and the gypsum board fixing device is suitable for gypsum boards of various specifications. When the adjusting rod on the base faces downwards, the stopping mechanism at one end is pushed outwards, and meanwhile the other set of adjusting components connected with the stopping mechanism are driven to be pushed outwards, so that the movable base and the movable rod need to freely slide to replace positions, adjustment of data parameters is facilitated, and the gears of the telescopic columns are the same; one-key opening only needs the adjusting rod on the base to provide initial force, the distance of the multiple sets of stop mechanisms can be adjusted in an accelerated mode, and one-by-one adjustment is avoided.

The invention discloses a method for refining low-carbon low-sulfur steel through vacuum carbon deoxidation, and relates to the technical field of molten steel external refining. The process method comprises the following steps: carrying out pre-deoxidation by adopting a carbon source alloy material without using a metal deoxidation material; vacuum carbon deoxidation treatment is carried out under the condition that the vacuum degree is smaller than or equal to 100 Pa; the flow of the stirring gas is controlled to be 0.2-1.0 NL / (t.min); controlling the vacuum holding time to be not more than 5 minutes and the vacuum period to be not more than 15 minutes; the method comprises the following steps: controlling the tapping temperature of a primary smelting furnace to be 1620-1680 DEG C; in the LF station refining process, the binary alkalinity of refining slag is controlled to be 5.0-8.0, and diffusion deoxidation and white slag making are conducted in cooperation with a metal deoxidizing agent; the low-carbon and low-sulfur steel is produced through organic combination of vacuum carbon deoxidation and LF refining on the premise that a metal deoxidation material is not used for pre-deoxidation, the total oxygen content in the steel can be controlled to be 15 ppm or below, and the sulfur content can be controlled to be 0.005% or below.

The invention discloses a hot galvanizing sink roll device for preventing the surface of a sink roll from slagging, which comprises a sink roll body and support arms respectively connected with two end parts in the axial direction of the sink roll body, and further comprises heating elements arranged at one ends, far away from the sink roll body, of the support arms. The hot-dip galvanizing sink roll device for preventing the surface of the sink roll from slagging can prevent the surface of the sink roll from slagging, reduce defects caused by zinc dross and obtain better hot-dip galvanizing surface quality.

The invention discloses a preparation device for a PU material foaming piece of vehicle-mounted refrigerator heat preservation cotton, and belongs to the technical field of vehicle-mounted refrigerator heat preservation cotton preparation. The preparation device comprises a supporting table, and a mixing mechanism and a mold closing mechanism are arranged on the upper surface of the supporting table; according to the device, the mixing mechanism is arranged, a fixing sleeve can be driven to synchronously rotate along with rotation of a spiral column, at the moment, the fixing sleeve drives a rotating rod to do circular motion, the rotating rod can drive a transmission gear to move in an inner gear ring, and the transmission gear drives the rotating rod to rotate under the action of the inner gear ring; at the moment, the rotating rod drives the stirring rod to perform circular motion and autorotation in the mixing barrel, so that polyether polyol and isocyanate in the mixing barrel are stirred and mixed, the defects of air holes and hollowing in a foaming piece are effectively avoided, the fluidity of raw materials is improved, impurities and water are removed, sufficient foaming reaction is ensured, and meanwhile, the density uniformity of the foaming piece is also ensured; and the heat preservation performance of the heat preservation cotton for the vehicle-mounted refrigerator is greatly improved.

The utility model discloses an anti-explosion slag flushing jetting device for a blast furnace, which relates to the technical field of blast furnace waste slag flushing, is arranged at the end part of a slag flushing trough and comprises a spray head, a slag flushing nozzle and a slag flushing nozzle, the main nozzle is rectangular and is positioned in the middle of the end part of the slag sluice groove; a first auxiliary nozzle, a second auxiliary nozzle and a third auxiliary nozzle are arranged on the two sides and the lower portion of the main nozzle respectively and correspond to the two side ditch walls and the bottom of the slag flushing ditch respectively. According to the spraying device, slag flushing water can be concentrated, and molten slag can be quickly quenched, scattered and granulated into water granulated slag; slag materials adhered to the side ditch wall and the bottom of the slag flushing ditch are effectively flushed away, and slag accumulation is prevented; different parts of the slag sluice can be sprayed at the same time, the nozzle cannot be blocked, and the risks of water return caused by slag accumulation in the slag sluice and serious physical explosion accidents are effectively avoided; and the fault and shutdown maintenance time is reduced, and the slag flushing efficiency and safety are improved.

The invention discloses a masonry method of a refined steel ladle structure, and relates to the technical field of steel-making equipment production, a steel ladle is provided with a steel ladle bottom structure and a steel ladle wall structure, the steel ladle bottom structure comprises a nozzle seating brick and an air brick, a castable is poured around the nozzle seating brick and the air brick to form a castable layer, and the castable layer is provided with an air inlet and an air outlet. The castable layers comprise a ladle bottom permanent castable layer and a ladle bottom working castable layer from bottom to top; a refining steel ladle nozzle cap is sleeved on the nozzle brick cup, the bottom of the refining steel ladle nozzle cap is tightly attached to the ladle bottom permanent castable layer on the periphery of the nozzle brick cup, and castable is poured on the outer side face of a boss at the bottom of the refining steel ladle nozzle cap and the top of the boss to form a ladle bottom working castable layer. Compared with the prior art, the steel ladle bottom structure has the advantages that molten steel residues are effectively reduced, and slag entrapment in the molten steel pouring process can be prevented at the same time.

The utility model relates to the technical field of pulverized coal boilers, in particular to a boiler structure for burning Zhundong coal, which can avoid slag bonding and ash deposition and ensure normal and stable operation of the boiler, and comprises a hearth, a horizontal flue and a tail shaft flue, a high-temperature superheater is arranged in the horizontal flue, the hearth is provided with combustors, and the combustors are arranged at four corners of the hearth. The combustors are primary air combustors and are provided with four layers, an electric swing plate capable of swinging up and down is arranged in each primary air combustor, a platen superheater is arranged at the top of the hearth and an inlet of the horizontal flue, and the distance L2 between the primary air combustor on the uppermost layer and the platen superheater is larger than or equal to 20 m. The distance L1 between the primary air combustor on the lowermost layer and the inflection point position of the lower portion of the hearth is larger than or equal to 4 m, a middle ignition layer nozzle is arranged between the primary air combustors on the two middle layers, secondary air nozzles are arranged beside the primary air combustors, and soot blowers are arranged in the hearth at intervals.

The utility model discloses an anti-slagging device for a fluidized bed gasification furnace, which relates to the technical field of fluidized bed gasification furnaces and comprises a furnace body and a linkage mechanism, and the linkage mechanism for efficient cleaning is arranged in the middle of the inner side of the furnace body. The linkage mechanism comprises a speed reducing motor, a matching gear, a rotating frame, a rotating sleeve, a supporting frame, scraping plates, a ventilation pipe and an air spraying head, the matching gear is arranged at the output end of the speed reducing motor, the rotating frame is arranged below the matching gear, and scraping plates are fixed to the two sides of the rotating frame. Compared with an existing device, the anti-slagging device of the fluidized bed gasification furnace has the advantages that the surface of the furnace body can be scoured through cooperation of all parts of the linkage mechanism, so that slagging is prevented, dual slag removal treatment can be achieved, and the slag removal effect is guaranteed; and meanwhile, the hard metal scraping plate attached to the surface of the furnace body can better remove slag, so that the problem of adhesion and fastening is solved.

The invention provides a vortex suppression device and method for molten steel in a barrel. Molten steel is injected into the steel drum, the molten steel and the scum are layered in the height direction, and the molten steel can be discharged from the steel outlet; the vortex suppression device for the molten steel in the barrel comprises a floating body, the floating body is provided with a floating body bottom face and a floating body top face which are opposite in the height direction, the floating body is arranged above a steel outlet in the steel barrel and floats between the molten steel and the scum, and the floating body top face is exposed above the scum. The top surface of the floating body is provided with a surface of which the geometric normal vector change is changed into the geometric shape change, so that the heat transfer area of the top surface of the floating body exposed above the scum is increased, the heat dissipation speed is increased, the scum is condensed on the bottom surface of the floating body and the periphery of the floating body more quickly, the area of the floating body in the horizontal direction is increased, and the friction force of the floating body to molten steel is also increased; and the effect of inhibiting vortex generation is improved.

The utility model relates to the technical field of smelting furnace equipment, in particular to an electromagnetic flow guiding device of a cast-rolling smelting furnace. Comprising a cast-rolling double-chamber furnace and a flow guide channel, the cast-rolling double-chamber furnace comprises a first smelting furnace and a second smelting furnace, a conveying mechanism is arranged between the flow guide channel and the first smelting furnace, the conveying mechanism comprises a liquid rising pipe and a first magnetic field generator, and a solution outlet of the first smelting furnace is located in the lower side of the liquid rising pipe; one end of the riser tube communicates with a solution outlet of the first smelting furnace, the other end of the riser tube communicates with a solution inlet of the flow guide channel, the first magnetic field generator is arranged on the side face of the riser tube, and the second magnetic field generator is arranged in the circumferential direction of the flow guide channel. And the second magnetic field generator circumferentially arranged on the flow guide channel drives the metal solution flowing into the inlet of the flow guide channel to pass through the flow guide channel and finally enter the second smelting furnace, so that the slagging phenomenon caused by contact with the metal solution when a mechanical pump provides power is avoided, and the manual workload is reduced.

This utility model relates to the field of refractory materials technology for metallurgical equipment, and in particular to a ladle tank bottom lining structure with a gradient thickness, including ladle nozzle seat bricks, vertically laid tank bottom bricks, and lining wall bricks. The vertically laid tank bottom bricks include center bricks, intermediate bricks, and edge bricks, which are laid in a ring from the ladle nozzle seat bricks towards the edge of the ladle tank bottom, with the thickness d of the center bricks, intermediate bricks, and edge bricks increasing by 30mm to 40mm respectively. The lining wall bricks are set at the bottom of the inner wall of the ladle tank and connect with the edge bricks, with the thickness e of the lining wall bricks decreasing by 15mm to 20mm from bottom to top. The beneficial effects of this utility model are: by optimizing the thickness distribution, it improves thermal shock resistance, structural stability, and service life, and increases the steel loading capacity.

The invention discloses a two-stage series return material device and temperature control method for a circulating fluidized bed boiler, comprising a first-stage return material device and a second-stage return material device connected in series; the second-stage return material device comprises a loosening chamber, a normal return material pipe and a bypass overflow pipe, a heat exchange surface is arranged as required inside the loosening chamber, the loosening chamber is connected to the furnace through the normal return material pipe and the bypass overflow pipe, and the inlet end of the first-stage return material device is connected to a cyclone separator. The device and the temperature control method realize the separation of the combustion process and the heat exchange process of the circulating fluidized bed boiler, fundamentally solve the problems of high-temperature corrosion, ash accumulation, slagging and the like of the heating surface in the furnace when the circulating fluidized bed boiler burns biomass fuel, and help to realize the high parameterization of the biomass fluidized bed boiler. At the same time, the working medium temperature is adjusted by adjusting the normal return material air volume; the bed temperature is adjusted by controlling the bypass return material air volume. In addition, the circulating ash can be returned to the furnace through the bypass overflow pipe, avoiding the emergency shutdown problem caused by the interruption of the circulating ash loop when the normal return material pipe or the heat exchange surface fails.

The present application relates to the metallurgical technology field, especially relate to a kind of off-oven refining combined vacuum arc remelting preparation ultra-pure stainless steel method.The preparation method of the present application is by AOD station to transfer the crude molten steel obtained by EAF smelting to AOD refining furnace to blow oxygen refining, pre-reduction refining slag is CaO-CaF2-SiO2-MgO slag system;After pre-reduction treatment, reduction treatment is carried out, and the reduction refining slag is CaO-CaF2-SiO2-MgO slag system;The molten steel after reduction treatment is transferred to VD furnace for vacuum treatment, and the treated molten steel is transferred to ladle, then poured into mold, and ingot is obtained;After ingot is forged into electrode, ultra-pure stainless steel is prepared by VAR, with ultra-high cleanliness, coarse system inclusions is 0 level, fine system A+B+C+D inclusions≤0.5 level, effectively realize the accurate low control of aluminum content in steel, and simultaneously reduce the oxygen content and non-metallic inclusion content in steel, finally prepare high-quality ultra-pure stainless steel.