876results about "Gas emission reduction" patented technology

A method for producing molten iron in at least one blast furnace (1) comprising at least two levels of gas injection (3A, 3B) and releasing a blast furnace top gas (10) during operation, the method comprising at least the steps of: charging the blast furnace with an iron-containing charge (4) and a first carbon-based reductant (5), injecting at the first level (3A) hot blast (11) having a temperature of at least 1000° C., said hot blast containing oxygen (6), recovering the blast furnace top gas and extracting hydrogen to produce a H2-rich stream (13) containing more than 90%v of hydrogen and a H2-lean stream (12), injecting the H2-rich stream (11) into the blast furnace at the second level (3B) of gas injection. Related network of plants.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method for smelting pure steel through cooperation of electric furnace bottom hydrogen blowing and RH refining combined hydrogen and argon blowing. By means of electric furnace bottom hydrogen blowing, strengthening of molten pool stirring, promotion of mass and heat transfer in an electric furnace molten pool, improvement of production efficiency, promotion of carbon-oxygen reaction in a metal molten pool and reaction between molten metal and slag at the same time; dissolved oxygen in molten steel and FeO in slag are controlled, the nitrogen content in the steel is controlled, and the hydrogen content in the molten steel is increased; and then RH blowing hydrogen and argon mixed gas refining is conducted, nitrogen, copper and tin in the steel are removed, RH decarburization is conducted, after nitrogen removal meets the requirement, RH argon blowing is conducted to achieve dehydrogenation, and nitrogen, copper, tin and inclusions in the steel continue to be removed. Through cooperative application of the electric furnace smelting technology and the RH smelting technology, production of the high-purity molten steel is achieved.

The invention discloses a DCS (Distributed Control System)-based ignition and temperature rise mode of a copper anode slime roasting rotary kiln, which specifically comprises the following steps of: setting initial control conditions, drawing a temperature rise curve according to a target temperature, a temperature rise period and a temperature rise gradient, and then starting ignition preparation. Before natural gas is introduced into the combustion chamber for combustion, rotary kiln operation and combustion-supporting air purging are carried out, after purging is carried out for a period of time, combustion-supporting air and natural gas are introduced for ignition at the same time, and meanwhile the ignition condition is judged through a monitor. And if ignition fails, under the condition of no abnormity, purging can be repeated, and natural gas is introduced for re-ignition. According to the method, the natural gas flow and the combustion-supporting air volume are automatically controlled by the DCS according to the drawn temperature rise curve. The system has the beneficial effects that multiple ignition conditions can be controlled at the same time, remote automatic ignition is achieved, the ignition condition is fed back in time, the natural gas flow is flexibly controlled, the combustion temperature is controlled, the ignition effect of the rotary kiln is guaranteed, and meanwhile production operation safety of the rotary kiln is guaranteed.

The invention relates to the technical field of aluminum melting furnaces, in particular to an aluminum ingot melting device which comprises a gas system and a melting system. The fuel gas system comprises a first gas cylinder, and compressed natural gas is contained in the first gas cylinder. The melting system comprises a melting furnace, the melting furnace is provided with a melting space, and a plurality of first combustion ports are formed in the side wall, corresponding to the melting space, of the melting furnace; when the aluminum ingot melting device works, an aluminum ingot in the melting space is rapidly heated to a first temperature, the aluminum ingot is in an unmelted state when the first temperature is reached, and after the first temperature is reached, unburnt compressed natural gas is directly blown to the aluminum ingot through the first burning port, so that the aluminum ingot is cooled and cracked or an oxide layer is cracked; after cooling for a preset time, heating the aluminum ingot with the cracked surface until the aluminum ingot is molten; according to the method, the aluminum ingot is rapidly heated to the non-molten state, then through rapid cooling and thermal expansion and cold contraction, an oxide layer is cracked or broken, the aluminum ingot is cracked and even broken, and the heating effect is improved through reduction of a subsequent heating oxide film or increase of the contact area.

The invention discloses a natural gas supply device for an industrial furnace, which relates to the technical field of gas supply systems for industrial furnaces, and comprises an annular guide rail which is arranged at the side end of a gas inlet flow regulation and control valve pipe in a sleeving manner and is used for driving an adjusting shaft and an ultrasonic generator to be positioned at the side end of a gas inlet pipeline to carry out ultrasonic frequency emission regulation and control, under the cooperation of the oxygen-containing regulation and control assembly, the oxygen content proportion in the natural gas in the oxygen-containing conveying pipe is rapidly corrected, the precise oxygen content needed by combustion of the industrial furnace is guaranteed, super-uniform mixing of natural gas and oxygen is integrally achieved, the incomplete combustion phenomenon caused by fluctuation of the oxygen content is reduced, and the heating effect and the product quality are improved; and under the cooperation of the ultrasonic adjusting assembly, more complex pipeline impurity conditions can be treated, so that emission parameters and reflection angles of self-adaptive automatic adjustment ultrasonic waves are formed, natural gas conveying is smoother, and therefore the combustion stability and heat efficiency of the industrial furnace are improved.

The invention discloses a test coil heat treatment system and process, and the system comprises a vertical gas furnace which is used for accommodating and heating a test coil; the crucible is arranged in the vertical gas furnace and is used for directly carrying out heat treatment on the test coil; the argon protection control system is connected with the vertical gas furnace and the built-in crucible, provides high-purity argon to replace gas, maintains micro-charging and micro-discharging in the heat treatment process, and controls the temperature in the vertical gas furnace so as to meet the heat treatment of the coil; the argon supply system is used for supplying argon to the vertical gas furnace and the built-in crucible; and the monitoring and control system is used for monitoring and controlling the temperature, the pressure and the flow in the heat treatment process in real time. The temperature control system and the thermocouple are used in cooperation, accurate temperature control over the coil in different stages can be achieved, the heat treatment quality is improved, the argon protection system provides a stable protection atmosphere for the coil through the preheating coil and the flow control valve, oxidation and impurity pollution are effectively prevented, and the corrosion resistance and the electrical performance of the coil are improved.

To reduce carbon dioxide by treating the carbon dioxide in an arc furnace itself, and to provide a carbon dioxide treatment method using a carbon dioxide treatment technique in the arc furnace itself.SOLUTION: An arc furnace for melting metal is used, carbon dioxide-containing gas is introduced into the arc furnace, and the carbon dioxide-containing gas is brought into contact with an arc in the arc furnace to decompose carbon dioxide into oxygen and carbon monoxide. Carbon monoxide and oxygen after decomposition are recovered and reused by a recovery system, and undecomposed carbon dioxide is also recovered by the recovery system and introduced into the arc furnace again to be treated.SELECTED DRAWING: Figure 1

The invention provides a biomass gasification coupling iron ore powder reduction device and method with CO2 circulation, and relates to the technical field of direct reduction of iron from biomass gasification products. The biomass gasification coupling iron ore powder reduction device with CO2 circulation comprises a biomass gasification reaction device and a circulating fluidized bed reduction reaction device. The method comprises a method of a biomass gasification reaction device and a method of a circulating fluidized bed reduction reaction device. Through structural arrangement and application of the biomass gasification reaction device and the circulating fluidized bed reduction reaction device, CO2 gas circulation, zero carbon emission and high-purity iron raw material efficient utilization preparation can be achieved; the preparation method is simple and easy to operate, green and environment-friendly, low in cost, short in process, high in efficiency and beneficial to industrial large-scale production and popularization.

High temperature furnaces, calcining, pyrolysis and other high temperature manufacturing processes, composition rearrangements, and equipment. Systems, equipment and processes using oxyfuel combustion using gaseous fuels for cement manufacture. Reactor furnaces using oxyfuel containing natural gas and gravity feed to process pellets forming a pellet bed into cement.

The present disclosure provides a system and a method for steel synthesis using green hydrogen by coupling renewable energy and Carnot batteries with Solid-Oxide Electrolyser Cells (SOEC) and carbon capture. The system provides an end-to-end, geography-agnostic solution for steel synthesis with green hydrogen with round-the-clock renewable energy using Carnot battery that provides both heat and power to run an SOEC at a high efficiency. The hydrogen from the SOEC may be used for direct reduction of iron followed by steel synthesis in an Electric Arc Furnace. The heat from the SOEC is also used for capturing CO2 from the exhaust gases (or air in the DAC configuration). The captured CO2 may be used for electrofuels synthesis along with green hydrogen or electrochemically reduced to carbon. The process heat from DRI and EAF is recycled back to the Carnot batteries.

Reduction reactor and process of effecting reduction of iron ore material to reduced iron material. The process includes feeding iron ore material into a reduction reactor at a top portion thereof, creating a gravitational flow of the material in the reduction reactor from the top portion, axially downwards towards a bottom portion of the reduction reactor; feeding a heated reduction gas into the reduction reactor at the top portion of the reduction reactor, such that the reduction gas creates a co-current flow with the gravitational flow of the material in the reduction reactor; and by means of the reduction gas reducing the iron ore material to reduced iron material in the reduction reactor.

This invention provides processes and systems for converting biomass into high-carbon biogenic reagents that are suitable for a variety of commercial applications. Some embodiments employ pyrolysis in the presence of an inert gas to generate hot pyrolyzed solids, condensable vapors, and non-condensable gases, followed by separation of vapors and gases, and cooling of the hot pyrolyzed solids in the presence of the inert gas. Additives may be introduced during processing or combined with the reagent, or both. The biogenic reagent may include at least 70 wt %, 80 wt %, 90 wt %, 95 wt %, or more total carbon on a dry basis. The biogenic reagent may have an energy content of at least 12,000 Btu / lb, 13,000 Btu / lb, 14,000 Btu / lb, or 14,500 Btu / lb on a dry basis. The biogenic reagent may be formed into fine powders, or structural objects. The structural objects may have a structure and / or strength that derive from the feedstock, heat rate, and additives.

The utility model relates to the technical field of industrial heating furnaces, in particular to a natural gas continuous type annular forging heating furnace which comprises a furnace body and a rotary furnace bottom located in the furnace body, the interior of the furnace body is divided into a preheating area, a heating area and a heat preservation area, and the rotary furnace bottom is driven by a speed reducer to rotate in the circumferential direction. A smoke outlet and a plurality of combustors are arranged in the furnace body, the combustors are arranged at the tops of the heating area and the heat preservation area in the furnace body, the smoke outlet is formed in the top of the preheating area in the furnace body, and the smoke outlet is externally connected with a negative pressure fan; a plurality of supporting pipes are evenly distributed and fixed to the outer wall of the furnace body in the circumferential direction, a circle of heat preservation skin is fixed to an outer ring formed by the multiple supporting pipes, and the space between the heat preservation skin and the outer wall of the furnace body is filled with heat preservation cotton. The heating furnace can effectively improve the energy utilization efficiency, reduce the energy cost consumption, ensure the stable forging temperature in the furnace, and can form an automatic production line with the previous and later procedures to improve the machining efficiency.

The invention discloses a layered, zoned and differentiated CO2 injection system and method for a blast furnace, and belongs to the technical field of ferrous metallurgy low carbon. The system comprises a CO2 supply and distribution system, a tuyere area injection module, a furnace body middle-lower part injection module and a furnace body upper part injection module. And according to the temperature gradient and atmosphere layering characteristics in the blast furnace, a differential CO2 distribution proportion and a collaborative thermal compensation strategy are adopted. An oxygen-CH4 synergistic injection device is arranged in a tuyere area, and rapid conversion of CO2 is promoted by using a high-temperature strong reducing atmosphere; a biomass charcoal synergistic injection device and an angle-adjustable nozzle are arranged at the middle lower part of the furnace body, so that efficient gasification reaction is realized; and low-concentration CO2 mixed injection is adopted at the upper part of the furnace body, so that indirect reduction reaction is promoted. According to the invention, the CO2 conversion rate is 65-80%, the coke ratio is reduced by 15-25%, the consumption of CO2 per ton of iron is 260-90Nm < 3 >, the carbon emission is obviously reduced, and the ironmaking efficiency is improved.

This invention provides processes and systems for converting biomass into high-carbon biogenic reagents that are suitable for a variety of commercial applications. Some embodiments employ pyrolysis in the presence of an inert gas to generate hot pyrolyzed solids, condensable vapors, and non-condensable gases, followed by separation of vapors and gases, and cooling of the hot pyrolyzed solids in the presence of the inert gas. Additives may be introduced during processing or combined with the reagent, or both. The biogenic reagent may include at least 70 wt %, 80 wt %, 90 wt %, 95 wt %, or more total carbon on a dry basis. The biogenic reagent may have an energy content of at least 12,000 Btu / lb, 13,000 Btu / lb, 14,000 Btu / lb, or 14,500 Btu / lb on a dry basis. The biogenic reagent may be formed into fine powders, or structural objects. The structural objects may have a structure and / or strength that derive from the feedstock, heat rate, and additives.

The present invention relates to reduction of a metal oxide material (5) and to a metal material production configuration (1) adapted for reduction of a metal oxide material (5) holding thermal energy into a reduced metal material (16).The metal oxide material (5) is charged into an upper interior portion (UP) of a reduction facility (7). A hydrogen containing reducing agent (6) is introduced into the reduction facility (7) and is adapted to react with the metal oxide material (5) holding thermal energy for reducing the metal oxide material (5) by utilizing the thermal energy of the metal oxide material (5) to heat or further heat the introduced hydrogen containing reducing agent (6).The reduction facility (7) of the metal material production configuration (1) is configured for providing a heat treatment process of the reduced metal material (16).A control circuitry (50) is configured to adjust the temperature of the hydrogen containing reducing agent (6) and control the temperature of the introduced hydrogen containing reducing agent (6) for reaching at least one desired passivation parameter value (DPPV) of the reduced metal material (16).

The equipment comprises a heating furnace, an opening is formed in one side of the heating furnace, a die forging furnace is arranged in front of the opening at intervals, transmission chains extending to the two sides of the die forging furnace are arranged on the two sides of the opening of the heating furnace, and pipe body deformation restraining pipes are arranged on the portions, located above the two transmission chains, of the two sides of the die forging furnace correspondingly. The two pipe body deformation restraining pipes are coaxially arranged, the ends, away from the die forging furnace, of the two pipe body deformation restraining pipes are connected with a stopping base and a power base respectively, and one side of the stopping base is coaxially connected with an easily-drilled metal rod stretching into an inner hole of a drill pipe body in the die forging furnace through a connecting rod. Compared with an existing drill rod with an anti-abrasion sleeve additionally arranged in the middle of a pipe body, the drill rod is safer and more reliable in use, and the service life of the pipe body of the drill rod is prolonged; meanwhile, compared with a drill rod with a thickened middle formed by turning a thick-wall round pipe, a large number of steel material resources can be saved, the production cost is reduced, and the production efficiency is improved.

The present disclosure relates to systems and methods for the production of molten metals direct oxidative combustion of one or more solid fuels. The systems and methods may be combined with coal gasifiers and related components for reducing overall energy requirements as well as external fuel sources, e.g., through the use of endogenously-generated hydrogen. In beneficial aspects, components of the carbonaceous exhaust produced in accordance with the disclosed systems and methods, such as carbon dioxide (CO2), may be isolated using carbon capture and sequestration (CCS) for reducing associated greenhouse gas emissions.

This invention provides processes and systems for converting biomass into high-carbon biogenic reagents that are suitable for a variety of commercial applications. Some embodiments employ pyrolysis in the presence of an inert gas to generate hot pyrolyzed solids, condensable vapors, and non-condensable gases, followed by separation of vapors and gases, and cooling of the hot pyrolyzed solids in the presence of the inert gas. Additives may be introduced during processing or combined with the reagent, or both. The biogenic reagent may include at least 70 wt %, 80 wt %, 90 wt %, 95 wt %, or more total carbon on a dry basis. The biogenic reagent may have an energy content of at least 12,000 Btu / lb, 13,000 Btu / lb, 14,000 Btu / lb, or 14,500 Btu / lb on a dry basis. The biogenic reagent may be formed into fine powders, or structural objects. The structural objects may have a structure and / or strength that derive from the feedstock, heat rate, and additives.

An ironmaking method comprising the production of hot metal (2) and of a blast furnace top gas (10), the method comprising the steps of capturing at least a part of the top gas (10), separating CO2 from the captured top gas (10) so as to produce a CO2-rich stream (12) and a CO2-lean stream (11), mixing the CO2-rich stream (12) with a H2 makeup stream (30) and subjecting the obtained CO2 / H2 gas mixture to a reverse water gas shift reaction in a reactor (3) to produce a reducing stream (13) comprising CO and H2, separating H2 from the reducing stream to produce a CO- rich stream (14) and an H2-rich stream (15), mixing the H2-rich stream (15) with the CO2-rich stream (12) or with the CO2 / H2 gas mixture in the reactor (3) and subjecting the obtained gas mixture to the reverse water gas shift reaction and feeding at least a portion of the CO-rich stream 14 (13) to at least one chemical or biochemical plant (4) to produce one or more chemical products (16).

An injection regulation and control device includes blast furnace tuyeres for introducing rich oxygen or pure oxygen to form tuyere raceways. Temperature-adjusting injection openings are evenly formed in the circumferential direction of a blast furnace and inject a hydrocarbon component-containing injection object to the blast furnace. The temperature-adjusting injection openings are located, in an axial direction, within a height range where a soft melting dripping zone is located and are not lower than the positions of the blast furnace tuyeres. The hydrocarbon component-containing injection objects are enabled to undergo a thermal cracking reaction by utilizing the temperature in the vicinity of the tuyere raceways to form a hydrocarbon thermal cracking heat absorption area. Gas products generated by the thermal cracking reaction of the hydrocarbon component-containing injection objects increase the blast furnace gas volume. Redundant heat in a lower high-temperature area is carried to the upper part of the blast furnace.

This invention provides processes and systems for converting biomass into high-carbon biogenic reagents that are suitable for a variety of commercial applications. Some embodiments employ pyrolysis in the presence of an inert gas to generate hot pyrolyzed solids, condensable vapors, and non-condensable gases, followed by separation of vapors and gases, and cooling of the hot pyrolyzed solids in the presence of the inert gas. Additives may be introduced during processing or combined with the reagent, or both. The biogenic reagent may include at least 70 wt %, 80 wt %, 90 wt %, 95 wt %, or more total carbon on a dry basis. The biogenic reagent may have an energy content of at least 12,000 Btu / lb, 13,000 Btu / lb, 14,000 Btu / lb, or 14,500 Btu / lb on a dry basis. The biogenic reagent may be formed into fine powders, or structural objects. The structural objects may have a structure and / or strength that derive from the feedstock, heat rate, and additives.

The invention discloses a CO2-mediated indirect hydrogen metallurgy blast furnace smelting process, and belongs to the technical field of low-carbon metallurgy and hydrogen metallurgy. According to the process, on the premise that the main body structure of a blast furnace is not changed, CO2 in furnace top gas is captured and mixed with external H2, a reverse water-gas shift reaction is carried out in a high-temperature and high-pressure environment outside the furnace, and high-temperature CO reducing gas is generated; and then directly injecting the high-temperature reducing gas into a soft melting zone area of a blast furnace body by utilizing a special device. According to the method, a central coke adding and distributing mode and a quick response coal injection strategy are matched, and part of pulverized coal and coke can be effectively replaced; by constructing a heat transfer mechanism of heat absorption conversion outside the furnace and heat release reduction inside the furnace, the heat absorption reaction is transferred to the outside of the furnace to be completed, meanwhile, high-temperature gas injected into the furnace body is used for directly supplementing heat in the furnace and strengthening indirect reduction reaction, and cyclic utilization of CO2 is achieved.

A steel manufacturing method includes the steps of producing direct reduced iron in a direct reduction plant (1) using a syngas (70) resulting from the gasification of solid waste fuels, producing hot metal (22) and a blast furnace top gas (21) in a blast furnace (2) using a hot blast (20), the blast furnace top gas (21) being at least partly (21A) used into the direct reduction plant (1) and producing molten metal and electric furnace gas in an electric furnace (3) using the produced direct reduced iron (12). Associated network of plants.

A zero-carbon flash reduction ironmaking device comprises a reaction tower, the reaction tower is arranged upside down, a flash reduction area, an iron powder waste heat boiler and a green oxygen preheater are sequentially arranged in an inner cavity of the tower from top to bottom, oxyhydrogen powder entering the tower is subjected to oxyhydrogen combustion, mineral powder green hydrogen absorbs heat and is heated to the high temperature, and all hydrogen reduction reaction is completed before the mineral powder flows out of the flash reduction area. Iron powder is cooled through an iron powder waste heat boiler and a green oxygen preheater, hydrogen steam is cooled through a hydrogen steam waste heat boiler and a mineral powder preheater, and hydrogen water is separated through a cyclone dehydrator and a drying filter. The iron ore concentrate powder with the particle size smaller than 200 meshes falls into a powder bin, the reduction temperature ranges from 1100 DEG C to 1200 DEG C, the time for the ore powder to flow through a flash reduction area ranges from 2 s to 3 s, and the temperature for the ore powder to leave an iron powder waste heat boiler and the temperature for hydrogen steam to leave a hydrogen steam waste heat boiler range from 125 DEG C to 175 DEG C. The invention can be used for flash smelting of iron ore concentrate powder. The invention has the advantages of high waste heat recovery rate, long service life of the furnace lining, low energy consumption and zero carbon emission, and can avoid using the key management object coke ironmaking blast furnace device of the national two-high project.

The utility model discloses a refractory material production performance testing device which comprises a box body, a box door hinged to the front side of the box body through a hinge, supporting frames fixedly connected to the front side and the rear side of the bottom of the box body, an exhaust pipe arranged on the right side of the box body, a fan fixedly connected to the left side of the box body, and a detection mechanism arranged in the box body. And a fixing mechanism is arranged in the box body. According to the utility model, the detection mechanism and the fixing mechanism are used, so that the cylindrical refractory material can be subjected to extrusion and high-temperature testing, and the problem that when the refractory material is tested, various different testing devices, such as a high-temperature testing device, a pressure-resistant testing device and the like, need to be used for comprehensively evaluating the performance of the refractory material is solved; therefore, the refractory material testing cost is increased, the refractory material testing time is prolonged, the refractory material testing efficiency is reduced, and the device has the advantage of being convenient to detect.

The invention discloses an efficient natural gas smelting furnace matched pipe joint device with a self-sealing function, and relates to the technical field of natural gas pipe joints. An efficient natural gas smelter matched pipe joint device with a self-sealing function comprises an L-shaped main pipe, a buffer sealing pipe fixedly installed in the main pipe, and a self-sealing pipe, the two ends of the main pipe are connected with a fuel gas pipeline and a smelter pipeline through two sets of connecting flanges respectively, and the buffer sealing pipe is fixedly installed in the main pipe. Pressure fluctuation is formed through the gradual change hole structure, the buffering sealing pipe is expanded through the high-pressure section, the pressing force between the buffering sealing pipe and the inner wall of the main pipe is enhanced, the self-sealing effect is improved while the self-sealing device adapts to the pressure fluctuation or vibration working condition, and the leakage risk is reduced; local resistance is further reduced through the arc-shaped expansion holes, the conveying efficiency is improved, the piston mechanism is driven through natural gas pressure changes, impurities are alternately collected and discharged through valve element switching, and external energy is not needed.

A method for producing direct reduced iron with increased carbon content, comprising: providing a carbon monoxide-rich gas stream and dividing the carbon monoxide-rich gas stream into at least two separate carbon monoxide-rich gas streams; providing a hydrocarbon-rich gas stream and dividing the hydrocarbon-rich gas stream into at least two separate hydrocarbon-rich gas streams; blending one of the carbon monoxide-rich gas streams with one of the hydrocarbon-rich gas streams to form a mixed carburizing gas stream; blending another of the at least two separate carbon monoxide-rich gas streams with another of the at least two separate hydrocarbon-rich gas streams to form a different mixed carburizing gas stream; conveying each of the mixed carburizing gas streams with different compositions to a transition zone of a direct reduction furnace, and exposing partially or fully reduced iron oxides to the mixed carburizing gas streams to increase the carbon content of the resulting direct reduced iron to greater than 4.5 weight percent.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a multifunctional efficient rotary stirring powder spraying desulfurization injection method, which is characterized in that carbon powder is added into injection powder, so that the fluidity of desulfurization powder is improved, the risk of blocking a powder channel in the powder injection process is reduced, molten iron is recarburized, the chemical latent heat of the molten iron is improved, and the desulfurization effect is improved. The activity coefficient of sulfur in the molten iron is increased, and desulfurization is promoted; on the other hand, hydrogen-rich gas such as hydrogen or natural gas or coke oven gas is adopted to replace nitrogen and argon to serve as carrier gas for injection, the injected gas reacts with oxygen in the molten iron, oxygen in the molten iron is reduced, desulfurization is promoted, and loss caused by the reaction of magnesium powder and oxygen in the molten iron is reduced; meanwhile, the blown-in gas directly reacts with sulfur in the molten iron, and the desulfurization effect is achieved.

The present invention relates to the technical field of energy-saving roasting of coated sand, and discloses a regenerative coated sand roasting furnace, comprising a main body, a combustion chamber is arranged in the main body, an igniter facing the combustion chamber is installed on the main body, and a feed chamber is fixed on one side of the main body, one side of the combustion chamber is connected to the feed chamber, and the side of the combustion chamber away from the feed chamber is connected to a preheating bag, and the preheating bag is connected to an exhaust pipe; a baffle is arranged in the feed chamber, and a preheating chamber connected to the exhaust pipe is opened in the side wall of the feed chamber; the preheating chamber is connected to the exhaust pipe. The present invention has a simple structure, and the waste gas discharged from the combustion chamber is sent into the feed chamber to preheat the sand particles. The sand particles with a certain temperature enter the combustion chamber, which can reduce the heat consumption in the combustion chamber, thereby reducing the use of natural gas and reducing the roasting cost of the sand particles.