845results about "Blast furnace components" patented technology

The invention relates to a modified chrome corundum ramming material and a preparation and construction process thereof, and belongs to the technical field of chrome corundum ramming materials. The ramming material comprises a material A, a material B and a material C, wherein the material A comprises chrome corundum aggregate, titanium dioxide coated aluminum oxide microspheres, calcium sulfide dehydrate and silicon carbide porous microspheres; the material B comprises chromium oxide-zirconium oxide composite nano powder, sodium thiosulfate pentahydrate, tricalcium phosphate and hexagonal boron nitride flaky crystals; and the material C comprises an aluminum dihydrogen phosphate-magnesium hydroxide compound, a calcium fluoride-aluminum oxide co-melt and a silane coupling agent. The preparation process comprises the steps of pretreatment of all the components, preparation of composite powder and layered preparation. The construction process comprises the steps of pretreatment, wet-process mixing, layered ramming, negative-pressure permeation, medium-temperature reaction, spraying curing, integral firing and the like. Generation of hexavalent chromium can be effectively inhibited, the thermal shock resistance, the mechanical strength and the heat-conducting property of the material are remarkably improved, and the material has the advantages of being good in environment friendliness, long in service life, excellent in construction performance and the like.

The invention provides a blast furnace coal injection control method and equipment and a readable storage medium, and relates to the technical field of blast furnace ironmaking. According to the method, the influence of the pulverized coal property change of the injected pulverized coal on the coal injection operation can be deeply considered, and the updated conversion model of each coal injection regulation and control device can represent the comprehensive influence of the pulverized coal property change on the parameter conversion relationship between the device control quantity and the coal injection rate through adaptive updating of the model parameters; and meanwhile, a coal injection regulation and control device combination matched with the real-time coal injection rate difference distribution condition is selected to execute device working state self-adaptive regulation and control operation based on the updated conversion model, so that through organic combination of a multi-model decoupling control mode and a coal injection rate indirect regulation mode, coal injection rate regulation and control fluctuation is effectively reduced, and the coal injection rate regulation and control efficiency is improved. And it is ensured that the coal injection rate is stably and uniformly maintained at a set rate value, so that the blast furnace steady-state coal injection effect is achieved, and the blast furnace ironmaking production operation meets the requirements of blast furnace production improvement, energy consumption reduction, pollution reduction and the like.

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 relates to the technical field of blast furnace ironmaking, and discloses a blast furnace temperature targeted adjusting method and system based on a big data platform, and the method comprises the following steps: obtaining multiple groups of historical data in a blast furnace; training a preset neural network model by using the plurality of groups of historical data to obtain a furnace temperature prediction model; acquiring real-time measurement data of a plurality of preset parts of the blast furnace, and utilizing the furnace temperature prediction model to obtain a furnace temperature prediction value of each preset part; and the coal injection amount of each tuyere is adjusted according to the furnace temperature predicted value of each preset part, and targeted adjustment of the furnace temperature is achieved. According to the method, detailed historical data is acquired and analyzed, the furnace temperature prediction model is trained based on the historical data to realize furnace temperature prediction of each preset part of the cooling wall of the blast furnace, targeted adjustment of the furnace temperature is realized according to the prediction result, and the functions of revealing internal temperature distribution of the blast furnace, furnace temperature prediction and closed-loop adjustment are simply and efficiently realized.

A cleaning device suitable for a blast furnace top blow-off valve port comprises a lifting part, a rotating part, a rotating part and a scraping and sweeping part. The lifting part is arranged on a blast furnace top platform and located on one side of the blow-off valve. The rotating part is arranged on the lifting part; the rotating part is arranged on the rotating part; and the scraping and sweeping part is arranged on the rotating part. The blow-off valve opening cleaning device improves the blow-off valve opening cleaning efficiency and reduces the labor intensity of workers.

A slag barrier plate for a side-blown melting furnace with a melting bath, characterized in that it comprises: a slag barrier unit (1) with a plate body (11) for holding back molten slag; a heat dissipation unit (2) comprising: a cooling water jacket (21) extending through the interior of the plate body (11) to continuously introduce cooling medium into the plate body (11) to lower its temperature; a distributor arrangement (22) arranged at the end of the cooling water jacket (21) to introduce the cooling medium into the cooling water jacket (21).

The invention provides a large blast furnace overhaul body construction method which comprises the following steps: after cleaning in a furnace is completed, mounting a protective shed and a protective shed central upright post; removing the last layer of carbon bricks by using an annular hoisting system of the protective shed, recovering to hoist and build the hearth carbon bricks and the tuyere combined bricks, and constructing by using the protective shed as a construction platform; the hanging scaffold is lowered to the position above the protective shed; the protective shed is dismantled; refractory spraying construction is conducted on the protective shed area, and the interior of the furnace is cleaned; baking the furnace; and dismantling the oven facility. According to the invention, the requirements of construction operations such as remaining of four layers of carbon bricks at the bottom of the furnace, removal and recovery of all of the rest carbon bricks and tuyere combined bricks, partial replacement of the cooling wall, patching of the furnace shell, lining making on the surface of the cooling wall, steel brick repair and gas sealing cover repair are met; according to the method, the construction period is effectively shortened, and the operation safety of the hearth and the masonry quality of refractory materials are effectively guaranteed.

The invention relates to a manipulator arm (12) for being connected to a manipulator chassis frame (11) disposed in particular in the periphery of a metallurgical smelting furnace, the manipulator arm (12) having a proximal end (35) for being connected to the manipulator chassis frame (11) and a distal end (16, 41) equipped with a first tool receptacle (17) and serving to be connected to a shovel (20, 43). The manipulator arm (12) has a second tool receptacle at its distal end (16, 41), the second tool receptacle being formed irrespective of the first tool receptacle (17) and being intended to be connected to a hammer mill (29) or a drilling machine

The utility model discloses a quick cleaning and purging device for an iron notch mud sleeve, which relates to the technical field of metallurgical equipment and comprises a scraping structure, a connecting rod structure, a butt joint structure, a connecting structure and an air inlet structure. The scraping structure comprises a connecting sleeve, a first threaded hole, a scraping plate, a drill bit and an exhaust hole, the threaded hole is formed in one side of the connecting sleeve and used for being in butt joint with the connecting rod body, the drill bit is fixed to the other side of the connecting sleeve and used for finding the iron notch center and fixing the scraping plate, and the exhaust hole is used for blowing and cleaning residues. The connecting rod structure is connected with the connecting structure through the butt joint structure, and the connecting structure is connected with the air inlet structure assisting in air inlet and water inlet. The air inlet structure comprises an air guide ring, an oil seal ring and an electromagnetic valve, and compressed air is connected to be matched with the butt joint structure to assist in cleaning iron notch residues and residues of the whole rod body. The device is simple and stable in structure, assists cleaning through compressed air, and has the advantages of simplicity in operation, rapidness and high efficiency.

The utility model discloses a numerical control oxygen lance for blowing in an iron-making blast furnace, which comprises a tubular lance body, and the tubular lance body comprises a lance body front section and a lance body rear section; wherein the gun body front section is used for being inserted into a blast furnace tap hole and stretching into a blast furnace hearth, and the gun body rear section is located outside the tap hole; an air inlet connector is formed in the rear section of the gun body; the rear section of the tubular gun body is provided with a connecting plate, the front end of the connecting plate blocks the rear section of the tubular gun body, and the rear end of the connecting plate is provided with a connector; wherein the tubular gun body is used for conveying mixed gas introduced from the gas inlet connector into a blast furnace hearth from the front section of the gun body; the blast furnace taphole is provided with the hole, and the tubular gun body extends into the hole, so that a sufficient gas source can be directly provided for the combustion of coke at the bottom of the blast furnace, the sufficient combustion of the coke is ensured, and the temperature of the blast furnace is quickly increased.

Provided is a cycle-type reduction system capable of efficiently recycling, as a reducing gas, a CO-rich gas obtained by reforming a CO2-containing exhaust gas generated from a reduction furnace. In this circulation-type reduction system (100), exhaust gas containing CO2 generated in a reduction furnace (10) is recovered via a first line (81), and hydrogen gas is added to the exhaust gas from a hydrogen gas supply device (30) to produce hydrogenated gas. In the catalyst device (40), CO2 in the hydrogenated gas is converted to CO by a reverse water-gas shift reaction, and a CO-rich gas having an increased CO concentration is obtained. The CO-rich gas is supplied to the inside of the reduction furnace (10) as a reducing gas via a second line (82). A separation device for separating, recovering, or removing a specific gas component other than water vapor from the gas passing through the inside is not disposed in the middle of the first conduit (81) and the second conduit (82).

The utility model relates to the technical field of coal injection guns, and mainly discloses a blast furnace coal injection gun which comprises a first feeding pipe, a second feeding pipe, an air inlet pipe, a first valve and a second valve, the outer wall of one end of the first feeding pipe is sleeved with the second feeding pipe in a sliding mode, and the other end of the first feeding pipe is vertically communicated with the air inlet pipe. The surface of one end of the first feeding pipe is sleeved with the air inlet pipe in a sliding mode, a first valve is arranged on the air inlet pipe, a second valve is arranged at the other end of the first feeding pipe, an air cylinder is arranged on the air inlet pipe, and an ejector rod of the air cylinder is connected with the second feeding pipe. The length of the whole equipment can be freely and automatically adjusted through the air cylinder according to needs, then pulverized coal is conveyed to a target area in a blast furnace, the pulverized coal conveying accuracy of the equipment is improved, and waste of pulverized coal raw materials is avoided; and a plurality of water storage grooves are formed in the pipe wall of the second feeding pipe and communicate with the water tank through switching blocks, cooling liquid is pumped into the water storage grooves through the water tank, the temperature of the second feeding pipe is absorbed, the second feeding pipe is prevented from being heated and deformed, and the service life of the equipment is prolonged.

The application discloses a movable furnace hearth with an accelerated heating function and belongs to the technical field of a blast furnace hearth. The movable furnace hearth comprises a furnace hearth body, a moving base, a movable wheel with adjustable start and stop, a ventilation seat, a height-adjustable heating and cleaning integrated assembly, a multi-section hollow pipeline, a winding mechanism and a hammering, piercing and fire spraying integrated assembly. The moving base is fixedly arranged at the bottom of the furnace hearth body. The movable wheel with adjustable start and stop is fixedly installed on the outer side of the moving base in a ring array distribution mode. The ventilation seat is welded on the outer wall of one side of the bottom of the furnace hearth body. The multi-section hollow pipeline is fixedly installed at the center position of the bottom of the inner cavity of the furnace hearth body. The height-adjustable heating and cleaning integrated assembly is fixedly installed on the top of the multi-section hollow pipeline. The winding mechanism is arranged on the top of the height-adjustable heating and cleaning integrated assembly. The application has the advantages of convenience in movement, uniform heating effect, fast heating speed, convenience in internal impurity crushing and cleaning and suitability for promotion and use.

The utility model provides a slag blocking device used in front of a blast furnace, which comprises a slag blocking plate provided with a gap or a hole, and the slag blocking plate is arranged in a main channel and used for blocking large blocks of slag; and the connecting part is arranged at the top of the slag baffle, and a connecting hole is formed in the connecting part. The slag baffle comprises a middle rib and side ribs, the side ribs are arranged on the outermost side of the slag baffle, the middle rib is arranged in the middle of the side ribs, and gaps are formed between the side ribs and the middle rib. According to the slag stopping device used in front of the blast furnace, large slag blocks are stopped in the main runner through the slag stopping plate so that the large slag blocks can make full contact with molten iron, the large slag blocks have sufficient time to be melted before entering the slag runner so that the size can be reduced, accidents can be reduced, and production can be conducted smoothly.

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.

The utility model discloses a system for prolonging the service life of blades of a blast furnace gas excess pressure turbine, which belongs to the technical field of blast furnace equipment and comprises a blast furnace, the blast furnace is connected with a dust removal system through a gas pipeline, the dust removal system is connected with a gas inlet of a gas heating device through the gas pipeline, and a gas outlet of the gas heating device is connected with a TRT or BPRT unit through the gas pipeline. The coal gas heating device is connected into the circulating hydrothermal system through a hydrothermal pipeline, and the circulating hydrothermal system further comprises an intermediate water circulating pump and a flue gas cooler. The smoke heat of the hot blast stove is utilized through the circulating hydrothermal system, so that the consumption of an energy medium is reduced; the temperature of inlet gas of the TRT or BPRT unit is increased through the circulating hydrothermal system, so that the problem of corrosion of turbine blades is solved, and the service life of the blades is greatly prolonged; the salt accumulation problem of the TRT or BPRT turbine blade is solved, the scale inhibitor is reduced or omitted, and the operation cost is saved.

The invention relates to the field of iron and steel metallurgy blast furnace ironmaking, in particular to a method for activating a hearth through blast furnace operation, which comprises the following steps of: establishing a reasonable lower air supply system and an upper charging system, balancing edge and middle airflow distribution, stabilizing a heat system and a slagging system, implementing low-silicon smelting, improving stokehole operation and the like. The temperature of the furnace bottom and the temperature of each layer of the side wall of the hearth are stable, uniform and controllable. A blast furnace operator operates the blast furnace by implementing the technology, the effect of activating the hearth can be achieved, long-term stable and smooth operation of the furnace condition is promoted, and safe, economical, efficient and long-life production of the blast furnace with the stable upper part and the active hearth is achieved.

The blast furnace front oxygen enrichment system comprises a low-pressure oxygen pipeline laid between an oxygen station and an iron making plant, the low-pressure oxygen pipeline is connected with a blast furnace blower through an oxygen branch pipe, an air outlet of the blast furnace blower is communicated with an air inlet of a blast furnace, and the oxygen branch pipe is provided with a flame arrester and a second manual stop valve. A security nitrogen pipe is connected between the flame arrester and the second manual cut-off valve, and a stop valve, a nitrogen buffer tank and a nitrogen quick cut-off valve are sequentially arranged on the security nitrogen pipe in the airflow direction; the oxygen analyzer monitors the oxygen content in the oxygen branch pipe in real time and transmits a monitored value to the PLC, the PLC judges whether the oxygen enrichment rate of a preset instruction is reached or not, and the flow regulating valve is regulated through the PLC; the system is simple in structure, reasonable in design, convenient to implement, capable of being effectively applied to blast furnace smelting, capable of saving electric energy and production cost, good in using effect and convenient to popularize and use.

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).

The invention relates to a blast furnace wall bonding treatment method which comprises the following steps: S1, controlling the charging proportion of high-zinc furnace charge, discharging zinc by utilizing central airflow, and reducing the gathering of zinc in the furnace; s2, the air temperature and the oxygen enrichment rate are increased, so that the theoretical combustion temperature in the furnace is increased, the combustion rate of pulverized coal is increased, the yield of the blast furnace is increased, fuel consumption is reduced, and the retention time of the zinc element in the blast furnace is shortened; s3, increasing the operation pressure difference; on the basis of high pressure difference, full-wind operation is carried out, and a high wind speed is kept, so that enough central airflow can be ensured in the blast furnace; s4, the furnace temperature and the air inlet speed are increased; the blast furnace wall body stickers are severely scoured by the airflow, so that the stickers rapidly fall off; and S5, wall body temperature monitoring. The problems of wall bonding, nodulation and the like in the long-term operation process of the blast furnace can be effectively solved, so that the operation efficiency of the blast furnace is improved, and the service life is prolonged.

Disclosed in the present invention are a steel smelting system and method based on hydrogen-rich reducing gas injection. The steel smelting system comprises a blast furnace and a hydrogen-rich reducing gas pre-production furnace; hydrogen-rich reducing gas from the hydrogen-rich reducing gas pre-production furnace and pure hydrogen are injected into the blast furnace; generated blast furnace top gas is directed into the hydrogen-rich reducing gas pre-production furnace for decarburization; the hydrogen-rich reducing gas pre-production furnace contains nut coke, biomass particles and waste plastic particles; additionally, dry coal powder and pure oxygen are also injected into the hydrogen-rich reducing gas pre-production furnace to prepare hydrogen-rich reducing gas.

The invention belongs to the technical field of decarburization systems, and particularly discloses a hydrogen-rich carbon circulating oxygen blast furnace decarburization system temperature and pressure optimization system and a method thereof.The hydrogen-rich carbon circulating oxygen blast furnace decarburization system temperature and pressure optimization system comprises a negative pressure flash tank and a regeneration tower, the bottom of the regeneration tower is communicated with a first semi-barren liquor pipe and a second semi-barren liquor pipe, and the first semi-barren liquor pipe is communicated with the middle section of an absorption tower; the second semi-barren liquor pipe is communicated with the top end of the negative pressure flash tank, the bottom of the negative pressure flash tank is communicated with a barren liquor pipe, the barren liquor pipe is communicated with the top end of the absorption tower, and a second cooler is arranged on the barren liquor pipe; during use, a part of generated semi-barren liquor enters the absorption tower, the other part of the generated semi-barren liquor enters the negative pressure flash tank, the barren liquor subjected to depressurization flash fully releases carbon dioxide, the temperature is reduced, and the amine liquor circulation volume in the decarbonization device can be reduced, so that the energy consumption is reduced, and the problems that the amine liquor circulation volume in a large decarbonization device is increased and the energy consumption is reduced are solved. And the scale of the corresponding cooling device is larger, so that the energy consumption is increased.

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.

The invention relates to a blast furnace coal injection optimization control method based on injection speed comparison and a blast furnace coal injection system, which are characterized in that based on blast furnace coal injection process requirements, logic design is carried out on remote automatic coal injection control requirements, and the opening degrees of a fluidizing valve and a gulp valve are automatically adjusted, so that the coal injection quantity required by a uniform injection blast furnace is met; the pulverized coal combustion rate and the molten iron quality are improved. A centralized control function picture is developed, a one-key input automation mode is achieved, and meanwhile the actual coal injection amount is monitored in real time. The blast furnace coal injection system is additionally provided with a safety early warning mechanism, alarm reminding is carried out when the air supply flow and the tank pressure exceed an early warning line, and the system safety is greatly improved.

The invention relates to the technical field of adsorption, in particular to a device and process for coupling pressure swing adsorption carbon capture and gas combustion waste heat utilization, the device comprises a temperature swing adsorption pretreatment unit and a pressure swing adsorption unit, the temperature swing adsorption pretreatment unit is used for adsorbing and removing impurity components in blast furnace gas, and the pressure swing adsorption unit is used for adsorbing and removing the impurity components in the blast furnace gas; then, high-purity CO2 product gas is obtained through a pressure swing adsorption unit; the residual decarbonized coal gas adsorbed by the pressure swing adsorption unit is converted into high-temperature flue gas, and then the high-temperature flue gas enters the temperature swing adsorption pretreatment unit again for heat recovery, and meanwhile, the heat is utilized to desorb impurity components of the adsorbed blast furnace gas. According to the invention, blast furnace gas pretreatment and a CO2 capture system are combined, so that the recycling of blast furnace gas and the efficient capture of CO2 are realized, the capture efficiency of CO2 is improved, the energy waste is reduced, and the cyclic operation of equipment is realized.

The utility model relates to the technical field of desulfurization towers, in particular to a blast furnace gas desulfurization tower device which comprises a tower body, and a discharging bin, a gas inlet bin, a pretreatment bin, a gas heating and temperature adjusting bin, a hydrolysis bin, a cooling bin, a desulfurization bin, a gas outlet bin and a medicament adding bin are sequentially arranged in the tower body from bottom to top. A heat exchanger used for heating is arranged in the coal gas heating and temperature adjusting bin, an organic sulfur hydrolytic agent is arranged in the hydrolysis bin, a heat exchanger used for cooling is arranged in the cooling bin, a desulfurizing agent is arranged in the desulfurizing bin, a plurality of chemical adding bins used for conveying chemicals are arranged at the top end of the tower body, and the bottom ends of the chemical adding bins are all communicated with a feeding pipe. The pretreatment bin, the hydrolysis bin and the desulfurization bin are all communicated with a blanking pipe. Therefore, the device disclosed by the utility model can simultaneously realize the functions of pretreatment, hydrolysis, hydrogen sulfide absorption and the like, meets the lower emission requirements of most users, and is simple, convenient to operate and small in occupied area.

The invention discloses a method for smoothly tapping first-time iron during blow-in of a blast furnace. In the blow-in process of the blast furnace, a series of measures of controlling the granularity of bottom coke, controlling the coke ratio of the whole furnace and slag R, optimizing a sleeper filling mode, quickly opening an iron notch after air supply to eliminate a hearth gas circulation dead zone, setting a main channel sand dam to prolong the slag spraying time of the iron notch and the like are taken. By setting the control points, the heat exchange effect of the hearth and the coal gas can be effectively improved, the slag iron temperature can be effectively increased at the earlier stage of the same full-furnace coke ratio, molten iron is low in Si and S, the physical temperature is sufficient, the slag iron can flow out smoothly, water slag can be flushed through iron for the first time, and the cost is reduced. And the desulfurization cost of the subsequent steelmaking procedure and the slag outward transportation cost are greatly reduced, and the working intensity of a stokehold is greatly reduced.

The present application relates to a kind of judgment method and processing method of blast furnace suspension material position, the judgment method of blast furnace suspension material position is used to judge the position of blast furnace suspension material, the processing method of blast furnace suspension material position, including if upper suspension material control wind speed and increase the coke of maintaining material surface shape, " sit material " by different ways is selected according to different suspension material position, quantitative calculation supplementary net coke weight, determine the distribution of net coke increase way.The present application has the advantages that: different furnace condition recovery method, parameter setting rule, coke adding method are invented for different suspension material position, improve the recovery speed after blast furnace suspension material;In upper suspension material, maintaining material surface shape can speed up subsequent wind process, reduce the possibility of secondary collapse, slide material accident;According to different suspension material position, different ways are selected to reduce wind " sit material ", according to different suspension material position, corresponding wind reduction method is adopted, can as far as possible speed up furnace condition recovery process, realize the optimization of suspension material recovery process.

The utility model discloses a blast furnace damping-down gas recovery system which comprises an ejection medium source and an ejector, the ejector is connected with a blast furnace and the ejection medium source, a gas outlet of the ejector is connected with a low-pressure gas conveying header pipe through a gas recovery pipe, and the blast furnace damping-down gas recovery system further comprises a high-calorific-value gas source; the high-calorific-value fuel gas source is connected with the coal gas recovery pipe through a fuel gas supply header pipe, the high-calorific-value fuel gas source is used for supplying high-calorific-value fuel gas to the coal gas recovery pipe, and the calorific value of the high-calorific-value fuel gas is higher than that of the blast furnace damping-down coal gas recovered by the coal gas recovery pipe. When the blast furnace damping-down gas recycling system is applied, the heat value of the recycled blast furnace damping-down gas can be increased, burners of downstream users are not prone to flameout, and the safety of recycling of the blast furnace damping-down gas is improved.

The invention belongs to the technical field of carbon neutralization, and discloses a synergistic efficient low-carbon electrolysis water and total-oxygen blast furnace coupled low-carbon steel coproduction system. Comprising an electrolyzed water system; a blast gas inlet of the total-oxygen blast furnace system is connected with an oxygen outlet of the electrolyzed water system, and the total-oxygen blast furnace system is used for receiving oxygen to generate top circulating coal gas rich in carbon monoxide and carbon dioxide; an inlet of the coal gas purification system is connected with a circulating coal gas outlet of the total-oxygen blast furnace system; a first inlet of the methanol synthesis system is connected with a hydrogen outlet of the water electrolysis system, a second inlet of the methanol synthesis system is connected with a purified gas outlet of the gas purification system, and the methanol synthesis system is used for receiving hydrogen and purified circulating gas to generate methanol; the circulating gas heating system is arranged in a circulating gas path between the gas purification system and the total-oxygen blast furnace system and is used for heating circulating gas returned to the blast furnace; an inlet of the flue gas decarburization system is connected with a combustion flue gas outlet of the circulating gas heating system, and the flue gas decarburization system is used for conveying carbon dioxide in the flue gas to the second inlet.