The present disclosure discloses a system and a method for controlling gas injection in blast furnace. The system for controlling gas injection in blast furnace includes a coke oven gas pipeline, a decarbonized gas pipeline, a protection nitrogen pipeline, and a main gas pipeline. The coke oven gas pipeline and the decarbonized gas pipeline are connected with the main gas pipeline, and distributing branch pipelines of main gas pipeline are located at nozzles of tuyeres of blast furnace. The protection nitrogen pipeline is connected to the main gas pipeline. A group of measuring components are used for each of the pipelines to detect operation status thereof. The system controls operation status of the pipelines by controlling pipelines with valves. The system and method may ensure that the system for injecting coke oven gas through tuyeres can stop running safely in abnormal situations.

The invention relates to a method for operating a steelworks, for example in a blast furnace converter route, or with a direct reduction of iron ore with hydrogen with downstream electrical steel route, preferably additionally a secondary steel route. To carry out the method, the following are balanced: A) a number of starting material flows of supplied starting materials, B) a number of by-product material flows from emitted by-products, and C) a number of energy flows of used energy.

In an apparatus, comprising a plant for the electrothermic preparation of ethyne from coal or a hydrocarbon-containing gas providing a hydrogen-containing gas, a plant for the production of iron by reduction of oxidic iron ores, and at least one gas conduit which feeds the hydrogen-containing gas from the plant for the electrothermic preparation of ethyne as reducing agent to the plant for the production of iron by reduction of oxidic iron ores, electric energy can be utilized for the production of iron from oxidic iron ores by feeding a hydrogen-containing gas, obtained in the electrothermic preparation of ethyne from coal or a hydrocarbon-containing gas, as reducing agent to the plant for the production of iron by reduction of oxidic iron ores.

A process for processing metal ore includes: reducing a metal ore, particularly a metallic oxide, in a blast furnace shaft; producing furnace gas containing CO.sub.2, in the blast furnace shaft; discharging the furnace gas from the blast furnace shaft; directing at least a portion of the furnace gas directly or indirectly into a CO.sub.2-converter; and converting the CO.sub.2 contained in the furnace gas into an aerosol consisting of a carrier gas and C-particles in the CO.sub.2-converter in the presence of a stoichiometric surplus of C; directing at least a first portion of the aerosol from the CO.sub.2-converter into the blast furnace shaft; and introducing H.sub.2O into the blast furnace shaft. By virtue of the reaction C+H.sub.2O.fwdarw.CO.sub.2+2H, nascent hydrogen is produced in the blast furnace which causes rapid reduction of the metal ore. The speed of reduction of the metal ore is thus increased, and it is possible to increase either the throughput capacity of the blast furnace or to reduce the size of the blast furnace. An aerosol in the form of a fluid is easily introducible into the blast furnace shaft.

A method for the reduction of a metal oxide-containing material in which a reducing gas that is obtained using ammonia (NH.sub.3) is used. The reducing gas is supplied to a reduction reactor containing the metal oxide-containing material, and a top gas is discharged from the reduction reactor. At least one sub-quantity of the top gas is used as components in the preparation of the reducing gas, optionally after the top gas is prepared. A device for the reduction of the metal oxide-containing material that includes a reduction reactor, a top gas discharge line for discharging top gas, a supply line for an ammonia contribution, a preparation system for preparing the reducing gas, a supply line for the ammonia contribution leading into the preparation system, and a feed line for feeding the reducing gas and/or a precursor of the reducing gas to the reduction reactor.

Provided is a method of operating a blast furnace, including generating a regenerative methane gas using a blast furnace by-product gas, and blowing a blast gas and a reducing agent into the blast furnace from a tuyere, in which the blast gas is oxygen gas, the regenerative methane gas is used as at least part of the reducing agent, and the oxygen gas and/or the regenerative methane gas is preheated before being blown into the blast furnace from the tuyere.

A hydrogen-rich blast furnace ironmaking system based on mass-energy conversion, comprising a water electrolysis system (2). The water electrolysis system (2) is separately connected to a hydrogen storage tank (3) and an oxygen storage tank (4); a gas outlet of the hydrogen storage tank (3) is connected to a hydrogen compressor (5); an outlet of the hydrogen compressor (5) is connected to a hydrogen buffer tank (6); the hydrogen buffer tank (6) is connected to a hydrogen injection valve group (7); the hydrogen injection valve group (7) is connected to a hydrogen preheating system (8); and the hydrogen preheating system (8) is connected to a tuyere of a blast furnace body (1) or a hydrogen injector at the lower portion of the furnace body.

Provided is a steelmaking line contributing to the realization of a method that achieves energy saving and CO.sub.2 emission reduction when producing reduced iron from iron oxide. The steelmaking line comprises: a blast furnace configured to reduce iron oxide; a reducing furnace configured to reduce iron oxide; a methane synthesizer configured to synthesize methane from blast furnace gas and/or furnace top gas, and hydrogen gas; a blower configured to blow the methane gas synthesized by the methane synthesizer into the blast furnace; a heat-reformer configured to heat or heat-reform the blast furnace gas and/or the furnace top gas, and the methane gas synthesized by the methane synthesizer, to generate reducing gas; a reducing gas blower configured to blow the reducing gas into the reducing furnace; and a supply path configured to supply the furnace top gas to the methane synthesizer and/or the heat-reformer.

The present invention pertains to the field of steel smelting, specifically to a method for steel production in a blast furnace and a converter based on carbon cycling. The method comprises the following steps: 1. Smelting iron in a blast furnace to obtain molten iron; 2. Introducing the aforementioned molten iron into a converter and carrying out steel refining within the converter to obtain molten steel and untreated converter gas; 3. Subjecting the untreated converter gas to pressurisation, deoxygenation, dehydration, and decarbonisation treatments to obtain synthesis gas and treated converter gas; 4. Recycling the treated converter gas back into the blast furnace to regulate the ratio of reductive gases within the furnace atmosphere.

Beneficial Effects: The method enables the cyclic utilisation of converter gas. By decarbonising the converter gas and recycling it back into the blast furnace, the content of reductive gases in the furnace atmosphere is enhanced. This promotes indirect reduction within the blast furnace while decreasing direct reduction, thereby reducing the consumption of carbonaceous fuel during the blast furnace iron smelting process and effectively lowering CO2 emissions.

A hydrogen-rich blast furnace ironmaking system based on mass-energy conversion, comprising a water electrolysis system (2). The water electrolysis system (2) is separately connected to a hydrogen storage tank (3) and an oxygen storage tank (4); a gas outlet of the hydrogen storage tank (3) is connected to a hydrogen compressor (5); an outlet of the hydrogen compressor (5) is connected to a hydrogen buffer tank (6); the hydrogen buffer tank (6) is connected to a hydrogen injection valve group (7); the hydrogen injection valve group (7) is connected to a hydrogen preheating system (8); and the hydrogen preheating system (8) is connected to a tuyere of a blast furnace body (1) or a hydrogen injector at the lower portion of the furnace body.