A supply heat quantity estimating method includes: estimating a change in carried-out sensible heat by in-furnace passing gas and a change in carried-in sensible heat supplied by a raw material preheated by the in-furnace passing gas, and estimating a quantity of heat supplied to the pig iron in a blast furnace in consideration of the estimated changes in the carried-out sensible heat and carried-in sensible heat. The estimating includes: estimating the carried-out sensible heat in consideration of the quantity of heat released to an outside, and estimating the change in the carried-in sensible heat in consideration of a change in a surface height of the raw material; and estimating a quantity of heat held in a deadman coke, and estimating the quantity of heat supplied to the pig iron in the blast furnace in consideration of the estimated quantity of heat held in the deadman coke.

Provided are a method and an arrangement for operating a metallurgical furnace. The method comprises a feeding step, and a temperature controlling step for controlling the temperature of a molten metal layer and a slag layer in a furnace space of the metallurgical furnace. The temperature controlling step comprises a first measuring step for measuring the slag temperature (T.sub.slag), a second measuring step for measuring the slag liquidus temperature (T.sub.slag, liquidus), and a calculating step for calculating a superheat temperature (T.sub.superheat) by calculating the temperature difference between the slag temperature (T.sub.slag) and the slag liquidus temperature (T.sub.slag, liquidus). In case the calculated superheat temperature (T.sub.superheat) is outside a predefined superheat temperature range (T.sub.superheat set), the method comprises an adjusting step for adjusting to adjust the actual superheat temperature. Also provided are computer program products.

A geothermally powered iron production subsystem includes using heat transfer fluid heated by a geothermal system with a wellbore extending from a surface into an underground magma reservoir. A hopper receives iron ore that is crushed and provided to a blast furnace, along with limestone and coke. The blast furnace is heated by a heat exchanger configured to receive the heat transfer fluid heated by the geothermal system to generate the heat provided to the blast furnace. One or more components of the iron production subsystem may also be powered by the heated heat transfer fluid.

A blast furnace operation method according to one aspect of the present invention includes: a process of acquiring a correlation between a carbon consumption in reducing gas and a reduction InputC in specific carbon consumption caused by blowing the reducing gas into the blast furnace per molar ratio C/H of carbon atoms to hydrogen atoms in the reducing gas; a process of determining a carbon consumption in the reducing gas where the reduction InputC in specific carbon consumption is a predetermined target value or higher on the basis of the correlation acquired per C/H; and a process of adjusting the amount of the reducing gas blown into the blast furnace on the basis of the determined carbon consumption in the reducing gas and the carbon proportion in the reducing gas.

A fine ratio measuring method and apparatus. The fine ratio measuring method includes a step S1 of measuring a distance between a distance measuring device and lumps of material, a step S2 of calculating a feature quantity from distance data obtained in the step S1, and a step S3 of converting the feature quantity calculated in step S2 to a fine ratio. The feature quantity calculated in step S2 represents distance variation calculated from the distance data obtained in the step S1. A higher fine ratio in lumps of material means greater microscopic distance variation caused by microscopic irregularities in the surface of the lumps of material in the height direction within a three-dimensional shape. Therefore, by using the distance variation as the feature quantity, the fine ratio in the lumps of material can be measured in real time with high accuracy.

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.

A method for controlling stability of gas flow at the periphery of a blast furnace, including the following steps: constructing a database; and selecting blast furnace operating parameters satisfying a first preset condition from the database to generate an instruction for setting the blast furnace operating parameters for a next operating stage. The first preset condition includes: PD<a preset value PD0, and the blast furnace operation parameters corresponding to a minimum value of PU are selected when the condition is satisfied.

An estimation method of the depositional shape of a charged material inside a blast furnace formed after coke inside the blast furnace is consumed by using a burner when the blast furnace is caused to start up. The estimation method includes estimating the depositional shape of a charged material inside a blast furnace in a blowing down with lowering stock level, estimating a charged region of coke inside the blast furnace from the estimated depositional shape of the charged material inside the blast furnace and from the shape of a solidified layer on a bottom part inside the blast furnace, estimating an amount of coke inside the blast furnace that is consumed by using the burner, and estimating, from the estimated amount of the coke inside the blast furnace, the depositional shape of a charged material inside the blast furnace formed after consumption of the coke inside the blast furnace.

A method of ironmaking using full-oxygen hydrogen-rich gas which includes hot transferring and hot charging the high-temperature coke, sinter and pellet into the ironmaking furnace through transferring and charging device, and injecting oxygen and hydrogen-rich combustible gas at a predetermined temperature into the ironmaking furnace through the oxygen tuyere and the gas tuyere disposed at the ironmaking furnace, respectively. It also provides an apparatus for ironmaking using full-oxygen hydrogen-rich gas which includes a raw material system, a furnace roof gas system, a coke oven gas injecting system, a dust injecting system, a slag dry-granulation and residual heat recovering system and an oxygen system. Additionally an apparatus and method for hot transferring and hot charging of ironmaking raw material is disclosed.

A detection wave from a transmitting/receiving means is guided to the interior of a blast furnace via an antenna and a reflecting plate, and when a reflected wave from the surface of a loaded material is reflected by the reflecting plate and received by the transmitting/receiving means, the reflecting plate is rotated together with the antenna, or the reflecting plate is rotated additionally, and the surface profile of the loaded material is measured by scanning the surface of the loaded material in a linear manner or a planar manner during the turning of a chute or for each prescribed turn of the chute. A deposition profile is obtained on the basis of this surface profile and is compared to a predetermined theoretical deposition profile, and the chute is controlled so as to correct the error with respect to the theoretical deposition profile and then which new loaded material is introduced.