摘要:
The present invention provides a method of ironmaking using full-oxygen hydrogen-rich gas which comprises hot transferring and hot charging the high-temperature coke, sinter and pellet into the ironmaking furnace (3) through transferring and charging device, and injecting oxygen and hydrogen-rich combustible gas at a predetermined temperature into the ironmaking furnace (3) through the oxygen tuyere and the gas tuyere disposed at the ironmaking furnace (3), respectively. It also provides an apparatus for ironmaking using full-oxygen hydrogen-rich gas which comprises 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 (11). Additionally, it further provides an apparatus and method for hot transferring and hot charging of ironmaking raw material.
摘要:
A method for operation of a blast furnace able to greatly reduce the CO 2 emission and enabling stable production of pig iron over a long period of time in a commercial blast furnace, that is, a method for operation of a blast furnace in which iron ore and coke are charged from a furnace top and is blown in pulverized coal from a usual tuyere, comprising blowing in a gas containing at least one of hydrogen and hydrocarbon from the usual tuyere together with the pulverized coal and blowing a gas comprised of a top gas of the blast furnace from which carbon dioxide and steam is removed from a shaft tuyere into the blast furnace.
摘要:
The invention relates to a plant combination for producing steel, comprising a blast furnace (1) for producing raw iron, a converter steel mill (2) for producing raw steel, a gas line system for gases that arise in the production of raw iron and the production of raw steel, and a power plant (3) for generating current. The power plant (3) is operated by means of a gas that comprises at least a partial amount of the blast-furnace gas (7) arising in the blast furnace (1) in the production of raw iron and/or a partial amount of the converter gas (9) arising in the converter steel plant (2). According to the invention, a chemical or biotechnology plant (12) is provided, which is connected to the gas line system and is connected in parallel with the power plant (3) with regard to the gas supply. The gas line system comprises a gas diverter (13) for diving the gas mass flows fed to the power plant (3) and to the chemical or biotechnology plant (12), which gas diverter can be operationally controlled. Externally obtained current (15) and power-plant current (16) generated by the power plant (3) of the plant combination are used to cover the current demand of the plant combination. The current proportion of the externally obtained current (15) with respect to the total current demand of the plant combination is defined as variable process quantity and the useful-gas amount (N1) fed to the power plant process is determined in dependence on said process quantity.
摘要:
Method of operating a blast furnace installation comprising a top gas recycle blast furnace (1) and hot stones (20), whereby a hydrocarbon containing fuel (10) is transformed into a transformed gas stream (15) consisting mainly of CO and H 2 and substantially devoid of hydrocarbon, whereby a low-heating-value gaseous fuel (27) is generated comprising a mixture of said transformed gas (15) with a portion of the CO 2 - rich tail gas (8) obtained by decarbonatation of the blast furnace gas (3), and whereby said low-heating-value fuel (27) is used to heat the hot furnace gas (9, 19) is heated before being injected into the blast-furnace (1).
摘要:
A blast furnace system is used wherein the coke rate is decreased by recycling upgraded top gas from the furnace back into its shaft section (which upgraded top gas is heated in a tubular heater prior to being recycled). The top gas, comprising CO, CO 2 and H 2 , is withdrawn from the upper part of the blast furnace; cooled and cleaned of dust, water, and CO 2 for increasing its reduction potential and is heated to a temperature above 850°C before being recycled thus defining a first gas flow path used during normal operation of the blast furnace. Uniquely, a second gas flow path for continued circulation of top gas selectively through the heater and a cooler during operation interruptions of the blast furnace allows time for gradual controlled cool down of the heater in a manner to avoid heat-shock damage to the tubular heater.
摘要:
A process serves for the carbothermic/electrothermic production of crude iron or other base products in furnaces (23) by using mixtures comprising iron ore, oxides and/or carbonates of calcium (A) and carbonaceous materials, with formation of carbon monoxide-containing gases. In order to provide a novel process having an increased level of energy efficiency which provides high quality grade synthesis gas, it is proposed that the iron ore and/or the oxides and/or carbonates of calcium are, in whole or in part, first used as bulk material together with organic materials (3) in an upstream vertical moving-bed reactor (2) constructed as a counterflow gasifier, which moving-bed reactor has a bulk material at least in part comprising alkaline substances as moving bed, and a reduction (12) and oxidation zone (6), the organic materials are in whole or in part converted to synthesis gas (9) by gasification with oxygen-containing gases (8) and the remaining bulk material (22) is at least in part provided as raw material mixture for the carbothermic production of crude iron or electrothermic production of base products.
摘要:
In a blast furnace plant (10), at least three regenerative heaters (14.1, 14.2, 14.3) are cyclically operated on blast and on gas: while a regenerative heater is operated on gas, hot flue gas is produced and caused to flow through the regenerative heater so as to heat the heat storage elements (46); and while a regenerative heater is operated on blast, process gas (32), i.e. a CO-rich fraction of the top gas (16), is blown through the regenerative heater so that the process gas takes up heat from the heat storage elements. During a changeover of a regenerative heater from on-blast to on-gas operation, the regenerative heater is purged from process gas using flue gas collected after having flown through at least one of the regenerative heaters.
摘要:
Provided is a method for operating a blast furnace, the method being capable of avoiding, particularly, a failure to heat a furnace top portion at low cost even in the case of performing a low-RAR operation (the reduction of carbon dioxide emissions). During the operation of a blast furnace using carbon iron composite as a portion of a charging material, one, two, or three of the injection temperature, injection rate, and vertical injection position of gas injected from a shaft portion are controlled in combination depending on a top gas temperature, whereby the decrease in temperature of the top gas is suppressed. Therefore, a failure to heat a furnace top portion can be avoided at low cost without significant capital investment even in the case of performing a low-RAR operation. Depending on the temperature of a shaft gas injected from the shaft portion, the vertical injection position of the shaft gas is adjusted to a position at which the inside temperature of the blast furnace is lower than the temperature of the shaft gas; hence, the inside of the blast furnace is not cooled by the shaft gas.
摘要:
In the method according to the invention for reducing carbon dioxide during the production of steel, carbon dioxide resulting from the steel production process is reacted with an electropositive metal in a combustion step and the resultant carbon monoxide is fed back into the steel production process. In said process, the carbon monoxide can be used in a direct reduction method as a reduction gas or can be fed to a blast furnace process. The reacted metal can also be recovered by electrochemical conversion from its oxides or salts. In particular, a form of regenerative energy can be used to recycle the electropositive metal.