Abstract:
In producing hydrogen by reforming organic matter, excess moisture vapour is added to an exhaust gas (g0) containing carbon monoxide generated by a metallurgical furnace and a shift reaction is carried out, thereby constituting a mixed gas (g) containing hydrogen produced by the shift reaction, and carbonic acid gas, and water vapour not consumed by the shift reaction. Said mixed gas (g) is brought into contact with organic matter, bringing about a reforming reaction which reduces the molecular weight of the organic matter, and the product of the reforming reaction is steam reformed, thereby producing hydrogen.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for direct reduction ironmaking capable of collecting and utilizing most of waste heat generated in a natural gas reformer in a reforming process and of achieving excellent energy efficiency, and to provide an apparatus for production of a reducing gas therefor.SOLUTION: Reforming of a natural gas is performed by charging the natural gas 1, steam 2 and oxygen 6 in a reformer 50 to burn partially. The obtained reducing gas containing hydrogen and carbon monoxide is supplied to a shaft furnace 30 through a line 56, and an iron ore 7 is reduced in the shaft furnace 30 to produce a direct reduction iron 8. The waste gas generated in the shaft furnace 30 is introduced into a carbon dioxide-removing device 40, and after removal of carbon dioxide, the waste gas is reutilized as the reducing gas in the shaft furnace 30 through a waste gas-reutilizing line 49.
Abstract:
The method for melting pig irons in a blast furnace (1) operated with oxygen or in a smelting reduction system, with a reduction region, comprises recirculating pure raw gas evacuated from the reduction region under the addition of hydrocarbons in the reduction region, mixing with hydrocarbons, and then blending with a reduction gas, which has a temperature over 1000[deg] C and is produced by partially oxidizing the hydrocarbons by oxygen gas with an oxygen content over 90 vol.%, for the formation of a recirculation gas with a temperature over 800[deg] C. The method for melting pig irons in a blast furnace (1) operated with oxygen or in a smelting reduction system, with a reduction region, comprises recirculating pure raw gas evacuated from the reduction region under the addition of hydrocarbons in the reduction region, mixing with hydrocarbons, and then blending with a reduction gas, which has a temperature over 1000[deg] C and is produced by partially oxidizing the hydrocarbons by oxygen gas with an oxygen content over 90 vol.%, for the formation of a recirculation gas with a temperature over 800[deg] C. The recirculation gas is recirculated after an auto-reforming process. The auto-reforming process takes place in a reformer (11) with corresponding catalyst. The recirculation gas for recirculating into the reduction region of the blast furnace over blast tuyeres (4) is introduced in the plane over the blast tuyeres or into the pit of the blast furnace. The recirculation of the recirculation gas takes place over the blast tuyeres with fine-carbon injector. A heat recovery takes place from the raw gas. A drying dedusting of the raw gas takes place for cleaning the raw gas. The hydrocarbons supplied to the pure raw gas are the hydrocarbon (C nH m) or its mixture.
Abstract:
PURPOSE:To facilitate the separation of a reducing furnace and a reducing gas producer and to perform the direct reduction operation of iron ore stably in a direct reducing device for iron ore by providing a high temp. shut-off valve between the reducing gas producer and the reducing furnace. CONSTITUTION:A mixture of hydrocarbon and steam or CO2 is fed into a steam reformer 1 as a reducing gas reforming furnace, and is fed as a reducing gaseous mixture of H2 and CO to a reducing furnace 2, by which iron ore is subjected to solid phase reduction. In this case, a high temp. shut-off valve 20 is installed to a line 6 connecting the reformer 1 and the furnace 2, and a gas cooler 21 is provided to a branch line 23. To interrupt the operation of the furnace 2 temporarily on generation of abnormality in the part associating to the furnace 2, the valve 20 is closed, and the high temp. reducing gas from the reformer 1 is flowed to a cooler 21 where it is cooled, then it is released. Since the operation of the reformer 1 can be continued without interruption, it responds immediately when the operation of the furnace 2 is resumed.