Corex®-Midrex® Process
Reduction gas heater system for combined Corex®-Midrex® process
The direct reduced iron is produced in a conventional Midrex shaft; the reduction gas used for this is a purified carbon monoxide/hydrogen mixture from a Corex plant.
The reduction gas is heated in a two-stage reduction gas heater system.
| 1994 to today |
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2 reduction gas furnace plants of 2 furnaces each |
| Volume flow reduction gas: |
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max. 246,000 Nm³/h (CO, H2, N2, CO2) |
| Product outlet temperature: |
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max 850°C |
| Firing capacity: |
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Max. 85 + 46 MW |
| NOx Emissions: |
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< 300 mg / Nm³ |
| Delivery time: |
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< 12 - 14 months (delivery FOB)
< 20 months (mechanical completion) |
| 2-stage heating of the reduction gas |
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| 1st stage: convective preheating of reduction gas to approx. 440°C |
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To optimise the use of energy in the plant as a whole, the use of low-calorie gas is possible |
| 2nd stage: partial oxidation of the preheated reduction gas with oxygen in the downstream pressurised container to approx. 850°C |
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| Process optimisation: |
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desired plant size = 125% Saldanha |
| Partial oxidation, Q_O2 burners = 46 MW |
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| Dp_v reduction gas < 50 kPa |
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