| 摘要 |
The method comprises introducing a reducing gas into a high-pressure reducing unit (1), withdrawing the reducing gas as top gas from the high-pressure reducing unit, adding a portion of the top gas to a feed gas as a recycle gas, where the reducing gas is generated by separating carbon dioxide from a gas mixture obtained from the addition of the recycle gas to the feed gas after compression process, and adding the recycle gas to the feed gas or the gas mixture. A direct reduction-export gas line pressure control device (10) is arranged to adjust a pressure of reducing gas and/or top gas. The method comprises introducing a reducing gas into a high-pressure reducing unit (1), withdrawing the reducing gas as top gas from the high-pressure reducing unit, adding a portion of the top gas to a feed gas as a recycle gas, where the reducing gas is generated by separating carbon dioxide from a gas mixture obtained from the addition of the recycle gas to the feed gas after compression process, and adding the recycle gas to the feed gas or the gas mixture. A direct reduction-export gas line pressure control device (10) is arranged to adjust a pressure of the reducing gas and/or a pressure of the top gas. The top gas withdrawn from the reduction unit is purified and/or subjected to a heat exchanger. The feed gas comprises an export gas from a plant for production of iron, a blast furnace gas, a crucible gas, a synthesis gas from a charcoal gasifier, a charcoal gas, and a coke-oven gas. The top gas comprises export gas obtained from a blast furnace or a reduction shaft or an off gas obtained from fluidized bed reduction aggregate for iron production, and has a pressure of 3-7 bars. An independent claim is included for a device for reducing iron-oxide-containing feedstocks. |
