DIRECT SMELTING PLANT WITH WASTE HEAT RECOVERY UNIT
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Accused Products
Abstract
A direct smelting plant for producing molten metal from metalliferous feed material in a direct smelting process is disclosed. The plant includes a process controller for adjusting the volumetric flow rate of fuel gas supplied to a burner unit of at least one of the unit operations of the plant so as to at least meet selected requirements of the plant to operate the direct smelting process.
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Citations
70 Claims
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1-35. -35. (canceled)
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36. A direct smelting plant for producing molten metal from metalliferous feed material in a direct smelting process that includes:
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(a) a direct smelting vessel for producing molten metal, molten slag, and an off-gas by way of a process for direct smelting metalliferous feed material in the vessel; (b) a first fuel gas supply apparatus for supplying off-gas from the direct smelting vessel for use as a fuel gas in burner units of two or more unit operations of the plant and/or external to the plant; (c) a second fuel gas supply apparatus for supplying another fuel gas, such as natural gas, from another source to the burner unit of at least one of the unit operations, and (d) a process controller for adjusting the volumetric flow rate of fuel gas supplied to a burner unit of at least one of the unit operations so as to at least meet selected requirements of the plant to operate the direct smelting process. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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60. A molten bath-based direct smelting process for producing molten metal from a metalliferous feed material in a direct smelting plant that includes:
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(a) direct smelting metalliferous feed material in a direct smelting vessel containing a molten bath of metal and slag and producing molten metal, molten slag, and an off-gas, the process having different process states; (b) supplying off-gas produced in the vessel during a smelting campaign as a fuel gas to burner units of two or more unit operations of the plant and/or external to the plant, and (c) supplying another fuel gas, such as natural gas, from another source to the burner unit of at least one of the unit operations, (d) adjusting the volumetric flow rate of fuel gas supplied to the burner units of the unit operations so as to at least meet requirements of the plant during the course of the process. - View Dependent Claims (61, 62, 63)
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64. A direct smelting plant for producing molten metal from metalliferous feed material in a direct smelting process that includes:
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(a) a direct smelting vessel for producing molten metal, molten slag, and an off-gas by way of a process for direct smelting metalliferous feed material in the vessel; (b) at least two off-gas processing units for receiving and combusting the off-gas; (c) a first fuel gas supply apparatus for supplying off-gas from the direct smelting vessel for use in burner units of the off-gas processing units; (d) a second fuel gas supply apparatus for supplying another fuel gas, such as natural gas, from another source to burner units of said at least two off-gas processing units; (e) process controller for controlling; i) volumetric flow of off-gas to one of the off-gas processing units to meet the requirenments of the unit with a balance of off-gas being supplied to a remaining off-gas processing unit or units; ii) volumetric flow of the other fuel gas to the off-gas processing units. - View Dependent Claims (65, 66, 67, 68, 69, 70)
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Specification