Apparatus for direct iron reduction
阅读：354发布：2024-02-18
专利汇可以提供Apparatus for direct iron reduction专利检索，专利查询，专利分析的服务。并且In a direct iron reduction process of the type utilizing a rotary kiln, oxidizing gas is blown into the bed in the rotary kiln so as to increase the temperature of the bed and to increase the speed of movement of the gas in the bed. The rotary kiln used in this method has a cross-sectional configuration in the form of a ratchet wheel and is provided with a plurality of inlet ports for oxidizing gas at the roots of the teeth of the ratchet wheel. Partially reduced composite pellets containing iron ore and a carbonaceous material are admitted into one end of the rotary kiln which is provided with a fuel burner at the opposite end. The rotary kiln is further provided with a heat exchanger at said one end to heat the oxidizing gas by the exhaust gas from the rotary kiln.，下面是Apparatus for direct iron reduction专利的具体信息内容。
1. A rotary kiln for use in a direct iron reduction process, comprising: an outer shell; a perforated inner shell concentrically contained in said outer shell; a lining applied on the inner surface of said inner shell, at least a portion of said lining being comprised of porous bricks; and a plurality of partition walls for dividing the space between said inner and outer shells into a plurality of axially extending chambers for supplying oxidizing gas into the space within said lining through said porous bricks.
2. Apparatus for use in a direct iron reduction process, comprising: a rotary kiln including a plurality of inlet ports which are disposed to admit oxidizing gas in the circumferential direction along the inner wall of said rotary kiln, a fuel burner at one end of said rotary kiln, a heat exchanger located at the opposite end of said rotary kiln for preheating siad oxidizing gas, an inlet for partially reduced raw material pellets at said opposite end and a discharge port for the reduced pellets at said one end; a preheater for preheating and drying the raw material pellets; a fluidized bed of raw material pellets coupled between said inlet of said rotary kiln and said preheater; means for supplying reducing gas into said fluidized bed for partially reducing said preheated raw material pellets; and means for supplying the reducing gas exhausted from said fluidized bed into said rotary kiln at said one end.
3. The apparatus according to claim 2 wherein means is provided to incorporate carbonaceous substance into the partially reduced pellets between said fluidized bed and the inlet at said opposite end of the rotary kiln.
4. The apparatus according to claim 2 including means for discharging said reduced pellets into a cooler through said discharge port, and wherein said reducing gas exhausted from said fluidized bed is admitted into said rotary kiln at said one end through said cooler and said discharge port.
5. The apparatus according to claim 2 including means for supplying said reducing gas exhausted from said fluidized bed to said fuel burner of said rotary kiln.
6. The apparatus according to claim 2 including means for supplying the preheated air; preheated by said reducing gas exhausted from said fluidized bed, to said preheater for drying and preheating said raw material pellets.
7. The apparatus according to claim 2 wherein said means for supplying reducing gas into said fluidized bed comprises a fuel burner which generates CO and CO2 at a ratio of 2 : 1 or more.
8. The apparatus according to claim 2 wherein said raw material pellets comprise a mixture of a powder of iron ore, and a carbonaceous substance.
9. The apparatus according to claim 8 wherein said mixture further contains a desulfurization agent.
10. A rotary kiln comprising: a rotatable kiln member having a cross-sectional configuration generally in the form of a toothed rachet wheel; a plurAlity of inlet ports in said kiln member for receiving oxidizing gas at the roots of the respective teeth of said rachet wheel configuration; a cylinder located at one end of said kiln device into which the charge is admitted, at least a portion of said cylinder being located within said kiln device; and a heat exchanger interposed between the inner wall of said kiln device and the outer wall of said cylinder for preheating said oxidizing gas.
11. A rotary kiln according to claim 10 including means for injecting fuel into the end of said kiln opposite from said one end, and wherein said inlet ports for admitting the oxidizing gas are situated to admit the oxidizing gas in the circumferential direction along the inner wall of said rotary kiln.
12. The apparatus according to claim 1 wherein said lining is completely formed of said porous bricks.
13. The apparatus according to claim 2 wherein said rotary kiln has a cross-sectional configuration generally in the form of a toothed ratchet wheel.
14. The apparatus according to claim 13 wherein said oxidizing gas is admitted into said kiln through said inlets at the roots of the respective teeth of said ratchet wheel.
15. The apparatus according to claim 2 wherein said inlet for said partially reduced raw material pellets includes a cylinder at least partially located within said inner wall of said rotary kiln, and said heat exchanger is at least partially located between said cylinder and said inner wall of said rotary kiln.
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