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System and method for reducing and cooling metallized pellets

A technology of metallized pellets and cooling gas, applied in the direction of furnace type, furnace, gas emission reduction, etc., can solve problems such as product carbon content fluctuations, achieve the effects of shortened residence time, improved compactness, and improved production efficiency

Pending Publication Date: 2018-04-06
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, cooling air with this composition is likely to cause fluctuations in the carbon content of the product

Method used

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  • System and method for reducing and cooling metallized pellets
  • System and method for reducing and cooling metallized pellets
  • System and method for reducing and cooling metallized pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The cooling air temperature is 50°C, the CH in the cooling air 4 The volume fraction is 80%, H 2 O (g) volume fraction is 20%, cooling gas pressure 0.1MPa, cooling gas enters the flow rate 500Nm of the cooling section 22 of air-based shaft furnace 3 / t DRI (DRI, direct reduced iron). Compared with the existing Midrex process, since the catalytic reforming of methane is an endothermic reaction, the residence time of the metallized pellets in the cooling section 22 is shortened by 1 / 4, and the amount of cooling gas is reduced from 1000Nm in the traditional Midrex process. 3 / t reduced to 500Nm 3 / t. Adding an appropriate amount of water vapor into the cooling air suppresses the carburization reaction and iron carburization reaction of the cooling section 22 in the shaft furnace, and can stably control the carbon content of the metallized pellets below 1%. The main component of the tail gas discharged from the cooling section 22 of the shaft furnace is CH 4 , with a s...

Embodiment 2

[0088] The cooling air temperature is 70°C, the CH in the cooling air 4 The volume fraction is 95%, H 2 O (g) volume fraction is 5%, cooling gas pressure 0.2MPa, cooling gas enters the flow rate 700Nm of the cooling section 22 of air-based shaft furnace 3 / tDRI. Compared with the existing Midrex process, since the catalytic reforming of methane is an endothermic reaction, the residence time of the metallized pellets in the cooling section 22 is shortened by 1 / 5, and the amount of cooling gas is reduced from 1000Nm in the traditional Midrex process. 3 / t reduced to 700Nm 3 / t. Adding an appropriate amount of water vapor into the cooling air suppresses the carburization reaction and iron carburization reaction of the cooling section 22 in the shaft furnace, and can stably control the carbon content of the metallized pellets below 1%. The main component of the tail gas discharged from the cooling section 22 of the shaft furnace is CH 4 , with a small amount of H 2 O, CO and...

Embodiment 3

[0090] The cooling air temperature is 60°C, the CH in the cooling air 4 The volume fraction is 85%, H 2 O (g) volume fraction is 15%, cooling gas pressure 0.15MPa, cooling gas enters the flow rate 600Nm of the cooling section 22 of air-based shaft furnace 3 / tDRI. Compared with the existing Midrex process, since the catalytic reforming of methane is an endothermic reaction, the residence time of the metallized pellets in the cooling section 22 is shortened by 1 / 4, and the amount of cooling gas is reduced from 1000Nm in the traditional Midrex process. 3 / t reduced to 600Nm 3 / t. Adding an appropriate amount of water vapor into the cooling air suppresses the carburization reaction and iron carburization reaction of the cooling section 22 in the shaft furnace, and can stably control the carbon content of the metallized pellets below 1%. The main component of the tail gas discharged from the cooling section 22 of the shaft furnace is CH 4 , with a small amount of H 2 O, CO a...

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Abstract

The invention relates to a gas-based shaft furnace reducing system. The system comprises a gas-based shaft furnace, a cooling gas supply system and a reducing gas supply system, wherein the cooling gas supply system is used for preparing water vapor and desulfurated natural gas into cooling gas with main components of methane and water, and conveying the cooling gas to the gas-based shaft furnace;and the reducing gas supply system is used for treating cooling tail gas used by the gas-based shaft furnace to obtain reducing gas with carbon monoxide and hydrogen gas as main components, and conveying reducing gas to the gas-based shaft furnace. The invention further relates to a method for reducing and cooling metallized pellets. According to the system and the method disclosed by the invention, methane and water vapor in cooling gas have reforming reaction to generate CO and H2 under catalytic action of hot-stated metallized pellets (also can be ferrugination pellets), the reaction is remarkable in heat absorbing effect, retention time, at a cooling section of the gas-based shaft furnace, of the metallized pellets is remarkably shortened, dosage of cooling gas is also remarkably reduced, and compaction and production efficiency improvement of a shaft furnace body are facilitated.

Description

technical field [0001] The invention relates to the technical field of reduction metallurgy, and more specifically relates to a system and method for reducing and cooling metallized pellets using a gas-based shaft furnace. Background technique [0002] Compared with traditional blast furnace ironmaking, gas-based shaft furnace (hereinafter referred to as shaft furnace) ironmaking does not require coking and sintering, significantly reduces pollutant emissions, and significantly lower energy consumption. The metallization rate of shaft furnace sponge iron can reach more than 92%, and the impurity content is low. It can effectively dilute harmful elements in short-process electric furnace steelmaking with a suitable proportion (about 70%) of scrap steel, so the shaft furnace sponge iron product is an electric furnace High-quality raw material for short-process steelmaking. [0003] The temperature of the metallized pellets produced in the reduction section of the shaft furnac...

Claims

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Application Information

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IPC IPC(8): C21B13/02
CPCY02P10/143C21B13/02C21B13/0046C21B13/0086
Inventor 韩志彪邓君唐敬坤冯鲁兴刘亮员晓范志辉吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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