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System and method for smelting direct reduced iron through pyrolytic oil gas

A technology for pyrolysis of oil and gas and reduced iron, applied in the direction of reducing gas emissions, furnace types, furnaces, etc., can solve the problems of unutilized sensible heat of cooling tail gas, low energy utilization rate, large heat loss, etc., and achieve high energy utilization efficiency. , The effect of low maintenance cost and reduced production energy consumption

Pending Publication Date: 2017-11-28
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing systems and methods for smelting direct reduced iron have defects such as large heat loss, low energy utilization rate, high cost, and unutilized sensible heat of cooling tail gas.

Method used

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  • System and method for smelting direct reduced iron through pyrolytic oil gas
  • System and method for smelting direct reduced iron through pyrolytic oil gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Such as Figure 1-2 Shown, the present invention utilizes pyrolysis oil gas to smelt the technology of direct reduced iron as follows:

[0085] Iron ore direction: the iron concentrate lump ore with an iron grade of 67% is transported to the receiving hopper 40, and enters the preheating bin 60 after passing through the slender feeding leg 50 with a length of 6 m and a diameter of 0.4 m, and in the preheating bin 60 The iron ore is preheated to 200°C and put into the gas-based shaft furnace 30;

[0086] Reducing gas direction: the high-temperature pyrolysis oil gas (containing 20g / Nm3 of tar) produced by pyrolyzing lignite in the pyrolysis furnace 10 is heated by the supplementary heating furnace 20 to raise the temperature to 930°C and then passed into the gas-based shaft furnace 30 as reducing gas Countercurrent upward reduction of iron ore to form 500°C top gas and obtain direct reduced iron products, 500°C top gas is discharged from the top of the gas-based shaft f...

Embodiment 2

[0090] Such as Figure 1-2 Shown, the present invention utilizes pyrolysis oil gas to smelt the technology of direct reduced iron as follows:

[0091] Iron ore direction: the iron concentrate lump ore with an iron grade of 57% is transported to the receiving hopper 40, and enters the preheating bin 60 after passing through the slender feeding leg 50 with a length of 6 m and a diameter of 0.4 m, and in the preheating bin 60 The iron ore is preheated to 350°C and put into the gas-based shaft furnace 30;

[0092] Direction of reducing gas: the high-temperature pyrolysis oil gas (containing 100g / Nm3 of tar) produced by pyrolyzing lignite in the pyrolysis furnace 10 is heated by the supplementary heating furnace 20 to raise the temperature to 980°C and then passed into the gas-based shaft furnace 30 as reducing gas Countercurrent upward reduction of iron ore to form 600°C top gas and obtain direct reduced iron products. The 600°C top gas is discharged from the top of the gas-based...

Embodiment 3

[0096] Such as Figure 1-2 Shown, the present invention utilizes pyrolysis oil gas to smelt the technology of direct reduced iron as follows:

[0097] Iron ore direction: the iron concentrate lump ore with an iron grade of 50% is transported to the receiving hopper 40, and enters the preheating bin 60 after passing through the slender feeding leg 50 with a length of 4 m and a diameter of 0.5 m, and in the preheating bin 60 The iron ore is preheated to 300°C and put into the gas-based shaft furnace 30;

[0098] Direction of reducing gas: the high-temperature pyrolysis oil gas (containing 80g / Nm3 of tar) produced by pyrolyzing lignite in the pyrolysis furnace 10 is heated by the supplementary heat furnace 20 to raise the temperature to 1000°C and then passed into the gas-based shaft furnace 30 as reducing gas Reducing iron ore countercurrently upwards to form 700°C top gas and obtain direct reduced iron products. The 700°C top gas is discharged from the top of the gas-based sha...

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Abstract

The invention relates to a system and method for smelting direct reduced iron through pyrolytic oil gas. The system comprises a pyrolyzing furnace, a heating device and a gas-based shaft furnace which are connected in sequence. The method is implemented through the system. Through the system and the method, sensible heat of the high-temperature pyrolytic oil gas is sufficiently and efficiently utilized, and the energy source utilization efficiency is high; low-cost low-rank coal serves as a raw material to produce reducing gas instead of using a large amount of natural gas, so that gas-based shaft furnace production lines are built in areas scarce in natural gas, high-quality direct reduced iron is produced, and the product cost is obviously reduced; and a lot of expensive reforming catalysts do not need to be used, the maintenance cost is low, and the content of sulphur in the reducing gas of the gas-based shaft furnace does not need to be strictly limited.

Description

technical field [0001] The invention belongs to the technical field of direct reduction ironmaking, and more specifically relates to a system and method for smelting direct reduced iron by using pyrolysis oil gas. Background technique [0002] Direct reduced iron (DRI), also known as sponge iron, is an iron-containing product obtained by direct reduction of iron ore below the melting temperature. Sponge iron is a substitute for scrap steel, an indispensable impurity diluent for electric furnace smelting of pure and high-quality steel, a high-quality coolant for converter steelmaking, and an indispensable raw material for the development of short iron and steel metallurgy processes. In 2015, the world's annual output of direct reduced iron reached 75.2 million tons, a record high. my country has listed the direct reduction process as one of the main directions for the development of the iron and steel industry. [0003] The process of producing direct reduced iron is called...

Claims

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Application Information

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IPC IPC(8): C21B13/02
CPCY02P10/143C21B13/02C21B13/0073
Inventor 吴道洪范志辉李志远邓君曹志成
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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