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
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[0083] Example 1
[0084] Such as Figure 1-2 As shown, the process for smelting direct reduced iron using pyrolysis oil and gas in the present invention is as follows:
[0085] Iron ore trend: the iron ore concentrate with 67% iron grade is transported to the receiving hopper 40, after passing through the slender loading leg 50 with a length of 6m and a diameter of 0.4m, it enters the preheating bin 60 and in the preheating bin 60 The iron ore is preheated to 200°C and then put into the gas-based shaft furnace 30;
[0086] Reducing gas trend: high-temperature pyrolysis oil and gas produced by pyrolysis of lignite in pyrolysis furnace 10 (tar content 20g / Nm3), heated by reheating furnace 20 to increase the temperature to 930°C, and then fed into gas-based shaft furnace 30 as reducing gas Iron ore is reduced in countercurrent upwards to form 500°C furnace top gas and obtain direct reduced iron products. The 500°C furnace top gas is discharged from the top of the gas-based shaft furn...
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[0089] Example 2
[0090] Such as Figure 1-2 As shown, the process for smelting direct reduced iron using pyrolysis oil and gas in the present invention is as follows:
[0091] Iron ore trend: the iron ore concentrate with 57% iron grade is transported to the receiving hopper 40, after passing through the slender loading leg 50 with a length of 6m and a diameter of 0.4m, it enters the preheating bin 60 and in the preheating bin 60 The iron ore is preheated to 350°C and then put into the gas-based shaft furnace 30;
[0092] Reducing gas trend: high-temperature pyrolysis oil and gas produced by pyrolysis of lignite in pyrolysis furnace 10 (tar content 100g / Nm3), heated by the reheating furnace 20 to increase the temperature to 980℃, and then fed into the gas-based shaft furnace 30 as reducing gas Countercurrent reduction of iron ore upwards to form 600°C furnace top gas and obtain direct reduced iron products. 600°C furnace top gas is discharged from the top of the gas-based shaft f...
Example Embodiment
[0095] Example 3
[0096] Such as Figure 1-2 As shown, the process for smelting direct reduced iron using pyrolysis oil and gas in the present invention is as follows:
[0097] Iron ore trend: the iron ore concentrate with 50% iron grade is transported to the receiving hopper 40, after passing through the slender loading leg 50 with a length of 4m and a diameter of 0.5m, it enters the preheating bin 60, and in the preheating bin 60 The iron ore is preheated to 300℃ and put into the gas-based shaft furnace 30;
[0098] Reducing gas trend: high-temperature pyrolysis oil and gas produced by pyrolysis of lignite in pyrolysis furnace 10 (tar content 80g / Nm3), heated by the reheating furnace 20 to increase the temperature to 1000 ℃, and then passed into the gas-based shaft furnace 30 as reducing gas Countercurrent reduction of iron ore upwards to form 700°C furnace top gas and obtain direct reduced iron products. 700°C furnace top gas is discharged from the top of the gas-based shaft fu...
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