Method and system for preparing sponge iron by using gas-based shaft furnace
A gas-based shaft furnace and sponge iron technology, applied in the field of metallurgy, can solve the problems of low carbon monoxide content, difficulty in reaching the center of the shaft furnace for reducing gas, and large-scale reducing gas heating equipment.
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[0092] Example 1
[0093] Such as figure 2 with Figure 7 As shown, the fresh reducing gas is divided into two parts, one part passes through the gas hydrogen extraction device, and this part of the gas is divided into hydrogen and carbon monoxide rich gas, and the hydrogen and the other part of the fresh reducing gas are passed into the gas heating furnace for heating When the temperature reaches 900-1000 degrees Celsius, the surrounding pipe at the bottom of the shaft furnace reduction section enters the shaft furnace reduction section to undergo reduction reaction with the oxidized pellets entering from the upper part of the shaft furnace. The carbon monoxide-rich gas is passed into the bottom of the shaft furnace cooling section to exchange heat with the hot sponge iron, and the sponge iron is cooled to below 50°C in the shaft furnace cooling section, while carburizing reaction consumes a part of carbon monoxide. This part of the carbon monoxide-rich gas is heated to 850-900...
Example Embodiment
[0095] Example 2
[0096] Such as image 3 with Figure 8 As shown, the fresh reducing gas is introduced into the gas heating furnace to be heated to 900-1000 degrees Celsius, and then the surrounding pipe at the bottom of the shaft furnace reduction section enters the shaft furnace reduction section to undergo reduction reaction with the oxidized pellets entering from the upper part of the shaft furnace. The sponge iron is obtained and the furnace top gas is generated, and the sponge iron enters the cooling section, and the generated furnace top gas is discharged from the shaft furnace top gas outlet.
[0097] The exhausted furnace top gas is washed and cooled, compressed, and desulfurized and decarbonized to obtain unreacted reducing gas. The unreacted reducing gas is subjected to hydrogen extraction treatment to obtain hydrogen and carbon monoxide-rich gas, respectively, and combine the hydrogen with The fresh reducing gas is fed into the gas heating furnace for heating. The ca...
Example Embodiment
[0098] Example 3
[0099] Such as Figure 5 with Picture 9 As shown, the fresh reducing gas is divided into two parts, one part passes through the gas hydrogen extraction device, and this part of the gas is divided into hydrogen and carbon monoxide rich gas, and the hydrogen and the other part of the fresh reducing gas are passed into the gas heating furnace for heating When the temperature reaches 900-1000 degrees Celsius, the surrounding pipe at the bottom of the shaft furnace reduction section enters the shaft furnace reduction section to undergo reduction reaction with the oxidized pellets entering from the upper part of the shaft furnace. The carbon monoxide-rich gas is passed into the bottom of the shaft furnace cooling section to exchange heat with the hot sponge iron, and the sponge iron is cooled to below 50°C in the shaft furnace cooling section, while carburizing reaction consumes a part of carbon monoxide. This part of the carbon monoxide-rich gas is heated to 850-90...
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