Steelmaking Charge Composition for Lower Carbon Emissions
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Solution Overview
Problem
The steelmaking process emits significant amounts of carbon dioxide, posing a challenge in reducing greenhouse gas emissions.
Innovation Solution
A method involving the production of pig iron in a blast furnace, first molten steel in an electric arc furnace, and mixing with steel scrap in a converter to optimize carbon dioxide emissions, defined by specific mass ratios and emission coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pig iron is used as the main raw material in the converter process, then the steelmaking process is simple and efficient, but carbon dioxide emissions increase significantly
Solution Approach 1:
The patent changes the compositional parameters of the converter charge by incorporating electric arc furnace molten steel and steel scrap alongside pig iron. This parameter change reduces the proportion of high-emission pig iron while maintaining steelmaking efficiency, achieving lower carbon dioxide emissions without sacrificing productivity
Solution Approach 2:
The patent creates a composite raw material system for the converter by combining three different materials: pig iron, electric arc furnace molten steel, and steel scrap. This composite approach allows the benefits of each material to complement each other, reducing overall emissions while maintaining production efficiency
2Object-generated harmful factors
If electric arc furnace process is used to melt steel scrap, then carbon dioxide emissions are reduced, but the production cost increases due to higher energy consumption
Solution Approach 1:
The patent merges the blast furnace process and electric arc furnace process by using the electric arc furnace molten steel as a charge material in the converter. This integration allows the system to benefit from both processes: the low emission advantage of electric arc furnaces and the efficiency of the converter process, while reducing overall energy consumption compared to using electric arc furnaces alone
3Speed
If the proportion of pig iron in the converter charge is increased, then the steelmaking speed increases, but the carbon dioxide emissions per ton of steel increase
Solution Approach 1:
The patent optimizes the compositional parameters of the converter charge by controlling the proportions of pig iron, electric arc furnace molten steel, and steel scrap. This parameter optimization maintains steelmaking speed while reducing the carbon dioxide emission intensity per ton of steel produced
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces carbon dioxide emissions during steel production by minimizing the use of high-emission pig iron and optimizing the mixing ratios of raw materials, achieving emissions of less than 1.7 tons per ton of molten steel.
Implementation Method 1
producing pig iron by inputting a first raw material into a blast furnace
Implementation Method 2
producing a first molten steel by inputting a second raw material into an electric arc furnace
Implementation Method 3
producing a second molten steel by inputting the pig iron, the first molten steel, and steel scrap into a converter
Data Source
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AI summary
A steelmaking method according to an embodiment of the present invention comprises the steps of: introducing a first raw material into a blast furnace to produce pig iron; introducing a second raw material into an electric arc furnace to produce a first molten steel; and introducing the pig iron, the first molten steel, and steel scraps into a converter to produce a second molten steel. The amount (K) of carbon dioxide emitted during the production of one ton of the second molten steel is defined by Expression 1 below. The amount (K) of carbon dioxide emitted during the production of one ton of the second molten steel satisfies Expression 2 below. The amount (K) of carbon dioxide emitted during the production of one ton of the second molten steel = α × X + β × Y + γ × Z The amount (K) of carbon dioxide emitted during the production of one ton of the second molten steel < α