Steel Plant Converter Gas to Methanol Integration
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Solution Overview
Problem
The challenge in steel production is to improve the efficiency of the process while reducing CO2 emissions, particularly in conventional blast furnace routes and emerging green transformation methods like direct reduction and electrosteel routes.
Innovation Solution
A steel production process is optimized within a plant network that includes a converter for refining iron melts from either a blast furnace or a direct reduction reactor. The process generates synthesis gas from converter gases, which is enriched with hydrogen to produce methanol. Additionally, organically coated steel scrap is introduced into the converter process to enhance carbon utilization and reduce emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If converter gas is used for energy purposes in conventional steel production, then energy efficiency is improved, but CO2 emissions are not sufficiently reduced and carbon is not effectively recycled
Solution Approach 1:
The invention converts the harmful CO-rich converter gas, which would otherwise be emitted or used merely for energy, into a valuable resource by processing it into synthesis gas and then into methanol. This transforms a waste product containing carbon into a useful chemical raw material, simultaneously reducing emissions and creating economic value.
Solution Approach 2:
The invention recovers carbon from the converter gas that would otherwise be discarded. By processing the converter gas through a synthesis gas unit and methanol synthesis unit, the carbon contained in the CO is captured and converted into methanol, preventing its release into the atmosphere and enabling its reuse as a chemical raw material.
2Object-generated harmful factors
If direct reduction and subsequent melting is used for steel production, then green transformation is achieved, but process efficiency needs improvement
Solution Approach 1:
The invention makes the converter gas processing system multi-functional: it serves both as a method to reduce CO2 emissions and as a means to improve process efficiency. The same system that converts harmful gas into methanol also provides coordinated process control and optimizes the overall steel production efficiency by integrating multiple functions into a unified process flow.
Solution Approach 2:
The invention implements feedback by using the methanol production process to inform and optimize the overall steel production process. The coordinated control system monitors and adjusts process parameters based on the interaction between steel production and methanol synthesis, creating a closed-loop system that continuously improves efficiency.
3Object-generated harmful factors
If converter gas is processed into synthesis gas and methanol, then CO recycling is improved, but plant network complexity increases
Solution Approach 1:
The invention merges the steel production process with the methanol production process by integrating the converter gas processing, synthesis gas generation, and methanol synthesis into a unified plant network. This combination allows the system to handle multiple functions through integrated units rather than separate standalone systems.
Solution Approach 2:
The converter gas processing system is designed with multi-functionality, serving both the steel production process and the methanol synthesis process. The same infrastructure and processing units are used to achieve both steelmaking and chemical production, reducing the need for separate dedicated systems.
4Loss of substance
If organically coated steel scrap is added to the converter, then carbon utilization is enhanced, but the coordination of process steps becomes more challenging
Solution Approach 1:
The coordinated control system implements feedback mechanisms that monitor the addition of organically coated steel scrap and adjust subsequent process steps accordingly. This ensures that the carbon from the organic coatings is effectively utilized in the converter gas and subsequently in the methanol synthesis, while maintaining optimal process conditions throughout the integrated system.
Solution Approach 2:
The system performs preliminary actions by pre-coordinating the addition of organically coated steel scrap with the subsequent gas processing and methanol synthesis steps. The control system prepares and adjusts process parameters in advance to ensure optimal carbon utilization and seamless coordination between different process stages.
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
This approach enables the efficient production of methanol from steel production gases, promoting a circular economy by reusing organic coatings and minimizing CO2 emissions. The process improves the coordination of steel production steps, leveraging existing plant infrastructure and enhancing carbon material use.
Implementation Method 1
a synthesis gas is generated upstream of the chemical plant or within the chemical plant based on the converter gas or a portion of the converter gas... the subsequent product methanol CH3OH is produced from the synthesis gas or with the enriched synthesis gas
Implementation Method 2
organically coated steel scrap is introduced into the converter process to enhance carbon utilization and reduce emissions
Data Source
Figure 1
AI summary
The invention relates to a process for steel production in a plant complex (1), wherein the plant complex (1) comprises: - a direct reduction reactor (2) or a blast furnace, - optionally an electric arc furnace (3), - a converter (4), - a gas piping system (5, 5', 5"), - optionally a processing unit (6), and - a chemical plant (7). The converter process is carried out with the addition of organically coated steel scrap. Synthesis gas is produced from the converter gas or a portion thereof and is preferably enriched with H₂. In the chemical plant, methanol (CH₃OH) is produced from the synthesis gas or the enriched synthesis gas. This can be further processed, for example in a paint factory (8), into an organic coating material.