On-site Hydrogen Production for Direct Reduced Iron
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Solution Overview
Problem
Current hydrogen production methods for the steel industry are costly and environmentally impactful, necessitating the development of sustainable and competitive alternatives.
Innovation Solution
A hydrogen direct reduction plant is integrated within an industrial site, utilizing existing energy carriers like steam and CO-bearing gases to produce hydrogen through electrolysis and gas shift reactor processes, reducing reliance on external hydrogen sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If steam reforming of natural gas is used to produce hydrogen, then hydrogen production cost is reduced and economic attractiveness is improved, but CO2 emissions increase and environmental sustainability deteriorates
Solution Approach 1:
The patent converts CO2, a harmful emission from natural gas reforming, into a useful resource by feeding it to the gas shift reactor where it reacts with hydrogen to produce more hydrogen and water. This transforms the harmful CO2 byproduct into a valuable feedstock for additional hydrogen production, simultaneously reducing emissions and lowering production costs.
Solution Approach 2:
The patent merges the steam reforming process with a gas shift reactor system to create an integrated hydrogen production facility. The reforming unit and gas shift reactor are combined in series, allowing the output of one process to directly feed the other, creating a coupled system that improves overall efficiency and sustainability.
2Object-generated harmful factors
If water-based electrolysis units are used to produce hydrogen, then CO2 emissions are reduced and environmental sustainability is improved, but capital expenditure and operational expenditure increase
Solution Approach 1:
The patent introduces a gas shift reactor as an intermediary process between the reforming unit and the electrolysis unit. This intermediary system allows CO2 from the reforming process to be converted into additional hydrogen, which then supplements the hydrogen produced by electrolysis, reducing the overall need for expensive electrolysis capacity while maintaining low emissions.
Solution Approach 2:
The gas shift reactor serves multiple functions: it converts CO2 into additional hydrogen, it acts as a buffer between the reforming and electrolysis units, and it enables the system to operate flexibly by adjusting the split between thermal (reforming) and electrical (electrolysis) hydrogen production pathways.
3Ease of manufacture
If steam-fed electrolysis units are used to produce hydrogen, then operational expenditure is reduced compared to water-based electrolysis, but capital expenditure remains high
Solution Approach 1:
The patent creates a dynamic hydrogen production system where the split between steam reforming and electrolysis can be adjusted based on operational conditions, feedstock availability, and market demands. The gas shift reactor provides flexibility to optimize the balance between low-cost thermal hydrogen and clean electrical hydrogen, allowing operational optimization while managing capital investment.
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 significantly reduces hydrogen production costs and environmental footprint by leveraging on-site energy sources, enhancing operational and capital expenditures efficiency while minimizing CO2 emissions.
Implementation Method 1
electrolysis means configured to produce hydrogen from steam recovered from one or more components of the industrial plant and/or from steam generated using waste heat and/or hot gases emitted by the one or more components
Implementation Method 2
gas shift reactor means configured to convert the CO-bearing gas emitted by at least one component of the industrial plant into a hydrogen-rich gas
Implementation Method 3
heating it in a heater device
Data Source
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AI summary
The invention relates to the production of direct reduced iron, DRI, where a hydrogen direct reduction is synergistically operated in the context of an industrial plant. The hydrogen reduction operates with reducing gas comprising at least 85 vol.% hydrogen, and receives a make-up hydrogen stream. At least part of the make-up hydrogen stream is produced on site. by at least one of (i) electrolysis means configured to produce hydrogen from steam recovered from one or more components of the industrial plant and/or from steam generated using waste heat and/or hot gases emitted by the one or more components; and (ii) gas shift reactor means configured to convert CO-bearing gas emitted by at least one component of the industrial plant into hydrogen and to remove CO2.