Direct Reduction Shaft Control for Variable Hydrogen Gas Flow
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Solution Overview
Problem
Existing methods for producing sponge iron using hydrogen-rich reduction gas struggle with fluctuations in flow rate, leading to increased carbon dioxide emissions when natural gas is used for compensation, which is not environmentally friendly.
Innovation Solution
A method and arrangement that control the flow rates of iron ore and sponge iron production based on measured hydrogen-rich gas flow rates and composition, maintaining a constant level in the reduction shaft, and using methane gas to compensate for fluctuations without increasing carbon dioxide emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural gas is added to compensate for hydrogen flow rate fluctuations, then the flow rate stability is improved, but carbon dioxide emissions increase
Solution Approach 1:
The patent implements a feedback control system where the flow rate of hydrogen-rich reduction gas is continuously measured, and this measurement is used to adjust the iron ore feed rate and sponge iron extraction rate dynamically. This closed-loop feedback mechanism maintains production stability without requiring additional carbon-containing gases for compensation.
Solution Approach 2:
The patent changes the controlled parameters from fixed flow rates to dynamically adjusted rates based on actual hydrogen availability. By making the iron ore feed rate and sponge iron extraction rate variable parameters that respond to hydrogen flow rate measurements, the system adapts to fluctuations without needing compensatory carbon-containing gases.
2Productivity
If the flow rate of hydrogen-rich reduction gas is increased, then the productivity is improved, but the manufacturing precision of sponge iron quality deteriorates
Solution Approach 1:
The patent transforms the static, fixed flow rate operation into a dynamic system where the iron ore feed rate and sponge iron extraction rate are continuously adjusted based on real-time hydrogen flow rate measurements. This dynamic adaptation allows the system to operate at varying productivity levels while maintaining consistent sponge iron quality through proportional adjustments.
Solution Approach 2:
The feedback control system measures the actual hydrogen-rich reduction gas flow rate and uses this information to adjust the iron ore feed rate and sponge iron extraction rate accordingly. This ensures that the reduction process maintains optimal hydrogen-to-iron ore ratio regardless of the absolute flow rate, preserving product quality while enabling flexible productivity adjustment.
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
The method and arrangement stabilize sponge iron production by maintaining consistent flow rates and reducing carbon dioxide emissions, ensuring efficient and sustainable sponge iron production.
Implementation Method 1
heating the hydrogen-rich reduction gas to a predetermined temperature
Implementation Method 2
introducing the heated hydrogen-rich reduction gas into the direct reduction shaft in order to reduce the iron ore and produce sponge iron
Data Source
AI summary
An arrangement for producing sponge iron, including a direct reduction shaft, a device for charging iron ore into the direct reduction shaft, a device for extracting sponge iron from the direction reduction shaft, a hydrogen-rich reduction gas source, a reduction gas line extending from the hydrogen-rich reduction gas source to the direct reduction shaft, and a heater for heating the hydrogen-rich reduction gas in the reduction gas line. The arrangement further includes a flow rate meter configured to measure the flow rate of the hydrogen-rich reduction gas in the reduction gas line, and a control unit configured to control the device for charging iron ore into the direct reduction shaft and to control the device for extracting sponge iron from the direct reduction shaft based on input from the flow rate meter, such that the flow rate of the iron ore and the flow rate of the sponge iron are proportional to the measured flow rate of the hydrogen-rich reduction gas.