Fluidized Bed Iron Ore Reduction via Low-Pressure Series-Parallel Configuration
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Solution Overview
Problem
Existing fluidized bed processes for reducing iron ore face challenges with high operational pressure and low reduction efficiency, leading to high energy consumption and economic inefficiencies.
Innovation Solution
A system comprising a series of fluidized beds with a bubbling fluidized bed and circulating fluidized beds in series-parallel configuration, where powdery iron ore passes through multiple stages for reduction, and preheated coal gas is used in parallel mode to enhance reduction efficiency, operating at low pressure to reduce reactor size and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fluidized bed processes operate at high pressure to maintain reactor size, then reactor volume is reduced, but energy consumption increases and reduction efficiency decreases
Solution Approach 1:
The patent changes the operating pressure parameter from conventional high pressure to low pressure (0.1-1.0 MPa), which fundamentally alters the process characteristics. This parameter change enables the system to achieve high reduction efficiency while maintaining low energy consumption, as the low pressure operation reduces compression energy requirements while the fluidized bed configuration compensates for the reduced driving force through enhanced gas-solid contact efficiency.
2Volume of stationary object
If high pressure is used in fluidized bed reduction, then reactor size can be reduced, but operational costs and energy consumption increase
Solution Approach 1:
The patent applies parameter change by operating at low pressure (0.1-1.0 MPa) instead of high pressure, which reduces energy loss associated with gas compression and circulation. The reactor size is managed through optimized fluidized bed configuration and gas distribution rather than relying on high pressure to maintain compact dimensions.
3Productivity
If single-stage fluidized bed is used, then device complexity is reduced, but reduction efficiency and metallization ratio are insufficient
Solution Approach 1:
The patent divides the reduction process into multiple stages with different fluidized bed configurations (bubbling bed, circulating bed, CFB-IFB combined bed). Each stage is optimized for specific reduction tasks, enabling the system to achieve high metallization ratios (>90%) and efficient reduction rates that cannot be achieved in a single stage.
Solution Approach 2:
The patent creates a multi-functional reduction system where different fluidized bed configurations serve complementary functions: bubbling beds for initial reduction, circulating beds for high-temperature reduction, and CFB-IFB combined beds for final metallization. This multi-functional configuration enables a single integrated system to perform multiple reduction functions that would otherwise require separate processes.
4Ease of manufacture
If conventional reduction processes are used, then process simplicity is maintained, but economic efficiency and scalability to large-scale production are limited
Solution Approach 1:
The patent segments the reduction process into modular stages that can be independently optimized and scaled. Each stage uses a specific fluidized bed configuration tailored to particular reduction requirements, enabling the system to achieve high economic efficiency through optimized resource utilization and scalability through modular expansion of individual 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
The system achieves high reducing efficiency and low energy consumption, enabling large-scale industrial production with improved economic efficiency by optimizing the fluidized bed configuration and gas operation mode.
Implementation Method 1
Both direct reduction and melting reduction need to undergo a gas-solid phase reduction process of the iron ore concentrate
Implementation Method 2
The fluidized bed reduction reactor is recognized as the most efficient iron ore reduction reactor due to its prominent advantages including direct processing of powdered ore, good heat and mass transfer, high reduction efficiency
Implementation Method 3
good heat and mass transfer
Data Source
AI summary
A system for fluidized bed reduction of powdered iron ore. Use of high-gas-velocity processing accelerates iron ore reduction speed and greatly improves the gas-treatment capabilities of a unit-cross-sectional fluidized bed. Use of parallel connections involving reduced coal gas lessens the volume of gas passing through a single-stage fluidized bed. Use of serial/parallel-connection processing involving reduced coal gas increases the coal gas utilization rate. The invention achieves the highly-effective reduction of powdered iron ore in a fluidized bed under near-atmospheric pressure. A reduction method based on the present system is also disclosed.