Y-Type Entrained Flow Bed for Coke-Free Iron Smelting
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Solution Overview
Problem
The traditional shaft furnace iron smelting process is limited by high investment costs, long flow processes, and environmental pollution due to its dependence on coke, which is scarce and unevenly distributed, necessitating an improved non-coke iron smelting method.
Innovation Solution
A classified reduction gasification iron smelting process using a Y-type entrained flow bed, where iron ore powder and coal powder are mixed and sprayed with a gasification agent and water vapor at high temperatures to produce crude syngas and slag, eliminating the need for coke and pelletizing, and optimizing the reaction zone for efficient reduction and slag formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional shaft furnace iron smelting process is used, then iron production can be achieved, but investment cost increases and flow process lengthens
Solution Approach 1:
The shaft furnace is divided into multiple segments (reduction zone, melting zone, slag separation zone) with different functions. Each segment operates at different temperatures and performs specific tasks, allowing the overall process to be optimized independently in each zone while maintaining high productivity and reducing total process length
Solution Approach 2:
The process transitions from traditional two-dimensional horizontal flow to three-dimensional vertical stratified flow. Materials move vertically through different temperature zones simultaneously, achieving multiple reactions in parallel spatial layers, which shortens the overall flow process while maintaining high production efficiency
2Productivity
If coke is used in traditional iron smelting, then reduction reaction can be achieved, but environmental pollution increases and resource consumption increases
Solution Approach 1:
The process changes the chemical composition parameters of the reducing agent from coke-based to coal powder-based mixture with specific ratios. This parameter change eliminates the formation of harmful byproducts like benzopyrene and dioxins while maintaining effective reduction capability through optimized coal powder characteristics and mixture composition
Solution Approach 2:
The process converts what would normally be waste gases into useful reducing agents. Coal powder combustion products and injected gases are utilized as reducing atmospheres, turning potential pollutants into beneficial components that drive the reduction reaction while minimizing harmful emissions
3Reliability
If high-quality coking coal is used, then metallurgical coke can be produced, but resource scarcity increases and distribution becomes uneven
Solution Approach 1:
The process makes coal powder serve multiple functions simultaneously: as a reducing agent, as a fuel source, and as a carbon provider. This multi-functionality eliminates the need for specialized coking coal, allowing ordinary coal resources to be used effectively, thereby improving resource availability and distribution flexibility while maintaining process reliability
Solution Approach 2:
The process extracts and eliminates the coking step from the traditional flow. By directly using coal powder in pulverized form without requiring it to be converted into coke first, the process removes the constraint of needing scarce coking coal resources while maintaining all necessary functions that coke would provide
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 process reduces production costs and energy consumption, enhances operational flexibility, and eliminates pollutant discharge, enabling large-scale, low-cost, and environmentally friendly iron production by directly utilizing iron ore and coal powder.
Implementation Method 1
performing combustion and gasification at a temperature of 1,500-1,800° C. to produce crude syngas and slag
Implementation Method 2
performing combustion and gasification at a temperature of 1,500-1,800° C. to produce crude syngas and slag
Implementation Method 3
suck the raw material iron ore powder into a riser to perform preheating, drying and partial reduction by the crude syngas
Implementation Method 4
suck the raw material iron ore powder into a riser to perform preheating, drying and partial reduction
Implementation Method 5
the residual ash is solidified on the water-cooled wall of the gasification segment to form a slag layer
Implementation Method 6
the unreacted iron ore powder and coal powder in the slag are further subjected to a reduction reaction in the slag-iron separation segment to obtain molten iron and CO
Data Source
AI summary
A classified reduction gasification iron smelting process of iron ore powder and coal powder in a Y-type entrained flow bed. The process comprises the following steps: uniformly mixing the pre-reduced hot iron ore powder with the coal powder, and introducing the mixture, a gasification agent and water vapor into a Y-type entrained flow bed for performing combustion, gasification and reduction reaction to obtain crude syngas and molten iron; the crude syngas is used for sucking iron ore powder to enter a riser to perform preheating and partial reduction.