DL Sintering Machine Oxygen Enrichment for Ore Strength
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Solution Overview
Problem
Conventional methods for producing sintered ore in blast furnaces face challenges in achieving high strength and productivity due to limited oxygen enrichment positions and the use of gaseous fuels, which affect air permeability and increase costs.
Innovation Solution
Perform oxygen enrichment at specific timings and positions, including the middle and lower layers of the raw material charged layer in a sintering machine, closer to the ore discharging section, to enhance the overall strength of the sintered ore without using gaseous fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If oxygen enrichment is performed only at the ignition position (upper layer) of the raw material charged layer, then the combustion reaction in the upper layer is improved, but the overall strength of the sintered ore is not significantly increased
Solution Approach 1:
The patent applies oxygen enrichment to specific layers (middle and lower layers) of the raw material charged layer rather than uniformly across all layers. This localized approach addresses the specific need for heat compensation in these layers, which have insufficient heat input during sintering, thereby improving the overall strength of the sintered ore without unnecessarily increasing temperature in already adequate areas.
2Strength
If gaseous fuel is used to expand the combustion area and improve sintered ore strength, then the strength of sintered ore is improved, but air permeability deteriorates and productivity decreases
Solution Approach 1:
The patent uses oxygen-enriched air (containing 21-30% oxygen) instead of gaseous fuel to promote combustion in the middle and lower layers of the raw material charged layer. This approach provides the necessary heat for sintering while maintaining good air permeability, thus avoiding the productivity reduction associated with gaseous fuel usage while still improving sintered ore strength.
3Temperature
If gaseous fuel is used to create temperature conditions suitable for sintering, then the sintering reaction is improved, but the production cost increases
Solution Approach 1:
The patent replaces expensive gaseous fuel with oxygen-enriched air to provide the necessary temperature conditions for sintering in the middle and lower layers. This substitution maintains effective sintering reaction while significantly reducing production costs by eliminating the need for costly fuel additives.
4Object-affected harmful factors
If oxygen enrichment is performed in the lower layer part using exhaust gas recirculation, then the environmental load is reduced, but the sintering reaction effect is insufficient due to low oxygen concentration
Solution Approach 1:
The patent uses oxygen-enriched air with a controlled oxygen concentration of 21-30%, which is significantly higher than the oxygen concentration in recirculated exhaust gas. This provides sufficient oxygen to promote effective sintering reactions in the lower layer while still utilizing the exhaust gas recirculation concept to manage environmental load, thereby resolving the contradiction between environmental protection and sintering effectiveness.
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 significantly increases the strength of sintered ore while maintaining a high production rate, reducing powder generation during transportation and storage, and avoiding excessive heat supply issues.
Implementation Method 1
introducing gas into the raw material charged layer to thereby sequentially ignite the carbonaceous material in the raw material charged layer and thus sinter the mixed material
Implementation Method 2
perform oxygen enrichment from above the raw material charging layer on the sintering machine
Implementation Method 3
suck the gas resulting from the reaction of the above gases into the lower layer part of the raw material charged layer
Data Source
AI summary
A method produces a high-strength sintered ore while maintaining a high production rate by performing appropriate oxygen enrichment at a position closer to an ore discharging section than an ignition position without using gaseous fuel in the operation of a sintering machine. In a method for producing sintered ore including sequentially combusting carbonaceous material in a sinter bed (raw material charged layer) in a DL sintering machine to sinter the mixed raw material, in performing oxygen enrichment from above the raw material charging layer on the sintering machine, the oxygen enrichment is performed at a position closer to the ore discharging section than the position where 4 minutes have passed since the upper surface of the charging layer was ignited