Sintering Gas Medium Composition for Emission Reduction
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Solution Overview
Problem
Conventional sintering processes in the steel industry face high energy consumption and pollution challenges, with limitations in reducing solid fuel consumption and pollutant emissions, particularly CO2, NOx, SOx, and dioxin, due to inefficient energy use and combustion processes.
Innovation Solution
A method involving the use of energy-carrying composite gas mediums with varying compositions and temperatures is introduced to different sections of a sintering machine, replacing conventional air to optimize energy consumption and emission reduction, by dividing the sintered material surface into sections with specific gas requirements and injecting appropriate gases such as hot exhaust gas, hydrogen-rich gas, and water vapor to enhance combustion efficiency and reduce pollutant production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If solid fossil fuels (coke and anthracite) are used as heat sources in conventional sintering, then high energy consumption is achieved, but high pollution emission (CO2, SOx, NOx) and incomplete combustion waste occur
Solution Approach 1:
The patent changes the physical and chemical parameters of the gas medium by controlling the proportion of oxygen, carbon dioxide, and water vapor to optimize combustion efficiency and reduce pollutant emissions while maintaining energy consumption levels
Solution Approach 2:
The patent uses a composite gas medium consisting of multiple components (oxygen, carbon dioxide, water vapor) rather than a single gas, where each component serves a specific function in the combustion process to achieve both energy efficiency and emission reduction
2Object-generated harmful factors
If water vapor is injected at high concentration in the middle section to improve combustion efficiency, then CO emission is reduced, but red-hot layer and sintered ore belt are adversely affected when injection position is close to front or rear
Solution Approach 1:
The patent applies different gas compositions and concentrations to different sections of the sintering machine based on local heat requirements and combustion characteristics, ensuring optimal conditions for both combustion efficiency and sintering quality in each zone
Solution Approach 2:
The patent divides the sintering process into multiple sections (ignition section, heat preservation section, middle section, flue gas heating section, machine tail section) with different gas injection strategies to balance combustion improvement with quality maintenance
3Object-generated harmful factors
If flue gas circulation is implemented to reduce pollutant emission, then CO and NOx are reduced, but high-temperature flue gas enters the material layer bringing excessive heat and affecting sintering process and ore quality
Solution Approach 1:
The patent modifies the temperature and composition parameters of the circulating flue gas by selective cooling and mixing with cold air or water vapor before re-introduction, reducing excessive heat while maintaining pollutant reduction benefits
Solution Approach 2:
The patent introduces cold air or water vapor as intermediary substances to dilute and cool the hot flue gas before it contacts the material layer, acting as a thermal buffer that prevents excessive heating while allowing pollutant reduction
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 reduces CO2, CO, NOx, SOx, and dioxin emissions by 15-25%, 40-50%, 20-40%, 5-20%, and 50-80% respectively, achieving significant energy conservation and emission reduction while maintaining sintering quality.
Implementation Method 1
introducing energy-carrying composite gas mediums with different compositions and heats to a surface of a sintered material of different sections... to replace conventional air for sintering
Implementation Method 2
injecting appropriate gases such as hot exhaust gas, hydrogen-rich gas, and water vapor to enhance combustion efficiency and reduce pollutant production
Implementation Method 3
hydrogen-rich gas... to enhance combustion efficiency
Data Source
AI summary
A cooperative emission reduction method for sintering using an energy-carrying composite gas is disclosed. A surface of a sintered material is divided into an ignition section, a heat preservation section, a middle section, a flue gas heating section, and a machine tail section from a machine head to a machine tail of a sintering machine; according to flue gas components, temperature characteristics, and heat requirements of different sections, a hot exhaust gas is introduced to the ignition section for ignition, a hot exhaust gas is introduced to the heat preservation section and a hydrogen-rich gas is cascadingly sprayed synchronously, cascaded spraying of water vapor is coupled based on spraying of a hydrogen-rich gas in the middle section, and the high-temperature flue gas in the machine tail section and the flue gas in the ignition section and/or the heat preservation section are circulated to the heating section.