Air Pollution Control of Blast Furnace Flue Gas
Due to the burning of fuels such as coal, oil and gas, flue gas will always be produced by industrial production, especially in the process of blast furnace smelting, resulting in large amounts of dust, sulfur dioxide and other pollutants in the discharge emissions. In order to reduce the pollution of flue gas, the methods of air pollution control of blast furnace flue gas should be adopted in combination with the specific conditions.
The most commonly used method of controlling air pollution caused by blast furnace flue gas is using a dust collector. Dust collectors are broadly categorized into two main types: mechanical dust collectors and fabric filters. Mechanical dust collectors use various methods, such as centrifugal force, inertial force and cyclone force, to capture and separate dust particles from the flue gas stream. Fabric filters use a fine mesh fabric bag that traps and collects the particles from the flue gas stream. Mechanical dust collectors are better suited for lower dust loading applications, while fabric filters are better suited for higher dust loading applications.
In addition to dust collectors, wet scrubbers can be used to reduce the amount of dust, sulfur dioxide and other pollutants in the flue gas. Wet scrubbers use a high-pressure liquid spray to capture and remove dust particles, as well as other toxic gases, from the flue gas. The liquid spray can be a water and/or a specialized chemical mixture, depending on the pollutant and the desired removal efficiency.
Another air pollution control method for blast furnace flue gas is the use of electrostatic precipitators (ESPs). ESPs use negatively and positively charged electrodes to attract and capture dust particles from the flue gas stream. The dust particles that are attracted to the electrodes are then removed from the stream by a variety of methods. ESPs are best suited for applications with high dust loading.
Finally, low-NOx burners can also be used to reduce the amount of nitrogen oxide emissions in blast furnace flue gas. Low-NOx burners are designed to minimize the amount of oxygen available for combustion, which in turn minimizes nitrogen oxide formation. Low-NOx burners also use a mixture of air and fuel to further reduce the amount of nitrogen oxide formed in the furnace.
In conclusion, air pollution control for blast furnace flue gas requires the combination of several methods in order to achieve optimal results. Dust collectors, wet scrubbers, electrostatic precipitators, and low-NOx burners, can all be used to reduce the amount of airborne pollutants caused by blast furnace smelting. When used in combination, these methods of control can make a significant difference in the overall air quality.
