The issue of sulfur dioxide levels meeting standards when starting up the sulfuric acid plant
Thread Content
After the shutdown for maintenance and upon restarting the furnace, the conversion rate of sulfur dioxide is low due to the low temperature of the converter; it takes some time for either low-concentration or high-concentration sulfur dioxide to increase in temperature. This process results in excessive levels of sulfur dioxide in the exhaust gases. Alkaline solutions are currently used for absorption. Are there any relevant literature articles or methods that can provide better solutions for controlling sulfur dioxide levels during this temperature-raising process?
Is there no electric heating furnace to raise the temperature before introducing furnace gas into the converter?
The temperature rises, but at the time the furnace is started, the temperature of the converter does not reach the conversion point; it takes some time for sulfur dioxide to contribute to the increase in temperature, and during this period the level of sulfur dioxide will be too high
By using a one-turn-one-suction process in combination with ionic liquids, standards are always met, ensuring energy efficiency and environmental protection
Currently, the sulfuric acid production process uses two rotations and two absorptions; it seems that this cannot be changed at the moment. Can ion liquids help to maintain the required standards under such conditions? Are there any solutions at the source?
It’s easy to modify, thanks to the buffering capacity of ionic liquids
This process can easily reach saturation, right? Can the ion absorption solution absorb high concentrations of sulfur dioxide?
Strictly control the inlet temperatures at section 1 and section 4 to ensure they remain above the ignition point. When first starting the vehicle, try to keep the load as low as possible (ensuring that the furnace does not emit smoke). The gas concentration is low; as the conversion temperature improves, the load can be increased as appropriate.
I have a general understanding of this; are there any relevant examples or materials?
Increase the power of the electric furnace; slightly raise the temperature at the inlet of stage 1 before starting the air supply. Strictly control the temperatures at the inlets of stages 1 and 4. Do not shut down stage 1 too early, and try to use the temperature of stage 1 to raise the temperature of stage 2