How to calculate the amount of alkali required for flue gas desulfurization based on the sulfur content in the raw materials?
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As the title suggests, I have a flue gas desulfurization system of the wet type, which uses sodium hydroxide for absorption. I currently have the following data: for a catalytic cracking unit, I know the processing volume, the sulfur content in the feedstock, the coking rate, and the main air flow rate. The flue gas desulfurization process employs a 32% NaOH solution for absorption, and it can be assumed that complete absorption occurs. How can I calculate the amount of alkali required based on the sulfur content in the feedstock?
It’s not easy to determine it based on the sulfur content in the raw materials; it’s necessary to analyze the distribution of sulfur in the catalyst, measure the sulfur content in various products, and make estimates based on the sulfur content in the flue gas. However, flue gas flow meters are generally inaccurate
10-60% of the sulfur in the catalyst material ends up in the flue gases; the range of 10-60% is too wide to allow for an accurate calculation of the amount of alkali required.
If it’s Berg’s process, the amount of alkali used can be adjusted directly based on the pH value. However, I think a concentration of 32% for the alkali solution is a bit high; high concentrations of alkali can lead to alkali embrittlement, and they also make it more difficult to control the pH value
［(Processing amount × Sulfur content) ÷ 32］×2×40