Points to note for desulfurization using soda ash (sodium carbonate)
Thread Content
Dear colleagues: Our company previously used NaOH (30%) for flue gas desulfurization, and the operation was quite stable； Recently, several tons of soda ash (sodium carbonate) were used to prepare a 4% aqueous solution, which was then added to the caustic tank for desulfurization. After using it for a few days, it was observed that the resistance of the desulfurization wire mesh mist eliminator increased. I would appreciate any advice on what might be causing this issue. (During the operation, both the pH and the density of the circulating fluid are kept under normal control.)
This post was last edited by mkp369 on 2018-3-8 at 15:00. The two absorbents are not the same thing, and the equipment should not be the same either. The generated CO2 dissolves in water.
Lift it up and find out the reason. Could it be that the carbon dioxide produced by the reaction is causing an increase in the pressure of the smoke gas?
This post was last edited by wang_LWUH on 2018-3-13 at 17:04. 1. Na2CO3 + H2S ------- NaHS + NaHCO3; Na2CO3 + SO2 = Na2SO3 + CO2; NaHS + O2 -------- Na2S2O3; Na2S2O3 + O2 ------- Na2SO4 + S. 2. NaOH + H2S -------- Na2S + H2O; NaOH + SO2 -------- Na2SO3 + H2O; Na2S + O2 ---------- Na2SO4. The main issue is that sulfur particles are generated during the absorption and conversion process using soda ash, which leads to blockages in the desulfurization wire mesh mist eliminators. Or the escape of carbon dioxide causes an increase in the gas volume passing through the tower, thereby accelerating the gas velocity.