Effect of pH on Absorption Efficiency From the above equation, the higher pH value means that the limestone concentration in the slurry is high, which is beneficial to the absorption of SO2. In order to ensure a higher SO2 absorption rate, a higher pH value must be ensured. The pH value in the absorption tower is supplemented by continuous addition of limestone slurry, but not the higher the pH, the better. A high pH slurry favors the absorption of SO2, while a low pH favors the precipitation of the product. The two are opposed to each other. Within a certain range, as the pH of absorption tower slurry increases, the desulfurization efficiency tends to increase. Because high pH value means that there is more CaCO3 in the slurry, it is certainly beneficial to desulfurization. However, after pH > 5.8, the desulfurization efficiency will not continue to rise, but will instead decrease, as the precipitation of the product becomes more and more difficult with the decrease of the H+ concentration. However, when pH = 5.9, the CaCO3 content in the slurry reached 2.98%, while the CaSO4?2H2O content was also less than 90%. Obviously, the reaction between SO2 and the desulfurization agent was not complete at this time, which was both a waste of limestone and reduced the quality of gypsum. When the pH drops again, the content of CaSO4 ? 2H2O rises again and CaCO3 decreases. Therefore, the pH value of the slurry can neither be too high nor too low. Under normal circumstances, controlling the pH of the absorption tower at 5.4~5.5 can keep the Ca/S (amount of material) of the desulfurization reaction at 1.02 or so and obtain a better desulfurization. effect. Gasoline Gensets,Silent Gasoline Gensets,Homemade Electrical Generator,High Pitch Sound Generator Wuxi Doton Power , https://www.dotonpower.com
It can be seen that the control of pH value is very important for wet flue gas desulfurization. The pH value directly affects the desulfurization rate and the purity of the product. The choice of the pH electrode is the key to the problem.
January 06, 2023