Wet flue gas desulfurization was simulated to improve gypsum production using low-grade limestone. High-grade limestone with 94 wt% CaCO3 content is used for producing gypsum with 93 wt% purity, but owing to the resource depletion of high-grade limestone, low-grade limestone should be replaced as an alternative. However, low-grade limestone with CaCO3 purity of less than 94% contains impurities such as MgCO3, Al2O3, and SiO2, which reduce gypsum purity. To resolve this issue, a process involving mixing of both low-grade and high-grade limestone was simulated to predict the quantity of low-grade limestone that could be utilized. Many reactions like limestone dissolution, SOX absorption, and crystallization were considered and were simulated by different models in Aspen plus. For process optimization, the following constraints were set: 93 wt% gypsum purity, 94% desulfurization efficiency, and 3,710 kg/h total limestone usage, which maximized the mass flow of low-grade limestone. The maximum blending quantity of low-grade limestone for 2,100 kg high-grade limestone that satisfied the constraints was ∼1,610 kg.
|Number of pages||9|
|Journal||Korean Journal of Chemical Engineering|
|Publication status||Published - 2020 Dec|
Bibliographical noteFunding Information:
This study has been conducted with the support of the Korea Institute of Industrial Technology as “Development of Gas-phase pollutant removal technology using low temperature de-NOx catalyst and low energy-consuming CO2 absorbent based on quantum mechanics simulation (kitech EO-19-0011)” and “Development of AI Platform Technology for Smart Chemical Process (kitech JH-20-0005)”.
© 2020, The Korean Institute of Chemical Engineers.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)