Agglomeration of ultra-fine particles from flue gas in coal-fired power plant using polymeric flocculants

摘要

The flocculation or agglomeration of ultra-fine particles from flue gas in coal-fired power plant induced by various polymeric flocculants, polyacrylamides (PAM) in particular, was studied using jar tests. Various influencing factors were investigated, including different type, molecular weight and charge density of polyacrylamides. Results showed that cationic polyacrylamides (CPAM) performed better than anionic and nonionic PAM; whereas cationic PAM with a high molecular weight and charge density exhibited best flocculation performance. Specifically, when CPAM was added at 3 ppm to 0.2% w/w of ultra-fine suspension, the turbidity of the suspension was successfully lowered by 99.1%; and the average size of agglomerated ultra-fine particles was increased up to 80 times.