Host: Japan Society of Material Cycles and Waste Management
Name : The 31st Annual Conference of Japan Society of Material Cycles and Waste Management
Number : 31
Location : [in Japanese]
Date : September 16, 2020 - September 18, 2020
Chlorine in waste combustion has been studied in the fields of HCl generation, metal chlorides formation, and synthesis of organic chlorinated compounds, i.e. dioxins. Those chemical reactions are likely governed by reactive Cl2; however, Cl2 occurence in flue gas had hardly been reported, because of the difficulty of Cl2 quantification. An new practical method to determine HCl and Cl2 separately was proposed. Based on US EPA Method 26A which collected HCl in a acidic solution and Cl2 in alkaline solution, the new method empolyed a wet coiled tube for acidic HCl trapping; afterwards, Cl2 was reduced with H2O2 solution in a large vessel. The large volume brought a prolonge retention time(several decades seconds) for reaction of Cl2 dissolution and reduction; moreover, both gas and mist after Cl2 trapping are colleted in glass fiber filter. HCl was completely partitioned to the wet coiled tube without leaking to the vessel. 10% of Cl2 was captured at the coiled tube and the rest was evenly partitioned to vessel and filter. The results suggests Cl2 collection needs a certain prolonged retention time; in addition, the mist involves considerable chloride ion generated from Cl2.
