High efficiency utilization of slaked lime for neutralization treatment of waste incineration exhaust gas

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K00577
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental engineering and reduction of environmental burden
• Research Institution: Hokkaido University
• Principal Investigator: Hwang In-Hee 北海道大学, 工学(系)研究科(研究院), 助教 (70447077)
• Co-Investigator(Kenkyū-buntansha): 松藤 敏彦 北海道大学, 工学研究院, 教授 (00165838)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 廃棄物焼却 / 排ガス処理 / 消石灰 / 塩化水素 / 塩化水酸化カルシウム / 中和反応

Outline of Final Research Achievements

Fly ashes discharged from incineration facilities which were performing dry scrubbing of acid gas using slaked lime and dust collection using a bag filter were analyzed. As a result, it was revealed that the reaction product of HCl and slaked lime was calcium chloride hydroxide (CaClOH), not generally known anhydrous or hydrous calcium chlorides (CaCl2). In the experiment under the condition of 170oC, and Ca/Cl molar ratio=0.1-5 using a lab scale of flow-through reactor, Ca(OH)2 and HCl reaction product was also CaClOH, which was consistent with the analysis result of fly ashes obtained from incineration facilities. Considering the efficient use of slaked lime, it was desirable to make the reaction proceed up to CaCl2 formation, but it was suggested that CaClOH might be formed as a main product the current dry scrubbing process of flue gas treatment.

Free Research Field

廃棄物処理工学