The Investigation of Combustion Acidic Gas Removal Efficiency by In-Duct Dry Sorbent Injection Technology

• Main Authors: SZU, HUNG TAO, 司洪濤
• Other Authors: YUAN, CHUNG SHIN
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/60135519768802008303

碩士 === 國立中山大學 === 環境工程研究所 === 84 === This study investigated the potential removal of acidic gases (SO2 and NO) from combustion waste gas by in duct dry sorbent injection. A laboratory-scale dry sorbent injection duct reactor was originally designed and constructed in this study. The experiments were conducted by the injection of hydraded lime (Ca(OH)2) and the humidification of flue gas with water spray at the downstream of dry sorbent injection port. The atomization of water into duct reactor is two fold. First, it elevates the rela humidity of waste gas to enhance gas-solid reaction rate. Second, the dry sorbent may collapses with water droplet to form an alkiline slurry droplet which acts as a spray drying process. The acidic gases were removal during the complex gas-solid and gas-liquid chemical reactions. Before the experiments were conducted, experimental apparatus were initially characterized by leakage and adiabatic tests. The main work of this study was to detect the acidic gas removal efficiency and sorbent conversion. The operation parameters investigated were stoichiometric ratio (SR), approach to adiabatic saturation temperature (AT) and inlet acidic gas concentration. Finally, the reaction product of in-duct dry sorbent injection was photographed by canning electron microscope (SEM) e it''s size and morphology. For the experiments conducted in the in-duct dry sorbent injection, the removal efficiencies of SO2 were 20%~57% and those of NO were 5%~9% at a stoichiometric ratio of 0.5~3.0 and an approach to saturation temperature of 10℃. In the simultaneous removal tests of SO2 and NO, the removal efficiency of SO2 was higher than that of SO2 single gas test, but NO removal efficiency was somewhat lower than that of NO single gas test. As the ratio of SO2 to NO concentration increases, the SO2 removal efficiency creases, and NO removal efficiency increases slightly. In addition, an irregular shape of product was observed by SEM in the dry sorbent injection.