Abstract
Removal of nitrogen oxides (NO_x) from flue gas emitted from large-scale ships is desirable for environmental pollution control. Selective catalytic reduction (SCR), an efficient treatment technology, has been used worldwide for NO_x removal in large-scale combustors such as coal fired power plants. However, SCR systems have a serious drawback in application to ships is that the traditional catalyst cannot use to the low temperature flue gas emitted from ships. The aim of the research was to develop an innovative method using effective chemical species for NO removal at low temperatures. Vacuum ultraviolet (VUV), wavelength of 172,185, and 190 nm emitted from an excimer lamp, was employed as the excitation source for NO/O_2/N_2/NH_3 gas mixtures at a room temperature. The effects of NH_3/NO molar ratios (M_R), gas flow rate (gas residence time), and oxygen concentrations on NO removal were investigated. An approximate 98% NO_x removal was attained with an M_R=1.5, F=1.0 L/min and 8.3% O_2.
