Urea water for reducing denitration and denitration apparatus using the same

摘要

PPROBLEM TO BE SOLVED: To provide urea water with urea precipitation controlled and a highly reliable denitrification apparatus using the urea water. PSOLUTION: In a SCR system 1 in which by the reduction effect of the urea water (ammonia) supplied from a urea water addition nozzle 5, NOx contained in exhaust gas 8 from an engine 2 is purified in an SCR catalyst 3, as the urea water to be used, urea water added with formaldehyde for controlling the precipitation of urea is used. PCOPYRIGHT: (C)2005,JPO&NCIPI