EXHAUST GAS DENITRIFICATION SYSTEM, AND REGENERATION METHOD AND CATALYST REPLACEMENT METHOD IN EXHAUST GAS DENITRIFICATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a system and a method for denitrification of exhaust gas, capable of precisely grasping the concentration distribution of a gas component, and performing efficient denitrification.;SOLUTION: The exhaust gas denitrification system includes: an ammonia injection device 104 serving as reducing agent supply means for supplying a reducing agent (NH₃) into flue gas 102 from a boiler 101; a denitrification device 105 having partitioned denitrification catalysts 106A, 106B, 106C for denitrifying nitrogen oxide (NOx) containing the reducing agent; and a gas component concentration distribution measurement device 110 which is provided on an exit side of the denitrification device, which has probe means having multiple light transmitting tubes 112A (112B, 112C) for measuring concentration distribution of a gas component (NH₃) in exhaust gas in areas, corresponding to the partitioned denitrification catalysts 106A, 106B, 106C, orthogonal to a gas stream of the denitrification device, and which measures ammonia concentration by laser measurement means. On the basis of the measurement result of the ammonia concentration by the gas component concentration distribution measurement device 110, concentration distribution of ammonia in the partitioned areas is obtained.;COPYRIGHT: (C)2014,JPO&INPIT