NOX REMOVAL EQUIPMENT, HEAT RECOVERY BOILER PROVIDED WITH NOX REMOVAL EQUIPMENT, GAS TURBINE COMPLEX POWER-GENERATING PLANT AND NOX REMOVAL METHOD

摘要

To enable dilution air to be supplied stably, restrict exhaust gas discharged from a gas turbine against its flowing into an ammonia injection device and prevent occurrence of ammonium carbonate within the ammonia injection device and prevent blockage of the ammonia injection device caused by accumulation.SOLUTION: This invention relates to a NOx removal device 20 comprising a duct 22 for guiding and flowing exhaust gas from a turbine 52 of a gas turbine 50 having a compressor 52 and a turbine 56; an ammonia injection device 24 for scattering mixture gas of ammonia gas and diluting air into the duct 22; and NOx removal catalyst 26 arranged in the duct 22 at a downstream of the exhaust gas of the ammonia injection device 24 and an extraction line 76 connected to a low compression part of the compressor 52 of the gas turbine 50 to supply air extracted from the compressor 52 into the ammonia injection device 24 as diluting air.SELECTED DRAWING: Figure 1