The invention belongs to the technical field of thermal power
plant flue gas treatment
environmental protection, and specifically relates to a
carbide slag semi-dry desulfurization and low-temperatureSCR denitration
flue gas treatment device. The
carbide slag semi-dry desulfurization and low-temperature SCR denitration
flue gas treatment device comprises a primary pre-dust remover, a
carbide slagpowder bin, a water tank, a high-pressure water pump, a
backflow type atomizing
nozzle, an ash
discharge conveyor, a desulfurizing
tower, a bag-type dust remover, a GGH, a steam heater, a
chimney, anammonia water
evaporation system, an SCR reactor, an
ammonia spraying grid, a catalyst, and a rectifying grid;
flue gas is sequentially delivered through the desulfurizing
tower, the bag-type
dust collector, the GGH, the steam heater and the SCR reactor to remove SO2 and
NOx in the
flue gas; a low-temperature SCR denitration process is added on the basis of original SNCR denitration; indexes of SO2 and
NOx concentration at a
flue gas outlet after transformation reach national ultra-clean emission standards, the semi-dry
flue gas desulfurization process is a novel process, SO3, HCL, HF and
heavy metals such as Hg can be removed besides SO2, and due to low construction and operation cost and high
cost performance, the carbide
slag semi-dry desulfurization and low-temperature SCR denitrationflue gas treatment device is gradually popularized and applied in small and medium-sized thermal power generating units.