| abstract |
The invention belongs to the technical field of flue gas treatment and environmental protection of a thermal power plant, and particularly relates to a flue gas treatment device for semi-dry desulfurization and low-temperature SCR denitration of carbide slag, which comprises a primary pre-dust remover, a carbide slag powder bin, a water tank, a high-pressure water pump, a backflow type atomizing nozzle, an ash discharge conveyor, a desulfurization tower, a bag-type dust remover, GGH, a steam heater, a chimney, an ammonia water evaporation system, an SCR reactor, an ammonia injection grid, a catalyst and a rectification grid, wherein SO2 and NOx in the flue gas are removed from the flue gas sequentially through the desulfurization tower, the bag-type dust remover, the GGH, the steam heater and the SCR reactor; the low-temperature SCR denitration process is added on the basis of the original SNCR denitration, indexes of SO2 and NOx concentration of a modified flue gas outlet all reach the national ultra-clean emission standard, the semidry flue gas desulfurization process is a novel process, heavy metals such as SO3, HCL, HF and Hg can be removed except SO2, and the low-temperature SCR denitration process is low in construction and operation cost and high in cost performance and is gradually popularized and applied to small and medium-sized thermal power generating units. |