47 High Efficient Abatement of SO_2 and NO in a Single Fluidized Bed Reactor

抄録

A new combined desulfurization/denitration (DeSO_x/DeNO_x) process is developed by using a powder-particle fluidized bed (PPFB). In the process, SO_x is removed by continuously supplied fine DeSO_x sorbent of several to tens micrometers, and NO_x is reduced to N_2 by ammonia under catalysis of DeNO_x catalyst. By using model gases containing SO_2 and NO in a laboratory-scale PPFB reactor, the removal efficiency of this process is tested in this paper with respect to the choices of DeNO_x catalysts and DeSO_x sorbents. The titanium-supported catalysts, both. V_2O_5.WO_3/TiO_2 and WO_3/TiO_2, are found to be adaptive for high NO removal, such as greater than 95%, of this process. The copper oxide sorbent, CuO.V_2O_5.K_2SO_4/Al_2O_3, and the aluminum-supported carbonate, Na_2CO_3/Al_2O_3, are capable of high SO_2 removal (>95%) at the stoichiometric ratio of sorbent to SO_2. However, a poisoning of NO_x reduction (DeNO_x catalyst) by such a copper oxide sorbent makes the simultaneous SO_x and NO_x removals, with the efficiency of greater than 95%, be available only for sorbent Na_2CO_3/Al_2O_3.