Abstract: A new combined desulfarizatinn/denitraticon (DeSOx/DeNOx) procees was teeted in this study.
The procees uses the so-called powder-partlcle fluidized bed (PPFB) as the major reactor in
which a coarse DeNOx catalyst, several hundrsd micrometers in size, is fluidized by flue
gas as the fluidization medium particles while a contlnuogsly supplied fine DeSOx sorbent,
several to tens of micrometers in dianteter, is entrained with the flue gas. Ammonin for
NOx reduction is fed to the bottom of the bed, thus, SOx and NOx are simultaneously removed
in the single reactor.By adopting a model gas, SO2-NO-HaO-N2-air, to simulate actual flue
gas in a laboratory-scale PPFB, simultaneous SO2 and NO removals were explored with respect
to various gas components of fluegas. It was found that the vaxlations of SO2 removal with
concentrations (fractions) of oxygen, water vapor, SO2 and NO in flue gas are little
affected by the simultaneous NOx reduction. However,the dependencles of NO removal upon
such gas components are clveely related to the inter-actions between DeSOx sorbent and
DeNOx catalyst.

Key words: environment, combustion, combined SO_x/No_x removal, fluidized bed, powder-particle technology

摘要： A new combined desulfarizatinn/denitraticon (DeSOx/DeNOx) procees was teeted in this study.
The procees uses the so-called powder-partlcle fluidized bed (PPFB) as the major reactor in
which a coarse DeNOx catalyst, several hundrsd micrometers in size, is fluidized by flue
gas as the fluidization medium particles while a contlnuogsly supplied fine DeSOx sorbent,
several to tens of micrometers in dianteter, is entrained with the flue gas. Ammonin for
NOx reduction is fed to the bottom of the bed, thus, SOx and NOx are simultaneously removed
in the single reactor.By adopting a model gas, SO2-NO-HaO-N2-air, to simulate actual flue
gas in a laboratory-scale PPFB, simultaneous SO2 and NO removals were explored with respect
to various gas components of fluegas. It was found that the vaxlations of SO2 removal with
concentrations (fractions) of oxygen, water vapor, SO2 and NO in flue gas are little
affected by the simultaneous NOx reduction. However,the dependencles of NO removal upon
such gas components are clveely related to the inter-actions between DeSOx sorbent and
DeNOx catalyst.

关键词: 性能;烟道气;直接脱硫;脱硝工艺;粉粒流化床;SO_x/NO_x;环境保护