Abstract
The calcined limestone used partly for sulphur retention under a reducing condition was found to provide a strong activity for the nitric oxide reduction by carbon monoxide over the temperature range pertinent to fluidized bed combustion. A thermogravimetric analysis indicated that the enhanced reduction of nitric oxide was attributed to the increase in catalytic activity. The simultaneous removal of sulphur dioxide by calcined limestone and nitric oxide by carbon monoxide was conducted by use of a continuous fluidized bed of quarz sand and calcined limestone. The result indicates that the rate of nitric oxide reduction is enhanced by the simultaneous sulphur retention. This demonstrates that the reduction of nitric oxide formed in fluidized bed combustion of coal is promoted by the simultaneous sulphur capture under a staged air firing.
