Reduction of NO by coal and char was investigated in a high temperature gas-solid reactor under the suspension and spray condition of industry precalciner.The effects of temperature and the presence of cement raw meal on the reduction of NO were discussed.The results indicate that the reduction capacity of the Chenzhou char is weaker than that of the Chenzhou coal,and the higher volatile content in coal,the stronger reduction capacity of the coal.The NO reduction increases with the presence of cement raw me...