Influence of potassium on co-combustion characteristic of coal and straw

 Coal and straw were deashed by acid to make experimental samples for the combustion experiments. The effects of alkali metal potassium on the co-combustion characteristic of straw and coal were investigated by TG/DTG/DTA. The results show that KOH promotes the deashed coal and deashed blends of straw and coal to ignite, reduces the temperature of maximum loss weight rate and burning-out, but elevates the ignition temperature of deashed straw. In addition, the co-combustion of straw and coal can be fitted with the first order reaction model. Adding KOH to samples can catalyze the co-combustion and reduce the activation energy by 10kJ/mol.