This paper introduced a method of the cold model test and its test result, exploited the effect of changing pulverizing system operating mode on the main stream and the degree of admission in furnace, when the proportion of primary air? secondary air and tertiary air is changed.

Applying the new technique of rich oxygen burning,improving and saving energy,discusses the advantages of the technique of rich oxygen burning at present, by elevating the furnace temperature, decreasing smoke heat loss, and avoiding the atmosphere pollution from nitrogen,also points out the way when disposing the hot side of boiler, and put forward the new way of new boiler product development.

Through simulating the influence of various ratio of primary and secondary air,position of upperlevel secondary air,coefficient of excess air,upon furnace temperature of the CFB boiler,and distribution of SO_2 and NO_x emission,the reasonable optimality of operational parameters has been a.

With increased rear-arch and used high temperature and pressure steam as the secondary air,the furnace temperature and combustion efficiency was increased and the carbon particle s staying in furnace was also prolonged in addition to a good economic and social benefit.

2 YM2 tangentially fired boiler serving as a prototype a cold state modeling test was conducted with a view to studying the gas flow characteristics in the boiler furnace and the effect of furnace height on the gas velocity excursions in the horizontal flue.

The effect of furnace arch structure and furnace height on velocity deviation of flue gas channel is studied.