Through adjusting the blade’s angle of the external overfire air,opening the external overfire air or not,gets the velocity field and the distribution of velocity vector and analyses the result of the numerical simulation and then obtains the rule of different parameter’s influence in the flow.

Sensitivity analysis of effect of the secondary air distribution mode on the unburned carbon is studied in this paper,meanwhile,a multi-complex algorithm is employed to perform a search to determine the optimum solution of optimal recursive neural network(ORNN),which is used to set up a boiler property model,so as to obtain currently optimum distribution mode of secondary air.

Reasonable design of secondary air gates is one of the effective measures for the gases in the chamber to mix evenly and react completely.

After numerical simulation validity was confirmed by experimental results on cold model test,the erosion property in a circulating fluidized bed(CFB) with a rectangular cross-section was analyzed using numerical simulation under the condition of different primary/secondary air ratio,different up/down secondary air ratio and different front/back secondary air ratio.

The Effect of secondary air in medium-sized fluidized bed gasifier (size: 300×300mm2 ,height:5m) of bio-mass( wood powder) on gasification efficiency, secondary reaction and tar contents a series of experiments were studied in this paper.

The process of NO x formation is influenced by some factors,such as characteristics of fuel,surplus air ratio,primary air ratio,secondary air ratio,combustion temperature and so on,which is mainly discussed in this paper from the aspects of technology.

The effects of secondary air ratio and its injection angle on gas flow field and gas recirculating flow were conducted.

An industrial experiment were conducted to test the influence of excess air coefficient and secondary air ratio on the carbon content of fly ash of CFB boiler burning Fujian anthracite.