Directing against the problem of flue gas temperature deviation in tangential firing boiler of one large-capacity supercritical 600 MW unit

the influence of two measures

namely reversed tangence of the burn-away air

and reducing the included angle between horizontally declined auxiliary secondary air and the primary air

upon the temperature field in furnace

the tangential circle of flame

the rotational momentum

the distribution of proper components

as well a NOx emission etc.in the combustion process has been analysed.Results show that the reversed tangence technology of burn-away air can better reduce the deviation of flue gas temperature

the above-mentioned two measures can enhance the flue gas temperature in the region of burners

reducing the diameter of flame tangential circle is helpful to stabilize combustion

and alleviate slagging on the water-wall

but all may result in augmentation of NOx emission concentration.