Experimental Study on Adjustment of Flame Center Height of a 1 000 MW Opposed Firing Boiler
The experimental study on reducing flame center height was carried out for solving the problems of flame angle corrosion and partial combustion on a one million opposed firing boiler.The effects of sec-ondary air distribution mode,air-coal ratio,coal quantity distribution and speed of separator on flame center height and partial combustion in furnace were studied.It is found that increasing the speed of sep-arator and reducing the air-coal ratio have the most obvious effect on reducing the flame center height.The secondary air distribution mode and pagoda distribution of coal quantity had little effect on reducing the flame center height.The increasing of separator speed contributed to alleviate the gas temperature de-viation.The distribution of coal quantity positive pagoda had no obvious improvement on the deviation of flue gas temperature.The downward shift of secondary air distribution had an alleviating effect on the gas temperature deviation in the main combustion zone,but the gas temperature deviation in the over-fire air zone was grave.The increasing of air-coal ratio of coal mill with serious powder deviation could greatly alleviate the gas temperature deviation in this region.In order to alleviate the partial combustion in the furnace,the air-coal ratio of the same layer burner should be kept at the same level.The deviation should not be too large.The transformation law of flame center height and gas temperature deviation pro-vided guidance for operation,which was helpful to the safe and economic operation of the unit.
opposed firing boilerflame center heightgas temperature deviationair-coal ratioair distributionspeed of separator
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