To find out the specific reason for desulfurization slurry poisoning when some power plants burn Majialiang coal

experiments about co-firing the Dahun coal with Majialiang coal of different proportions were carried out.The composition analysis and size analysis for fly ash collected from different locations of the precipitator show that

the Majialiang coal and Dahun coal has almost the same fluoride and aluminum content

their fly ash's composition has no obvious difference.However

with an increase in proportion of Majialiang coal in the mixture

the particle size of fly ash gradually decreased

and the proportion of fine particles gradually increased

which could cause a reduction in the efficiency of the electrostatic precipitator

resulting in more fine dust entering into the desulfurization tower.Thus

the fluoride and aluminum content in the desulfurization slurry increased

causing poisoning and deactivation of the slurry.After the electrostatic precipitator was transformed into the electric-bag filter

the slurry poisoning problem of burning Majialiang coal was successfully solved.However

when the proportion of Majialiang coal rose

the pressure difference in the electric-filter precipitator increased more significantly.Therefore

properly controlling the co-firing ratio fo Majialiang coal can keep the pressure difference within a reasonable range.