The invention discloses an efficient purifying method for exhausted
tail gases from firing of
gangue baked bricks in a portable
tunnel kiln. The efficient purifying method comprises the following process steps of stacking raw materials: stacking green
gangue bricks and limestone in an annular
kiln bottom between annular tracks of the portable
tunnel kiln;
roasting the green
gangue bricks and the limestone in the
kiln to desulfurize:
roasting the green gangue bricks and the limestone in an arc
kiln body according to a certain temperature raising procedure, and performing primary desulfurization by high-temperature
roasting; performing wet
flue gas desulfurization: feeding the calcined limestone into a desulfurizing liquid adjusting
pool, and adjusting the basic strength in the adjusting
pool; introducing
tail gases in the kiln body into a desulfurizing
tower, sprinkling the desulfurizing liquid in the desulfurizing liquid adjusting
pool into the desulfurizing
tower, and performing secondary desulfurization by a
chemical reaction generated in the desulfurizing
tower. According to the efficient purifying method disclosed the invention, by the adoption of a combined desulfurization method of desulfurization by roasting in the kiln and the wet
flue gas desulfurization, the problems of desulfurization and purification of the
tail gases in the portable
tunnel kiln are successfully solved; meanwhile, energy sources can be saved, and the purification cost is reduced.