The invention discloses a wet desulphurization technology and
system using
coal ash. The wet desulphurization technology using
coal ash mainly comprises the following steps: (1) collecting superfine
coal ash in
flue gas which is generated after boiler
combustion, and conveying the collected superfine coal ash to a liquid preparation tank; (2) fully reacting activating oxides in the superfine coal ash with a certain proportion of water in the liquid preparation tank so as to obtain an alkaline solution; (3) conveying the alkaline solution to a desulphurization circulating
pool; and (4) enabling the alkaline solution in the desulphurization circulating
pool to circularly flow between a desulphurization
tower and the desulphurization circulating
pool so as to realize the removal of
sulfur in the
flue gas. The wet desulphurization
system using coal ash comprises a
dust collector, the liquid preparation tank, the desulphurization circulating pool and the desulphurization
tower. According to the technology and the
system, the removal of
sulfur in the
flue gas is realized by directly using the activating oxides contained in the coal ash. The desulfurized coal ash
solid liquid generated after desulphurization can be reused, so that the comprehensive cyclic utilization of the coal ash is realized, and the utility value of the coal ash is fully exerted; and the wet desulphurization technology and system using the coal ash are particularly suitable for the removal of
sulfur of
sulfur dioxide in
flue gas of small and medium-sized industrial pulverized coal boilers with the raw coal
sulfur content of below 1.0%.