Desulfurization system

The utility model relates to a desulfurization system which comprises a desulfurization tower and a swirler, wherein, a slurry outlet is formed at the bottom part of the desulfurization tower, a slurry pump is connected with the slurry outlet, the feed opening of the slurry pump is communicated with the slurry outlet, the discharge port of the slurry pump is communicated with the slurry inlet of the swirler, an evaporating crystallizer is arranged between the slurry pump and the swirler, the inlet of the evaporating crystallizer is communicated with the discharge port of the slurry pump, and the outlet of the evaporating crystallizer is communicated with the slurry inlet of the swirler. In terms of the scheme contributing to prolonged service life of the desulfurization system, the desulfurization system allows a gas washing liquid as a result of reaction to be evaporated and crystallized in the evaporating crystallizer outside the desulfurization tower instead of inside the desulfurization tower, thereby pre