The invention provides a
sulfur recovery technology realizing low
sulfur emission. The
sulfur recovery technology comprises a
combustion furnace, a first-stage Claus reactor, a second-stage Claus reactor, a selective hydrogenation reduction reactor, a selective oxidation reactor and two adsorption desulfurization towers capable of being connected in series or parallel, and the devices are sequentially connected in series; the total sulfur
conversion factor of process
effluent gas is that SO2 is smaller than or equal to 10 mg / m<3> through proper selection of various catalysts and desulfurizers and accurate control of
process conditions of steps. The desulfurizers after breakthrough are subjected to in-situ thermal regeneration by
inert gas at the temperature of 250-300 DEG C, regenerated outlet gas returns to the
combustion furnace, a condenser I behind the
combustion furnace, a condenser II behind the first-stage Claus reactor, a condenser III behind the second-stage Claus reactor, a condenser IV behind the selective hydrogenation reduction reactor or a condenser V behind the selective oxidation reactor,
sulfide such as elemental sulfur, H2S,SO2 and the like in the regenerated gas is recovered, and the total sulfur
conversion factor of exhaust
tail gas in the regeneration period of the desulfurization towers is that SO2 is smaller than or equal to 10 mg / m<3>. The sulfur
recovery technology realizing low sulfur emission has the advantages of the low sulfur emission, the long-term operation of the desulfurizers, the high desulfurization capacity, the small number of replacement times, the low expenses and the like.