Tail gas-recycled sulfur recovery method
A technology of tail gas recycling and sulfur recovery, applied in separation methods, chemical instruments and methods, and sulfur preparation/purification, etc. The effect of reducing emissions and reducing pollution
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[0017] Embodiment 1: A tail gas recycling sulfur recovery method. The tail gas recycling sulfur recovery method includes: washing the external acid gas with low-temperature methanol, mixing and diluting it with oxygen-free gas to a concentration of 3%, separating the condensed water, and passing the acid The gas preheater is heated to 220°C, mixed with the calculated oxygen content and heated to 220°C by the air preheater, and then enters the catalytic oxidation reactor for reaction. The reacted gas enters the condenser to condense sulfur, and the condensed air The gas-liquid mixture is separated from the liquid sulfur and gas by the sulfur separator, and the gas is discharged after being washed by the scrubber; the tail gas recycling sulfur recovery method also includes: 1) When the original start-up and the system is shut down and restarted, the external acid gas is mixed to dilute and reduce The oxygen-free gas with a concentration of 3% is nitrogen. After normal driving, the o...
Example Embodiment
[0024] Embodiment 2: A tail gas cycle sulfur recovery method. The tail gas cycle sulfur recovery method includes: mixing and diluting the external acid gas with oxygen-free gas to a concentration of 2%, separating the condensed water, and passing it through an acid gas preheater It is heated to 200°C, mixed with the calculated oxygen content and heated to 200°C by the air preheater, and enters the catalytic oxidation reactor for reaction. The reacted gas enters the condenser to condense sulfur, and the condensed gas-liquid mixture is passed through The sulfur separator separates liquid sulfur and gas, and the gas is discharged after being washed by the scrubber; the tail gas recycling sulfur recovery method also includes: 1) When the original start-up and when the system is shut down and restarted, the external acid gas is mixed and diluted to a concentration of 2 % Of the oxygen-free gas is nitrogen. After normal driving, the oxygen-free gas is the calculated exhaust gas after be...
Example Embodiment
[0032] Embodiment 3: A tail gas cycle sulfur recovery method. The tail gas cycle sulfur recovery method includes: mixing and diluting the external acid gas with oxygen-free gas to a concentration of 5%, separating the condensed water, and passing the acid gas preheater It is heated to 210°C, mixed with the calculated oxygen content and heated to 210°C by the air preheater, and then enters the catalytic oxidation reactor for reaction. The reacted gas enters the condenser to condense sulfur, and the condensed gas-liquid mixture is passed through The sulfur separator separates liquid sulfur and gas, and the gas is discharged after being washed by the scrubber; the tail gas recycling sulfur recovery method also includes: 1) When the original start-up and system shutdown and restart, the mixed dilution of the external acid gas is reduced to a concentration of 5 % Of the oxygen-free gas is nitrogen. After normal driving, the oxygen-free gas is the calculated exhaust gas after being wash...
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