关键词: 液硫池废气, 加氢, 催化剂, 耐氧型, 工业应用

Abstract:

For most Claus sulfur recovery units, the sulfur-containing and oxygen-containing waste gases from liquid sulfur pool are usually introduced into the incinerator for incineration, resulting in a significant increase in the concentration of SO₂ in the discharged flue gas, posing a risk of exceeding environmental standards. In order to achieve the treatment and resource utilization of sulfur-containing waste gas, a new type of antioxidant low-temperature tail gas hydrogenation catalyst has been developed and evaluated. The physical and chemical properties, catalytic activity, and oxygen resistance indicators have been examined. The oxygen volume fraction in the imported feedstock tail gas of the reactor can reach 1%. Based on the excellent catalytic activity and oxygen resistance of the new hydrogenation catalyst, a new process technology for recovering waste gas from liquid sulfur pool to the hydrogenation reactor has been developed. The temperature rise of the reactor bed is about 36 ℃ higher than that of the conventional process, and the organic sulfur hydrolysis conversion rate reaches 100%. In 2019, the technology was first applied to a 200,000 TPY two-stage conventional Claus sulfur recovery unit in Puguang Gas Field. The results show that the performance of the new antioxidant low-temperature tail gas hydrogenation catalyst is comparable to that of imported catalysts, and its oxygen resistance meets the demand for resource conversion of waste gas from oxygen-containing liquid sulfur pool in large sulfur recovery units. The reduction in SO₂ emissions from flue gas is over 50%, and the emission concentration is below 200 mg/m³. This technology can be promoted and applied in similar sulfur recovery units.

Key words: waste gas from liquid sulfur pool, hydrogenation, catalyst, oxygen resistant type, industrial application