关键词: 硫磺回收, 尾气焚烧炉, 熄火保护, 尾气加热器, 尾气组成, 燃料气组成, 腐蚀, 积硫

Abstract:

The tail gas incinerator of a sulfur recovery unit encountered problems such as leakage of the tail gas heater, frequent flameout of the furnace, and sulfur accumulation in the tail gas pipeline, resulting in excessive sulfur emissions. A thorough analysis of the causes of these problems was conducted, and a series of targeted measures were developed: For the leakage issue of the tail gas heater, the cross-line process of the tail gas treatment section was switched, and a nitrogen circulation system in the tail gas hydrogenation system was established, while upgrading the material; For the frequent flameout issue, the impurity content of sulfur-containing waste gas at the top of the tail gas upgrading and purification unit's oxidation reactor was controlled; For the sulfur accumulation issue in the tail gas pipeline, measures such as adding blind plates to the start-up flue gas line, adding nitrogen seals to the tail gas incinerator cross-line, or stopping the use of the cross-line, and discharging the waste gas from the top of the oxidation reactor after water washing were taken. The abnormalities of the tail gas incinerator were resolved, and the SO2 emission concentration met the special emission limit of atmospheric pollutants for process heaters (not exceeding 50mg/m³). The tail gas incinerator of the sulfur recovery unit achieved long-term stable operation.

Key words: sulfur recovery, tail gas incinerator, flameout protection, tail gas heater, tail gas composition, fuel gas composition, corrosion, sulfur accumulation