Practical Exercise on Purification Technology Version [028]
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Reasons for desulfurization in low-temperature shift catalysts: High inlet temperature of the low-temperature shift reactor; low hydrogen sulfide content in the gas; high gas-to-oil ratio. Coal chemical processing – 2017 edition: “My Technical Upgrades” (significant rewards available). http://bbs.hcbbs.com/thread-1786290-1-1.html Registration for chemical engineers – experience-sharing event titled “Learning from Others’ Experiences”. http://bbs.hcbbs.com/thread-1808158-1-1.html
The inlet temperature of the low-temperature converter is high. The gas contains low levels of hydrogen sulfide, and the gas-to-vapor ratio is high
The inlet temperature of the low-temperature converter is high; the gas contains low levels of hydrogen sulfide, and the steam-to-gas ratio is high
Low H2S content, high gas-to-vapor ratio, high temperature in the low-temperature shift catalyst layer
High inlet temperature of the low-temperature converter; low hydrogen sulfide content in the gas; high steam-to-gas ratio
The desulfurization of cobalt-molybdenum-based catalysts refers to the transformation of the metal sulfides, which are the active components of these catalysts, into metal oxides under certain conditions, with hydrogen sulfide being released as a result; this causes the catalyst to lose its activity. This phenomenon is known as the reverse sulfidation reaction of sulfur-resistant shift catalysts. The main processes involved are the oxidation of MoS2 and the release of sulfur. The reaction equation is: MoS2 + 2H2O = MoO2 + 2H2S. The primary reasons for this reverse sulfidation reaction are abnormal operating conditions, such as too high an inlet temperature, too low a hydrogen sulfide content in the gas, or an excessively high gas-to-vapor ratio. To prevent desulfurization, it is necessary to ensure that the hydrogen sulfide content in the gas entering the shift reactor remains above the minimum level required to counteract reverse sulfidation.
The hydrogen sulfide content at the inlet of the low-temperature converter is low; the inlet temperature is high; and the steam-to-gas ratio at the inlet is too high
1. High gas-to-vapor ratio； 2. Hydrogen sulfide level is too low ； 3. High temperature
1. High gas-to-vapor ratio； 2. Hydrogen sulfide level is too low ； 3. High temperature