Methanation over-temperature control problem
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As a unit that employs methanation as a control step prior to the ammonia synthesis plant, what strict controls are in place regarding the CO+CO2 content entering the methanation process? What are the risks associated with the accompanying transformation and PSA decarburization processes, and what are the control measures?
CO can be controlled at 5%-8%, while CO2 can be kept below 2%. If CO is controlled at too high a level, the conversion rate decreases, and the total amount of CO2 entering the pressure swing adsorption unit is reduced, which affects the purity of the vacuum achieved; in particular, the purity during the second stage of vacuuming is affected. This depends on the design and operating procedures of the pressure swing adsorption system