Air addition in two-stage furnace
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Why is the control of the hydrogen-to-nitrogen ratio when air is added in the two-stage furnace at Kellogg slightly higher than the actual hydrogen-to-nitrogen ratio control during synthesis?
Because in a two-stage furnace, the oxygen in the air has to react with hydrogen. So the control is slightly higher.
Reply to 2# love_fly_1: After some thought, the reason is likely that the methanation process that follows requires a certain amount of H2; therefore, it’s necessary to maintain a slightly higher hydrogen-to-nitrogen ratio earlier on, so that the synthesis system has an appropriate hydrogen-to-nitrogen ratio.
The process from stage two to synthesis takes about 6-7 minutes; a higher hydrogen-to-nitrogen ratio facilitates operation