How to determine the optimal residual methane level in the methane steam conversion reaction
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In the process of synthesizing ammonia via methane steam reforming, there are two stages of reforming, with the second stage being air reforming. Changes in load can cause significant variations in the residual methane content at the outlet of the reforming section. This process includes cryogenic purification, and the residual methane can be returned to the reforming section as fuel. What is the optimal level of residual methane content? If the methane converted and exported is very low, more methane needs to be burned, and there is less methane in the gas returning later on, resulting in a lower calorific value ； If the methane content at the exit of the conversion section is increased, fuel consumption is low and the methane content in the recycled gas is high, but the total ammonia production decreases.
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