The issue of the ammonia synthesis cycle ratio?
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How is the ammonia synthesis cycle ratio calculated?
What is the circulation ratio? Is it the ratio of the circulation gas volume to the cold side stream gas volume? If so, a material balance calculation is necessary.
Definition of the circulation ratio: the ratio of circulating gas volume to fresh gas volume. The calculation method involves determining the one-pass conversion rate of hydrogen or nitrogen based on the catalyst’s performance and the operating temperature and pressure, thereby calculating the cycle ratio.
Is it the cyclic air volume/fresh air volume returned to the compressor by the synthesis system?
The design manual for small nitrogen fertilizers seems to use a value of 3.4. In my opinion, the larger the circulation ratio, the smaller the amount of off-gas produced, and the higher the overall yield; however, this results in greater energy consumption； The smaller the cycle ratio, the greater the amount of off-gas, and the lower the overall yield; however, power consumption is reduced ； So there is a moderate value. Additionally, the value of the circulation ratio must be varied within the range of residence time allowed by the reactor! This post was last edited by shuchang on 2009-3-22 16:29]