April 2015

Special Report: Petrochemical Developments

Use multistage integrated chilling to increase ammonia production

A new revamp approach for ammonia plants uses multistage integrated chilling (MIC). The MIC scheme provides an option that avoids expensive compressor upgrades for incremental improvements in ammonia production, with energy efficiency improvements up to 15%.

Arora, V. K., Kinetics Process Improvements, Inc.

Ammonia plant operators strive to maximize energy efficiency and ammonia production while minimizing capital cost and downtime, without adding risk or sacrificing operating reliability. However, any significant improvement in energy efficiency without a reasonable increase in ammonia production rarely meets the payout criteria to justify such revamps, which typically require expensive upgrades and downtime to debottleneck compressors and other major equipment. A majority of older ammonia plants have been revamped for higher capacity and improved energy efficiency. Most of them have significant scope to improve energy efficiency while they have been stretched to the maximum operating limit

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