August 2020

Maintenance and Reliability

Improve stability of ammonia plant steam systems to reduce unscheduled plant shutdowns

Dyno Nobel runs a 2,300-metric tpd purifier plant in Waggaman, Louisiana.

Shukla, A., Dyno Nobel; Chandani, H., KBR; Thomerson, C., AVEVA

Dyno Nobel runs a 2,300-metric tpd purifier plant in Waggaman, Louisiana. It is one of the first onshore ammonia plants to be built in the U.S. in the past 20 yr, and one of the first built in Louisiana in a quarter century. The plant started operations in 2016. In its first year, the plant experienced frequent back-end trips that destabilized the steam system, resulting in a front-end trip that caused significant plant downtime. In an ammonia plant, steam system stability is imperative for maximizing plant uptime. Due to the close integration between the process and the steam system (FIG. 1), any disturbance in the process can propagate to the steam system and affect the entire plant. The

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