Linde cryogenic purge gas recovery process in synthetic ammonia plant was introduced.Taking an example of abnormal temperature rise of the cold box in a practical plant,it's searched from process,equipment and instrument to find the fundamental reasons of the accidents,such as tube leakage in heat exchanger and failure of on-line ammonia content analyzer.Corresponding measures were taken to release the hidden troubles.To provent similar problems from happening again,the optimizing and on-line detection measures were presented to enable the stable operation.
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