Abstract:

The ethylene compressor of a cracking plant was started up after overhaul, and its over high refrigerant consumption and poor refrigeration effect had a certain impact on the refrigeration system. Through preliminary investigation, it was considered that the over high refrigerant consumption was due to the excessive nitrogen content of ethylene medium, which led to poor refrigeration effect. Further investigation on the dry gas seal structure of compressor unit and the site showed that nitrogen entered the compressor and mixed with ethylene medium due to the reverse connection of the secondary air inlet line with the pressure line of seal cavity, resulting in poor refrigeration effect.

Key words: ethylene compressor, refrigerant consumption, dry gas seal