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Yan’an Energy Chemical Olefin Polymerization Center of Yanchang Petroleum: Successful Technical Upgrade of Circulating Gas Compressor Author/Source: Yanchang Petroleum Yan’an Energy Chemical News Date: 2023-05-09 Views: 24 Recently, reporters learned from the olefin polymerization center that by adding two nitrogen pipelines at the outlet of the C-301 circulating gas compressor in the polypropylene plant, the issue of emergency shutdowns of the plant due to the shutdown of the circulating gas compressor was completely resolved, thereby enhancing the plant’s ability to operate stably over long periods of time. It is reported that the recycle gas compressor C-301 is a key equipment in the polypropylene plant; its function is to raise the pressure of the recycle gas. Part of this gas is used as purging air for the reactor’s powder discharge line, while another part serves as pulse air for the expansion bag filter S-301. If this compressor stops operating, both the discharge line and the bag filter will quickly become clogged, resulting in an emergency shutdown of the plant. Given this situation, after thorough analysis and taking into account the operating experience of similar units, the technical staff decided to add two nitrogen pipelines of corresponding pressure levels at the compressor outlet. These pipelines would temporarily replace the circulating gas after the circulating gas compressor stops operating, thereby continuing to supply purge gas and pulse gas and avoiding an emergency shutdown of the system. “This technical upgrade was completed and put into use during the previous major overhaul. After nearly one and a half years of operation, it has successfully prevented 4 unplanned shutdowns, and its overall performance has been good, which indicates that this technical upgrade was a success. ”Zhang Bo, the head of the olefin polymerization department, said.