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Significant improvements achieved in the renovation of the air compressor station at the air separation unit of Yulin Coal Chemical Synthesis Center of Yanjiang Petroleum. Author/Source: Shaanxi Yanjiang Petroleum Yulin Coal Chemical Co., Ltd. Date: April 16, 2022. Clicks: 9. A few days ago, the dryers associated with the screw compressors in the first phase of the air separation unit at Yulin Coal Chemical Synthesis Center experienced abnormal operation, which had a direct impact on the stable functioning of the subsequent equipment. It is reported that as the company’s production facilities continue to be optimized and their operating loads increase, the demand for instrument gas rises significantly. The existing dryers, with their low power, low heating temperatures, and poor adsorption capacity, can no longer meet the requirements of the current operational conditions. To address this issue, the company has decided to replace it with a new type of high-power dryer to ensure the long-term stable operation of the equipment. During the maintenance period, the synthesis center developed a technical improvement plan for the screw compressor dryers. The maintenance staff strictly followed this plan to add molecular sieves to the adsorbents in the equipment, as well as an online dew point analyzer to the outlet pipeline, ensuring that the dew point temperature at the compressor’s outlet was within acceptable limits. After a period of trial operation, the screw compressors and dryers in Phase 1 of the air separation unit at the synthesis center have performed well; the outlet dew point temperature has met the requirements of the normal production process and remained below -65°C. In the later stage, the synthesis center will operate the equipment in strict accordance with the new air compressor station operation plan and record the relevant operational data to ensure the normal standby status of the air compressor station.