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The alcohol-ammonia production unit of Shanxi Coking Chemical Industry successfully completed the switch between the two production systems. Author/Source: Shanxi Coking Chemical Industry Co., Ltd. Date: November 21, 2022. Clicks: 12. On November 16, the alcohol-ammonia production unit of Shanxi Coking Chemical Industry successfully carried out the switch from the methanol production system to the comprehensive utilization system of coal gas, and was able to produce methanol as a result. To ensure the smooth progress of this switching operation, the equipment team first arranged for external personnel to remove insulation and set up scaffolding at the areas that needed to be inspected and repaired ； Arrange maintenance personnel according to the plan, familiarize them with the inspection and maintenance tasks in advance, and develop feasible solutions ； The process team formulated a replacement, pressure testing, leak detection, and commissioning plan based on the methanol production system. It is reported that for this methanol processing operation, a total of 138 blind flanges need to be removed and installed, 18 valves need to be replaced, and 4 pumps require maintenance. Based on the production conditions, work was first carried out to remove and reinstall blind flanges in the units that had been shut down earlier. After 88 hours of hard work, all tasks related to removing and reinstalling blind flanges, repairing pumps and machinery, as well as carrying out repairs on instruments and electrical systems along with testing, were completed by November 14th. At 8:30 on November 14, the ammonia synthesis unit area and the advanced desulfurization unit area were shut down as scheduled. The process team immediately filled the pipelines of the methanol system with nitrogen to prepare in advance for the maintenance work. Meanwhile, thanks to the efforts of the maintenance and operational staff, the methanol system entered the commissioning phase on the afternoon of November 14. Subsequently, the nitrogen displacement leak test for precise desulfurization was completed, after which the precise desulfurization process entered the heating phase; meanwhile, tasks such as system conversion and the two-in-one process also began with nitrogen displacement in advance. On November 15, the two-in-one unit was started, and the second speed critical point was reached. At 15:30 on the afternoon of November 16, the air separation oxygen compressor was started, and pressure testing and leak checking of the unit were completed. At 16:10 in the afternoon, oxygen preparation for the conversion process was finished and the gas was sent to the synthesis unit. By 17:00, the methanol system was operational and began producing methanol. As arranged by the company, this workshop will be able to carry out a dual switch-over between the methanol system and the comprehensive utilization production system for gas at any time, ensuring the stable operation of the production system.