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Progress of Key Phase Projects for the Overhaul at Yunnan Dade Ammonia Production Company Author/Source: Yunnan Dade Ammonia Production Co., Ltd. Date: 2020-09-13 Clicks: 8 In accordance with the company’s annual overhaul plan, this annual overhaul focuses on carrying out maintenance work with the inspection of the gasification furnace, the renovation of the shift converter unit (installation of E04101A, removal of the oxygenator and pre-shift converter; replacement of the original No. 1 shift converter with a new one, along with the installation of new piping), and the maintenance of the air separation MAN unit as the key control points. As of 17:00 on September 12, 2020, the progress of the above maintenance tasks is as follows: I. Maintenance tasks inside the gasification furnace – All the pins that needed to be replaced in the furnace chamber have been welded in place ； The quench platform is replacing the horizontal pipes; 56 of the pipes that were removed during this replacement have been restored, with 7 more remaining to be restored ； The water wall tubes that have been thinned and cut from the gas pipeline are undergoing seal welding ； The coiled tubes that were removed from the lower part of the SGC cross hanger have been restored; work is currently in progress to restore the water wall tubes (47 tubes were removed in total, with 10 already restored) as well as the 7-shaped tubes (18 tubes were removed in total, with 3 already restored) ； Burner is being restored. II. Transformation project for the conversion unit: In the piping of the old and new gas preheaters E04101A and E04101, the inlet and outlet pipes for raw gas at E04101A, as well as the inlet pipe for pre-converted gas, have been welded. Regarding the piping for the outlet of the pre-converted gas, the inlet pipe for raw gas at E04101A and the pipes related to the bypass system have been modified ； E04101 showed leaks in 6 tubes; after sealing the leaks, the head was reinstalled ； The outlet pipe of the new First Transformation Furnace has been welded; the inlet pipe is under welding ； The inlet and outlet pipes of the pre-heating furnace have been welded. III. Maintenance tasks for the main air compressor unit in the air separation plant: The turbine cover of the MAN unit has been reinstalled, and bolts are being tightened ； The water cooler of the nitrogen cycle compressor is having its inlet and outlet pipelines repaired; instrumentation technicians are adjusting the inlet vanes and the wiring in the intermediate tank ； The air compressor is ready to have its internal cooler reinstalled.