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Record of the Upgrade and Renovation of the DCS System for Boiler No. 3 at Shanxi Chemical Industry Company. Author/Source: Shanxi Chemical Industry Company. Date: 2022-07-05. Clicks: 16. The upgrade and renovation of the boiler DCS system at Shanxi Chemical Industry Company was a key task in the maintenance of Boiler No. 3; in addition to the upgrade of the software system, the hardware components such as 7 operation computers, control stations, network cables for the operation computers, 4 switches, 5 redundant CPUs for the control stations, communication cards, and power modules all needed to be replaced. During the upgrade of the DCS system for Boiler No. 3, the branch factory attached great importance to this task; various meetings were held to make arrangements, emphasizing the need for thorough preliminary preparations. A construction plan was developed based on the actual conditions of Boiler No. 3, and the technical experts from the branch factory together with the manufacturer worked continuously to refine and adjust this plan. It was repeatedly stressed that during the installation process, physical isolation and appropriate warning signs should be in place at the control stations of Boilers No. 1 and No. 2 to prevent accidental operations by personnel. Proper management of permits and documents was required, as well as the assignment of dedicated personnel to oversee the entire process. It was important to learn from the lessons and challenges encountered during the upgrade of Boiler No. 1, to summarize experiences, and to address any shortcomings. The team forms a working group based on the DCS implementation plan and designates a responsible person. To shorten the upgrade time and restore boiler monitoring as quickly as possible, the technical staff from Hilscher along with those from the Electrical and Instrumentation Plant worked overtime and collaborated closely; it took only 4 days to complete the DCS and DEH upgrades for the 5 control stations. More than 3,400 meters of network cables were installed during this process. Meanwhile, the team took the opportunity to thoroughly clean all 7 cabinets of Boiler No. 3, from inside to outside and from top to bottom, in an effort to create favorable conditions for the stable operation of the DCS system. This also helped to gain time for the early startup of Turbine No. 2, earning recognition from the process management team. The boiler was started up on June 26; all personnel from the boiler urea monitoring team were on standby to assist with the start-up process, while technicians from the DCS manufacturer remained at the site. At 21:56 that night, Boiler No. 3 was successfully connected to the gas supply, and the dust collector system as well as the denitration system were brought online safely and steadily. Thus, Boiler No. 3 was successfully started up for the first time.