The APC control system for the first boiler at Shaanxi Chemical Industry has officially entered the trial operation phase

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The APC control system for Shaanxi Chemical Industry’s first boiler has officially entered the trial operation phase. Author/Source: Shaanxi Chemical Industry. Date: November 19, 2021. Clicks: 15. On November 16, the APC control system for Shaanxi Chemical Industry’s first boiler completed its intermediate handover and officially entered the trial operation phase, marking a significant step forward in making the control system of Boiler No. 3 more intelligent. The DCS control system for Boiler No. 3 uses the HANGZHOU HOLI TECH M5 system, while the APC system employs HOLI TECH’s HOLLiAS APC system. The implementation of this APC system involves deploying an APC server separate from the DCS system; the APC server exchanges data with the DCS system via HOLI TECH’s proprietary communication protocol. The data collected by the DCS system is processed in the APC server, and the resulting control commands are sent back to the DCS system to operate the field devices. The entire system achieves closed-loop control with no need for operation. By the early hours of November 15, all circuits were connected to the APC system. Once the APC system was in operation, Boiler No. 3 was able to respond automatically, promptly, and accurately to changes in external load through this system. Furthermore, after APC control was implemented in Reactor No. 3, the key operational parameters such as main steam pressure, furnace negative pressure, and steam temperature all became stable. Compared to manual comparison, the range of parameter fluctuations is significantly reduced, and the workload associated with manual operations is greatly diminished. At the same time, after Unit 3 was equipped with the APC system, Units 1 and 2, functioning as pressure-regulating units, were hardly operated, which suppressed the natural vibration of the boilers and reduced mutual interference between them. The goal of steam stability has been achieved. By introducing another stage of desuperheating water under APC control, the interference resistance is improved; no manual intervention is required during soot blowing, allowing the steam temperature to remain within the specified range. The operation of the APC system reduces the workload associated with manual operations, leads to more stable parameters, and also helps achieve energy savings. Preliminary estimates suggest that coal consumption can be reduced by 0.5% per boiler; this figure is expected to increase further as some of the self-regulating valves in the system are replaced or repaired. Under the trends of the \"dual carbon\" policy and intelligent manufacturing, energy conservation and emission reduction are important goals at present. The successful completion of the APC control system for the company’s No. 3 boiler marks an important step forward in the intelligent development of Shaanxi Chemical Industry. The successful operation of this system has boosted confidence in intelligent development, and it will also help the company move forward more steadily and effectively in the integration of information technology and industrialization.