| Abstract:In the context of Industry 4.0 and green sustainable development, the paper industry has ushered in a golden period of transformation and upgrading. However, currently most paper mills have poor emission reduction and decarbonization effects, and their level of informatization is relatively low. In view of this, this article takes the alkali recovery section as an example and proposes an intelligent control system for alkali recovery based on a dual network and dual server architecture. The system is based on a dual ring Ethernet dual redundant server architecture, with Siemens S7-400 series PLC controller selected as the lower computer. Hardware such as CPU and I/O modules are designed with redundancy, providing stable and reliable decentralized control for alkali recovery, evaporation, combustion, and causticization sections; The upper computer is equipped with Web server, enterprise office Internet and remote service channel, which can not only enhance the information sharing capability within the system, |