10 ANDRITZ
Pulp Paper & Logistics
Figure 2: The yellow dots are the lab data points. The plot represents 82 data points at 15-minute intervals. The IDEAS Virtual Instrument predicts the percentage of solids in the evaporator (blue trace). The plot represents 82 data points at 15-minute intervals. Virtual Instrument value for heat transfer coefficient with time. The decline in value reflects fouling of the evaporator surfaces. The plot represents 82 data points at 15-minute intervals.
alongside the mill’s operation using real-time data. The results provided can be applied for condition monitoring and optimized decision-making.
Using Digital Twins in real time Connecting the Digital Twin applications to real-time operations is what truly unlocks the full potential of the Andritz Digital Twin solution. Consider the evaporation process in a pulp mill (Figure 2). The virtual model of the pulp mill is connected to the mill’s real-time operation. The IDEAS Guardian application uses this replica to detect any undesired conditions such as fouling and scaling, and is also used to take virtual measurements that are not accessible in the real world using conventional instrumentation.
January/February 2019
Operational evaporation data on pressure, temperature, and flow are the inputs in real time, and IDEAS Guardian outputs virtual instrument information to the operator screens, including heat transfer coefficients and predicated evaporator percentage solids, DeltaTs, BPRs per effect, heat and mass balance, and production levels. The IDEAS Guardian uses this virtual instrument data to enable operators to continuously analyze fouling of heat transfer surfaces, guiding them by providing the optimal cleaning frequency. In the case of a physical instrument failure, the IDEAS Guardian can be set to automatically input values from that instrument’s virtual twin into the control system, bypassing the need for manual input and thereby eliminating any disruption of operation.
You could compare the concept and function of the Andritz Digital Twin architecture to that of a smartphone. The IDEAS simulation software and first- principle model are like the phone itself and its hardware, systems, and circuitry. The Andritz execution platform is like the operating system, the iOS or Android, that allows the phone’s functionality to be accessed as well as connected to other systems and devices. The Digital Twin applications are the mobile “apps”. Through the operating system, the ‘apps’ draw on specific functions, connections, and data to either perform a specific task or generate a specific result. The trajectory of the pulp and paper industry continues towards Industry 4.0 as more and more mills integrate new
and cutting-edge technologies into their operations. Digital Twin technology can greatly enhance the efficiency, cost-effectiveness, productivity, and profitability of pulp mill operations, and industry- leading systems, like IDEAS, that combine high-fidelity models with real-time connectivity and an advanced operating platform, are poised to take those operations to the next level. More information from www.
andritz.com/metris or Sohail Nazari at
sohail.nazari@andritz. com References: [1] M Shafto, M
Conroy, R Doyle, E Glaessgen, C Kemp, J LeMoigne, and L Wang, “Draft modeling, simulation, information technology & processing roadmap,” Technology Area, vol. 11, 2010; [2] https://
www.gartner.com/doc/3865406/ top--strategic-technology-trends
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