Improving Consistency Control, 18PaperCon

Paper machines are being made bigger and faster than in the past.  Older machines are being stretched beyond design production to keep pace.  Pumps and other process equipment have become more efficient as Energy cost management has become more important. In short: bottom line profitability demands more from operations and the process.  How should your mill’s fundamental control of consistency change to keep up?  What steps can be taken to optimize control in this new environment?

As many mills migrate to pumps, drives and motors that are more energy efficient, changes occur in process conditions that can adversely affect consistency control.  These changes to throughput, pumping, mixing and control type have an impact on dilution capacity, agitation, and injection properties that can impact the mixing of stock and dilution water.  Without understanding the impact of these conditions, they may not be getting mixed properly.   

Understanding your current capabilities and the options that exist are critical to knowing how to proceed.   For example, some mills use standard consistency control, while others have started to control consistency by using dilution flow.  Each of these choices has pros and cons.  Understanding this choice, along with injection nozzle design and current dilution capacity will be covered in this discussion.  It can provide a starting point to aligning consistency control with the current conditions in your mill. 

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