Process control of brewery plants
Sheng‐Luen Chung, Yen‐Hung Lai · Journal of the Chinese Institute of Engineers · 2008
Process control in a brewery plant deals with the open/close decisions of valves for pipelines in a brewery plant. Interleaved service requests for filtration and CIP (Clean in pipe) operations require exclusive usage of the associated sub‐routes for correct and safe operation. To maximize the pipe utilization, it is desired that non‐conflicting service requests be realizable simultaneously. Conventional approaches rely on experience and simulation from trial‐and‐error to derive a concurrency control map that dictates what service requests can be processed simultaneously. In contrast, this paper addresses the problem of concurrency control of the requests in the framework of EVALPSN. Pipeline utilization is divided into phases of: service request, permission, and execution. Safety constraints regarding mutual exclusive use of sub‐routes of the pipeline system are formulated in EVALPSN statements. With state variables reflecting the current status of the brewery pipe, non‐conflicting service requests can be derived by the rules dictated by the associated EVALPSN rule.