PROCESS CONTROL TRAINING— SIMULATORS ARE ONLY HALF THE STORY
PERFORMANCE ASSOCIATES INTERNATIONAL
With reference to greenfield
plant projects, using process simulators similar to the
designed plant Human-Machine
Interface (HMI) or Distributed Control System
(DCS) has become common practice.
These simulators represent a “virtual plant”
based on process modeling of the
circuit chemistry and thermodynamics, and on the
physical nature of the plant,
including equipment, valves, piping, etc. The virtual
plant allows trainees to
troubleshoot problems, optimize process variables, react to
alarms, etc., all based on the
process simulation model.
Performance Associates’
experience is that this complex simulator training is valuable,
but only after more in-depth
training on the process and control logic. To truly
optimize a process plant, prior
to simulator training, the control room operators must
have detailed knowledge of the
following:
Process
objective of each process system, comprising a group of unit operations.
Process
objective of each unit operation.
Process
chemistry and the variables affecting it.
Important
characteristics of each unit operation, the variables affecting it, and the
impact on downstream unit
operations.
Plant
control loops, interlocks, and alarms.
Safety
issues related to the process and control schemes.
Operating
procedures for start-up and shutdown under various scenarios, as well
as important operator tasks.
Additionally, trainees must be
intimately familiar with the applicable fundamental
scientific concepts, such as
pressure, temperature, heat exchangers, electricity, PID
control logic, combustion, etc.
With this fundamental and plant-specific foundation,
the process simulator
can be fully exploited for training.