If a computer is incorporated into the control scheme, it can be programmed to analyze the process continuously and optimize operating conditions. If a computer is not an integral part of the control scheme, a company can per form offline analysis and use it as a guide for setting process conditions (Nelson 1990).
AUTOMATING START UPS, SHUTDOWNS, AND PRODUCT CHANGEOVERS
Large quantities of waste are produced during plant start ups, shutdowns, and product changeovers, even when these events are well planned. Programming a computer to control these events brings the plant to stable operating conditions quickly and minimizes the time spent generating off-spec products. In addition, since minimum time is spent in unwanted running modes, equipment fouling and damage are reduced.
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