At the end of this lesson, you will be able to describe the basic design and function of a boiler-following instrumentation and control system. • Discuss the basic operation of a boilerfollowing DCS • Explain how changing power plant load affects steam temperature, pressure, and flow • Describe how the DCS maintains parameters at their designed values when unit load changes • Discuss the relationship between the following: – Fuel flow and associated unit parameters – Fuel flow, furnace draft, air flow, and excess oxygen – Feedwater flow, steam flow, unit load, and boiler drum level • Identify operator responsibilities in controlling key operating parameters, systems, and equipment during normal operation
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