Boiler Controls (ABC02)

The second in a three-part comprehensive INVOLVE?? multimedia-training program. This program focuses on the control systems of boilers and teaches the importance of proper drum level.

Prerequisites

This lesson is designed for participants familiar with process operations and industrial process control.

Description

This lesson focuses on the control systems of boilers and teaches the importance of proper drum level and basic methods for controlling that level. Shrink and swell will be explained. Furnace draft control and basic control strategies for liquid, gas and solid fuel boilers will also be covered as well as the fundamentals of combustion testing. The lesson also provides information about steam temperature control and unit management systems.

Objectives

Explain the relationship between steam demand, feed water flow, and drum level. Identify the problems caused by low drum water level. Identify the problems caused by high drum water level. Explain the terms ??shrink? and ??swell? and their associated control problems. Identify the major components and functions in each of the following drum level control systems: single-element, two-element and three-element control systems. Identify the various sensors used to measure steam drum level in a highpressure drum boiler. Explain why steam drum level transmitters are density or temperature compensated and how this is accomplished. Describe the function of the demand loop. Describe the control systems used in solid fuel boilers. Describe the purpose of and basic steps for a Combustion test. Explain the purpose of controlling steam temperature. Identify the instruments and interconnections used to control steam temperature. Describe boiler-following unit control. Describe turbine-following unit control, and describe the coordinated unit control system.