Boiler Safety Improvement For Safety Controls
Utilizing Flow Measurement For Input
Author(s)
D. F. Dyer
Abstract
This paper describes a very interesting industrial safety problem and its
solutions. Currently, boiler safety controls utilize pressure drop across various
boiler elements in an attempt to guarantee adequate combustion air flow, purge
air flow, and atomizing media flow. This paper describes various practical
situations where these flow measurements are inadequate. Various alternative
measures are described to mitigate the problems presented. The paper should
serve as a basis for complete re-thinking on these safety controls on both power,
industrial, and commercial boilers.
Keywords: boiler, safety control, flow measurement.
1 Introduction
A typical industrial or steam boiler utilizes approximately 50 different alarms
and interlocks to satisfy safety for automatic operation. Some of these interlocks
require that flow rate be measured and compared to a minimum requirement.
There are two kinds of interlocks that are used in the boiler safety control
system: 1. pre-ignition or start-up interlocks and 2. running interlocks.
The start-up interlock monitors the pertinent parameter only during start-up
and once that parameter is satisfied it allows the boiler to continue in the start-up
sequence. Running interlocks are active once the boiler begins firing. These
interlocks use a continuously measured signal to shut the boiler down if the
pertinent measured parameter does not meet its requirement. A running interlock
interrupts boiler operation by causing the closure of two automatic fuel shut off
valves. A pre-ignition interlock causes the safety control system to return the
boiler to its initial start-up position. Three of these controls are considered in
this paper. For each of these controls, the system is described, the problems are
Keywords
boiler, safety control, flow measurement.
Related Book
Other papers in this volume
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