Usually, the steam pressure in a boiler is controlled through the use of a pressure control loop on the discharge line as shown in Figure Q-21. At the same time the water level in the boiler should not fall below a lower limit which is necessary to keep the heating coil immersed in water and thus prevent its burning out. On the same Figure below, modify the control system to satisfy this concern about the water level in the boiler. Boiler Heating coil Water ooooo Very hot gasses Discharge line PC PT Steam

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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Usually, the steam pressure in a boiler is controlled through the use of a
pressure control loop on the discharge line as shown in Figure Q-21.
At the same time the water level in the boiler should not fall below a lower
limit which is necessary to keep the heating coil immersed in water and thus
prevent its burning out.
On the same Figure below, modify the control system to satisfy
this concern about the water level in the boiler.
Boiler
Heating coil
Water
ooooo
Very hot gasses
Discharge line
PC
PT
Steam
Transcribed Image Text:Usually, the steam pressure in a boiler is controlled through the use of a pressure control loop on the discharge line as shown in Figure Q-21. At the same time the water level in the boiler should not fall below a lower limit which is necessary to keep the heating coil immersed in water and thus prevent its burning out. On the same Figure below, modify the control system to satisfy this concern about the water level in the boiler. Boiler Heating coil Water ooooo Very hot gasses Discharge line PC PT Steam
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