Most utility systems have common elements, including similar“handles”or variables for
optimization. In particular, many steam system elements are common from site to site.
Steam venting and steam letdown from a higher to a lower pressure header are
typical and are often useful optimization handles that can provide significant savings.
Since letdowns and vents are not typically under the direct control of operators, changes
to other equipment under the operators’direct control are required in order to affect them.
A common way to change the letdowns and vents is through switching between
pairs or groups of steam-driven and electric motor-driven pumps in shared services. By
selecting the most appropriate of these machines to run at any given time, the operator
can do much to minimize vents and letdowns. For instance, starting a steam turbine-driven pump to replace a motor-driven pump can reduce an open steam letdown, if the
inlet and exhaust headers are the same for both the turbine and letdown. The benefitis
seen in reduced electric power consumption. This concept is discussed in more detail in
Chapter 18.
Figure 19.3 illustrates the reduction in letdown and vent provided by site-wide
optimization. The numbers next to the bold gray lines indicate the difference inflow
between the starting point and the optimized solution recommendations. The turbine-driven
Most utility systems have common elements, including similar“handles”or variables foroptimization. In particular, many steam system elements are common from site to site.Steam venting and steam letdown from a higher to a lower pressure header aretypical and are often useful optimization handles that can provide significant savings.Since letdowns and vents are not typically under the direct control of operators, changesto other equipment under the operators’direct control are required in order to affect them.A common way to change the letdowns and vents is through switching betweenpairs or groups of steam-driven and electric motor-driven pumps in shared services. Byselecting the most appropriate of these machines to run at any given time, the operatorcan do much to minimize vents and letdowns. For instance, starting a steam turbine-driven pump to replace a motor-driven pump can reduce an open steam letdown, if theinlet and exhaust headers are the same for both the turbine and letdown. The benefitisseen in reduced electric power consumption. This concept is discussed in more detail inChapter 18.Figure 19.3 illustrates the reduction in letdown and vent provided by site-wideoptimization. The numbers next to the bold gray lines indicate the difference inflowbetween the starting point and the optimized solution recommendations. The turbine-driven
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