11-04-2012, 11:02 AM
SIMULATION OF MODERN STEAM POWER PLANT
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Introduction
By far the greater part of the mechanical and electrical energy generated
for industrial purposes is furnished by steam power plant. Despite the
rapid progress of the internal combustion engine and the intensive
development of water power, the steam power plant still leads the field in
power generation and will probably continue to do so for years to come.
The function of steam power plant is to convert the raw energy (chemical)
in fossil fuels (coal, oil, gas) into mechanical or electrical energy through
the expansion of steam from a high pressure to low pressure in a suitable
prime mover.
Modeling and Simulation of Thermal System
Modeling is one of the most crucial elements in the analysis of thermal
systems. Practical processes and systems are generally very complicated
and must be simplified through idealization and approximations to make a problem solvable.
Curve fitting
Curve fitting is an important and valuable technique that is used
extensively to represent the characteristics and behavior of thermal
systems. It is a means by which tabular or graphical information can
be readily assimilated into a component model or a system
simulation. Functional form of curve fit selection is perhaps the most
crucial decision made in the curve fitting process since an
inappropriate choice of functional form invariably results in a less
than adequate curve fit. The simplest curve fitting form is the linear
equation:
System Simulation Technique
The information and the techniques presented in the preceding section
have barely scratched the surface of curve fitting and interpolation. They
do, however, provide a convenient way to model hardware performance
characteristics; and while much sophisticated techniques are available
where higher accuracy is required, the results of the more sophisticated
techniques are utilized in the same manner by the two simulation
procedures.