Abstract:
Various components inside the boiler are required to promote efficient combustion and heat
transfer. Their design depends on factors such as the type of fuel and the method selected to
transfer thermal energy. The maximum power output from any thermal power plant is top
priority for engineers, and maximum power output means maximum loads which related to
maximum fuel consumption and air flow control system (A/F ratio). Vibration and noises
resulted from the over dose of air –fuel ratio in boilers is the main consideration of this
research project. The demands for electricity in peak-loads generate an unacceptable noise
and vibration. This research tries to find a solution for noise and vibration in the boilers when
operate on high load with high efficiency and safe mode for tools and operators.
Physical measurement of the vibrations in the boilers by measuring probes is difficult in the
running boiler due to high temperature. So, there is a need to evaluate vibrations in affected
regions theoretically. Computational Fluid Dynamics (CFD) tools have been found
appropriate to perform the flow analysis. Owing to recent improvements in CFD and by
analysis the type of air flow in the boilers component of air duct, wind-box and burners we
found the flow induced is the source of the noise and vibration, to reduce the effect of flow
induce inside the boiler system we used CFD modeling and by partition of the duct of the
inlet air for boiler number 5 by sheet metal and run ANSYS software before and after
partition the flow dramatically change after partition, then the solution install in boiler
number 5 therefore the problem was totally solve and the boiler operate with standard levels
of noise and vibration. The recommendation is to implement the same solution of partition
in boiler 3 &4 when the system is ready for installation of partition in the wind-box before
burners the flow induce will be eliminated and the boiler will operate on the high load
without noise and vibration.
