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Boilers And
Burners
Comprehensive CFD Simulation
of the
Combustion
Chamber of
SHAZAND Power
Plant Boiler
This project
was performed in
2012 with the
goal of
comprehensive
analysis,
including CFD
simulation of
combustion and
pollution for
boiler
combustion
chamber in
different
operating
conditions. This
325 MW boiler
has a front and
rear walls each
include 12
burners. At the
first step wind
box was
simulated. Using
wind box
simulations the
static pressure
for each 24
burners due to
non-uniform
distribution of
air was
specified. Then
with a precise
model and mesh
generation of
burners, the
percent of air
distribution in
primary,
secondary and
tertiary airways
was specified.
With the air
mass flow rate
for each burner
and the
percentage of
distribution in
each airways,
including burner
guide vanes, a
comprehensive CFD simulation
for combustion
chamber was
executed. Based
on studies the
effect of
different
operating
parameters such
as GR fan was
specified. After
a complete
study, various
strategies for
air pollution
reduction and
combustion
chamber
optimization
were carried out
and a deep
insight into
boiler design
and optimization
was produced in
Arya Alborz
Company.
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Comprehensive CFD Simulation
of SHAZAND Power
Plant Burners
This project was
performed in
2012 to specify
the percentage
of air
distribution in
primary,
secondary and
tertiary airways
in a burner. At
first step a 3D
model of burner
was created and
a proper mesh
was generated.
Then using CFD
simulations the
combustion and
air distribution
in different
airways at
various inlet
static pressures
were carried
out. These
simulations were
executed as a
primary step for
a precise and
comprehensive
simulation of a
325 MW boiler
combustion
chamber.
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Comprehensive CFD Simulation
of a 325 MW
SHAZAND Boiler
Wind Box
This project was
performed in
2012 to specify
the air
distribution and
static pressure
at the inlet of
each 24 burners.
After a 3D
modeling and
mesh generation,
air flow
distribution was
simulated. Based
on aerodynamic
design of ducts,
significant
non-uniformity
of air flow
distribution
(300%) in 24
burners was
observed. The
lack of
formation of the
stoichiometric
combustion,
results in the
production of
air pollution.
Also increasing
the air flow
rate leads to an
increase in
flame length in
some burners,
flame
inclination
towards some
water walls and
resulting in
overheating,
burning and
destruction of
the water walls.
Due to the poor
design of wind
box,
optimization for
resolving the
problems was
carried out with
Arya Alborz
engineering
group.
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Comprehensive CFD Simulation
of a Three pass
Fire Tube Boiler
This project was
performed with
the aim of
simulation and
optimization of
a three pass
fire tube boiler
in 2013. At
first step the
geometry of a
three pass fire
tube boiler with
a capacity of
25,000 lbs/hr
was created.
After the 3D
modeling a
professional
mesh was
generated. Then
by applying the
air and fuel
mass flow rates
as inlet
boundary
conditions,
fluid flow and
combustion were
simulated. Using
precise CFD
simulations the
percentage of
convection and
radiation heat
transfer in
first, second
and third pass
of boiler were
specified. In
second step the
optimization for
higher
performance was
provided.
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Comprehensive CFD Simulation
of a Steam
Reforming
Reactor at
TEHRAN Refinery
This project was
performed in
2006 for a
complete
performance
analysis of the
reactor and to
specify the
optimum
condition for
burner
combustion.
Generally,
hydrogen is used
in various
industries for
reduction. For
hydrogen
production in
refineries,
water vapor and
methane, flow in
tubes filled
with catalysts.
The heat is
transferred from
outside of tubes
from the flame
formed by
combustion of
gas in a counter
flow manner. The
formation of
chemical
reactions inside
the reactor is
so important.
Heat transfer
reduction to the
feed, reduces
the reactor
performance and
flame length
extension can
lead to bending
and deformation
of the reactor
tubes. Due to 12
meters height of
reactor, pipes
replacement
requires unit
shut down and
imposition of
heavy costs. As
target of this
project the fuel
and air ratio
and mass flow
rates were
adjusted to
efficiently
transfer the
heat for desired
chemical
reaction inside
the reactor and
to prevent the
pipe bending and
destructions.
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Combustion
Simulation Using CFD Techniques
in a Gas Heater
This project was
performed in
2003 to study
the effect of
geometric
parameters on
the performance
of a gas heater
for
optimization.
After 3D
modeling and
mesh generation,
flow
distribution and
combustion were
simulated and
the effect of
geometric
parameters for
optimization was
carried out.
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