Furnace Improvements Services
www.heatflux.com 1
HOW TO BOOST THE
PERFORMANCE OF
FIRED HEATERS
Selective revamping
can hike thermal
efficiency and
capacity
A. Garg, Engineers India
Ltd.
A fired heater is an insulated
enclosure in which heat liberated by the...
More
Furnace Improvements Services
www.heatflux.com 1
HOW TO BOOST THE
PERFORMANCE OF
FIRED HEATERS
Selective revamping
can hike thermal
efficiency and
capacity
A. Garg, Engineers India
Ltd.
A fired heater is an insulated
enclosure in which heat liberated by the combustion of fuel
is transferred to a process fluid
flowing through tubular coils.
Typically, the coils are arranged along the walls and
roof of the combustion
chamber, where heat is transferred primarily by radiation.
Heat can also be transferred via
convection in a separate tubebank.
Revamping a fired
heater to recover energy from
its fluegas can be justified at
today's low fuel prices, even if
its heat duty is as low as 1million kcal/ h. A heater particularly one that is overfired -can also be changed
to make it operate at a higher
heat duty. The upper limit of
fired-heater thermal efficiency
is about 92% (LHV).*
Several revamping schemes
can improve fired heater performance. The major ones are
FIGURE 1.
Adding a convection sect
Less
