Cylindrical fire heater by Karwan K.Ahmed
Channel: Karwan Kamal
Date: 2020-09-16

Fired Heaters, as the name specifies are obviously heaters or furnaces. They are pieces of equipment used in processing facilities (refineries, power plant, petrochemical complexes, etc) to heat fluids up to the desired temperature. 


Refinery Process Heating Equipment for Crude Oil Production Plants. Process heating is a key component of crude oil production. From processing materials to pumping and transporting oil, many refinery processes rely on thermal fluid heaters and heating systems.


Components of a Fired Heater
A fired heater consists of:

Casing
Tubes
Return bends
Tube supports
Burners
APH/SAPH
ID & FD fans


Types of Fired Heaters with Different Coil Arrangements
Type A-Box heater with arbor coil
Type D-Box heater with vertical tube coil
Type E-Cylindrical heater with vertical coil
Type F-Box heater with horizontal tube coil

Fuel Components
Gas, Oil and Coal are all basically a mix of
Hydrocarbons.
During combustion these break down progressively
as some parts burn more easily.
The most important components are Carbon and
Hydrogen compounds.

Heat Transfer(a) - Radiation
In the firebox we get heat transferred initially
by direct radiation from the flames to the tubes.
Additional heat is radiated to the back of the
tubes from the hot furnace walls.
Radiant efficiency depends on the emissivity of
the flame and of the tube surfaces, plus the
temperatures of both.


Heat Transfer(b) - Convection
Hot gases passing over tube surfaces heat the
tubes mainly by Convection.
Away from the Flames most heat is transferred by
Convection.
A Convection Bank is a section of the Heater
where Radiation is insignificant, normally just
below the Stack.



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