A brief about
Kettle type Reboiler
Operation and maintenance
By: A. Torkcherik
Reboiler main parts
CHANNEL HEAD
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SHELL
TUBE BUNDEL
Pass divider
CHANNEL HEAD
Pass divider divides channel head into 2 sections
Condense outlet
steam inlet
Dry steam comes into the inlet section and after heat
exchange and phase change through out tube bundle
leaves the condense section in liquid state.
Central hole is provided on Pass divider
in order to pressure balance between steam inlet and
condense outlet section and also vent the air during
hydrostatic pressure test.
The point that shown as damaged area are the result of
introducing liquid water with steam into the reboiler.
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Central hole
damage
SHELL
VAPOR OUT LET
BUNDLE SUPPORT
Cold liquid stream which fill up shell compartment till over
flow from wear as hot liquid, is coming through the cold
liquid inlet at the bottom of shell side.
Lighter components related to their boiling point and
vapor pressure leave the shell side from over head vapor
HOT LIQUID OUTLET
out let to the column.
WEAR
Hot liquid stream leaves the exchanger from hot liquid out
let which is provided behind the wear.
COLD LIQUID INLET
BUNDLE RAIL WAY
Bundle rail way and bundle supports are
control
any
unforeseen
bundle
provided to
movement
during
maintenance period or emergency operation condition.
Shell side and channel head are
prevent energy loss.
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usually insulated to
Baffles
TUBE BUNDLE
Steam is fluid that pass through the tube bundle in kettle type
reboilers.
There are 2 common reasons for tube failure in reboilers. Failure
due to corrosion, hot spot or hammering in result of bad
operation and failure due to bad maintenance during overhaul.
Bundle rail
Tube sheet
Tube failure will detect by hydro test after overhaul or observing
signs of failure during normal operation.
Observing shell liquid particles in steam condensate outlet
stream, increasing require steam flow, variable and hard to
control column profile are operational signs of reboiler tube
failure.
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Bundle rail failure
during overhaul
Incorrect support
arrangement on
tube puller.
BUNDLE PULLER
Device to pull out and put in tube bundle from / into shell side in order to maintenance and inspection
which is working with hydrolic power provided by diesel engine.
DIESEL ENGINE
Hydrolic
system joy
stocks
BUNDLE PULLER
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PIPING POT PHILOSOPHY
REBOILER WITH PIPING POT
REBOILER WITH OUT PIPING POT
COLD
CONDENSATE
TEMPRATURE
VALVE
BALANCING
VALVE
BALANCING
VALVE
WARM UP
VALVE
CHEMNY
TRAY
L.P STEAM
(4.5 – 5.0 bar
&175°C)
WARM UP
VALVE
CHEMNY
TRAY
DE SUPERHEATER
STEAM MAIN
VALVE
FLOW
VALVE
STEAM MAIN
VALVE
LAHH
PIPING POT
LAHH
LALL
LALL
FLOW
VALVE
TO STEAM
CONDESATE SURG
DRUM
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TO STEAM
CONDESATE SURG
DRUM
 Tube bundle should be submersed into process liquid before introducing steam to reboiler.
 Warmup valve must be switch on steam main valve immediately after dry steam observed from
steam header low points to prevent hammering.
 Desuperheater is provided for system in which a process liquid degradation is likely (EX. Amine
regeneration column). Since using desuperheater reduce ∆T between steam and process liquid,
condensate formation at condensate outlet of channel head is assured thus there is no concern
about passing live steam into the downstream in lock of piping pot.
 Piping pot provides a liquid seal prevent uncondensed vapor from blowing out of the reboiler in to
the condensate system that not only prevent hammering in condensate header but also by
increasing heat exchange time increases the use of steam latent heat and saves energy
consumption.
 Balancing line is using to equalize the ∆P between reboiler and piping pot (or steam condensate
surge drum) in order to facilitate flow from reboiler to piping pot (or steam condensate surge drum)
and also prevent backflow from piping pot (or steam condensate surge drum) in case of pressure
drop in inlet steam header.
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Thanks for watching
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