1. School: OLFU VAL Course:
PPS311
Instructor: C/E Ballester
THE FUNCTION
AND THE FLOW OF
AN EXHAUST GAS
BOILER
Talents come from diligence, and
knowledge is gained by accumulation.
3. The flow of a marine exhaust gas boiler
system in conjunction with an oil-fired
boiler, steam drum, circulating pumps,
feedwater pumps, hotwell, exhaust gas
boiler evaporator, atmospheric surplus
condenser, and the production of
saturated steam for heating services
can be quite complex.
01
FLOW OF EXHAUST GAS BOILER
4. process begins with the exhaust gases produced by the
steam engine. These hot exhaust gases contain waste
heat and are directed into the exhaust gas boiler system.
01
FLOW OF EXHAUST GAS BOILER
The exhaust gas flows over the tube stacks and heats the water,
thus producing steam. The main constituent of the soot deposit is
particulates but in addition, some unburnt residues of fuel and
lubricating oils may be deposited in the boiler.
5. 01
FLOW OF EXHAUST GAS BOILER
•The hot exhaust gases flow through the tubes of the exhaust gas boiler evaporator. This is
where heat is transferred to a heat transfer medium, such as water, which turns into steam.
The steam produced in this stage is often referred to as "low-pressure steam."
•Circulating Pumps: To maintain a continuous flow of water or heat transfer
medium through the exhaust gas boiler evaporator, circulating pumps are used.
Then The low-pressure steam generated in the exhaust gas boiler
evaporator is then collected and directed to a steam drum.
•Feedwater pumps are responsible for delivering cool and treated water into the
steam drum to maintain the desired water level and steam quality. This water is often
chemically treated to prevent corrosion and scale formation.
6. FLOW OF EXHAUST GAS BOILER
The condensate that forms as the low-pressure steam gives up its heat is
collected in a hotwell. The hotwell also receives condensate from other
sources, such as various steam users or equipment in the vessel.
The excess or surplus low-pressure steam, which is not used for propulsion or
power generation but is still valuable, can be condensed in an atmospheric
surplus condenser.
The entire system is designed to recover waste heat from the exhaust gases
of the main engine, convert it into steam, and make efficient use of this steam
for various applications, including propulsion assistance and heating. It's
important to maintain the proper balance of water and steam in the system
and to manage heat transfer effectively for optimal performance and fuel
efficiency.
