Reduction of Nitrogen Oxides (NOX's) from the Exhaust Gasses
It is necessary to lower the exhaust gas temperature to minimize Nox emition.
this can obtained by several methods.
1. Injection water plus fuel in to combustion chamber.
2. Exhaust gas flow through the scrubbers.
3.Engine running with economical speed hence reduce exhaust gas temperature.
Nitrogen oxides are a product of the combustion of HFO in air, and between 5% and 8% of these are removed by the scrubbers.
One way to reduce this further is to raise the thermal efficiency of the engine by using common rail fuel injection and running the engine at a more economical speed, reducing the fuel consumption.
OPTIMIZE EXHAUST GAS
Engine Room Efficiency Improvement Components
Exhaust Gas Waste Heat Boilers Exhaust gas waste heat boilers are nothing new; we had them in the engine rooms in the 1960’s.
What is new though is that modern exhaust gas boilers have been designed to produce superheated steam as well as saturated steam.
The saturated steam is used for accommodation utilities and numerous engine room heaters.
Steam Turbine Generator The superheated steam is piped to a steam turbine coupled to a power generator that can have an output up to 8MW.
Because of the more efficient main engine, about 10% of the exhaust gasses can be diverted before the turbo blowers.
These gasses are redirected to an exhaust gas turbine connected to the steam turbine drive shaft.
A clutch allows the exhaust turbine to be connected or disconnected from the main drive as required. The condensed steam from the turbine is reheated by being passed through the jacket water and lube-oil coolers before returning to the boiler.
Electric Drive
The last innovation of the efficient engine room is the coupling of one or two electric motors to the main engine prop shaft.
These can be supplied by the steam turbo generator or one of the auxiliary diesel generators.
typically efficient and environmentally friendly engine
.. MAN/B&W and Sulzer/Wartsila, the remaining major engine manufacturers, have spent a lot of time in research and development of these engines and their engine rooms.
It is necessary to lower the exhaust gas temperature to minimize Nox emition.
this can obtained by several methods.
1. Injection water plus fuel in to combustion chamber.
2. Exhaust gas flow through the scrubbers.
3.Engine running with economical speed hence reduce exhaust gas temperature.
Nitrogen oxides are a product of the combustion of HFO in air, and between 5% and 8% of these are removed by the scrubbers.
One way to reduce this further is to raise the thermal efficiency of the engine by using common rail fuel injection and running the engine at a more economical speed, reducing the fuel consumption.
OPTIMIZE EXHAUST GAS
Engine Room Efficiency Improvement Components
Exhaust Gas Waste Heat Boilers Exhaust gas waste heat boilers are nothing new; we had them in the engine rooms in the 1960’s.
What is new though is that modern exhaust gas boilers have been designed to produce superheated steam as well as saturated steam.
The saturated steam is used for accommodation utilities and numerous engine room heaters.
Steam Turbine Generator The superheated steam is piped to a steam turbine coupled to a power generator that can have an output up to 8MW.
Because of the more efficient main engine, about 10% of the exhaust gasses can be diverted before the turbo blowers.
These gasses are redirected to an exhaust gas turbine connected to the steam turbine drive shaft.
A clutch allows the exhaust turbine to be connected or disconnected from the main drive as required. The condensed steam from the turbine is reheated by being passed through the jacket water and lube-oil coolers before returning to the boiler.
Electric Drive
The last innovation of the efficient engine room is the coupling of one or two electric motors to the main engine prop shaft.
These can be supplied by the steam turbo generator or one of the auxiliary diesel generators.
typically efficient and environmentally friendly engine
.. MAN/B&W and Sulzer/Wartsila, the remaining major engine manufacturers, have spent a lot of time in research and development of these engines and their engine rooms.
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