Exhaust gas treatment system and method

A nozzle for injecting a powder into exhaust gas of an engine of a vessel, comprising:

• a conduit configured to transport the powder;
• and
• a conical member mounted to a distal end of the conduit and defining a central hole in fluid communication with the conduit for guiding a first portion of the powder through the central hole, wherein the distal end of the conduit and the conical member together define an annular gap configured to guide a second portion of the powder through the annular gap.

A dosing assembly for treating an exhaust gas of an engine of a vessel with a powder, comprising:

• a bottom dosing unit containing one or more blowers configured to fluidly couple to one or more flow lines;
• a plurality of storage containers stacked on top of the bottom dosing unit and configured to store the powder, wherein the plurality of storage containers are in selective fluid communication with the bottom dosing unit, and the bottom dosing unit is configured to meter out doses of the powder for injection into the exhaust gas of the engine.

A system for treating exhaust gas of a vessel having at least two engines respectively equipped with a turbocharger, wherein the exhaust gas includes main exhaust gas from a main engine and auxiliary exhaust gas from one or more auxiliary engines, the system comprising:

• a storage tank configured to store a powder for treating the exhaust gas;
• and
• a dosing assembly fluidly coupled to the storage tank and fluidly coupled to a plurality of exhaust pipelines that carry the main exhaust gas and the auxiliary exhaust gas, wherein the dosing assembly is configured to inject the powder into the exhaust gas at or adjacent each respective turbocharger.