Identifying the Issue of Reducing the Emission of Harmful Compounds in the Exhaust Gas from Marine Main Engines and Description of the Emission Process of These Compounds in Probabilistic Approach

The article discusses the results of actions performed by marine engine manufacturers towards the reduction of emission of harmful substances in the exhaust gas from these engines. The discussion is limited to main engines produced by MAN B&W. A model is proposed to describe the process of emission of harmful substances from Diesel engines based on the semi-Markov process, discrete in states and continuous in the operating time. The states of this process are: engine ability state (s₁) and engine inability state (s₂). A method to calculate probabilities P₁ and P₂ of the appearance of states s₁ and s₂ is proposed. State s₁ is interpreted as corresponding to the inequality e_k<e_k(dop), while state s₂ is characterised by the inequality e_k>e_k(dop), where e_k represents the mass of harmful substances emitted by the engine during its operation and e_k(dop) is the maximum mass of emission of these substances permitted by relevant regulations.