Experimental Method for Marine Engine’s Emissions Analysis

The world is considering various solutions to reduce exhaust emissions, the use of alternative fuels and the development of more efficient marine engines. IMO the company gave guidance for future borders of individual exhaust components, taking into account a variety of applications and conditions for the operation of marine engines. Engine manufacturers have been forced to develop new technologies, to meet the existing IMO rules and regulations that are yet to come, for the emission of harmful exhaust emissions.This paper describes the experimental procedure that support the modeling of the operating parameters of marine internal combustion engines in order to diagnose the condition, optimization of engine and reduce exhaust emissions. Special attention was given to verify the adequacy of the investigation, its accuracy and relevance. It outlines experiments that support the selection procedure tests during sea trials and later in the exploitation of the ship

Expert System for Diagnosis and Optimisation of Marine Diesel Engines

The doctoral, thesis: “Expert System for Diagnosis and Optimisation of Marine Diesel Engines” is the result of many years of extensive practical and theoretical work on problems in the field of testing marine diesel engines and incorporating new technology during diagnosis. This work deals with problems of a complex analysis and testing a system of Diesel engine parameters, pointing out engine working cycle characteristics. The Expert system - EKSE has been developed to analyze and to research engine behavior especially regarding the working cycle and diagnostic system of engines and to optimize engine performance as well as increase efficiency. EKSE includes corrections of parameters under standard ambient conditions by a method developed on the basis of ISO standards. A diagnostic model has been developed for application in marine slow-speed, 2-stroke Diesel engines. A thermodynamic analysis of the working cycle has been carried out on the engines with direct injection. From the results, conclusions about the engine working cycle efficiency have been drawn, showing also the possibility of how to obtain optimizations. The most important results of combustion process have been compared using the correlations by Vibe and Watson-Piley-Marzouk. An expert system of diagnosis and control of Diesel engines gives results of the analysis of important parameters for a 2-stroke marine Diesel engine which serves as a basic technological know-how. EKSE could give best results during implementation on the newly developed, electronically controlled marine engines. * Defended Doctoral Thesis (2004.

Engine Working Cycle Analysis for Diagnostic and Optimisation Purposes

In this paper the most relevant engine characteristics have been determined and the analysis of diesel engine working process through the elaboration of the indicated pressure diagrams has been done1. Relevant characteristics have been calculated and an analysis of the obtained indicated pressure diagrams during engine exploitation has been performed. The obtained results provide the possibility for evaluation of the engine working cycle effi ciency and further engine performance optimisation. Today’s development of electronically controlled engines and diagnostic equipment enables the control and precise setting of relevant parameters that are important in engine process optimisation such as fuel injection, air inlet and exhaust, lubrication, cooling, etc

Thermodynamic Analysis of Marine Two Stroke Diesel Engine Combustion Process

This report deals with a method of working fluid availability analysis during combustion process in a cylinder of a marine two-stroke compression the ignition engine. The model, used in this report, is able to detect exact positions of working fluid availability destruction, due new possibilities to prevent such destruction and to increase efficiency of the thermodynamic combustion process. A unique thermodynamic approach to combustion process in compresion ignition engine is obtained and described by a zero – dimensional two – zone mathematical model. There is also the possibility, using this method, to calculate all thermodynamic values including entropy, and based on this possibility realistic indicated work values can be obtained. Also availability destruction can be detected, which is caused by irreversibility in the combustion process. A two-stroke compresion ignition engine for ship propulsion is analyzed by this method, with a 84 % load. The calculated values are shown in following diagrams: u-s, u-φ, s-φ and ΔWindic,ΔQ-φ and availability destruction positions are located. A computer simulation program shown in this thesis can be used for two stroke marine compression ignition engine optimization and for further development and thermodynamic analysis of combustion process

Performance Simulation of Marine Slow-Speed Diesel Propulsion Engine With Turbocharger Under Aggravated Conditions

The paper elaborates a mathematical model forming the basis for a computer-simulated model for a diesel propulsion engine. The model is applied in the analysis of steady and transient operating conditions of a turbocharged slow-speed diesel propulsion engine and a fixed blade propeller. Special attention has been paid to examining the stability and availability under aggravated operating conditions such as difficulties in scavenging and turbocharging system. The analysis of the results has established ultimate limits of affecting features and has defined safe operating conditions, in particular those of the turbocharging system. The analyses and the model can be used in finding better design characteristics and in expert operating systems which can analyse different conditions of the system beforehand and offer optimum operating conditions in order to prevent unwanted occurrences

SUPERCHARGED ENGINE USING TURBINE STANDALONE EXHAUST GAS RECUPERATION SYSTEM

This paper presents a new hybrid concept that increases the overall efficiency of the propulsion system on ships. The hybrid concept of the marine propulsion system was examined in 1D CFD internal combustion engine model where the turbine and compressor are not mechanically connected. Such a configuration makes possible different turbine designs than needed in the conventional turbocharger. The advantage is an increased recuperation of energy from exhaust gases. By means of computer simulation and optimization, this study proves that the hybrid concept significantly increases the propulsion system efficiency and lower emissions in maritime environment

ANALYSIS OF EXHAUST GAS EMISSION IN THE MARINE TWO-STROKE SLOW-SPEED DIESEL ENGINE

This paper explores the problem of exhaust emissions of the marine two-stroke slow-speed diesel engines. After establishing marine diesel engine regulations and defining the parameters influencing exhaust emissions, the simulation model of the marine two-stroke slow-speed diesel engine has been developed. Furthermore, the comparison of numerical and experimentally obtained data has been performed, resulting in achieving the model validity at 100% load, which represents a requirement for further exhaust gas analysis. Deviations obtained at the real engine and the model range from 2% to 7%. An analysis of the influential parameters such as compression ratio, exhaust valve timing and fuel injection timing has been performed. The obtained results have been compared and conclusions have been drawn

Intelligent Diesel Engine Expert System

Neizbježnom upotrebom računala i same automatizacije brodskoga propulzijskog sustava, došlo se do velikog broja mogućnosti poboljšanja njegova rada. Ekspertni sustavi u ovom području imaju veliki utjecaj na daljnji razvoj upotrebe računala na brodovima. Izbacivanjem bregaste osovine i njezinom zamjenom visokotlačnom pumpom promjenjiva vremena dobave (VIT) postiže se optimalno vrijeme ubrizgavanja goriva u cilindar u različitim režimima rada. Daljnja prednost VIT- -pumpe je ta što se tijekom rada motora nesmetano mogu ugađati raznovrsni parametri (vrijeme ubrizgavanja, stupnjevano ubrizgavanje goriva u cilindar...) i tako optimizirati ubrizgavanje goriva u cilindar. U radu je prikazano idejno rješenje upravljanja VIT-pumpom s pomoću ekspertnog sustava radi određivanja optimalnog kuta pri ubrizgavanju goriva. Rezultati simulacije pokazuju opravdanost upotrebe ovakva sustava na brodovima.The inevitable computerisation and automation of the shipboard propulsion system have given rise to an increasing number of possibilities of improvements in its operation. This is the area in which the expert system has made an enormous impact upon the further employment of computers aboard the ship. By eliminating the camshaft and replacing it with a high-pressure variable injection time pump (VIT) an optimum injection time in a variety of operating modes has been achieved. A further advantage of VIT pump is that various parameters can be easily adjusted during engine operation, e.g. time of injection, gradual injection, etc., seeking thereby an optimum injection mode. The paper deals with a conceptual solution concerning with the VIT pump operation by means of expert system, aimed at determining an optimum angle of fuel injection. The results of simulation hereby presented clearly justify the employment of such a system aboard the ship

Failure Diagnostics of Marine Engine Fuel Supply System

Sustav goriva brodskih motora opisujemo kao jedan od osnovnih, a da pritom moramo biti i svjesni njegove višestruke uloge, ekonomske, ekološke i energetske. Razvoj i poboljšanje sustava kretala su se u više različitih smjerova. Teži se tome da razina sumpora u gorivu stremi prema nuli uz konstantnu regulaciju TBN ulja, usto je gorivo bolje pročišćavano, uvedeno je ubrizgavanje emulzije goriva i vode u cilindar motora, razvijaju se i ugrađuju SCR (selective catalytic reduction) katalizatori ispušnih plinova, razvijaju se motori s mogućnošću rada na dvojno gorivo i uvode se inteligentni motori. Takvi su motori sposobni nadzirati parametre motora, dijagnosticirati stanje i rješavati probleme u realnom vremenu bez ljudskog utjecaja.A marine engine fuel system is described as one of essential, yet we have to be aware of its complex role on today’s marine market, economically, ecologically and energetically. Improvement is developed in many different ways. Sulphur oil amount gravitate to zero with constant regulation of TBN oil number, fuel is better purified, emulsion of the fuel and water is injected into the cylinder, SCR catalytic exhaust gas reduction is developed, hybrid dual fuel engine is developed and finally today’s different engines are called intelligent. That type of engine is capable to analyse, anticipate and resolve the problem in real time without human influence