Influence of the Indicator Channel and Indicator Valve on the Heat Release Characteristics of Medium Speed Marine Diesel Engines

Polanowski, S.; Pawletko, R.; Witkowski, Kazimierz

doi:10.4028/www.scientific.net/kem.588.149

Cited by 2 publications

(2 citation statements)

References 1 publication

(3 reference statements)

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“…This pressure transducer is connected to the bleed valve, located at the engine head, which acts as an indicator channel. It worth mentioning that the experimental pressure trace can be distorted due to pressure waves in the channel [36], and that no algorithm was applied to correct this drawback. Other experimental data at different loads are indicated in Table 1.…”

Section: Description Of the Engine Analyzedmentioning

confidence: 99%

Numerical Analysis of NOx Reduction Using Ammonia Injection and Comparison with Water Injection

Galdo

Castro-Santos

Vidal³

2020

JMSE

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This work analyzes NO x reduction in a marine diesel engine using ammonia injection directly into the cylinder and compares this procedure with water injection. A numerical model based on the so-called inert species method was applied. It was verified that ammonia injection can provide almost 80% NO x reduction for the conditions analyzed. Furthermore, it was found that the effectiveness of the chemical effect using ammonia is extremely dependent on the injection timing. The optimum NO x reduction was obtained when ammonia is injected during the expansion stroke, while the optimum injection timing using water is near top dead center. Chemical, thermal, and dilution effects of both ammonia and water injection were compared. The chemical effect was dominant in the case of ammonia injection. On the other hand, water injection reduces NO x through dilution and, more significantly, through a thermal effect.that the main factors that influence NO x formation are the temperatures reached in the combustion process and the amount of time in which the combustion gases remain at high temperatures [5][6][7]. Based on this, primary measures focus on addressing these factors and reducing the concentrations of oxygen and nitrogen [8,9]. Well-known primary measures are exhaust gas recirculation (EGR), Miller timing, common rail, modification of injection and other parameters of the engine, and water addition. Water can be introduced as a fuel-water emulsion injected via the fuel valve, through separate nozzles or by humidifying the scavenge air. Despite the extensive research on primary measures along the recent years, a procedure to reduce NO x without decreasing emission of other pollutants and/or consumption has not effectively been developed. In this regard, secondary measures reduce NO x from the flue gas through downstream cleaning techniques. Many applications have been undertaken to reduce NO x by selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). The disadvantages of SCR are its price, poor durability of catalysts, and deposition of particulate on the catalyst. These disadvantages are not present in SNCR, but this procedure is limited to a narrow temperature range with optimal temperatures that are much higher than those characteristic of flue gas from diesel engines [10]. This limitation constitutes a drawback for practical applications in exhaust gases from diesel engines. As SCR reducing agents, ammonia (NH 3 ), urea, and cyanuric acid have been extensively employed. SNCR using ammonia, urea, and cyanuric acid are known as DeNO x [11,12], NO x OUT [13,14], and RAPRENO [15-17], respectively. Between these, this work focuses on NO x reduction using ammonia. The NO x reduction capabilities of ammonia were discovered in the seventies by Lyon [18], who found that ammonia selectively reduces NO x without a catalyst over the temperature range of 1100-1400 K. Typical exhaust gas temperatures from marine engines, around 300-450 • C [19], remain considerably lower than this optimal temperature ra...

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Section: Description Of the Engine Analyzedmentioning

confidence: 99%

Numerical Analysis of NOx Reduction Using Ammonia Injection and Comparison with Water Injection

Galdo

Castro-Santos

Vidal³

2020

JMSE

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“…The auxiliary engines drive electric generators acting together with dieselgenerator (ZSE). Most of them they are not equipped with indicator valves, especially auxiliary engines [1,2]. This is the main reason for using the TBO hourly strategy relative to this engines.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modelling malfunctions of marine diesel engine

Zacharewicz

2017

MATEC Web Conf.

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Abstract. The paper describes modelling methods of selected malfunctions in a four-stroke marine diesel engine. The model has been developed for purposes to assess methods of technical conditions selected elements of the engine structure. Modelling malfunctions allow to determine answers to energetic parameters of the faults. The paper is based on earlier publications, in which was carried out studies of the physical model of energetic processes in engine and additionally the mathematical model which was based on the developed physical model.

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Influence of the Indicator Channel and Indicator Valve on the Heat Release Characteristics of Medium Speed Marine Diesel Engines

Cited by 2 publications

References 1 publication

Numerical Analysis of NOx Reduction Using Ammonia Injection and Comparison with Water Injection

Numerical Analysis of NOx Reduction Using Ammonia Injection and Comparison with Water Injection

Mathematical modelling malfunctions of marine diesel engine

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