Biogas production to improve heavy fuel performance by re-using the sewage on ships.

The number of ships is increasing day by day which require more fuel and produce more emissions. In addition, petroleum resources are limited in nature and emission standards are being tightened day by day. The IMO has set the target to reduce ships' CO2 emissions by at least 40% by 2030 compared to the levels produced in 2008. In order to minimize greenhouse gas emissions from ships, EEXI and CII, a series of changes to current laws, have been accepted by IMO. The classification organization has consequently set out to establish emission caps, use EEXI calculation criteria, and mandate that ships implement the essential requirements to comply. Those scenarios are motivating the researcher to find a non-petroleum clean energy source, in order to achieve the aforementioned goal, gaseous fuel replenishment is beneficial. In this study, methane gas supplementation has been done to diesel engine. The investigation was carried out to analyze the performance and emission of diesel engine using 0–75% substitution of diesel indicated power by methane energy in dual fuel mode at varying load (25%, 50%, 75%, and 100%). The results demonstrate that methane energy sharing (MES) lowers brake thermal efficiency (BTE) while unaccounted heat loss increases. For the purpose of determining the non-thermal impact of CH4 on HOx emissions, a comparison of NO and NO2 emissions has been given below. Combined reduction in nitrogen oxide and soot emission makes the outcomes of this study more suitable to implement for achieving the strict emission norms. Therefore, CH4 augmentation is advantageous in mid- and high-load circumstances with reduced emissions and energy consumption. [ABSTRACT FROM AUTHOR]