The combustion emissions of the hydrogen-fueled engines are very clean, but problems abnormal and high NOx limit their applications. Nowadays hydrogen use exhaust gas recirculation (EGR) technology to control intensity premixed reduce emissions. This study aims at improving decreasing engine by applying a three-dimensional (3D) computational fluid dynamics (CFD) model single-cylinder equipped with an EGR system. results indicated that peak in-cylinder pressure continuously increased increase...

A self-designed continuous-flow ultrasound/ultraviolet (US/UV) baffled reactor was tested in this work, and the disinfection efficiency of secondary effluent from a wastewater treatment plant (WWTP) investigated terms different locations ultrasonic transducers inside under similar input power densities specific energy consumptions. Results demonstrated that two-stage simultaneous US/UV irradiation both chambers 2 3 at flow rate 1200 L/h performed excellent efficiency. It achieved an average...

With increasing environmental pollution from ship exhaust emissions and increasingly stringent International Maritime Organization carbon regulations, there is a growing demand for cleaner lower-carbon fuels near-zero-emission marine engines worldwide. Liquefied natural gas low-carbon fuel, when liquefied (LNG) used on ships, dual-fuel methods are often used. The pre-chamber plays key role in the working process of engines. In this paper, an effective three-dimensional simulation model based...

In recent years and with the increasing rigor of International Maritime Organization (IMO) emission regulations, shipping industry has focused more on environment-friendly efficient power. Low-pressure dual-fuel (LP-DF) engine technology high efficiency good emissions become a promising solution in development marine engines. This often uses pre-combustion chamber (PCC) to ignite natural gas due its higher ignition energy. this paper, parametric study LP-DF was proceeded investigate design...

The global demand for clean fuels is increasing in order to meet the requirements of International Maritime Organization (IMO) 0.5% Sulphur cap and Tier III emission limits. Natural gas has begun be popularized on liquefied natural (LNG) ships because its low cost environment friendly. In large-bore marine engines, ignition with pilot fuel prechamber a good way reduce combustion variability extend lean-burn limit. However, occurrence knock limits increase power. Therefore, this paper...

According to regulations from the International Maritime Organization (IMO), sulfur content of vessels must not exceed 0.5% outside Emission Control Areas (ECAs) starting 2020. The marine exhaust gas desulfurization (De-SOx) system is most feasible technology meet increasing regulations, but there always a large swirl at bottom scrubber causing uneven flow past sprays. Solving this problem by adjusting spray method. 485 K and injection liquid 305 are simulated optimize field in De-SOx...

In addition to the use of waste heat from vessel’s exhaust gas save energy onboard, reduce carbon emissions ship, and combine characteristics ship heat, mathematical modeling testing temperature difference power generation were carried out in this study. Finally, an experimental platform for differential was established assess impact influencing agents on efficiency generation. The results show that effect different thermally conductive greases tablets is basically same. addition, rate flow...

Abstract To understand the effect of deposit in combustion chamber on engine-out hydrocarbon emissions, a two-zone model which predicts emissions contributed from deposits is presented and test one cylinder spark ignition engine used to accumulate deposit. The experiments are conducted under various operating conditions presence deposits. can successfully predict hydrocarbons conditions. experimental results show that there exists an equilibrium thickness if operates for certain period time....

In order to cut down carbon dioxide emission from shipping industries, ammonia is proposed as an alternative marine fuel oil recently. The applicability of firstly analyzed in this paper the aspects reduction potential, maturity system, infrastructure, and economy. It proved shows that one best fuels for ships long term. To understand feasibility a clean future, three-dimensional combustion model diesel engine 4135Aca was established by Solid Works software CONVERGE software. simulation...

In order to investigate the effect of different influencing factors on application temperature differential power generation in ship exhaust gas and explore potential waste heat recovery utilization during travel, an experimental system based marine environment was established. The maximum output efficiency each temperature-difference module were theoretically calculated. results showed that insulation material salt water (seawater) had little modules. Conversely, installation pressure,...

Compared to conventional mesophilic anaerobic digestion, thermophilic digestion may offer attractive advantages such as higher volatile solid destruction efficiency, biogas generation, and disinfection effect better dewater ability. In this study, two experiments of waste activated sludge were conducted evaluate the influence total inoculums ratio on production (55±1°C) process stability. first experiment, 4 reactors with concentration 6%, 8%, 10% 12% respectively was observed. The...

The emission requirements of ships in the control zone must meet Tier III standards. low-pressure dual-fuel engine adopts mid-cylinder premixed intake air and double pre-combustion chambers (PCC) structure, which can achieve high efficiency combustion. In this paper, an effective 3D simulation model is established for a marine engine. effects structure pre-chamber on performance are investigated from angle channel. channel affects direction flame propagation. Different propagation directions...

With the increasingly serious environmental impact of marine exhaust emissions and stringent IMO emission standards, global demand for clean fuels is increasing. In this paper, an effective 3D simulation model established structural characteristics a low-pressure dual-fuel engine. The effects pre-chamber structure on engine performance are explored from aspects channel diameter. diameter affects propagation flame jet in combustion chamber. proper beneficial to improve stability propagation,...

In order to study the influencing factors of application temperature difference in ship’s exhaust gas and explore potential recycling waste heat from gas, an experimental system for power generation has been designed. Besides, related performance studies have carried out about characteristics tablets gas. Moreover, theoretical calculation maximum output efficiency individual differential module was out. Furthermore, effects insulation material, installation pressure, thermally conductive...