大型二冲程船用柴油机高压SCR系统在恶劣天气条件下的运行

IF 1.3 4区 工程技术 Q3 ENGINEERING, CIVIL
Michael I. Foteinos, George I. Christofilis, N. Kyrtatos
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引用次数: 1

摘要

通过仿真研究了直接驱动大型二冲程船用柴油机在恶劣天气条件下的瞬态性能。该船的主机配备了选择性催化还原(SCR)后处理系统,以符合最新的国际海事组织(IMO)氮氧化物减少规则,IMO Tier III。由于SCR系统进口排气温度的限制和船用柴油机产生的低温废气,在船舶应用中,SCR系统安装在涡轮的高压侧。当船舶在恶劣天气中航行时,它会经历阻力增加,波浪引起的运动,以及由船舶运动引起的螺旋桨中的时变流场。这将导致螺旋桨扭矩需求的波动,从而导致发动机功率和排气温度的波动,从而影响发动机和SCR的性能。为了研究这一现象并考虑发动机-螺旋桨的相互作用,对整个推进装置进行了建模,即低速柴油机推进发动机、高压SCR系统、直驱螺旋桨和船体。为了模拟螺旋桨瞬态转矩需求,采用了考虑船舶运动引起的转矩变化的螺旋桨模型。利用三维面板代码计算了规则波和不规则波下船舶在波浪中的运动和波浪附加阻力。结合某船载推进系统在良好天气条件下的实测数据,对该耦合模型进行了验证。该模型随后被用于模拟三级船舶推进装置在规则波和不规则波存在下从低负荷到中负荷加速过程中的行为。研究了时变螺旋桨需求对发动机和SCR系统的影响。1. 波浪对船舶推进系统的影响是一个复杂的现象,涉及推进装置的不同子系统,即原动机、螺旋桨和船体之间的相互作用。在恶劣天气条件下航行的船只会经历阻力增加、波浪引起的运动和螺旋桨中的时变流场。这导致螺旋桨扭矩需求的波动,从而导致发动机产生的功率和排气温度的波动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Large Two-Stroke Marine Diesel Engine Operation with a High-Pressure SCR System in Heavy Weather Conditions
The transient performance of a direct-drive large two-stroke marine diesel engine, installed in a vessel operating in a seaway with heavy weather, is investigated via simulation. The main engine of the ship is equipped with a selective catalytic reduction (SCR) after treatment system for compliance with the latest International Maritime Organization (IMO) rules for NOx reduction, IMO Tier III. Because of limitations of exhaust gas temperature at the inlet of SCR systems and the low temperature exhaust gases produced by marine diesel engines, in marine applications, the SCR system is installed on the high-pressure side of the turbine. When a ship sails in heavy weather, it experiences a resistance increase, wave-induced motions, and a time-varying flow field in the propeller, induced by ship motions. This results in a fluctuation of the propeller torque demand and, thus, a fluctuation in engine power and exhaust gas temperature, which can affect engine and SCR performance. To investigate this phenomenon and take into account the engine–propeller interaction, the entire propulsion plant was modeled, namely, the slow-speed diesel propulsion engine, the high-pressure SCR system, the directly driven propeller, and the ship's hull. To simulate the transient propeller torque demand, a propeller model was used, and torque variations due to ship motions were taken into account. Ship motions in waves and wave-added resistance were calculated for regular and irregular waves using a 3D panel code. The coupled model was validated against available measured data from a shipboard propulsion system in good weather conditions. The model was then used to simulate the behavior of a Tier III marine propulsion plant during acceleration from low to medium load, in the presence of regular and irregular waves. The effect of the time-varying propeller demand on the engine and the SCR system was investigated. 1. Introduction The effect of waves on a marine propulsion system is a complex phenomenon involving interactions between different subsystems of the propulsion plant, i.e., the prime mover, the propeller, and the ship's hull. Ships sailing in heavy weather conditions experience a resistance increase, wave-induced motions, and a time-varying flow field in the propeller. This leads to a fluctuation of the propeller torque demand which results in a fluctuation in engine-produced power and exhaust gas temperature.
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来源期刊
Journal of Ship Research
Journal of Ship Research 工程技术-工程:海洋
CiteScore
2.80
自引率
0.00%
发文量
12
审稿时长
6 months
期刊介绍: Original and Timely technical papers addressing problems of shipyard techniques and production of merchant and naval ships appear in this quarterly publication. Since its inception, the Journal of Ship Production and Design (formerly the Journal of Ship Production) has been a forum for peer-reviewed, professionally edited papers from academic and industry sources. As such, it has influenced the worldwide development of ship production engineering as a fully qualified professional discipline. The expanded scope seeks papers in additional areas, specifically ship design, including design for production, plus other marine technology topics, such as ship operations, shipping economic, and safety. Each issue contains a well-rounded selection of technical papers relevant to marine professionals.
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