基于SOFC-GT的长江流域货船推进系统特性分析

Characteristics Analysis of Cargo Ship Propulsion System Based on SOFC-GT in Yangtze River Basin

为了探索柴油燃料在船舶航运中的清洁化利用的新路径,建立基于固体氧化物燃料电池-燃气轮机(SOFC-GT)混合动力系统的船舶推进系统,结合柴油的裂解和重整以及各部件安全运行边界约束,研究工作参数对混合动力系统性能的影响,得到不同航道水流速、风速以及航行速度下混合动力系统运行规律。结果表明:在额定工况下,该船舶SOFC-GT推进系统功率为2458k W,燃料消耗为0.092 kg/s,效率可达56.33%。采用阳极再循环可将系统的效率提高9.91%,但为了避免SOFC工作温度过高,再循环比不能超过0.45。燃空比和水碳比的安全调节范围分别为0.0295~0.0677和1.6~3.5,SOFC-GT系统在安全区域内功率的上下限分别为460.6 kW~1 229.0 kW和1 007.0 kW~1 178.0 kW,取得上下限时的系统效率分别为49.09%~56.41%和47.69%~56.82%,可以实现宽工况调节。货船SOFC-GT推进系统相比传统柴油机,在长江流域不同水流速度、风速和航行速度下,展现出更高的效率和续航能力,效率提升可达15.5%。

In order to explore a new path for the clean utilization of diesel fuel in ship transportation,a ship propulsion system based on solid oxide fuel cell-gas turbine(SOFC-GT)hybrid power system is established.The effects of fuel air ratio,recirculation ratio,steam to carbon ratio and other parameters on the performance of the hybrid power system are studied in combination with the cracking and reforming of diesel and the safe operating boundary constraints of each component.The results show that the power of the SOFC-GT propulsion system is 2458 kW,the fuel consumption is 0.092 kg/s,and the efficiency can reach 56.33%under rated working conditions.The anode recirculation can increase the efficiency of the system by 9.91%,but in order to avoid the SOFC operating temperature is too high,the recirculation ratio cannot exceed 0.45;when the change range of F/A ratio is 0.0295-0.0677,the change range of system power and efficiency is 460.6 kW-229.0 kW and 49.09%-56.41%,which can realize wide operating condition adjustment.The safe,adjustment range of water carbon ratio is 1.6-3.5,and the system power range and efficiency range are 1007.0 kW-1178.0 kW and 47.69%-56.82%,respectively.Compared with the traditional diesel engine,the cargo ship SOFC-GT propulsion system shows higher efficiency and endurance under different water speeds,wind speeds and sailing speeds in the Yangtze River basin,with a maximum increase of 15.5%.